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grammar.lark

+// Author: Liam Esteban Prince
+// Description: EBNF context free grammar for cooking recipe
+
+%ignore " "
+%import common.NUMBER
+
+ambiguator: ("<" | ">" | "less than" | "more than")
+
+// amount: quantity of an ingredient
+// eg: 10 - 20 g of pasta
+amount: ambiguator* NUMBER+ ("-" | "/" | "to")? NUMBER*
+
+// UNIT: unit of measure
+// recognises synonyms or shorthand
+// eg: "cup", "grams", "pinch". shorthand: "g", "gr"
+UNIT: ("gr" | "g")
+
+// ingredient:
+ingredient: modifier* ingredient (modifier ",")*
+
+// modifier: a word or phrase that modifies the ingredient
+// eg: "pears, chopped", "chopped pears", "chicken, skin on"
+// usually ends in "ed"
+modifier: verb | ingredient adverb
+
+adverb:
+
+// UTENSIL: an auxiliary object used by the action
+// eg: "bowl", "pan"
+UTENSIL: ("bowl" | "pan")
+
+// instruction: a verb applied to one or more ingredients
+// does not apply to gerunds like "stirring constantly"
+// eg: "mix the bell pepper with the chicken"
+instruction: verb ( PREPOSITION ( verb )? PREPOSITION? ( ingredient* | UTENSIL | mixture ) ) PREPOSITION+ UTENSIL
+
+verb:
+
+// mixture: a way to refer to multiple previous ingredients
+// usually as a result of a previous step in the method
+// eg: "spices", "dry ingredients"
+mixture:
+
+// PREPOSITION: word used to link nouns, pronouns, or phrases to other words within a sentence
+PREPOSITION: ("with" | "to" | "in" | "of" | "at" | "for" | "off" | "on" | "over" | "under" | "until")
+
+// ARTICLE: word used with a noun to specify grammatical definiteness
+ARTICLE: ("a" | "an" | "the")
+
+// CONJUNCTION: word used to connect words, phrases, clauses, or sentences
+CONJUNCTION: ("and" | "or" | "but")
+
+// ADJECTIVE:
+ADJECTIVE: ("red" | "fast")
+
+// ADVERB:
+ADVERB: ("quickly")
+
+// PUNCTUATION
+// Ignore punctuation
+PUNCTUATION: "."
+
+!start: ADVERB PUNCTUATION+ CONJUNCTION