[antlr-interest] DoubleLinkedTree

[Alexander Gängel]

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
>>
>