regextxt.cpp (1480B)
1 // © 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 /******************************************************************** 4 * COPYRIGHT: 5 * Copyright (c) 2008-2011, International Business Machines Corporation and 6 * others. All Rights Reserved. 7 ********************************************************************/ 8 // 9 // file: regextxt.cpp 10 // 11 // This file contains utility code for supporting UText in the regular expression engine. 12 // 13 14 #include "unicode/utf.h" 15 #include "regextxt.h" 16 17 U_NAMESPACE_BEGIN 18 19 U_CFUNC char16_t U_CALLCONV 20 uregex_utext_unescape_charAt(int32_t offset, void *ct) { 21 struct URegexUTextUnescapeCharContext *context = (struct URegexUTextUnescapeCharContext *)ct; 22 UChar32 c; 23 if (offset == context->lastOffset + 1) { 24 c = UTEXT_NEXT32(context->text); 25 context->lastOffset++; 26 } else if (offset == context->lastOffset) { 27 c = UTEXT_PREVIOUS32(context->text); 28 UTEXT_NEXT32(context->text); 29 } else { 30 utext_moveIndex32(context->text, offset - context->lastOffset - 1); 31 c = UTEXT_NEXT32(context->text); 32 context->lastOffset = offset; 33 } 34 35 // !!!: Doesn't handle characters outside BMP 36 if (U_IS_BMP(c)) { 37 return (char16_t)c; 38 } else { 39 return 0; 40 } 41 } 42 43 U_CFUNC char16_t U_CALLCONV 44 uregex_ucstr_unescape_charAt(int32_t offset, void *context) { 45 return ((char16_t *)context)[offset]; 46 } 47 48 U_NAMESPACE_END