[antlr-interest] java.lang.ArrayIndexOutOfBoundsException: 0

[Diane Nkonyereza]

I got this while testing my grammar. The grammar is an alteration of the java grammar.
Could anyone please help me to understand what's happening.



Exception in thread 'main' java.lang.ArrayIndexOutOfBoundsException: 0
        at org.antlr.runtime.DFA.predict(DFA.java:59)
        at JackXMLLexer.mTokens(JackXMLLexer.java:3911)
        at org.antlr.runtime.Lexer.nextToken(Lexer.java:109)
        at org.antlr.runtime.CommonTokenStream.fillBuffer(CommonTokenStream.java
:95)
        at org.antlr.runtime.CommonTokenStream.LT(CommonTokenStream.java:238)
        at org.antlr.runtime.debug.DebugTokenStream.<init>(DebugTokenStream.java
:45)
        at org.antlr.runtime.debug.DebugParser.<init>(DebugParser.java:56)
        at classes.classesRules.JackXMLParser.<init>(JackXMLParser.java:103)
        at classes.classesRules.JackXMLParser.<init>(JackXMLParser.java:115)
        at TestJackXML.main(TestJackXML.java:9)

The  lines in the parser (103 - 105) are:

 switch (alt2) {
                case 1 :
                    // JackXML.g:0:0: importDeclaration
                    {
                    pushFollow(FOLLOW_importDeclaration_in_compilationUnit74);
                    importDeclaration();
                    _fsp--;
                    if (failed) return ;

                    }
                    break;

                default :
                    break loop2;
                }

If it helps to understand the error by looking at the whole grammar, please let me know.

Cheers,
D.

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