[antlr-interest] DoubleLinkedTree

[Alexander Gängel]

Can anybody give me hint how to get DoublelinkTrees  to work?

Alexander Gängel schrieb:
> The exception comes when call the parser.Rule
>
> 19        CharStream input = new ANTLRFileStream(args[0]);
> 20        oclLexer lex = new oclLexer(input);
> 21        CommonTokenStream tokens = new CommonTokenStream(lex);
> 22
> 23        oclParser parser = new oclParser(tokens);
> 24        oclParser.start_return r = parser.start();
>
>
> Exception in thread "main" java.lang.ClassCastException:
> org.antlr.runtime.tree.CommonTree
>     at ocl_parser.oclParser.ocl(oclParser.java:186)
>     at ocl_parser.oclParser.start(oclParser.java:122)
>     at tests.ImBaumsuchen.main(ImBaumsuchen.java:24)
>
> (oclParser.java:122)
> 117        try {
> 118            // src/ocl_parser/ocl.g:102:9: ( ocl -> ^( OCL ocl ) )
> 119            // src/ocl_parser/ocl.g:102:9: ocl
> 120            {
> 121            pushFollow(FOLLOW_ocl_in_start193);
> 122            ocl1=ocl();
> 123            _fsp--;
> 124            if (failed) return retval;
> 125            if ( backtracking==0 ) list_ocl.add(ocl1.getTree());
>
> (oclParser.java:186)
> 182        try {
> 183            // src/ocl_parser/ocl.g:105:2: ( ( package_decl | context
> )+ )
> 184            // src/ocl_parser/ocl.g:105:2: ( package_decl | context )+
> 185            {
> 186            root_0 = (OclAst)adaptor.nil();
> 187
> 188            // src/ocl_parser/ocl.g:105:2: ( package_decl | context )+
> 189            int cnt1=0;
> 190            loop1:
> 191            do {
>
> I tried to make myAst extend DoublelinkTree or Commontree both with same
> effect
>
> when I use Commontree in my Grammar everything works fine.
>
> Alexander
>
> Terence Parr schrieb:
>   
>> Where does it get the exception?  Is it for the UP and DOWN nodes?
>> Ter
>> On Feb 20, 2007, at 2:50 AM, Alexander Gängel wrote:
>>
>>     
>>> Can Somebody give me a hint how to use DoubleLinkTrees.
>>>
>>> I tried it this way:
>>>
>>> I have
>>> ASTLabelType=MyAst; in my V3 Grammar
>>>
>>> I created a Class MyAst extends DoubleLinkTree
>>>
>>> I Implemented the Abstract functions from BaseTree like in CommonTree
>>>
>>> but when I try to use the Grammar I get Exception in thread "main"
>>> java.lang.ClassCastException: org.antlr.runtime.tree.CommonTree
>>>
>>> Alexander
>>>
>>>       

-- 
Alexander Gängel
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