author | Simon Howkins <simonh@symbian.org> |
Mon, 15 Nov 2010 14:53:34 +0000 | |
branch | RCL_3 |
changeset 105 | 871af676edac |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/************************************************* |
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* Perl-Compatible Regular Expressions * |
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*************************************************/ |
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/* PCRE is a library of functions to support regular expressions whose syntax |
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and semantics are as close as possible to those of the Perl 5 language. |
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Written by Philip Hazel |
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Copyright (c) 1997-2005 University of Cambridge |
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|
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----------------------------------------------------------------------------- |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are met: |
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|
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* Redistributions of source code must retain the above copyright notice, |
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this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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|
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* Neither the name of the University of Cambridge nor the names of its |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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POSSIBILITY OF SUCH DAMAGE. |
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----------------------------------------------------------------------------- |
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*/ |
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|
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/* This module contains the external function pcre_maketables(), which builds |
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character tables for PCRE in the current locale. The file is compiled on its |
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own as part of the PCRE library. However, it is also included in the |
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compilation of dftables.c, in which case the macro DFTABLES is defined. */ |
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#ifndef DFTABLES |
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#include "pcre_internal.h" |
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#endif |
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/************************************************* |
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* Create PCRE character tables * |
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*************************************************/ |
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|
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/* This function builds a set of character tables for use by PCRE and returns |
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a pointer to them. They are build using the ctype functions, and consequently |
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their contents will depend upon the current locale setting. When compiled as |
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part of the library, the store is obtained via pcre_malloc(), but when compiled |
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inside dftables, use malloc(). |
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|
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Arguments: none |
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Returns: pointer to the contiguous block of data |
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*/ |
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const unsigned char * |
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pcre_maketables(void) |
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{ |
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unsigned char *yield, *p; |
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int i; |
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#ifndef DFTABLES |
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yield = (unsigned char*)(pcre_malloc)(tables_length); |
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#else |
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yield = (unsigned char*)malloc(tables_length); |
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#endif |
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if (yield == NULL) return NULL; |
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p = yield; |
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/* First comes the lower casing table */ |
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for (i = 0; i < 256; i++) *p++ = tolower(i); |
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/* Next the case-flipping table */ |
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for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i); |
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/* Then the character class tables. Don't try to be clever and save effort |
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on exclusive ones - in some locales things may be different. Note that the |
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table for "space" includes everything "isspace" gives, including VT in the |
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default locale. This makes it work for the POSIX class [:space:]. */ |
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memset(p, 0, cbit_length); |
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for (i = 0; i < 256; i++) |
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{ |
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if (isdigit(i)) |
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{ |
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p[cbit_digit + i/8] |= 1 << (i&7); |
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p[cbit_word + i/8] |= 1 << (i&7); |
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} |
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if (isupper(i)) |
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{ |
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p[cbit_upper + i/8] |= 1 << (i&7); |
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p[cbit_word + i/8] |= 1 << (i&7); |
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} |
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if (islower(i)) |
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{ |
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p[cbit_lower + i/8] |= 1 << (i&7); |
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p[cbit_word + i/8] |= 1 << (i&7); |
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111 |
} |
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if (i == '_') p[cbit_word + i/8] |= 1 << (i&7); |
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if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7); |
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if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7); |
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if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7); |
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if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7); |
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if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7); |
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if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7); |
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} |
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p += cbit_length; |
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121 |
|
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/* Finally, the character type table. In this, we exclude VT from the white |
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space chars, because Perl doesn't recognize it as such for \s and for comments |
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within regexes. */ |
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/* But no, in JavaScriptCore we don't, so that's commented out below. */ |
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126 |
|
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for (i = 0; i < 256; i++) |
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128 |
{ |
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int x = 0; |
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if (/*i != 0x0b && */ isspace(i)) x += ctype_space; |
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if (isalpha(i)) x += ctype_letter; |
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if (isdigit(i)) x += ctype_digit; |
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if (isxdigit(i)) x += ctype_xdigit; |
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if (isalnum(i) || i == '_') x += ctype_word; |
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135 |
|
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/* Note: strchr includes the terminating zero in the characters it considers. |
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In this instance, that is ok because we want binary zero to be flagged as a |
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meta-character, which in this sense is any character that terminates a run |
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of data characters. */ |
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140 |
|
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if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta; *p++ = x; } |
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142 |
|
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return yield; |
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} |
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145 |
|
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/* End of pcre_maketables.c */ |