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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.
*/
#ifndef __AP_EXPR_PRIVATE_H__
#define __AP_EXPR_PRIVATE_H__
#include "httpd.h"
#include "apr_strings.h"
#include "apr_tables.h"
#include "ap_expr.h"
#ifndef YY_NULL
#define YY_NULL 0
#endif
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
#if !APR_HAVE_UNISTD_H
#define YY_NO_UNISTD_H
#endif
#ifdef _MSC_VER
/* Avoid some warnings with Visual Studio (likely due to a bug in bison) */
#define YYMALLOC malloc
#define YYFREE free
#endif
#ifndef YYDEBUG
#define YYDEBUG 0
#endif
/** The operations in a parse tree node */
typedef enum {
op_NOP,
op_True, op_False,
op_Not, op_Or, op_And,
op_Comp,
op_EQ, op_NE, op_LT, op_LE, op_GT, op_GE, op_IN,
op_REG, op_NRE,
op_STR_EQ, op_STR_NE, op_STR_LT, op_STR_LE, op_STR_GT, op_STR_GE,
op_Concat,
op_Digit, op_String, op_Regex, op_RegexBackref,
op_Var,
op_ListElement,
/*
* call external functions/operators.
* The info node contains the function pointer and some function specific
* info.
* For Binary operators, the Call node links to the Info node and the
* Args node, which in turn links to the left and right operand.
* For all other variants, the Call node links to the Info node and the
* argument.
*/
op_UnaryOpCall, op_UnaryOpInfo,
op_BinaryOpCall, op_BinaryOpInfo, op_BinaryOpArgs,
op_StringFuncCall, op_StringFuncInfo,
op_ListFuncCall, op_ListFuncInfo
} ap_expr_node_op_e;
/** The basic parse tree node */
struct ap_expr_node {
ap_expr_node_op_e node_op;
const void *node_arg1;
const void *node_arg2;
};
/** The context used by scanner and parser */
typedef struct {
/* internal state of the scanner */
const char *inputbuf;
int inputlen;
const char *inputptr;
void *scanner;
char *scan_ptr;
char scan_buf[MAX_STRING_LEN];
char scan_del;
int at_start;
/* pools for result and temporary usage */
apr_pool_t *pool;
apr_pool_t *ptemp;
/* The created parse tree */
ap_expr_t *expr;
const char *error;
const char *error2;
unsigned flags;
/*
* The function to use to lookup provider functions for variables
* and funtctions
*/
ap_expr_lookup_fn_t *lookup_fn;
} ap_expr_parse_ctx_t;
/* flex/bison functions */
int ap_expr_yyparse(ap_expr_parse_ctx_t *context);
void ap_expr_yyerror(ap_expr_parse_ctx_t *context, const char *err);
int ap_expr_yylex_init(void **scanner);
int ap_expr_yylex_destroy(void *scanner);
void ap_expr_yyset_extra(ap_expr_parse_ctx_t *context, void *scanner);
/* create a parse tree node */
ap_expr_t *ap_expr_make(ap_expr_node_op_e op, const void *arg1,
const void *arg2, ap_expr_parse_ctx_t *ctx);
/* create parse tree node for the string-returning function 'name' */
ap_expr_t *ap_expr_str_func_make(const char *name, const ap_expr_t *arg,
ap_expr_parse_ctx_t *ctx);
/* create parse tree node for the list-returning function 'name' */
ap_expr_t *ap_expr_list_func_make(const char *name, const ap_expr_t *arg,
ap_expr_parse_ctx_t *ctx);
/* create parse tree node for the variable 'name' */
ap_expr_t *ap_expr_var_make(const char *name, ap_expr_parse_ctx_t *ctx);
/* create parse tree node for the unary operator 'name' */
ap_expr_t *ap_expr_unary_op_make(const char *name, const ap_expr_t *arg,
ap_expr_parse_ctx_t *ctx);
/* create parse tree node for the binary operator 'name' */
ap_expr_t *ap_expr_binary_op_make(const char *name, const ap_expr_t *arg1,
const ap_expr_t *arg2,
ap_expr_parse_ctx_t *ctx);
#endif /* __AP_EXPR_PRIVATE_H__ */
/** @} */
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