32 lines
744 B
ANTLR
32 lines
744 B
ANTLR
// JSON, straight from the ANTLR book. Try it on a .json file:
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// antlrlab examples/json/JSON.g4 examples/json/example.json
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grammar JSON;
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json : value EOF ;
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obj : '{' pair (',' pair)* '}'
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| '{' '}'
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;
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pair : STRING ':' value ;
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arr : '[' value (',' value)* ']'
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| '[' ']'
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;
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value : STRING | NUMBER | obj | arr | 'true' | 'false' | 'null' ;
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STRING : '"' (ESC | SAFECODEPOINT)* '"' ;
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fragment ESC : '\\' (["\\/bfnrt] | UNICODE) ;
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fragment UNICODE : 'u' HEX HEX HEX HEX ;
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fragment HEX : [0-9a-fA-F] ;
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fragment SAFECODEPOINT : ~["\\\u0000-\u001F] ;
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NUMBER : '-'? INT ('.' [0-9]+)? EXP? ;
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fragment INT : '0' | [1-9] [0-9]* ;
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fragment EXP : [Ee] [+\-]? INT ;
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WS : [ \t\n\r]+ -> skip ;
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