[antlr-interest] Is there a way to pass parameters to rules?
Scott Stanchfield
scott at javadude.com
Fri Dec 23 18:19:34 PST 2005
Sure:
targetRule [String foo, Person p]
: ...
;
callingRule
{ Person p = new Person(); }
: targetRule["blah blah", p]
;
-- Scott
> -----Original Message-----
> From: antlr-interest-bounces at antlr.org
> [mailto:antlr-interest-bounces at antlr.org] On Behalf Of Ken
> and Timi Cecka
> Sent: Friday, December 23, 2005 7:31 PM
> To: antlr-interest at antlr.org
> Subject: [antlr-interest] Is there a way to pass parameters to rules?
>
> Hi All,
>
> I know rules can return a value with the 'returns' keyword,
> but is there any way to pass a value to a rule when it's invoked?
>
> In developing my treeparser, I'm repeatedly finding that I
> want a rule to simply modify the object being constructed by
> the caller, and it's not always easy or convenient to
> construct a return type that temporarily encapsulates the
> results of the rule so that they can be passed up. It would
> be much simpler of the caller could pass a pointer down and
> allow the rule to modify the object directly.
>
> Ken
>
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