Initial commit of JSON grammar.

Author: rainerschuster

json/Json.g4

@@ -0,0 +1,118 @@
+/*
+BSD License
+
+Copyright (c) 2013, Rainer Schuster
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of Rainer Schuster nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+JSON grammar derived from:
+
+    http://tools.ietf.org/html/rfc4627
+
+    The application/json Media Type for JavaScript Object Notation (JSON)
+    July 2006
+
+Terminal rules mainly created by ANTLRWorks 1.5 sample code.
+ */
+grammar Json;
+
+jsonText
+	: jsonObject
+	| jsonArray
+;
+
+jsonValue
+	: 'false'
+	| 'null'
+	| 'true'
+	| jsonObject
+	| jsonArray
+	| jsonNumber
+	| jsonString
+;
+
+jsonNumber
+	: NUMBER
+;
+
+jsonString
+	: STRING
+;
+
+jsonObject
+	: '{' (member (',' member)*)? '}'
+;
+
+member
+	: STRING ':' jsonValue
+;
+
+jsonArray
+	: '[' (jsonValue (',' jsonValue)*)? ']'
+;
+
+fragment
+INT
+	: '0'..'9'+
+;
+
+NUMBER
+	: '-'? ('0' | ( '1'..'9' INT* )) ('.' INT+)? EXPONENT?
+;
+
+WS
+	: ( ' '
+	| '\t'
+	| '\n'
+	| '\r'
+	) -> channel(HIDDEN)
+;
+
+STRING
+	: '"' ( ESC_SEQ | ~('\\'|'"') )* '"'
+;
+
+fragment
+EXPONENT
+	: ('e'|'E') ('+'|'-')? ('0'..'9')+
+;
+
+fragment
+HEX_DIGIT
+	: ('0'..'9'|'a'..'f'|'A'..'F')
+;
+
+fragment
+ESC_SEQ
+	: '\\' ('\"'|'\\'|'/'|'b'|'f'|'n'|'r'|'t')
+	| UNICODE_ESC
+;
+
+fragment
+UNICODE_ESC
+	: '\\' 'u' HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT
+;