/usr/share/doc/libparse-recdescent-perl/examples/demo_recipe.pl is in libparse-recdescent-perl 1.967013+dfsg-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | #!/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'
Ingredient:
'potatoes'
| 'lard'
| 'olive oil'
| 'sugar'
| 'bacon fat'
| 'butter'
| 'salt'
| 'vinegar'
IngredientQualifier:
Amount
| Number
| 'a'
| 'some'
| 'large'
| 'small'
Amount: Number QuantityUnit
ReferenceQualifier:
'the'
| 'those'
| 'each'
| 'half the'
Number:
/[1-9][0-9]*/
| /one|two|three|four|five|six|seven|eight|nine/
| 'a dozen'
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.
|