1/* This is JavaScriptCore's variant of the PCRE library. While this library
2started out as a copy of PCRE, many of the features of PCRE have been
3removed. This library now supports only the regular expression features
4required by the JavaScript language specification, and has only the functions
5needed by JavaScriptCore and the rest of WebKit.
6
7 Originally written by Philip Hazel
8 Copyright (c) 1997-2006 University of Cambridge
9 Copyright (C) 2002, 2004, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
10
11-----------------------------------------------------------------------------
12Redistribution and use in source and binary forms, with or without
13modification, are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright
19 notice, this list of conditions and the following disclaimer in the
20 documentation and/or other materials provided with the distribution.
21
22 * Neither the name of the University of Cambridge nor the names of its
23 contributors may be used to endorse or promote products derived from
24 this software without specific prior written permission.
25
26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36POSSIBILITY OF SUCH DAMAGE.
37-----------------------------------------------------------------------------
38*/
39
40/* This module contains an internal function that is used to match an extended
41class (one that contains characters whose values are > 255). */
42
43#include "config.h"
44#include "pcre_internal.h"
45
46/*************************************************
47* Match character against an XCLASS *
48*************************************************/
49
50/* This function is called to match a character against an extended class that
51might contain values > 255.
52
53Arguments:
54 c the character
55 data points to the flag byte of the XCLASS data
56
57Returns: true if character matches, else false
58*/
59
60/* Get the next UTF-8 character, advancing the pointer. This is called when we
61 know we are in UTF-8 mode. */
62
63static inline void getUTF8CharAndAdvancePointer(int& c, const unsigned char*& subjectPtr)
64{
65 c = *subjectPtr++;
66 if ((c & 0xc0) == 0xc0) {
67 int gcaa = jsc_pcre_utf8_table4[c & 0x3f]; /* Number of additional bytes */
68 int gcss = 6 * gcaa;
69 c = (c & jsc_pcre_utf8_table3[gcaa]) << gcss;
70 while (gcaa-- > 0) {
71 gcss -= 6;
72 c |= (*subjectPtr++ & 0x3f) << gcss;
73 }
74 }
75}
76
77bool jsc_pcre_xclass(int c, const unsigned char* data)
78{
79 bool negated = (*data & XCL_NOT);
80
81 /* Character values < 256 are matched against a bitmap, if one is present. If
82 not, we still carry on, because there may be ranges that start below 256 in the
83 additional data. */
84
85 if (c < 256) {
86 if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
87 return !negated; /* char found */
88 }
89
90 /* First skip the bit map if present. Then match against the list of Unicode
91 properties or large chars or ranges that end with a large char. We won't ever
92 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
93
94 if ((*data++ & XCL_MAP) != 0)
95 data += 32;
96
97 int t;
98 while ((t = *data++) != XCL_END) {
99 if (t == XCL_SINGLE) {
100 int x;
101 getUTF8CharAndAdvancePointer(c&: x, subjectPtr&: data);
102 if (c == x)
103 return !negated;
104 }
105 else if (t == XCL_RANGE) {
106 int x, y;
107 getUTF8CharAndAdvancePointer(c&: x, subjectPtr&: data);
108 getUTF8CharAndAdvancePointer(c&: y, subjectPtr&: data);
109 if (c >= x && c <= y)
110 return !negated;
111 }
112 }
113
114 return negated; /* char did not match */
115}
116

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/pcre/pcre_xclass.cpp