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[REBOL] Re: reusing parse rules

From: david::vydra::net at: 23-Jan-2001 23:41

Andrew: I've been playing :) r1: [r1: [any r2]] r2: [r2: [word!]] my-parser: make object! compose [ (r1) (r2) ;-- you can even attach an action to an existing rule ([append r2 [( print "Found Word")]]) ] regards david
Hi, David (and feedback), you wrote (directly:
> Have you found a satisfactory solution to reusing grammar rules?
Not yet. My best so far is to put common rules in an object like: Rules: make object! [ Label: [Alpha some Alphanumeric] ] then refer to the rule in another object like: Parser: make object! [ Label: Rules/Label Action: [ Label ( ; Do stuff here ) ] ] My next thoughts are to request object/path support in 'parse rules from Rebol HQ. Something like: Action: [ Rules/Label ( ; My action here. ) ] would be good to add to Rebol's 'parse dialect.