Tristan Matthews | 0461646 | 2013-11-14 16:09:34 -0500 | [diff] [blame] | 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 |
| 9 | Copyright (c) 1997-2010 University of Cambridge |
| 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 |
| 67 | _pcre_xclass(int c, const uschar *data) |
| 68 | { |
| 69 | int t; |
| 70 | BOOL negated = (*data & XCL_NOT) != 0; |
| 71 | |
| 72 | /* Character values < 256 are matched against a bitmap, if one is present. If |
| 73 | not, we still carry on, because there may be ranges that start below 256 in the |
| 74 | additional data. */ |
| 75 | |
| 76 | if (c < 256) |
| 77 | { |
| 78 | if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0) |
| 79 | return !negated; /* char found */ |
| 80 | } |
| 81 | |
| 82 | /* First skip the bit map if present. Then match against the list of Unicode |
| 83 | properties or large chars or ranges that end with a large char. We won't ever |
| 84 | encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */ |
| 85 | |
| 86 | if ((*data++ & XCL_MAP) != 0) data += 32; |
| 87 | |
| 88 | while ((t = *data++) != XCL_END) |
| 89 | { |
| 90 | int x, y; |
| 91 | if (t == XCL_SINGLE) |
| 92 | { |
| 93 | GETCHARINC(x, data); |
| 94 | if (c == x) return !negated; |
| 95 | } |
| 96 | else if (t == XCL_RANGE) |
| 97 | { |
| 98 | GETCHARINC(x, data); |
| 99 | GETCHARINC(y, data); |
| 100 | if (c >= x && c <= y) return !negated; |
| 101 | } |
| 102 | |
| 103 | #ifdef SUPPORT_UCP |
| 104 | else /* XCL_PROP & XCL_NOTPROP */ |
| 105 | { |
| 106 | const ucd_record *prop = GET_UCD(c); |
| 107 | |
| 108 | switch(*data) |
| 109 | { |
| 110 | case PT_ANY: |
| 111 | if (t == XCL_PROP) return !negated; |
| 112 | break; |
| 113 | |
| 114 | case PT_LAMP: |
| 115 | if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll || |
| 116 | prop->chartype == ucp_Lt) == (t == XCL_PROP)) return !negated; |
| 117 | break; |
| 118 | |
| 119 | case PT_GC: |
| 120 | if ((data[1] == _pcre_ucp_gentype[prop->chartype]) == (t == XCL_PROP)) |
| 121 | return !negated; |
| 122 | break; |
| 123 | |
| 124 | case PT_PC: |
| 125 | if ((data[1] == prop->chartype) == (t == XCL_PROP)) return !negated; |
| 126 | break; |
| 127 | |
| 128 | case PT_SC: |
| 129 | if ((data[1] == prop->script) == (t == XCL_PROP)) return !negated; |
| 130 | break; |
| 131 | |
| 132 | case PT_ALNUM: |
| 133 | if ((_pcre_ucp_gentype[prop->chartype] == ucp_L || |
| 134 | _pcre_ucp_gentype[prop->chartype] == ucp_N) == (t == XCL_PROP)) |
| 135 | return !negated; |
| 136 | break; |
| 137 | |
| 138 | case PT_SPACE: /* Perl space */ |
| 139 | if ((_pcre_ucp_gentype[prop->chartype] == ucp_Z || |
| 140 | c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR) |
| 141 | == (t == XCL_PROP)) |
| 142 | return !negated; |
| 143 | break; |
| 144 | |
| 145 | case PT_PXSPACE: /* POSIX space */ |
| 146 | if ((_pcre_ucp_gentype[prop->chartype] == ucp_Z || |
| 147 | c == CHAR_HT || c == CHAR_NL || c == CHAR_VT || |
| 148 | c == CHAR_FF || c == CHAR_CR) == (t == XCL_PROP)) |
| 149 | return !negated; |
| 150 | break; |
| 151 | |
| 152 | case PT_WORD: |
| 153 | if ((_pcre_ucp_gentype[prop->chartype] == ucp_L || |
| 154 | _pcre_ucp_gentype[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE) |
| 155 | == (t == XCL_PROP)) |
| 156 | return !negated; |
| 157 | break; |
| 158 | |
| 159 | /* This should never occur, but compilers may mutter if there is no |
| 160 | default. */ |
| 161 | |
| 162 | default: |
| 163 | return FALSE; |
| 164 | } |
| 165 | |
| 166 | data += 2; |
| 167 | } |
| 168 | #endif /* SUPPORT_UCP */ |
| 169 | } |
| 170 | |
| 171 | return negated; /* char did not match */ |
| 172 | } |
| 173 | |
| 174 | /* End of pcre_xclass.c */ |