dgrove@google.com
4c0f559d23
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@15 260f80e4-7a28-3924-810f-c04153c831b5
119 lines
4.5 KiB
C++
119 lines
4.5 KiB
C++
/* This is JavaScriptCore's variant of the PCRE library. While this library
|
|
started out as a copy of PCRE, many of the features of PCRE have been
|
|
removed. This library now supports only the regular expression features
|
|
required by the JavaScript language specification, and has only the functions
|
|
needed by JavaScriptCore and the rest of WebKit.
|
|
|
|
Originally written by Philip Hazel
|
|
Copyright (c) 1997-2006 University of Cambridge
|
|
Copyright (C) 2002, 2004, 2006, 2007 Apple Inc. All rights reserved.
|
|
|
|
-----------------------------------------------------------------------------
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of the University of Cambridge nor the names of its
|
|
contributors may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
-----------------------------------------------------------------------------
|
|
*/
|
|
|
|
/* This module contains an internal function that is used to match an extended
|
|
class (one that contains characters whose values are > 255). */
|
|
|
|
#include "pcre_internal.h"
|
|
|
|
namespace dart { namespace jscre {
|
|
|
|
/*************************************************
|
|
* Match character against an XCLASS *
|
|
*************************************************/
|
|
|
|
/* This function is called to match a character against an extended class that
|
|
might contain values > 255.
|
|
|
|
Arguments:
|
|
c the character
|
|
data points to the flag byte of the XCLASS data
|
|
|
|
Returns: true if character matches, else false
|
|
*/
|
|
|
|
/* Get the next UTF-8 character, advancing the pointer. This is called when we
|
|
know we are in UTF-8 mode. */
|
|
|
|
static inline void getUTF8CharAndAdvancePointer(int& c, const unsigned char*& subjectPtr)
|
|
{
|
|
c = *subjectPtr++;
|
|
if ((c & 0xc0) == 0xc0) {
|
|
int gcaa = kjs_pcre_utf8_table4[c & 0x3f]; /* Number of additional bytes */
|
|
int gcss = 6 * gcaa;
|
|
c = (c & kjs_pcre_utf8_table3[gcaa]) << gcss;
|
|
while (gcaa-- > 0) {
|
|
gcss -= 6;
|
|
c |= (*subjectPtr++ & 0x3f) << gcss;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool kjs_pcre_xclass(int c, const unsigned char* data)
|
|
{
|
|
bool negated = (*data & XCL_NOT);
|
|
|
|
/* Character values < 256 are matched against a bitmap, if one is present. If
|
|
not, we still carry on, because there may be ranges that start below 256 in the
|
|
additional data. */
|
|
|
|
if (c < 256) {
|
|
if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
|
|
return !negated; /* char found */
|
|
}
|
|
|
|
/* First skip the bit map if present. Then match against the list of Unicode
|
|
properties or large chars or ranges that end with a large char. We won't ever
|
|
encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
|
|
|
|
if ((*data++ & XCL_MAP) != 0)
|
|
data += 32;
|
|
|
|
int t;
|
|
while ((t = *data++) != XCL_END) {
|
|
if (t == XCL_SINGLE) {
|
|
int x;
|
|
getUTF8CharAndAdvancePointer(x, data);
|
|
if (c == x)
|
|
return !negated;
|
|
}
|
|
else if (t == XCL_RANGE) {
|
|
int x, y;
|
|
getUTF8CharAndAdvancePointer(x, data);
|
|
getUTF8CharAndAdvancePointer(y, data);
|
|
if (c >= x && c <= y)
|
|
return !negated;
|
|
}
|
|
}
|
|
|
|
return negated; /* char did not match */
|
|
}
|
|
|
|
} } // namespace dart::jscre
|