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The JSON parser optionally supports interpolation. The lexer recognizes interpolation tokens unconditionally. The parser rejects them when interpolation is disabled, in parse_interpolation(). However, it neglects to set an error then, which can make json_parser_parse() fail without setting an error. Move the check for unwanted interpolation from the parser's parse_interpolation() into the lexer's finite state machine. When interpolation is disabled, '%' is now handled like any other unexpected character. The next commit will improve how such lexical errors are handled. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180823164025.12553-39-armbru@redhat.com>
49 lines
946 B
C
49 lines
946 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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typedef enum json_token_type {
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JSON_MIN = 100,
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JSON_LCURLY = JSON_MIN,
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JSON_RCURLY,
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JSON_LSQUARE,
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JSON_RSQUARE,
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JSON_COLON,
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JSON_COMMA,
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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_INTERP,
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JSON_SKIP,
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JSON_ERROR,
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} JSONTokenType;
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typedef struct JSONLexer {
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int start_state, state;
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GString *token;
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int x, y;
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} JSONLexer;
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void json_lexer_init(JSONLexer *lexer, bool enable_interpolation);
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void json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size);
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void json_lexer_flush(JSONLexer *lexer);
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void json_lexer_destroy(JSONLexer *lexer);
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#endif
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