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Add a function from categorization functions to comparable functions.

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This commit is contained in:
Rob Rix 2015-10-15 15:39:55 -04:00
parent 2d21447312
commit f8cd049280
1 changed files with 8 additions and 0 deletions
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8
prototype/Doubt/Interpreter.swift
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@ -16,6 +16,14 @@ public struct Interpreter<Term: TermType> {
self.cost = cost
}
/// Computes a term comparable function from a categorizing function.
public static func comparable<C>(categorize: Term -> Set<C>)(_ a: Term, _ b: Term) -> Bool {
let c0 = categorize(a)
let c1 = categorize(b)
return c0 == c1 || !categorize(a).intersect(categorize(b)).isEmpty
}
/// Computes a diff cost function from a patch cost function.
public static func cost(cost: Patch<Term> -> Int)(_ diff: Diff) -> Int {
return diff.map(cost).reduce(0, combine: +)