icuSources/i18n/regextxt.cpp

   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 UChar 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 (UChar)c;
  38     } else {
  39         return 0;
  40     }
  41 }
  42
  43 U_CFUNC UChar U_CALLCONV
  44 uregex_ucstr_unescape_charAt(int32_t offset, void *context) {
  45     return ((UChar *)context)[offset];
  46 }
  47
  48 U_NAMESPACE_END