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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __AP_EXPR_PRIVATE_H__
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#define __AP_EXPR_PRIVATE_H__
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#include "httpd.h"
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#include "apr_strings.h"
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#include "apr_tables.h"
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#include "ap_expr.h"
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#ifndef YY_NULL
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#define YY_NULL 0
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#endif
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#ifndef MIN
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#endif
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#if !APR_HAVE_UNISTD_H
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#define YY_NO_UNISTD_H
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#endif
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#ifdef _MSC_VER
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/* Avoid some warnings with Visual Studio (likely due to a bug in bison) */
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#define YYMALLOC malloc
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#define YYFREE free
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#endif
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#ifndef YYDEBUG
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#define YYDEBUG 0
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#endif
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/** The operations in a parse tree node */
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typedef enum {
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op_NOP,
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op_True, op_False,
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op_Not, op_Or, op_And,
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op_Comp,
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op_EQ, op_NE, op_LT, op_LE, op_GT, op_GE, op_IN,
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op_REG, op_NRE,
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op_STR_EQ, op_STR_NE, op_STR_LT, op_STR_LE, op_STR_GT, op_STR_GE,
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op_Concat,
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op_Digit, op_String, op_Regex, op_RegexBackref,
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op_Var,
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op_ListElement,
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/*
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* call external functions/operators.
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* The info node contains the function pointer and some function specific
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* info.
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* For Binary operators, the Call node links to the Info node and the
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* Args node, which in turn links to the left and right operand.
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* For all other variants, the Call node links to the Info node and the
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* argument.
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*/
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op_UnaryOpCall, op_UnaryOpInfo,
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op_BinaryOpCall, op_BinaryOpInfo, op_BinaryOpArgs,
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op_StringFuncCall, op_StringFuncInfo,
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op_ListFuncCall, op_ListFuncInfo
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} ap_expr_node_op_e;
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/** The basic parse tree node */
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struct ap_expr_node {
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ap_expr_node_op_e node_op;
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const void *node_arg1;
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const void *node_arg2;
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};
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/** The context used by scanner and parser */
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typedef struct {
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/* internal state of the scanner */
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const char *inputbuf;
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int inputlen;
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const char *inputptr;
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void *scanner;
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char *scan_ptr;
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char scan_buf[MAX_STRING_LEN];
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char scan_del;
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int at_start;
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/* pools for result and temporary usage */
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apr_pool_t *pool;
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apr_pool_t *ptemp;
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/* The created parse tree */
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ap_expr_t *expr;
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const char *error;
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const char *error2;
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unsigned flags;
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/*
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* The function to use to lookup provider functions for variables
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* and funtctions
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*/
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ap_expr_lookup_fn_t *lookup_fn;
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} ap_expr_parse_ctx_t;
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/* flex/bison functions */
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int ap_expr_yyparse(ap_expr_parse_ctx_t *context);
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void ap_expr_yyerror(ap_expr_parse_ctx_t *context, const char *err);
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int ap_expr_yylex_init(void **scanner);
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int ap_expr_yylex_destroy(void *scanner);
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void ap_expr_yyset_extra(ap_expr_parse_ctx_t *context, void *scanner);
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/* create a parse tree node */
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ap_expr_t *ap_expr_make(ap_expr_node_op_e op, const void *arg1,
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const void *arg2, ap_expr_parse_ctx_t *ctx);
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/* create parse tree node for the string-returning function 'name' */
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ap_expr_t *ap_expr_str_func_make(const char *name, const ap_expr_t *arg,
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ap_expr_parse_ctx_t *ctx);
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/* create parse tree node for the list-returning function 'name' */
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ap_expr_t *ap_expr_list_func_make(const char *name, const ap_expr_t *arg,
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ap_expr_parse_ctx_t *ctx);
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/* create parse tree node for the variable 'name' */
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ap_expr_t *ap_expr_var_make(const char *name, ap_expr_parse_ctx_t *ctx);
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/* create parse tree node for the unary operator 'name' */
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ap_expr_t *ap_expr_unary_op_make(const char *name, const ap_expr_t *arg,
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ap_expr_parse_ctx_t *ctx);
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/* create parse tree node for the binary operator 'name' */
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ap_expr_t *ap_expr_binary_op_make(const char *name, const ap_expr_t *arg1,
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const ap_expr_t *arg2,
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ap_expr_parse_ctx_t *ctx);
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#endif /* __AP_EXPR_PRIVATE_H__ */
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/** @} */
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