121 lines
3.4 KiB
C++
121 lines
3.4 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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//
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// Copyright (C) 2012 International Business Machines Corporation
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// and others. All rights reserved.
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//
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// file: regeximp.cpp
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//
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// ICU Regular Expressions,
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// miscellaneous implementation functions.
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//
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_REGULAR_EXPRESSIONS
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#include "regeximp.h"
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#include "unicode/utf16.h"
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U_NAMESPACE_BEGIN
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CaseFoldingUTextIterator::CaseFoldingUTextIterator(UText &text) :
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fUText(text), fFoldChars(NULL), fFoldLength(0) {
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}
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CaseFoldingUTextIterator::~CaseFoldingUTextIterator() {}
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UChar32 CaseFoldingUTextIterator::next() {
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UChar32 foldedC;
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UChar32 originalC;
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if (fFoldChars == NULL) {
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// We are not in a string folding of an earlier character.
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// Start handling the next char from the input UText.
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originalC = UTEXT_NEXT32(&fUText);
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if (originalC == U_SENTINEL) {
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return originalC;
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}
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fFoldLength = ucase_toFullFolding(originalC, &fFoldChars, U_FOLD_CASE_DEFAULT);
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if (fFoldLength >= UCASE_MAX_STRING_LENGTH || fFoldLength < 0) {
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// input code point folds to a single code point, possibly itself.
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// See comment in ucase.h for explanation of return values from ucase_toFullFoldings.
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if (fFoldLength < 0) {
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fFoldLength = ~fFoldLength;
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}
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foldedC = (UChar32)fFoldLength;
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fFoldChars = NULL;
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return foldedC;
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}
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// String foldings fall through here.
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fFoldIndex = 0;
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}
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U16_NEXT(fFoldChars, fFoldIndex, fFoldLength, foldedC);
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if (fFoldIndex >= fFoldLength) {
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fFoldChars = NULL;
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}
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return foldedC;
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}
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UBool CaseFoldingUTextIterator::inExpansion() {
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return fFoldChars != NULL;
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}
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CaseFoldingUCharIterator::CaseFoldingUCharIterator(const UChar *chars, int64_t start, int64_t limit) :
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fChars(chars), fIndex(start), fLimit(limit), fFoldChars(NULL), fFoldLength(0) {
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}
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CaseFoldingUCharIterator::~CaseFoldingUCharIterator() {}
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UChar32 CaseFoldingUCharIterator::next() {
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UChar32 foldedC;
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UChar32 originalC;
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if (fFoldChars == NULL) {
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// We are not in a string folding of an earlier character.
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// Start handling the next char from the input UText.
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if (fIndex >= fLimit) {
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return U_SENTINEL;
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}
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U16_NEXT(fChars, fIndex, fLimit, originalC);
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fFoldLength = ucase_toFullFolding(originalC, &fFoldChars, U_FOLD_CASE_DEFAULT);
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if (fFoldLength >= UCASE_MAX_STRING_LENGTH || fFoldLength < 0) {
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// input code point folds to a single code point, possibly itself.
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// See comment in ucase.h for explanation of return values from ucase_toFullFoldings.
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if (fFoldLength < 0) {
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fFoldLength = ~fFoldLength;
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}
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foldedC = (UChar32)fFoldLength;
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fFoldChars = NULL;
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return foldedC;
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}
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// String foldings fall through here.
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fFoldIndex = 0;
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}
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U16_NEXT(fFoldChars, fFoldIndex, fFoldLength, foldedC);
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if (fFoldIndex >= fFoldLength) {
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fFoldChars = NULL;
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}
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return foldedC;
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}
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UBool CaseFoldingUCharIterator::inExpansion() {
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return fFoldChars != NULL;
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}
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int64_t CaseFoldingUCharIterator::getIndex() {
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return fIndex;
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}
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U_NAMESPACE_END
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#endif
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