initial commit

.gitignore

@@ -0,0 +1,19 @@
+# Xcode
+build/*
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+*.xcworkspace
+!default.xcworkspace
+xcuserdata
+profile
+*.moved-aside
+# Desktop Servies
+.DS_Store
+Podfile.lock
+/Pods/

Masonry.xcodeproj/project.pbxproj

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Masonry.xcodeproj/xcshareddata/xcschemes/Masonry.xcscheme

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8"?>
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+   LastUpgradeVersion = "0460"
+   version = "1.3">
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+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
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+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DD52F1A9179CA93B005CD195"
+               BuildableName = "libMasonry.a"
+               BlueprintName = "Masonry"
+               ReferencedContainer = "container:Masonry.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      buildConfiguration = "Debug">
+      <Testables>
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+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DD52F1BA179CA93B005CD195"
+               BuildableName = "MasonryTests.octest"
+               BlueprintName = "MasonryTests"
+               ReferencedContainer = "container:Masonry.xcodeproj">
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+      </Testables>
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+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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+      buildConfiguration = "Debug"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
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+   </LaunchAction>
+   <ProfileAction
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+      savedToolIdentifier = ""
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+      buildConfiguration = "Release"
+      debugDocumentVersioning = "YES">
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+   <AnalyzeAction
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+   <ArchiveAction
+      buildConfiguration = "Release"
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+</Scheme>

Masonry/MASCompositeConstraint.h

@@ -0,0 +1,26 @@
+//
+//  MASCompositeConstraint.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "MASConstraint.h"
+
+typedef NS_ENUM(NSInteger, MASCompositeViewConstraintType) {
+    MASCompositeViewConstraintTypeSides,
+    MASCompositeViewConstraintTypeSize,
+    MASCompositeViewConstraintTypeCenter,
+};
+
+@interface MASCompositeConstraint : NSObject <MASConstraint>
+
+@property (nonatomic, weak) id<MASConstraintDelegate> delegate;
+@property (nonatomic, strong, readonly) UIView *view;
+@property (nonatomic, assign, readonly) MASCompositeViewConstraintType type;
+
+- (id)initWithView:(UIView *)view type:(MASCompositeViewConstraintType)type;
+
+@end

Masonry/MASCompositeConstraint.m

@@ -0,0 +1,177 @@
+//
+//  MASCompositeConstraint.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASCompositeConstraint.h"
+#import "UIView+MASAdditions.h"
+#import "MASViewConstraint.h"
+
+@interface MASCompositeConstraint () <MASConstraintDelegate>
+
+@property (nonatomic, strong) NSMutableArray *completedChildConstraints;
+@property (nonatomic, strong) NSMutableArray *currentChildConstraints;
+
+@end
+
+@implementation MASCompositeConstraint
+
+- (id)initWithView:(UIView *)view type:(MASCompositeViewConstraintType)type {
+    self = [super init];
+    if (!self) return nil;
+    
+    _view = view;
+    _type = type;
+    
+    self.completedChildConstraints = NSMutableArray.array;
+    [self createChildren];
+    
+    return self;
+}
+
+- (void)createChildren {
+    self.currentChildConstraints = NSMutableArray.array;
+    
+    NSArray *viewAttributes;
+    switch (self.type) {
+        case MASCompositeViewConstraintTypeSides:
+            viewAttributes = @[
+                self.view.mas_left, self.view.mas_top,
+                self.view.mas_bottom, self.view.mas_right
+            ];
+            break;
+        case MASCompositeViewConstraintTypeSize:
+            viewAttributes = @[
+                self.view.mas_width, self.view.mas_height
+            ];
+            break;
+        case MASCompositeViewConstraintTypeCenter:
+            viewAttributes = @[
+                self.view.mas_centerX, self.view.mas_centerY
+            ];
+            break;
+    }
+    
+    for (MASViewAttribute *viewAttribute in viewAttributes) {
+        MASViewConstraint *child = [[MASViewConstraint alloc] initWithFirstViewAttribute:viewAttribute];
+        child.delegate = self;
+        [self.currentChildConstraints addObject:child];
+    }
+}
+
+#pragma mark - MASConstraintDelegate
+
+- (void)addConstraint:(id<MASConstraint>)constraint {
+    //TODO fixme
+    if (![self.currentChildConstraints containsObject:constraint]) {
+        [self.currentChildConstraints addObject:constraint];
+    }
+}
+
+#pragma mark - layout constant
+
+- (id<MASConstraint> (^)(UIEdgeInsets))insets {
+    return ^id(UIEdgeInsets insets) {
+        for (id<MASConstraint> constraint in self.currentChildConstraints) {
+            constraint.insets(insets);
+        }
+        return self;
+    };
+}
+
+- (id<MASConstraint> (^)(CGFloat))offset {
+    return ^id(CGFloat offset) {
+        for (id<MASConstraint> constraint in self.currentChildConstraints) {
+            constraint.offset(offset);
+        }
+        return self;
+    };
+}
+
+- (id<MASConstraint> (^)(CGSize))sizeOffset {
+    return ^id(CGSize offset) {
+        for (id<MASConstraint> constraint in self.currentChildConstraints) {
+            constraint.sizeOffset(offset);
+        }
+        return self;
+    };
+}
+
+- (id<MASConstraint> (^)(CGPoint))centerOffset {
+    return ^id(CGPoint offset) {
+        for (id<MASConstraint> constraint in self.currentChildConstraints) {
+            constraint.centerOffset(offset);
+        }
+        return self;
+    };
+}
+
+#pragma mark - layout multiplier
+
+- (id<MASConstraint> (^)(CGFloat))percent {
+    return ^id(CGFloat percent) {
+        for (id<MASConstraint> constraint in self.currentChildConstraints) {
+            constraint.percent(percent);
+        }
+        return self;
+    };
+}
+
+#pragma mark - layout priority
+
+- (id<MASConstraint> (^)(UILayoutPriority))priority {
+    return ^id(UILayoutPriority priority) {
+        for (id<MASConstraint> constraint in self.currentChildConstraints) {
+            constraint.priority(priority);
+        }
+        return self;
+    };
+}
+
+#pragma mark - layout relation
+
+- (id<MASConstraint> (^)(id))equalityWithBlock:(id<MASConstraint> (^)(id<MASConstraint> constraint, id attr))block {
+    return ^id(id attr) {
+        [self.delegate addConstraint:self]; //TODO make sure we dont add more than once
+        for (id<MASConstraint> constraint in self.currentChildConstraints.copy) {
+            //TODO fixme
+            id<MASConstraint> newConstraint = block(constraint, attr);
+            //if (newConstraint != constraint) { //TODO fix
+                //[self.currentChildConstraints removeObject:constraint];
+                [self.completedChildConstraints addObject:newConstraint];
+            //}
+        }
+        return self;
+    };
+}
+
+- (id<MASConstraint> (^)(id))equal {
+    return [self equalityWithBlock:^id(id<MASConstraint> constraint, id attr) {
+        return constraint.equal(attr);
+    }];
+}
+
+- (id<MASConstraint> (^)(id))greaterThanOrEqual {
+    return [self equalityWithBlock:^id<MASConstraint>(id<MASConstraint> constraint, id attr) {
+        return constraint.greaterThanOrEqual(attr);
+    }];
+}
+
+- (id<MASConstraint> (^)(id))lessThanOrEqual {
+    return [self equalityWithBlock:^id<MASConstraint>(id<MASConstraint> constraint, id attr) {
+        return constraint.lessThanOrEqual(attr);
+    }];
+}
+
+#pragma mark - MASConstraint
+
+- (void)commit {
+    for (id<MASConstraint> constraint in self.completedChildConstraints) {
+        [constraint commit];
+    }
+}
+
+@end

Masonry/MASConstraint.h

@@ -0,0 +1,31 @@
+//
+//  MASConstraint.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 22/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@protocol MASConstraint <NSObject>
+
+@property (nonatomic, strong, readonly) id<MASConstraint> (^insets)(UIEdgeInsets insets);
+@property (nonatomic, strong, readonly) id<MASConstraint> (^sizeOffset)(CGSize offset);
+@property (nonatomic, strong, readonly) id<MASConstraint> (^centerOffset)(CGPoint offset);
+@property (nonatomic, strong, readonly) id<MASConstraint> (^offset)(CGFloat offset);
+@property (nonatomic, strong, readonly) id<MASConstraint> (^percent)(CGFloat percent);
+@property (nonatomic, strong, readonly) id<MASConstraint> (^priority)(UILayoutPriority priority);
+@property (nonatomic, strong, readonly) id<MASConstraint> (^equal)(id attr);
+@property (nonatomic, strong, readonly) id<MASConstraint> (^greaterThanOrEqual)(id attr);
+@property (nonatomic, strong, readonly) id<MASConstraint> (^lessThanOrEqual)(id attr);
+
+- (void)commit;
+
+@end
+
+@protocol MASConstraintDelegate <NSObject>
+
+- (void)addConstraint:(id<MASConstraint>)constraint;
+
+@end

Masonry/MASConstraintBuilder.h

@@ -0,0 +1,33 @@
+//
+//  MASConstraintBuilder.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "MASConstraint.h"
+
+@interface MASConstraintBuilder : NSObject
+
+@property (nonatomic, strong, readonly) id<MASConstraint> left;
+@property (nonatomic, strong, readonly) id<MASConstraint> top;
+@property (nonatomic, strong, readonly) id<MASConstraint> right;
+@property (nonatomic, strong, readonly) id<MASConstraint> bottom;
+@property (nonatomic, strong, readonly) id<MASConstraint> leading;
+@property (nonatomic, strong, readonly) id<MASConstraint> trailing;
+@property (nonatomic, strong, readonly) id<MASConstraint> width;
+@property (nonatomic, strong, readonly) id<MASConstraint> height;
+@property (nonatomic, strong, readonly) id<MASConstraint> centerX;
+@property (nonatomic, strong, readonly) id<MASConstraint> centerY;
+@property (nonatomic, strong, readonly) id<MASConstraint> baseline;
+
+@property (nonatomic, strong, readonly) id<MASConstraint> sides;
+@property (nonatomic, strong, readonly) id<MASConstraint> size;
+@property (nonatomic, strong, readonly) id<MASConstraint> center;
+
+- (id)initWithView:(UIView *)view;
+- (void)commit;
+
+@end

Masonry/MASConstraintBuilder.m

@@ -0,0 +1,121 @@
+//
+//  MASConstraintBuilder.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASConstraintBuilder.h"
+#import "MASViewConstraint.h"
+#import "MASCompositeConstraint.h"
+#import "MASViewAttribute.h"
+
+@interface MASConstraintBuilder () <MASConstraintDelegate>
+
+@property (nonatomic, strong) UIView *view;
+@property (nonatomic, strong) NSMutableArray *constraints;
+
+@end
+
+@implementation MASConstraintBuilder
+
+- (id)initWithView:(UIView *)view {
+    self = [super init];
+    if (!self) return nil;
+    
+    self.view = view;
+    self.constraints = NSMutableArray.new;
+    
+    return self;
+}
+
+- (void)commit {
+    for (id<MASConstraint> constraint in self.constraints) {
+        [constraint commit];
+    }
+    [self.constraints removeAllObjects];
+}
+
+#pragma mark - MASConstraintDelegate
+
+- (void)addConstraint:(id<MASConstraint>)constraint {
+    [self.constraints addObject:constraint];
+}
+
+#pragma mark - constraint properties
+
+- (id<MASConstraint>)constraintWithLayoutAttribute:(NSLayoutAttribute)layoutAttribute {
+    MASViewAttribute *viewAttribute = [[MASViewAttribute alloc] initWithView:self.view layoutAttribute:layoutAttribute];
+    MASViewConstraint *constraint = [[MASViewConstraint alloc] initWithFirstViewAttribute:viewAttribute];
+    constraint.delegate = self;
+    return constraint;
+}
+
+#pragma mark - standard Attributes
+
+- (id<MASConstraint>)left {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeLeft];
+}
+
+- (id<MASConstraint>)top {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeTop];
+}
+
+- (id<MASConstraint>)right {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeRight];
+}
+
+- (id<MASConstraint>)bottom {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeBottom];
+}
+
+- (id<MASConstraint>)leading {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeLeading];
+}
+
+- (id<MASConstraint>)trailing {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeTrailing];
+}
+
+- (id<MASConstraint>)width {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeWidth];
+}
+
+- (id<MASConstraint>)height {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeHeight];
+}
+
+- (id<MASConstraint>)centerX {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeCenterX];
+}
+
+- (id<MASConstraint>)centerY {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeCenterY];
+}
+
+- (id<MASConstraint>)baseline {
+    return [self constraintWithLayoutAttribute:NSLayoutAttributeBaseline];
+}
+
+
+#pragma mark - composite Attributes
+
+- (id<MASConstraint>)sides {
+    MASCompositeConstraint *constraint = [[MASCompositeConstraint alloc] initWithView:self.view type:MASCompositeViewConstraintTypeSides];
+    constraint.delegate = self;
+    return constraint;
+}
+
+- (id<MASConstraint>)size {
+    MASCompositeConstraint *constraint = [[MASCompositeConstraint alloc] initWithView:self.view type:MASCompositeViewConstraintTypeSize];
+    constraint.delegate = self;
+    return constraint;
+}
+
+- (id<MASConstraint>)center {
+    MASCompositeConstraint *constraint = [[MASCompositeConstraint alloc] initWithView:self.view type:MASCompositeViewConstraintTypeCenter];
+    constraint.delegate = self;
+    return constraint;
+}
+@end

Masonry/MASViewAttribute.h

@@ -0,0 +1,20 @@
+//
+//  MASAttribute.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface MASViewAttribute : NSObject
+
+@property (nonatomic, strong, readonly) UIView *view;
+@property (nonatomic, assign, readonly) NSLayoutAttribute layoutAttribute;
+
+- (id)initWithView:(UIView *)view layoutAttribute:(NSLayoutAttribute)layoutAttribute;
+
+- (BOOL)isAlignment;
+
+@end

Masonry/MASViewAttribute.m

@@ -0,0 +1,27 @@
+//
+//  MASAttribute.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASViewAttribute.h"
+
+@implementation MASViewAttribute
+
+- (id)initWithView:(UIView *)view layoutAttribute:(NSLayoutAttribute)layoutAttribute {
+    self = [super init];
+    if (!self) return nil;
+    
+    _view = view;
+    _layoutAttribute = layoutAttribute;
+    
+    return self;
+}
+
+- (BOOL)isAlignment {
+    return self.layoutAttribute != NSLayoutAttributeWidth && self.layoutAttribute != NSLayoutAttributeHeight;
+}
+
+@end

Masonry/MASViewConstraint.h

@@ -0,0 +1,20 @@
+//
+//  MASConstraint.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASViewAttribute.h"
+#import "MASConstraint.h"
+
+@interface MASViewConstraint : NSObject <MASConstraint>
+
+@property (nonatomic, weak) id<MASConstraintDelegate> delegate;
+@property (nonatomic, strong, readonly) MASViewAttribute *firstViewAttribute;
+@property (nonatomic, strong, readonly) MASViewAttribute *secondViewAttribute;
+
+- (id)initWithFirstViewAttribute:(MASViewAttribute *)firstViewAttribute;
+
+@end

Masonry/MASViewConstraint.m

@@ -0,0 +1,259 @@
+//
+//  MASConstraint.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASViewConstraint.h"
+
+@interface MASViewConstraint ()
+
+@property (nonatomic, strong, readwrite) MASViewAttribute *secondViewAttribute;
+@property (nonatomic, strong) NSLayoutConstraint *layoutConstraint;
+@property (nonatomic, assign) NSLayoutRelation layoutRelation;
+@property (nonatomic, assign) UILayoutPriority layoutPriority;
+@property (nonatomic, assign) CGFloat layoutMultiplier;
+@property (nonatomic, assign) CGFloat layoutConstant;
+@property (nonatomic, assign) BOOL hasLayoutRelation;
+
+@end
+
+@implementation MASViewConstraint
+
+- (id)initWithFirstViewAttribute:(MASViewAttribute *)firstViewAttribute {
+    self = [super init];
+    if (!self) return nil;
+    
+    _firstViewAttribute = firstViewAttribute;
+    self.layoutPriority = UILayoutPriorityRequired;
+    self.layoutMultiplier = 1;
+    
+    return self;
+}
+
+#pragma mark - private
+
+- (void)setLayoutConstant:(CGFloat)layoutConstant {
+    _layoutConstant = layoutConstant;
+    self.layoutConstraint.constant = layoutConstant;
+}
+
+- (void)setLayoutRelation:(NSLayoutRelation)layoutRelation {
+    _layoutRelation = layoutRelation;
+    self.hasLayoutRelation = YES;
+}
+
+- (BOOL)hasBeenCommitted {
+    return self.layoutConstraint != nil;
+}
+
+- (instancetype)cloneIfNeeded {
+    if (self.hasLayoutRelation) {
+        MASViewAttribute *firstViewAttribute = [[MASViewAttribute alloc] initWithView:self.firstViewAttribute.view layoutAttribute:self.firstViewAttribute.layoutAttribute];
+        
+        MASViewConstraint *viewConstraint = [[MASViewConstraint alloc] initWithFirstViewAttribute:firstViewAttribute];
+        viewConstraint.delegate = self.delegate;
+        viewConstraint.layoutRelation = self.layoutRelation;
+        return viewConstraint;
+    }
+    return self;
+}
+
+#pragma mark - layout constant
+
+- (id<MASConstraint> (^)(UIEdgeInsets))insets {
+    return ^id(UIEdgeInsets insets){
+        NSLayoutAttribute layoutAttribute = self.firstViewAttribute.layoutAttribute;
+        switch (layoutAttribute) {
+            case NSLayoutAttributeLeft:
+                self.layoutConstant = insets.left;
+                break;
+            case NSLayoutAttributeTop:
+                self.layoutConstant = insets.top;
+                break;
+            case NSLayoutAttributeBottom:
+                self.layoutConstant = -insets.bottom;
+                break;
+            case NSLayoutAttributeRight:
+                self.layoutConstant = -insets.right;
+                break;
+            default:
+                break;
+        }
+        return self;
+    };
+}
+
+- (id<MASConstraint> (^)(CGSize))sizeOffset {
+    return ^id(CGSize offset) {
+        NSLayoutAttribute layoutAttribute = self.firstViewAttribute.layoutAttribute;
+        switch (layoutAttribute) {
+            case NSLayoutAttributeWidth:
+                self.layoutConstant = offset.width;
+                break;
+            case NSLayoutAttributeHeight:
+                self.layoutConstant = offset.height;
+                break;
+            default:
+                break;
+        }
+        return self;
+    };
+}
+
+- (id<MASConstraint> (^)(CGPoint))centerOffset {
+    return ^id(CGPoint offset) {
+        NSLayoutAttribute layoutAttribute = self.firstViewAttribute.layoutAttribute;
+        switch (layoutAttribute) {
+            case NSLayoutAttributeCenterX:
+                self.layoutConstant = offset.x;
+                break;
+            case NSLayoutAttributeCenterY:
+                self.layoutConstant = offset.y;
+                break;
+            default:
+                break;
+        }
+        return self;
+    };
+}
+
+- (id<MASConstraint> (^)(CGFloat))offset {
+    return ^id(CGFloat offset){
+        self.layoutConstant = offset;
+        return self;
+    };
+}
+
+#pragma mark - layout multiplier
+
+- (id<MASConstraint> (^)(CGFloat))percent {
+    return ^id(CGFloat percent) {
+        NSAssert(!self.hasBeenCommitted,
+                 @"Cannot modify constraint percent after it has been committed");
+        
+        self.layoutMultiplier = percent;
+        return self;
+    };
+}
+
+#pragma mark - layout priority
+
+- (id<MASConstraint> (^)(UILayoutPriority))priority {
+    return ^id(UILayoutPriority priority) {
+        NSAssert(!self.hasBeenCommitted,
+                 @"Cannot modify constraint priority after it has been committed");
+        
+        self.layoutPriority = priority;
+        return self;
+    };
+}
+
+#pragma mark - layout relation
+
+- (void)setSecondViewAttribute:(id)secondViewAttribute {
+    if ([secondViewAttribute isKindOfClass:NSNumber.class]) {
+        self.layoutConstant = [secondViewAttribute doubleValue];
+    } else if ([secondViewAttribute isKindOfClass:NSArray.class]) {
+        //TODO Composite
+    } else if ([secondViewAttribute isKindOfClass:UIView.class]) {
+        _secondViewAttribute = [[MASViewAttribute alloc] initWithView:secondViewAttribute layoutAttribute:self.firstViewAttribute.layoutAttribute];
+    } else if ([secondViewAttribute isKindOfClass:MASViewAttribute.class]) {
+        _secondViewAttribute = secondViewAttribute;
+    } else {
+        NSAssert(YES, @"attempting to add unsupported attribute: %@", secondViewAttribute);
+    }
+    [self.delegate addConstraint:self];
+}
+
+- (id<MASConstraint> (^)(id))equal {
+    return ^id(id attr) {
+        NSAssert(!self.hasBeenCommitted,
+                 @"Cannot modify constraint equal relation after it has been committed");
+        
+        MASViewConstraint *viewConstraint = [self cloneIfNeeded];
+        viewConstraint.layoutRelation = NSLayoutRelationEqual;
+        viewConstraint.secondViewAttribute = attr;
+        return viewConstraint;
+    };
+}
+
+- (id<MASConstraint> (^)(id))greaterThanOrEqual {
+    return ^id(id attr) {
+        NSAssert(!self.hasBeenCommitted,
+                 @"Cannot modify constraint greaterThanOrEqual relation after it has been committed");
+        
+        MASViewConstraint *viewConstraint = [self cloneIfNeeded];
+        viewConstraint.layoutRelation = NSLayoutRelationGreaterThanOrEqual;
+        viewConstraint.secondViewAttribute = attr;
+        return viewConstraint;
+    };
+}
+
+- (id<MASConstraint> (^)(id))lessThanOrEqual {
+    return ^id(id attr) {
+        NSAssert(!self.hasBeenCommitted,
+                 @"Cannot modify constraint lessThanOrEqual relation after it has been committed");
+        
+        MASViewConstraint *viewConstraint = [self cloneIfNeeded];
+        viewConstraint.layoutRelation = NSLayoutRelationLessThanOrEqual;
+        viewConstraint.secondViewAttribute = attr;
+        return viewConstraint;
+    };
+}
+
+#pragma mark - MASConstraint
+
+- (void)commit {
+    NSAssert(!self.hasBeenCommitted, @"Cannot commit constraint more than once");
+    
+    UIView *firstLayoutItem = self.firstViewAttribute.view;
+    NSLayoutAttribute firstLayoutAttribute = self.firstViewAttribute.layoutAttribute;
+    UIView *secondLayoutItem = self.secondViewAttribute.view;
+    NSLayoutAttribute secondLayoutAttribute = self.secondViewAttribute.layoutAttribute;
+    if (self.firstViewAttribute.isAlignment && !self.secondViewAttribute) {
+        secondLayoutItem = firstLayoutItem.superview;
+        secondLayoutAttribute = firstLayoutAttribute;
+    }
+    
+    
+    self.layoutConstraint = [NSLayoutConstraint constraintWithItem:firstLayoutItem
+                                                         attribute:firstLayoutAttribute
+                                                         relatedBy:self.layoutRelation
+                                                            toItem:secondLayoutItem
+                                                         attribute:secondLayoutAttribute
+                                                        multiplier:self.layoutMultiplier
+                                                          constant:self.layoutConstant];
+    
+    self.layoutConstraint.priority = self.layoutPriority;
+    
+    if (secondLayoutItem) {
+        UIView *closestCommonSuperview = nil;
+        
+        UIView *secondViewSuperview = secondLayoutItem;
+        while (!closestCommonSuperview && secondViewSuperview) {
+            UIView *firstViewSuperview = firstLayoutItem;
+            while (!closestCommonSuperview && firstViewSuperview) {
+                if (secondViewSuperview == firstViewSuperview) {
+                    closestCommonSuperview = secondViewSuperview;
+                }
+                firstViewSuperview = firstViewSuperview.superview;
+            }
+            secondViewSuperview = secondViewSuperview.superview;
+        }
+        NSAssert(closestCommonSuperview,
+                 @"couldn't find a common superview for %@ and %@",
+                 firstLayoutItem,
+                 secondLayoutItem);
+        [closestCommonSuperview addConstraint:self.layoutConstraint];
+    } else {
+        
+        [firstLayoutItem addConstraint:self.layoutConstraint];
+    }
+    
+    
+}
+
+@end

Masonry/Masonry-Prefix.pch

@@ -0,0 +1,14 @@
+//
+// Prefix header for all source files of the 'Masonry' target in the 'Masonry' project
+//
+
+#import <Availability.h>
+
+#ifndef __IPHONE_6_0
+#warning "This project uses features only available in iOS SDK 6.0 and later."
+#endif
+
+#ifdef __OBJC__
+    #import <UIKit/UIKit.h>
+    #import <Foundation/Foundation.h>
+#endif

Masonry/Masonry.h

@@ -0,0 +1,11 @@
+//
+//  Masonry.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "UIView+MASAdditions.h"
+#import "MASViewConstraint.h"
+#import "MASConstraintBuilder.h"

Masonry/UIView+MASAdditions.h

@@ -0,0 +1,52 @@
+//
+//  UIView+MASAdditions.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "MASConstraintBuilder.h"
+#import "MASViewAttribute.h"
+
+
+@interface UIView (MASAdditions)
+
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_left;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_top;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_right;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_bottom;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_leading;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_trailing;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_width;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_height;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_centerX;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_centerY;
+@property (nonatomic, strong, readonly) MASViewAttribute *mas_baseline;
+
+- (void)mas_buildConstraints:(void(^)(MASConstraintBuilder *constraints))block;
+
+@end
+
+#ifdef MAS_SHORTHAND
+
+@interface UIView (MASShortHandAdditions)
+
+@property (nonatomic, strong, readonly) MASViewAttribute *left;
+@property (nonatomic, strong, readonly) MASViewAttribute *top;
+@property (nonatomic, strong, readonly) MASViewAttribute *right;
+@property (nonatomic, strong, readonly) MASViewAttribute *bottom;
+@property (nonatomic, strong, readonly) MASViewAttribute *leading;
+@property (nonatomic, strong, readonly) MASViewAttribute *trailing;
+@property (nonatomic, strong, readonly) MASViewAttribute *width;
+@property (nonatomic, strong, readonly) MASViewAttribute *height;
+@property (nonatomic, strong, readonly) MASViewAttribute *centerX;
+@property (nonatomic, strong, readonly) MASViewAttribute *centerY;
+@property (nonatomic, strong, readonly) MASViewAttribute *baseline;
+
+- (void)buildConstraints:(void(^)(MASConstraintBuilder *constraints))block;
+
+@end
+
+#endif

Masonry/UIView+MASAdditions.m

@@ -0,0 +1,91 @@
+//
+//  UIView+MASAdditions.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "UIView+MASAdditions.h"
+
+@implementation UIView (MASAdditions)
+
+- (void)mas_buildConstraints:(void(^)(MASConstraintBuilder *constraints))block {
+    self.translatesAutoresizingMaskIntoConstraints = NO;
+    MASConstraintBuilder *viewConstraintBuilder = [[MASConstraintBuilder alloc] initWithView:self];
+    block(viewConstraintBuilder);
+    [viewConstraintBuilder commit];
+}
+
+#pragma mark - attribute properties
+
+- (MASViewAttribute *)mas_left {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeLeft];
+}
+
+- (MASViewAttribute *)mas_top {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeTop];
+}
+
+- (MASViewAttribute *)mas_right {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeRight];
+}
+
+- (MASViewAttribute *)mas_bottom {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeBottom];
+}
+
+- (MASViewAttribute *)mas_leading {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeLeading];
+}
+
+- (MASViewAttribute *)mas_trailing {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeTrailing];
+}
+
+- (MASViewAttribute *)mas_width {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeWidth];
+}
+
+- (MASViewAttribute *)mas_height {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeHeight];
+}
+
+- (MASViewAttribute *)mas_centerX {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeCenterX];
+}
+
+- (MASViewAttribute *)mas_centerY {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeCenterY];
+}
+
+- (MASViewAttribute *)mas_baseline {
+    return [[MASViewAttribute alloc] initWithView:self layoutAttribute:NSLayoutAttributeBaseline];
+}
+
+@end
+
+#define MAS_ATTR_FORWARD(attr)  \
+- (MASViewAttribute *)attr {    \
+    return [self mas_##attr];   \
+}
+
+@implementation UIView (MASShortHandAdditions)
+
+MAS_ATTR_FORWARD(top);
+MAS_ATTR_FORWARD(left);
+MAS_ATTR_FORWARD(bottom);
+MAS_ATTR_FORWARD(right);
+MAS_ATTR_FORWARD(leading);
+MAS_ATTR_FORWARD(trailing);
+MAS_ATTR_FORWARD(width);
+MAS_ATTR_FORWARD(height);
+MAS_ATTR_FORWARD(centerX);
+MAS_ATTR_FORWARD(centerY);
+MAS_ATTR_FORWARD(baseline);
+
+- (void)buildConstraints:(void(^)(MASConstraintBuilder *constraints))block {
+    [self mas_buildConstraints:block];
+}
+
+@end

MasonryExamples/MasonryExamples.xcodeproj/project.pbxproj

@@ -0,0 +1,347 @@
+// !$*UTF8*$!
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+				DD52F22F179CAD57005CD195 /* CoreGraphics.framework in Frameworks */,
+			);
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+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		DD52F21E179CAD57005CD195 = {
+			isa = PBXGroup;
+			children = (
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+				DD52F229179CAD57005CD195 /* Frameworks */,
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+		};
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+			isa = PBXGroup;
+			children = (
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+			);
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+			);
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+			sourceTree = "<group>";
+		};
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+			isa = PBXGroup;
+			children = (
+				DD52F239179CAD57005CD195 /* MASAppDelegate.h */,
+				DD52F23A179CAD57005CD195 /* MASAppDelegate.m */,
+				DD52F257179CADCB005CD195 /* Controllers */,
+				DD52F256179CADC4005CD195 /* Views */,
+				DD52F231179CAD57005CD195 /* Supporting Files */,
+			);
+			path = MasonryExamples;
+			sourceTree = "<group>";
+		};
+		DD52F231179CAD57005CD195 /* Supporting Files */ = {
+			isa = PBXGroup;
+			children = (
+				DD52F232179CAD57005CD195 /* MasonryExamples-Info.plist */,
+				DD52F233179CAD57005CD195 /* InfoPlist.strings */,
+				DD52F236179CAD57005CD195 /* main.m */,
+				DD52F238179CAD57005CD195 /* MasonryExamples-Prefix.pch */,
+			);
+			name = "Supporting Files";
+			sourceTree = "<group>";
+		};
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+			isa = PBXGroup;
+			children = (
+				DD52F247179CADC0005CD195 /* MASExampleBasicView.h */,
+				DD52F248179CADC0005CD195 /* MASExampleBasicView.m */,
+				DD52F249179CADC0005CD195 /* MASExampleConstantsView.h */,
+				DD52F24A179CADC0005CD195 /* MASExampleConstantsView.m */,
+				DD52F24D179CADC0005CD195 /* MASExampleSidesView.h */,
+				DD52F24E179CADC0005CD195 /* MASExampleSidesView.m */,
+			);
+			name = Views;
+			sourceTree = "<group>";
+		};
+		DD52F257179CADCB005CD195 /* Controllers */ = {
+			isa = PBXGroup;
+			children = (
+				DD52F24B179CADC0005CD195 /* MASExampleListViewController.h */,
+				DD52F24C179CADC0005CD195 /* MASExampleListViewController.m */,
+				DD52F24F179CADC0005CD195 /* MASExampleViewController.h */,
+				DD52F250179CADC0005CD195 /* MASExampleViewController.m */,
+			);
+			name = Controllers;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		DD52F226179CAD57005CD195 /* MasonryExamples */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = DD52F244179CAD57005CD195 /* Build configuration list for PBXNativeTarget "MasonryExamples" */;
+			buildPhases = (
+				DD52F223179CAD57005CD195 /* Sources */,
+				DD52F224179CAD57005CD195 /* Frameworks */,
+				DD52F225179CAD57005CD195 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = MasonryExamples;
+			productName = MasonryExamples;
+			productReference = DD52F227179CAD57005CD195 /* MasonryExamples.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		DD52F21F179CAD57005CD195 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				CLASSPREFIX = MAS;
+				LastUpgradeCheck = 0460;
+				ORGANIZATIONNAME = "Jonas Budelmann";
+			};
+			buildConfigurationList = DD52F222179CAD57005CD195 /* Build configuration list for PBXProject "MasonryExamples" */;
+			compatibilityVersion = "Xcode 3.2";
+			developmentRegion = English;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+			);
+			mainGroup = DD52F21E179CAD57005CD195;
+			productRefGroup = DD52F228179CAD57005CD195 /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				DD52F226179CAD57005CD195 /* MasonryExamples */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		DD52F225179CAD57005CD195 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				DD52F235179CAD57005CD195 /* InfoPlist.strings in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		DD52F223179CAD57005CD195 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				DD52F237179CAD57005CD195 /* main.m in Sources */,
+				DD52F23B179CAD57005CD195 /* MASAppDelegate.m in Sources */,
+				DD52F251179CADC0005CD195 /* MASExampleBasicView.m in Sources */,
+				DD52F252179CADC0005CD195 /* MASExampleConstantsView.m in Sources */,
+				DD52F253179CADC0005CD195 /* MASExampleListViewController.m in Sources */,
+				DD52F254179CADC0005CD195 /* MASExampleSidesView.m in Sources */,
+				DD52F255179CADC0005CD195 /* MASExampleViewController.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXVariantGroup section */
+		DD52F233179CAD57005CD195 /* InfoPlist.strings */ = {
+			isa = PBXVariantGroup;
+			children = (
+				DD52F234179CAD57005CD195 /* en */,
+			);
+			name = InfoPlist.strings;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		DD52F242179CAD57005CD195 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 6.1;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		DD52F243179CAD57005CD195 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 6.1;
+				OTHER_CFLAGS = "-DNS_BLOCK_ASSERTIONS=1";
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		DD52F245179CAD57005CD195 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				GCC_PRECOMPILE_PREFIX_HEADER = YES;
+				GCC_PREFIX_HEADER = "MasonryExamples/MasonryExamples-Prefix.pch";
+				INFOPLIST_FILE = "MasonryExamples/MasonryExamples-Info.plist";
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"\"$(SRCROOT)/../../../Library/Developer/Xcode/DerivedData/Masonry-fbkxraflfpslgmcoluezbqgkgcsz/Build/Products/Debug-iphoneos\"",
+				);
+				OTHER_LDFLAGS = (
+					"-ObjC",
+					"-all_load",
+				);
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				USER_HEADER_SEARCH_PATHS = "$(BUILT_PRODUCTS_DIR)/**";
+				WRAPPER_EXTENSION = app;
+			};
+			name = Debug;
+		};
+		DD52F246179CAD57005CD195 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				GCC_PRECOMPILE_PREFIX_HEADER = YES;
+				GCC_PREFIX_HEADER = "MasonryExamples/MasonryExamples-Prefix.pch";
+				INFOPLIST_FILE = "MasonryExamples/MasonryExamples-Info.plist";
+				LIBRARY_SEARCH_PATHS = (
+					"$(inherited)",
+					"\"$(SRCROOT)/../../../Library/Developer/Xcode/DerivedData/Masonry-fbkxraflfpslgmcoluezbqgkgcsz/Build/Products/Debug-iphoneos\"",
+				);
+				OTHER_LDFLAGS = (
+					"-ObjC",
+					"-all_load",
+				);
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				USER_HEADER_SEARCH_PATHS = "$(BUILT_PRODUCTS_DIR)/**";
+				WRAPPER_EXTENSION = app;
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		DD52F222179CAD57005CD195 /* Build configuration list for PBXProject "MasonryExamples" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				DD52F242179CAD57005CD195 /* Debug */,
+				DD52F243179CAD57005CD195 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		DD52F244179CAD57005CD195 /* Build configuration list for PBXNativeTarget "MasonryExamples" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				DD52F245179CAD57005CD195 /* Debug */,
+				DD52F246179CAD57005CD195 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = DD52F21F179CAD57005CD195 /* Project object */;
+}

MasonryExamples/MasonryExamples.xcodeproj/xcshareddata/xcschemes/MasonryExamples.xcscheme

@@ -0,0 +1,100 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0460"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DD52F1A9179CA93B005CD195"
+               BuildableName = "libMasonry.a"
+               BlueprintName = "Masonry"
+               ReferencedContainer = "container:../Masonry.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DD52F226179CAD57005CD195"
+               BuildableName = "MasonryExamples.app"
+               BlueprintName = "MasonryExamples"
+               ReferencedContainer = "container:MasonryExamples.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      buildConfiguration = "Debug">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DD52F226179CAD57005CD195"
+            BuildableName = "MasonryExamples.app"
+            BlueprintName = "MasonryExamples"
+            ReferencedContainer = "container:MasonryExamples.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </TestAction>
+   <LaunchAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Debug"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DD52F226179CAD57005CD195"
+            BuildableName = "MasonryExamples.app"
+            BlueprintName = "MasonryExamples"
+            ReferencedContainer = "container:MasonryExamples.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Release"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DD52F226179CAD57005CD195"
+            BuildableName = "MasonryExamples.app"
+            BlueprintName = "MasonryExamples"
+            ReferencedContainer = "container:MasonryExamples.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

MasonryExamples/MasonryExamples/MASAppDelegate.h

@@ -0,0 +1,15 @@
+//
+//  MASAppDelegate.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface MASAppDelegate : UIResponder <UIApplicationDelegate>
+
+@property (strong, nonatomic) UIWindow *window;
+
+@end

MasonryExamples/MasonryExamples/MASAppDelegate.m

@@ -0,0 +1,25 @@
+//
+//  MASAppDelegate.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASAppDelegate.h"
+#import "MASExampleListViewController.h"
+
+@implementation MASAppDelegate
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
+    // Override point for customization after application launch.
+    self.window.backgroundColor = UIColor.whiteColor;
+    
+    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:MASExampleListViewController.new];
+    self.window.rootViewController = navigationController;
+    [self.window makeKeyAndVisible];
+    return YES;
+}
+
+@end

MasonryExamples/MasonryExamples/MASExampleBasicView.h

@@ -0,0 +1,13 @@
+//
+//  MASExampleBasicView.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface MASExampleBasicView : UIView
+
+@end

MasonryExamples/MasonryExamples/MASExampleBasicView.m

@@ -0,0 +1,78 @@
+//
+//  MASExampleBasicView.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASExampleBasicView.h"
+
+@implementation MASExampleBasicView
+
+- (id)init {
+    self = [super init];
+    if (!self) return nil;
+    
+    UIView *view1 = UIView.new;
+    view1.backgroundColor = UIColor.greenColor;
+    view1.layer.borderColor = UIColor.blackColor.CGColor;
+    view1.layer.borderWidth = 2;
+    [self addSubview:view1];
+    
+    UIView *view2 = UIView.new;
+    view2.backgroundColor = UIColor.redColor;
+    view2.layer.borderColor = UIColor.blackColor.CGColor;
+    view2.layer.borderWidth = 2;
+    [self addSubview:view2];
+    
+    UIView *view3 = UIView.new;
+    view3.backgroundColor = UIColor.blueColor;
+    view3.layer.borderColor = UIColor.blackColor.CGColor;
+    view3.layer.borderWidth = 2;
+    [self addSubview:view3];
+    
+    UIView *superview = self;
+    int padding = 10;
+    
+    [view1 mas_buildConstraints:^(MASConstraintBuilder *constraints) {
+        constraints.top.equal(superview.mas_top).offset(padding);
+        constraints.left.equal(superview.mas_left).offset(padding);
+        constraints.bottom.equal(view3.mas_top).offset(-padding);
+        constraints.right.equal(view2.mas_left).offset(-padding);
+        constraints.width.equal(view2.mas_width);
+        
+        //you can chain same attribute
+        constraints.height
+            .equal(view2.mas_height)
+            .equal(view3.mas_height);
+    }];
+    
+    [view2 mas_buildConstraints:^(MASConstraintBuilder *constraints) {
+        constraints.top.equal(superview.mas_top).offset(padding);
+        constraints.left.equal(view1.mas_right).offset(padding);
+        constraints.bottom.equal(view3.mas_top).offset(-padding);
+        constraints.right.equal(superview.mas_right).offset(-padding);
+        constraints.width.equal(view1.mas_width);
+        
+        //or define it multiple times
+        constraints.height.equal(view1.mas_height);
+        constraints.height.equal(view3.mas_height);
+    }];
+    
+    [view3 mas_buildConstraints:^(MASConstraintBuilder *constraints) {
+        constraints.top.equal(view1.mas_bottom).offset(padding);
+        constraints.left.equal(superview.mas_left).offset(padding);
+        constraints.bottom.equal(superview.mas_bottom).offset(-padding);
+        constraints.right.equal(superview.mas_right).offset(-padding);
+        
+        //TODO or pass an array
+        //constraints.height.equal(superview.subviews);
+        constraints.height.equal(view1.mas_height);
+        constraints.height.equal(view2.mas_height);
+    }];
+    
+    return self;
+}
+
+@end

MasonryExamples/MasonryExamples/MASExampleConstantsView.h

@@ -0,0 +1,13 @@
+//
+//  MASExampleConstantsView.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface MASExampleConstantsView : UIView
+
+@end

MasonryExamples/MasonryExamples/MASExampleConstantsView.m

@@ -0,0 +1,48 @@
+//
+//  MASExampleConstantsView.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASExampleConstantsView.h"
+
+@implementation MASExampleConstantsView
+
+- (id)init {
+    self = [super init];
+    if (!self) return nil;
+    
+    UIView *view1 = UIView.new;
+    view1.backgroundColor = UIColor.purpleColor;
+    view1.layer.borderColor = UIColor.blackColor.CGColor;
+    view1.layer.borderWidth = 2;
+    [self addSubview:view1];
+    
+    UIView *view2 = UIView.new;
+    view2.backgroundColor = UIColor.orangeColor;
+    view2.layer.borderColor = UIColor.blackColor.CGColor;
+    view2.layer.borderWidth = 2;
+    [self addSubview:view2];
+    
+    //example of using constants
+    
+    [view1 mas_buildConstraints:^(MASConstraintBuilder *constraints) {
+        constraints.top.equal(@20);
+        constraints.left.equal(@20);
+        constraints.bottom.equal(@-20);
+        constraints.right.equal(@-20);
+    }];
+    
+    [view2 mas_buildConstraints:^(MASConstraintBuilder *constraints) {
+        constraints.centerY.equal(@50);
+        constraints.centerX.equal(@0);
+        constraints.width.equal(@200);
+        constraints.height.equal(@100);
+    }];
+    
+    return self;
+}
+
+@end

MasonryExamples/MasonryExamples/MASExampleListViewController.h

@@ -0,0 +1,13 @@
+//
+//  MASExampleListViewController.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface MASExampleListViewController : UITableViewController
+
+@end

MasonryExamples/MasonryExamples/MASExampleListViewController.m

@@ -0,0 +1,66 @@
+//
+//  MASExampleListViewController.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASExampleListViewController.h"
+#import "MASExampleViewController.h"
+#import "MASExampleBasicView.h"
+#import "MASExampleConstantsView.h"
+#import "MASExampleSidesView.h"
+
+static NSString * const kMASCellReuseIdentifier = @"kMASCellReuseIdentifier";
+
+@interface MASExampleListViewController ()
+
+@property (nonatomic, strong) NSArray *exampleControllers;
+
+@end
+
+@implementation MASExampleListViewController
+
+- (id)init {
+    self = [super init];
+    if (!self) return nil;
+    
+    self.title = @"Examples";
+    
+    self.exampleControllers = @[
+        [[MASExampleViewController alloc] initWithTitle:@"Basic" viewClass:MASExampleBasicView.class],
+        [[MASExampleViewController alloc] initWithTitle:@"Using Constants" viewClass:MASExampleConstantsView.class],
+        [[MASExampleViewController alloc] initWithTitle:@"Composite sides" viewClass:MASExampleSidesView.class],
+    ];
+    
+    return self;
+}
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    
+    [self.tableView registerClass:UITableViewCell.class forCellReuseIdentifier:kMASCellReuseIdentifier];
+}
+
+#pragma mark - UITableViewDataSource
+
+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
+    UIViewController *viewController = self.exampleControllers[indexPath.row];
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kMASCellReuseIdentifier forIndexPath:indexPath];
+    cell.textLabel.text = viewController.title;
+    return cell;
+}
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
+    return self.exampleControllers.count;
+}
+
+#pragma mark - UITableViewDelegate
+
+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
+    UIViewController *viewController = self.exampleControllers[indexPath.row];
+    [self.navigationController pushViewController:viewController animated:YES];
+}
+
+@end

MasonryExamples/MasonryExamples/MASExampleSidesView.h

@@ -0,0 +1,13 @@
+//
+//  MASExampleSidesView.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface MASExampleSidesView : UIView
+
+@end

MasonryExamples/MasonryExamples/MASExampleSidesView.m

@@ -0,0 +1,42 @@
+//
+//  MASExampleSidesView.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASExampleSidesView.h"
+
+@implementation MASExampleSidesView
+
+- (id)init {
+    self = [super init];
+    if (!self) return nil;
+    
+    UIView *lastView = self;
+    for (int i = 0; i < 10; i++) {
+        UIView *view = UIView.new;
+        view.backgroundColor = [self randomColor];
+        view.layer.borderColor = UIColor.blackColor.CGColor;
+        view.layer.borderWidth = 2;
+        [self addSubview:view];
+        
+        [view mas_buildConstraints:^(MASConstraintBuilder *constraints) {
+            constraints.sides.equal(lastView).insets(UIEdgeInsetsMake(5, 10, 15, 20));
+        }];
+        
+        lastView = view;
+    }
+    
+    return self;
+}
+
+- (UIColor *)randomColor {
+    CGFloat hue = ( arc4random() % 256 / 256.0 );  //  0.0 to 1.0
+    CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from white
+    CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from black
+    return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
+}
+
+@end

MasonryExamples/MasonryExamples/MASExampleViewController.h

@@ -0,0 +1,15 @@
+//
+//  MASExampleOneViewController.h
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface MASExampleViewController : UIViewController
+
+- (id)initWithTitle:(NSString *)title viewClass:(Class)viewClass;
+
+@end

MasonryExamples/MasonryExamples/MASExampleViewController.m

@@ -0,0 +1,34 @@
+//
+//  MASExampleOneViewController.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 20/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASExampleViewController.h"
+#import "MASExampleBasicView.h"
+
+@interface MASExampleViewController ()
+
+@property (nonatomic, strong) Class viewClass;
+
+@end
+
+@implementation MASExampleViewController
+
+- (id)initWithTitle:(NSString *)title viewClass:(Class)viewClass {
+    self = [super init];
+    if (!self) return nil;
+    
+    self.title = title;
+    self.viewClass = viewClass;
+    
+    return self;
+}
+
+- (void)loadView {
+    self.view = self.viewClass.new;
+}
+
+@end

MasonryExamples/MasonryExamples/MasonryExamples-Info.plist

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleDisplayName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.cloudling.${PRODUCT_NAME:rfc1034identifier}</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1.0</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

MasonryExamples/MasonryExamples/MasonryExamples-Prefix.pch

@@ -0,0 +1,18 @@
+//
+// Prefix header for all source files of the 'MasonryExamples' target in the 'MasonryExamples' project
+//
+
+#import <Availability.h>
+
+#ifndef __IPHONE_3_0
+#warning "This project uses features only available in iOS SDK 3.0 and later."
+#endif
+
+#ifdef __OBJC__
+    #import <UIKit/UIKit.h>
+    #import <Foundation/Foundation.h>
+    #import <QuartzCore/QuartzCore.h>
+
+    #define MAS_SHORTHAND
+    #import "Masonry.h"
+#endif

MasonryExamples/MasonryExamples/en.lproj/InfoPlist.strings

@@ -0,0 +1,2 @@
+/* Localized versions of Info.plist keys */
+

MasonryExamples/MasonryExamples/main.m

@@ -0,0 +1,18 @@
+//
+//  main.m
+//  MasonryExamples
+//
+//  Created by Jonas Budelmann on 22/07/13.
+//  Copyright (c) 2013 Jonas Budelmann. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+#import "MASAppDelegate.h"
+
+int main(int argc, char *argv[])
+{
+    @autoreleasepool {
+        return UIApplicationMain(argc, argv, nil, NSStringFromClass([MASAppDelegate class]));
+    }
+}

MasonryTests/MASCompositeConstraintSpec.m

@@ -0,0 +1,59 @@
+//
+//  MASCompositeConstraintSpec.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 22/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASCompositeConstraint.h"
+
+SpecBegin(MASCompositeConstraint)
+
+__block MASCompositeConstraint *composite;
+__block id<MASConstraintDelegate> delegate;
+
+beforeEach(^{
+    delegate = mockProtocol(@protocol(MASConstraintDelegate));
+});
+
+describe(@"commit", ^{
+
+    
+    
+});
+
+describe(@"centering", ^{
+    
+    beforeEach(^{
+        composite = [[MASCompositeConstraint alloc] initWithView:mock(UIView.class) type:MASCompositeViewConstraintTypeCenter];
+        composite.delegate = delegate;
+    });
+    
+    xit(@"should forward to children", ^{});
+    
+});
+
+describe(@"sizing", ^{
+    
+    beforeEach(^{
+        composite = [[MASCompositeConstraint alloc] initWithView:mock(UIView.class) type:MASCompositeViewConstraintTypeCenter];
+        composite.delegate = delegate;
+    });
+    
+    xit(@"should forward to children", ^{});
+    
+});
+
+describe(@"alignment", ^{
+    
+    beforeEach(^{
+        composite = [[MASCompositeConstraint alloc] initWithView:mock(UIView.class) type:MASCompositeViewConstraintTypeCenter];
+        composite.delegate = delegate;
+    });
+    
+    xit(@"should forward to children", ^{});
+    
+});
+
+SpecEnd

MasonryTests/MASViewConstraintSpec.m

@@ -0,0 +1,178 @@
+//
+//  MASViewConstraintSpec.m
+//  Masonry
+//
+//  Created by Jonas Budelmann on 21/07/13.
+//  Copyright (c) 2013 cloudling. All rights reserved.
+//
+
+#import "MASViewConstraint.h"
+#import "MASConstraint.h"
+
+@interface MASViewConstraint ()
+
+@property (nonatomic, strong) NSLayoutConstraint *layoutConstraint;
+@property (nonatomic, assign) NSLayoutRelation layoutRelation;
+@property (nonatomic, assign) UILayoutPriority layoutPriority;
+@property (nonatomic, assign) CGFloat layoutMultiplier;
+@property (nonatomic, assign) CGFloat layoutConstant;
+@property (nonatomic, assign) BOOL hasLayoutRelation;
+
+@end
+
+SpecBegin(MASViewConstraint)
+
+__block UIView *superview;
+__block MASViewConstraint *constraint;
+__block id<MASConstraintDelegate> delegate;
+__block MASViewAttribute *secondViewAttribute;
+
+beforeEach(^{
+    superview = mock(UIView.class);
+    
+    UIView *secondView = mock(UIView.class);
+    [given(secondView.superview) willReturn:superview];
+    secondViewAttribute = [[MASViewAttribute alloc] initWithView:secondView layoutAttribute:NSLayoutAttributeHeight];
+    delegate = mockProtocol(@protocol(MASConstraintDelegate));
+    
+    UIView *firstView = mock(UIView.class);
+    [given(firstView.superview) willReturn:superview];
+    MASViewAttribute *firstViewAttribute = [[MASViewAttribute alloc] initWithView:firstView layoutAttribute:NSLayoutAttributeWidth];
+    constraint = [[MASViewConstraint alloc] initWithFirstViewAttribute:firstViewAttribute];
+    constraint.delegate = delegate;
+});
+
+describe(@"equality chaining", ^{
+    
+    it(@"should return same constraint when encountering equal for first time", ^{
+        MASViewConstraint *newConstraint = constraint.equal(secondViewAttribute);
+        
+        [verify(delegate) addConstraint:(id)constraint];
+        expect(newConstraint).to.beIdenticalTo(constraint);
+        expect(constraint.secondViewAttribute).to.beIdenticalTo(secondViewAttribute);
+        expect(constraint.layoutRelation).to.ex_equal(NSLayoutRelationEqual);
+    });
+    
+    it(@"should start new constraint when encountering equal subsequently", ^{
+        constraint.greaterThanOrEqual(secondViewAttribute);
+        MASViewConstraint *newConstraint = constraint.equal(secondViewAttribute);
+        
+        [verify(delegate) addConstraint:(id)constraint];
+        [verify(delegate) addConstraint:(id)newConstraint];
+        expect(newConstraint).notTo.beIdenticalTo(constraint);
+    });
+    
+    it(@"should return same constraint when encountering greaterThanOrEqual for first time", ^{
+        MASViewConstraint *newConstraint = constraint.greaterThanOrEqual(secondViewAttribute);
+        
+        [verify(delegate) addConstraint:(id)constraint];
+        expect(newConstraint).to.beIdenticalTo(constraint);
+        expect(constraint.secondViewAttribute).to.beIdenticalTo(secondViewAttribute);
+        expect(constraint.layoutRelation).to.ex_equal(NSLayoutRelationGreaterThanOrEqual);
+    });
+    
+    it(@"should start new constraint when encountering greaterThanOrEqual subsequently", ^{
+        constraint.lessThanOrEqual(secondViewAttribute);
+        MASViewConstraint *newConstraint = constraint.greaterThanOrEqual(secondViewAttribute);
+        
+        [verify(delegate) addConstraint:(id)constraint];
+        [verify(delegate) addConstraint:(id)newConstraint];
+        expect(newConstraint).notTo.beIdenticalTo(constraint);
+    });
+    
+    it(@"should return same constraint when encountering lessThanOrEqual for first time", ^{
+        MASViewConstraint *newConstraint = constraint.lessThanOrEqual(secondViewAttribute);
+        
+        [verify(delegate) addConstraint:(id)constraint];
+        expect(newConstraint).to.beIdenticalTo(constraint);
+        expect(constraint.secondViewAttribute).to.beIdenticalTo(secondViewAttribute);
+        expect(constraint.layoutRelation).to.ex_equal(NSLayoutRelationLessThanOrEqual);
+    });
+    
+    it(@"should start new constraint when encountering lessThanOrEqual subsequently", ^{
+        constraint.equal(secondViewAttribute);
+        MASViewConstraint *newConstraint = constraint.lessThanOrEqual(secondViewAttribute);
+        
+        [verify(delegate) addConstraint:(id)constraint];
+        [verify(delegate) addConstraint:(id)newConstraint];
+        expect(newConstraint).notTo.beIdenticalTo(constraint);
+    });
+    
+    it(@"should not allow update of equal once layoutconstraint is created", ^{
+        [constraint commit];
+        
+        expect(^{
+            constraint.equal(secondViewAttribute);
+        }).to.raise(@"NSInternalInconsistencyException");
+    });
+    
+    it(@"should not allow update of lessThanOrEqual once layoutconstraint is created", ^{
+        [constraint commit];
+        
+        expect(^{
+            constraint.lessThanOrEqual(secondViewAttribute);
+        }).to.raise(@"NSInternalInconsistencyException");
+    });
+    
+    it(@"should not allow update of greaterThanOrEqual once layoutconstraint is created", ^{
+        [constraint commit];
+        
+        expect(^{
+            constraint.greaterThanOrEqual(secondViewAttribute);
+        }).to.raise(@"NSInternalInconsistencyException");
+    });
+
+    xit(@"should create composite when passed array of views", ^{
+
+    });
+});
+
+describe(@"multiplier & constant", ^{
+
+    it(@"should not allow update of multiplier after layoutconstraint is created", ^{
+        [constraint commit];
+        
+        expect(^{
+            constraint.percent(0.9);
+        }).to.raise(@"NSInternalInconsistencyException");
+    });
+    
+    it(@"should allow update of constant after layoutconstraint is created", ^{
+        [constraint commit];
+        constraint.offset(10);
+        
+        expect(constraint.layoutConstant).to.ex_equal(10);
+        expect(constraint.layoutConstraint.constant).to.ex_equal(10);
+    });
+    
+    xit(@"should update sides only", ^{});
+    
+    xit(@"should update center only", ^{});
+    
+    xit(@"should update size only", ^{});
+});
+
+describe(@"commit", ^{
+    
+    it(@"should create layout constraint", ^{
+        constraint.equal(secondViewAttribute);
+        constraint.percent(0.5);
+        constraint.offset(10);
+        constraint.priority(345);
+        [constraint commit];
+        
+        expect(constraint.layoutConstraint.firstAttribute).to.ex_equal(NSLayoutAttributeWidth);
+        expect(constraint.layoutConstraint.secondAttribute).to.ex_equal(NSLayoutAttributeHeight);
+        expect(constraint.layoutConstraint.firstItem).to.beIdenticalTo(constraint.firstViewAttribute.view);
+        expect(constraint.layoutConstraint.secondItem).to.beIdenticalTo(constraint.secondViewAttribute.view);
+        expect(constraint.layoutConstraint.relation).to.ex_equal(NSLayoutRelationEqual);
+        expect(constraint.layoutConstraint.constant).to.ex_equal(10);
+        expect(constraint.layoutConstraint.priority).to.ex_equal(345);
+        expect(constraint.layoutConstraint.multiplier).to.ex_equal(0.5);
+        
+        [verify(superview) addConstraint:constraint.layoutConstraint];
+    });
+    
+});
+
+SpecEnd

MasonryTests/MasonryTests-Info.plist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.cloudling.${PRODUCT_NAME:rfc1034identifier}</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>

MasonryTests/MasonryTests-Prefix.pch

@@ -0,0 +1,20 @@
+//
+// Prefix header for all source files of the 'MasonryTests' target in the 'Masonry' project
+//
+
+#ifdef __OBJC__
+    #import <Foundation/Foundation.h>
+
+    #import "Specta.h"
+
+    #define EXP_SHORTHAND
+    #import "Expecta.h"
+    #undef equal
+    #define ex_equal(expected) _equal(EXPObjectify((expected)))
+
+    #define HC_SHORTHAND
+    #import <OCHamcrest/OCHamcrest.h>
+
+    #define MOCKITO_SHORTHAND
+    #import <OCMockito/OCMockito.h>
+#endif

MasonryTests/en.lproj/InfoPlist.strings

@@ -0,0 +1,2 @@
+/* Localized versions of Info.plist keys */
+

Podfile

@@ -0,0 +1,7 @@
+platform :ios, '6.0'
+
+target 'MasonryTests', :exclusive => true do
+    pod 'Specta'
+	pod 'Expecta'
+	pod 'OCMockito'
+end