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PATH: usr / share / doc / perl-Parse-RecDescent-1.967009 / demo

#!/usr/bin/perl -sw

# WHO'S ON FIRST?

use vars qw( @base @man @attempt );   # This is a comment

use Parse::RecDescent;

sub Parse::RecDescent::choose { $_[int rand @_]; }

$abbott = new Parse::RecDescent <<'EOABBOTT';

Interpretation:
		ConfirmationRequest
	      | NameRequest
	      | BaseRequest

ConfirmationRequest:
	       	Preface(s?) Name /[i']s on/ Base
			{ (lc $::man{$item[4]} eq lc $item[2])
				? "Yes"
				: "No, $::man{$item[4]}\'s on $item[4]"
			}

| Preface(s?) Name /[i']s the (name of the)?/ Man /('s name )?on/ Base
			{ (lc $::man{$item[6]} eq lc $item[2])
				? "Certainly"
				: "No. \u$item[2] is on " . $::base{lc $item[2]}
			}

BaseRequest:
	        Preface(s?) Name /(is)?/
			{ "He's on " . $::base{lc $item[2]} }

NameRequest:
	        /(What's the name of )?the/i Base "baseman"
			{ $::man{$item[2]} }

Preface: ...!Name /\S*/

Name:	/Who/i  | /What/i  | /I Don't Know/i

Base:	'first' | 'second' | 'third'

Man:	'man'   | 'guy'    | 'fellow'
EOABBOTT

$costello = new Parse::RecDescent <<'EOCOSTELLO';

Interpretation:
		Meaning <reject:$item[1] eq $thisparser->{prev}>
			{ $thisparser->{prev} = $item[1] }
	      | { choose(@::attempt) }

Meaning:
		Question
	      | UnclearReferent
	      | NonSequitur
	      | { choose(@::attempt) }

Question:
	        Preface Interrogative /[i']s on/ Base
	      		{ choose ("Yes, what is the name of the guy on $item[4]?",
				  "The $item[4] baseman?",
				  "I'm asking you! $item[2]?",
				  "I don't know!")			}

| Interrogative
	      		{ choose ("That's right, $item[1]?",
				  "What?",
				  "I don't know!")			}

UnclearReferent:
	        "He's on" Base
	      		{ choose ("Who's on $item[2]?",
				  "Who is?",
				  "So, what is the name of the guy on $item[2]?"
				  )					}

NonSequitur:
		( "Yes" | 'Certainly' | /that's correct/i )
			{ choose("$item[1], who?",
				 "What?",
				 @::attempt)				}

Interrogative: /who/i | /what/i

Base:	'first' | 'second' | 'third'

Preface: ...!Interrogative /\S*/

EOCOSTELLO

%man = ( first => "Who", second => "What", third => "I Don't Know" );
%base  = map { lc } reverse %man;

@attempt =
(
	"So, who's on first?",
	"I want to know who's on first?",
	"What's the name of the first baseman?",
	"Let's start again. What's the name of the guy on first?",
	"Okay, then, who's on second?",
	"Well then, who's on third?",
	"What's the name of the fellow on third?",
);

$costello->{prev} = $line = "Who's on first?";

while (1)
{
	print "<costello>  ", $line, "\n";
	$line = $abbott->Interpretation($line);
	sleep 1;
	print "<abbott>    ", $line, "\n";
	$line = $costello->Interpretation($line);
	sleep 1;
}

[-] demo_cpp.pl [edit]
[-] demo_autorule.pl [edit]
[-] demo_errors.pl [edit]
[-] demo_piecewise.pl [edit]
[-] demo_logic.pl [edit]
[-] demo_skipcomment.pl [edit]
[-] demo_implicit.pl [edit]
[-] demo_separators.pl [edit]
[-] demo_perlparsing.pl [edit]
[-] demo_street.pl [edit]
[-] demo_scoredsep.pl [edit]
[-] demo.c [edit]
[-] demo_textgen.pl [edit]
[-] demo.pl [edit]
[-] demo_calc.pl [edit]
[+] ..
[-] demo_another_Cgrammar.pl [edit]
[-] demo_matchrule2.pl [edit]
[-] demo_mccoy.pl [edit]
[-] demo_restructure_painful.pl [edit]
[-] demo_methods.pl [edit]
[-] demo_language.pl [edit]
[-] demo_selfmod.pl [edit]
[-] demo_OOautoparsetree.pl [edit]
[-] demo_codeblock.pl [edit]
[-] demo_simplequery.pl [edit]
[-] demo_restructure_easy.pl [edit]
[-] demo_tokens.pl [edit]
[-] demo_decomment.pl [edit]
[-] demo_recipe.pl [edit]
[-] demo_delete.pl [edit]
[-] demo_lisplike.pl [edit]
[-] demo_bad.pl [edit]
[-] demo_arithmetic.pl [edit]
[-] demo_leftassoc.pl [edit]
[-] demo_PerlCSV.pl [edit]
[-] demo_metaRD.pm [edit]
[-] demo_derived.pl [edit]
[-] demo_opreps.pl [edit]
[-] demo_matchrule.pl [edit]
[-] demo_LaTeXish_autoact.pl [edit]
[-] demo_operator.pl [edit]
[-] demo_autoscoresep.pl [edit]
[-] demo_Cgrammar_v2.pl [edit]
[-] demo_NL2SQL.pl [edit]
[-] demo_Cgrammar.pl [edit]
[-] demo_randomsentence.pl [edit]
[-] demo_template.pl [edit]
[-] demo_quicklist.pl [edit]
[-] demo_itemhash.pl [edit]
[-] demo_buildcalc.pl [edit]
[-] demo_leftop.pl [edit]
[-] demo_decomment_nonlocal.pl [edit]
[-] demo_dot.pl [edit]
[-] demo_LaTeXish.pl [edit]
[-] demo_precalc.pl [edit]
[-] demo_eval.pl [edit]
[-] demo_autostub.pl [edit]
[-] demo_whoson.pl [edit]
[-] demo_lexer.pl [edit]
[-] demo_OOparsetree.pl [edit]
[-] demo_parsetree.pl [edit]
[-] demo_simple.pl [edit]
[-] demo_embedding.pl [edit]
[-] demo_simpleXML.pl [edit]
[-] demo_undumper.pl [edit]