Trace tokes and rules after parser ANTLR 4

Question

I would like to show all tokens and roles that was reached during the parser with Antlr 4, excluding all extra rules on the grammar.

    ANTLRInputStream input = new ANTLRInputStream(is);
    CerlLexer lexer = new CerlLexer(input);
    CommonTokenStream tokens = new CommonTokenStream(lexer);
    CerlParser parser = new CerlParser(tokens);
    ParseTree tree = parser.program();
    System.out.println(tree.toStringTree(parser));

Can I do that using Antlr 4 ?

Points on the tree that are not reached during the execution of some kind of little input. — fvarj, May 10 '16 at 19:10

score 2 · Answer 1 · edited Sep 22 '18 at 10:35

2

Set trace to true by calling parser method setTrace()

parser.setTrace(true);

It will not print the rules that are not reached.

edited Sep 22 '18 at 10:35

JamesThomasMoon

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answered May 31 '16 at 06:42

yoshi

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Trace tokes and rules after parser ANTLR 4

1 Answers1