[antlr-interest] Fundamental tree parsing question
Richard Clark
rdclark at gmail.com
Tue Jul 10 11:20:41 PDT 2007
On 7/10/07, Ted Villalba <ted.villalba at gmail.com> wrote:
> Hi,
>
> I'm stuck trying to figure out how to distinguish between multi-term values
> in a syntax tree.
> For instance, the following rule rewrites to a simple tree:
>
> field : tag '=' LPAREN value RPAREN -> ^('=' tag value)
Use subtrees:
tokens { TAG; VALUE; }
field : tag '=' LPAREN value RPAREN -> ^('=' tag value) ;
tag : ID -> ^(TAG ID) ;
value : NUMBER -> ^(VALUE NUMBER) ;
// end of the example
So something like :
TAG A=(THE TREE TEST)
Will give you:
(= (TAG A) (VALUE THE TREE TEST))
...Richard
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