segment matching variables in Qi-YACC (for Snorgers ;)) - Qilang

Message from discussion segment matching variables in Qi-YACC (for Snorgers ;))

Mark Tarver

More options 26 June, 10:37

From: Mark Tarver <dr.mtar...@ukonline.co.uk>

Date: Fri, 26 Jun 2009 02:37:13 -0700 (PDT)

Local: Fri 26 June 2009 10:37

Subject: segment matching variables in Qi-YACC (for Snorgers ;))

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Here is a sugaring on top of Qi that enables you to have segment
matching variables in Qi-YACC. <<...>> is a stuff matcher.

(defcc <grab-numbers>
<<X>> <numbers> <<Y>> := <numbers>;)

(defcc <numbers>
<number> <numbers>;
<number>;)

(defcc <number>
-*- := (if (number? -*-) [-*-] #\Escape);)

(defcc <grab-my-name>
<<X>> :name <<Y>> := <<Y>>;)

Examples:

(compile <grab-my-name> [ghhghg 7 8 :name Mark Tarver])
[Mark Tarver]

(compile <grab-numbers> [just some numbers 1 2 3/4 tum te tum])
[1 2 3/4]

The code is 85 lines.

Mark

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