Thanks Jim,
I looked at " XMLParser.g:29:11" before doing the first post. That pointed me
to "returns" in this rule. My only idea is that there is something I need to do
at the top of the grammar definition, like set output to AST. Before using
"returns". At that point I started to "backtrack" and looked at the rest of the
stack.
I am still stuck.
attribute returns [string cl] : GENERIC_ID ATTR_EQ ATTR_VALUE
> From: [email protected]
> Date: Wed, 8 Jun 2011 09:01:44 -0700
> To: [email protected]
> Subject: Re: [antlr-interest] Something in my little grammar throws an Unable
> to cast CommonTree to type GrammarAST
>
> You are looking too far down the error message list. Fix the error at:
>
>
> > error(100): XMLParser.g:29:11: syntax error: antlr:
>
>
> First.
>
> Jim
>
> > -----Original Message-----
> > From: [email protected] [mailto:antlr-interest-
> > [email protected]] On Behalf Of Arturo Hernandez
> > Sent: Wednesday, June 08, 2011 7:21 AM
> > To: AN TLR
> > Subject: [antlr-interest] Something in my little grammar throws an
> > Unable to cast CommonTree to type GrammarAST
> >
> >
> > This is a modified version of the xml example from the ANTLR website.
> > Eventually I want to extract data from XHTML.
> > I probably just need a second to spot a simple mistake. I have the
> > reference book, not finished it yet, but did spend plenty of time on
> > this and I am stuck.
> > error(100): XMLParser.g:29:11: syntax error: antlr:
> > NoViableAltException(72@[475:4: ( ( id ( ASSIGN | PLUS_ASSIGN ) ( atom
> > | block ) ) (sub= ebnfSuffix[root_0,false] )? |a= atom (sub2=
> > ebnfSuffix[$a.tree,false] )? | ebnf | FORCED_ACTION | ACTION |p=
> > SEMPRED ( IMPLIES )? |t3= tree_ )])error(100): XMLParser.g:29:11:
> > syntax error: antlr: NoViableAltException(72@[475:4: ( ( id ( ASSIGN |
> > PLUS_ASSIGN ) ( atom | block ) ) (sub= ebnfSuffix[root_0,false] )? |a=
> > atom (sub2= ebnfSuffix[$a.tree,false] )? | ebnf | FORCED_ACTION |
> > ACTION |p= SEMPRED ( IMPLIES )? |t3= tree_ )])error(100):
> > XMLParser.g:0:1: syntax error: assign.types:
> > MismatchedTreeNodeException(0!=32)error(100): XMLParser.g:0:1: syntax
> > error: assign.types: MismatchedTreeNodeException(3!=33)error(100):
> > XMLParser.g:0:1: syntax error: assign.types:
> > MismatchedTreeNodeException(3!=34)error(10): internal error:
> > XMLParser.g : System.InvalidCastException: Unable to cast object of
> > type 'Antlr.Runtime.Tree.CommonTree' to type 'Antlr
> > 3.Tool.GrammarAST'.
> >
> >
> > parser grammar XMLParser;options{ language=CSharp3;
> > tokenVocab=XMLLexer;}
> > @header {using System;}@namespace { XMLParserN } document : element ;
> > element : startTag (element | PCDATA )*
> > endTag | emptyElement ;
> > startTag : TAG_START_OPEN GENERIC_ID {Console.Write(@"<" +
> > $GENERIC_ID.text); } (attribute {if $attribute.cl!=@"" then
> > Console.Write(@" class=\"" + $attribute.cl + @"\"");} )*
> > TAG_CLOSE {Console.Write(@">" + $GENERIC_ID.text); }
> > attribute returns [string cl] : GENERIC_ID ATTR_EQ ATTR_VALUE
> > { if ($GENERIC_ID.text==@"class") $cl = $ATTR_VALUE.text else $cl
> > = @""; } ;
> > endTag : TAG_END_OPEN GENERIC_ID TAG_CLOSE
> {Console.Write(@"</" +
> > $GENERIC_ID.text + @">"); };
> > emptyElement : TAG_START_OPEN GENERIC_ID (attribute)* TAG_EMPTY_CLOSE
> > ;
> >
> > List: http://www.antlr.org/mailman/listinfo/antlr-interest
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