/*
 * Copyright (C) Igor Sysoev
 */


#ifndef _NGX_HTTP_VARIABLES_H_INCLUDED_
#define _NGX_HTTP_VARIABLES_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_http.h>


#define NGX_HTTP_VARIABLE_NOT_FOUND  (ngx_http_variable_value_t *) -1


typedef struct {
    ngx_uint_t                     value;
    ngx_str_t                      text;
} ngx_http_variable_value_t;
    

typedef struct ngx_http_variable_s  ngx_http_variable_t;

typedef ngx_http_variable_value_t *
                (*ngx_http_get_variable_pt) (ngx_http_request_t *r, void *var);


struct ngx_http_variable_s {
    ngx_str_t                      name;
    ngx_uint_t                     index;
    ngx_http_get_variable_pt       handler;
    void                          *data;
    ngx_uint_t                     uses;
};


typedef ngx_http_variable_value_t *
    (*ngx_http_get_core_variable_pt) (ngx_http_request_t *r, uintptr_t data);

typedef struct {
    ngx_str_t                      name;
    ngx_http_get_core_variable_pt  handler;
    uintptr_t                      data;
} ngx_http_core_variable_t;


ngx_http_variable_t *ngx_http_add_variable(ngx_conf_t *cf);
ngx_int_t ngx_http_get_variable_index(ngx_http_core_main_conf_t *cmcf,
    ngx_str_t *name);
ngx_http_variable_value_t *ngx_http_get_indexed_variable(ngx_http_request_t *r,
    ngx_uint_t index);
ngx_http_variable_value_t *ngx_http_get_variable(ngx_http_request_t *r,
    ngx_str_t *name);
ngx_int_t ngx_http_core_variables_init(ngx_cycle_t *cycle);


#endif /* _NGX_HTTP_VARIABLES_H_INCLUDED_ */