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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* based on ap_expr_parse.y from mod_ssl */
/* _________________________________________________________________
**
** Expression Parser
** _________________________________________________________________
*/
%pure-parser
%error-verbose
%defines
%lex-param { void *yyscanner }
%parse-param { ap_expr_parse_ctx_t *ctx }
%{
#include "util_expr_private.h"
%}
%union {
char *cpVal;
ap_expr_t *exVal;
int num;
}
%token T_TRUE "true"
%token T_FALSE "false"
%token T_EXPR_BOOL "boolean expression"
%token T_EXPR_STRING "string expression"
%token <cpVal> T_ERROR "error token"
%token <cpVal> T_DIGIT "number"
%token <cpVal> T_ID "identifier"
%token <cpVal> T_STRING "string literal"
%token T_REGEX "start of matching regex"
%token T_REGSUB "start of substitution regex"
%token <cpVal> T_REG_MATCH "pattern of the regex"
%token <cpVal> T_REG_SUBST "substitution of the regex"
%token <cpVal> T_REG_FLAGS "pattern flags of the regex"
%token <num> T_BACKREF "regex back reference"
%token <cpVal> T_OP_UNARY "unary operator"
%token <cpVal> T_OP_BINARY "binary operator"
%token T_STR_BEGIN "start of string"
%token T_STR_END "end of string"
%token T_VAR_BEGIN "start of variable name"
%token T_VAR_END "end of variable name"
%token T_VAREXP_BEGIN "start of variable expression"
%token T_VAREXP_END "end of variable expression"
%token T_OP_EQ "integer equal"
%token T_OP_NE "integer not equal"
%token T_OP_LT "integer less than"
%token T_OP_LE "integer less or equal"
%token T_OP_GT "integer greater than"
%token T_OP_GE "integer greater or equal"
%token T_OP_REG "regex match"
%token T_OP_NRE "regex non-match"
%token T_OP_IN "contained in"
%token T_OP_STR_EQ "string equal"
%token T_OP_STR_NE "string not equal"
%token T_OP_STR_LT "string less than"
%token T_OP_STR_LE "string less or equal"
%token T_OP_STR_GT "string greater than"
%token T_OP_STR_GE "string greater or equal"
%token T_OP_CONCAT "string concatenation"
%token T_OP_JOIN "join operator"
%token T_OP_SPLIT "split operator"
%token T_OP_SUB "substitute operator"
%token T_OP_OR "logical or"
%token T_OP_AND "logical and"
%token T_OP_NOT "logical not"
%left T_OP_OR
%left T_OP_AND
%right T_OP_NOT
%right T_OP_CONCAT
%nterm <exVal> cond
%nterm <exVal> comp
%nterm <exVal> strfunc
%nterm <exVal> listfunc
%nterm <exVal> list
%nterm <exVal> words
%nterm <exVal> word
%nterm <exVal> string
%nterm <exVal> substr
%nterm <exVal> var
%nterm <exVal> regex
%nterm <exVal> regsub
%nterm <exVal> regany
%nterm <exVal> split
%nterm <exVal> join
%nterm <exVal> sub
%{
#include "util_expr_private.h"
#define yyscanner ctx->scanner
int ap_expr_yylex(YYSTYPE *lvalp, void *scanner);
%}
%%
expr : T_EXPR_STRING string { ctx->expr = $2; }
| T_EXPR_BOOL cond { ctx->expr = $2; }
| T_ERROR { YYABORT; }
;
string : substr { $$ = $1; }
| string substr { $$ = ap_expr_concat_make($1, $2, ctx); }
| T_ERROR { YYABORT; }
;
cond : T_TRUE { $$ = ap_expr_make(op_True, NULL, NULL, ctx); }
| T_FALSE { $$ = ap_expr_make(op_False, NULL, NULL, ctx); }
| T_OP_NOT cond { $$ = ap_expr_make(op_Not, $2, NULL, ctx); }
| cond T_OP_OR cond { $$ = ap_expr_make(op_Or, $1, $3, ctx); }
| cond T_OP_AND cond { $$ = ap_expr_make(op_And, $1, $3, ctx); }
| comp { $$ = ap_expr_make(op_Comp, $1, NULL, ctx); }
| T_OP_UNARY word { $$ = ap_expr_unary_op_make( $1, $2, ctx); }
| word T_OP_BINARY word { $$ = ap_expr_binary_op_make($2, $1, $3, ctx); }
| '(' cond ')' { $$ = $2; }
| T_ERROR { YYABORT; }
;
comp : word T_OP_EQ word { $$ = ap_expr_make(op_EQ, $1, $3, ctx); }
| word T_OP_NE word { $$ = ap_expr_make(op_NE, $1, $3, ctx); }
| word T_OP_LT word { $$ = ap_expr_make(op_LT, $1, $3, ctx); }
| word T_OP_LE word { $$ = ap_expr_make(op_LE, $1, $3, ctx); }
| word T_OP_GT word { $$ = ap_expr_make(op_GT, $1, $3, ctx); }
| word T_OP_GE word { $$ = ap_expr_make(op_GE, $1, $3, ctx); }
| word T_OP_STR_EQ word { $$ = ap_expr_make(op_STR_EQ, $1, $3, ctx); }
| word T_OP_STR_NE word { $$ = ap_expr_make(op_STR_NE, $1, $3, ctx); }
| word T_OP_STR_LT word { $$ = ap_expr_make(op_STR_LT, $1, $3, ctx); }
| word T_OP_STR_LE word { $$ = ap_expr_make(op_STR_LE, $1, $3, ctx); }
| word T_OP_STR_GT word { $$ = ap_expr_make(op_STR_GT, $1, $3, ctx); }
| word T_OP_STR_GE word { $$ = ap_expr_make(op_STR_GE, $1, $3, ctx); }
| word T_OP_REG regex { $$ = ap_expr_make(op_REG, $1, $3, ctx); }
| word T_OP_NRE regex { $$ = ap_expr_make(op_NRE, $1, $3, ctx); }
| word T_OP_IN list { $$ = ap_expr_make(op_IN, $1, $3, ctx); }
;
word : T_DIGIT { $$ = ap_expr_make(op_Digit, $1, NULL, ctx); }
| T_STR_BEGIN T_STR_END { $$ = ap_expr_make(op_String, "", NULL, ctx); }
| T_STR_BEGIN string T_STR_END { $$ = $2; }
| word T_OP_CONCAT word { $$ = ap_expr_make(op_Concat, $1, $3, ctx); }
| var { $$ = $1; }
| sub { $$ = $1; }
| join { $$ = $1; }
| strfunc { $$ = $1; }
| '(' word ')' { $$ = $2; }
;
list : split { $$ = $1; }
| listfunc { $$ = $1; }
| '{' words '}' { $$ = $2; }
| '(' list ')' { $$ = $2; }
;
substr : T_STRING { $$ = ap_expr_make(op_String, $1, NULL, ctx); }
| var { $$ = $1; }
;
var : T_VAR_BEGIN T_ID T_VAR_END { $$ = ap_expr_var_make($2, ctx); }
| T_VAR_BEGIN T_ID ':' string T_VAR_END { $$ = ap_expr_str_func_make($2, $4, ctx); }
| T_VAREXP_BEGIN cond T_VAREXP_END { $$ = ap_expr_make(op_Bool, $2, NULL, ctx); }
| T_VAREXP_BEGIN word T_VAREXP_END { $$ = ap_expr_make(op_Word, $2, NULL, ctx); }
| T_BACKREF { $$ = ap_expr_backref_make($1, ctx); }
;
strfunc : T_ID '(' word ')' { $$ = ap_expr_str_func_make($1, $3, ctx); }
| T_ID '(' words ')' { $$ = ap_expr_str_func_make($1, $3, ctx); }
;
listfunc : T_ID '(' word ')' { $$ = ap_expr_list_func_make($1, $3, ctx); }
/* | T_ID '(' words ')' { $$ = ap_expr_list_func_make($1, $3, ctx); } */
;
sub : T_OP_SUB regsub ',' word { $$ = ap_expr_make(op_Sub, $4, $2, ctx); }
| T_OP_SUB '(' regsub ',' word ')' { $$ = ap_expr_make(op_Sub, $5, $3, ctx); }
;
join : T_OP_JOIN list { $$ = ap_expr_make(op_Join, $2, NULL, ctx); }
| T_OP_JOIN '(' list ')' { $$ = ap_expr_make(op_Join, $3, NULL, ctx); }
| T_OP_JOIN list ',' word { $$ = ap_expr_make(op_Join, $2, $4, ctx); }
| T_OP_JOIN '(' list ',' word ')' { $$ = ap_expr_make(op_Join, $3, $5, ctx); }
;
split : T_OP_SPLIT regany ',' list { $$ = ap_expr_make(op_Split, $4, $2, ctx); }
| T_OP_SPLIT '(' regany ',' list ')' { $$ = ap_expr_make(op_Split, $5, $3, ctx); }
| T_OP_SPLIT regany ',' word { $$ = ap_expr_make(op_Split, $4, $2, ctx); }
| T_OP_SPLIT '(' regany ',' word ')' { $$ = ap_expr_make(op_Split, $5, $3, ctx); }
;
words : word { $$ = ap_expr_make(op_ListElement, $1, NULL, ctx); }
| word ',' words { $$ = ap_expr_make(op_ListElement, $1, $3, ctx); }
;
regex : T_REGEX T_REG_MATCH T_REG_FLAGS {
ap_expr_t *e = ap_expr_regex_make($2, NULL, $3, ctx);
if (!e) {
ctx->error = "Failed to compile regular expression";
YYERROR;
}
$$ = e;
}
;
regsub : T_REGSUB T_REG_MATCH string T_REG_FLAGS {
ap_expr_t *e = ap_expr_regex_make($2, $3, $4, ctx);
if (!e) {
ctx->error = "Failed to compile regular expression";
YYERROR;
}
$$ = e;
}
;
regany : regex { $$ = $1; }
| regsub { $$ = $1; }
;
%%
void yyerror(ap_expr_parse_ctx_t *ctx, const char *s)
{
/* s is allocated on the stack */
ctx->error = apr_pstrdup(ctx->ptemp, s);
}
|
