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

#!/usr/bin/perl -sw

# "Potato, Egg, Red meat & Lard Cookbook",
# T. Omnicient Rash & N. Hot Ignorant-Kant
# O'Besity & Associates

use Parse::RecDescent;

$grammar =
q{
	Recipe: Step(s)

Step:
		Verb Object Clause(s?)
			{ print "$item[1]\n" }
	      | <resync:[ ]{2}>

Verb:
		'boil'
	      | 'peel'
	      | 'mix'
	      | 'melt'
	      | 'fry'
	      | 'steam'
	      | 'marinate'
	      | 'sprinkle'
	      | 'is'
	      | 'are'
	      | 'has'

Object:
		IngredientQualifier(s) Ingredient
	      | ReferenceQualifier(s) Ingredient
	      | Reference

Clause:
	        SubordinateClause
              | CoordinateClause

SubordinateClause:
		'until' State
	      | 'while' State
	      | 'for' Time

CoordinateClause:
		/and( then)?/ Step
	      | /or/ Step

State:
		Object Verb Adjective
	      | Adjective

Time:
		Number TimeUnit

TimeUnit:
		/hours?/
		/minutes?/
		/seconds?/

QuantityUnit:
		/lbs?/

Object:
		ReferenceQualifier Ingredient
	      | Reference

Reference:
		'they'
	      | 'it'
	      | 'them'

Amount: Number QuantityUnit

ReferenceQualifier:
	        'the'
	      | 'those'
	      | 'each'
	      | 'half the'

Adjective:
		'soft'
	      | 'tender'
	      | 'done'
	      | 'charred'
	      | 'grey'

};

$parse = new Parse::RecDescent ($grammar);

$/ = "\n\n";
while (<DATA>)
{
	if($ingredients = $parse->Recipe(lc $_))
	{
		print "$ingredients\n$_";
	}
}

__DATA__
Boil six large potatoes until they are grey and then marinate them
for at least two hours in a mixture of lard, olive oil, raw
sugar, and sea-salt.  In a deep-fryer melt 2 lbs of bacon fat and
bring to the boil.  Fry the marinated potatoes for 7 minutes, or
until they are nicely charred.  Serve with lashings of butter.
Sprinkle with salt and vinegar to taste.

[-] 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]