[antlr-interest] simple grammar question

Michael Roberts mike at 7f.com
Fri Mar 2 18:37:05 PST 2012

Hi folks.

I'm in the process of learning antlr (I just ordered Terrance's books), but
there something I am missing here.  The below compiles fine using
AntlrWorks, but when I feed it:


I get a a MissingTokenException (see attached bitmap), after it's matched
an identifier and a /.

grammar JLG2;

options {

@header {
package org.veve.reflect.interpreter.output;

@lexer::header {
package org.veve.reflect.interpreter.output;

compilationUnit : relativePath;

identifier : IdentifierStart IdentifierPart* ;
relativePath : identifier (SLASH identifier)* ;

SLASH : '/';

fragment IdentifierPart
    'a'..'z' | 'A'..'Z' | '_' | '0'..'9'

fragment IdentifierStart
    'a'..'z' | 'A'..'Z' | '_'

My expectation there was that identifier would match an alphanumeric
string, and that the rule for relativePath would let me string such
identifiers together with / in between.  However, I'm clearly missing
something obvious.  Thanks in advance.

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