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|
/* _ _
** _ __ ___ ___ __| | ___ ___| |
** | '_ ` _ \ / _ \ / _` | / __/ __| |
** | | | | | | (_) | (_| | \__ \__ \ | mod_ssl - Apache Interface to OpenSSL
** |_| |_| |_|\___/ \__,_|___|___/___/_| http://www.modssl.org/
** |_____|
** ssl_expr_parse.y
** Expression LR(1) Parser
*/
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*/
/* ``What you see is all you get.''
-- Brian Kernighan */
/* _________________________________________________________________
**
** Expression Parser
** _________________________________________________________________
*/
%{
#include "mod_ssl.h"
%}
%union {
char *cpVal;
ssl_expr *exVal;
}
%token T_TRUE
%token T_FALSE
%token <cpVal> T_DIGIT
%token <cpVal> T_ID
%token <cpVal> T_STRING
%token <cpVal> T_REGEX
%token <cpVal> T_REGEX_I
%token T_FUNC_FILE
%token T_OP_EQ
%token T_OP_NE
%token T_OP_LT
%token T_OP_LE
%token T_OP_GT
%token T_OP_GE
%token T_OP_REG
%token T_OP_NRE
%token T_OP_IN
%token T_OP_OR
%token T_OP_AND
%token T_OP_NOT
%left T_OP_OR
%left T_OP_AND
%left T_OP_NOT
%type <exVal> expr
%type <exVal> comparison
%type <exVal> funccall
%type <exVal> regex
%type <exVal> words
%type <exVal> word
%%
root : expr { ssl_expr_info.expr = $1; }
;
expr : T_TRUE { $$ = ssl_expr_make(op_True, NULL, NULL); }
| T_FALSE { $$ = ssl_expr_make(op_False, NULL, NULL); }
| T_OP_NOT expr { $$ = ssl_expr_make(op_Not, $2, NULL); }
| expr T_OP_OR expr { $$ = ssl_expr_make(op_Or, $1, $3); }
| expr T_OP_AND expr { $$ = ssl_expr_make(op_And, $1, $3); }
| comparison { $$ = ssl_expr_make(op_Comp, $1, NULL); }
| '(' expr ')' { $$ = $2; }
;
comparison: word T_OP_EQ word { $$ = ssl_expr_make(op_EQ, $1, $3); }
| word T_OP_NE word { $$ = ssl_expr_make(op_NE, $1, $3); }
| word T_OP_LT word { $$ = ssl_expr_make(op_LT, $1, $3); }
| word T_OP_LE word { $$ = ssl_expr_make(op_LE, $1, $3); }
| word T_OP_GT word { $$ = ssl_expr_make(op_GT, $1, $3); }
| word T_OP_GE word { $$ = ssl_expr_make(op_GE, $1, $3); }
| word T_OP_IN '{' words '}' { $$ = ssl_expr_make(op_IN, $1, $4); }
| word T_OP_REG regex { $$ = ssl_expr_make(op_REG, $1, $3); }
| word T_OP_NRE regex { $$ = ssl_expr_make(op_NRE, $1, $3); }
;
words : word { $$ = ssl_expr_make(op_ListElement, $1, NULL); }
| words ',' word { $$ = ssl_expr_make(op_ListElement, $3, $1); }
;
word : T_DIGIT { $$ = ssl_expr_make(op_Digit, $1, NULL); }
| T_STRING { $$ = ssl_expr_make(op_String, $1, NULL); }
| '%' '{' T_ID '}' { $$ = ssl_expr_make(op_Var, $3, NULL); }
| funccall { $$ = $1; }
;
regex : T_REGEX {
regex_t *regex;
if ((regex = ap_pregcomp(ssl_expr_info.pool, $1,
REG_EXTENDED|REG_NOSUB)) == NULL) {
ssl_expr_error = "Failed to compile regular expression";
YYERROR;
}
$$ = ssl_expr_make(op_Regex, regex, NULL);
}
| T_REGEX_I {
regex_t *regex;
if ((regex = ap_pregcomp(ssl_expr_info.pool, $1,
REG_EXTENDED|REG_NOSUB|REG_ICASE)) == NULL) {
ssl_expr_error = "Failed to compile regular expression";
YYERROR;
}
$$ = ssl_expr_make(op_Regex, regex, NULL);
}
;
funccall : T_FUNC_FILE '(' T_STRING ')' {
ssl_expr *args = ssl_expr_make(op_ListElement, $3, NULL);
$$ = ssl_expr_make(op_Func, "file", args);
}
;
%%
int yyerror(char *s)
{
ssl_expr_error = s;
return 2;
}
|
