| /* Copyright 2001-2004 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* _ _ |
| * _ __ ___ ___ __| | ___ ___| | |
| * | '_ ` _ \ / _ \ / _` | / __/ __| | |
| * | | | | | | (_) | (_| | \__ \__ \ | mod_ssl - Apache Interface to OpenSSL |
| * |_| |_| |_|\___/ \__,_|___|___/___/_| http://www.modssl.org/ |
| * |_____| |
| * ssl_expr_parse.y |
| * Expression LR(1) Parser |
| */ |
| /* ``What you see is all you get.'' |
| -- Brian Kernighan */ |
| |
| /* _________________________________________________________________ |
| ** |
| ** Expression Parser |
| ** _________________________________________________________________ |
| */ |
| |
| %{ |
| #include "ssl_private.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 { |
| ap_regex_t *regex; |
| if ((regex = ap_pregcomp(ssl_expr_info.pool, $1, |
| AP_REG_EXTENDED|AP_REG_NOSUB)) == NULL) { |
| ssl_expr_error = "Failed to compile regular expression"; |
| YYERROR; |
| } |
| $$ = ssl_expr_make(op_Regex, regex, NULL); |
| } |
| | T_REGEX_I { |
| ap_regex_t *regex; |
| if ((regex = ap_pregcomp(ssl_expr_info.pool, $1, |
| AP_REG_EXTENDED|AP_REG_NOSUB|AP_REG_ICASE)) == NULL) { |
| ssl_expr_error = "Failed to compile regular expression"; |
| YYERROR; |
| } |
| $$ = 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; |
| } |
| |