[antlr-interest] Recognizing interesting productions amidst o ther text

[mzukowski at yci.com]

Look at the article on antlr.org titled something like "ANTLR meets SED"

Monty

-----Original Message-----
From: semiclueful [mailto:semiclueful at yahoo.com] 
Sent: Wednesday, February 11, 2004 4:47 PM
To: antlr-interest at yahoogroups.com
Subject: [antlr-interest] Recognizing interesting productions amidst other
text

Hello ANTLR savants,
    I have a corpus that consists of natural language text
interspersed with occasional strings representing times (e.g. "12:01
pm", "noon", "1 am") for which I have already built a working grammar
and parser.  *I'm not interested in parsing the natural language text*
-- I just want to capture whatever text appears between "time"
instances.
    I'd like to figure out a way to get Antlr to consider the text
("phrase") as this *very* loose pseudo-grammar:

phrase:
    (time (description)?)+;

time:
    numericTime | MIDNIGHT | NOON | other_cases_i'm_leaving_out;

description:
    nontime;

As I said, the "time"-related productions, which I've elided, do work,
and I'm hoping I can just drop them into this grammar as-is.  However,
I'm unable to come up with a workable definition of "description" or
"nontime" that works with them and doesn't create a mess of lexical
nondeterminism.  The ultimate goal is to apply it to a piece of text
like

"8:00 am Woke up, got out of bed.  9am Ran a comb across my head."

and have it produce time/text pairs like

[8:00, "Woke up, got out of bed.  "], [9:00, "Ran a comb across my
head."]

But recognizing the non-time text is beyond my laughable Antlr
(in)abilities.  I'm guessing that lexical predicates might provide a
way to do this, but I'd appreciate any and all tips you can offer.

Thanks!




 
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