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android13/external/icu/icu4c/source/i18n/rematch.cpp

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**************************************************************************
* Copyright (C) 2002-2016 International Business Machines Corporation
* and others. All rights reserved.
**************************************************************************
*/
//
// file: rematch.cpp
//
// Contains the implementation of class RegexMatcher,
// which is one of the main API classes for the ICU regular expression package.
//
#include "unicode/utypes.h"
#if !UCONFIG_NO_REGULAR_EXPRESSIONS
#include "unicode/regex.h"
#include "unicode/uniset.h"
#include "unicode/uchar.h"
#include "unicode/ustring.h"
#include "unicode/rbbi.h"
#include "unicode/utf.h"
#include "unicode/utf16.h"
#include "uassert.h"
#include "cmemory.h"
#include "cstr.h"
#include "uvector.h"
#include "uvectr32.h"
#include "uvectr64.h"
#include "regeximp.h"
#include "regexst.h"
#include "regextxt.h"
#include "ucase.h"
// #include <malloc.h> // Needed for heapcheck testing
U_NAMESPACE_BEGIN
// Default limit for the size of the back track stack, to avoid system
// failures causedby heap exhaustion. Units are in 32 bit words, not bytes.
// This value puts ICU's limits higher than most other regexp implementations,
// which use recursion rather than the heap, and take more storage per
// backtrack point.
//
static const int32_t DEFAULT_BACKTRACK_STACK_CAPACITY = 8000000;
// Time limit counter constant.
// Time limits for expression evaluation are in terms of quanta of work by
// the engine, each of which is 10,000 state saves.
// This constant determines that state saves per tick number.
static const int32_t TIMER_INITIAL_VALUE = 10000;
// Test for any of the Unicode line terminating characters.
static inline UBool isLineTerminator(UChar32 c) {
if (c & ~(0x0a | 0x0b | 0x0c | 0x0d | 0x85 | 0x2028 | 0x2029)) {
return false;
}
return (c<=0x0d && c>=0x0a) || c==0x85 || c==0x2028 || c==0x2029;
}
//-----------------------------------------------------------------------------
//
// Constructor and Destructor
//
//-----------------------------------------------------------------------------
RegexMatcher::RegexMatcher(const RegexPattern *pat) {
fDeferredStatus = U_ZERO_ERROR;
init(fDeferredStatus);
if (U_FAILURE(fDeferredStatus)) {
return;
}
if (pat==NULL) {
fDeferredStatus = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
fPattern = pat;
init2(RegexStaticSets::gStaticSets->fEmptyText, fDeferredStatus);
}
RegexMatcher::RegexMatcher(const UnicodeString &regexp, const UnicodeString &input,
uint32_t flags, UErrorCode &status) {
init(status);
if (U_FAILURE(status)) {
return;
}
UParseError pe;
fPatternOwned = RegexPattern::compile(regexp, flags, pe, status);
fPattern = fPatternOwned;
UText inputText = UTEXT_INITIALIZER;
utext_openConstUnicodeString(&inputText, &input, &status);
init2(&inputText, status);
utext_close(&inputText);
fInputUniStrMaybeMutable = TRUE;
}
RegexMatcher::RegexMatcher(UText *regexp, UText *input,
uint32_t flags, UErrorCode &status) {
init(status);
if (U_FAILURE(status)) {
return;
}
UParseError pe;
fPatternOwned = RegexPattern::compile(regexp, flags, pe, status);
if (U_FAILURE(status)) {
return;
}
fPattern = fPatternOwned;
init2(input, status);
}
RegexMatcher::RegexMatcher(const UnicodeString &regexp,
uint32_t flags, UErrorCode &status) {
init(status);
if (U_FAILURE(status)) {
return;
}
UParseError pe;
fPatternOwned = RegexPattern::compile(regexp, flags, pe, status);
if (U_FAILURE(status)) {
return;
}
fPattern = fPatternOwned;
init2(RegexStaticSets::gStaticSets->fEmptyText, status);
}
RegexMatcher::RegexMatcher(UText *regexp,
uint32_t flags, UErrorCode &status) {
init(status);
if (U_FAILURE(status)) {
return;
}
UParseError pe;
fPatternOwned = RegexPattern::compile(regexp, flags, pe, status);
if (U_FAILURE(status)) {
return;
}
fPattern = fPatternOwned;
init2(RegexStaticSets::gStaticSets->fEmptyText, status);
}
RegexMatcher::~RegexMatcher() {
delete fStack;
if (fData != fSmallData) {
uprv_free(fData);
fData = NULL;
}
if (fPatternOwned) {
delete fPatternOwned;
fPatternOwned = NULL;
fPattern = NULL;
}
if (fInput) {
delete fInput;
}
if (fInputText) {
utext_close(fInputText);
}
if (fAltInputText) {
utext_close(fAltInputText);
}
#if UCONFIG_NO_BREAK_ITERATION==0
delete fWordBreakItr;
delete fGCBreakItr;
#endif
}
//
// init() common initialization for use by all constructors.
// Initialize all fields, get the object into a consistent state.
// This must be done even when the initial status shows an error,
// so that the object is initialized sufficiently well for the destructor
// to run safely.
//
void RegexMatcher::init(UErrorCode &status) {
fPattern = NULL;
fPatternOwned = NULL;
fFrameSize = 0;
fRegionStart = 0;
fRegionLimit = 0;
fAnchorStart = 0;
fAnchorLimit = 0;
fLookStart = 0;
fLookLimit = 0;
fActiveStart = 0;
fActiveLimit = 0;
fTransparentBounds = FALSE;
fAnchoringBounds = TRUE;
fMatch = FALSE;
fMatchStart = 0;
fMatchEnd = 0;
fLastMatchEnd = -1;
fAppendPosition = 0;
fHitEnd = FALSE;
fRequireEnd = FALSE;
fStack = NULL;
fFrame = NULL;
fTimeLimit = 0;
fTime = 0;
fTickCounter = 0;
fStackLimit = DEFAULT_BACKTRACK_STACK_CAPACITY;
fCallbackFn = NULL;
fCallbackContext = NULL;
fFindProgressCallbackFn = NULL;
fFindProgressCallbackContext = NULL;
fTraceDebug = FALSE;
fDeferredStatus = status;
fData = fSmallData;
fWordBreakItr = NULL;
fGCBreakItr = NULL;
fStack = NULL;
fInputText = NULL;
fAltInputText = NULL;
fInput = NULL;
fInputLength = 0;
fInputUniStrMaybeMutable = FALSE;
}
//
// init2() Common initialization for use by RegexMatcher constructors, part 2.
// This handles the common setup to be done after the Pattern is available.
//
void RegexMatcher::init2(UText *input, UErrorCode &status) {
if (U_FAILURE(status)) {
fDeferredStatus = status;
return;
}
if (fPattern->fDataSize > UPRV_LENGTHOF(fSmallData)) {
fData = (int64_t *)uprv_malloc(fPattern->fDataSize * sizeof(int64_t));
if (fData == NULL) {
status = fDeferredStatus = U_MEMORY_ALLOCATION_ERROR;
return;
}
}
fStack = new UVector64(status);
if (fStack == NULL) {
status = fDeferredStatus = U_MEMORY_ALLOCATION_ERROR;
return;
}
reset(input);
setStackLimit(DEFAULT_BACKTRACK_STACK_CAPACITY, status);
if (U_FAILURE(status)) {
fDeferredStatus = status;
return;
}
}
static const UChar BACKSLASH = 0x5c;
static const UChar DOLLARSIGN = 0x24;
static const UChar LEFTBRACKET = 0x7b;
static const UChar RIGHTBRACKET = 0x7d;
//--------------------------------------------------------------------------------
//
// appendReplacement
//
//--------------------------------------------------------------------------------
RegexMatcher &RegexMatcher::appendReplacement(UnicodeString &dest,
const UnicodeString &replacement,
UErrorCode &status) {
UText replacementText = UTEXT_INITIALIZER;
utext_openConstUnicodeString(&replacementText, &replacement, &status);
if (U_SUCCESS(status)) {
UText resultText = UTEXT_INITIALIZER;
utext_openUnicodeString(&resultText, &dest, &status);
if (U_SUCCESS(status)) {
appendReplacement(&resultText, &replacementText, status);
utext_close(&resultText);
}
utext_close(&replacementText);
}
return *this;
}
//
// appendReplacement, UText mode
//
RegexMatcher &RegexMatcher::appendReplacement(UText *dest,
UText *replacement,
UErrorCode &status) {
if (U_FAILURE(status)) {
return *this;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return *this;
}
if (fMatch == FALSE) {
status = U_REGEX_INVALID_STATE;
return *this;
}
// Copy input string from the end of previous match to start of current match
int64_t destLen = utext_nativeLength(dest);
if (fMatchStart > fAppendPosition) {
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
destLen += utext_replace(dest, destLen, destLen, fInputText->chunkContents+fAppendPosition,
(int32_t)(fMatchStart-fAppendPosition), &status);
} else {
int32_t len16;
if (UTEXT_USES_U16(fInputText)) {
len16 = (int32_t)(fMatchStart-fAppendPosition);
} else {
UErrorCode lengthStatus = U_ZERO_ERROR;
len16 = utext_extract(fInputText, fAppendPosition, fMatchStart, NULL, 0, &lengthStatus);
}
UChar *inputChars = (UChar *)uprv_malloc(sizeof(UChar)*(len16+1));
if (inputChars == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return *this;
}
utext_extract(fInputText, fAppendPosition, fMatchStart, inputChars, len16+1, &status);
destLen += utext_replace(dest, destLen, destLen, inputChars, len16, &status);
uprv_free(inputChars);
}
}
fAppendPosition = fMatchEnd;
// scan the replacement text, looking for substitutions ($n) and \escapes.
// TODO: optimize this loop by efficiently scanning for '$' or '\',
// move entire ranges not containing substitutions.
UTEXT_SETNATIVEINDEX(replacement, 0);
for (UChar32 c = UTEXT_NEXT32(replacement); U_SUCCESS(status) && c != U_SENTINEL; c = UTEXT_NEXT32(replacement)) {
if (c == BACKSLASH) {
// Backslash Escape. Copy the following char out without further checks.
// Note: Surrogate pairs don't need any special handling
// The second half wont be a '$' or a '\', and
// will move to the dest normally on the next
// loop iteration.
c = UTEXT_CURRENT32(replacement);
if (c == U_SENTINEL) {
break;
}
if (c==0x55/*U*/ || c==0x75/*u*/) {
// We have a \udddd or \Udddddddd escape sequence.
int32_t offset = 0;
struct URegexUTextUnescapeCharContext context = U_REGEX_UTEXT_UNESCAPE_CONTEXT(replacement);
UChar32 escapedChar = u_unescapeAt(uregex_utext_unescape_charAt, &offset, INT32_MAX, &context);
if (escapedChar != (UChar32)0xFFFFFFFF) {
if (U_IS_BMP(escapedChar)) {
UChar c16 = (UChar)escapedChar;
destLen += utext_replace(dest, destLen, destLen, &c16, 1, &status);
} else {
UChar surrogate[2];
surrogate[0] = U16_LEAD(escapedChar);
surrogate[1] = U16_TRAIL(escapedChar);
if (U_SUCCESS(status)) {
destLen += utext_replace(dest, destLen, destLen, surrogate, 2, &status);
}
}
// TODO: Report errors for mal-formed \u escapes?
// As this is, the original sequence is output, which may be OK.
if (context.lastOffset == offset) {
(void)UTEXT_PREVIOUS32(replacement);
} else if (context.lastOffset != offset-1) {
utext_moveIndex32(replacement, offset - context.lastOffset - 1);
}
}
} else {
(void)UTEXT_NEXT32(replacement);
// Plain backslash escape. Just put out the escaped character.
if (U_IS_BMP(c)) {
UChar c16 = (UChar)c;
destLen += utext_replace(dest, destLen, destLen, &c16, 1, &status);
} else {
UChar surrogate[2];
surrogate[0] = U16_LEAD(c);
surrogate[1] = U16_TRAIL(c);
if (U_SUCCESS(status)) {
destLen += utext_replace(dest, destLen, destLen, surrogate, 2, &status);
}
}
}
} else if (c != DOLLARSIGN) {
// Normal char, not a $. Copy it out without further checks.
if (U_IS_BMP(c)) {
UChar c16 = (UChar)c;
destLen += utext_replace(dest, destLen, destLen, &c16, 1, &status);
} else {
UChar surrogate[2];
surrogate[0] = U16_LEAD(c);
surrogate[1] = U16_TRAIL(c);
if (U_SUCCESS(status)) {
destLen += utext_replace(dest, destLen, destLen, surrogate, 2, &status);
}
}
} else {
// We've got a $. Pick up a capture group name or number if one follows.
// Consume digits so long as the resulting group number <= the number of
// number of capture groups in the pattern.
int32_t groupNum = 0;
int32_t numDigits = 0;
UChar32 nextChar = utext_current32(replacement);
if (nextChar == LEFTBRACKET) {
// Scan for a Named Capture Group, ${name}.
UnicodeString groupName;
utext_next32(replacement);
while(U_SUCCESS(status) && nextChar != RIGHTBRACKET) {
nextChar = utext_next32(replacement);
if (nextChar == U_SENTINEL) {
status = U_REGEX_INVALID_CAPTURE_GROUP_NAME;
} else if ((nextChar >= 0x41 && nextChar <= 0x5a) || // A..Z
(nextChar >= 0x61 && nextChar <= 0x7a) || // a..z
(nextChar >= 0x31 && nextChar <= 0x39)) { // 0..9
groupName.append(nextChar);
} else if (nextChar == RIGHTBRACKET) {
groupNum = fPattern->fNamedCaptureMap ? uhash_geti(fPattern->fNamedCaptureMap, &groupName) : 0;
if (groupNum == 0) {
status = U_REGEX_INVALID_CAPTURE_GROUP_NAME;
}
} else {
// Character was something other than a name char or a closing '}'
status = U_REGEX_INVALID_CAPTURE_GROUP_NAME;
}
}
} else if (u_isdigit(nextChar)) {
// $n Scan for a capture group number
int32_t numCaptureGroups = fPattern->fGroupMap->size();
for (;;) {
nextChar = UTEXT_CURRENT32(replacement);
if (nextChar == U_SENTINEL) {
break;
}
if (u_isdigit(nextChar) == FALSE) {
break;
}
int32_t nextDigitVal = u_charDigitValue(nextChar);
if (groupNum*10 + nextDigitVal > numCaptureGroups) {
// Don't consume the next digit if it makes the capture group number too big.
if (numDigits == 0) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
}
break;
}
(void)UTEXT_NEXT32(replacement);
groupNum=groupNum*10 + nextDigitVal;
++numDigits;
}
} else {
// $ not followed by capture group name or number.
status = U_REGEX_INVALID_CAPTURE_GROUP_NAME;
}
if (U_SUCCESS(status)) {
destLen += appendGroup(groupNum, dest, status);
}
} // End of $ capture group handling
} // End of per-character loop through the replacement string.
return *this;
}
//--------------------------------------------------------------------------------
//
// appendTail Intended to be used in conjunction with appendReplacement()
// To the destination string, append everything following
// the last match position from the input string.
//
// Note: Match ranges do not affect appendTail or appendReplacement
//
//--------------------------------------------------------------------------------
UnicodeString &RegexMatcher::appendTail(UnicodeString &dest) {
UErrorCode status = U_ZERO_ERROR;
UText resultText = UTEXT_INITIALIZER;
utext_openUnicodeString(&resultText, &dest, &status);
if (U_SUCCESS(status)) {
appendTail(&resultText, status);
utext_close(&resultText);
}
return dest;
}
//
// appendTail, UText mode
//
UText *RegexMatcher::appendTail(UText *dest, UErrorCode &status) {
if (U_FAILURE(status)) {
return dest;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return dest;
}
if (fInputLength > fAppendPosition) {
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
int64_t destLen = utext_nativeLength(dest);
utext_replace(dest, destLen, destLen, fInputText->chunkContents+fAppendPosition,
(int32_t)(fInputLength-fAppendPosition), &status);
} else {
int32_t len16;
if (UTEXT_USES_U16(fInputText)) {
len16 = (int32_t)(fInputLength-fAppendPosition);
} else {
len16 = utext_extract(fInputText, fAppendPosition, fInputLength, NULL, 0, &status);
status = U_ZERO_ERROR; // buffer overflow
}
UChar *inputChars = (UChar *)uprv_malloc(sizeof(UChar)*(len16));
if (inputChars == NULL) {
fDeferredStatus = U_MEMORY_ALLOCATION_ERROR;
} else {
utext_extract(fInputText, fAppendPosition, fInputLength, inputChars, len16, &status); // unterminated
int64_t destLen = utext_nativeLength(dest);
utext_replace(dest, destLen, destLen, inputChars, len16, &status);
uprv_free(inputChars);
}
}
}
return dest;
}
//--------------------------------------------------------------------------------
//
// end
//
//--------------------------------------------------------------------------------
int32_t RegexMatcher::end(UErrorCode &err) const {
return end(0, err);
}
int64_t RegexMatcher::end64(UErrorCode &err) const {
return end64(0, err);
}
int64_t RegexMatcher::end64(int32_t group, UErrorCode &err) const {
if (U_FAILURE(err)) {
return -1;
}
if (fMatch == FALSE) {
err = U_REGEX_INVALID_STATE;
return -1;
}
if (group < 0 || group > fPattern->fGroupMap->size()) {
err = U_INDEX_OUTOFBOUNDS_ERROR;
return -1;
}
int64_t e = -1;
if (group == 0) {
e = fMatchEnd;
} else {
// Get the position within the stack frame of the variables for
// this capture group.
int32_t groupOffset = fPattern->fGroupMap->elementAti(group-1);
U_ASSERT(groupOffset < fPattern->fFrameSize);
U_ASSERT(groupOffset >= 0);
e = fFrame->fExtra[groupOffset + 1];
}
return e;
}
int32_t RegexMatcher::end(int32_t group, UErrorCode &err) const {
return (int32_t)end64(group, err);
}
//--------------------------------------------------------------------------------
//
// findProgressInterrupt This function is called once for each advance in the target
// string from the find() function, and calls the user progress callback
// function if there is one installed.
//
// Return: TRUE if the find operation is to be terminated.
// FALSE if the find operation is to continue running.
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::findProgressInterrupt(int64_t pos, UErrorCode &status) {
if (fFindProgressCallbackFn && !(*fFindProgressCallbackFn)(fFindProgressCallbackContext, pos)) {
status = U_REGEX_STOPPED_BY_CALLER;
return TRUE;
}
return FALSE;
}
//--------------------------------------------------------------------------------
//
// find()
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::find() {
if (U_FAILURE(fDeferredStatus)) {
return FALSE;
}
UErrorCode status = U_ZERO_ERROR;
UBool result = find(status);
return result;
}
//--------------------------------------------------------------------------------
//
// find()
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::find(UErrorCode &status) {
// Start at the position of the last match end. (Will be zero if the
// matcher has been reset.)
//
if (U_FAILURE(status)) {
return FALSE;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return FALSE;
}
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
return findUsingChunk(status);
}
int64_t startPos = fMatchEnd;
if (startPos==0) {
startPos = fActiveStart;
}
if (fMatch) {
// Save the position of any previous successful match.
fLastMatchEnd = fMatchEnd;
if (fMatchStart == fMatchEnd) {
// Previous match had zero length. Move start position up one position
// to avoid sending find() into a loop on zero-length matches.
if (startPos >= fActiveLimit) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
UTEXT_SETNATIVEINDEX(fInputText, startPos);
(void)UTEXT_NEXT32(fInputText);
startPos = UTEXT_GETNATIVEINDEX(fInputText);
}
} else {
if (fLastMatchEnd >= 0) {
// A previous find() failed to match. Don't try again.
// (without this test, a pattern with a zero-length match
// could match again at the end of an input string.)
fHitEnd = TRUE;
return FALSE;
}
}
// Compute the position in the input string beyond which a match can not begin, because
// the minimum length match would extend past the end of the input.
// Note: some patterns that cannot match anything will have fMinMatchLength==Max Int.
// Be aware of possible overflows if making changes here.
int64_t testStartLimit;
if (UTEXT_USES_U16(fInputText)) {
testStartLimit = fActiveLimit - fPattern->fMinMatchLen;
if (startPos > testStartLimit) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
} else {
// We don't know exactly how long the minimum match length is in native characters.
// Treat anything > 0 as 1.
testStartLimit = fActiveLimit - (fPattern->fMinMatchLen > 0 ? 1 : 0);
}
UChar32 c;
U_ASSERT(startPos >= 0);
switch (fPattern->fStartType) {
case START_NO_INFO:
// No optimization was found.
// Try a match at each input position.
for (;;) {
MatchAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
if (startPos >= testStartLimit) {
fHitEnd = TRUE;
return FALSE;
}
UTEXT_SETNATIVEINDEX(fInputText, startPos);
(void)UTEXT_NEXT32(fInputText);
startPos = UTEXT_GETNATIVEINDEX(fInputText);
// Note that it's perfectly OK for a pattern to have a zero-length
// match at the end of a string, so we must make sure that the loop
// runs with startPos == testStartLimit the last time through.
if (findProgressInterrupt(startPos, status))
return FALSE;
}
UPRV_UNREACHABLE_EXIT;
case START_START:
// Matches are only possible at the start of the input string
// (pattern begins with ^ or \A)
if (startPos > fActiveStart) {
fMatch = FALSE;
return FALSE;
}
MatchAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
return fMatch;
case START_SET:
{
// Match may start on any char from a pre-computed set.
U_ASSERT(fPattern->fMinMatchLen > 0);
UTEXT_SETNATIVEINDEX(fInputText, startPos);
for (;;) {
int64_t pos = startPos;
c = UTEXT_NEXT32(fInputText);
startPos = UTEXT_GETNATIVEINDEX(fInputText);
// c will be -1 (U_SENTINEL) at end of text, in which case we
// skip this next block (so we don't have a negative array index)
// and handle end of text in the following block.
if (c >= 0 && ((c<256 && fPattern->fInitialChars8->contains(c)) ||
(c>=256 && fPattern->fInitialChars->contains(c)))) {
MatchAt(pos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
UTEXT_SETNATIVEINDEX(fInputText, pos);
}
if (startPos > testStartLimit) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
if (findProgressInterrupt(startPos, status))
return FALSE;
}
}
UPRV_UNREACHABLE_EXIT;
case START_STRING:
case START_CHAR:
{
// Match starts on exactly one char.
U_ASSERT(fPattern->fMinMatchLen > 0);
UChar32 theChar = fPattern->fInitialChar;
UTEXT_SETNATIVEINDEX(fInputText, startPos);
for (;;) {
int64_t pos = startPos;
c = UTEXT_NEXT32(fInputText);
startPos = UTEXT_GETNATIVEINDEX(fInputText);
if (c == theChar) {
MatchAt(pos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
UTEXT_SETNATIVEINDEX(fInputText, startPos);
}
if (startPos > testStartLimit) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
if (findProgressInterrupt(startPos, status))
return FALSE;
}
}
UPRV_UNREACHABLE_EXIT;
case START_LINE:
{
UChar32 ch;
if (startPos == fAnchorStart) {
MatchAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
UTEXT_SETNATIVEINDEX(fInputText, startPos);
ch = UTEXT_NEXT32(fInputText);
startPos = UTEXT_GETNATIVEINDEX(fInputText);
} else {
UTEXT_SETNATIVEINDEX(fInputText, startPos);
ch = UTEXT_PREVIOUS32(fInputText);
UTEXT_SETNATIVEINDEX(fInputText, startPos);
}
if (fPattern->fFlags & UREGEX_UNIX_LINES) {
for (;;) {
if (ch == 0x0a) {
MatchAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
UTEXT_SETNATIVEINDEX(fInputText, startPos);
}
if (startPos >= testStartLimit) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
ch = UTEXT_NEXT32(fInputText);
startPos = UTEXT_GETNATIVEINDEX(fInputText);
// Note that it's perfectly OK for a pattern to have a zero-length
// match at the end of a string, so we must make sure that the loop
// runs with startPos == testStartLimit the last time through.
if (findProgressInterrupt(startPos, status))
return FALSE;
}
} else {
for (;;) {
if (isLineTerminator(ch)) {
if (ch == 0x0d && startPos < fActiveLimit && UTEXT_CURRENT32(fInputText) == 0x0a) {
(void)UTEXT_NEXT32(fInputText);
startPos = UTEXT_GETNATIVEINDEX(fInputText);
}
MatchAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
UTEXT_SETNATIVEINDEX(fInputText, startPos);
}
if (startPos >= testStartLimit) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
ch = UTEXT_NEXT32(fInputText);
startPos = UTEXT_GETNATIVEINDEX(fInputText);
// Note that it's perfectly OK for a pattern to have a zero-length
// match at the end of a string, so we must make sure that the loop
// runs with startPos == testStartLimit the last time through.
if (findProgressInterrupt(startPos, status))
return FALSE;
}
}
}
default:
UPRV_UNREACHABLE_ASSERT;
// Unknown value in fPattern->fStartType, should be from StartOfMatch enum. But
// we have reports of this in production code, don't use UPRV_UNREACHABLE_EXIT.
// See ICU-21669.
status = U_INTERNAL_PROGRAM_ERROR;
return FALSE;
}
UPRV_UNREACHABLE_EXIT;
}
UBool RegexMatcher::find(int64_t start, UErrorCode &status) {
if (U_FAILURE(status)) {
return FALSE;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return FALSE;
}
this->reset(); // Note: Reset() is specified by Java Matcher documentation.
// This will reset the region to be the full input length.
if (start < 0) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return FALSE;
}
int64_t nativeStart = start;
if (nativeStart < fActiveStart || nativeStart > fActiveLimit) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return FALSE;
}
fMatchEnd = nativeStart;
return find(status);
}
//--------------------------------------------------------------------------------
//
// findUsingChunk() -- like find(), but with the advance knowledge that the
// entire string is available in the UText's chunk buffer.
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::findUsingChunk(UErrorCode &status) {
// Start at the position of the last match end. (Will be zero if the
// matcher has been reset.
//
int32_t startPos = (int32_t)fMatchEnd;
if (startPos==0) {
startPos = (int32_t)fActiveStart;
}
const UChar *inputBuf = fInputText->chunkContents;
if (fMatch) {
// Save the position of any previous successful match.
fLastMatchEnd = fMatchEnd;
if (fMatchStart == fMatchEnd) {
// Previous match had zero length. Move start position up one position
// to avoid sending find() into a loop on zero-length matches.
if (startPos >= fActiveLimit) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
U16_FWD_1(inputBuf, startPos, fInputLength);
}
} else {
if (fLastMatchEnd >= 0) {
// A previous find() failed to match. Don't try again.
// (without this test, a pattern with a zero-length match
// could match again at the end of an input string.)
fHitEnd = TRUE;
return FALSE;
}
}
// Compute the position in the input string beyond which a match can not begin, because
// the minimum length match would extend past the end of the input.
// Note: some patterns that cannot match anything will have fMinMatchLength==Max Int.
// Be aware of possible overflows if making changes here.
// Note: a match can begin at inputBuf + testLen; it is an inclusive limit.
int32_t testLen = (int32_t)(fActiveLimit - fPattern->fMinMatchLen);
if (startPos > testLen) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
UChar32 c;
U_ASSERT(startPos >= 0);
switch (fPattern->fStartType) {
case START_NO_INFO:
// No optimization was found.
// Try a match at each input position.
for (;;) {
MatchChunkAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
if (startPos >= testLen) {
fHitEnd = TRUE;
return FALSE;
}
U16_FWD_1(inputBuf, startPos, fActiveLimit);
// Note that it's perfectly OK for a pattern to have a zero-length
// match at the end of a string, so we must make sure that the loop
// runs with startPos == testLen the last time through.
if (findProgressInterrupt(startPos, status))
return FALSE;
}
UPRV_UNREACHABLE_EXIT;
case START_START:
// Matches are only possible at the start of the input string
// (pattern begins with ^ or \A)
if (startPos > fActiveStart) {
fMatch = FALSE;
return FALSE;
}
MatchChunkAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
return fMatch;
case START_SET:
{
// Match may start on any char from a pre-computed set.
U_ASSERT(fPattern->fMinMatchLen > 0);
for (;;) {
int32_t pos = startPos;
U16_NEXT(inputBuf, startPos, fActiveLimit, c); // like c = inputBuf[startPos++];
if ((c<256 && fPattern->fInitialChars8->contains(c)) ||
(c>=256 && fPattern->fInitialChars->contains(c))) {
MatchChunkAt(pos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
}
if (startPos > testLen) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
if (findProgressInterrupt(startPos, status))
return FALSE;
}
}
UPRV_UNREACHABLE_EXIT;
case START_STRING:
case START_CHAR:
{
// Match starts on exactly one char.
U_ASSERT(fPattern->fMinMatchLen > 0);
UChar32 theChar = fPattern->fInitialChar;
for (;;) {
int32_t pos = startPos;
U16_NEXT(inputBuf, startPos, fActiveLimit, c); // like c = inputBuf[startPos++];
if (c == theChar) {
MatchChunkAt(pos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
}
if (startPos > testLen) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
if (findProgressInterrupt(startPos, status))
return FALSE;
}
}
UPRV_UNREACHABLE_EXIT;
case START_LINE:
{
UChar32 ch;
if (startPos == fAnchorStart) {
MatchChunkAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
U16_FWD_1(inputBuf, startPos, fActiveLimit);
}
if (fPattern->fFlags & UREGEX_UNIX_LINES) {
for (;;) {
ch = inputBuf[startPos-1];
if (ch == 0x0a) {
MatchChunkAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
}
if (startPos >= testLen) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
U16_FWD_1(inputBuf, startPos, fActiveLimit);
// Note that it's perfectly OK for a pattern to have a zero-length
// match at the end of a string, so we must make sure that the loop
// runs with startPos == testLen the last time through.
if (findProgressInterrupt(startPos, status))
return FALSE;
}
} else {
for (;;) {
ch = inputBuf[startPos-1];
if (isLineTerminator(ch)) {
if (ch == 0x0d && startPos < fActiveLimit && inputBuf[startPos] == 0x0a) {
startPos++;
}
MatchChunkAt(startPos, FALSE, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (fMatch) {
return TRUE;
}
}
if (startPos >= testLen) {
fMatch = FALSE;
fHitEnd = TRUE;
return FALSE;
}
U16_FWD_1(inputBuf, startPos, fActiveLimit);
// Note that it's perfectly OK for a pattern to have a zero-length
// match at the end of a string, so we must make sure that the loop
// runs with startPos == testLen the last time through.
if (findProgressInterrupt(startPos, status))
return FALSE;
}
}
}
default:
UPRV_UNREACHABLE_ASSERT;
// Unknown value in fPattern->fStartType, should be from StartOfMatch enum. But
// we have reports of this in production code, don't use UPRV_UNREACHABLE_EXIT.
// See ICU-21669.
status = U_INTERNAL_PROGRAM_ERROR;
return FALSE;
}
UPRV_UNREACHABLE_EXIT;
}
//--------------------------------------------------------------------------------
//
// group()
//
//--------------------------------------------------------------------------------
UnicodeString RegexMatcher::group(UErrorCode &status) const {
return group(0, status);
}
// Return immutable shallow clone
UText *RegexMatcher::group(UText *dest, int64_t &group_len, UErrorCode &status) const {
return group(0, dest, group_len, status);
}
// Return immutable shallow clone
UText *RegexMatcher::group(int32_t groupNum, UText *dest, int64_t &group_len, UErrorCode &status) const {
group_len = 0;
if (U_FAILURE(status)) {
return dest;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
} else if (fMatch == FALSE) {
status = U_REGEX_INVALID_STATE;
} else if (groupNum < 0 || groupNum > fPattern->fGroupMap->size()) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
}
if (U_FAILURE(status)) {
return dest;
}
int64_t s, e;
if (groupNum == 0) {
s = fMatchStart;
e = fMatchEnd;
} else {
int32_t groupOffset = fPattern->fGroupMap->elementAti(groupNum-1);
U_ASSERT(groupOffset < fPattern->fFrameSize);
U_ASSERT(groupOffset >= 0);
s = fFrame->fExtra[groupOffset];
e = fFrame->fExtra[groupOffset+1];
}
if (s < 0) {
// A capture group wasn't part of the match
return utext_clone(dest, fInputText, FALSE, TRUE, &status);
}
U_ASSERT(s <= e);
group_len = e - s;
dest = utext_clone(dest, fInputText, FALSE, TRUE, &status);
if (dest)
UTEXT_SETNATIVEINDEX(dest, s);
return dest;
}
UnicodeString RegexMatcher::group(int32_t groupNum, UErrorCode &status) const {
UnicodeString result;
int64_t groupStart = start64(groupNum, status);
int64_t groupEnd = end64(groupNum, status);
if (U_FAILURE(status) || groupStart == -1 || groupStart == groupEnd) {
return result;
}
// Get the group length using a utext_extract preflight.
// UText is actually pretty efficient at this when underlying encoding is UTF-16.
int32_t length = utext_extract(fInputText, groupStart, groupEnd, NULL, 0, &status);
if (status != U_BUFFER_OVERFLOW_ERROR) {
return result;
}
status = U_ZERO_ERROR;
UChar *buf = result.getBuffer(length);
if (buf == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
} else {
int32_t extractLength = utext_extract(fInputText, groupStart, groupEnd, buf, length, &status);
result.releaseBuffer(extractLength);
U_ASSERT(length == extractLength);
}
return result;
}
//--------------------------------------------------------------------------------
//
// appendGroup() -- currently internal only, appends a group to a UText rather
// than replacing its contents
//
//--------------------------------------------------------------------------------
int64_t RegexMatcher::appendGroup(int32_t groupNum, UText *dest, UErrorCode &status) const {
if (U_FAILURE(status)) {
return 0;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return 0;
}
int64_t destLen = utext_nativeLength(dest);
if (fMatch == FALSE) {
status = U_REGEX_INVALID_STATE;
return utext_replace(dest, destLen, destLen, NULL, 0, &status);
}
if (groupNum < 0 || groupNum > fPattern->fGroupMap->size()) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return utext_replace(dest, destLen, destLen, NULL, 0, &status);
}
int64_t s, e;
if (groupNum == 0) {
s = fMatchStart;
e = fMatchEnd;
} else {
int32_t groupOffset = fPattern->fGroupMap->elementAti(groupNum-1);
U_ASSERT(groupOffset < fPattern->fFrameSize);
U_ASSERT(groupOffset >= 0);
s = fFrame->fExtra[groupOffset];
e = fFrame->fExtra[groupOffset+1];
}
if (s < 0) {
// A capture group wasn't part of the match
return utext_replace(dest, destLen, destLen, NULL, 0, &status);
}
U_ASSERT(s <= e);
int64_t deltaLen;
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
U_ASSERT(e <= fInputLength);
deltaLen = utext_replace(dest, destLen, destLen, fInputText->chunkContents+s, (int32_t)(e-s), &status);
} else {
int32_t len16;
if (UTEXT_USES_U16(fInputText)) {
len16 = (int32_t)(e-s);
} else {
UErrorCode lengthStatus = U_ZERO_ERROR;
len16 = utext_extract(fInputText, s, e, NULL, 0, &lengthStatus);
}
UChar *groupChars = (UChar *)uprv_malloc(sizeof(UChar)*(len16+1));
if (groupChars == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return 0;
}
utext_extract(fInputText, s, e, groupChars, len16+1, &status);
deltaLen = utext_replace(dest, destLen, destLen, groupChars, len16, &status);
uprv_free(groupChars);
}
return deltaLen;
}
//--------------------------------------------------------------------------------
//
// groupCount()
//
//--------------------------------------------------------------------------------
int32_t RegexMatcher::groupCount() const {
return fPattern->fGroupMap->size();
}
//--------------------------------------------------------------------------------
//
// hasAnchoringBounds()
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::hasAnchoringBounds() const {
return fAnchoringBounds;
}
//--------------------------------------------------------------------------------
//
// hasTransparentBounds()
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::hasTransparentBounds() const {
return fTransparentBounds;
}
//--------------------------------------------------------------------------------
//
// hitEnd()
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::hitEnd() const {
return fHitEnd;
}
//--------------------------------------------------------------------------------
//
// input()
//
//--------------------------------------------------------------------------------
const UnicodeString &RegexMatcher::input() const {
if (!fInput) {
UErrorCode status = U_ZERO_ERROR;
int32_t len16;
if (UTEXT_USES_U16(fInputText)) {
len16 = (int32_t)fInputLength;
} else {
len16 = utext_extract(fInputText, 0, fInputLength, NULL, 0, &status);
status = U_ZERO_ERROR; // overflow, length status
}
UnicodeString *result = new UnicodeString(len16, 0, 0);
UChar *inputChars = result->getBuffer(len16);
utext_extract(fInputText, 0, fInputLength, inputChars, len16, &status); // unterminated warning
result->releaseBuffer(len16);
(*(const UnicodeString **)&fInput) = result; // pointer assignment, rather than operator=
}
return *fInput;
}
//--------------------------------------------------------------------------------
//
// inputText()
//
//--------------------------------------------------------------------------------
UText *RegexMatcher::inputText() const {
return fInputText;
}
//--------------------------------------------------------------------------------
//
// getInput() -- like inputText(), but makes a clone or copies into another UText
//
//--------------------------------------------------------------------------------
UText *RegexMatcher::getInput (UText *dest, UErrorCode &status) const {
if (U_FAILURE(status)) {
return dest;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return dest;
}
if (dest) {
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
utext_replace(dest, 0, utext_nativeLength(dest), fInputText->chunkContents, (int32_t)fInputLength, &status);
} else {
int32_t input16Len;
if (UTEXT_USES_U16(fInputText)) {
input16Len = (int32_t)fInputLength;
} else {
UErrorCode lengthStatus = U_ZERO_ERROR;
input16Len = utext_extract(fInputText, 0, fInputLength, NULL, 0, &lengthStatus); // buffer overflow error
}
UChar *inputChars = (UChar *)uprv_malloc(sizeof(UChar)*(input16Len));
if (inputChars == NULL) {
return dest;
}
status = U_ZERO_ERROR;
utext_extract(fInputText, 0, fInputLength, inputChars, input16Len, &status); // not terminated warning
status = U_ZERO_ERROR;
utext_replace(dest, 0, utext_nativeLength(dest), inputChars, input16Len, &status);
uprv_free(inputChars);
}
return dest;
} else {
return utext_clone(NULL, fInputText, FALSE, TRUE, &status);
}
}
static UBool compat_SyncMutableUTextContents(UText *ut);
static UBool compat_SyncMutableUTextContents(UText *ut) {
UBool retVal = FALSE;
// In the following test, we're really only interested in whether the UText should switch
// between heap and stack allocation. If length hasn't changed, we won't, so the chunkContents
// will still point to the correct data.
if (utext_nativeLength(ut) != ut->nativeIndexingLimit) {
UnicodeString *us=(UnicodeString *)ut->context;
// Update to the latest length.
// For example, (utext_nativeLength(ut) != ut->nativeIndexingLimit).
int32_t newLength = us->length();
// Update the chunk description.
// The buffer may have switched between stack- and heap-based.
ut->chunkContents = us->getBuffer();
ut->chunkLength = newLength;
ut->chunkNativeLimit = newLength;
ut->nativeIndexingLimit = newLength;
retVal = TRUE;
}
return retVal;
}
//--------------------------------------------------------------------------------
//
// lookingAt()
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::lookingAt(UErrorCode &status) {
if (U_FAILURE(status)) {
return FALSE;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return FALSE;
}
if (fInputUniStrMaybeMutable) {
if (compat_SyncMutableUTextContents(fInputText)) {
fInputLength = utext_nativeLength(fInputText);
reset();
}
}
else {
resetPreserveRegion();
}
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
MatchChunkAt((int32_t)fActiveStart, FALSE, status);
} else {
MatchAt(fActiveStart, FALSE, status);
}
return fMatch;
}
UBool RegexMatcher::lookingAt(int64_t start, UErrorCode &status) {
if (U_FAILURE(status)) {
return FALSE;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return FALSE;
}
reset();
if (start < 0) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return FALSE;
}
if (fInputUniStrMaybeMutable) {
if (compat_SyncMutableUTextContents(fInputText)) {
fInputLength = utext_nativeLength(fInputText);
reset();
}
}
int64_t nativeStart;
nativeStart = start;
if (nativeStart < fActiveStart || nativeStart > fActiveLimit) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return FALSE;
}
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
MatchChunkAt((int32_t)nativeStart, FALSE, status);
} else {
MatchAt(nativeStart, FALSE, status);
}
return fMatch;
}
//--------------------------------------------------------------------------------
//
// matches()
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::matches(UErrorCode &status) {
if (U_FAILURE(status)) {
return FALSE;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return FALSE;
}
if (fInputUniStrMaybeMutable) {
if (compat_SyncMutableUTextContents(fInputText)) {
fInputLength = utext_nativeLength(fInputText);
reset();
}
}
else {
resetPreserveRegion();
}
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
MatchChunkAt((int32_t)fActiveStart, TRUE, status);
} else {
MatchAt(fActiveStart, TRUE, status);
}
return fMatch;
}
UBool RegexMatcher::matches(int64_t start, UErrorCode &status) {
if (U_FAILURE(status)) {
return FALSE;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return FALSE;
}
reset();
if (start < 0) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return FALSE;
}
if (fInputUniStrMaybeMutable) {
if (compat_SyncMutableUTextContents(fInputText)) {
fInputLength = utext_nativeLength(fInputText);
reset();
}
}
int64_t nativeStart;
nativeStart = start;
if (nativeStart < fActiveStart || nativeStart > fActiveLimit) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return FALSE;
}
if (UTEXT_FULL_TEXT_IN_CHUNK(fInputText, fInputLength)) {
MatchChunkAt((int32_t)nativeStart, TRUE, status);
} else {
MatchAt(nativeStart, TRUE, status);
}
return fMatch;
}
//--------------------------------------------------------------------------------
//
// pattern
//
//--------------------------------------------------------------------------------
const RegexPattern &RegexMatcher::pattern() const {
return *fPattern;
}
//--------------------------------------------------------------------------------
//
// region
//
//--------------------------------------------------------------------------------
RegexMatcher &RegexMatcher::region(int64_t regionStart, int64_t regionLimit, int64_t startIndex, UErrorCode &status) {
if (U_FAILURE(status)) {
return *this;
}
if (regionStart>regionLimit || regionStart<0 || regionLimit<0) {
status = U_ILLEGAL_ARGUMENT_ERROR;
}
int64_t nativeStart = regionStart;
int64_t nativeLimit = regionLimit;
if (nativeStart > fInputLength || nativeLimit > fInputLength) {
status = U_ILLEGAL_ARGUMENT_ERROR;
}
if (startIndex == -1)
this->reset();
else
resetPreserveRegion();
fRegionStart = nativeStart;
fRegionLimit = nativeLimit;
fActiveStart = nativeStart;
fActiveLimit = nativeLimit;
if (startIndex != -1) {
if (startIndex < fActiveStart || startIndex > fActiveLimit) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
}
fMatchEnd = startIndex;
}
if (!fTransparentBounds) {
fLookStart = nativeStart;
fLookLimit = nativeLimit;
}
if (fAnchoringBounds) {
fAnchorStart = nativeStart;
fAnchorLimit = nativeLimit;
}
return *this;
}
RegexMatcher &RegexMatcher::region(int64_t start, int64_t limit, UErrorCode &status) {
return region(start, limit, -1, status);
}
//--------------------------------------------------------------------------------
//
// regionEnd
//
//--------------------------------------------------------------------------------
int32_t RegexMatcher::regionEnd() const {
return (int32_t)fRegionLimit;
}
int64_t RegexMatcher::regionEnd64() const {
return fRegionLimit;
}
//--------------------------------------------------------------------------------
//
// regionStart
//
//--------------------------------------------------------------------------------
int32_t RegexMatcher::regionStart() const {
return (int32_t)fRegionStart;
}
int64_t RegexMatcher::regionStart64() const {
return fRegionStart;
}
//--------------------------------------------------------------------------------
//
// replaceAll
//
//--------------------------------------------------------------------------------
UnicodeString RegexMatcher::replaceAll(const UnicodeString &replacement, UErrorCode &status) {
UText replacementText = UTEXT_INITIALIZER;
UText resultText = UTEXT_INITIALIZER;
UnicodeString resultString;
if (U_FAILURE(status)) {
return resultString;
}
utext_openConstUnicodeString(&replacementText, &replacement, &status);
utext_openUnicodeString(&resultText, &resultString, &status);
replaceAll(&replacementText, &resultText, status);
utext_close(&resultText);
utext_close(&replacementText);
return resultString;
}
//
// replaceAll, UText mode
//
UText *RegexMatcher::replaceAll(UText *replacement, UText *dest, UErrorCode &status) {
if (U_FAILURE(status)) {
return dest;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return dest;
}
if (dest == NULL) {
UnicodeString emptyString;
UText empty = UTEXT_INITIALIZER;
utext_openUnicodeString(&empty, &emptyString, &status);
dest = utext_clone(NULL, &empty, TRUE, FALSE, &status);
utext_close(&empty);
}
if (U_SUCCESS(status)) {
reset();
while (find()) {
appendReplacement(dest, replacement, status);
if (U_FAILURE(status)) {
break;
}
}
appendTail(dest, status);
}
return dest;
}
//--------------------------------------------------------------------------------
//
// replaceFirst
//
//--------------------------------------------------------------------------------
UnicodeString RegexMatcher::replaceFirst(const UnicodeString &replacement, UErrorCode &status) {
UText replacementText = UTEXT_INITIALIZER;
UText resultText = UTEXT_INITIALIZER;
UnicodeString resultString;
utext_openConstUnicodeString(&replacementText, &replacement, &status);
utext_openUnicodeString(&resultText, &resultString, &status);
replaceFirst(&replacementText, &resultText, status);
utext_close(&resultText);
utext_close(&replacementText);
return resultString;
}
//
// replaceFirst, UText mode
//
UText *RegexMatcher::replaceFirst(UText *replacement, UText *dest, UErrorCode &status) {
if (U_FAILURE(status)) {
return dest;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return dest;
}
reset();
if (!find()) {
return getInput(dest, status);
}
if (dest == NULL) {
UnicodeString emptyString;
UText empty = UTEXT_INITIALIZER;
utext_openUnicodeString(&empty, &emptyString, &status);
dest = utext_clone(NULL, &empty, TRUE, FALSE, &status);
utext_close(&empty);
}
appendReplacement(dest, replacement, status);
appendTail(dest, status);
return dest;
}
//--------------------------------------------------------------------------------
//
// requireEnd
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::requireEnd() const {
return fRequireEnd;
}
//--------------------------------------------------------------------------------
//
// reset
//
//--------------------------------------------------------------------------------
RegexMatcher &RegexMatcher::reset() {
fRegionStart = 0;
fRegionLimit = fInputLength;
fActiveStart = 0;
fActiveLimit = fInputLength;
fAnchorStart = 0;
fAnchorLimit = fInputLength;
fLookStart = 0;
fLookLimit = fInputLength;
resetPreserveRegion();
return *this;
}
void RegexMatcher::resetPreserveRegion() {
fMatchStart = 0;
fMatchEnd = 0;
fLastMatchEnd = -1;
fAppendPosition = 0;
fMatch = FALSE;
fHitEnd = FALSE;
fRequireEnd = FALSE;
fTime = 0;
fTickCounter = TIMER_INITIAL_VALUE;
//resetStack(); // more expensive than it looks...
}
RegexMatcher &RegexMatcher::reset(const UnicodeString &input) {
fInputText = utext_openConstUnicodeString(fInputText, &input, &fDeferredStatus);
if (fPattern->fNeedsAltInput) {
fAltInputText = utext_clone(fAltInputText, fInputText, FALSE, TRUE, &fDeferredStatus);
}
if (U_FAILURE(fDeferredStatus)) {
return *this;
}
fInputLength = utext_nativeLength(fInputText);
reset();
delete fInput;
fInput = NULL;
// Do the following for any UnicodeString.
// This is for compatibility for those clients who modify the input string "live" during regex operations.
fInputUniStrMaybeMutable = TRUE;
#if UCONFIG_NO_BREAK_ITERATION==0
if (fWordBreakItr) {
fWordBreakItr->setText(fInputText, fDeferredStatus);
}
if (fGCBreakItr) {
fGCBreakItr->setText(fInputText, fDeferredStatus);
}
#endif
return *this;
}
RegexMatcher &RegexMatcher::reset(UText *input) {
if (fInputText != input) {
fInputText = utext_clone(fInputText, input, FALSE, TRUE, &fDeferredStatus);
if (fPattern->fNeedsAltInput) fAltInputText = utext_clone(fAltInputText, fInputText, FALSE, TRUE, &fDeferredStatus);
if (U_FAILURE(fDeferredStatus)) {
return *this;
}
fInputLength = utext_nativeLength(fInputText);
delete fInput;
fInput = NULL;
#if UCONFIG_NO_BREAK_ITERATION==0
if (fWordBreakItr) {
fWordBreakItr->setText(input, fDeferredStatus);
}
if (fGCBreakItr) {
fGCBreakItr->setText(fInputText, fDeferredStatus);
}
#endif
}
reset();
fInputUniStrMaybeMutable = FALSE;
return *this;
}
/*RegexMatcher &RegexMatcher::reset(const UChar *) {
fDeferredStatus = U_INTERNAL_PROGRAM_ERROR;
return *this;
}*/
RegexMatcher &RegexMatcher::reset(int64_t position, UErrorCode &status) {
if (U_FAILURE(status)) {
return *this;
}
reset(); // Reset also resets the region to be the entire string.
if (position < 0 || position > fActiveLimit) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return *this;
}
fMatchEnd = position;
return *this;
}
//--------------------------------------------------------------------------------
//
// refresh
//
//--------------------------------------------------------------------------------
RegexMatcher &RegexMatcher::refreshInputText(UText *input, UErrorCode &status) {
if (U_FAILURE(status)) {
return *this;
}
if (input == NULL) {
status = U_ILLEGAL_ARGUMENT_ERROR;
return *this;
}
if (utext_nativeLength(fInputText) != utext_nativeLength(input)) {
status = U_ILLEGAL_ARGUMENT_ERROR;
return *this;
}
int64_t pos = utext_getNativeIndex(fInputText);
// Shallow read-only clone of the new UText into the existing input UText
fInputText = utext_clone(fInputText, input, FALSE, TRUE, &status);
if (U_FAILURE(status)) {
return *this;
}
utext_setNativeIndex(fInputText, pos);
if (fAltInputText != NULL) {
pos = utext_getNativeIndex(fAltInputText);
fAltInputText = utext_clone(fAltInputText, input, FALSE, TRUE, &status);
if (U_FAILURE(status)) {
return *this;
}
utext_setNativeIndex(fAltInputText, pos);
}
return *this;
}
//--------------------------------------------------------------------------------
//
// setTrace
//
//--------------------------------------------------------------------------------
void RegexMatcher::setTrace(UBool state) {
fTraceDebug = state;
}
/**
* UText, replace entire contents of the destination UText with a substring of the source UText.
*
* @param src The source UText
* @param dest The destination UText. Must be writable.
* May be NULL, in which case a new UText will be allocated.
* @param start Start index of source substring.
* @param limit Limit index of source substring.
* @param status An error code.
*/
static UText *utext_extract_replace(UText *src, UText *dest, int64_t start, int64_t limit, UErrorCode *status) {
if (U_FAILURE(*status)) {
return dest;
}
if (start == limit) {
if (dest) {
utext_replace(dest, 0, utext_nativeLength(dest), NULL, 0, status);
return dest;
} else {
return utext_openUChars(NULL, NULL, 0, status);
}
}
int32_t length = utext_extract(src, start, limit, NULL, 0, status);
if (*status != U_BUFFER_OVERFLOW_ERROR && U_FAILURE(*status)) {
return dest;
}
*status = U_ZERO_ERROR;
MaybeStackArray<UChar, 40> buffer;
if (length >= buffer.getCapacity()) {
UChar *newBuf = buffer.resize(length+1); // Leave space for terminating Nul.
if (newBuf == NULL) {
*status = U_MEMORY_ALLOCATION_ERROR;
}
}
utext_extract(src, start, limit, buffer.getAlias(), length+1, status);
if (dest) {
utext_replace(dest, 0, utext_nativeLength(dest), buffer.getAlias(), length, status);
return dest;
}
// Caller did not provide a preexisting UText.
// Open a new one, and have it adopt the text buffer storage.
if (U_FAILURE(*status)) {
return NULL;
}
int32_t ownedLength = 0;
UChar *ownedBuf = buffer.orphanOrClone(length+1, ownedLength);
if (ownedBuf == NULL) {
*status = U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
UText *result = utext_openUChars(NULL, ownedBuf, length, status);
if (U_FAILURE(*status)) {
uprv_free(ownedBuf);
return NULL;
}
result->providerProperties |= (1 << UTEXT_PROVIDER_OWNS_TEXT);
return result;
}
//---------------------------------------------------------------------
//
// split
//
//---------------------------------------------------------------------
int32_t RegexMatcher::split(const UnicodeString &input,
UnicodeString dest[],
int32_t destCapacity,
UErrorCode &status)
{
UText inputText = UTEXT_INITIALIZER;
utext_openConstUnicodeString(&inputText, &input, &status);
if (U_FAILURE(status)) {
return 0;
}
UText **destText = (UText **)uprv_malloc(sizeof(UText*)*destCapacity);
if (destText == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return 0;
}
int32_t i;
for (i = 0; i < destCapacity; i++) {
destText[i] = utext_openUnicodeString(NULL, &dest[i], &status);
}
int32_t fieldCount = split(&inputText, destText, destCapacity, status);
for (i = 0; i < destCapacity; i++) {
utext_close(destText[i]);
}
uprv_free(destText);
utext_close(&inputText);
return fieldCount;
}
//
// split, UText mode
//
int32_t RegexMatcher::split(UText *input,
UText *dest[],
int32_t destCapacity,
UErrorCode &status)
{
//
// Check arguments for validity
//
if (U_FAILURE(status)) {
return 0;
}
if (destCapacity < 1) {
status = U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
//
// Reset for the input text
//
reset(input);
int64_t nextOutputStringStart = 0;
if (fActiveLimit == 0) {
return 0;
}
//
// Loop through the input text, searching for the delimiter pattern
//
int32_t i;
int32_t numCaptureGroups = fPattern->fGroupMap->size();
for (i=0; ; i++) {
if (i>=destCapacity-1) {
// There is one or zero output string left.
// Fill the last output string with whatever is left from the input, then exit the loop.
// ( i will be == destCapacity if we filled the output array while processing
// capture groups of the delimiter expression, in which case we will discard the
// last capture group saved in favor of the unprocessed remainder of the
// input string.)
i = destCapacity-1;
if (fActiveLimit > nextOutputStringStart) {
if (UTEXT_FULL_TEXT_IN_CHUNK(input, fInputLength)) {
if (dest[i]) {
utext_replace(dest[i], 0, utext_nativeLength(dest[i]),
input->chunkContents+nextOutputStringStart,
(int32_t)(fActiveLimit-nextOutputStringStart), &status);
} else {
UText remainingText = UTEXT_INITIALIZER;
utext_openUChars(&remainingText, input->chunkContents+nextOutputStringStart,
fActiveLimit-nextOutputStringStart, &status);
dest[i] = utext_clone(NULL, &remainingText, TRUE, FALSE, &status);
utext_close(&remainingText);
}
} else {
UErrorCode lengthStatus = U_ZERO_ERROR;
int32_t remaining16Length =
utext_extract(input, nextOutputStringStart, fActiveLimit, NULL, 0, &lengthStatus);
UChar *remainingChars = (UChar *)uprv_malloc(sizeof(UChar)*(remaining16Length+1));
if (remainingChars == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
break;
}
utext_extract(input, nextOutputStringStart, fActiveLimit, remainingChars, remaining16Length+1, &status);
if (dest[i]) {
utext_replace(dest[i], 0, utext_nativeLength(dest[i]), remainingChars, remaining16Length, &status);
} else {
UText remainingText = UTEXT_INITIALIZER;
utext_openUChars(&remainingText, remainingChars, remaining16Length, &status);
dest[i] = utext_clone(NULL, &remainingText, TRUE, FALSE, &status);
utext_close(&remainingText);
}
uprv_free(remainingChars);
}
}
break;
}
if (find()) {
// We found another delimiter. Move everything from where we started looking
// up until the start of the delimiter into the next output string.
if (UTEXT_FULL_TEXT_IN_CHUNK(input, fInputLength)) {
if (dest[i]) {
utext_replace(dest[i], 0, utext_nativeLength(dest[i]),
input->chunkContents+nextOutputStringStart,
(int32_t)(fMatchStart-nextOutputStringStart), &status);
} else {
UText remainingText = UTEXT_INITIALIZER;
utext_openUChars(&remainingText, input->chunkContents+nextOutputStringStart,
fMatchStart-nextOutputStringStart, &status);
dest[i] = utext_clone(NULL, &remainingText, TRUE, FALSE, &status);
utext_close(&remainingText);
}
} else {
UErrorCode lengthStatus = U_ZERO_ERROR;
int32_t remaining16Length = utext_extract(input, nextOutputStringStart, fMatchStart, NULL, 0, &lengthStatus);
UChar *remainingChars = (UChar *)uprv_malloc(sizeof(UChar)*(remaining16Length+1));
if (remainingChars == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
break;
}
utext_extract(input, nextOutputStringStart, fMatchStart, remainingChars, remaining16Length+1, &status);
if (dest[i]) {
utext_replace(dest[i], 0, utext_nativeLength(dest[i]), remainingChars, remaining16Length, &status);
} else {
UText remainingText = UTEXT_INITIALIZER;
utext_openUChars(&remainingText, remainingChars, remaining16Length, &status);
dest[i] = utext_clone(NULL, &remainingText, TRUE, FALSE, &status);
utext_close(&remainingText);
}
uprv_free(remainingChars);
}
nextOutputStringStart = fMatchEnd;
// If the delimiter pattern has capturing parentheses, the captured
// text goes out into the next n destination strings.
int32_t groupNum;
for (groupNum=1; groupNum<=numCaptureGroups; groupNum++) {
if (i >= destCapacity-2) {
// Never fill the last available output string with capture group text.
// It will filled with the last field, the remainder of the
// unsplit input text.
break;
}
i++;
dest[i] = utext_extract_replace(fInputText, dest[i],
start64(groupNum, status), end64(groupNum, status), &status);
}
if (nextOutputStringStart == fActiveLimit) {
// The delimiter was at the end of the string. We're done, but first
// we output one last empty string, for the empty field following
// the delimiter at the end of input.
if (i+1 < destCapacity) {
++i;
if (dest[i] == NULL) {
dest[i] = utext_openUChars(NULL, NULL, 0, &status);
} else {
static const UChar emptyString[] = {(UChar)0};
utext_replace(dest[i], 0, utext_nativeLength(dest[i]), emptyString, 0, &status);
}
}
break;
}
}
else
{
// We ran off the end of the input while looking for the next delimiter.
// All the remaining text goes into the current output string.
if (UTEXT_FULL_TEXT_IN_CHUNK(input, fInputLength)) {
if (dest[i]) {
utext_replace(dest[i], 0, utext_nativeLength(dest[i]),
input->chunkContents+nextOutputStringStart,
(int32_t)(fActiveLimit-nextOutputStringStart), &status);
} else {
UText remainingText = UTEXT_INITIALIZER;
utext_openUChars(&remainingText, input->chunkContents+nextOutputStringStart,
fActiveLimit-nextOutputStringStart, &status);
dest[i] = utext_clone(NULL, &remainingText, TRUE, FALSE, &status);
utext_close(&remainingText);
}
} else {
UErrorCode lengthStatus = U_ZERO_ERROR;
int32_t remaining16Length = utext_extract(input, nextOutputStringStart, fActiveLimit, NULL, 0, &lengthStatus);
UChar *remainingChars = (UChar *)uprv_malloc(sizeof(UChar)*(remaining16Length+1));
if (remainingChars == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
break;
}
utext_extract(input, nextOutputStringStart, fActiveLimit, remainingChars, remaining16Length+1, &status);
if (dest[i]) {
utext_replace(dest[i], 0, utext_nativeLength(dest[i]), remainingChars, remaining16Length, &status);
} else {
UText remainingText = UTEXT_INITIALIZER;
utext_openUChars(&remainingText, remainingChars, remaining16Length, &status);
dest[i] = utext_clone(NULL, &remainingText, TRUE, FALSE, &status);
utext_close(&remainingText);
}
uprv_free(remainingChars);
}
break;
}
if (U_FAILURE(status)) {
break;
}
} // end of for loop
return i+1;
}
//--------------------------------------------------------------------------------
//
// start
//
//--------------------------------------------------------------------------------
int32_t RegexMatcher::start(UErrorCode &status) const {
return start(0, status);
}
int64_t RegexMatcher::start64(UErrorCode &status) const {
return start64(0, status);
}
//--------------------------------------------------------------------------------
//
// start(int32_t group, UErrorCode &status)
//
//--------------------------------------------------------------------------------
int64_t RegexMatcher::start64(int32_t group, UErrorCode &status) const {
if (U_FAILURE(status)) {
return -1;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return -1;
}
if (fMatch == FALSE) {
status = U_REGEX_INVALID_STATE;
return -1;
}
if (group < 0 || group > fPattern->fGroupMap->size()) {
status = U_INDEX_OUTOFBOUNDS_ERROR;
return -1;
}
int64_t s;
if (group == 0) {
s = fMatchStart;
} else {
int32_t groupOffset = fPattern->fGroupMap->elementAti(group-1);
U_ASSERT(groupOffset < fPattern->fFrameSize);
U_ASSERT(groupOffset >= 0);
s = fFrame->fExtra[groupOffset];
}
return s;
}
int32_t RegexMatcher::start(int32_t group, UErrorCode &status) const {
return (int32_t)start64(group, status);
}
//--------------------------------------------------------------------------------
//
// useAnchoringBounds
//
//--------------------------------------------------------------------------------
RegexMatcher &RegexMatcher::useAnchoringBounds(UBool b) {
fAnchoringBounds = b;
fAnchorStart = (fAnchoringBounds ? fRegionStart : 0);
fAnchorLimit = (fAnchoringBounds ? fRegionLimit : fInputLength);
return *this;
}
//--------------------------------------------------------------------------------
//
// useTransparentBounds
//
//--------------------------------------------------------------------------------
RegexMatcher &RegexMatcher::useTransparentBounds(UBool b) {
fTransparentBounds = b;
fLookStart = (fTransparentBounds ? 0 : fRegionStart);
fLookLimit = (fTransparentBounds ? fInputLength : fRegionLimit);
return *this;
}
//--------------------------------------------------------------------------------
//
// setTimeLimit
//
//--------------------------------------------------------------------------------
void RegexMatcher::setTimeLimit(int32_t limit, UErrorCode &status) {
if (U_FAILURE(status)) {
return;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return;
}
if (limit < 0) {
status = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
fTimeLimit = limit;
}
//--------------------------------------------------------------------------------
//
// getTimeLimit
//
//--------------------------------------------------------------------------------
int32_t RegexMatcher::getTimeLimit() const {
return fTimeLimit;
}
//--------------------------------------------------------------------------------
//
// setStackLimit
//
//--------------------------------------------------------------------------------
void RegexMatcher::setStackLimit(int32_t limit, UErrorCode &status) {
if (U_FAILURE(status)) {
return;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return;
}
if (limit < 0) {
status = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
// Reset the matcher. This is needed here in case there is a current match
// whose final stack frame (containing the match results, pointed to by fFrame)
// would be lost by resizing to a smaller stack size.
reset();
if (limit == 0) {
// Unlimited stack expansion
fStack->setMaxCapacity(0);
} else {
// Change the units of the limit from bytes to ints, and bump the size up
// to be big enough to hold at least one stack frame for the pattern,
// if it isn't there already.
int32_t adjustedLimit = limit / sizeof(int32_t);
if (adjustedLimit < fPattern->fFrameSize) {
adjustedLimit = fPattern->fFrameSize;
}
fStack->setMaxCapacity(adjustedLimit);
}
fStackLimit = limit;
}
//--------------------------------------------------------------------------------
//
// getStackLimit
//
//--------------------------------------------------------------------------------
int32_t RegexMatcher::getStackLimit() const {
return fStackLimit;
}
//--------------------------------------------------------------------------------
//
// setMatchCallback
//
//--------------------------------------------------------------------------------
void RegexMatcher::setMatchCallback(URegexMatchCallback *callback,
const void *context,
UErrorCode &status) {
if (U_FAILURE(status)) {
return;
}
fCallbackFn = callback;
fCallbackContext = context;
}
//--------------------------------------------------------------------------------
//
// getMatchCallback
//
//--------------------------------------------------------------------------------
void RegexMatcher::getMatchCallback(URegexMatchCallback *&callback,
const void *&context,
UErrorCode &status) {
if (U_FAILURE(status)) {
return;
}
callback = fCallbackFn;
context = fCallbackContext;
}
//--------------------------------------------------------------------------------
//
// setMatchCallback
//
//--------------------------------------------------------------------------------
void RegexMatcher::setFindProgressCallback(URegexFindProgressCallback *callback,
const void *context,
UErrorCode &status) {
if (U_FAILURE(status)) {
return;
}
fFindProgressCallbackFn = callback;
fFindProgressCallbackContext = context;
}
//--------------------------------------------------------------------------------
//
// getMatchCallback
//
//--------------------------------------------------------------------------------
void RegexMatcher::getFindProgressCallback(URegexFindProgressCallback *&callback,
const void *&context,
UErrorCode &status) {
if (U_FAILURE(status)) {
return;
}
callback = fFindProgressCallbackFn;
context = fFindProgressCallbackContext;
}
//================================================================================
//
// Code following this point in this file is the internal
// Match Engine Implementation.
//
//================================================================================
//--------------------------------------------------------------------------------
//
// resetStack
// Discard any previous contents of the state save stack, and initialize a
// new stack frame to all -1. The -1s are needed for capture group limits,
// where they indicate that a group has not yet matched anything.
//--------------------------------------------------------------------------------
REStackFrame *RegexMatcher::resetStack() {
// Discard any previous contents of the state save stack, and initialize a
// new stack frame with all -1 data. The -1s are needed for capture group limits,
// where they indicate that a group has not yet matched anything.
fStack->removeAllElements();
REStackFrame *iFrame = (REStackFrame *)fStack->reserveBlock(fPattern->fFrameSize, fDeferredStatus);
if(U_FAILURE(fDeferredStatus)) {
return NULL;
}
int32_t i;
for (i=0; i<fPattern->fFrameSize-RESTACKFRAME_HDRCOUNT; i++) {
iFrame->fExtra[i] = -1;
}
return iFrame;
}
//--------------------------------------------------------------------------------
//
// isWordBoundary
// in perl, "xab..cd..", \b is true at positions 0,3,5,7
// For us,
// If the current char is a combining mark,
// \b is FALSE.
// Else Scan backwards to the first non-combining char.
// We are at a boundary if the this char and the original chars are
// opposite in membership in \w set
//
// parameters: pos - the current position in the input buffer
//
// TODO: double-check edge cases at region boundaries.
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::isWordBoundary(int64_t pos) {
UBool isBoundary = FALSE;
UBool cIsWord = FALSE;
if (pos >= fLookLimit) {
fHitEnd = TRUE;
} else {
// Determine whether char c at current position is a member of the word set of chars.
// If we're off the end of the string, behave as though we're not at a word char.
UTEXT_SETNATIVEINDEX(fInputText, pos);
UChar32 c = UTEXT_CURRENT32(fInputText);
if (u_hasBinaryProperty(c, UCHAR_GRAPHEME_EXTEND) || u_charType(c) == U_FORMAT_CHAR) {
// Current char is a combining one. Not a boundary.
return FALSE;
}
cIsWord = RegexStaticSets::gStaticSets->fPropSets[URX_ISWORD_SET].contains(c);
}
// Back up until we come to a non-combining char, determine whether
// that char is a word char.
UBool prevCIsWord = FALSE;
for (;;) {
if (UTEXT_GETNATIVEINDEX(fInputText) <= fLookStart) {
break;
}
UChar32 prevChar = UTEXT_PREVIOUS32(fInputText);
if (!(u_hasBinaryProperty(prevChar, UCHAR_GRAPHEME_EXTEND)
|| u_charType(prevChar) == U_FORMAT_CHAR)) {
prevCIsWord = RegexStaticSets::gStaticSets->fPropSets[URX_ISWORD_SET].contains(prevChar);
break;
}
}
isBoundary = cIsWord ^ prevCIsWord;
return isBoundary;
}
UBool RegexMatcher::isChunkWordBoundary(int32_t pos) {
UBool isBoundary = FALSE;
UBool cIsWord = FALSE;
const UChar *inputBuf = fInputText->chunkContents;
if (pos >= fLookLimit) {
fHitEnd = TRUE;
} else {
// Determine whether char c at current position is a member of the word set of chars.
// If we're off the end of the string, behave as though we're not at a word char.
UChar32 c;
U16_GET(inputBuf, fLookStart, pos, fLookLimit, c);
if (u_hasBinaryProperty(c, UCHAR_GRAPHEME_EXTEND) || u_charType(c) == U_FORMAT_CHAR) {
// Current char is a combining one. Not a boundary.
return FALSE;
}
cIsWord = RegexStaticSets::gStaticSets->fPropSets[URX_ISWORD_SET].contains(c);
}
// Back up until we come to a non-combining char, determine whether
// that char is a word char.
UBool prevCIsWord = FALSE;
for (;;) {
if (pos <= fLookStart) {
break;
}
UChar32 prevChar;
U16_PREV(inputBuf, fLookStart, pos, prevChar);
if (!(u_hasBinaryProperty(prevChar, UCHAR_GRAPHEME_EXTEND)
|| u_charType(prevChar) == U_FORMAT_CHAR)) {
prevCIsWord = RegexStaticSets::gStaticSets->fPropSets[URX_ISWORD_SET].contains(prevChar);
break;
}
}
isBoundary = cIsWord ^ prevCIsWord;
return isBoundary;
}
//--------------------------------------------------------------------------------
//
// isUWordBoundary
//
// Test for a word boundary using RBBI word break.
//
// parameters: pos - the current position in the input buffer
//
//--------------------------------------------------------------------------------
UBool RegexMatcher::isUWordBoundary(int64_t pos, UErrorCode &status) {
UBool returnVal = FALSE;
#if UCONFIG_NO_BREAK_ITERATION==0
// Note: this point will never be reached if break iteration is configured out.
// Regex patterns that would require this function will fail to compile.
// If we haven't yet created a break iterator for this matcher, do it now.
if (fWordBreakItr == nullptr) {
fWordBreakItr = BreakIterator::createWordInstance(Locale::getEnglish(), status);
if (U_FAILURE(status)) {
return FALSE;
}
fWordBreakItr->setText(fInputText, status);
}
// Note: zero width boundary tests like \b see through transparent region bounds,
// which is why fLookLimit is used here, rather than fActiveLimit.
if (pos >= fLookLimit) {
fHitEnd = TRUE;
returnVal = TRUE; // With Unicode word rules, only positions within the interior of "real"
// words are not boundaries. All non-word chars stand by themselves,
// with word boundaries on both sides.
} else {
returnVal = fWordBreakItr->isBoundary((int32_t)pos);
}
#endif
return returnVal;
}
int64_t RegexMatcher::followingGCBoundary(int64_t pos, UErrorCode &status) {
int64_t result = pos;
#if UCONFIG_NO_BREAK_ITERATION==0
// Note: this point will never be reached if break iteration is configured out.
// Regex patterns that would require this function will fail to compile.
// If we haven't yet created a break iterator for this matcher, do it now.
if (fGCBreakItr == nullptr) {
fGCBreakItr = BreakIterator::createCharacterInstance(Locale::getEnglish(), status);
if (U_FAILURE(status)) {
return pos;
}
fGCBreakItr->setText(fInputText, status);
}
result = fGCBreakItr->following(pos);
if (result == BreakIterator::DONE) {
result = pos;
}
#endif
return result;
}
//--------------------------------------------------------------------------------
//
// IncrementTime This function is called once each TIMER_INITIAL_VALUE state
// saves. Increment the "time" counter, and call the
// user callback function if there is one installed.
//
// If the match operation needs to be aborted, either for a time-out
// or because the user callback asked for it, just set an error status.
// The engine will pick that up and stop in its outer loop.
//
//--------------------------------------------------------------------------------
void RegexMatcher::IncrementTime(UErrorCode &status) {
fTickCounter = TIMER_INITIAL_VALUE;
fTime++;
if (fCallbackFn != NULL) {
if ((*fCallbackFn)(fCallbackContext, fTime) == FALSE) {
status = U_REGEX_STOPPED_BY_CALLER;
return;
}
}
if (fTimeLimit > 0 && fTime >= fTimeLimit) {
status = U_REGEX_TIME_OUT;
}
}
//--------------------------------------------------------------------------------
//
// StateSave
// Make a new stack frame, initialized as a copy of the current stack frame.
// Set the pattern index in the original stack frame from the operand value
// in the opcode. Execution of the engine continues with the state in
// the newly created stack frame
//
// Note that reserveBlock() may grow the stack, resulting in the
// whole thing being relocated in memory.
//
// Parameters:
// fp The top frame pointer when called. At return, a new
// fame will be present
// savePatIdx An index into the compiled pattern. Goes into the original
// (not new) frame. If execution ever back-tracks out of the
// new frame, this will be where we continue from in the pattern.
// Return
// The new frame pointer.
//
//--------------------------------------------------------------------------------
inline REStackFrame *RegexMatcher::StateSave(REStackFrame *fp, int64_t savePatIdx, UErrorCode &status) {
if (U_FAILURE(status)) {
return fp;
}
// push storage for a new frame.
int64_t *newFP = fStack->reserveBlock(fFrameSize, status);
if (U_FAILURE(status)) {
// Failure on attempted stack expansion.
// Stack function set some other error code, change it to a more
// specific one for regular expressions.
status = U_REGEX_STACK_OVERFLOW;
// We need to return a writable stack frame, so just return the
// previous frame. The match operation will stop quickly
// because of the error status, after which the frame will never
// be looked at again.
return fp;
}
fp = (REStackFrame *)(newFP - fFrameSize); // in case of realloc of stack.
// New stack frame = copy of old top frame.
int64_t *source = (int64_t *)fp;
int64_t *dest = newFP;
for (;;) {
*dest++ = *source++;
if (source == newFP) {
break;
}
}
fTickCounter--;
if (fTickCounter <= 0) {
IncrementTime(status); // Re-initializes fTickCounter
}
fp->fPatIdx = savePatIdx;
return (REStackFrame *)newFP;
}
#if defined(REGEX_DEBUG)
namespace {
UnicodeString StringFromUText(UText *ut) {
UnicodeString result;
for (UChar32 c = utext_next32From(ut, 0); c != U_SENTINEL; c = UTEXT_NEXT32(ut)) {
result.append(c);
}
return result;
}
}
#endif // REGEX_DEBUG
//--------------------------------------------------------------------------------
//
// MatchAt This is the actual matching engine.
//
// startIdx: begin matching a this index.
// toEnd: if true, match must extend to end of the input region
//
//--------------------------------------------------------------------------------
void RegexMatcher::MatchAt(int64_t startIdx, UBool toEnd, UErrorCode &status) {
UBool isMatch = FALSE; // True if the we have a match.
int64_t backSearchIndex = U_INT64_MAX; // used after greedy single-character matches for searching backwards
int32_t op; // Operation from the compiled pattern, split into
int32_t opType; // the opcode
int32_t opValue; // and the operand value.
#ifdef REGEX_RUN_DEBUG
if (fTraceDebug) {
printf("MatchAt(startIdx=%ld)\n", startIdx);
printf("Original Pattern: \"%s\"\n", CStr(StringFromUText(fPattern->fPattern))());
printf("Input String: \"%s\"\n\n", CStr(StringFromUText(fInputText))());
}
#endif
if (U_FAILURE(status)) {
return;
}
// Cache frequently referenced items from the compiled pattern
//
int64_t *pat = fPattern->fCompiledPat->getBuffer();
const UChar *litText = fPattern->fLiteralText.getBuffer();
UVector *fSets = fPattern->fSets;
fFrameSize = fPattern->fFrameSize;
REStackFrame *fp = resetStack();
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return;
}
fp->fPatIdx = 0;
fp->fInputIdx = startIdx;
// Zero out the pattern's static data
int32_t i;
for (i = 0; i<fPattern->fDataSize; i++) {
fData[i] = 0;
}
//
// Main loop for interpreting the compiled pattern.
// One iteration of the loop per pattern operation performed.
//
for (;;) {
op = (int32_t)pat[fp->fPatIdx];
opType = URX_TYPE(op);
opValue = URX_VAL(op);
#ifdef REGEX_RUN_DEBUG
if (fTraceDebug) {
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
printf("inputIdx=%ld inputChar=%x sp=%3ld activeLimit=%ld ", fp->fInputIdx,
UTEXT_CURRENT32(fInputText), (int64_t *)fp-fStack->getBuffer(), fActiveLimit);
fPattern->dumpOp(fp->fPatIdx);
}
#endif
fp->fPatIdx++;
switch (opType) {
case URX_NOP:
break;
case URX_BACKTRACK:
// Force a backtrack. In some circumstances, the pattern compiler
// will notice that the pattern can't possibly match anything, and will
// emit one of these at that point.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_ONECHAR:
if (fp->fInputIdx < fActiveLimit) {
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
if (c == opValue) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
break;
}
} else {
fHitEnd = TRUE;
}
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_STRING:
{
// Test input against a literal string.
// Strings require two slots in the compiled pattern, one for the
// offset to the string text, and one for the length.
int32_t stringStartIdx = opValue;
op = (int32_t)pat[fp->fPatIdx]; // Fetch the second operand
fp->fPatIdx++;
opType = URX_TYPE(op);
int32_t stringLen = URX_VAL(op);
U_ASSERT(opType == URX_STRING_LEN);
U_ASSERT(stringLen >= 2);
const UChar *patternString = litText+stringStartIdx;
int32_t patternStringIndex = 0;
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 inputChar;
UChar32 patternChar;
UBool success = TRUE;
while (patternStringIndex < stringLen) {
if (UTEXT_GETNATIVEINDEX(fInputText) >= fActiveLimit) {
success = FALSE;
fHitEnd = TRUE;
break;
}
inputChar = UTEXT_NEXT32(fInputText);
U16_NEXT(patternString, patternStringIndex, stringLen, patternChar);
if (patternChar != inputChar) {
success = FALSE;
break;
}
}
if (success) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_STATE_SAVE:
fp = StateSave(fp, opValue, status);
break;
case URX_END:
// The match loop will exit via this path on a successful match,
// when we reach the end of the pattern.
if (toEnd && fp->fInputIdx != fActiveLimit) {
// The pattern matched, but not to the end of input. Try some more.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
isMatch = TRUE;
goto breakFromLoop;
// Start and End Capture stack frame variables are laid out out like this:
// fp->fExtra[opValue] - The start of a completed capture group
// opValue+1 - The end of a completed capture group
// opValue+2 - the start of a capture group whose end
// has not yet been reached (and might not ever be).
case URX_START_CAPTURE:
U_ASSERT(opValue >= 0 && opValue < fFrameSize-3);
fp->fExtra[opValue+2] = fp->fInputIdx;
break;
case URX_END_CAPTURE:
U_ASSERT(opValue >= 0 && opValue < fFrameSize-3);
U_ASSERT(fp->fExtra[opValue+2] >= 0); // Start pos for this group must be set.
fp->fExtra[opValue] = fp->fExtra[opValue+2]; // Tentative start becomes real.
fp->fExtra[opValue+1] = fp->fInputIdx; // End position
U_ASSERT(fp->fExtra[opValue] <= fp->fExtra[opValue+1]);
break;
case URX_DOLLAR: // $, test for End of line
// or for position before new line at end of input
{
if (fp->fInputIdx >= fAnchorLimit) {
// We really are at the end of input. Success.
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
// If we are positioned just before a new-line that is located at the
// end of input, succeed.
UChar32 c = UTEXT_NEXT32(fInputText);
if (UTEXT_GETNATIVEINDEX(fInputText) >= fAnchorLimit) {
if (isLineTerminator(c)) {
// If not in the middle of a CR/LF sequence
if ( !(c==0x0a && fp->fInputIdx>fAnchorStart && ((void)UTEXT_PREVIOUS32(fInputText), UTEXT_PREVIOUS32(fInputText))==0x0d)) {
// At new-line at end of input. Success
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
}
} else {
UChar32 nextC = UTEXT_NEXT32(fInputText);
if (c == 0x0d && nextC == 0x0a && UTEXT_GETNATIVEINDEX(fInputText) >= fAnchorLimit) {
fHitEnd = TRUE;
fRequireEnd = TRUE;
break; // At CR/LF at end of input. Success
}
}
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_DOLLAR_D: // $, test for End of Line, in UNIX_LINES mode.
if (fp->fInputIdx >= fAnchorLimit) {
// Off the end of input. Success.
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
} else {
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
// Either at the last character of input, or off the end.
if (c == 0x0a && UTEXT_GETNATIVEINDEX(fInputText) == fAnchorLimit) {
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
}
// Not at end of input. Back-track out.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_DOLLAR_M: // $, test for End of line in multi-line mode
{
if (fp->fInputIdx >= fAnchorLimit) {
// We really are at the end of input. Success.
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
// If we are positioned just before a new-line, succeed.
// It makes no difference where the new-line is within the input.
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_CURRENT32(fInputText);
if (isLineTerminator(c)) {
// At a line end, except for the odd chance of being in the middle of a CR/LF sequence
// In multi-line mode, hitting a new-line just before the end of input does not
// set the hitEnd or requireEnd flags
if ( !(c==0x0a && fp->fInputIdx>fAnchorStart && UTEXT_PREVIOUS32(fInputText)==0x0d)) {
break;
}
}
// not at a new line. Fail.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_DOLLAR_MD: // $, test for End of line in multi-line and UNIX_LINES mode
{
if (fp->fInputIdx >= fAnchorLimit) {
// We really are at the end of input. Success.
fHitEnd = TRUE;
fRequireEnd = TRUE; // Java set requireEnd in this case, even though
break; // adding a new-line would not lose the match.
}
// If we are not positioned just before a new-line, the test fails; backtrack out.
// It makes no difference where the new-line is within the input.
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
if (UTEXT_CURRENT32(fInputText) != 0x0a) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_CARET: // ^, test for start of line
if (fp->fInputIdx != fAnchorStart) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_CARET_M: // ^, test for start of line in mulit-line mode
{
if (fp->fInputIdx == fAnchorStart) {
// We are at the start input. Success.
break;
}
// Check whether character just before the current pos is a new-line
// unless we are at the end of input
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_PREVIOUS32(fInputText);
if ((fp->fInputIdx < fAnchorLimit) && isLineTerminator(c)) {
// It's a new-line. ^ is true. Success.
// TODO: what should be done with positions between a CR and LF?
break;
}
// Not at the start of a line. Fail.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_CARET_M_UNIX: // ^, test for start of line in mulit-line + Unix-line mode
{
U_ASSERT(fp->fInputIdx >= fAnchorStart);
if (fp->fInputIdx <= fAnchorStart) {
// We are at the start input. Success.
break;
}
// Check whether character just before the current pos is a new-line
U_ASSERT(fp->fInputIdx <= fAnchorLimit);
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_PREVIOUS32(fInputText);
if (c != 0x0a) {
// Not at the start of a line. Back-track out.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_B: // Test for word boundaries
{
UBool success = isWordBoundary(fp->fInputIdx);
success ^= (UBool)(opValue != 0); // flip sense for \B
if (!success) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_BU: // Test for word boundaries, Unicode-style
{
UBool success = isUWordBoundary(fp->fInputIdx, status);
success ^= (UBool)(opValue != 0); // flip sense for \B
if (!success) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_D: // Test for decimal digit
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
int8_t ctype = u_charType(c); // TODO: make a unicode set for this. Will be faster.
UBool success = (ctype == U_DECIMAL_DIGIT_NUMBER);
success ^= (UBool)(opValue != 0); // flip sense for \D
if (success) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_G: // Test for position at end of previous match
if (!((fMatch && fp->fInputIdx==fMatchEnd) || (fMatch==FALSE && fp->fInputIdx==fActiveStart))) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_BACKSLASH_H: // Test for \h, horizontal white space.
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
int8_t ctype = u_charType(c);
UBool success = (ctype == U_SPACE_SEPARATOR || c == 9); // SPACE_SEPARATOR || TAB
success ^= (UBool)(opValue != 0); // flip sense for \H
if (success) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_R: // Test for \R, any line break sequence.
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
if (isLineTerminator(c)) {
if (c == 0x0d && utext_current32(fInputText) == 0x0a) {
utext_next32(fInputText);
}
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_V: // \v, any single line ending character.
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
UBool success = isLineTerminator(c);
success ^= (UBool)(opValue != 0); // flip sense for \V
if (success) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_X:
// Match a Grapheme, as defined by Unicode UAX 29.
// Fail if at end of input
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
fp->fInputIdx = followingGCBoundary(fp->fInputIdx, status);
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp->fInputIdx = fActiveLimit;
}
break;
case URX_BACKSLASH_Z: // Test for end of Input
if (fp->fInputIdx < fAnchorLimit) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
} else {
fHitEnd = TRUE;
fRequireEnd = TRUE;
}
break;
case URX_STATIC_SETREF:
{
// Test input character against one of the predefined sets
// (Word Characters, for example)
// The high bit of the op value is a flag for the match polarity.
// 0: success if input char is in set.
// 1: success if input char is not in set.
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UBool success = ((opValue & URX_NEG_SET) == URX_NEG_SET);
opValue &= ~URX_NEG_SET;
U_ASSERT(opValue > 0 && opValue < URX_LAST_SET);
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
if (c < 256) {
Regex8BitSet &s8 = RegexStaticSets::gStaticSets->fPropSets8[opValue];
if (s8.contains(c)) {
success = !success;
}
} else {
const UnicodeSet &s = RegexStaticSets::gStaticSets->fPropSets[opValue];
if (s.contains(c)) {
success = !success;
}
}
if (success) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
// the character wasn't in the set.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_STAT_SETREF_N:
{
// Test input character for NOT being a member of one of
// the predefined sets (Word Characters, for example)
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
U_ASSERT(opValue > 0 && opValue < URX_LAST_SET);
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
if (c < 256) {
Regex8BitSet &s8 = RegexStaticSets::gStaticSets->fPropSets8[opValue];
if (s8.contains(c) == FALSE) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
break;
}
} else {
const UnicodeSet &s = RegexStaticSets::gStaticSets->fPropSets[opValue];
if (s.contains(c) == FALSE) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
break;
}
}
// the character wasn't in the set.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_SETREF:
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
} else {
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
// There is input left. Pick up one char and test it for set membership.
UChar32 c = UTEXT_NEXT32(fInputText);
U_ASSERT(opValue > 0 && opValue < fSets->size());
if (c<256) {
Regex8BitSet *s8 = &fPattern->fSets8[opValue];
if (s8->contains(c)) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
break;
}
} else {
UnicodeSet *s = (UnicodeSet *)fSets->elementAt(opValue);
if (s->contains(c)) {
// The character is in the set. A Match.
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
break;
}
}
// the character wasn't in the set.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_DOTANY:
{
// . matches anything, but stops at end-of-line.
if (fp->fInputIdx >= fActiveLimit) {
// At end of input. Match failed. Backtrack out.
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
// There is input left. Advance over one char, unless we've hit end-of-line
UChar32 c = UTEXT_NEXT32(fInputText);
if (isLineTerminator(c)) {
// End of line in normal mode. . does not match.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
}
break;
case URX_DOTANY_ALL:
{
// ., in dot-matches-all (including new lines) mode
if (fp->fInputIdx >= fActiveLimit) {
// At end of input. Match failed. Backtrack out.
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
// There is input left. Advance over one char, except if we are
// at a cr/lf, advance over both of them.
UChar32 c;
c = UTEXT_NEXT32(fInputText);
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
if (c==0x0d && fp->fInputIdx < fActiveLimit) {
// In the case of a CR/LF, we need to advance over both.
UChar32 nextc = UTEXT_CURRENT32(fInputText);
if (nextc == 0x0a) {
(void)UTEXT_NEXT32(fInputText);
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
}
}
}
break;
case URX_DOTANY_UNIX:
{
// '.' operator, matches all, but stops at end-of-line.
// UNIX_LINES mode, so 0x0a is the only recognized line ending.
if (fp->fInputIdx >= fActiveLimit) {
// At end of input. Match failed. Backtrack out.
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
// There is input left. Advance over one char, unless we've hit end-of-line
UChar32 c = UTEXT_NEXT32(fInputText);
if (c == 0x0a) {
// End of line in normal mode. '.' does not match the \n
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
} else {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
}
}
break;
case URX_JMP:
fp->fPatIdx = opValue;
break;
case URX_FAIL:
isMatch = FALSE;
goto breakFromLoop;
case URX_JMP_SAV:
U_ASSERT(opValue < fPattern->fCompiledPat->size());
fp = StateSave(fp, fp->fPatIdx, status); // State save to loc following current
fp->fPatIdx = opValue; // Then JMP.
break;
case URX_JMP_SAV_X:
// This opcode is used with (x)+, when x can match a zero length string.
// Same as JMP_SAV, except conditional on the match having made forward progress.
// Destination of the JMP must be a URX_STO_INP_LOC, from which we get the
// data address of the input position at the start of the loop.
{
U_ASSERT(opValue > 0 && opValue < fPattern->fCompiledPat->size());
int32_t stoOp = (int32_t)pat[opValue-1];
U_ASSERT(URX_TYPE(stoOp) == URX_STO_INP_LOC);
int32_t frameLoc = URX_VAL(stoOp);
U_ASSERT(frameLoc >= 0 && frameLoc < fFrameSize);
int64_t prevInputIdx = fp->fExtra[frameLoc];
U_ASSERT(prevInputIdx <= fp->fInputIdx);
if (prevInputIdx < fp->fInputIdx) {
// The match did make progress. Repeat the loop.
fp = StateSave(fp, fp->fPatIdx, status); // State save to loc following current
fp->fPatIdx = opValue;
fp->fExtra[frameLoc] = fp->fInputIdx;
}
// If the input position did not advance, we do nothing here,
// execution will fall out of the loop.
}
break;
case URX_CTR_INIT:
{
U_ASSERT(opValue >= 0 && opValue < fFrameSize-2);
fp->fExtra[opValue] = 0; // Set the loop counter variable to zero
// Pick up the three extra operands that CTR_INIT has, and
// skip the pattern location counter past
int32_t instrOperandLoc = (int32_t)fp->fPatIdx;
fp->fPatIdx += 3;
int32_t loopLoc = URX_VAL(pat[instrOperandLoc]);
int32_t minCount = (int32_t)pat[instrOperandLoc+1];
int32_t maxCount = (int32_t)pat[instrOperandLoc+2];
U_ASSERT(minCount>=0);
U_ASSERT(maxCount>=minCount || maxCount==-1);
U_ASSERT(loopLoc>=fp->fPatIdx);
if (minCount == 0) {
fp = StateSave(fp, loopLoc+1, status);
}
if (maxCount == -1) {
fp->fExtra[opValue+1] = fp->fInputIdx; // For loop breaking.
} else if (maxCount == 0) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_CTR_LOOP:
{
U_ASSERT(opValue>0 && opValue < fp->fPatIdx-2);
int32_t initOp = (int32_t)pat[opValue];
U_ASSERT(URX_TYPE(initOp) == URX_CTR_INIT);
int64_t *pCounter = &fp->fExtra[URX_VAL(initOp)];
int32_t minCount = (int32_t)pat[opValue+2];
int32_t maxCount = (int32_t)pat[opValue+3];
(*pCounter)++;
if ((uint64_t)*pCounter >= (uint32_t)maxCount && maxCount != -1) {
U_ASSERT(*pCounter == maxCount);
break;
}
if (*pCounter >= minCount) {
if (maxCount == -1) {
// Loop has no hard upper bound.
// Check that it is progressing through the input, break if it is not.
int64_t *pLastInputIdx = &fp->fExtra[URX_VAL(initOp) + 1];
if (fp->fInputIdx == *pLastInputIdx) {
break;
} else {
*pLastInputIdx = fp->fInputIdx;
}
}
fp = StateSave(fp, fp->fPatIdx, status);
} else {
// Increment time-out counter. (StateSave() does it if count >= minCount)
fTickCounter--;
if (fTickCounter <= 0) {
IncrementTime(status); // Re-initializes fTickCounter
}
}
fp->fPatIdx = opValue + 4; // Loop back.
}
break;
case URX_CTR_INIT_NG:
{
// Initialize a non-greedy loop
U_ASSERT(opValue >= 0 && opValue < fFrameSize-2);
fp->fExtra[opValue] = 0; // Set the loop counter variable to zero
// Pick up the three extra operands that CTR_INIT_NG has, and
// skip the pattern location counter past
int32_t instrOperandLoc = (int32_t)fp->fPatIdx;
fp->fPatIdx += 3;
int32_t loopLoc = URX_VAL(pat[instrOperandLoc]);
int32_t minCount = (int32_t)pat[instrOperandLoc+1];
int32_t maxCount = (int32_t)pat[instrOperandLoc+2];
U_ASSERT(minCount>=0);
U_ASSERT(maxCount>=minCount || maxCount==-1);
U_ASSERT(loopLoc>fp->fPatIdx);
if (maxCount == -1) {
fp->fExtra[opValue+1] = fp->fInputIdx; // Save initial input index for loop breaking.
}
if (minCount == 0) {
if (maxCount != 0) {
fp = StateSave(fp, fp->fPatIdx, status);
}
fp->fPatIdx = loopLoc+1; // Continue with stuff after repeated block
}
}
break;
case URX_CTR_LOOP_NG:
{
// Non-greedy {min, max} loops
U_ASSERT(opValue>0 && opValue < fp->fPatIdx-2);
int32_t initOp = (int32_t)pat[opValue];
U_ASSERT(URX_TYPE(initOp) == URX_CTR_INIT_NG);
int64_t *pCounter = &fp->fExtra[URX_VAL(initOp)];
int32_t minCount = (int32_t)pat[opValue+2];
int32_t maxCount = (int32_t)pat[opValue+3];
(*pCounter)++;
if ((uint64_t)*pCounter >= (uint32_t)maxCount && maxCount != -1) {
// The loop has matched the maximum permitted number of times.
// Break out of here with no action. Matching will
// continue with the following pattern.
U_ASSERT(*pCounter == maxCount);
break;
}
if (*pCounter < minCount) {
// We haven't met the minimum number of matches yet.
// Loop back for another one.
fp->fPatIdx = opValue + 4; // Loop back.
// Increment time-out counter. (StateSave() does it if count >= minCount)
fTickCounter--;
if (fTickCounter <= 0) {
IncrementTime(status); // Re-initializes fTickCounter
}
} else {
// We do have the minimum number of matches.
// If there is no upper bound on the loop iterations, check that the input index
// is progressing, and stop the loop if it is not.
if (maxCount == -1) {
int64_t *pLastInputIdx = &fp->fExtra[URX_VAL(initOp) + 1];
if (fp->fInputIdx == *pLastInputIdx) {
break;
}
*pLastInputIdx = fp->fInputIdx;
}
// Loop Continuation: we will fall into the pattern following the loop
// (non-greedy, don't execute loop body first), but first do
// a state save to the top of the loop, so that a match failure
// in the following pattern will try another iteration of the loop.
fp = StateSave(fp, opValue + 4, status);
}
}
break;
case URX_STO_SP:
U_ASSERT(opValue >= 0 && opValue < fPattern->fDataSize);
fData[opValue] = fStack->size();
break;
case URX_LD_SP:
{
U_ASSERT(opValue >= 0 && opValue < fPattern->fDataSize);
int32_t newStackSize = (int32_t)fData[opValue];
U_ASSERT(newStackSize <= fStack->size());
int64_t *newFP = fStack->getBuffer() + newStackSize - fFrameSize;
if (newFP == (int64_t *)fp) {
break;
}
int32_t j;
for (j=0; j<fFrameSize; j++) {
newFP[j] = ((int64_t *)fp)[j];
}
fp = (REStackFrame *)newFP;
fStack->setSize(newStackSize);
}
break;
case URX_BACKREF:
{
U_ASSERT(opValue < fFrameSize);
int64_t groupStartIdx = fp->fExtra[opValue];
int64_t groupEndIdx = fp->fExtra[opValue+1];
U_ASSERT(groupStartIdx <= groupEndIdx);
if (groupStartIdx < 0) {
// This capture group has not participated in the match thus far,
fp = (REStackFrame *)fStack->popFrame(fFrameSize); // FAIL, no match.
break;
}
UTEXT_SETNATIVEINDEX(fAltInputText, groupStartIdx);
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
// Note: if the capture group match was of an empty string the backref
// match succeeds. Verified by testing: Perl matches succeed
// in this case, so we do too.
UBool success = TRUE;
for (;;) {
if (utext_getNativeIndex(fAltInputText) >= groupEndIdx) {
success = TRUE;
break;
}
if (utext_getNativeIndex(fInputText) >= fActiveLimit) {
success = FALSE;
fHitEnd = TRUE;
break;
}
UChar32 captureGroupChar = utext_next32(fAltInputText);
UChar32 inputChar = utext_next32(fInputText);
if (inputChar != captureGroupChar) {
success = FALSE;
break;
}
}
if (success) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKREF_I:
{
U_ASSERT(opValue < fFrameSize);
int64_t groupStartIdx = fp->fExtra[opValue];
int64_t groupEndIdx = fp->fExtra[opValue+1];
U_ASSERT(groupStartIdx <= groupEndIdx);
if (groupStartIdx < 0) {
// This capture group has not participated in the match thus far,
fp = (REStackFrame *)fStack->popFrame(fFrameSize); // FAIL, no match.
break;
}
utext_setNativeIndex(fAltInputText, groupStartIdx);
utext_setNativeIndex(fInputText, fp->fInputIdx);
CaseFoldingUTextIterator captureGroupItr(*fAltInputText);
CaseFoldingUTextIterator inputItr(*fInputText);
// Note: if the capture group match was of an empty string the backref
// match succeeds. Verified by testing: Perl matches succeed
// in this case, so we do too.
UBool success = TRUE;
for (;;) {
if (!captureGroupItr.inExpansion() && utext_getNativeIndex(fAltInputText) >= groupEndIdx) {
success = TRUE;
break;
}
if (!inputItr.inExpansion() && utext_getNativeIndex(fInputText) >= fActiveLimit) {
success = FALSE;
fHitEnd = TRUE;
break;
}
UChar32 captureGroupChar = captureGroupItr.next();
UChar32 inputChar = inputItr.next();
if (inputChar != captureGroupChar) {
success = FALSE;
break;
}
}
if (success && inputItr.inExpansion()) {
// We obtained a match by consuming part of a string obtained from
// case-folding a single code point of the input text.
// This does not count as an overall match.
success = FALSE;
}
if (success) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_STO_INP_LOC:
{
U_ASSERT(opValue >= 0 && opValue < fFrameSize);
fp->fExtra[opValue] = fp->fInputIdx;
}
break;
case URX_JMPX:
{
int32_t instrOperandLoc = (int32_t)fp->fPatIdx;
fp->fPatIdx += 1;
int32_t dataLoc = URX_VAL(pat[instrOperandLoc]);
U_ASSERT(dataLoc >= 0 && dataLoc < fFrameSize);
int64_t savedInputIdx = fp->fExtra[dataLoc];
U_ASSERT(savedInputIdx <= fp->fInputIdx);
if (savedInputIdx < fp->fInputIdx) {
fp->fPatIdx = opValue; // JMP
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize); // FAIL, no progress in loop.
}
}
break;
case URX_LA_START:
{
// Entering a look around block.
// Save Stack Ptr, Input Pos.
U_ASSERT(opValue>=0 && opValue+3<fPattern->fDataSize);
fData[opValue] = fStack->size();
fData[opValue+1] = fp->fInputIdx;
fData[opValue+2] = fActiveStart;
fData[opValue+3] = fActiveLimit;
fActiveStart = fLookStart; // Set the match region change for
fActiveLimit = fLookLimit; // transparent bounds.
}
break;
case URX_LA_END:
{
// Leaving a look-ahead block.
// restore Stack Ptr, Input Pos to positions they had on entry to block.
U_ASSERT(opValue>=0 && opValue+3<fPattern->fDataSize);
int32_t stackSize = fStack->size();
int32_t newStackSize =(int32_t)fData[opValue];
U_ASSERT(stackSize >= newStackSize);
if (stackSize > newStackSize) {
// Copy the current top frame back to the new (cut back) top frame.
// This makes the capture groups from within the look-ahead
// expression available.
int64_t *newFP = fStack->getBuffer() + newStackSize - fFrameSize;
int32_t j;
for (j=0; j<fFrameSize; j++) {
newFP[j] = ((int64_t *)fp)[j];
}
fp = (REStackFrame *)newFP;
fStack->setSize(newStackSize);
}
fp->fInputIdx = fData[opValue+1];
// Restore the active region bounds in the input string; they may have
// been changed because of transparent bounds on a Region.
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
}
break;
case URX_ONECHAR_I:
// Case insensitive one char. The char from the pattern is already case folded.
// Input text is not, but case folding the input can not reduce two or more code
// points to one.
if (fp->fInputIdx < fActiveLimit) {
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 c = UTEXT_NEXT32(fInputText);
if (u_foldCase(c, U_FOLD_CASE_DEFAULT) == opValue) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
break;
}
} else {
fHitEnd = TRUE;
}
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_STRING_I:
{
// Case-insensitive test input against a literal string.
// Strings require two slots in the compiled pattern, one for the
// offset to the string text, and one for the length.
// The compiled string has already been case folded.
{
const UChar *patternString = litText + opValue;
int32_t patternStringIdx = 0;
op = (int32_t)pat[fp->fPatIdx];
fp->fPatIdx++;
opType = URX_TYPE(op);
opValue = URX_VAL(op);
U_ASSERT(opType == URX_STRING_LEN);
int32_t patternStringLen = opValue; // Length of the string from the pattern.
UChar32 cPattern;
UChar32 cText;
UBool success = TRUE;
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
CaseFoldingUTextIterator inputIterator(*fInputText);
while (patternStringIdx < patternStringLen) {
if (!inputIterator.inExpansion() && UTEXT_GETNATIVEINDEX(fInputText) >= fActiveLimit) {
success = FALSE;
fHitEnd = TRUE;
break;
}
U16_NEXT(patternString, patternStringIdx, patternStringLen, cPattern);
cText = inputIterator.next();
if (cText != cPattern) {
success = FALSE;
break;
}
}
if (inputIterator.inExpansion()) {
success = FALSE;
}
if (success) {
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
}
break;
case URX_LB_START:
{
// Entering a look-behind block.
// Save Stack Ptr, Input Pos and active input region.
// TODO: implement transparent bounds. Ticket #6067
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
fData[opValue] = fStack->size();
fData[opValue+1] = fp->fInputIdx;
// Save input string length, then reset to pin any matches to end at
// the current position.
fData[opValue+2] = fActiveStart;
fData[opValue+3] = fActiveLimit;
fActiveStart = fRegionStart;
fActiveLimit = fp->fInputIdx;
// Init the variable containing the start index for attempted matches.
fData[opValue+4] = -1;
}
break;
case URX_LB_CONT:
{
// Positive Look-Behind, at top of loop checking for matches of LB expression
// at all possible input starting positions.
// Fetch the min and max possible match lengths. They are the operands
// of this op in the pattern.
int32_t minML = (int32_t)pat[fp->fPatIdx++];
int32_t maxML = (int32_t)pat[fp->fPatIdx++];
if (!UTEXT_USES_U16(fInputText)) {
// utf-8 fix to maximum match length. The pattern compiler assumes utf-16.
// The max length need not be exact; it just needs to be >= actual maximum.
maxML *= 3;
}
U_ASSERT(minML <= maxML);
U_ASSERT(minML >= 0);
// Fetch (from data) the last input index where a match was attempted.
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
int64_t &lbStartIdx = fData[opValue+4];
if (lbStartIdx < 0) {
// First time through loop.
lbStartIdx = fp->fInputIdx - minML;
if (lbStartIdx > 0) {
// move index to a code point boundary, if it's not on one already.
UTEXT_SETNATIVEINDEX(fInputText, lbStartIdx);
lbStartIdx = UTEXT_GETNATIVEINDEX(fInputText);
}
} else {
// 2nd through nth time through the loop.
// Back up start position for match by one.
if (lbStartIdx == 0) {
(lbStartIdx)--;
} else {
UTEXT_SETNATIVEINDEX(fInputText, lbStartIdx);
(void)UTEXT_PREVIOUS32(fInputText);
lbStartIdx = UTEXT_GETNATIVEINDEX(fInputText);
}
}
if (lbStartIdx < 0 || lbStartIdx < fp->fInputIdx - maxML) {
// We have tried all potential match starting points without
// getting a match. Backtrack out, and out of the
// Look Behind altogether.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
break;
}
// Save state to this URX_LB_CONT op, so failure to match will repeat the loop.
// (successful match will fall off the end of the loop.)
fp = StateSave(fp, fp->fPatIdx-3, status);
fp->fInputIdx = lbStartIdx;
}
break;
case URX_LB_END:
// End of a look-behind block, after a successful match.
{
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
if (fp->fInputIdx != fActiveLimit) {
// The look-behind expression matched, but the match did not
// extend all the way to the point that we are looking behind from.
// FAIL out of here, which will take us back to the LB_CONT, which
// will retry the match starting at another position or fail
// the look-behind altogether, whichever is appropriate.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
// Look-behind match is good. Restore the original input string region,
// which had been truncated to pin the end of the lookbehind match to the
// position being looked-behind.
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
}
break;
case URX_LBN_CONT:
{
// Negative Look-Behind, at top of loop checking for matches of LB expression
// at all possible input starting positions.
// Fetch the extra parameters of this op.
int32_t minML = (int32_t)pat[fp->fPatIdx++];
int32_t maxML = (int32_t)pat[fp->fPatIdx++];
if (!UTEXT_USES_U16(fInputText)) {
// utf-8 fix to maximum match length. The pattern compiler assumes utf-16.
// The max length need not be exact; it just needs to be >= actual maximum.
maxML *= 3;
}
int32_t continueLoc = (int32_t)pat[fp->fPatIdx++];
continueLoc = URX_VAL(continueLoc);
U_ASSERT(minML <= maxML);
U_ASSERT(minML >= 0);
U_ASSERT(continueLoc > fp->fPatIdx);
// Fetch (from data) the last input index where a match was attempted.
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
int64_t &lbStartIdx = fData[opValue+4];
if (lbStartIdx < 0) {
// First time through loop.
lbStartIdx = fp->fInputIdx - minML;
if (lbStartIdx > 0) {
// move index to a code point boundary, if it's not on one already.
UTEXT_SETNATIVEINDEX(fInputText, lbStartIdx);
lbStartIdx = UTEXT_GETNATIVEINDEX(fInputText);
}
} else {
// 2nd through nth time through the loop.
// Back up start position for match by one.
if (lbStartIdx == 0) {
(lbStartIdx)--;
} else {
UTEXT_SETNATIVEINDEX(fInputText, lbStartIdx);
(void)UTEXT_PREVIOUS32(fInputText);
lbStartIdx = UTEXT_GETNATIVEINDEX(fInputText);
}
}
if (lbStartIdx < 0 || lbStartIdx < fp->fInputIdx - maxML) {
// We have tried all potential match starting points without
// getting a match, which means that the negative lookbehind as
// a whole has succeeded. Jump forward to the continue location
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
fp->fPatIdx = continueLoc;
break;
}
// Save state to this URX_LB_CONT op, so failure to match will repeat the loop.
// (successful match will cause a FAIL out of the loop altogether.)
fp = StateSave(fp, fp->fPatIdx-4, status);
fp->fInputIdx = lbStartIdx;
}
break;
case URX_LBN_END:
// End of a negative look-behind block, after a successful match.
{
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
if (fp->fInputIdx != fActiveLimit) {
// The look-behind expression matched, but the match did not
// extend all the way to the point that we are looking behind from.
// FAIL out of here, which will take us back to the LB_CONT, which
// will retry the match starting at another position or succeed
// the look-behind altogether, whichever is appropriate.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
// Look-behind expression matched, which means look-behind test as
// a whole Fails
// Restore the original input string length, which had been truncated
// inorder to pin the end of the lookbehind match
// to the position being looked-behind.
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
// Restore original stack position, discarding any state saved
// by the successful pattern match.
U_ASSERT(opValue>=0 && opValue+1<fPattern->fDataSize);
int32_t newStackSize = (int32_t)fData[opValue];
U_ASSERT(fStack->size() > newStackSize);
fStack->setSize(newStackSize);
// FAIL, which will take control back to someplace
// prior to entering the look-behind test.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_LOOP_SR_I:
// Loop Initialization for the optimized implementation of
// [some character set]*
// This op scans through all matching input.
// The following LOOP_C op emulates stack unwinding if the following pattern fails.
{
U_ASSERT(opValue > 0 && opValue < fSets->size());
Regex8BitSet *s8 = &fPattern->fSets8[opValue];
UnicodeSet *s = (UnicodeSet *)fSets->elementAt(opValue);
// Loop through input, until either the input is exhausted or
// we reach a character that is not a member of the set.
int64_t ix = fp->fInputIdx;
UTEXT_SETNATIVEINDEX(fInputText, ix);
for (;;) {
if (ix >= fActiveLimit) {
fHitEnd = TRUE;
break;
}
UChar32 c = UTEXT_NEXT32(fInputText);
if (c<256) {
if (s8->contains(c) == FALSE) {
break;
}
} else {
if (s->contains(c) == FALSE) {
break;
}
}
ix = UTEXT_GETNATIVEINDEX(fInputText);
}
// If there were no matching characters, skip over the loop altogether.
// The loop doesn't run at all, a * op always succeeds.
if (ix == fp->fInputIdx) {
fp->fPatIdx++; // skip the URX_LOOP_C op.
break;
}
// Peek ahead in the compiled pattern, to the URX_LOOP_C that
// must follow. It's operand is the stack location
// that holds the starting input index for the match of this [set]*
int32_t loopcOp = (int32_t)pat[fp->fPatIdx];
U_ASSERT(URX_TYPE(loopcOp) == URX_LOOP_C);
int32_t stackLoc = URX_VAL(loopcOp);
U_ASSERT(stackLoc >= 0 && stackLoc < fFrameSize);
fp->fExtra[stackLoc] = fp->fInputIdx;
fp->fInputIdx = ix;
// Save State to the URX_LOOP_C op that follows this one,
// so that match failures in the following code will return to there.
// Then bump the pattern idx so the LOOP_C is skipped on the way out of here.
fp = StateSave(fp, fp->fPatIdx, status);
fp->fPatIdx++;
}
break;
case URX_LOOP_DOT_I:
// Loop Initialization for the optimized implementation of .*
// This op scans through all remaining input.
// The following LOOP_C op emulates stack unwinding if the following pattern fails.
{
// Loop through input until the input is exhausted (we reach an end-of-line)
// In DOTALL mode, we can just go straight to the end of the input.
int64_t ix;
if ((opValue & 1) == 1) {
// Dot-matches-All mode. Jump straight to the end of the string.
ix = fActiveLimit;
fHitEnd = TRUE;
} else {
// NOT DOT ALL mode. Line endings do not match '.'
// Scan forward until a line ending or end of input.
ix = fp->fInputIdx;
UTEXT_SETNATIVEINDEX(fInputText, ix);
for (;;) {
if (ix >= fActiveLimit) {
fHitEnd = TRUE;
break;
}
UChar32 c = UTEXT_NEXT32(fInputText);
if ((c & 0x7f) <= 0x29) { // Fast filter of non-new-line-s
if ((c == 0x0a) || // 0x0a is newline in both modes.
(((opValue & 2) == 0) && // IF not UNIX_LINES mode
isLineTerminator(c))) {
// char is a line ending. Exit the scanning loop.
break;
}
}
ix = UTEXT_GETNATIVEINDEX(fInputText);
}
}
// If there were no matching characters, skip over the loop altogether.
// The loop doesn't run at all, a * op always succeeds.
if (ix == fp->fInputIdx) {
fp->fPatIdx++; // skip the URX_LOOP_C op.
break;
}
// Peek ahead in the compiled pattern, to the URX_LOOP_C that
// must follow. It's operand is the stack location
// that holds the starting input index for the match of this .*
int32_t loopcOp = (int32_t)pat[fp->fPatIdx];
U_ASSERT(URX_TYPE(loopcOp) == URX_LOOP_C);
int32_t stackLoc = URX_VAL(loopcOp);
U_ASSERT(stackLoc >= 0 && stackLoc < fFrameSize);
fp->fExtra[stackLoc] = fp->fInputIdx;
fp->fInputIdx = ix;
// Save State to the URX_LOOP_C op that follows this one,
// so that match failures in the following code will return to there.
// Then bump the pattern idx so the LOOP_C is skipped on the way out of here.
fp = StateSave(fp, fp->fPatIdx, status);
fp->fPatIdx++;
}
break;
case URX_LOOP_C:
{
U_ASSERT(opValue>=0 && opValue<fFrameSize);
backSearchIndex = fp->fExtra[opValue];
U_ASSERT(backSearchIndex <= fp->fInputIdx);
if (backSearchIndex == fp->fInputIdx) {
// We've backed up the input idx to the point that the loop started.
// The loop is done. Leave here without saving state.
// Subsequent failures won't come back here.
break;
}
// Set up for the next iteration of the loop, with input index
// backed up by one from the last time through,
// and a state save to this instruction in case the following code fails again.
// (We're going backwards because this loop emulates stack unwinding, not
// the initial scan forward.)
U_ASSERT(fp->fInputIdx > 0);
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
UChar32 prevC = UTEXT_PREVIOUS32(fInputText);
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
UChar32 twoPrevC = UTEXT_PREVIOUS32(fInputText);
if (prevC == 0x0a &&
fp->fInputIdx > backSearchIndex &&
twoPrevC == 0x0d) {
int32_t prevOp = (int32_t)pat[fp->fPatIdx-2];
if (URX_TYPE(prevOp) == URX_LOOP_DOT_I) {
// .*, stepping back over CRLF pair.
fp->fInputIdx = UTEXT_GETNATIVEINDEX(fInputText);
}
}
fp = StateSave(fp, fp->fPatIdx-1, status);
}
break;
default:
// Trouble. The compiled pattern contains an entry with an
// unrecognized type tag.
UPRV_UNREACHABLE_ASSERT;
// Unknown opcode type in opType = URX_TYPE(pat[fp->fPatIdx]). But we have
// reports of this in production code, don't use UPRV_UNREACHABLE_EXIT.
// See ICU-21669.
status = U_INTERNAL_PROGRAM_ERROR;
}
if (U_FAILURE(status)) {
isMatch = FALSE;
break;
}
}
breakFromLoop:
fMatch = isMatch;
if (isMatch) {
fLastMatchEnd = fMatchEnd;
fMatchStart = startIdx;
fMatchEnd = fp->fInputIdx;
}
#ifdef REGEX_RUN_DEBUG
if (fTraceDebug) {
if (isMatch) {
printf("Match. start=%ld end=%ld\n\n", fMatchStart, fMatchEnd);
} else {
printf("No match\n\n");
}
}
#endif
fFrame = fp; // The active stack frame when the engine stopped.
// Contains the capture group results that we need to
// access later.
return;
}
//--------------------------------------------------------------------------------
//
// MatchChunkAt This is the actual matching engine. Like MatchAt, but with the
// assumption that the entire string is available in the UText's
// chunk buffer. For now, that means we can use int32_t indexes,
// except for anything that needs to be saved (like group starts
// and ends).
//
// startIdx: begin matching a this index.
// toEnd: if true, match must extend to end of the input region
//
//--------------------------------------------------------------------------------
void RegexMatcher::MatchChunkAt(int32_t startIdx, UBool toEnd, UErrorCode &status) {
UBool isMatch = FALSE; // True if the we have a match.
int32_t backSearchIndex = INT32_MAX; // used after greedy single-character matches for searching backwards
int32_t op; // Operation from the compiled pattern, split into
int32_t opType; // the opcode
int32_t opValue; // and the operand value.
#ifdef REGEX_RUN_DEBUG
if (fTraceDebug) {
printf("MatchAt(startIdx=%d)\n", startIdx);
printf("Original Pattern: \"%s\"\n", CStr(StringFromUText(fPattern->fPattern))());
printf("Input String: \"%s\"\n\n", CStr(StringFromUText(fInputText))());
}
#endif
if (U_FAILURE(status)) {
return;
}
// Cache frequently referenced items from the compiled pattern
//
int64_t *pat = fPattern->fCompiledPat->getBuffer();
const UChar *litText = fPattern->fLiteralText.getBuffer();
UVector *fSets = fPattern->fSets;
const UChar *inputBuf = fInputText->chunkContents;
fFrameSize = fPattern->fFrameSize;
REStackFrame *fp = resetStack();
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return;
}
fp->fPatIdx = 0;
fp->fInputIdx = startIdx;
// Zero out the pattern's static data
int32_t i;
for (i = 0; i<fPattern->fDataSize; i++) {
fData[i] = 0;
}
//
// Main loop for interpreting the compiled pattern.
// One iteration of the loop per pattern operation performed.
//
for (;;) {
op = (int32_t)pat[fp->fPatIdx];
opType = URX_TYPE(op);
opValue = URX_VAL(op);
#ifdef REGEX_RUN_DEBUG
if (fTraceDebug) {
UTEXT_SETNATIVEINDEX(fInputText, fp->fInputIdx);
printf("inputIdx=%ld inputChar=%x sp=%3ld activeLimit=%ld ", fp->fInputIdx,
UTEXT_CURRENT32(fInputText), (int64_t *)fp-fStack->getBuffer(), fActiveLimit);
fPattern->dumpOp(fp->fPatIdx);
}
#endif
fp->fPatIdx++;
switch (opType) {
case URX_NOP:
break;
case URX_BACKTRACK:
// Force a backtrack. In some circumstances, the pattern compiler
// will notice that the pattern can't possibly match anything, and will
// emit one of these at that point.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_ONECHAR:
if (fp->fInputIdx < fActiveLimit) {
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (c == opValue) {
break;
}
} else {
fHitEnd = TRUE;
}
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_STRING:
{
// Test input against a literal string.
// Strings require two slots in the compiled pattern, one for the
// offset to the string text, and one for the length.
int32_t stringStartIdx = opValue;
int32_t stringLen;
op = (int32_t)pat[fp->fPatIdx]; // Fetch the second operand
fp->fPatIdx++;
opType = URX_TYPE(op);
stringLen = URX_VAL(op);
U_ASSERT(opType == URX_STRING_LEN);
U_ASSERT(stringLen >= 2);
const UChar * pInp = inputBuf + fp->fInputIdx;
const UChar * pInpLimit = inputBuf + fActiveLimit;
const UChar * pPat = litText+stringStartIdx;
const UChar * pEnd = pInp + stringLen;
UBool success = TRUE;
while (pInp < pEnd) {
if (pInp >= pInpLimit) {
fHitEnd = TRUE;
success = FALSE;
break;
}
if (*pInp++ != *pPat++) {
success = FALSE;
break;
}
}
if (success) {
fp->fInputIdx += stringLen;
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_STATE_SAVE:
fp = StateSave(fp, opValue, status);
break;
case URX_END:
// The match loop will exit via this path on a successful match,
// when we reach the end of the pattern.
if (toEnd && fp->fInputIdx != fActiveLimit) {
// The pattern matched, but not to the end of input. Try some more.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
isMatch = TRUE;
goto breakFromLoop;
// Start and End Capture stack frame variables are laid out out like this:
// fp->fExtra[opValue] - The start of a completed capture group
// opValue+1 - The end of a completed capture group
// opValue+2 - the start of a capture group whose end
// has not yet been reached (and might not ever be).
case URX_START_CAPTURE:
U_ASSERT(opValue >= 0 && opValue < fFrameSize-3);
fp->fExtra[opValue+2] = fp->fInputIdx;
break;
case URX_END_CAPTURE:
U_ASSERT(opValue >= 0 && opValue < fFrameSize-3);
U_ASSERT(fp->fExtra[opValue+2] >= 0); // Start pos for this group must be set.
fp->fExtra[opValue] = fp->fExtra[opValue+2]; // Tentative start becomes real.
fp->fExtra[opValue+1] = fp->fInputIdx; // End position
U_ASSERT(fp->fExtra[opValue] <= fp->fExtra[opValue+1]);
break;
case URX_DOLLAR: // $, test for End of line
// or for position before new line at end of input
if (fp->fInputIdx < fAnchorLimit-2) {
// We are no where near the end of input. Fail.
// This is the common case. Keep it first.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
if (fp->fInputIdx >= fAnchorLimit) {
// We really are at the end of input. Success.
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
// If we are positioned just before a new-line that is located at the
// end of input, succeed.
if (fp->fInputIdx == fAnchorLimit-1) {
UChar32 c;
U16_GET(inputBuf, fAnchorStart, fp->fInputIdx, fAnchorLimit, c);
if (isLineTerminator(c)) {
if ( !(c==0x0a && fp->fInputIdx>fAnchorStart && inputBuf[fp->fInputIdx-1]==0x0d)) {
// At new-line at end of input. Success
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
}
} else if (fp->fInputIdx == fAnchorLimit-2 &&
inputBuf[fp->fInputIdx]==0x0d && inputBuf[fp->fInputIdx+1]==0x0a) {
fHitEnd = TRUE;
fRequireEnd = TRUE;
break; // At CR/LF at end of input. Success
}
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_DOLLAR_D: // $, test for End of Line, in UNIX_LINES mode.
if (fp->fInputIdx >= fAnchorLimit-1) {
// Either at the last character of input, or off the end.
if (fp->fInputIdx == fAnchorLimit-1) {
// At last char of input. Success if it's a new line.
if (inputBuf[fp->fInputIdx] == 0x0a) {
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
} else {
// Off the end of input. Success.
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
}
// Not at end of input. Back-track out.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_DOLLAR_M: // $, test for End of line in multi-line mode
{
if (fp->fInputIdx >= fAnchorLimit) {
// We really are at the end of input. Success.
fHitEnd = TRUE;
fRequireEnd = TRUE;
break;
}
// If we are positioned just before a new-line, succeed.
// It makes no difference where the new-line is within the input.
UChar32 c = inputBuf[fp->fInputIdx];
if (isLineTerminator(c)) {
// At a line end, except for the odd chance of being in the middle of a CR/LF sequence
// In multi-line mode, hitting a new-line just before the end of input does not
// set the hitEnd or requireEnd flags
if ( !(c==0x0a && fp->fInputIdx>fAnchorStart && inputBuf[fp->fInputIdx-1]==0x0d)) {
break;
}
}
// not at a new line. Fail.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_DOLLAR_MD: // $, test for End of line in multi-line and UNIX_LINES mode
{
if (fp->fInputIdx >= fAnchorLimit) {
// We really are at the end of input. Success.
fHitEnd = TRUE;
fRequireEnd = TRUE; // Java set requireEnd in this case, even though
break; // adding a new-line would not lose the match.
}
// If we are not positioned just before a new-line, the test fails; backtrack out.
// It makes no difference where the new-line is within the input.
if (inputBuf[fp->fInputIdx] != 0x0a) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_CARET: // ^, test for start of line
if (fp->fInputIdx != fAnchorStart) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_CARET_M: // ^, test for start of line in mulit-line mode
{
if (fp->fInputIdx == fAnchorStart) {
// We are at the start input. Success.
break;
}
// Check whether character just before the current pos is a new-line
// unless we are at the end of input
UChar c = inputBuf[fp->fInputIdx - 1];
if ((fp->fInputIdx < fAnchorLimit) &&
isLineTerminator(c)) {
// It's a new-line. ^ is true. Success.
// TODO: what should be done with positions between a CR and LF?
break;
}
// Not at the start of a line. Fail.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_CARET_M_UNIX: // ^, test for start of line in mulit-line + Unix-line mode
{
U_ASSERT(fp->fInputIdx >= fAnchorStart);
if (fp->fInputIdx <= fAnchorStart) {
// We are at the start input. Success.
break;
}
// Check whether character just before the current pos is a new-line
U_ASSERT(fp->fInputIdx <= fAnchorLimit);
UChar c = inputBuf[fp->fInputIdx - 1];
if (c != 0x0a) {
// Not at the start of a line. Back-track out.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_B: // Test for word boundaries
{
UBool success = isChunkWordBoundary((int32_t)fp->fInputIdx);
success ^= (UBool)(opValue != 0); // flip sense for \B
if (!success) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_BU: // Test for word boundaries, Unicode-style
{
UBool success = isUWordBoundary(fp->fInputIdx, status);
success ^= (UBool)(opValue != 0); // flip sense for \B
if (!success) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_D: // Test for decimal digit
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
int8_t ctype = u_charType(c); // TODO: make a unicode set for this. Will be faster.
UBool success = (ctype == U_DECIMAL_DIGIT_NUMBER);
success ^= (UBool)(opValue != 0); // flip sense for \D
if (!success) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_G: // Test for position at end of previous match
if (!((fMatch && fp->fInputIdx==fMatchEnd) || (fMatch==FALSE && fp->fInputIdx==fActiveStart))) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_BACKSLASH_H: // Test for \h, horizontal white space.
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
int8_t ctype = u_charType(c);
UBool success = (ctype == U_SPACE_SEPARATOR || c == 9); // SPACE_SEPARATOR || TAB
success ^= (UBool)(opValue != 0); // flip sense for \H
if (!success) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_R: // Test for \R, any line break sequence.
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (isLineTerminator(c)) {
if (c == 0x0d && fp->fInputIdx < fActiveLimit) {
// Check for CR/LF sequence. Consume both together when found.
UChar c2;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c2);
if (c2 != 0x0a) {
U16_PREV(inputBuf, 0, fp->fInputIdx, c2);
}
}
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_V: // Any single code point line ending.
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
UBool success = isLineTerminator(c);
success ^= (UBool)(opValue != 0); // flip sense for \V
if (!success) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKSLASH_X:
// Match a Grapheme, as defined by Unicode UAX 29.
// Fail if at end of input
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
fp->fInputIdx = followingGCBoundary(fp->fInputIdx, status);
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp->fInputIdx = fActiveLimit;
}
break;
case URX_BACKSLASH_Z: // Test for end of Input
if (fp->fInputIdx < fAnchorLimit) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
} else {
fHitEnd = TRUE;
fRequireEnd = TRUE;
}
break;
case URX_STATIC_SETREF:
{
// Test input character against one of the predefined sets
// (Word Characters, for example)
// The high bit of the op value is a flag for the match polarity.
// 0: success if input char is in set.
// 1: success if input char is not in set.
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
UBool success = ((opValue & URX_NEG_SET) == URX_NEG_SET);
opValue &= ~URX_NEG_SET;
U_ASSERT(opValue > 0 && opValue < URX_LAST_SET);
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (c < 256) {
Regex8BitSet &s8 = RegexStaticSets::gStaticSets->fPropSets8[opValue];
if (s8.contains(c)) {
success = !success;
}
} else {
const UnicodeSet &s = RegexStaticSets::gStaticSets->fPropSets[opValue];
if (s.contains(c)) {
success = !success;
}
}
if (!success) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_STAT_SETREF_N:
{
// Test input character for NOT being a member of one of
// the predefined sets (Word Characters, for example)
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
U_ASSERT(opValue > 0 && opValue < URX_LAST_SET);
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (c < 256) {
Regex8BitSet &s8 = RegexStaticSets::gStaticSets->fPropSets8[opValue];
if (s8.contains(c) == FALSE) {
break;
}
} else {
const UnicodeSet &s = RegexStaticSets::gStaticSets->fPropSets[opValue];
if (s.contains(c) == FALSE) {
break;
}
}
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_SETREF:
{
if (fp->fInputIdx >= fActiveLimit) {
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
U_ASSERT(opValue > 0 && opValue < fSets->size());
// There is input left. Pick up one char and test it for set membership.
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (c<256) {
Regex8BitSet *s8 = &fPattern->fSets8[opValue];
if (s8->contains(c)) {
// The character is in the set. A Match.
break;
}
} else {
UnicodeSet *s = (UnicodeSet *)fSets->elementAt(opValue);
if (s->contains(c)) {
// The character is in the set. A Match.
break;
}
}
// the character wasn't in the set.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_DOTANY:
{
// . matches anything, but stops at end-of-line.
if (fp->fInputIdx >= fActiveLimit) {
// At end of input. Match failed. Backtrack out.
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
// There is input left. Advance over one char, unless we've hit end-of-line
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (isLineTerminator(c)) {
// End of line in normal mode. . does not match.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
}
break;
case URX_DOTANY_ALL:
{
// . in dot-matches-all (including new lines) mode
if (fp->fInputIdx >= fActiveLimit) {
// At end of input. Match failed. Backtrack out.
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
// There is input left. Advance over one char, except if we are
// at a cr/lf, advance over both of them.
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (c==0x0d && fp->fInputIdx < fActiveLimit) {
// In the case of a CR/LF, we need to advance over both.
if (inputBuf[fp->fInputIdx] == 0x0a) {
U16_FWD_1(inputBuf, fp->fInputIdx, fActiveLimit);
}
}
}
break;
case URX_DOTANY_UNIX:
{
// '.' operator, matches all, but stops at end-of-line.
// UNIX_LINES mode, so 0x0a is the only recognized line ending.
if (fp->fInputIdx >= fActiveLimit) {
// At end of input. Match failed. Backtrack out.
fHitEnd = TRUE;
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
// There is input left. Advance over one char, unless we've hit end-of-line
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (c == 0x0a) {
// End of line in normal mode. '.' does not match the \n
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_JMP:
fp->fPatIdx = opValue;
break;
case URX_FAIL:
isMatch = FALSE;
goto breakFromLoop;
case URX_JMP_SAV:
U_ASSERT(opValue < fPattern->fCompiledPat->size());
fp = StateSave(fp, fp->fPatIdx, status); // State save to loc following current
fp->fPatIdx = opValue; // Then JMP.
break;
case URX_JMP_SAV_X:
// This opcode is used with (x)+, when x can match a zero length string.
// Same as JMP_SAV, except conditional on the match having made forward progress.
// Destination of the JMP must be a URX_STO_INP_LOC, from which we get the
// data address of the input position at the start of the loop.
{
U_ASSERT(opValue > 0 && opValue < fPattern->fCompiledPat->size());
int32_t stoOp = (int32_t)pat[opValue-1];
U_ASSERT(URX_TYPE(stoOp) == URX_STO_INP_LOC);
int32_t frameLoc = URX_VAL(stoOp);
U_ASSERT(frameLoc >= 0 && frameLoc < fFrameSize);
int32_t prevInputIdx = (int32_t)fp->fExtra[frameLoc];
U_ASSERT(prevInputIdx <= fp->fInputIdx);
if (prevInputIdx < fp->fInputIdx) {
// The match did make progress. Repeat the loop.
fp = StateSave(fp, fp->fPatIdx, status); // State save to loc following current
fp->fPatIdx = opValue;
fp->fExtra[frameLoc] = fp->fInputIdx;
}
// If the input position did not advance, we do nothing here,
// execution will fall out of the loop.
}
break;
case URX_CTR_INIT:
{
U_ASSERT(opValue >= 0 && opValue < fFrameSize-2);
fp->fExtra[opValue] = 0; // Set the loop counter variable to zero
// Pick up the three extra operands that CTR_INIT has, and
// skip the pattern location counter past
int32_t instrOperandLoc = (int32_t)fp->fPatIdx;
fp->fPatIdx += 3;
int32_t loopLoc = URX_VAL(pat[instrOperandLoc]);
int32_t minCount = (int32_t)pat[instrOperandLoc+1];
int32_t maxCount = (int32_t)pat[instrOperandLoc+2];
U_ASSERT(minCount>=0);
U_ASSERT(maxCount>=minCount || maxCount==-1);
U_ASSERT(loopLoc>=fp->fPatIdx);
if (minCount == 0) {
fp = StateSave(fp, loopLoc+1, status);
}
if (maxCount == -1) {
fp->fExtra[opValue+1] = fp->fInputIdx; // For loop breaking.
} else if (maxCount == 0) {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_CTR_LOOP:
{
U_ASSERT(opValue>0 && opValue < fp->fPatIdx-2);
int32_t initOp = (int32_t)pat[opValue];
U_ASSERT(URX_TYPE(initOp) == URX_CTR_INIT);
int64_t *pCounter = &fp->fExtra[URX_VAL(initOp)];
int32_t minCount = (int32_t)pat[opValue+2];
int32_t maxCount = (int32_t)pat[opValue+3];
(*pCounter)++;
if ((uint64_t)*pCounter >= (uint32_t)maxCount && maxCount != -1) {
U_ASSERT(*pCounter == maxCount);
break;
}
if (*pCounter >= minCount) {
if (maxCount == -1) {
// Loop has no hard upper bound.
// Check that it is progressing through the input, break if it is not.
int64_t *pLastInputIdx = &fp->fExtra[URX_VAL(initOp) + 1];
if (fp->fInputIdx == *pLastInputIdx) {
break;
} else {
*pLastInputIdx = fp->fInputIdx;
}
}
fp = StateSave(fp, fp->fPatIdx, status);
} else {
// Increment time-out counter. (StateSave() does it if count >= minCount)
fTickCounter--;
if (fTickCounter <= 0) {
IncrementTime(status); // Re-initializes fTickCounter
}
}
fp->fPatIdx = opValue + 4; // Loop back.
}
break;
case URX_CTR_INIT_NG:
{
// Initialize a non-greedy loop
U_ASSERT(opValue >= 0 && opValue < fFrameSize-2);
fp->fExtra[opValue] = 0; // Set the loop counter variable to zero
// Pick up the three extra operands that CTR_INIT_NG has, and
// skip the pattern location counter past
int32_t instrOperandLoc = (int32_t)fp->fPatIdx;
fp->fPatIdx += 3;
int32_t loopLoc = URX_VAL(pat[instrOperandLoc]);
int32_t minCount = (int32_t)pat[instrOperandLoc+1];
int32_t maxCount = (int32_t)pat[instrOperandLoc+2];
U_ASSERT(minCount>=0);
U_ASSERT(maxCount>=minCount || maxCount==-1);
U_ASSERT(loopLoc>fp->fPatIdx);
if (maxCount == -1) {
fp->fExtra[opValue+1] = fp->fInputIdx; // Save initial input index for loop breaking.
}
if (minCount == 0) {
if (maxCount != 0) {
fp = StateSave(fp, fp->fPatIdx, status);
}
fp->fPatIdx = loopLoc+1; // Continue with stuff after repeated block
}
}
break;
case URX_CTR_LOOP_NG:
{
// Non-greedy {min, max} loops
U_ASSERT(opValue>0 && opValue < fp->fPatIdx-2);
int32_t initOp = (int32_t)pat[opValue];
U_ASSERT(URX_TYPE(initOp) == URX_CTR_INIT_NG);
int64_t *pCounter = &fp->fExtra[URX_VAL(initOp)];
int32_t minCount = (int32_t)pat[opValue+2];
int32_t maxCount = (int32_t)pat[opValue+3];
(*pCounter)++;
if ((uint64_t)*pCounter >= (uint32_t)maxCount && maxCount != -1) {
// The loop has matched the maximum permitted number of times.
// Break out of here with no action. Matching will
// continue with the following pattern.
U_ASSERT(*pCounter == maxCount);
break;
}
if (*pCounter < minCount) {
// We haven't met the minimum number of matches yet.
// Loop back for another one.
fp->fPatIdx = opValue + 4; // Loop back.
fTickCounter--;
if (fTickCounter <= 0) {
IncrementTime(status); // Re-initializes fTickCounter
}
} else {
// We do have the minimum number of matches.
// If there is no upper bound on the loop iterations, check that the input index
// is progressing, and stop the loop if it is not.
if (maxCount == -1) {
int64_t *pLastInputIdx = &fp->fExtra[URX_VAL(initOp) + 1];
if (fp->fInputIdx == *pLastInputIdx) {
break;
}
*pLastInputIdx = fp->fInputIdx;
}
// Loop Continuation: we will fall into the pattern following the loop
// (non-greedy, don't execute loop body first), but first do
// a state save to the top of the loop, so that a match failure
// in the following pattern will try another iteration of the loop.
fp = StateSave(fp, opValue + 4, status);
}
}
break;
case URX_STO_SP:
U_ASSERT(opValue >= 0 && opValue < fPattern->fDataSize);
fData[opValue] = fStack->size();
break;
case URX_LD_SP:
{
U_ASSERT(opValue >= 0 && opValue < fPattern->fDataSize);
int32_t newStackSize = (int32_t)fData[opValue];
U_ASSERT(newStackSize <= fStack->size());
int64_t *newFP = fStack->getBuffer() + newStackSize - fFrameSize;
if (newFP == (int64_t *)fp) {
break;
}
int32_t j;
for (j=0; j<fFrameSize; j++) {
newFP[j] = ((int64_t *)fp)[j];
}
fp = (REStackFrame *)newFP;
fStack->setSize(newStackSize);
}
break;
case URX_BACKREF:
{
U_ASSERT(opValue < fFrameSize);
int64_t groupStartIdx = fp->fExtra[opValue];
int64_t groupEndIdx = fp->fExtra[opValue+1];
U_ASSERT(groupStartIdx <= groupEndIdx);
int64_t inputIndex = fp->fInputIdx;
if (groupStartIdx < 0) {
// This capture group has not participated in the match thus far,
fp = (REStackFrame *)fStack->popFrame(fFrameSize); // FAIL, no match.
break;
}
UBool success = TRUE;
for (int64_t groupIndex = groupStartIdx; groupIndex < groupEndIdx; ++groupIndex,++inputIndex) {
if (inputIndex >= fActiveLimit) {
success = FALSE;
fHitEnd = TRUE;
break;
}
if (inputBuf[groupIndex] != inputBuf[inputIndex]) {
success = FALSE;
break;
}
}
if (success && groupStartIdx < groupEndIdx && U16_IS_LEAD(inputBuf[groupEndIdx-1]) &&
inputIndex < fActiveLimit && U16_IS_TRAIL(inputBuf[inputIndex])) {
// Capture group ended with an unpaired lead surrogate.
// Back reference is not permitted to match lead only of a surrogatge pair.
success = FALSE;
}
if (success) {
fp->fInputIdx = inputIndex;
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_BACKREF_I:
{
U_ASSERT(opValue < fFrameSize);
int64_t groupStartIdx = fp->fExtra[opValue];
int64_t groupEndIdx = fp->fExtra[opValue+1];
U_ASSERT(groupStartIdx <= groupEndIdx);
if (groupStartIdx < 0) {
// This capture group has not participated in the match thus far,
fp = (REStackFrame *)fStack->popFrame(fFrameSize); // FAIL, no match.
break;
}
CaseFoldingUCharIterator captureGroupItr(inputBuf, groupStartIdx, groupEndIdx);
CaseFoldingUCharIterator inputItr(inputBuf, fp->fInputIdx, fActiveLimit);
// Note: if the capture group match was of an empty string the backref
// match succeeds. Verified by testing: Perl matches succeed
// in this case, so we do too.
UBool success = TRUE;
for (;;) {
UChar32 captureGroupChar = captureGroupItr.next();
if (captureGroupChar == U_SENTINEL) {
success = TRUE;
break;
}
UChar32 inputChar = inputItr.next();
if (inputChar == U_SENTINEL) {
success = FALSE;
fHitEnd = TRUE;
break;
}
if (inputChar != captureGroupChar) {
success = FALSE;
break;
}
}
if (success && inputItr.inExpansion()) {
// We obtained a match by consuming part of a string obtained from
// case-folding a single code point of the input text.
// This does not count as an overall match.
success = FALSE;
}
if (success) {
fp->fInputIdx = inputItr.getIndex();
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_STO_INP_LOC:
{
U_ASSERT(opValue >= 0 && opValue < fFrameSize);
fp->fExtra[opValue] = fp->fInputIdx;
}
break;
case URX_JMPX:
{
int32_t instrOperandLoc = (int32_t)fp->fPatIdx;
fp->fPatIdx += 1;
int32_t dataLoc = URX_VAL(pat[instrOperandLoc]);
U_ASSERT(dataLoc >= 0 && dataLoc < fFrameSize);
int32_t savedInputIdx = (int32_t)fp->fExtra[dataLoc];
U_ASSERT(savedInputIdx <= fp->fInputIdx);
if (savedInputIdx < fp->fInputIdx) {
fp->fPatIdx = opValue; // JMP
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize); // FAIL, no progress in loop.
}
}
break;
case URX_LA_START:
{
// Entering a look around block.
// Save Stack Ptr, Input Pos.
U_ASSERT(opValue>=0 && opValue+3<fPattern->fDataSize);
fData[opValue] = fStack->size();
fData[opValue+1] = fp->fInputIdx;
fData[opValue+2] = fActiveStart;
fData[opValue+3] = fActiveLimit;
fActiveStart = fLookStart; // Set the match region change for
fActiveLimit = fLookLimit; // transparent bounds.
}
break;
case URX_LA_END:
{
// Leaving a look around block.
// restore Stack Ptr, Input Pos to positions they had on entry to block.
U_ASSERT(opValue>=0 && opValue+3<fPattern->fDataSize);
int32_t stackSize = fStack->size();
int32_t newStackSize = (int32_t)fData[opValue];
U_ASSERT(stackSize >= newStackSize);
if (stackSize > newStackSize) {
// Copy the current top frame back to the new (cut back) top frame.
// This makes the capture groups from within the look-ahead
// expression available.
int64_t *newFP = fStack->getBuffer() + newStackSize - fFrameSize;
int32_t j;
for (j=0; j<fFrameSize; j++) {
newFP[j] = ((int64_t *)fp)[j];
}
fp = (REStackFrame *)newFP;
fStack->setSize(newStackSize);
}
fp->fInputIdx = fData[opValue+1];
// Restore the active region bounds in the input string; they may have
// been changed because of transparent bounds on a Region.
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
}
break;
case URX_ONECHAR_I:
if (fp->fInputIdx < fActiveLimit) {
UChar32 c;
U16_NEXT(inputBuf, fp->fInputIdx, fActiveLimit, c);
if (u_foldCase(c, U_FOLD_CASE_DEFAULT) == opValue) {
break;
}
} else {
fHitEnd = TRUE;
}
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
case URX_STRING_I:
// Case-insensitive test input against a literal string.
// Strings require two slots in the compiled pattern, one for the
// offset to the string text, and one for the length.
// The compiled string has already been case folded.
{
const UChar *patternString = litText + opValue;
op = (int32_t)pat[fp->fPatIdx];
fp->fPatIdx++;
opType = URX_TYPE(op);
opValue = URX_VAL(op);
U_ASSERT(opType == URX_STRING_LEN);
int32_t patternStringLen = opValue; // Length of the string from the pattern.
UChar32 cText;
UChar32 cPattern;
UBool success = TRUE;
int32_t patternStringIdx = 0;
CaseFoldingUCharIterator inputIterator(inputBuf, fp->fInputIdx, fActiveLimit);
while (patternStringIdx < patternStringLen) {
U16_NEXT(patternString, patternStringIdx, patternStringLen, cPattern);
cText = inputIterator.next();
if (cText != cPattern) {
success = FALSE;
if (cText == U_SENTINEL) {
fHitEnd = TRUE;
}
break;
}
}
if (inputIterator.inExpansion()) {
success = FALSE;
}
if (success) {
fp->fInputIdx = inputIterator.getIndex();
} else {
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
}
break;
case URX_LB_START:
{
// Entering a look-behind block.
// Save Stack Ptr, Input Pos and active input region.
// TODO: implement transparent bounds. Ticket #6067
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
fData[opValue] = fStack->size();
fData[opValue+1] = fp->fInputIdx;
// Save input string length, then reset to pin any matches to end at
// the current position.
fData[opValue+2] = fActiveStart;
fData[opValue+3] = fActiveLimit;
fActiveStart = fRegionStart;
fActiveLimit = fp->fInputIdx;
// Init the variable containing the start index for attempted matches.
fData[opValue+4] = -1;
}
break;
case URX_LB_CONT:
{
// Positive Look-Behind, at top of loop checking for matches of LB expression
// at all possible input starting positions.
// Fetch the min and max possible match lengths. They are the operands
// of this op in the pattern.
int32_t minML = (int32_t)pat[fp->fPatIdx++];
int32_t maxML = (int32_t)pat[fp->fPatIdx++];
U_ASSERT(minML <= maxML);
U_ASSERT(minML >= 0);
// Fetch (from data) the last input index where a match was attempted.
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
int64_t &lbStartIdx = fData[opValue+4];
if (lbStartIdx < 0) {
// First time through loop.
lbStartIdx = fp->fInputIdx - minML;
if (lbStartIdx > 0 && lbStartIdx < fInputLength) {
U16_SET_CP_START(inputBuf, 0, lbStartIdx);
}
} else {
// 2nd through nth time through the loop.
// Back up start position for match by one.
if (lbStartIdx == 0) {
lbStartIdx--;
} else {
U16_BACK_1(inputBuf, 0, lbStartIdx);
}
}
if (lbStartIdx < 0 || lbStartIdx < fp->fInputIdx - maxML) {
// We have tried all potential match starting points without
// getting a match. Backtrack out, and out of the
// Look Behind altogether.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
break;
}
// Save state to this URX_LB_CONT op, so failure to match will repeat the loop.
// (successful match will fall off the end of the loop.)
fp = StateSave(fp, fp->fPatIdx-3, status);
fp->fInputIdx = lbStartIdx;
}
break;
case URX_LB_END:
// End of a look-behind block, after a successful match.
{
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
if (fp->fInputIdx != fActiveLimit) {
// The look-behind expression matched, but the match did not
// extend all the way to the point that we are looking behind from.
// FAIL out of here, which will take us back to the LB_CONT, which
// will retry the match starting at another position or fail
// the look-behind altogether, whichever is appropriate.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
// Look-behind match is good. Restore the original input string region,
// which had been truncated to pin the end of the lookbehind match to the
// position being looked-behind.
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
}
break;
case URX_LBN_CONT:
{
// Negative Look-Behind, at top of loop checking for matches of LB expression
// at all possible input starting positions.
// Fetch the extra parameters of this op.
int32_t minML = (int32_t)pat[fp->fPatIdx++];
int32_t maxML = (int32_t)pat[fp->fPatIdx++];
int32_t continueLoc = (int32_t)pat[fp->fPatIdx++];
continueLoc = URX_VAL(continueLoc);
U_ASSERT(minML <= maxML);
U_ASSERT(minML >= 0);
U_ASSERT(continueLoc > fp->fPatIdx);
// Fetch (from data) the last input index where a match was attempted.
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
int64_t &lbStartIdx = fData[opValue+4];
if (lbStartIdx < 0) {
// First time through loop.
lbStartIdx = fp->fInputIdx - minML;
if (lbStartIdx > 0 && lbStartIdx < fInputLength) {
U16_SET_CP_START(inputBuf, 0, lbStartIdx);
}
} else {
// 2nd through nth time through the loop.
// Back up start position for match by one.
if (lbStartIdx == 0) {
lbStartIdx--; // Because U16_BACK is unsafe starting at 0.
} else {
U16_BACK_1(inputBuf, 0, lbStartIdx);
}
}
if (lbStartIdx < 0 || lbStartIdx < fp->fInputIdx - maxML) {
// We have tried all potential match starting points without
// getting a match, which means that the negative lookbehind as
// a whole has succeeded. Jump forward to the continue location
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
fp->fPatIdx = continueLoc;
break;
}
// Save state to this URX_LB_CONT op, so failure to match will repeat the loop.
// (successful match will cause a FAIL out of the loop altogether.)
fp = StateSave(fp, fp->fPatIdx-4, status);
fp->fInputIdx = lbStartIdx;
}
break;
case URX_LBN_END:
// End of a negative look-behind block, after a successful match.
{
U_ASSERT(opValue>=0 && opValue+4<fPattern->fDataSize);
if (fp->fInputIdx != fActiveLimit) {
// The look-behind expression matched, but the match did not
// extend all the way to the point that we are looking behind from.
// FAIL out of here, which will take us back to the LB_CONT, which
// will retry the match starting at another position or succeed
// the look-behind altogether, whichever is appropriate.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
break;
}
// Look-behind expression matched, which means look-behind test as
// a whole Fails
// Restore the original input string length, which had been truncated
// inorder to pin the end of the lookbehind match
// to the position being looked-behind.
fActiveStart = fData[opValue+2];
fActiveLimit = fData[opValue+3];
U_ASSERT(fActiveStart >= 0);
U_ASSERT(fActiveLimit <= fInputLength);
// Restore original stack position, discarding any state saved
// by the successful pattern match.
U_ASSERT(opValue>=0 && opValue+1<fPattern->fDataSize);
int32_t newStackSize = (int32_t)fData[opValue];
U_ASSERT(fStack->size() > newStackSize);
fStack->setSize(newStackSize);
// FAIL, which will take control back to someplace
// prior to entering the look-behind test.
fp = (REStackFrame *)fStack->popFrame(fFrameSize);
}
break;
case URX_LOOP_SR_I:
// Loop Initialization for the optimized implementation of
// [some character set]*
// This op scans through all matching input.
// The following LOOP_C op emulates stack unwinding if the following pattern fails.
{
U_ASSERT(opValue > 0 && opValue < fSets->size());
Regex8BitSet *s8 = &fPattern->fSets8[opValue];
UnicodeSet *s = (UnicodeSet *)fSets->elementAt(opValue);
// Loop through input, until either the input is exhausted or
// we reach a character that is not a member of the set.
int32_t ix = (int32_t)fp->fInputIdx;
for (;;) {
if (ix >= fActiveLimit) {
fHitEnd = TRUE;
break;
}
UChar32 c;
U16_NEXT(inputBuf, ix, fActiveLimit, c);
if (c<256) {
if (s8->contains(c) == FALSE) {
U16_BACK_1(inputBuf, 0, ix);
break;
}
} else {
if (s->contains(c) == FALSE) {
U16_BACK_1(inputBuf, 0, ix);
break;
}
}
}
// If there were no matching characters, skip over the loop altogether.
// The loop doesn't run at all, a * op always succeeds.
if (ix == fp->fInputIdx) {
fp->fPatIdx++; // skip the URX_LOOP_C op.
break;
}
// Peek ahead in the compiled pattern, to the URX_LOOP_C that
// must follow. It's operand is the stack location
// that holds the starting input index for the match of this [set]*
int32_t loopcOp = (int32_t)pat[fp->fPatIdx];
U_ASSERT(URX_TYPE(loopcOp) == URX_LOOP_C);
int32_t stackLoc = URX_VAL(loopcOp);
U_ASSERT(stackLoc >= 0 && stackLoc < fFrameSize);
fp->fExtra[stackLoc] = fp->fInputIdx;
fp->fInputIdx = ix;
// Save State to the URX_LOOP_C op that follows this one,
// so that match failures in the following code will return to there.
// Then bump the pattern idx so the LOOP_C is skipped on the way out of here.
fp = StateSave(fp, fp->fPatIdx, status);
fp->fPatIdx++;
}
break;
case URX_LOOP_DOT_I:
// Loop Initialization for the optimized implementation of .*
// This op scans through all remaining input.
// The following LOOP_C op emulates stack unwinding if the following pattern fails.
{
// Loop through input until the input is exhausted (we reach an end-of-line)
// In DOTALL mode, we can just go straight to the end of the input.
int32_t ix;
if ((opValue & 1) == 1) {
// Dot-matches-All mode. Jump straight to the end of the string.
ix = (int32_t)fActiveLimit;
fHitEnd = TRUE;
} else {
// NOT DOT ALL mode. Line endings do not match '.'
// Scan forward until a line ending or end of input.
ix = (int32_t)fp->fInputIdx;
for (;;) {
if (ix >= fActiveLimit) {
fHitEnd = TRUE;
break;
}
UChar32 c;
U16_NEXT(inputBuf, ix, fActiveLimit, c); // c = inputBuf[ix++]
if ((c & 0x7f) <= 0x29) { // Fast filter of non-new-line-s
if ((c == 0x0a) || // 0x0a is newline in both modes.
(((opValue & 2) == 0) && // IF not UNIX_LINES mode
isLineTerminator(c))) {
// char is a line ending. Put the input pos back to the
// line ending char, and exit the scanning loop.
U16_BACK_1(inputBuf, 0, ix);
break;
}
}
}
}
// If there were no matching characters, skip over the loop altogether.
// The loop doesn't run at all, a * op always succeeds.
if (ix == fp->fInputIdx) {
fp->fPatIdx++; // skip the URX_LOOP_C op.
break;
}
// Peek ahead in the compiled pattern, to the URX_LOOP_C that
// must follow. It's operand is the stack location
// that holds the starting input index for the match of this .*
int32_t loopcOp = (int32_t)pat[fp->fPatIdx];
U_ASSERT(URX_TYPE(loopcOp) == URX_LOOP_C);
int32_t stackLoc = URX_VAL(loopcOp);
U_ASSERT(stackLoc >= 0 && stackLoc < fFrameSize);
fp->fExtra[stackLoc] = fp->fInputIdx;
fp->fInputIdx = ix;
// Save State to the URX_LOOP_C op that follows this one,
// so that match failures in the following code will return to there.
// Then bump the pattern idx so the LOOP_C is skipped on the way out of here.
fp = StateSave(fp, fp->fPatIdx, status);
fp->fPatIdx++;
}
break;
case URX_LOOP_C:
{
U_ASSERT(opValue>=0 && opValue<fFrameSize);
backSearchIndex = (int32_t)fp->fExtra[opValue];
U_ASSERT(backSearchIndex <= fp->fInputIdx);
if (backSearchIndex == fp->fInputIdx) {
// We've backed up the input idx to the point that the loop started.
// The loop is done. Leave here without saving state.
// Subsequent failures won't come back here.
break;
}
// Set up for the next iteration of the loop, with input index
// backed up by one from the last time through,
// and a state save to this instruction in case the following code fails again.
// (We're going backwards because this loop emulates stack unwinding, not
// the initial scan forward.)
U_ASSERT(fp->fInputIdx > 0);
UChar32 prevC;
U16_PREV(inputBuf, 0, fp->fInputIdx, prevC); // !!!: should this 0 be one of f*Limit?
if (prevC == 0x0a &&
fp->fInputIdx > backSearchIndex &&
inputBuf[fp->fInputIdx-1] == 0x0d) {
int32_t prevOp = (int32_t)pat[fp->fPatIdx-2];
if (URX_TYPE(prevOp) == URX_LOOP_DOT_I) {
// .*, stepping back over CRLF pair.
U16_BACK_1(inputBuf, 0, fp->fInputIdx);
}
}
fp = StateSave(fp, fp->fPatIdx-1, status);
}
break;
default:
// Trouble. The compiled pattern contains an entry with an
// unrecognized type tag.
UPRV_UNREACHABLE_ASSERT;
// Unknown opcode type in opType = URX_TYPE(pat[fp->fPatIdx]). But we have
// reports of this in production code, don't use UPRV_UNREACHABLE_EXIT.
// See ICU-21669.
status = U_INTERNAL_PROGRAM_ERROR;
}
if (U_FAILURE(status)) {
isMatch = FALSE;
break;
}
}
breakFromLoop:
fMatch = isMatch;
if (isMatch) {
fLastMatchEnd = fMatchEnd;
fMatchStart = startIdx;
fMatchEnd = fp->fInputIdx;
}
#ifdef REGEX_RUN_DEBUG
if (fTraceDebug) {
if (isMatch) {
printf("Match. start=%ld end=%ld\n\n", fMatchStart, fMatchEnd);
} else {
printf("No match\n\n");
}
}
#endif
fFrame = fp; // The active stack frame when the engine stopped.
// Contains the capture group results that we need to
// access later.
return;
}
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RegexMatcher)
U_NAMESPACE_END
#endif // !UCONFIG_NO_REGULAR_EXPRESSIONS
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