qemu/json-lexer.h
Anthony Liguori 5ab8558d9b Add a lexer for JSON
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>
2009-11-17 08:49:39 -06:00

51 lines
977 B
C

/*
* JSON lexer
*
* Copyright IBM, Corp. 2009
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#ifndef QEMU_JSON_LEXER_H
#define QEMU_JSON_LEXER_H
#include "qstring.h"
#include "qlist.h"
typedef enum json_token_type {
JSON_OPERATOR = 100,
JSON_INTEGER,
JSON_FLOAT,
JSON_KEYWORD,
JSON_STRING,
JSON_ESCAPE,
JSON_SKIP,
} JSONTokenType;
typedef struct JSONLexer JSONLexer;
typedef void (JSONLexerEmitter)(JSONLexer *, QString *, JSONTokenType, int x, int y);
struct JSONLexer
{
JSONLexerEmitter *emit;
int state;
QString *token;
int x, y;
};
void json_lexer_init(JSONLexer *lexer, JSONLexerEmitter func);
int json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size);
int json_lexer_flush(JSONLexer *lexer);
void json_lexer_destroy(JSONLexer *lexer);
#endif