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Compute the size of syntax trees.

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This commit is contained in:
Rob Rix 2015-10-14 14:32:26 -04:00
parent 6b781622b6
commit 645e038982
1 changed files with 11 additions and 0 deletions
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11
prototype/doubt-json/main.swift
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@ -71,6 +71,17 @@ extension JSON {
func annotate(json: Syntax<Term, JSONLeaf>) -> Term {
return Cofree(0, json)
}
func size(syntax: Syntax<Term, JSONLeaf>) -> Int {
switch syntax {
case .Leaf:
return 1
case let .Indexed(i):
return 1 + i.map { size($0.unwrap) }.reduce(0, combine: +)
case let .Keyed(i):
return 1 + i.values.map { size($0.unwrap) }.reduce(0, combine: +)
}
}
switch self {
case let .Array(a):
return annotate(.Indexed(a.map { $0.term }))