d7ff3acbb4
The second stage of our JSON parser is a simple state machine that identifies individual JSON values by counting the levels of nesting of tokens. It does not perform grammar validation. We use this to emit a full JSON value to the parser. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
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* JSON streaming support
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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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#include "qlist.h"
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#include "qint.h"
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#include "qdict.h"
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#include "qemu-common.h"
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#include "json-lexer.h"
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#include "json-streamer.h"
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static void json_message_process_token(JSONLexer *lexer, QString *token, JSONTokenType type, int x, int y)
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{
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JSONMessageParser *parser = container_of(lexer, JSONMessageParser, lexer);
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QDict *dict;
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if (type == JSON_OPERATOR) {
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switch (qstring_get_str(token)[0]) {
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case '{':
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parser->brace_count++;
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break;
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case '}':
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parser->brace_count--;
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break;
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case '[':
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parser->bracket_count++;
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break;
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case ']':
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parser->bracket_count--;
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break;
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default:
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break;
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}
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}
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dict = qdict_new();
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qdict_put_obj(dict, "type", QOBJECT(qint_from_int(type)));
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QINCREF(token);
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qdict_put_obj(dict, "token", QOBJECT(token));
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qdict_put_obj(dict, "x", QOBJECT(qint_from_int(x)));
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qdict_put_obj(dict, "y", QOBJECT(qint_from_int(y)));
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qlist_append(parser->tokens, dict);
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if (parser->brace_count == 0 &&
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parser->bracket_count == 0) {
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parser->emit(parser, parser->tokens);
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QDECREF(parser->tokens);
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parser->tokens = qlist_new();
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}
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}
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void json_message_parser_init(JSONMessageParser *parser,
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void (*func)(JSONMessageParser *, QList *))
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{
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parser->emit = func;
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parser->brace_count = 0;
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parser->bracket_count = 0;
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parser->tokens = qlist_new();
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json_lexer_init(&parser->lexer, json_message_process_token);
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}
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int json_message_parser_feed(JSONMessageParser *parser,
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const char *buffer, size_t size)
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{
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return json_lexer_feed(&parser->lexer, buffer, size);
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}
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int json_message_parser_flush(JSONMessageParser *parser)
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{
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return json_lexer_flush(&parser->lexer);
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}
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void json_message_parser_destroy(JSONMessageParser *parser)
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{
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json_lexer_destroy(&parser->lexer);
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QDECREF(parser->tokens);
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}
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