452 lines
17 KiB
C++
452 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_affixes.h"
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#include "numparse_utils.h"
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#include "number_utils.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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using namespace icu::number;
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using namespace icu::number::impl;
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namespace {
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/**
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* Helper method to return whether the given AffixPatternMatcher equals the given pattern string.
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* Either both arguments must be null or the pattern string inside the AffixPatternMatcher must equal
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* the given pattern string.
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*/
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static bool matched(const AffixPatternMatcher* affix, const UnicodeString& patternString) {
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return (affix == nullptr && patternString.isBogus()) ||
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(affix != nullptr && affix->getPattern() == patternString);
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}
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/**
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* Helper method to return the length of the given AffixPatternMatcher. Returns 0 for null.
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*/
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static int32_t length(const AffixPatternMatcher* matcher) {
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return matcher == nullptr ? 0 : matcher->getPattern().length();
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}
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/**
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* Helper method to return whether (1) both lhs and rhs are null/invalid, or (2) if they are both
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* valid, whether they are equal according to operator==. Similar to Java Objects.equals()
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*/
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static bool equals(const AffixPatternMatcher* lhs, const AffixPatternMatcher* rhs) {
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if (lhs == nullptr && rhs == nullptr) {
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return true;
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}
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if (lhs == nullptr || rhs == nullptr) {
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return false;
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}
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return *lhs == *rhs;
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}
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}
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AffixPatternMatcherBuilder::AffixPatternMatcherBuilder(const UnicodeString& pattern,
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AffixTokenMatcherWarehouse& warehouse,
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IgnorablesMatcher* ignorables)
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: fMatchersLen(0),
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fLastTypeOrCp(0),
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fPattern(pattern),
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fWarehouse(warehouse),
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fIgnorables(ignorables) {}
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void AffixPatternMatcherBuilder::consumeToken(AffixPatternType type, UChar32 cp, UErrorCode& status) {
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// This is called by AffixUtils.iterateWithConsumer() for each token.
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// Add an ignorables matcher between tokens except between two literals, and don't put two
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// ignorables matchers in a row.
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if (fIgnorables != nullptr && fMatchersLen > 0 &&
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(fLastTypeOrCp < 0 || !fIgnorables->getSet()->contains(fLastTypeOrCp))) {
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addMatcher(*fIgnorables);
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}
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if (type != TYPE_CODEPOINT) {
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// Case 1: the token is a symbol.
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switch (type) {
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case TYPE_MINUS_SIGN:
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addMatcher(fWarehouse.minusSign());
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break;
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case TYPE_PLUS_SIGN:
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addMatcher(fWarehouse.plusSign());
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break;
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case TYPE_PERCENT:
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addMatcher(fWarehouse.percent());
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break;
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case TYPE_PERMILLE:
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addMatcher(fWarehouse.permille());
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break;
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case TYPE_CURRENCY_SINGLE:
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case TYPE_CURRENCY_DOUBLE:
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case TYPE_CURRENCY_TRIPLE:
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case TYPE_CURRENCY_QUAD:
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case TYPE_CURRENCY_QUINT:
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// All currency symbols use the same matcher
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addMatcher(fWarehouse.currency(status));
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break;
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default:
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UPRV_UNREACHABLE_EXIT;
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}
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} else if (fIgnorables != nullptr && fIgnorables->getSet()->contains(cp)) {
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// Case 2: the token is an ignorable literal.
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// No action necessary: the ignorables matcher has already been added.
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} else {
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// Case 3: the token is a non-ignorable literal.
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if (auto* ptr = fWarehouse.nextCodePointMatcher(cp, status)) {
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addMatcher(*ptr);
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} else {
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// OOM; unwind the stack
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return;
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}
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}
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fLastTypeOrCp = type != TYPE_CODEPOINT ? type : cp;
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}
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void AffixPatternMatcherBuilder::addMatcher(NumberParseMatcher& matcher) {
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if (fMatchersLen >= fMatchers.getCapacity()) {
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fMatchers.resize(fMatchersLen * 2, fMatchersLen);
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}
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fMatchers[fMatchersLen++] = &matcher;
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}
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AffixPatternMatcher AffixPatternMatcherBuilder::build(UErrorCode& status) {
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return AffixPatternMatcher(fMatchers, fMatchersLen, fPattern, status);
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}
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AffixTokenMatcherWarehouse::AffixTokenMatcherWarehouse(const AffixTokenMatcherSetupData* setupData)
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: fSetupData(setupData) {}
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NumberParseMatcher& AffixTokenMatcherWarehouse::minusSign() {
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return fMinusSign = {fSetupData->dfs, true};
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}
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NumberParseMatcher& AffixTokenMatcherWarehouse::plusSign() {
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return fPlusSign = {fSetupData->dfs, true};
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}
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NumberParseMatcher& AffixTokenMatcherWarehouse::percent() {
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return fPercent = {fSetupData->dfs};
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}
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NumberParseMatcher& AffixTokenMatcherWarehouse::permille() {
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return fPermille = {fSetupData->dfs};
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}
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NumberParseMatcher& AffixTokenMatcherWarehouse::currency(UErrorCode& status) {
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return fCurrency = {fSetupData->currencySymbols, fSetupData->dfs, fSetupData->parseFlags, status};
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}
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IgnorablesMatcher& AffixTokenMatcherWarehouse::ignorables() {
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return fSetupData->ignorables;
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}
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NumberParseMatcher* AffixTokenMatcherWarehouse::nextCodePointMatcher(UChar32 cp, UErrorCode& status) {
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if (U_FAILURE(status)) {
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return nullptr;
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}
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auto* result = fCodePoints.create(cp);
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if (result == nullptr) {
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status = U_MEMORY_ALLOCATION_ERROR;
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}
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return result;
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}
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CodePointMatcher::CodePointMatcher(UChar32 cp)
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: fCp(cp) {}
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bool CodePointMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode&) const {
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if (segment.startsWith(fCp)) {
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segment.adjustOffsetByCodePoint();
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result.setCharsConsumed(segment);
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}
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return false;
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}
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bool CodePointMatcher::smokeTest(const StringSegment& segment) const {
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return segment.startsWith(fCp);
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}
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UnicodeString CodePointMatcher::toString() const {
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return u"<CodePoint>";
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}
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AffixPatternMatcher AffixPatternMatcher::fromAffixPattern(const UnicodeString& affixPattern,
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AffixTokenMatcherWarehouse& tokenWarehouse,
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parse_flags_t parseFlags, bool* success,
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UErrorCode& status) {
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if (affixPattern.isEmpty()) {
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*success = false;
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return {};
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}
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*success = true;
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IgnorablesMatcher* ignorables;
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if (0 != (parseFlags & PARSE_FLAG_EXACT_AFFIX)) {
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ignorables = nullptr;
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} else {
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ignorables = &tokenWarehouse.ignorables();
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}
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AffixPatternMatcherBuilder builder(affixPattern, tokenWarehouse, ignorables);
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AffixUtils::iterateWithConsumer(affixPattern, builder, status);
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return builder.build(status);
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}
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AffixPatternMatcher::AffixPatternMatcher(MatcherArray& matchers, int32_t matchersLen,
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const UnicodeString& pattern, UErrorCode& status)
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: ArraySeriesMatcher(matchers, matchersLen), fPattern(pattern, status) {
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}
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UnicodeString AffixPatternMatcher::getPattern() const {
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return fPattern.toAliasedUnicodeString();
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}
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bool AffixPatternMatcher::operator==(const AffixPatternMatcher& other) const {
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return fPattern == other.fPattern;
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}
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AffixMatcherWarehouse::AffixMatcherWarehouse(AffixTokenMatcherWarehouse* tokenWarehouse)
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: fTokenWarehouse(tokenWarehouse) {
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}
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bool AffixMatcherWarehouse::isInteresting(const AffixPatternProvider& patternInfo,
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const IgnorablesMatcher& ignorables, parse_flags_t parseFlags,
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UErrorCode& status) {
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UnicodeString posPrefixString = patternInfo.getString(AffixPatternProvider::AFFIX_POS_PREFIX);
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UnicodeString posSuffixString = patternInfo.getString(AffixPatternProvider::AFFIX_POS_SUFFIX);
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UnicodeString negPrefixString;
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UnicodeString negSuffixString;
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if (patternInfo.hasNegativeSubpattern()) {
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negPrefixString = patternInfo.getString(AffixPatternProvider::AFFIX_NEG_PREFIX);
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negSuffixString = patternInfo.getString(AffixPatternProvider::AFFIX_NEG_SUFFIX);
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}
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if (0 == (parseFlags & PARSE_FLAG_USE_FULL_AFFIXES) &&
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AffixUtils::containsOnlySymbolsAndIgnorables(posPrefixString, *ignorables.getSet(), status) &&
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AffixUtils::containsOnlySymbolsAndIgnorables(posSuffixString, *ignorables.getSet(), status) &&
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AffixUtils::containsOnlySymbolsAndIgnorables(negPrefixString, *ignorables.getSet(), status) &&
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AffixUtils::containsOnlySymbolsAndIgnorables(negSuffixString, *ignorables.getSet(), status)
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// HACK: Plus and minus sign are a special case: we accept them trailing only if they are
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// trailing in the pattern string.
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&& !AffixUtils::containsType(posSuffixString, TYPE_PLUS_SIGN, status) &&
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!AffixUtils::containsType(posSuffixString, TYPE_MINUS_SIGN, status) &&
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!AffixUtils::containsType(negSuffixString, TYPE_PLUS_SIGN, status) &&
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!AffixUtils::containsType(negSuffixString, TYPE_MINUS_SIGN, status)) {
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// The affixes contain only symbols and ignorables.
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// No need to generate affix matchers.
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return false;
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}
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return true;
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}
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void AffixMatcherWarehouse::createAffixMatchers(const AffixPatternProvider& patternInfo,
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MutableMatcherCollection& output,
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const IgnorablesMatcher& ignorables,
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parse_flags_t parseFlags, UErrorCode& status) {
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if (!isInteresting(patternInfo, ignorables, parseFlags, status)) {
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return;
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}
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// The affixes have interesting characters, or we are in strict mode.
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// Use initial capacity of 6, the highest possible number of AffixMatchers.
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UnicodeString sb;
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bool includeUnpaired = 0 != (parseFlags & PARSE_FLAG_INCLUDE_UNPAIRED_AFFIXES);
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int32_t numAffixMatchers = 0;
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int32_t numAffixPatternMatchers = 0;
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AffixPatternMatcher* posPrefix = nullptr;
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AffixPatternMatcher* posSuffix = nullptr;
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// Pre-process the affix strings to resolve LDML rules like sign display.
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for (int8_t typeInt = 0; typeInt < PATTERN_SIGN_TYPE_COUNT; typeInt++) {
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auto type = static_cast<PatternSignType>(typeInt);
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// Skip affixes in some cases
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if (type == PATTERN_SIGN_TYPE_POS
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&& 0 != (parseFlags & PARSE_FLAG_PLUS_SIGN_ALLOWED)) {
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continue;
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}
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if (type == PATTERN_SIGN_TYPE_POS_SIGN
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&& 0 == (parseFlags & PARSE_FLAG_PLUS_SIGN_ALLOWED)) {
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continue;
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}
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// Generate Prefix
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// TODO: Handle approximately sign?
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bool hasPrefix = false;
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PatternStringUtils::patternInfoToStringBuilder(
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patternInfo, true, type, false, StandardPlural::OTHER, false, sb);
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fAffixPatternMatchers[numAffixPatternMatchers] = AffixPatternMatcher::fromAffixPattern(
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sb, *fTokenWarehouse, parseFlags, &hasPrefix, status);
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AffixPatternMatcher* prefix = hasPrefix ? &fAffixPatternMatchers[numAffixPatternMatchers++]
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: nullptr;
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// Generate Suffix
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// TODO: Handle approximately sign?
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bool hasSuffix = false;
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PatternStringUtils::patternInfoToStringBuilder(
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patternInfo, false, type, false, StandardPlural::OTHER, false, sb);
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fAffixPatternMatchers[numAffixPatternMatchers] = AffixPatternMatcher::fromAffixPattern(
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sb, *fTokenWarehouse, parseFlags, &hasSuffix, status);
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AffixPatternMatcher* suffix = hasSuffix ? &fAffixPatternMatchers[numAffixPatternMatchers++]
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: nullptr;
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if (type == PATTERN_SIGN_TYPE_POS) {
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posPrefix = prefix;
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posSuffix = suffix;
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} else if (equals(prefix, posPrefix) && equals(suffix, posSuffix)) {
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// Skip adding these matchers (we already have equivalents)
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continue;
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}
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// Flags for setting in the ParsedNumber; the token matchers may add more.
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int flags = (type == PATTERN_SIGN_TYPE_NEG) ? FLAG_NEGATIVE : 0;
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// Note: it is indeed possible for posPrefix and posSuffix to both be null.
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// We still need to add that matcher for strict mode to work.
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fAffixMatchers[numAffixMatchers++] = {prefix, suffix, flags};
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if (includeUnpaired && prefix != nullptr && suffix != nullptr) {
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// The following if statements are designed to prevent adding two identical matchers.
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if (type == PATTERN_SIGN_TYPE_POS || !equals(prefix, posPrefix)) {
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fAffixMatchers[numAffixMatchers++] = {prefix, nullptr, flags};
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}
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if (type == PATTERN_SIGN_TYPE_POS || !equals(suffix, posSuffix)) {
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fAffixMatchers[numAffixMatchers++] = {nullptr, suffix, flags};
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}
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}
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}
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// Put the AffixMatchers in order, and then add them to the output.
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// Since there are at most 9 elements, do a simple-to-implement bubble sort.
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bool madeChanges;
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do {
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madeChanges = false;
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for (int32_t i = 1; i < numAffixMatchers; i++) {
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if (fAffixMatchers[i - 1].compareTo(fAffixMatchers[i]) > 0) {
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madeChanges = true;
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AffixMatcher temp = std::move(fAffixMatchers[i - 1]);
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fAffixMatchers[i - 1] = std::move(fAffixMatchers[i]);
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fAffixMatchers[i] = std::move(temp);
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}
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}
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} while (madeChanges);
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for (int32_t i = 0; i < numAffixMatchers; i++) {
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// Enable the following line to debug affixes
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//std::cout << "Adding affix matcher: " << CStr(fAffixMatchers[i].toString())() << std::endl;
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output.addMatcher(fAffixMatchers[i]);
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}
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}
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AffixMatcher::AffixMatcher(AffixPatternMatcher* prefix, AffixPatternMatcher* suffix, result_flags_t flags)
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: fPrefix(prefix), fSuffix(suffix), fFlags(flags) {}
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bool AffixMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const {
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if (!result.seenNumber()) {
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// Prefix
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// Do not match if:
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// 1. We have already seen a prefix (result.prefix != null)
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// 2. The prefix in this AffixMatcher is empty (prefix == null)
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if (!result.prefix.isBogus() || fPrefix == nullptr) {
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return false;
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}
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// Attempt to match the prefix.
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int initialOffset = segment.getOffset();
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bool maybeMore = fPrefix->match(segment, result, status);
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if (initialOffset != segment.getOffset()) {
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result.prefix = fPrefix->getPattern();
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}
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return maybeMore;
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} else {
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// Suffix
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// Do not match if:
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// 1. We have already seen a suffix (result.suffix != null)
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// 2. The suffix in this AffixMatcher is empty (suffix == null)
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// 3. The matched prefix does not equal this AffixMatcher's prefix
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if (!result.suffix.isBogus() || fSuffix == nullptr || !matched(fPrefix, result.prefix)) {
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return false;
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}
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// Attempt to match the suffix.
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int initialOffset = segment.getOffset();
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bool maybeMore = fSuffix->match(segment, result, status);
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if (initialOffset != segment.getOffset()) {
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result.suffix = fSuffix->getPattern();
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}
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return maybeMore;
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}
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}
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bool AffixMatcher::smokeTest(const StringSegment& segment) const {
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return (fPrefix != nullptr && fPrefix->smokeTest(segment)) ||
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(fSuffix != nullptr && fSuffix->smokeTest(segment));
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}
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void AffixMatcher::postProcess(ParsedNumber& result) const {
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// Check to see if our affix is the one that was matched. If so, set the flags in the result.
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if (matched(fPrefix, result.prefix) && matched(fSuffix, result.suffix)) {
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// Fill in the result prefix and suffix with non-null values (empty string).
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// Used by strict mode to determine whether an entire affix pair was matched.
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if (result.prefix.isBogus()) {
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result.prefix = UnicodeString();
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}
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if (result.suffix.isBogus()) {
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result.suffix = UnicodeString();
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}
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result.flags |= fFlags;
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if (fPrefix != nullptr) {
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fPrefix->postProcess(result);
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}
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if (fSuffix != nullptr) {
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fSuffix->postProcess(result);
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}
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}
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}
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int8_t AffixMatcher::compareTo(const AffixMatcher& rhs) const {
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const AffixMatcher& lhs = *this;
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if (length(lhs.fPrefix) != length(rhs.fPrefix)) {
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return length(lhs.fPrefix) > length(rhs.fPrefix) ? -1 : 1;
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} else if (length(lhs.fSuffix) != length(rhs.fSuffix)) {
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return length(lhs.fSuffix) > length(rhs.fSuffix) ? -1 : 1;
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} else {
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return 0;
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}
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}
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UnicodeString AffixMatcher::toString() const {
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bool isNegative = 0 != (fFlags & FLAG_NEGATIVE);
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return UnicodeString(u"<Affix") + (isNegative ? u":negative " : u" ") +
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(fPrefix ? fPrefix->getPattern() : u"null") + u"#" +
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(fSuffix ? fSuffix->getPattern() : u"null") + u">";
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}
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#endif /* #if !UCONFIG_NO_FORMATTING */
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