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/*
This source file is part of the Swift.org open source project
Copyright (c) 2021-2023 Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See https://swift.org/LICENSE.txt for license information
See https://swift.org/CONTRIBUTORS.txt for Swift project authors
*/
import Foundation
/// A builder that collects ``Differences`` between two objects of the same type.
///
/// The DifferenceBuilder is used when diffing two ``RenderNode`` objects against each other.
/// Initalize the DifferenceBuilder with the two.
struct DifferenceBuilder<T> {
var differences: JSONPatchDifferences
let current: T
let other: T
let path: CodablePath
init(current: T, other: T, basePath: CodablePath) {
self.differences = []
self.current = current
self.other = other
self.path = basePath
}
/// Adds the difference between two properties to the DifferenceBuilder.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, some Equatable & Encodable>, forKey codingKey: CodingKey)
{
let currentProperty = current[keyPath: keyPath]
let otherProperty = other[keyPath: keyPath]
if currentProperty != otherProperty {
differences.append(.replace(pointer: JSONPointer(from: path + [codingKey]), encodableValue: currentProperty))
}
}
/// Determines the difference between the two diffable objects at the KeyPaths given.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, some RenderJSONDiffable & Equatable & Encodable>, forKey codingKey: CodingKey)
{
let currentProperty = current[keyPath: keyPath]
let otherProperty = other[keyPath: keyPath]
if currentProperty == otherProperty {
return
}
if currentProperty.isSimilar(to: otherProperty) {
differences.append(contentsOf: currentProperty.difference(from: otherProperty, at: path + [codingKey]))
} else {
differences.append(.replace(pointer: JSONPointer(from: path + [codingKey]), encodableValue: currentProperty))
}
}
/// Determines the difference between the two arrays of diffable objects at the KeyPaths given.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, [String: some RenderJSONDiffable & Equatable & Encodable]>, forKey codingKey: CodingKey)
{
let currentProperty = current[keyPath: keyPath]
let otherProperty = other[keyPath: keyPath]
if currentProperty == otherProperty {
return
}
if currentProperty.isSimilar(to: otherProperty) {
differences.append(contentsOf: currentProperty.difference(from: otherProperty, at: path + [codingKey]))
} else {
differences.append(.replace(pointer: JSONPointer(from: path + [codingKey]), encodableValue: currentProperty))
}
}
/// Determines the difference between the two dictionaries mapping strings to diffable objects at the KeyPaths given.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, [some RenderJSONDiffable & Equatable & Codable]>, forKey codingKey: CodingKey)
{
let currentProperty = current[keyPath: keyPath]
let otherProperty = other[keyPath: keyPath]
if currentProperty == otherProperty {
return
}
if currentProperty.isSimilar(to: otherProperty) {
differences.append(contentsOf: currentProperty.difference(from: otherProperty, at: path + [codingKey]))
} else {
differences.append(.replace(pointer: JSONPointer(from: path + [codingKey]), encodableValue: currentProperty))
}
}
/// Determines the difference between the two dictionaries mapping strings to diffable objects at the KeyPaths given.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, [some RenderJSONDiffable & Equatable & Codable]?>, forKey codingKey: CodingKey)
{
let currentProperty = current[keyPath: keyPath]
let otherProperty = other[keyPath: keyPath]
if currentProperty == otherProperty {
return
}
if currentProperty.isSimilar(to: otherProperty) {
differences.append(contentsOf: currentProperty.difference(from: otherProperty, at: path + [codingKey]))
} else {
differences.append(.replace(pointer: JSONPointer(from: path + [codingKey]), encodableValue: currentProperty))
}
}
/// Determines the difference between the two dictionaries mapping strings to arrays of diffable objects at the KeyPaths given.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, [String: [some RenderJSONDiffable & Equatable & Encodable]]>, forKey codingKey: CodingKey)
{
let currentProperty = current[keyPath: keyPath]
let otherProperty = other[keyPath: keyPath]
if currentProperty == otherProperty {
return
}
if currentProperty.isSimilar(to: otherProperty) {
differences.append(contentsOf: currentProperty.arrayValueDifference(from: otherProperty, at: path + [codingKey]))
} else {
differences.append(.replace(pointer: JSONPointer(from: path + [codingKey]), encodableValue: currentProperty))
}
}
/// Unwraps and adds the difference between two optional RenderSections.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, RenderSection?>, forKey key: CodingKey) {
let currentProperty = current[keyPath: keyPath]
let otherProperty = other[keyPath: keyPath]
if let currentProperty, let otherProperty {
let anyCurrent = AnyRenderSection(currentProperty)
let anyOther = AnyRenderSection(otherProperty)
if anyCurrent.isSimilar(to: anyOther) {
differences.append(contentsOf: anyCurrent.difference(from: anyOther, at: path + [key]))
} else {
differences.append(.replace(pointer: JSONPointer(from: path + [key]), encodableValue: currentProperty))
}
} else if otherProperty != nil {
differences.append(.remove(pointer: JSONPointer(from: path + [key])))
} else if let currentProp = currentProperty {
differences.append(.add(pointer: JSONPointer(from: path + [key]), encodableValue: currentProp))
}
}
/// Determines the difference between the two diffable Arrays of RenderSections at the KeyPaths given.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, [RenderSection]>, forKey codingKey: CodingKey) {
let currentArray = current[keyPath: keyPath]
let otherArray = other[keyPath: keyPath]
let typeErasedCurrentArray = currentArray.map { section in
return AnyRenderSection(section)
}
let typeErasedOtherArray = otherArray.map { section in
return AnyRenderSection(section)
}
if typeErasedCurrentArray == typeErasedOtherArray {
return
}
if typeErasedCurrentArray.isSimilar(to: typeErasedOtherArray) {
differences.append(contentsOf: typeErasedCurrentArray.difference(from: typeErasedOtherArray, at: path + [codingKey]))
} else {
differences.append(.replace(pointer: JSONPointer(from: path + [codingKey]), encodableValue: typeErasedCurrentArray))
}
}
/// Determines the difference between the two dictionaries of RenderReferences at the KeyPaths given.
mutating func addDifferences(atKeyPath keyPath: KeyPath<T, [String: RenderReference]>, forKey codingKey: CodingKey) {
let currentDict = current[keyPath: keyPath].mapValues { section in
return AnyRenderReference(section)
}
let otherDict = other[keyPath: keyPath].mapValues { section in
return AnyRenderReference(section)
}
if currentDict == otherDict {
return
}
differences.append(contentsOf: currentDict.difference(from: otherDict, at: path + [codingKey]))
}
}
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