Let's say I've got a tree with a series of nested SPANs with TEXT leaves.
Let's say I want to write a tree grammar that causes SPANs with a
"boo" TEXT child to become a SPAN with a "moo" TEXT child.
rule: ^(SPAN 'boo') -> ^(SPAN 'moo')
That clearly doesn't work, because 'boo' and 'moo' aren't tokens.
So I did the following:
tree grammar Boo2Moo;
options {
ASTLabelType = CommonTree;
tokenVocab = IntermediateTree;
filter = true;
output = AST;
}
bottomup: spantag;
spantag: ^(parent=SPAN e=TEXT) {"boo".equals($e.getText())}?
{adaptor.setChild($parent, 0, adaptor.create(TEXT, "moo"));};
This works. Is there a more elegant way, or is this a reasonable approach?
Thanks,
-Adam
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