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