[DGD] parse_string() example

[Erwin Harte]

This one I wrote in May '98, to parse config-files of something:

    parse_string("whitespace  = / +/\n" +
		 "string      = /\"[^\"]+\"/\n" +
		 "junk        = /./\n" +

		 "pattern     : sequence\n" +

		 "sequence    : options              ? pp_a\n" +
		 "sequence    : sequence options ? pp_b\n" +

		 "options     : element              ? pp_c\n" +
		 "options     : options '|' element  ? pp_d\n" +

		 "element     : string               ? pp_e\n" +
		 "element     : '(' pattern ')'      ? pp_f\n", line);

It would make an attempt at parsing lines containing stuff like this:

    "word0" (("word1" "word2") | "word3")

What the pp_[a-f] functions did I leave up to your own imagination.

Erwin.
-- 
Erwin Harte <harte at xs4all.nl>
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