[antlr-interest] RE: Is there a way to pass parameters to rules?
Ken Cecka
ceckak at alumni.washington.edu
Fri Dec 23 18:26:06 PST 2005
Perfect - thanks!
Scott Stanchfield wrote:
> 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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