Annotation of win32/pcre/pcre_xclass.c, revision 1.1
1.1 ! misha 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) 1997-2008 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 (one that contains characters whose values are > 255). It is used by both
! 43: pcre_exec() and pcre_def_exec(). */
! 44:
! 45:
! 46: #ifdef HAVE_CONFIG_H
! 47: #include "config.h"
! 48: #endif
! 49:
! 50: #include "pcre_internal.h"
! 51:
! 52:
! 53: /*************************************************
! 54: * Match character against an XCLASS *
! 55: *************************************************/
! 56:
! 57: /* This function is called to match a character against an extended class that
! 58: might contain values > 255.
! 59:
! 60: Arguments:
! 61: c the character
! 62: data points to the flag byte of the XCLASS data
! 63:
! 64: Returns: TRUE if character matches, else FALSE
! 65: */
! 66:
! 67: BOOL
! 68: _pcre_xclass(int c, const uschar *data)
! 69: {
! 70: int t;
! 71: BOOL negated = (*data & XCL_NOT) != 0;
! 72:
! 73: /* Character values < 256 are matched against a bitmap, if one is present. If
! 74: not, we still carry on, because there may be ranges that start below 256 in the
! 75: additional data. */
! 76:
! 77: if (c < 256)
! 78: {
! 79: if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
! 80: return !negated; /* char found */
! 81: }
! 82:
! 83: /* First skip the bit map if present. Then match against the list of Unicode
! 84: properties or large chars or ranges that end with a large char. We won't ever
! 85: encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
! 86:
! 87: if ((*data++ & XCL_MAP) != 0) data += 32;
! 88:
! 89: while ((t = *data++) != XCL_END)
! 90: {
! 91: int x, y;
! 92: if (t == XCL_SINGLE)
! 93: {
! 94: GETCHARINC(x, data);
! 95: if (c == x) return !negated;
! 96: }
! 97: else if (t == XCL_RANGE)
! 98: {
! 99: GETCHARINC(x, data);
! 100: GETCHARINC(y, data);
! 101: if (c >= x && c <= y) return !negated;
! 102: }
! 103:
! 104: #ifdef SUPPORT_UCP
! 105: else /* XCL_PROP & XCL_NOTPROP */
! 106: {
! 107: int chartype, script;
! 108: int category = _pcre_ucp_findprop(c, &chartype, &script);
! 109:
! 110: switch(*data)
! 111: {
! 112: case PT_ANY:
! 113: if (t == XCL_PROP) return !negated;
! 114: break;
! 115:
! 116: case PT_LAMP:
! 117: if ((chartype == ucp_Lu || chartype == ucp_Ll || chartype == ucp_Lt) ==
! 118: (t == XCL_PROP)) return !negated;
! 119: break;
! 120:
! 121: case PT_GC:
! 122: if ((data[1] == category) == (t == XCL_PROP)) return !negated;
! 123: break;
! 124:
! 125: case PT_PC:
! 126: if ((data[1] == chartype) == (t == XCL_PROP)) return !negated;
! 127: break;
! 128:
! 129: case PT_SC:
! 130: if ((data[1] == script) == (t == XCL_PROP)) return !negated;
! 131: break;
! 132:
! 133: /* This should never occur, but compilers may mutter if there is no
! 134: default. */
! 135:
! 136: default:
! 137: return FALSE;
! 138: }
! 139:
! 140: data += 2;
! 141: }
! 142: #endif /* SUPPORT_UCP */
! 143: }
! 144:
! 145: return negated; /* char did not match */
! 146: }
! 147:
! 148: /* End of pcre_xclass.c */
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