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I m p r o v i n g y o u r Developer Experienc e with Open-Source Swift Dimitri Dupuis-Latour @dupuislatour 2018

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Story

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Xcode in Xcode Xcode.xcodeproj

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Xcode in Xcode

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Xcode in Xcode 1

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Swift

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Open-Source Swift

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Open-Source Swift

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Open-Source Swift

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How ?

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Toolchain

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Toolchain

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Toolchain

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How ?

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https://github.com/apple/swift README git clone 1 repository ./swift/utils/update-checkout 14 repositories 2GB source code ./swift/utils/build-script ≈1 hour (full build in debug) ≈70 GB of build artifacts

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Swift checkout

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Swift checkout

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Swift checkout

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Swift checkout

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Compiler 
 aka ‘lib’

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Compiler 
 aka ‘lib’ AST SourceKit Fixits Warnings Refactoring Engine

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Compiler 
 aka ‘lib’ AST SourceKit Fixits Warnings Refactoring Engine

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Refactoring Engine

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Refactoring Engine Xcode SourceKit

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Adding a new Refactoring « Frenchify »

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Refactoring Engine RefactoringKinds.def : CURSOR_REFACTORING(Frenchify, "Frenchify", frenchify.expr)

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Refactoring Engine RefactoringKinds.def : CURSOR_REFACTORING(Frenchify, "Frenchify", frenchify.expr) Refactoring.cpp : bool RefactoringActionFrenchify::isApplicable(ResolvedCursorInfo CursorInfo) { return true; }

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Refactoring Engine RefactoringKinds.def : CURSOR_REFACTORING(Frenchify, "Frenchify", frenchify.expr) Refactoring.cpp : bool RefactoringActionFrenchify::isApplicable(ResolvedCursorInfo CursorInfo) { return true; } bool RefactoringActionFrenchify::performChange() { return false; // Return true if code change aborted. }

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Refactoring Engine RefactoringKinds.def : CURSOR_REFACTORING(Frenchify, "Frenchify", frenchify.expr) Refactoring.cpp : bool RefactoringActionFrenchify::isApplicable(ResolvedCursorInfo CursorInfo) { return true; } bool RefactoringActionFrenchify::performChange() { EditConsumer.insert(SM, Cursor.TrailingExpr->getStartLoc(), "Le "); return false; // Return true if code change aborted. }

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Refactoring Engine RefactoringKinds.def : CURSOR_REFACTORING(Frenchify, "Frenchify", frenchify.expr) Refactoring.cpp : bool RefactoringActionFrenchify::isApplicable(ResolvedCursorInfo CursorInfo) { return true; } bool RefactoringActionFrenchify::performChange() { EditConsumer.insert(SM, Cursor.TrailingExpr->getStartLoc(), "Le "); EditConsumer.insertAfter(SM, Cursor.TrailingExpr->getEndLoc(), " "); return false; // Return true if code change aborted. }

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Xcode

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Le Xcode

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https://swift.org/blog/swift-local-refactoring More Examples

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"But I am not a compiler engineer !" — Joe, average iOS developper

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https://github.com/apple/swift

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Standard Library 
 aka ‘stdlib’

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Bool.toggle() Swift 4.2, Chris Eidhof extension Bool { @_inlineable /// Toggles the value of the Boolean. /// /// Calling this method sets the variable to `true` if it was `false`, /// and sets it to `false` if it was `true`. For example: /// /// var bools = [true, false] /// /// bools[0].toggle() /// // bools now contains [false, false] public mutating func toggle() { self = !self } } [SE-0199] Adding toggle to Bool

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Dictionary.compactMapValues() Swift 5 /// Returns a new dictionary containing the keys of this dictionary with the /// values transformed by the given closure. /// - Parameter transform: A closure that transforms a value. `transform` /// accepts each value of the dictionary as its parameter and returns a /// transformed value of the same or of a different type. /// - Returns: A dictionary containing the keys and transformed values of /// this dictionary. @inlinable // FIXME(sil-serialize-all) public func compactMapValues( _ transform: (Value) throws -> T? ) rethrows -> Dictionary { return try self.reduce(into: [Key: T](), { (result, x) in if let value = try transform(x.value) { result[x.key] = value } }) } [SE-0218] Introduce compactMapValues to Dictionary

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Sequence.countWhere() Swift 5 [SE-0220] count(where:) extension Sequence { /// Returns the number of elements in the sequence that satisfy the given /// predicate. /// /// […] /// - Parameter predicate: A closure that takes each element of the sequence /// as its argument and returns a Boolean value indicating whether /// the element should be included in the count. /// - Returns: The number of elements in the sequence that satisfy the given /// predicate. @inlinable public func count( where predicate: (Element) throws -> Bool ) rethrows -> Int { var count = 0 for e in self { if try predicate(e) { count += 1 } } return count } }

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Let’s talk !