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/** An adaptor that tells ANTLR to build CymbalAST nodes */
public static TreeAdaptor cymbalAdaptor = new CommonTreeAdaptor() {
public Object create(Token token) {
return new CymbalAST(token);
}
public Object dupNode(Object t) {
if ( t==null ) {
return null;
}
return create(((CymbalAST)t).token);
}
public Object errorNode(TokenStream input, Token start, Token stop,
RecognitionException e)
{
CymbalErrorNode t = new CymbalErrorNode(input, start, stop, e);
return t;
}
};
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Here's a suitable error node:
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/** A node representing erroneous token range in token stream */
public class CymbolErrorNode extends CymbolAST {
org.antlr.runtime.tree.CommonErrorNode delegate;
public CymbolErrorNode(TokenStream input, Token start, Token stop,
RecognitionException e)
{
delegate = new CommonErrorNode(input,start,stop,e);
}
public boolean isNil() { return delegate.isNil(); }
public int getType() { return delegate.getType(); }
public String getText() { return delegate.getText(); }
public String toString() { return delegate.toString(); }
}
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Error Node Insertion Upon Syntax Error
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