460 lines
17 KiB
C++
460 lines
17 KiB
C++
// © 2018 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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// Allow implicit conversion from char16_t* to UnicodeString for this file:
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// Helpful in toString methods and elsewhere.
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#define UNISTR_FROM_STRING_EXPLICIT
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#include "numparse_types.h"
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#include "numparse_decimal.h"
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#include "static_unicode_sets.h"
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#include "numparse_utils.h"
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#include "unicode/uchar.h"
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#include "putilimp.h"
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#include "number_decimalquantity.h"
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#include "string_segment.h"
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using namespace icu;
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using namespace icu::numparse;
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using namespace icu::numparse::impl;
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DecimalMatcher::DecimalMatcher(const DecimalFormatSymbols& symbols, const Grouper& grouper,
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parse_flags_t parseFlags) {
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if (0 != (parseFlags & PARSE_FLAG_MONETARY_SEPARATORS)) {
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groupingSeparator = symbols.getConstSymbol(DecimalFormatSymbols::kMonetaryGroupingSeparatorSymbol);
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decimalSeparator = symbols.getConstSymbol(DecimalFormatSymbols::kMonetarySeparatorSymbol);
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} else {
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groupingSeparator = symbols.getConstSymbol(DecimalFormatSymbols::kGroupingSeparatorSymbol);
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decimalSeparator = symbols.getConstSymbol(DecimalFormatSymbols::kDecimalSeparatorSymbol);
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}
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bool strictSeparators = 0 != (parseFlags & PARSE_FLAG_STRICT_SEPARATORS);
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unisets::Key groupingKey = strictSeparators ? unisets::STRICT_ALL_SEPARATORS
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: unisets::ALL_SEPARATORS;
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// Attempt to find separators in the static cache
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groupingUniSet = unisets::get(groupingKey);
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unisets::Key decimalKey = unisets::chooseFrom(
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decimalSeparator,
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strictSeparators ? unisets::STRICT_COMMA : unisets::COMMA,
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strictSeparators ? unisets::STRICT_PERIOD : unisets::PERIOD);
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if (decimalKey >= 0) {
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decimalUniSet = unisets::get(decimalKey);
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} else if (!decimalSeparator.isEmpty()) {
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auto* set = new UnicodeSet();
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set->add(decimalSeparator.char32At(0));
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set->freeze();
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decimalUniSet = set;
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fLocalDecimalUniSet.adoptInstead(set);
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} else {
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decimalUniSet = unisets::get(unisets::EMPTY);
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}
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if (groupingKey >= 0 && decimalKey >= 0) {
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// Everything is available in the static cache
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separatorSet = groupingUniSet;
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leadSet = unisets::get(
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strictSeparators ? unisets::DIGITS_OR_ALL_SEPARATORS
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: unisets::DIGITS_OR_STRICT_ALL_SEPARATORS);
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} else {
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auto* set = new UnicodeSet();
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set->addAll(*groupingUniSet);
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set->addAll(*decimalUniSet);
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set->freeze();
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separatorSet = set;
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fLocalSeparatorSet.adoptInstead(set);
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leadSet = nullptr;
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}
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UChar32 cpZero = symbols.getCodePointZero();
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if (cpZero == -1 || !u_isdigit(cpZero) || u_digit(cpZero, 10) != 0) {
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// Uncommon case: okay to allocate.
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auto digitStrings = new UnicodeString[10];
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fLocalDigitStrings.adoptInstead(digitStrings);
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for (int32_t i = 0; i <= 9; i++) {
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digitStrings[i] = symbols.getConstDigitSymbol(i);
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}
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}
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requireGroupingMatch = 0 != (parseFlags & PARSE_FLAG_STRICT_GROUPING_SIZE);
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groupingDisabled = 0 != (parseFlags & PARSE_FLAG_GROUPING_DISABLED);
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integerOnly = 0 != (parseFlags & PARSE_FLAG_INTEGER_ONLY);
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grouping1 = grouper.getPrimary();
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grouping2 = grouper.getSecondary();
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// Fraction grouping parsing is disabled for now but could be enabled later.
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// See https://unicode-org.atlassian.net/browse/ICU-10794
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// fractionGrouping = 0 != (parseFlags & PARSE_FLAG_FRACTION_GROUPING_ENABLED);
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}
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bool DecimalMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const {
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return match(segment, result, 0, status);
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}
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bool DecimalMatcher::match(StringSegment& segment, ParsedNumber& result, int8_t exponentSign,
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UErrorCode&) const {
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if (result.seenNumber() && exponentSign == 0) {
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// A number has already been consumed.
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return false;
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} else if (exponentSign != 0) {
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// scientific notation always comes after the number
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U_ASSERT(!result.quantity.bogus);
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}
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// Initial offset before any character consumption.
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int32_t initialOffset = segment.getOffset();
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// Return value: whether to ask for more characters.
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bool maybeMore = false;
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// All digits consumed so far.
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number::impl::DecimalQuantity digitsConsumed;
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digitsConsumed.bogus = true;
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// The total number of digits after the decimal place, used for scaling the result.
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int32_t digitsAfterDecimalPlace = 0;
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// The actual grouping and decimal separators used in the string.
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// If non-null, we have seen that token.
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UnicodeString actualGroupingString;
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UnicodeString actualDecimalString;
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actualGroupingString.setToBogus();
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actualDecimalString.setToBogus();
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// Information for two groups: the previous group and the current group.
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//
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// Each group has three pieces of information:
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//
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// Offset: the string position of the beginning of the group, including a leading separator
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// if there was a leading separator. This is needed in case we need to rewind the parse to
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// that position.
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//
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// Separator type:
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// 0 => beginning of string
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// 1 => lead separator is a grouping separator
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// 2 => lead separator is a decimal separator
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//
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// Count: the number of digits in the group. If -1, the group has been validated.
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int32_t currGroupOffset = 0;
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int32_t currGroupSepType = 0;
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int32_t currGroupCount = 0;
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int32_t prevGroupOffset = -1;
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int32_t prevGroupSepType = -1;
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int32_t prevGroupCount = -1;
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while (segment.length() > 0) {
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maybeMore = false;
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// Attempt to match a digit.
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int8_t digit = -1;
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// Try by code point digit value.
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UChar32 cp = segment.getCodePoint();
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if (u_isdigit(cp)) {
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segment.adjustOffset(U16_LENGTH(cp));
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digit = static_cast<int8_t>(u_digit(cp, 10));
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}
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// Try by digit string.
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if (digit == -1 && !fLocalDigitStrings.isNull()) {
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for (int32_t i = 0; i < 10; i++) {
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const UnicodeString& str = fLocalDigitStrings[i];
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if (str.isEmpty()) {
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continue;
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}
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int32_t overlap = segment.getCommonPrefixLength(str);
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if (overlap == str.length()) {
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segment.adjustOffset(overlap);
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digit = static_cast<int8_t>(i);
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break;
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}
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maybeMore = maybeMore || (overlap == segment.length());
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}
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}
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if (digit >= 0) {
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// Digit was found.
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if (digitsConsumed.bogus) {
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digitsConsumed.bogus = false;
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digitsConsumed.clear();
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}
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digitsConsumed.appendDigit(digit, 0, true);
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currGroupCount++;
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if (!actualDecimalString.isBogus()) {
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digitsAfterDecimalPlace++;
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}
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continue;
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}
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// Attempt to match a literal grouping or decimal separator.
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bool isDecimal = false;
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bool isGrouping = false;
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// 1) Attempt the decimal separator string literal.
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// if (we have not seen a decimal separator yet) { ... }
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if (actualDecimalString.isBogus() && !decimalSeparator.isEmpty()) {
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int32_t overlap = segment.getCommonPrefixLength(decimalSeparator);
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maybeMore = maybeMore || (overlap == segment.length());
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if (overlap == decimalSeparator.length()) {
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isDecimal = true;
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actualDecimalString = decimalSeparator;
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}
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}
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// 2) Attempt to match the actual grouping string literal.
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if (!actualGroupingString.isBogus()) {
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int32_t overlap = segment.getCommonPrefixLength(actualGroupingString);
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maybeMore = maybeMore || (overlap == segment.length());
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if (overlap == actualGroupingString.length()) {
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isGrouping = true;
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}
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}
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// 2.5) Attempt to match a new the grouping separator string literal.
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// if (we have not seen a grouping or decimal separator yet) { ... }
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if (!groupingDisabled && actualGroupingString.isBogus() && actualDecimalString.isBogus() &&
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!groupingSeparator.isEmpty()) {
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int32_t overlap = segment.getCommonPrefixLength(groupingSeparator);
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maybeMore = maybeMore || (overlap == segment.length());
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if (overlap == groupingSeparator.length()) {
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isGrouping = true;
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actualGroupingString = groupingSeparator;
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}
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}
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// 3) Attempt to match a decimal separator from the equivalence set.
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// if (we have not seen a decimal separator yet) { ... }
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// The !isGrouping is to confirm that we haven't yet matched the current character.
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if (!isGrouping && actualDecimalString.isBogus()) {
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if (decimalUniSet->contains(cp)) {
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isDecimal = true;
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actualDecimalString = UnicodeString(cp);
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}
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}
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// 4) Attempt to match a grouping separator from the equivalence set.
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// if (we have not seen a grouping or decimal separator yet) { ... }
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if (!groupingDisabled && actualGroupingString.isBogus() && actualDecimalString.isBogus()) {
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if (groupingUniSet->contains(cp)) {
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isGrouping = true;
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actualGroupingString = UnicodeString(cp);
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}
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}
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// Leave if we failed to match this as a separator.
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if (!isDecimal && !isGrouping) {
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break;
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}
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// Check for conditions when we don't want to accept the separator.
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if (isDecimal && integerOnly) {
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break;
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} else if (currGroupSepType == 2 && isGrouping) {
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// Fraction grouping
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break;
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}
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// Validate intermediate grouping sizes.
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bool prevValidSecondary = validateGroup(prevGroupSepType, prevGroupCount, false);
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bool currValidPrimary = validateGroup(currGroupSepType, currGroupCount, true);
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if (!prevValidSecondary || (isDecimal && !currValidPrimary)) {
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// Invalid grouping sizes.
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if (isGrouping && currGroupCount == 0) {
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// Trailing grouping separators: these are taken care of below
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U_ASSERT(currGroupSepType == 1);
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} else if (requireGroupingMatch) {
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// Strict mode: reject the parse
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digitsConsumed.clear();
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digitsConsumed.bogus = true;
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}
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break;
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} else if (requireGroupingMatch && currGroupCount == 0 && currGroupSepType == 1) {
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break;
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} else {
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// Grouping sizes OK so far.
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prevGroupOffset = currGroupOffset;
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prevGroupCount = currGroupCount;
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if (isDecimal) {
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// Do not validate this group any more.
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prevGroupSepType = -1;
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} else {
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prevGroupSepType = currGroupSepType;
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}
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}
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// OK to accept the separator.
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// Special case: don't update currGroup if it is empty; this allows two grouping
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// separators in a row in lenient mode.
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if (currGroupCount != 0) {
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currGroupOffset = segment.getOffset();
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}
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currGroupSepType = isGrouping ? 1 : 2;
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currGroupCount = 0;
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if (isGrouping) {
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segment.adjustOffset(actualGroupingString.length());
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} else {
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segment.adjustOffset(actualDecimalString.length());
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}
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}
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// End of main loop.
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// Back up if there was a trailing grouping separator.
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// Shift prev -> curr so we can check it as a final group.
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if (currGroupSepType != 2 && currGroupCount == 0) {
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maybeMore = true;
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segment.setOffset(currGroupOffset);
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currGroupOffset = prevGroupOffset;
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currGroupSepType = prevGroupSepType;
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currGroupCount = prevGroupCount;
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prevGroupOffset = -1;
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prevGroupSepType = 0;
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prevGroupCount = 1;
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}
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// Validate final grouping sizes.
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bool prevValidSecondary = validateGroup(prevGroupSepType, prevGroupCount, false);
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bool currValidPrimary = validateGroup(currGroupSepType, currGroupCount, true);
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if (!requireGroupingMatch) {
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// The cases we need to handle here are lone digits.
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// Examples: "1,1" "1,1," "1,1,1" "1,1,1," ",1" (all parse as 1)
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// See more examples in numberformattestspecification.txt
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int32_t digitsToRemove = 0;
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if (!prevValidSecondary) {
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segment.setOffset(prevGroupOffset);
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digitsToRemove += prevGroupCount;
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digitsToRemove += currGroupCount;
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} else if (!currValidPrimary && (prevGroupSepType != 0 || prevGroupCount != 0)) {
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maybeMore = true;
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segment.setOffset(currGroupOffset);
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digitsToRemove += currGroupCount;
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}
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if (digitsToRemove != 0) {
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digitsConsumed.adjustMagnitude(-digitsToRemove);
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digitsConsumed.truncate();
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}
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prevValidSecondary = true;
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currValidPrimary = true;
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}
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if (currGroupSepType != 2 && (!prevValidSecondary || !currValidPrimary)) {
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// Grouping failure.
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digitsConsumed.bogus = true;
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}
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// Strings that start with a separator but have no digits,
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// or strings that failed a grouping size check.
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if (digitsConsumed.bogus) {
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maybeMore = maybeMore || (segment.length() == 0);
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segment.setOffset(initialOffset);
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return maybeMore;
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}
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// We passed all inspections. Start post-processing.
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// Adjust for fraction part.
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digitsConsumed.adjustMagnitude(-digitsAfterDecimalPlace);
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// Set the digits, either normal or exponent.
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if (exponentSign != 0 && segment.getOffset() != initialOffset) {
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bool overflow = false;
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if (digitsConsumed.fitsInLong()) {
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int64_t exponentLong = digitsConsumed.toLong(false);
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U_ASSERT(exponentLong >= 0);
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if (exponentLong <= INT32_MAX) {
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auto exponentInt = static_cast<int32_t>(exponentLong);
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if (result.quantity.adjustMagnitude(exponentSign * exponentInt)) {
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overflow = true;
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}
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} else {
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overflow = true;
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}
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} else {
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overflow = true;
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}
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if (overflow) {
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if (exponentSign == -1) {
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// Set to zero
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result.quantity.clear();
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} else {
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// Set to infinity
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result.quantity.bogus = true;
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result.flags |= FLAG_INFINITY;
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}
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}
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} else {
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result.quantity = digitsConsumed;
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}
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// Set other information into the result and return.
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if (!actualDecimalString.isBogus()) {
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result.flags |= FLAG_HAS_DECIMAL_SEPARATOR;
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}
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result.setCharsConsumed(segment);
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return segment.length() == 0 || maybeMore;
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}
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bool DecimalMatcher::validateGroup(int32_t sepType, int32_t count, bool isPrimary) const {
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if (requireGroupingMatch) {
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if (sepType == -1) {
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// No such group (prevGroup before first shift).
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return true;
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} else if (sepType == 0) {
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// First group.
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if (isPrimary) {
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// No grouping separators is OK.
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return true;
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} else {
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return count != 0 && count <= grouping2;
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}
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} else if (sepType == 1) {
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// Middle group.
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if (isPrimary) {
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return count == grouping1;
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} else {
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return count == grouping2;
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}
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} else {
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U_ASSERT(sepType == 2);
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// After the decimal separator.
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return true;
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}
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} else {
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if (sepType == 1) {
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// #11230: don't accept middle groups with only 1 digit.
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return count != 1;
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} else {
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return true;
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}
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}
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}
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bool DecimalMatcher::smokeTest(const StringSegment& segment) const {
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// The common case uses a static leadSet for efficiency.
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if (fLocalDigitStrings.isNull() && leadSet != nullptr) {
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return segment.startsWith(*leadSet);
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}
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if (segment.startsWith(*separatorSet) || u_isdigit(segment.getCodePoint())) {
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return true;
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}
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if (fLocalDigitStrings.isNull()) {
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return false;
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}
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for (int32_t i = 0; i < 10; i++) {
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if (segment.startsWith(fLocalDigitStrings[i])) {
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return true;
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}
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}
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return false;
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}
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UnicodeString DecimalMatcher::toString() const {
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return u"<Decimal>";
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}
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#endif /* #if !UCONFIG_NO_FORMATTING */
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