icuSources/i18n/regextxt.cpp

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