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Pods/SnapKit/Sources/ConstraintDescription.swift

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+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public class ConstraintDescription {
+    
+    internal let item: LayoutConstraintItem
+    internal var attributes: ConstraintAttributes
+    internal var relation: ConstraintRelation? = nil
+    internal var sourceLocation: (String, UInt)? = nil
+    internal var label: String? = nil
+    internal var related: ConstraintItem? = nil
+    internal var multiplier: ConstraintMultiplierTarget = 1.0
+    internal var constant: ConstraintConstantTarget = 0.0
+    internal var priority: ConstraintPriorityTarget = 1000.0
+    internal lazy var constraint: Constraint? = {
+        guard let relation = self.relation,
+              let related = self.related,
+              let sourceLocation = self.sourceLocation else {
+            return nil
+        }
+        let from = ConstraintItem(target: self.item, attributes: self.attributes)
+        
+        return Constraint(
+            from: from,
+            to: related,
+            relation: relation,
+            sourceLocation: sourceLocation,
+            label: self.label,
+            multiplier: self.multiplier,
+            constant: self.constant,
+            priority: self.priority
+        )
+    }()
+    
+    // MARK: Initialization
+    
+    internal init(item: LayoutConstraintItem, attributes: ConstraintAttributes) {
+        self.item = item
+        self.attributes = attributes
+    }
+    
+}