/*
**  OSSP var - Variable Expansion
**  Copyright (c) 2001-2002 The OSSP Project (http://www.ossp.org/)
**  Copyright (c) 2001-2002 Cable & Wireless Deutschland (http://www.cw.com/de/)
**
**  This file is part of OSSP var, a variable expansion
**  library which can be found at http://www.ossp.org/pkg/var/.
**
**  Permission to use, copy, modify, and distribute this software for
**  any purpose with or without fee is hereby granted, provided that
**  the above copyright notice and this permission notice appear in all
**  copies.
**
**  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
**  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
**  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
**  IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
**  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
**  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
**  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
**  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
**  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
**  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
**  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
**  SUCH DAMAGE.
**
**  var.h: library API
*/

#ifndef __VAR_H__
#define __VAR_H__

#include <stdlib.h>

/* Error codes */
typedef enum {
    VAR_ERR_CALLBACK                        = -64,
    VAR_ERR_INVALID_CHAR_IN_LOOP_LIMITS     = -42,
    VAR_ERR_UNTERMINATED_LOOP_CONSTRUCT     = -41,
    VAR_ERR_DIVISION_BY_ZERO_IN_INDEX       = -40,
    VAR_ERR_UNCLOSED_BRACKET_IN_INDEX       = -39,
    VAR_ERR_INCOMPLETE_INDEX_SPEC           = -37,
    VAR_ERR_INVALID_CHAR_IN_INDEX_SPEC      = -36,
    VAR_ERR_ARRAY_LOOKUPS_ARE_UNSUPPORTED   = -35,
    VAR_ERR_INCOMPLETE_QUOTED_PAIR          = -34,
    VAR_ERR_INVALID_ARGUMENT                = -34,
    VAR_ERR_SUBMATCH_OUT_OF_RANGE           = -33,
    VAR_ERR_UNKNOWN_QUOTED_PAIR_IN_REPLACE  = -32,
    VAR_ERR_EMPTY_PADDING_FILL_STRING       = -31,
    VAR_ERR_MISSING_PADDING_WIDTH           = -30,
    VAR_ERR_MALFORMATTED_PADDING            = -29,
    VAR_ERR_INCORRECT_TRANSPOSE_CLASS_SPEC  = -28,
    VAR_ERR_EMPTY_TRANSPOSE_CLASS           = -27,
    VAR_ERR_TRANSPOSE_CLASSES_MISMATCH      = -26,
    VAR_ERR_MALFORMATTED_TRANSPOSE          = -25,
    VAR_ERR_OFFSET_LOGIC                    = -24,
    VAR_ERR_OFFSET_OUT_OF_BOUNDS            = -23,
    VAR_ERR_RANGE_OUT_OF_BOUNDS             = -22,
    VAR_ERR_INVALID_OFFSET_DELIMITER        = -21,
    VAR_ERR_MISSING_START_OFFSET            = -20,
    VAR_ERR_EMPTY_SEARCH_STRING             = -19,
    VAR_ERR_MISSING_PARAMETER_IN_COMMAND    = -18,
    VAR_ERR_INVALID_REGEX_IN_REPLACE        = -17,
    VAR_ERR_UNKNOWN_REPLACE_FLAG            = -16,
    VAR_ERR_MALFORMATTED_REPLACE            = -15,
    VAR_ERR_UNKNOWN_COMMAND_CHAR            = -14,
    VAR_ERR_INPUT_ISNT_TEXT_NOR_VARIABLE    = -13,
    VAR_ERR_UNDEFINED_VARIABLE              = -12,
    VAR_ERR_INCOMPLETE_VARIABLE_SPEC        = -11,
    VAR_ERR_OUT_OF_MEMORY                   = -10,
    VAR_ERR_INVALID_CONFIGURATION           =  -9,
    VAR_ERR_INCORRECT_CLASS_SPEC            =  -8,
    VAR_ERR_INCOMPLETE_GROUPED_HEX          =  -7,
    VAR_ERR_INCOMPLETE_OCTAL                =  -6,
    VAR_ERR_INVALID_OCTAL                   =  -5,
    VAR_ERR_OCTAL_TOO_LARGE                 =  -4,
    VAR_ERR_INVALID_HEX                     =  -3,
    VAR_ERR_INCOMPLETE_HEX                  =  -2,
    VAR_ERR_INCOMPLETE_NAMED_CHARACTER      =  -1,
    VAR_OK = 0
} var_rc_t;

/* Expand quoted pairs to their binary representation. */
var_rc_t var_unescape(const char *src, size_t len, char *dst, int unescape_all);

/* Prototype for the lookup callback used in var_expand(). */
typedef var_rc_t (*var_cb_t)(
    void *context,
    const char *varname, size_t name_len, int idx,
    const char **data, size_t *data_len,
    size_t *buffer_size
);

/* Configure the var_expand() parser's tokens. */
typedef struct {
    char varinit;        /* '$' */
    char startdelim;     /* '{' */
    char enddelim;       /* '}' */
    char startindex;     /* '[' */
    char endindex;       /* ']' */
    char current_index;  /* '#' */
    char escape;         /* '\' */
    char *namechars;     /* 'a-zA-Z0-9_' */
} var_config_t;

/* The default configuration */
extern const var_config_t var_config_default;

/* Expand variable expressions in a text buffer. */
var_rc_t var_expand(const char *input, size_t input_len,
                    char **result, size_t *result_len,
                    var_cb_t lookup, void *lookup_context,
                    const var_config_t *config, int force_expand);

/* Map an error code to a text message. */
const char *var_strerror(var_rc_t rc);

/* Unique library identifier. */
extern const char var_id[];

#endif /* __VAR_H__ */