45 lines
1.2 KiB
Racket
45 lines
1.2 KiB
Racket
#lang typed/racket
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;;; dds/rs
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;;; Definitions for working with reaction systems.
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(provide
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;; Structures
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reaction
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;; Type names
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Species ReactionSystem
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;; Functions
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enabled? list-enabled)
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;;; =================
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;;; Basic definitions
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;;; =================
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;;; A species is a symbol.
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(define-type Species Symbol)
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;;; A reaction is a triple of sets, giving the reactants, the
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;;; inhibitors, and the products, respectively.
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(struct reaction ([reactants : (Setof Symbol)]
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[inhibitors : (Setof Symbol)]
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[products : (Setof Symbol)]))
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;;; A reaction is enabled on a set if all of its reactants are in the
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;;; set and none of its inhibitors are.
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(: enabled? (-> reaction (Setof Symbol) Boolean))
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(define/match (enabled? r s)
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[((reaction r i p) s)
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(and (subset? r s) (set-empty? (set-intersect i s)))])
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;;; A reaction system is a dictionary mapping reaction names to
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;;; reactions.
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(define-type ReactionSystem (HashTable Symbol reaction))
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;;; Returns the list of reaction names enabled on a given set.
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(: list-enabled (-> ReactionSystem (Setof Symbol) (Listof Symbol)))
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(define (list-enabled rs s)
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(for/list ([(name reaction) (in-hash rs)]
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#:when (enabled? reaction s))
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name))
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