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Our JSON parser is a three stage parser. The first stage tokenizes the stream into a set of lexical tokens. Since the lexical grammar is regular, we can use a finite state machine to model it. The state machine will emit tokens as they are identified. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
50 lines
977 B
C
50 lines
977 B
C
/*
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* JSON lexer
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*
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* Copyright IBM, Corp. 2009
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#ifndef QEMU_JSON_LEXER_H
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#define QEMU_JSON_LEXER_H
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#include "qstring.h"
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#include "qlist.h"
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typedef enum json_token_type {
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JSON_OPERATOR = 100,
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JSON_INTEGER,
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JSON_FLOAT,
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JSON_KEYWORD,
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JSON_STRING,
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JSON_ESCAPE,
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JSON_SKIP,
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} JSONTokenType;
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typedef struct JSONLexer JSONLexer;
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typedef void (JSONLexerEmitter)(JSONLexer *, QString *, JSONTokenType, int x, int y);
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struct JSONLexer
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{
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JSONLexerEmitter *emit;
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int state;
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QString *token;
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int x, y;
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};
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void json_lexer_init(JSONLexer *lexer, JSONLexerEmitter func);
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int json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size);
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int json_lexer_flush(JSONLexer *lexer);
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void json_lexer_destroy(JSONLexer *lexer);
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#endif
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