1/*************************************************
2*      Perl-Compatible Regular Expressions       *
3*************************************************/
4
5/* PCRE is a library of functions to support regular expressions whose syntax
6and semantics are as close as possible to those of the Perl 5 language.
7
8                       Written by Philip Hazel
9           Copyright (c) 1997-2012 University of Cambridge
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
41/* This module contains an internal function that is used to match an extended
42class. It is used by both pcre_exec() and pcre_def_exec(). */
43
44
45#ifdef HAVE_CONFIG_H
46#include "config.h"
47#endif
48
49#include "pcre_internal.h"
50
51
52/*************************************************
53*       Match character against an XCLASS        *
54*************************************************/
55
56/* This function is called to match a character against an extended class that
57might contain values > 255 and/or Unicode properties.
58
59Arguments:
60  c           the character
61  data        points to the flag byte of the XCLASS data
62
63Returns:      TRUE if character matches, else FALSE
64*/
65
66BOOL
67PRIV(xclass)(int c, const pcre_uchar *data, BOOL utf)
68{
69int t;
70BOOL negated = (*data & XCL_NOT) != 0;
71
72(void)utf;
73#ifdef COMPILE_PCRE8
74/* In 8 bit mode, this must always be TRUE. Help the compiler to know that. */
75utf = TRUE;
76#endif
77
78/* Character values < 256 are matched against a bitmap, if one is present. If
79not, we still carry on, because there may be ranges that start below 256 in the
80additional data. */
81
82if (c < 256)
83  {
84  if ((*data & XCL_MAP) != 0 &&
85    (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
86    return !negated; /* char found */
87  }
88
89/* First skip the bit map if present. Then match against the list of Unicode
90properties or large chars or ranges that end with a large char. We won't ever
91encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
92
93if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
94
95while ((t = *data++) != XCL_END)
96  {
97  int x, y;
98  if (t == XCL_SINGLE)
99    {
100#ifdef SUPPORT_UTF
101    if (utf)
102      {
103      GETCHARINC(x, data); /* macro generates multiple statements */
104      }
105    else
106#endif
107      x = *data++;
108    if (c == x) return !negated;
109    }
110  else if (t == XCL_RANGE)
111    {
112#ifdef SUPPORT_UTF
113    if (utf)
114      {
115      GETCHARINC(x, data); /* macro generates multiple statements */
116      GETCHARINC(y, data); /* macro generates multiple statements */
117      }
118    else
119#endif
120      {
121      x = *data++;
122      y = *data++;
123      }
124    if (c >= x && c <= y) return !negated;
125    }
126
127#ifdef SUPPORT_UCP
128  else  /* XCL_PROP & XCL_NOTPROP */
129    {
130    const ucd_record *prop = GET_UCD(c);
131
132    switch(*data)
133      {
134      case PT_ANY:
135      if (t == XCL_PROP) return !negated;
136      break;
137
138      case PT_LAMP:
139      if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
140           prop->chartype == ucp_Lt) == (t == XCL_PROP)) return !negated;
141      break;
142
143      case PT_GC:
144      if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == (t == XCL_PROP))
145        return !negated;
146      break;
147
148      case PT_PC:
149      if ((data[1] == prop->chartype) == (t == XCL_PROP)) return !negated;
150      break;
151
152      case PT_SC:
153      if ((data[1] == prop->script) == (t == XCL_PROP)) return !negated;
154      break;
155
156      case PT_ALNUM:
157      if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
158           PRIV(ucp_gentype)[prop->chartype] == ucp_N) == (t == XCL_PROP))
159        return !negated;
160      break;
161
162      case PT_SPACE:    /* Perl space */
163      if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
164           c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
165             == (t == XCL_PROP))
166        return !negated;
167      break;
168
169      case PT_PXSPACE:  /* POSIX space */
170      if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
171           c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
172           c == CHAR_FF || c == CHAR_CR) == (t == XCL_PROP))
173        return !negated;
174      break;
175
176      case PT_WORD:
177      if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
178           PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
179             == (t == XCL_PROP))
180        return !negated;
181      break;
182
183      /* This should never occur, but compilers may mutter if there is no
184      default. */
185
186      default:
187      return FALSE;
188      }
189
190    data += 2;
191    }
192#endif  /* SUPPORT_UCP */
193  }
194
195return negated;   /* char did not match */
196}
197
198/* End of pcre_xclass.c */
199