126 lines
4.0 KiB
C++
126 lines
4.0 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 && !UPRV_INCOMPLETE_CPP11_SUPPORT
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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_compositions.h"
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#include "unicode/uniset.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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bool AnyMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const {
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int32_t initialOffset = segment.getOffset();
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bool maybeMore = false;
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// NOTE: The range-based for loop calls the virtual begin() and end() methods.
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for (auto& matcher : *this) {
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maybeMore = maybeMore || matcher->match(segment, result, status);
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if (segment.getOffset() != initialOffset) {
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// Match succeeded.
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// NOTE: Except for a couple edge cases, if a matcher accepted string A, then it will
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// accept any string starting with A. Therefore, there is no possibility that matchers
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// later in the list may be evaluated on longer strings, and we can exit the loop here.
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break;
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}
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}
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// None of the matchers succeeded.
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return maybeMore;
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}
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void AnyMatcher::postProcess(ParsedNumber& result) const {
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// NOTE: The range-based for loop calls the virtual begin() and end() methods.
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for (auto* matcher : *this) {
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matcher->postProcess(result);
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}
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}
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bool SeriesMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const {
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ParsedNumber backup(result);
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int32_t initialOffset = segment.getOffset();
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bool maybeMore = true;
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for (auto* it = begin(); it < end();) {
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const NumberParseMatcher* matcher = *it;
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int matcherOffset = segment.getOffset();
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if (segment.length() != 0) {
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maybeMore = matcher->match(segment, result, status);
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} else {
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// Nothing for this matcher to match; ask for more.
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maybeMore = true;
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}
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bool success = (segment.getOffset() != matcherOffset);
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bool isFlexible = matcher->isFlexible();
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if (success && isFlexible) {
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// Match succeeded, and this is a flexible matcher. Re-run it.
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} else if (success) {
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// Match succeeded, and this is NOT a flexible matcher. Proceed to the next matcher.
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it++;
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} else if (isFlexible) {
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// Match failed, and this is a flexible matcher. Try again with the next matcher.
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it++;
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} else {
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// Match failed, and this is NOT a flexible matcher. Exit.
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segment.setOffset(initialOffset);
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result = backup;
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return maybeMore;
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}
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}
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// All matchers in the series succeeded.
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return maybeMore;
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}
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void SeriesMatcher::postProcess(ParsedNumber& result) const {
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// NOTE: The range-based for loop calls the virtual begin() and end() methods.
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for (auto* matcher : *this) {
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matcher->postProcess(result);
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}
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}
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ArraySeriesMatcher::ArraySeriesMatcher()
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: fMatchersLen(0) {
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}
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ArraySeriesMatcher::ArraySeriesMatcher(MatcherArray& matchers, int32_t matchersLen)
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: fMatchers(std::move(matchers)), fMatchersLen(matchersLen) {
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}
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const UnicodeSet& ArraySeriesMatcher::getLeadCodePoints() {
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// SeriesMatchers are never allowed to start with a Flexible matcher.
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U_ASSERT(!fMatchers[0]->isFlexible());
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return fMatchers[0]->getLeadCodePoints();
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}
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int32_t ArraySeriesMatcher::length() const {
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return fMatchersLen;
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}
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const NumberParseMatcher* const* ArraySeriesMatcher::begin() const {
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return fMatchers.getAlias();
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}
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const NumberParseMatcher* const* ArraySeriesMatcher::end() const {
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return fMatchers.getAlias() + fMatchersLen;
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}
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UnicodeString ArraySeriesMatcher::toString() const {
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return u"<ArraySeries>";
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}
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#endif /* #if !UCONFIG_NO_FORMATTING */
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