[REBOL] Re: How to Parse a Nested Block
From: ryanc:iesco-dms at: 17-Sep-2001 15:53
The problem is that there is no recursiveness to your rule, so it is
only capable of parsing one block depth. The block, {[text[string!]
size[integer!]]}, is two deep. By ignoring any depth, should return
that value {[text[string!} since the second #"[" is blindly copied
with the 'copy 'to.
Some advice... Since your parsing rebol formatted words, load and
parse them. something like this should then work:
rule: [
any [ string! copy str (print ["purpose:" str])]
some [
word! copy wrd (print ["parameter:" wrd]) |
block! copy blk (print ["types:" blk]) |
string! copy str (print ["description:" str]) |
refinement! copy ref (print ["refinement:" ref])
]
]
--Ryan
Tim Johnson wrote:
> I swear I'm as dumb as stump when it comes to parsing: but
> I've got "problem" whose "solution" should enlighten me immensely.
> Here 'tis:
> I want to parse rebol code so that I "extract" the interface block
> from a function.
> The following script "isolates" the code in a block, but not if
> there are inner blocks:
> rule: [thru "[" copy block-contents to "]" (print block-contents)]
> parse/all {["This is a block"]} rule
> ; returns:
> "This is a block" ; okay, that's what I want. Cool!
> parse/all {[text[string!] size[integer!]]} rule
> ; returns only
> [text[string! ; bummer, not what I wanted
> ; I wanted to see: text[string!] size[integer!]
> ; in other words parsed to the matching closing bracket
> ; What else to I need to do?
> TIA
> Tim
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--
Ryan Cole
Programmer Analyst
www.iesco-dms.com
707-468-5400
