1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 /* based on ap_expr_parse.y from mod_ssl */
19 /* _________________________________________________________________
22 ** _________________________________________________________________
28 %lex-param { void *yyscanner }
29 %parse-param { ap_expr_parse_ctx_t *ctx }
32 #include "util_expr_private.h"
42 %token T_FALSE "false"
44 %token T_EXPR_BOOL "boolean expression"
45 %token T_EXPR_STRING "string expression"
47 %token <cpVal> T_ERROR "error token"
49 %token <cpVal> T_DIGIT "number"
50 %token <cpVal> T_ID "identifier"
51 %token <cpVal> T_STRING "string literal"
53 %token T_REGEX "start of matching regex"
54 %token T_REGSUB "start of substitution regex"
55 %token <cpVal> T_REG_MATCH "pattern of the regex"
56 %token <cpVal> T_REG_SUBST "substitution of the regex"
57 %token <cpVal> T_REG_FLAGS "pattern flags of the regex"
58 %token <num> T_BACKREF "regex back reference"
60 %token <cpVal> T_OP_UNARY "unary operator"
61 %token <cpVal> T_OP_BINARY "binary operator"
63 %token T_STR_BEGIN "start of string"
64 %token T_STR_END "end of string"
65 %token T_VAR_BEGIN "start of variable name"
66 %token T_VAR_END "end of variable name"
67 %token T_VAREXP_BEGIN "start of variable expression"
68 %token T_VAREXP_END "end of variable expression"
70 %token T_OP_EQ "integer equal"
71 %token T_OP_NE "integer not equal"
72 %token T_OP_LT "integer less than"
73 %token T_OP_LE "integer less or equal"
74 %token T_OP_GT "integer greater than"
75 %token T_OP_GE "integer greater or equal"
76 %token T_OP_REG "regex match"
77 %token T_OP_NRE "regex non-match"
78 %token T_OP_IN "contained in"
79 %token T_OP_STR_EQ "string equal"
80 %token T_OP_STR_NE "string not equal"
81 %token T_OP_STR_LT "string less than"
82 %token T_OP_STR_LE "string less or equal"
83 %token T_OP_STR_GT "string greater than"
84 %token T_OP_STR_GE "string greater or equal"
86 %token T_OP_CONCAT "string concatenation"
88 %token T_OP_JOIN "join operator"
89 %token T_OP_SPLIT "split operator"
90 %token T_OP_SUB "substitute operator"
92 %token T_OP_OR "logical or"
93 %token T_OP_AND "logical and"
94 %token T_OP_NOT "logical not"
101 %type <exVal> cond "condition"
102 %type <exVal> comp "comparison"
103 %type <exVal> strfunc "string function"
104 %type <exVal> listfunc "list function"
105 %type <exVal> list "list"
106 %type <exVal> words "words"
107 %type <exVal> word "word"
108 %type <exVal> string "string"
109 %type <exVal> substr "substring"
110 %type <exVal> var "variable"
111 %type <exVal> regex "match regex"
112 %type <exVal> regsub "substitution regex"
113 %type <exVal> regany "any regex"
114 %type <exVal> split "split"
115 %type <exVal> join "join"
116 %type <exVal> sub "sub"
119 #include "util_expr_private.h"
120 #define yyscanner ctx->scanner
122 int ap_expr_yylex(YYSTYPE *lvalp, void *scanner);
128 expr : T_EXPR_STRING string { ctx->expr = $2; }
129 | T_EXPR_BOOL cond { ctx->expr = $2; }
130 | T_ERROR { YYABORT; }
133 string : substr { $$ = $1; }
134 | string substr { $$ = ap_expr_concat_make($1, $2, ctx); }
135 | T_ERROR { YYABORT; }
138 cond : T_TRUE { $$ = ap_expr_make(op_True, NULL, NULL, ctx); }
139 | T_FALSE { $$ = ap_expr_make(op_False, NULL, NULL, ctx); }
140 | T_OP_NOT cond { $$ = ap_expr_make(op_Not, $2, NULL, ctx); }
141 | cond T_OP_OR cond { $$ = ap_expr_make(op_Or, $1, $3, ctx); }
142 | cond T_OP_AND cond { $$ = ap_expr_make(op_And, $1, $3, ctx); }
143 | comp { $$ = ap_expr_make(op_Comp, $1, NULL, ctx); }
144 | T_OP_UNARY word { $$ = ap_expr_unary_op_make( $1, $2, ctx); }
145 | word T_OP_BINARY word { $$ = ap_expr_binary_op_make($2, $1, $3, ctx); }
146 | '(' cond ')' { $$ = $2; }
147 | T_ERROR { YYABORT; }
150 comp : word T_OP_EQ word { $$ = ap_expr_make(op_EQ, $1, $3, ctx); }
151 | word T_OP_NE word { $$ = ap_expr_make(op_NE, $1, $3, ctx); }
152 | word T_OP_LT word { $$ = ap_expr_make(op_LT, $1, $3, ctx); }
153 | word T_OP_LE word { $$ = ap_expr_make(op_LE, $1, $3, ctx); }
154 | word T_OP_GT word { $$ = ap_expr_make(op_GT, $1, $3, ctx); }
155 | word T_OP_GE word { $$ = ap_expr_make(op_GE, $1, $3, ctx); }
156 | word T_OP_STR_EQ word { $$ = ap_expr_make(op_STR_EQ, $1, $3, ctx); }
157 | word T_OP_STR_NE word { $$ = ap_expr_make(op_STR_NE, $1, $3, ctx); }
158 | word T_OP_STR_LT word { $$ = ap_expr_make(op_STR_LT, $1, $3, ctx); }
159 | word T_OP_STR_LE word { $$ = ap_expr_make(op_STR_LE, $1, $3, ctx); }
160 | word T_OP_STR_GT word { $$ = ap_expr_make(op_STR_GT, $1, $3, ctx); }
161 | word T_OP_STR_GE word { $$ = ap_expr_make(op_STR_GE, $1, $3, ctx); }
162 | word T_OP_REG regex { $$ = ap_expr_make(op_REG, $1, $3, ctx); }
163 | word T_OP_NRE regex { $$ = ap_expr_make(op_NRE, $1, $3, ctx); }
164 | word T_OP_IN list { $$ = ap_expr_make(op_IN, $1, $3, ctx); }
167 word : T_DIGIT { $$ = ap_expr_make(op_Digit, $1, NULL, ctx); }
168 | T_STR_BEGIN T_STR_END { $$ = ap_expr_make(op_String, "", NULL, ctx); }
169 | T_STR_BEGIN string T_STR_END { $$ = $2; }
170 | word T_OP_CONCAT word { $$ = ap_expr_make(op_Concat, $1, $3, ctx); }
174 | strfunc { $$ = $1; }
175 | '(' word ')' { $$ = $2; }
178 list : split { $$ = $1; }
179 | listfunc { $$ = $1; }
180 | '{' words '}' { $$ = $2; }
181 | '(' list ')' { $$ = $2; }
184 substr : T_STRING { $$ = ap_expr_make(op_String, $1, NULL, ctx); }
188 var : T_VAR_BEGIN T_ID T_VAR_END { $$ = ap_expr_var_make($2, ctx); }
189 | T_VAR_BEGIN T_ID ':' string T_VAR_END { $$ = ap_expr_str_func_make($2, $4, ctx); }
190 | T_VAREXP_BEGIN cond T_VAREXP_END { $$ = ap_expr_make(op_Bool, $2, NULL, ctx); }
191 | T_VAREXP_BEGIN word T_VAREXP_END { $$ = ap_expr_make(op_Word, $2, NULL, ctx); }
192 | T_BACKREF { $$ = ap_expr_backref_make($1, ctx); }
195 strfunc : T_ID '(' word ')' { $$ = ap_expr_str_func_make($1, $3, ctx); }
196 | T_ID '(' words ')' { $$ = ap_expr_str_func_make($1, $3, ctx); }
199 listfunc : T_ID '(' word ')' { $$ = ap_expr_list_func_make($1, $3, ctx); }
200 /* | T_ID '(' words ')' { $$ = ap_expr_list_func_make($1, $3, ctx); } */
203 sub : T_OP_SUB regsub ',' word { $$ = ap_expr_make(op_Sub, $4, $2, ctx); }
204 | T_OP_SUB '(' regsub ',' word ')' { $$ = ap_expr_make(op_Sub, $5, $3, ctx); }
207 join : T_OP_JOIN list { $$ = ap_expr_make(op_Join, $2, NULL, ctx); }
208 | T_OP_JOIN '(' list ')' { $$ = ap_expr_make(op_Join, $3, NULL, ctx); }
209 | T_OP_JOIN list ',' word { $$ = ap_expr_make(op_Join, $2, $4, ctx); }
210 | T_OP_JOIN '(' list ',' word ')' { $$ = ap_expr_make(op_Join, $3, $5, ctx); }
213 split : T_OP_SPLIT regany ',' list { $$ = ap_expr_make(op_Split, $4, $2, ctx); }
214 | T_OP_SPLIT '(' regany ',' list ')' { $$ = ap_expr_make(op_Split, $5, $3, ctx); }
215 | T_OP_SPLIT regany ',' word { $$ = ap_expr_make(op_Split, $4, $2, ctx); }
216 | T_OP_SPLIT '(' regany ',' word ')' { $$ = ap_expr_make(op_Split, $5, $3, ctx); }
219 words : word { $$ = ap_expr_make(op_ListElement, $1, NULL, ctx); }
220 | word ',' words { $$ = ap_expr_make(op_ListElement, $1, $3, ctx); }
223 regex : T_REGEX T_REG_MATCH T_REG_FLAGS {
224 ap_expr_t *e = ap_expr_regex_make($2, NULL, $3, ctx);
226 ctx->error = "Failed to compile regular expression";
232 regsub : T_REGSUB T_REG_MATCH string T_REG_FLAGS {
233 ap_expr_t *e = ap_expr_regex_make($2, $3, $4, ctx);
235 ctx->error = "Failed to compile regular expression";
241 regany : regex { $$ = $1; }
242 | regsub { $$ = $1; }
247 void yyerror(ap_expr_parse_ctx_t *ctx, const char *s)
249 /* s is allocated on the stack */
250 ctx->error = apr_pstrdup(ctx->ptemp, s);