icuSources/i18n/regextxt.cpp

   1 /********************************************************************
   2  * COPYRIGHT:
   3  * Copyright (c) 2008-2010, 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 "regextxt.h"
  13
  14 U_NAMESPACE_BEGIN
  15
  16 U_CFUNC UChar U_CALLCONV
  17 uregex_utext_unescape_charAt(int32_t offset, void *ct) {
  18     struct URegexUTextUnescapeCharContext *context = (struct URegexUTextUnescapeCharContext *)ct;
  19     UChar32 c;
  20     if (offset == context->lastOffset + 1) {
  21         c = UTEXT_NEXT32(context->text);
  22         context->lastOffset++;
  23     } else if (offset == context->lastOffset) {
  24         c = UTEXT_PREVIOUS32(context->text);
  25         UTEXT_NEXT32(context->text);
  26     } else {
  27         utext_moveIndex32(context->text, offset - context->lastOffset - 1);
  28         c = UTEXT_NEXT32(context->text);
  29         context->lastOffset = offset;
  30     }
  31
  32     // !!!: Doesn't handle characters outside BMP
  33     if (U_IS_BMP(c)) {
  34         return (UChar)c;
  35     } else {
  36         return 0;
  37     }
  38 }
  39
  40 U_CFUNC UChar U_CALLCONV
  41 uregex_ucstr_unescape_charAt(int32_t offset, void *context) {
  42     return ((UChar *)context)[offset];
  43 }
  44
  45 U_NAMESPACE_END