I have a grammar in which i wish to create an imaginary AST node, and then have
an action treat that node. The most straightforward expression i have devised
is:
grammar Empty;
options {output=AST;}
tokens {Imaginary;}
@members {void treat(Object t){}}
parse: empty EOF! {treat($empty.tree);};
empty: ->^(Imaginary);
However, the generated EmptyParser.java fails to compile because empty()
catches RecognitionException, which is never thrown.
I am working around this by:
empty: ->^(Imaginary)|Imaginary;
which works because the imaginary token can never be produced by the lexer.
Is there some other way i should be going about this?
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Trevor John Thompson (425) 246-4023
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