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/*
* Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
*
* Permission to use, copy, modify, and/or 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.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#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_inf,
yajl_tok_minus_inf,
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_lexer yajl_lex_alloc(yajl_alloc_funcs * alloc,
unsigned int allowComments,
unsigned int validateUTF8);
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
* 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_tok yajl_lex_lex(yajl_lexer lexer, const unsigned char * jsonText,
size_t jsonTextLen, size_t * offset,
const unsigned char ** outBuf, size_t * outLen);
/** have a peek at the next token, but don't move the lexer forward */
yajl_tok yajl_lex_peek(yajl_lexer lexer, const unsigned char * jsonText,
size_t jsonTextLen, size_t 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_invalid_infinity,
yajl_lex_unallowed_comment
} yajl_lex_error;
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_lex_error yajl_lex_get_error(yajl_lexer lexer);
/** get the current offset into the most recently lexed json string. */
size_t yajl_lex_current_offset(yajl_lexer lexer);
/** get the number of lines lexed by this lexer instance */
size_t yajl_lex_current_line(yajl_lexer lexer);
/** get the number of chars lexed by this lexer instance since the last
* \n or \r */
size_t yajl_lex_current_char(yajl_lexer lexer);
/** get size of allocated buffer */
size_t yajl_lex_buf_capacity(yajl_lexer lexer);
#endif
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