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Code Block

title	Main entry point for Java

@members {
    public static void main(String[] args) throws Exception {
        SimpleCalcLexer lex = new SimpleCalcLexer(new ANTLRFileStream(args[0]));
       	CommonTokenStream tokens = new CommonTokenStream(lex);

        SimpleCalcSimpleCalcParser parser = new SimpleCalcSimpleCalcParser(tokens);

        try {
            parser.expr();
        } catch (RecognitionException e)  {
            e.printStackTrace();
        }
    }
}

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Construct	Description	Example
`(...)*`	Kleene closure - matches zero or more occurrences	`LETTER DIGIT*` - match a `LETTER` followed by zero or more occurrences of `DIGIT`
`(...)+`	Positive Kleene closure - matches one or more occurrences	`('0'..'9')+` - match one or more occurrences of a numerical digit `LETTER (LETTER\|DIGIT)+` - match a `LETTER` followed one or more occurrences of either `LETTER` or `DIGIT`
`fragment`	`fragment` in front of a lexer rule instructs ANTLR that the rule is only used as part of another lexer rule (i.e. it only builds a fragment of a recognized token)	`fragment` {{ DIGIT : '0'..'9' ; NUMBER : (DIGIT)+ ('.' (DIGIT)+ )? ;}}

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