michael@0: /********************************************************************
michael@0:  * COPYRIGHT:
michael@0:  * Copyright (c) 2008-2011, International Business Machines Corporation and
michael@0:  * others. All Rights Reserved.
michael@0:  ********************************************************************/
michael@0: //
michael@0: //  file:  regextxt.cpp
michael@0: //
michael@0: //  This file contains utility code for supporting UText in the regular expression engine.
michael@0: //
michael@0: 
michael@0: #include "unicode/utf.h"
michael@0: #include "regextxt.h"
michael@0: 
michael@0: U_NAMESPACE_BEGIN
michael@0: 
michael@0: U_CFUNC UChar U_CALLCONV
michael@0: uregex_utext_unescape_charAt(int32_t offset, void *ct) {
michael@0:     struct URegexUTextUnescapeCharContext *context = (struct URegexUTextUnescapeCharContext *)ct;
michael@0:     UChar32 c;
michael@0:     if (offset == context->lastOffset + 1) {
michael@0:         c = UTEXT_NEXT32(context->text);
michael@0:         context->lastOffset++;
michael@0:     } else if (offset == context->lastOffset) {
michael@0:         c = UTEXT_PREVIOUS32(context->text);
michael@0:         UTEXT_NEXT32(context->text);
michael@0:     } else {
michael@0:         utext_moveIndex32(context->text, offset - context->lastOffset - 1);
michael@0:         c = UTEXT_NEXT32(context->text);
michael@0:         context->lastOffset = offset;
michael@0:     }
michael@0: 
michael@0:     // !!!: Doesn't handle characters outside BMP
michael@0:     if (U_IS_BMP(c)) {
michael@0:         return (UChar)c;
michael@0:     } else {
michael@0:         return 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: U_CFUNC UChar U_CALLCONV
michael@0: uregex_ucstr_unescape_charAt(int32_t offset, void *context) {
michael@0:     return ((UChar *)context)[offset];
michael@0: }
michael@0: 
michael@0: U_NAMESPACE_END