Debugging.swift
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//
// SnapKit
//
// Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#if os(iOS) || os(tvOS)
import UIKit
#else
import AppKit
#endif
public extension LayoutConstraint {
override public var description: String {
var description = "<"
description += descriptionForObject(self)
if let firstItem = conditionalOptional(from: self.firstItem) {
description += " \(descriptionForObject(firstItem))"
}
if self.firstAttribute != .notAnAttribute {
description += ".\(descriptionForAttribute(self.firstAttribute))"
}
description += " \(descriptionForRelation(self.relation))"
if let secondItem = self.secondItem {
description += " \(descriptionForObject(secondItem))"
}
if self.secondAttribute != .notAnAttribute {
description += ".\(descriptionForAttribute(self.secondAttribute))"
}
if self.multiplier != 1.0 {
description += " * \(self.multiplier)"
}
if self.secondAttribute == .notAnAttribute {
description += " \(self.constant)"
} else {
if self.constant > 0.0 {
description += " + \(self.constant)"
} else if self.constant < 0.0 {
description += " - \(abs(self.constant))"
}
}
if self.priority.rawValue != 1000.0 {
description += " ^\(self.priority)"
}
description += ">"
return description
}
}
private func descriptionForRelation(_ relation: LayoutRelation) -> String {
switch relation {
case .equal: return "=="
case .greaterThanOrEqual: return ">="
case .lessThanOrEqual: return "<="
}
}
private func descriptionForAttribute(_ attribute: LayoutAttribute) -> String {
#if os(iOS) || os(tvOS)
switch attribute {
case .notAnAttribute: return "notAnAttribute"
case .top: return "top"
case .left: return "left"
case .bottom: return "bottom"
case .right: return "right"
case .leading: return "leading"
case .trailing: return "trailing"
case .width: return "width"
case .height: return "height"
case .centerX: return "centerX"
case .centerY: return "centerY"
case .lastBaseline: return "lastBaseline"
case .firstBaseline: return "firstBaseline"
case .topMargin: return "topMargin"
case .leftMargin: return "leftMargin"
case .bottomMargin: return "bottomMargin"
case .rightMargin: return "rightMargin"
case .leadingMargin: return "leadingMargin"
case .trailingMargin: return "trailingMargin"
case .centerXWithinMargins: return "centerXWithinMargins"
case .centerYWithinMargins: return "centerYWithinMargins"
}
#else
switch attribute {
case .notAnAttribute: return "notAnAttribute"
case .top: return "top"
case .left: return "left"
case .bottom: return "bottom"
case .right: return "right"
case .leading: return "leading"
case .trailing: return "trailing"
case .width: return "width"
case .height: return "height"
case .centerX: return "centerX"
case .centerY: return "centerY"
case .lastBaseline: return "lastBaseline"
case .firstBaseline: return "firstBaseline"
}
#endif
}
private func conditionalOptional<T>(from object: Optional<T>) -> Optional<T> {
return object
}
private func conditionalOptional<T>(from object: T) -> Optional<T> {
return Optional.some(object)
}
private func descriptionForObject(_ object: AnyObject) -> String {
let pointerDescription = String(format: "%p", UInt(bitPattern: ObjectIdentifier(object)))
var desc = ""
desc += type(of: object).description()
if let object = object as? ConstraintView {
desc += ":\(object.snp.label() ?? pointerDescription)"
} else if let object = object as? LayoutConstraint {
desc += ":\(object.label ?? pointerDescription)"
} else {
desc += ":\(pointerDescription)"
}
if let object = object as? LayoutConstraint, let file = object.constraint?.sourceLocation.0, let line = object.constraint?.sourceLocation.1 {
desc += "@\((file as NSString).lastPathComponent)#\(line)"
}
desc += ""
return desc
}