Annotation of embedaddon/pcre/pcre_xclass.c, revision 1.1.1.2
1.1 misho 1: /*************************************************
2: * Perl-Compatible Regular Expressions *
3: *************************************************/
4:
5: /* PCRE is a library of functions to support regular expressions whose syntax
6: and semantics are as close as possible to those of the Perl 5 language.
7:
8: Written by Philip Hazel
1.1.1.2 ! misho 9: Copyright (c) 1997-2012 University of Cambridge
1.1 misho 10:
11: -----------------------------------------------------------------------------
12: Redistribution and use in source and binary forms, with or without
13: modification, 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:
26: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: POSSIBILITY OF SUCH DAMAGE.
37: -----------------------------------------------------------------------------
38: */
39:
40:
41: /* This module contains an internal function that is used to match an extended
42: class. 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
57: might contain values > 255 and/or Unicode properties.
58:
59: Arguments:
60: c the character
61: data points to the flag byte of the XCLASS data
62:
63: Returns: TRUE if character matches, else FALSE
64: */
65:
66: BOOL
1.1.1.2 ! misho 67: PRIV(xclass)(int c, const pcre_uchar *data, BOOL utf)
1.1 misho 68: {
69: int t;
70: BOOL negated = (*data & XCL_NOT) != 0;
71:
1.1.1.2 ! misho 72: (void)utf;
! 73: #ifdef COMPILE_PCRE8
! 74: /* In 8 bit mode, this must always be TRUE. Help the compiler to know that. */
! 75: utf = TRUE;
! 76: #endif
! 77:
1.1 misho 78: /* Character values < 256 are matched against a bitmap, if one is present. If
79: not, we still carry on, because there may be ranges that start below 256 in the
80: additional data. */
81:
82: if (c < 256)
83: {
1.1.1.2 ! misho 84: if ((*data & XCL_MAP) != 0 &&
! 85: (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
! 86: return !negated; /* char found */
1.1 misho 87: }
88:
89: /* First skip the bit map if present. Then match against the list of Unicode
90: properties or large chars or ranges that end with a large char. We won't ever
91: encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
92:
1.1.1.2 ! misho 93: if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
1.1 misho 94:
95: while ((t = *data++) != XCL_END)
96: {
97: int x, y;
98: if (t == XCL_SINGLE)
99: {
1.1.1.2 ! misho 100: #ifdef SUPPORT_UTF
! 101: if (utf)
! 102: {
! 103: GETCHARINC(x, data); /* macro generates multiple statements */
! 104: }
! 105: else
! 106: #endif
! 107: x = *data++;
1.1 misho 108: if (c == x) return !negated;
109: }
110: else if (t == XCL_RANGE)
111: {
1.1.1.2 ! misho 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: }
1.1 misho 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:
1.1.1.2 ! misho 144: if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == (t == XCL_PROP))
1.1 misho 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:
1.1.1.2 ! misho 157: if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
! 158: PRIV(ucp_gentype)[prop->chartype] == ucp_N) == (t == XCL_PROP))
1.1 misho 159: return !negated;
160: break;
161:
162: case PT_SPACE: /* Perl space */
1.1.1.2 ! misho 163: if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
1.1 misho 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 */
1.1.1.2 ! misho 170: if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
1.1 misho 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:
1.1.1.2 ! misho 177: if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
! 178: PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
1.1 misho 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:
195: return negated; /* char did not match */
196: }
197:
198: /* End of pcre_xclass.c */
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