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Remove Syntax.Empty.

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This commit is contained in:
Rob Rix 2015-10-02 12:37:09 -04:00
parent 3cae5390b7
commit 05a7c1a037
2 changed files with 2 additions and 13 deletions
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11
prototype/Doubt/Syntax.swift
View File

@ -31,14 +31,11 @@ public func == <A: Equatable> (left: Term<A>, right: Term<A>) -> Bool {
/// A node in a syntax tree. Expressed algebraically to enable representation of both normal syntax trees and their diffs.
public enum Syntax<Recur, A>: CustomDebugStringConvertible, CustomDocConvertible {
case Empty
case Leaf(A)
case Branch(Recur)
public func map<T>(@noescape transform: Recur -> T) -> Syntax<T, A> {
switch self {
case .Empty:
return .Empty
case let .Leaf(n):
return .Leaf(n)
case let .Branch(x):
@ -58,8 +55,6 @@ public enum Syntax<Recur, A>: CustomDebugStringConvertible, CustomDocConvertible
public var debugDescription: String {
switch self {
case .Empty:
return ".Empty"
case let .Leaf(n):
return ".Leaf(\(n))"
case let .Branch(x):
@ -69,8 +64,6 @@ public enum Syntax<Recur, A>: CustomDebugStringConvertible, CustomDocConvertible
public var doc: Doc {
switch self {
case .Empty:
return .Empty
case let .Leaf(n):
return Doc(n)
case let .Branch(x):
@ -82,8 +75,6 @@ public enum Syntax<Recur, A>: CustomDebugStringConvertible, CustomDocConvertible
extension Syntax where A: Equatable {
public static func equals(recur: (Recur, Recur) -> Bool)(_ left: Syntax<Recur, A>, _ right: Syntax<Recur, A>) -> Bool {
switch (left, right) {
case (.Empty, .Empty):
return true
case let (.Leaf(l1), .Leaf(l2)):
return l1 == l2
case let (.Branch(v1), .Branch(v2)):
@ -108,8 +99,6 @@ extension Term where A: Hashable {
extension Syntax where A: Hashable {
public func hash(recur: Recur -> Hash) -> Hash {
switch self {
case .Empty:
return Hash("Empty")
case let .Leaf(n):
return Hash("Leaf", Hash(n))
case let .Branch(x):

4
prototype/DoubtTests/DiffTests.swift
View File

@ -4,11 +4,11 @@ final class DiffTests: XCTestCase {
}
func testSESOverEmptyAndNonEmptyCollectionsIsInsertions() {
XCTAssertEqual(Diff.diff([], [ a, b ]), [ Diff.Patch(.Empty, a), Diff.Patch(.Empty, b) ])
XCTAssertEqual(Diff.diff([], [ a, b ]), [ Diff.Patch(nil, a), Diff.Patch(nil, b) ])
}
func testSESOverNonEmptyAndEmptyCollectionsIsDeletions() {
XCTAssertEqual(Diff.diff([ a, b ], []), [ Diff.Patch(a, .Empty), Diff.Patch(b, .Empty) ])
XCTAssertEqual(Diff.diff([ a, b ], []), [ Diff.Patch(a, nil), Diff.Patch(b, nil) ])
}
func testSESCanInsertAtHead() {