[antlr-interest] Error in CodeGenTreeWalker
Jose San Leandro
jose.sanleandro at ventura24.es
Thu Dec 14 12:01:51 PST 2006
Hi,
I'm working on a grammar which filters an input with lexical filters and
modifies some stuff.
I've declared a lexer rule like this:
fragment
ANYTHING_BUT_BRACKET
: c=~('{'|'}') {append((char) c);}
;
When executing ANTLR, it fails with the following message:
error(100): AntLangInner.g:0:0: syntax error: codegen: <AST>:0:0: unexpected
end of subtree
error(10): internal error: AntLangInner.g : java.lang.ClassCastException
org.antlr.codegen.CodeGenTreeWalker.alternative(CodeGenTreeWalker.java:1135)
org.antlr.codegen.CodeGenTreeWalker.block(CodeGenTreeWalker.java:1000)
org.antlr.codegen.CodeGenTreeWalker.ebnf(CodeGenTreeWalker.java:2397)
org.antlr.codegen.CodeGenTreeWalker.element(CodeGenTreeWalker.java:1856)
I don't know if that is expected or not. What the rule tries to do is to match
and leave untouched anything but opening or closing brackets. Is there a
better way to do it?
Thank you in advance,
Jose.
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