Merge pull request #163 from aleffert/aleffert/locations

Add source location information to each constraint

SnapKit.xcodeproj/project.pbxproj

@@ -7,6 +7,8 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		779230441BCB6FC30027CF5F /* SourceLocation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 779230431BCB6FC30027CF5F /* SourceLocation.swift */; settings = {ASSET_TAGS = (); }; };
+		779230451BCB6FC30027CF5F /* SourceLocation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 779230431BCB6FC30027CF5F /* SourceLocation.swift */; settings = {ASSET_TAGS = (); }; };
 		EE4910981B19A26000A54F1F /* ViewController+SnapKit.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE4910971B19A26000A54F1F /* ViewController+SnapKit.swift */; };
 		EE4910991B19A40200A54F1F /* SnapKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = EEBCC9D819CC627D0083B827 /* SnapKit.framework */; };
 		EE94F6091AC0F10A008767FF /* UIKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = EE94F6081AC0F10A008767FF /* UIKit.framework */; };
@@ -51,6 +53,7 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		779230431BCB6FC30027CF5F /* SourceLocation.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SourceLocation.swift; sourceTree = "<group>"; };
 		EE4910971B19A26000A54F1F /* ViewController+SnapKit.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "ViewController+SnapKit.swift"; sourceTree = "<group>"; };
 		EE94F6081AC0F10A008767FF /* UIKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UIKit.framework; path = System/Library/Frameworks/UIKit.framework; sourceTree = SDKROOT; };
 		EE94F60A1AC0F10F008767FF /* AppKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AppKit.framework; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/AppKit.framework; sourceTree = DEVELOPER_DIR; };
@@ -156,6 +159,7 @@
 				EEFCF32B1AD910B900A425FA /* Debugging.swift */,
 				EECDB3621AC0C95C006BBC11 /* ConstraintRelation.swift */,
 				EECDB35F1AC0C95C006BBC11 /* ConstraintAttributes.swift */,
+				779230431BCB6FC30027CF5F /* SourceLocation.swift */,
 				EECDB36B1AC0C967006BBC11 /* Supporting Files */,
 				EECDB3681AC0C95C006BBC11 /* Tests */,
 			);
@@ -363,6 +367,7 @@
 				EECDB3711AC0C9A6006BBC11 /* EdgeInsets.swift in Sources */,
 				EE4910981B19A26000A54F1F /* ViewController+SnapKit.swift in Sources */,
 				EECDB36F1AC0C9A6006BBC11 /* ConstraintMaker.swift in Sources */,
+				779230441BCB6FC30027CF5F /* SourceLocation.swift in Sources */,
 				EECDB36D1AC0C9A6006BBC11 /* ConstraintAttributes.swift in Sources */,
 				EECDB3721AC0C9A6006BBC11 /* LayoutConstraint.swift in Sources */,
 				EECDB36E1AC0C9A6006BBC11 /* ConstraintItem.swift in Sources */,
@@ -390,6 +395,7 @@
 				EECDB39A1AC0CBFF006BBC11 /* EdgeInsets.swift in Sources */,
 				EECDB3981AC0CBFF006BBC11 /* ConstraintMaker.swift in Sources */,
 				EECDB3961AC0CBFF006BBC11 /* ConstraintAttributes.swift in Sources */,
+				779230451BCB6FC30027CF5F /* SourceLocation.swift in Sources */,
 				EECDB39B1AC0CBFF006BBC11 /* LayoutConstraint.swift in Sources */,
 				EECDB3971AC0CBFF006BBC11 /* ConstraintItem.swift in Sources */,
 			);

Source/Constraint.swift

@@ -58,9 +58,9 @@ public class Constraint {
     public func updatePriorityMedium() -> Void { fatalError("Must be implemented by Concrete subclass.") }
     public func updatePriorityLow() -> Void { fatalError("Must be implemented by Concrete subclass.") }
     
-    internal var makerFile: String = "Unknown"
-    internal var makerLine: UInt = 0
+    internal var makerLocation: SourceLocation = SourceLocation(file: "Unknown", line: 0)
     
+    internal(set) public var location : SourceLocation?
 }
 
 /**
@@ -130,7 +130,7 @@ internal class ConcreteConstraint: Constraint {
     }
     
     internal override func install() -> [LayoutConstraint] {
-        return self.installOnView(updateExisting: false, file: self.makerFile, line: self.makerLine)
+        return self.installOnView(updateExisting: false, location: self.makerLocation)
     }
     
     internal override func uninstall() -> Void {
@@ -195,21 +195,23 @@ internal class ConcreteConstraint: Constraint {
     
     private var installInfo: ConcreteConstraintInstallInfo? = nil
     
-    internal init(fromItem: ConstraintItem, toItem: ConstraintItem, relation: ConstraintRelation, constant: Any, multiplier: Float, priority: Float) {
+    internal init(fromItem: ConstraintItem, toItem: ConstraintItem, relation: ConstraintRelation, constant: Any, multiplier: Float, priority: Float, location : SourceLocation?) {
         self.fromItem = fromItem
         self.toItem = toItem
         self.relation = relation
         self.constant = constant
         self.multiplier = multiplier
         self.priority = priority
+        super.init()
+        self.location = location
     }
     
-    internal func installOnView(updateExisting updateExisting: Bool = false, file: String? = nil, line: UInt? = nil) -> [LayoutConstraint] {
+    internal func installOnView(updateExisting updateExisting: Bool = false, location: SourceLocation? = nil) -> [LayoutConstraint] {
         var installOnView: View? = nil
         if self.toItem.view != nil {
             installOnView = closestCommonSuperviewFromView(self.fromItem.view, toView: self.toItem.view)
             if installOnView == nil {
-                NSException(name: "Cannot Install Constraint", reason: "No common superview between views (@\(self.makerFile)#\(self.makerLine))", userInfo: nil).raise()
+                NSException(name: "Cannot Install Constraint", reason: "No common superview between views (@\(self.makerLocation.file)#\(self.makerLocation.line))", userInfo: nil).raise()
                 return []
             }
         } else {
@@ -219,7 +221,7 @@ internal class ConcreteConstraint: Constraint {
             } else {
                 installOnView = self.fromItem.view?.superview
                 if installOnView == nil {
-                    NSException(name: "Cannot Install Constraint", reason: "Missing superview (@\(self.makerFile)#\(self.makerLine))", userInfo: nil).raise()
+                    NSException(name: "Cannot Install Constraint", reason: "Missing superview (@\(self.makerLocation.file)#\(self.self.makerLocation.line))", userInfo: nil).raise()
                     return []
                 }
             }
@@ -227,7 +229,7 @@ internal class ConcreteConstraint: Constraint {
         
         if let installedOnView = self.installInfo?.view {
             if installedOnView != installOnView {
-                NSException(name: "Cannot Install Constraint", reason: "Already installed on different view. (@\(self.makerFile)#\(self.makerLine))", userInfo: nil).raise()
+                NSException(name: "Cannot Install Constraint", reason: "Already installed on different view. (@\(self.makerLocation.file)#\(self.makerLocation.line))", userInfo: nil).raise()
                 return []
             }
             return self.installInfo?.layoutConstraints.allObjects as? [LayoutConstraint] ?? []

Source/ConstraintDescription.swift

@@ -27,189 +27,318 @@ import UIKit
 import AppKit
 #endif
 
+// Type of object that can be a target of relation constraint. 
+// Doesn't cover system protocols which can't be extended with additional conformances.
+public protocol RelationTarget {
+    var constraintItem : ConstraintItem { get }
+}
+
+// Type of things that can be converted to floats. Used to provide a catch all for
+// different numeric types.
+public protocol FloatConvertible : RelationTarget {
+    var floatValue : Float { get }
+}
+
+extension FloatConvertible {
+    public var constraintItem : ConstraintItem {
+        return ConstraintItem(object: nil, attributes: ConstraintAttributes.None)
+    }
+}
+
+extension Float : FloatConvertible, RelationTarget {
+    public var floatValue : Float {
+        return self
+    }
+}
+
+extension Int : FloatConvertible, RelationTarget {
+    public var floatValue : Float {
+        return Float(self)
+    }
+}
+
+extension UInt : FloatConvertible, RelationTarget {
+    public var floatValue : Float {
+        return Float(self)
+    }
+}
+
+extension Double : FloatConvertible, RelationTarget {
+    public var floatValue : Float {
+        return Float(self)
+    }
+}
+
+extension CGFloat : FloatConvertible, RelationTarget {
+    public var floatValue : Float {
+        return Float(self)
+    }
+}
+
+@available(iOS 9.0, OSX 10.11, *)
+extension NSLayoutAnchor : RelationTarget {
+    public var constraintItem : ConstraintItem {
+        return ConstraintItem(object: self, attributes: ConstraintAttributes.None)
+    }
+}
+
+extension CGPoint : RelationTarget {
+    public var constraintItem : ConstraintItem {
+        return ConstraintItem(object: nil, attributes: ConstraintAttributes.None)
+    }
+}
+
+extension CGSize : RelationTarget {
+    public var constraintItem : ConstraintItem {
+        return ConstraintItem(object: nil, attributes: ConstraintAttributes.None)
+    }
+}
+
+extension EdgeInsets : RelationTarget {
+    public var constraintItem : ConstraintItem {
+        return ConstraintItem(object: nil, attributes: ConstraintAttributes.None)
+    }
+}
+
+extension View : RelationTarget {
+    public var constraintItem : ConstraintItem {
+        return ConstraintItem(object: self, attributes: ConstraintAttributes.None)
+    }
+}
+
+extension ConstraintItem : RelationTarget {
+    public var constraintItem : ConstraintItem {
+        return self
+    }
+}
+
 /**
     Used to expose the final API of a `ConstraintDescription` which allows getting a constraint from it
  */
-public protocol ConstraintDescriptionFinalizable: class {
+public class ConstraintDescriptionFinalizable {
     
-    var constraint: Constraint { get }
+    private let backing : ConstraintDescription
     
+    internal init(_ backing : ConstraintDescription) {
+        self.backing = backing
+    }
+    
+    public var constraint: Constraint {
+        return backing.constraint
+    }
 }
 
 /**
     Used to expose priority APIs
  */
-public protocol ConstraintDescriptionPriortizable: ConstraintDescriptionFinalizable {
-    
-    func priority(priority: Float) -> ConstraintDescriptionFinalizable
-    func priority(priority: Double) -> ConstraintDescriptionFinalizable
-    func priority(priority: CGFloat) -> ConstraintDescriptionFinalizable
-    func priority(priority: UInt) -> ConstraintDescriptionFinalizable
-    func priority(priority: Int) -> ConstraintDescriptionFinalizable
-    func priorityRequired() -> ConstraintDescriptionFinalizable
-    func priorityHigh() -> ConstraintDescriptionFinalizable
-    func priorityMedium() -> ConstraintDescriptionFinalizable
-    func priorityLow() -> ConstraintDescriptionFinalizable
+public class ConstraintDescriptionPriortizable: ConstraintDescriptionFinalizable {
+    
+    public func priority(priority: FloatConvertible) -> ConstraintDescriptionFinalizable {
+        return ConstraintDescriptionFinalizable(self.backing.priority(priority))
+    }
+    
+    public func priorityRequired() -> ConstraintDescriptionFinalizable {
+        return ConstraintDescriptionFinalizable(self.backing.priorityRequired())
+    }
+    public func priorityHigh() -> ConstraintDescriptionFinalizable {
+        return ConstraintDescriptionFinalizable(self.backing.priorityHigh())
+    }
+    public func priorityMedium() -> ConstraintDescriptionFinalizable {
+        return ConstraintDescriptionFinalizable(self.backing.priorityMedium())
+    }
+    public func priorityLow() -> ConstraintDescriptionFinalizable {
+        return ConstraintDescriptionFinalizable(self.backing.priorityLow())
+    }
 }
 
 /**
     Used to expose multiplier & constant APIs
 */
-public protocol ConstraintDescriptionEditable: ConstraintDescriptionPriortizable {
-
-    func multipliedBy(amount: Float) -> ConstraintDescriptionEditable
-    func multipliedBy(amount: Double) -> ConstraintDescriptionEditable
-    func multipliedBy(amount: CGFloat) -> ConstraintDescriptionEditable
-    func multipliedBy(amount: Int) -> ConstraintDescriptionEditable
-    func multipliedBy(amount: UInt) -> ConstraintDescriptionEditable
-    
-    func dividedBy(amount: Float) -> ConstraintDescriptionEditable
-    func dividedBy(amount: Double) -> ConstraintDescriptionEditable
-    func dividedBy(amount: CGFloat) -> ConstraintDescriptionEditable
-    func dividedBy(amount: Int) -> ConstraintDescriptionEditable
-    func dividedBy(amount: UInt) -> ConstraintDescriptionEditable
+public class ConstraintDescriptionEditable: ConstraintDescriptionPriortizable {
 
-    func offset(amount: Float) -> ConstraintDescriptionEditable
-    func offset(amount: Double) -> ConstraintDescriptionEditable
-    func offset(amount: CGFloat) -> ConstraintDescriptionEditable
-    func offset(amount: Int) -> ConstraintDescriptionEditable
-    func offset(amount: UInt) -> ConstraintDescriptionEditable
-    func offset(amount: CGPoint) -> ConstraintDescriptionEditable
-    func offset(amount: CGSize) -> ConstraintDescriptionEditable
-    func offset(amount: EdgeInsets) -> ConstraintDescriptionEditable
-    
-    func inset(amount: Float) -> ConstraintDescriptionEditable
-    func inset(amount: Double) -> ConstraintDescriptionEditable
-    func inset(amount: CGFloat) -> ConstraintDescriptionEditable
-    func inset(amount: Int) -> ConstraintDescriptionEditable
-    func inset(amount: UInt) -> ConstraintDescriptionEditable
-    func inset(amount: EdgeInsets) -> ConstraintDescriptionEditable
+    public func multipliedBy(amount: FloatConvertible) -> ConstraintDescriptionEditable {
+        return ConstraintDescriptionEditable(self.backing.multipliedBy(amount))
+    }
+    
+    public func dividedBy(amount: FloatConvertible) -> ConstraintDescriptionEditable {
+        return self.multipliedBy(1 / amount.floatValue)
+    }
+    
+    public func offset(amount : FloatConvertible) -> ConstraintDescriptionEditable {
+        return ConstraintDescriptionEditable(self.backing.offset(amount))
+    }
+    public func offset(amount: CGPoint) -> ConstraintDescriptionEditable {
+        return ConstraintDescriptionEditable(self.backing.offset(amount))
+    }
+    public func offset(amount: CGSize) -> ConstraintDescriptionEditable {
+        return ConstraintDescriptionEditable(self.backing.offset(amount))
+    }
+    public func offset(amount: EdgeInsets) -> ConstraintDescriptionEditable {
+        return ConstraintDescriptionEditable(self.backing.offset(amount))
+    }
+    
+    public func inset(amount: FloatConvertible) -> ConstraintDescriptionEditable {
+        return ConstraintDescriptionEditable(self.backing.inset(amount))
+    }
+    public func inset(amount: EdgeInsets) -> ConstraintDescriptionEditable {
+        return ConstraintDescriptionEditable(self.backing.inset(amount))
+    }
 }
 
 /**
     Used to expose relation APIs
 */
-public protocol ConstraintDescriptionRelatable: class {
+public class ConstraintDescriptionRelatable {
+
+    private let backing : ConstraintDescription
+    
+    init(_ backing : ConstraintDescription) {
+        self.backing = backing
+    }
     
-    func equalTo(other: ConstraintItem) -> ConstraintDescriptionEditable
-    func equalTo(other: View) -> ConstraintDescriptionEditable
-    @available(iOS 7.0, *)
-    func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable
-    @available(iOS 9.0, OSX 10.11, *)
-    func equalTo(other: NSLayoutAnchor) -> ConstraintDescriptionEditable
-    func equalTo(other: Float) -> ConstraintDescriptionEditable
-    func equalTo(other: Double) -> ConstraintDescriptionEditable
-    func equalTo(other: CGFloat) -> ConstraintDescriptionEditable
-    func equalTo(other: Int) -> ConstraintDescriptionEditable
-    func equalTo(other: UInt) -> ConstraintDescriptionEditable
-    func equalTo(other: CGSize) -> ConstraintDescriptionEditable
-    func equalTo(other: CGPoint) -> ConstraintDescriptionEditable
-    func equalTo(other: EdgeInsets) -> ConstraintDescriptionEditable
-    
-    func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: View) -> ConstraintDescriptionEditable
-    @available(iOS 7.0, *)
-    func lessThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable
-    @available(iOS 9.0, OSX 10.11, *)
-    func lessThanOrEqualTo(other: NSLayoutAnchor) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: Float) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: Double) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: Int) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: UInt) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: CGSize) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: CGPoint) -> ConstraintDescriptionEditable
-    func lessThanOrEqualTo(other: EdgeInsets) -> ConstraintDescriptionEditable
-    
-    func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: View) -> ConstraintDescriptionEditable
-    @available(iOS 7.0, *)
-    func greaterThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable
-    @available(iOS 9.0, OSX 10.11, *)
-    func greaterThanOrEqualTo(other: NSLayoutAnchor) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: Float) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: Double) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: Int) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: UInt) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: CGSize) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: CGPoint) -> ConstraintDescriptionEditable
-    func greaterThanOrEqualTo(other: EdgeInsets) -> ConstraintDescriptionEditable
 
+    public func equalTo(other: RelationTarget, file : String = __FILE__, line : UInt = __LINE__) -> ConstraintDescriptionEditable {
+        let location = SourceLocation(file: file, line: line)
+        return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .Equal, location: location))
+    }
+    public func equalTo(other: LayoutSupport, file : String = __FILE__, line : UInt = __LINE__) -> ConstraintDescriptionEditable {
+        let location = SourceLocation(file: file, line: line)
+        return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .Equal, location: location))
+    }
+    
+    public func lessThanOrEqualTo(other: RelationTarget, file : String = __FILE__, line : UInt = __LINE__) -> ConstraintDescriptionEditable {
+        let location = SourceLocation(file: file, line: line)
+        return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .LessThanOrEqualTo, location: location))
+    }
+    public func lessThanOrEqualTo(other: LayoutSupport, file : String = __FILE__, line : UInt = __LINE__) -> ConstraintDescriptionEditable {
+        let location = SourceLocation(file: file, line: line)
+        return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .LessThanOrEqualTo, location: location))
+    }
+    
+    public func greaterThanOrEqualTo(other: RelationTarget, file : String = __FILE__, line : UInt = __LINE__) -> ConstraintDescriptionEditable {
+        let location = SourceLocation(file: file, line: line)
+        return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .GreaterThanOrEqualTo, location: location))
+    }
+    public func greaterThanOrEqualTo(other: LayoutSupport, file : String = __FILE__, line : UInt = __LINE__) -> ConstraintDescriptionEditable {
+        let location = SourceLocation(file: file, line: line)
+        return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .GreaterThanOrEqualTo, location: location))
+    }
 }
 
 /**
     Used to expose chaining APIs
 */
-public protocol ConstraintDescriptionExtendable: ConstraintDescriptionRelatable {
-    
-    var left: ConstraintDescriptionExtendable { get }
-    var top: ConstraintDescriptionExtendable { get }
-    var bottom: ConstraintDescriptionExtendable { get }
-    var right: ConstraintDescriptionExtendable { get }
-    var leading: ConstraintDescriptionExtendable { get }
-    var trailing: ConstraintDescriptionExtendable { get }
-    var width: ConstraintDescriptionExtendable { get }
-    var height: ConstraintDescriptionExtendable { get }
-    var centerX: ConstraintDescriptionExtendable { get }
-    var centerY: ConstraintDescriptionExtendable { get }
-    var baseline: ConstraintDescriptionExtendable { get }
+public class ConstraintDescriptionExtendable: ConstraintDescriptionRelatable {
+    
+    public var left: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.left)
+    }
+    public var top: ConstraintDescriptionExtendable  {
+        return ConstraintDescriptionExtendable(self.backing.top)
+    }
+    public var bottom: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.bottom)
+    }
+    public var right: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.right)
+    }
+    public var leading: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.leading)
+    }
+    public var trailing: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.trailing)
+    }
+    public var width: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.width)
+    }
+    public var height: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.height)
+    }
+    public var centerX: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.centerX)
+    }
+    public var centerY: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.centerY)
+    }
+    public var baseline: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.baseline)
+    }
     
     @available(iOS 8.0, *)
-    var firstBaseline: ConstraintDescriptionExtendable { get }
+    public var firstBaseline: ConstraintDescriptionExtendable  {
+        return ConstraintDescriptionExtendable(self.backing.firstBaseline)
+    }
     @available(iOS 8.0, *)
-    var leftMargin: ConstraintDescriptionExtendable { get }
+    public var leftMargin: ConstraintDescriptionExtendable  {
+        return ConstraintDescriptionExtendable(self.backing.leftMargin)
+    }
     @available(iOS 8.0, *)
-    var rightMargin: ConstraintDescriptionExtendable { get }
+    public var rightMargin: ConstraintDescriptionExtendable  {
+        return ConstraintDescriptionExtendable(self.backing.rightMargin)
+    }
     @available(iOS 8.0, *)
-    var topMargin: ConstraintDescriptionExtendable { get }
+    public var topMargin: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.topMargin)
+    }
     @available(iOS 8.0, *)
-    var bottomMargin: ConstraintDescriptionExtendable { get }
+    public var bottomMargin: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.bottomMargin)
+    }
     @available(iOS 8.0, *)
-    var leadingMargin: ConstraintDescriptionExtendable { get }
+    public var leadingMargin: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.leadingMargin)
+    }
     @available(iOS 8.0, *)
-    var trailingMargin: ConstraintDescriptionExtendable { get }
+    public var trailingMargin: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.trailingMargin)
+    }
     @available(iOS 8.0, *)
-    var centerXWithinMargins: ConstraintDescriptionExtendable { get }
+    public var centerXWithinMargins: ConstraintDescriptionExtendable  {
+        return ConstraintDescriptionExtendable(self.backing.centerXWithinMargins)
+    }
     @available(iOS 8.0, *)
-    var centerYWithinMargins: ConstraintDescriptionExtendable { get }
+    public var centerYWithinMargins: ConstraintDescriptionExtendable {
+        return ConstraintDescriptionExtendable(self.backing.centerYWithinMargins)
+    }
 }
 
 /**
     Used to internally manage building constraint
  */
-internal class ConstraintDescription: ConstraintDescriptionExtendable, ConstraintDescriptionEditable, ConstraintDescriptionFinalizable {
-    
-    internal var left: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Left) }
-    internal var top: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Top) }
-    internal var right: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Right) }
-    internal var bottom: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Bottom) }
-    internal var leading: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Leading) }
-    internal var trailing: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Trailing) }
-    internal var width: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Width) }
-    internal var height: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Height) }
-    internal var centerX: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterX) }
-    internal var centerY: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterY) }
-    internal var baseline: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Baseline) }
+internal class ConstraintDescription {
+    
+    private var location : SourceLocation?
+    
+    private var left: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Left) }
+    private var top: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Top) }
+    private var right: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Right) }
+    private var bottom: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Bottom) }
+    private var leading: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Leading) }
+    private var trailing: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Trailing) }
+    private var width: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Width) }
+    private var height: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Height) }
+    private var centerX: ConstraintDescription { return self.addConstraint(ConstraintAttributes.CenterX) }
+    private var centerY: ConstraintDescription { return self.addConstraint(ConstraintAttributes.CenterY) }
+    private var baseline: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Baseline) }
     
     @available(iOS 8.0, *)
-    internal var firstBaseline: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.FirstBaseline) }
+    private var firstBaseline: ConstraintDescription { return self.addConstraint(ConstraintAttributes.FirstBaseline) }
     @available(iOS 8.0, *)
-    internal var leftMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.LeftMargin) }
+    private var leftMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.LeftMargin) }
     @available(iOS 8.0, *)
-    internal var rightMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.RightMargin) }
+    private var rightMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.RightMargin) }
     @available(iOS 8.0, *)
-    internal var topMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.TopMargin) }
+    private var topMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.TopMargin) }
     @available(iOS 8.0, *)
-    internal var bottomMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.BottomMargin) }
+    private var bottomMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.BottomMargin) }
     @available(iOS 8.0, *)
-    internal var leadingMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.LeadingMargin) }
+    private var leadingMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.LeadingMargin) }
     @available(iOS 8.0, *)
-    internal var trailingMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.TrailingMargin) }
+    private var trailingMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.TrailingMargin) }
     @available(iOS 8.0, *)
-    internal var centerXWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterXWithinMargins) }
+    private var centerXWithinMargins: ConstraintDescription { return self.addConstraint(ConstraintAttributes.CenterXWithinMargins) }
     @available(iOS 8.0, *)
-    internal var centerYWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterYWithinMargins) }
+    private var centerYWithinMargins: ConstraintDescription { return self.addConstraint(ConstraintAttributes.CenterYWithinMargins) }
     
     // MARK: initializer
     
@@ -218,259 +347,69 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
         self.toItem = ConstraintItem(object: nil, attributes: ConstraintAttributes.None)
     }
     
-    // MARK: equalTo
-    
-    internal func equalTo(other: ConstraintItem) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .Equal)
-    }
-    internal func equalTo(other: View) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .Equal)
-    }
-    @available(iOS 7.0, *)
-    internal func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .Equal)
-    }
-    @available(iOS 9.0, OSX 10.11, *)
-    internal func equalTo(other: NSLayoutAnchor) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .Equal)
-    }
-    internal func equalTo(other: Float) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .Equal)
-    }
-    internal func equalTo(other: Double) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .Equal)
-    }
-    internal func equalTo(other: CGFloat) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .Equal)
-    }
-    internal func equalTo(other: Int) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .Equal)
-    }
-    internal func equalTo(other: UInt) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .Equal)
-    }
-    internal func equalTo(other: CGSize) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .Equal)
-    }
-    internal func equalTo(other: CGPoint) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .Equal)
-    }
-    internal func equalTo(other: EdgeInsets) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .Equal)
-    }
-    
-    // MARK: lessThanOrEqualTo
-    
-    internal func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: View) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    @available(iOS 7.0, *)
-    internal func lessThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    @available(iOS 9.0, OSX 10.11, *)
-    internal func lessThanOrEqualTo(other: NSLayoutAnchor) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: Float) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: Double) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: Int) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: UInt) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: CGSize) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: CGPoint) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    internal func lessThanOrEqualTo(other: EdgeInsets) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    
-    // MARK: greaterThanOrEqualTo
-    
-    internal func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: View) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
-    }
-    @available(iOS 7.0, *)
-    internal func greaterThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
-    }
-    @available(iOS 9.0, OSX 10.11, *)
-    internal func greaterThanOrEqualTo(other: NSLayoutAnchor) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .LessThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: Float) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: Double) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .GreaterThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .GreaterThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: Int) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .GreaterThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: UInt) -> ConstraintDescriptionEditable {
-        return self.constrainTo(Float(other), relation: .GreaterThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: CGSize) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: CGPoint) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
-    }
-    internal func greaterThanOrEqualTo(other: EdgeInsets) -> ConstraintDescriptionEditable {
-        return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
-    }
-    
     // MARK: multiplier
     
-    internal func multipliedBy(amount: Float) -> ConstraintDescriptionEditable {
-        self.multiplier = amount
+    private func multipliedBy(amount: FloatConvertible) -> ConstraintDescription {
+        self.multiplier = amount.floatValue
         return self
     }
-    internal func multipliedBy(amount: Double) -> ConstraintDescriptionEditable {
-        return self.multipliedBy(Float(amount))
-    }
-    internal func multipliedBy(amount: CGFloat) -> ConstraintDescriptionEditable {
-        return self.multipliedBy(Float(amount))
-    }
-    internal func multipliedBy(amount: Int) -> ConstraintDescriptionEditable {
-        return self.multipliedBy(Float(amount))
-    }
-    internal func multipliedBy(amount: UInt) -> ConstraintDescriptionEditable {
-        return self.multipliedBy(Float(amount))
-    }
     
-    internal func dividedBy(amount: Float) -> ConstraintDescriptionEditable {
-        self.multiplier = 1.0 / amount;
+    private func dividedBy(amount: FloatConvertible) -> ConstraintDescription {
+        self.multiplier = 1.0 / amount.floatValue;
         return self
     }
-    internal func dividedBy(amount: Double) -> ConstraintDescriptionEditable {
-        return self.dividedBy(Float(amount))
-    }
-    internal func dividedBy(amount: CGFloat) -> ConstraintDescriptionEditable {
-        return self.dividedBy(Float(amount))
-    }
-    internal func dividedBy(amount: Int) -> ConstraintDescriptionEditable {
-        return self.dividedBy(Float(amount))
-    }
-    internal func dividedBy(amount: UInt) -> ConstraintDescriptionEditable {
-        return self.dividedBy(Float(amount))
-    }
     
     // MARK: offset
     
-    internal func offset(amount: Float) -> ConstraintDescriptionEditable {
-        self.constant = amount
+    private func offset(amount: FloatConvertible) -> ConstraintDescription {
+        self.constant = amount.floatValue
         return self
     }
-    internal func offset(amount: Double) -> ConstraintDescriptionEditable {
-        return self.offset(Float(amount))
-    }
-    internal func offset(amount: CGFloat) -> ConstraintDescriptionEditable {
-        return self.offset(Float(amount))
-    }
-    internal func offset(amount: Int) -> ConstraintDescriptionEditable {
-        return self.offset(Float(amount))
-    }
-    internal func offset(amount: UInt) -> ConstraintDescriptionEditable {
-        return self.offset(Float(amount))
-    }
-    internal func offset(amount: CGPoint) -> ConstraintDescriptionEditable {
+    private func offset(amount: CGPoint) -> ConstraintDescription {
         self.constant = amount
         return self
     }
-    internal func offset(amount: CGSize) -> ConstraintDescriptionEditable {
+    private func offset(amount: CGSize) -> ConstraintDescription {
         self.constant = amount
         return self
     }
-    internal func offset(amount: EdgeInsets) -> ConstraintDescriptionEditable {
+    private func offset(amount: EdgeInsets) -> ConstraintDescription {
         self.constant = amount
         return self
     }
     
     // MARK: inset
     
-    internal func inset(amount: Float) -> ConstraintDescriptionEditable {
-        let value = CGFloat(amount)
-        self.constant = EdgeInsets(top: value, left: value, bottom: -value, right: -value)
-        return self
-    }
-    internal func inset(amount: Double) -> ConstraintDescriptionEditable {
-        let value = CGFloat(amount)
-        self.constant = EdgeInsets(top: value, left: value, bottom: -value, right: -value)
-        return self
-    }
-    internal func inset(amount: CGFloat) -> ConstraintDescriptionEditable {
-        self.constant = EdgeInsets(top: amount, left: amount, bottom: -amount, right: -amount)
-        return self
-    }
-    internal func inset(amount: Int) -> ConstraintDescriptionEditable {
-        let value = CGFloat(amount)
-        self.constant = EdgeInsets(top: value, left: value, bottom: -value, right: -value)
-        return self
-    }
-    internal func inset(amount: UInt) -> ConstraintDescriptionEditable {
-        let value = CGFloat(amount)
+    private func inset(amount: FloatConvertible) -> ConstraintDescription {
+        let value = CGFloat(amount.floatValue)
         self.constant = EdgeInsets(top: value, left: value, bottom: -value, right: -value)
         return self
     }
-    internal func inset(amount: EdgeInsets) -> ConstraintDescriptionEditable {
+    private func inset(amount: EdgeInsets) -> ConstraintDescription {
         self.constant = EdgeInsets(top: amount.top, left: amount.left, bottom: -amount.bottom, right: -amount.right)
         return self
     }
     
     // MARK: priority
     
-    internal func priority(priority: Float) -> ConstraintDescriptionFinalizable {
-        self.priority = priority
+    private func priority(priority: FloatConvertible) -> ConstraintDescription {
+        self.priority = priority.floatValue
         return self
     }
-    internal func priority(priority: Double) -> ConstraintDescriptionFinalizable {
-        return self.priority(Float(priority))
-    }
-    internal func priority(priority: CGFloat) -> ConstraintDescriptionFinalizable {
-        return self.priority(Float(priority))
-    }
-    func priority(priority: UInt) -> ConstraintDescriptionFinalizable {
-        return self.priority(Float(priority))
-    }
-    internal func priority(priority: Int) -> ConstraintDescriptionFinalizable {
-        return self.priority(Float(priority))
-    }
-    internal func priorityRequired() -> ConstraintDescriptionFinalizable {
+    private func priorityRequired() -> ConstraintDescription {
         return self.priority(1000.0)
     }
-    internal func priorityHigh() -> ConstraintDescriptionFinalizable {
+    private func priorityHigh() -> ConstraintDescription {
         return self.priority(750.0)
     }
-    internal func priorityMedium() -> ConstraintDescriptionFinalizable {
+    private func priorityMedium() -> ConstraintDescription {
         #if os(iOS) || os(tvOS)
         return self.priority(500.0)
         #else
         return self.priority(501.0)
         #endif
     }
-    internal func priorityLow() -> ConstraintDescriptionFinalizable {
+    private func priorityLow() -> ConstraintDescription {
         return self.priority(250.0)
     }
     
@@ -487,7 +426,9 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
                 relation: self.relation!,
                 constant: self.constant,
                 multiplier: self.multiplier,
-                priority: self.priority)
+                priority: self.priority,
+                location: self.location
+            )
         }
         return self.concreteConstraint!
     }
@@ -539,59 +480,35 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
         return self
     }
     
-    private func constrainTo(other: ConstraintItem, relation: ConstraintRelation) -> ConstraintDescription {
-        if other.attributes != ConstraintAttributes.None {
-            let toLayoutAttributes = other.attributes.layoutAttributes
+    private func constrainTo(other: RelationTarget, relation: ConstraintRelation, location : SourceLocation) -> ConstraintDescription {
+        
+        self.location = location
+        
+        if let constant = other as? FloatConvertible {
+            self.constant = constant.floatValue
+        }
+        
+        let item = other.constraintItem
+        
+        if item.attributes != ConstraintAttributes.None {
+            let toLayoutAttributes = item.attributes.layoutAttributes
             if toLayoutAttributes.count > 1 {
                 let fromLayoutAttributes = self.fromItem.attributes.layoutAttributes
                 if toLayoutAttributes != fromLayoutAttributes {
                     NSException(name: "Invalid Constraint", reason: "Cannot constrain to multiple non identical attributes", userInfo: nil).raise()
                     return self
                 }
-                other.attributes = ConstraintAttributes.None
+                item.attributes = ConstraintAttributes.None
             }
         }
-        self.toItem = other
+        self.toItem = item
         self.relation = relation
         return self
     }
     
-    private func constrainTo(other: View, relation: ConstraintRelation) -> ConstraintDescription {
-        return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)
-    }
-    
     @available(iOS 7.0, *)
-    private func constrainTo(other: LayoutSupport, relation: ConstraintRelation) -> ConstraintDescription {
-        return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)
+    private func constrainTo(other: LayoutSupport, relation: ConstraintRelation, location : SourceLocation) -> ConstraintDescription {
+        return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation, location: location)
     }
     
-    @available(iOS 9.0, OSX 10.11, *)
-    private func constrainTo(other: NSLayoutAnchor, relation: ConstraintRelation) -> ConstraintDescription {
-        return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)
-    }
-    
-    private func constrainTo(other: Float, relation: ConstraintRelation) -> ConstraintDescription {
-        self.constant = other
-        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
-    }
-    
-    private func constrainTo(other: Double, relation: ConstraintRelation) -> ConstraintDescription {
-        self.constant = other
-        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
-    }
-    
-    private func constrainTo(other: CGSize, relation: ConstraintRelation) -> ConstraintDescription {
-        self.constant = other
-        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
-    }
-    
-    private func constrainTo(other: CGPoint, relation: ConstraintRelation) -> ConstraintDescription {
-        self.constant = other
-        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
-    }
-    
-    private func constrainTo(other: EdgeInsets, relation: ConstraintRelation) -> ConstraintDescription {
-        self.constant = other
-        return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
-    }
 }

Source/ConstraintMaker.swift

@@ -118,72 +118,66 @@ public class ConstraintMaker {
     @available(iOS 8.0, *)
     public var centerWithinMargins: ConstraintDescriptionExtendable { return self.makeConstraintDescription(ConstraintAttributes.CenterWithinMargins) }
     
-    internal init(view: View, file: String, line: UInt) {
+    internal init(view: View, location: SourceLocation) {
         self.view = view
-        self.file = file
-        self.line = line
+        self.location = location
     }
     
-    internal let file: String
-    internal let line: UInt
+    internal let location: SourceLocation
     internal let view: View
     internal var constraintDescriptions = [ConstraintDescription]()
     
-    internal func makeConstraintDescription(attributes: ConstraintAttributes) -> ConstraintDescription {
+    internal func makeConstraintDescription(attributes: ConstraintAttributes) -> ConstraintDescriptionExtendable {
         let item = ConstraintItem(object: self.view, attributes: attributes)
         let constraintDescription = ConstraintDescription(fromItem: item)
         self.constraintDescriptions.append(constraintDescription)
-        return constraintDescription
+        return ConstraintDescriptionExtendable(constraintDescription)
     }
     
-    internal class func prepareConstraints(view view: View, file: String = "Unknown", line: UInt = 0, @noescape closure: (make: ConstraintMaker) -> Void) -> [Constraint] {
-        let maker = ConstraintMaker(view: view, file: file, line: line)
+    internal class func prepareConstraints(view view: View, location: SourceLocation, @noescape closure: (make: ConstraintMaker) -> Void) -> [Constraint] {
+        let maker = ConstraintMaker(view: view, location : location)
         closure(make: maker)
         
         let constraints = maker.constraintDescriptions.map { $0.constraint }
         for constraint in constraints {
-            constraint.makerFile = maker.file
-            constraint.makerLine = maker.line
+            constraint.makerLocation = maker.location
         }
         return constraints
     }
     
-    internal class func makeConstraints(view view: View, file: String = "Unknown", line: UInt = 0, @noescape closure: (make: ConstraintMaker) -> Void) {
+    internal class func makeConstraints(view view: View, location: SourceLocation, @noescape closure: (make: ConstraintMaker) -> Void) {
         view.translatesAutoresizingMaskIntoConstraints = false
-        let maker = ConstraintMaker(view: view, file: file, line: line)
+        let maker = ConstraintMaker(view: view, location: location)
         closure(make: maker)
         
         let constraints = maker.constraintDescriptions.map { $0.constraint as! ConcreteConstraint }
         for constraint in constraints {
-            constraint.makerFile = maker.file
-            constraint.makerLine = maker.line
+            constraint.makerLocation = maker.location
             constraint.installOnView(updateExisting: false)
         }
     }
     
-    internal class func remakeConstraints(view view: View, file: String = "Unknown", line: UInt = 0, @noescape closure: (make: ConstraintMaker) -> Void) {
+    internal class func remakeConstraints(view view: View, location : SourceLocation, @noescape closure: (make: ConstraintMaker) -> Void) {
         view.translatesAutoresizingMaskIntoConstraints = false
-        let maker = ConstraintMaker(view: view, file: file, line: line)
+        let maker = ConstraintMaker(view: view, location: location)
         closure(make: maker)
         
         self.removeConstraints(view: view)
         let constraints = maker.constraintDescriptions.map { $0.constraint as! ConcreteConstraint }
         for constraint in constraints {
-            constraint.makerFile = maker.file
-            constraint.makerLine = maker.line
+            constraint.makerLocation = maker.location
             constraint.installOnView(updateExisting: false)
         }
     }
     
-    internal class func updateConstraints(view view: View, file: String = "Unknown", line: UInt = 0, @noescape closure: (make: ConstraintMaker) -> Void) {
+    internal class func updateConstraints(view view: View, location: SourceLocation, @noescape closure: (make: ConstraintMaker) -> Void) {
         view.translatesAutoresizingMaskIntoConstraints = false
-        let maker = ConstraintMaker(view: view, file: file, line: line)
+        let maker = ConstraintMaker(view: view, location: location)
         closure(make: maker)
         
         let constraints = maker.constraintDescriptions.map { $0.constraint as! ConcreteConstraint}
         for constraint in constraints {
-            constraint.makerFile = maker.file
-            constraint.makerLine = maker.line
+            constraint.makerLocation = maker.location
             constraint.installOnView(updateExisting: true)
         }
     }

Source/Debugging.swift

@@ -101,11 +101,11 @@ public extension LayoutConstraint {
     }
     
     internal var snp_makerFile: String? {
-        return self.snp_constraint?.makerFile
+        return self.snp_constraint?.makerLocation.file
     }
     
     internal var snp_makerLine: UInt? {
-        return self.snp_constraint?.makerLine
+        return self.snp_constraint?.makerLocation.line
     }
     
 }

Source/LayoutConstraint.swift

@@ -34,6 +34,9 @@ public class LayoutConstraint: NSLayoutConstraint {
     
     internal var snp_constraint: Constraint? = nil
     
+    public var snp_location: SourceLocation? {
+        return snp_constraint?.location
+    }
 }
 
 internal func ==(left: LayoutConstraint, right: LayoutConstraint) -> Bool {

Source/SourceLocation.swift

@@ -0,0 +1,36 @@
+//
+//  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.
+
+public struct SourceLocation {
+    
+    public let file : String
+    public let line : UInt
+    
+    init(file : String, line : UInt) {
+        self.file = file
+        self.line = line
+    }
+    
+}
+
+

Source/View+SnapKit.swift

@@ -128,7 +128,7 @@ public extension View {
         :returns: the constraints made
     */
     public func snp_prepareConstraints(file: String = __FILE__, line: UInt = __LINE__, @noescape closure: (make: ConstraintMaker) -> Void) -> [Constraint] {
-        return ConstraintMaker.prepareConstraints(view: self, file: file, line: line, closure: closure)
+        return ConstraintMaker.prepareConstraints(view: self, location: SourceLocation(file: file, line: line), closure: closure)
     }
     
     /**
@@ -137,7 +137,7 @@ public extension View {
         :param: closure that will be passed the `ConstraintMaker` to make the constraints with
     */
     public func snp_makeConstraints(file: String = __FILE__, line: UInt = __LINE__, @noescape closure: (make: ConstraintMaker) -> Void) -> Void {
-        ConstraintMaker.makeConstraints(view: self, file: file, line: line, closure: closure)
+        ConstraintMaker.makeConstraints(view: self, location: SourceLocation(file: file, line: line), closure: closure)
     }
     
     /**
@@ -148,7 +148,7 @@ public extension View {
         :param: closure that will be passed the `ConstraintMaker` to update the constraints with
     */
     public func snp_updateConstraints(file: String = __FILE__, line: UInt = __LINE__, @noescape closure: (make: ConstraintMaker) -> Void) -> Void {
-        ConstraintMaker.updateConstraints(view: self, file: file, line: line, closure: closure)
+        ConstraintMaker.updateConstraints(view: self, location: SourceLocation(file: file, line: line), closure: closure)
     }
     
     /**
@@ -157,7 +157,7 @@ public extension View {
         :param: closure that will be passed the `ConstraintMaker` to remake the constraints with
     */
     public func snp_remakeConstraints(file: String = __FILE__, line: UInt = __LINE__, @noescape closure: (make: ConstraintMaker) -> Void) -> Void {
-        ConstraintMaker.remakeConstraints(view: self, file: file, line: line, closure: closure)
+        ConstraintMaker.remakeConstraints(view: self, location: SourceLocation(file: file, line: line), closure: closure)
     }
     
     /**