ANTLR is an open source grammar language created in 1992 by Terence Parr.
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In computer-based language recognition, ANTLR (pronounced Antler), or Another Tool For Language Recognition, is a parser generator that uses LL(*) for parsing. ANTLR is the successor to the Purdue Compiler Construction Tool Set (PCCTS), first developed in 1989, and is under active development. Its maintainer is Professor Terence Parr of the University of San Francisco.. Read more on Wikipedia...
/** Taken from "The Definitive ANTLR 4 Reference" by Terence Parr */
// Derived from http://json.org
grammar JSON;
json
: value
;
obj
: '{' pair (',' pair)* '}'
| '{' '}'
;
pair
: STRING ':' value
;
arr
: '[' value (',' value)* ']'
| '[' ']'
;
value
: STRING
| NUMBER
| obj
| arr
| 'true'
| 'false'
| 'null'
;
STRING
: '"' (ESC | SAFECODEPOINT)* '"'
;
fragment ESC
: '\\' (["\\/bfnrt] | UNICODE)
;
fragment UNICODE
: 'u' HEX HEX HEX HEX
;
fragment HEX
: [0-9a-fA-F]
;
fragment SAFECODEPOINT
: ~ ["\\\u0000-\u001F]
;
NUMBER
: '-'? INT ('.' [0-9] +)? EXP?
;
fragment INT
: '0' | [1-9] [0-9]*
;
// no leading zeros
fragment EXP
: [Ee] [+\-]? INT
;
// \- since - means "range" inside [...]
WS
: [ \t\n\r] + -> skip
;
TextReader reader;
// (...) Fill TextReader with character
SumLexer lexer = new SumLexer(reader);
SumParser parser = new SumParser(lexer);
parser.expression();
Feature | Supported | Example | Token |
---|---|---|---|
Booleans | ✓ | true false | |
MultiLine Comments | ✓ | /* A comment */ | /* */ |
Comments | ✓ | // A comment | |
Line Comments | ✓ | // A comment | // |
Semantic Indentation | X |