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118 lines
4.1 KiB
C
118 lines
4.1 KiB
C
/*
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* Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef __YAJL_LEX_H__
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#define __YAJL_LEX_H__
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#include "api/yajl_common.h"
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typedef enum {
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yajl_tok_bool,
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yajl_tok_colon,
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yajl_tok_comma,
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yajl_tok_eof,
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yajl_tok_error,
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yajl_tok_left_brace,
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yajl_tok_left_bracket,
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yajl_tok_null,
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yajl_tok_right_brace,
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yajl_tok_right_bracket,
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/* we differentiate between integers and doubles to allow the
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* parser to interpret the number without re-scanning */
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yajl_tok_integer,
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yajl_tok_double,
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/* we differentiate between strings which require further processing,
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* and strings that do not */
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yajl_tok_string,
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yajl_tok_string_with_escapes,
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/* comment tokens are not currently returned to the parser, ever */
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yajl_tok_comment
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} yajl_tok;
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typedef struct yajl_lexer_t * yajl_lexer;
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yajl_lexer yajl_lex_alloc(yajl_alloc_funcs * alloc,
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unsigned int allowComments,
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unsigned int validateUTF8);
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void yajl_lex_free(yajl_lexer lexer);
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/**
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* run/continue a lex. "offset" is an input/output parameter.
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* It should be initialized to zero for a
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* new chunk of target text, and upon subsetquent calls with the same
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* target text should passed with the value of the previous invocation.
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*
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* the client may be interested in the value of offset when an error is
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* returned from the lexer. This allows the client to render useful
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* error messages.
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*
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* When you pass the next chunk of data, context should be reinitialized
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* to zero.
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*
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* Finally, the output buffer is usually just a pointer into the jsonText,
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* however in cases where the entity being lexed spans multiple chunks,
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* the lexer will buffer the entity and the data returned will be
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* a pointer into that buffer.
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*
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* This behavior is abstracted from client code except for the performance
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* implications which require that the client choose a reasonable chunk
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* size to get adequate performance.
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*/
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yajl_tok yajl_lex_lex(yajl_lexer lexer, const unsigned char * jsonText,
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size_t jsonTextLen, size_t * offset,
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const unsigned char ** outBuf, size_t * outLen);
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/** have a peek at the next token, but don't move the lexer forward */
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yajl_tok yajl_lex_peek(yajl_lexer lexer, const unsigned char * jsonText,
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size_t jsonTextLen, size_t offset);
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typedef enum {
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yajl_lex_e_ok = 0,
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yajl_lex_string_invalid_utf8,
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yajl_lex_string_invalid_escaped_char,
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yajl_lex_string_invalid_json_char,
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yajl_lex_string_invalid_hex_char,
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yajl_lex_invalid_char,
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yajl_lex_invalid_string,
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yajl_lex_missing_integer_after_decimal,
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yajl_lex_missing_integer_after_exponent,
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yajl_lex_missing_integer_after_minus,
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yajl_lex_unallowed_comment
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} yajl_lex_error;
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const char * yajl_lex_error_to_string(yajl_lex_error error);
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/** allows access to more specific information about the lexical
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* error when yajl_lex_lex returns yajl_tok_error. */
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yajl_lex_error yajl_lex_get_error(yajl_lexer lexer);
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/** get the current offset into the most recently lexed json string. */
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size_t yajl_lex_current_offset(yajl_lexer lexer);
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/** get the number of lines lexed by this lexer instance */
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size_t yajl_lex_current_line(yajl_lexer lexer);
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/** get the number of chars lexed by this lexer instance since the last
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* \n or \r */
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size_t yajl_lex_current_char(yajl_lexer lexer);
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#endif
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