/* Copyright 2005-2006 Garrett Rooney.
 *
 * Licensed 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 ETL_COMMON_H
#define ETL_COMMON_H

#include "etl_template.h"

typedef enum {
  ETL_NODE_PRINT,
  ETL_NODE_IF,
  ETL_NODE_UNLESS,
  ETL_NODE_FOR,
  ETL_NODE_LITERAL,
  ETL_NODE_FILTER
} etl_template_node_type_t;

typedef struct etl_template_node_t etl_template_node_t;

typedef struct {
  char *var;
  etl_template_node_t *yes_task;
  etl_template_node_t *no_task;
} etl_if_contents_t;

typedef struct {
  char *var;
  char *arr;
  etl_template_node_t *task;
} etl_for_contents_t;

typedef struct {
  char *var;
} etl_print_contents_t;

typedef struct {
  char *data;
} etl_literal_contents_t;

typedef enum {
  etl_template_filter_html = 0,
  etl_template_filter_xml  = 1,
  etl_template_filter_url  = 2
} etl_template_filter_type_t;

typedef struct {
  char *var;
  etl_template_filter_type_t filter;
} etl_filter_contents_t;

struct etl_template_node_t {
  etl_template_node_type_t type;

  /* note: contents with a size == sizeof (void *) are stored inline,
   *       others get stored as a pointer so we can minimize the size
   *       of the contents union. */
  union {
    etl_if_contents_t *i;
    etl_for_contents_t *f;
    etl_print_contents_t p;
    etl_literal_contents_t l;
    etl_filter_contents_t *flt;
  } contents;

  etl_template_node_t *next;
};

struct etl_template_t {
  etl_template_node_t *tree;
};

typedef struct {
  apr_pool_t *pool;
  etl_template_t *tmpl;
  const char *error;
} etl_parser_state_t;

void *etl_parser_alloc (void *(*alloc_func) (size_t));

void etl_parser_parse (void *parser,
                       int token,
                       char *data,
                       etl_parser_state_t *state);

void etl_parser_free (void *parser, void (*free_func) (void *));

/* Force Lemon to produce the kind of symbols I want... */
#define etl_parser_parseAlloc etl_parser_alloc
#define etl_parser_parseFree etl_parser_free
#define etl_parser_parseTokenName etl_parser_token_name
#define etl_parser_parseTrace etl_parser_trace

#endif /* ETL_COMMON_H */