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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__ */
+/** @} */
+