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/*
* Copyright 2010, Lloyd Hilaiel.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. Neither the name of Lloyd Hilaiel nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
*/
#ifndef __YAJL_LEX_H__
#define __YAJL_LEX_H__
#include "api/yajl_common.h"
typedef enum {
yajl_tok_bool,
yajl_tok_colon,
yajl_tok_comma,
yajl_tok_eof,
yajl_tok_error,
yajl_tok_left_brace,
yajl_tok_left_bracket,
yajl_tok_null,
yajl_tok_right_brace,
yajl_tok_right_bracket,
/* we differentiate between integers and doubles to allow the
* parser to interpret the number without re-scanning */
yajl_tok_integer,
yajl_tok_double,
/* we differentiate between strings which require further processing,
* and strings that do not */
yajl_tok_string,
yajl_tok_string_with_escapes,
/* comment tokens are not currently returned to the parser, ever */
yajl_tok_comment
} yajl_tok;
typedef struct yajl_lexer_t * yajl_lexer;
YAJL_API
yajl_lexer yajl_lex_alloc(yajl_alloc_funcs * alloc,
unsigned int allowComments,
unsigned int validateUTF8);
YAJL_API
yajl_lexer yajl_lex_realloc(yajl_lexer orig);
YAJL_API
void yajl_lex_free(yajl_lexer lexer);
/**
* run/continue a lex. "offset" is an input/output parameter.
* It should be initialized to zero for a
* new chunk of target text, and upon subsetquent calls with the same
* target text should passed with the value of the previous invocation.
*
* the client may be interested in the value of offset when an error is
* returned from the lexer. This allows the client to render useful
n * error messages.
*
* When you pass the next chunk of data, context should be reinitialized
* to zero.
*
* Finally, the output buffer is usually just a pointer into the jsonText,
* however in cases where the entity being lexed spans multiple chunks,
* the lexer will buffer the entity and the data returned will be
* a pointer into that buffer.
*
* This behavior is abstracted from client code except for the performance
* implications which require that the client choose a reasonable chunk
* size to get adequate performance.
*/
YAJL_API
yajl_tok yajl_lex_lex(yajl_lexer lexer, const unsigned char * jsonText,
unsigned int jsonTextLen, unsigned int * offset,
const unsigned char ** outBuf, unsigned int * outLen);
/** have a peek at the next token, but don't move the lexer forward */
YAJL_API
yajl_tok yajl_lex_peek(yajl_lexer lexer, const unsigned char * jsonText,
unsigned int jsonTextLen, unsigned int offset);
typedef enum {
yajl_lex_e_ok = 0,
yajl_lex_string_invalid_utf8,
yajl_lex_string_invalid_escaped_char,
yajl_lex_string_invalid_json_char,
yajl_lex_string_invalid_hex_char,
yajl_lex_invalid_char,
yajl_lex_invalid_string,
yajl_lex_missing_integer_after_decimal,
yajl_lex_missing_integer_after_exponent,
yajl_lex_missing_integer_after_minus,
yajl_lex_unallowed_comment
} yajl_lex_error;
YAJL_API
const char * yajl_lex_error_to_string(yajl_lex_error error);
/** allows access to more specific information about the lexical
* error when yajl_lex_lex returns yajl_tok_error. */
YAJL_API
yajl_lex_error yajl_lex_get_error(yajl_lexer lexer);
/** get the current offset into the most recently lexed json string. */
YAJL_API
unsigned int yajl_lex_current_offset(yajl_lexer lexer);
/** get the number of lines lexed by this lexer instance */
YAJL_API
unsigned int yajl_lex_current_line(yajl_lexer lexer);
/** get the number of chars lexed by this lexer instance since the last
* \n or \r */
YAJL_API
unsigned int yajl_lex_current_char(yajl_lexer lexer);
#endif
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