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