[Feature] Create default Styler for attributed string rendering

.gitignore

@@ -1,3 +1,4 @@
+Carthage/
 Pods/
 .build/
 .DS_Store

.travis.yml

@@ -3,9 +3,9 @@ language: objective-c
 before_install:
   - set -o pipefail
   - gem install xcpretty slather -N
-  - xcrun simctl boot "iPhone 7" || echo "(Pre)Launched the simulator."
+  - xcrun simctl boot "iPhone Xs" || echo "(Pre)Launched the simulator."
 script:
-  - travis_retry xcodebuild -project Down.xcodeproj -scheme "Down" -destination "platform=iOS Simulator,name=iPhone 7" -enableCodeCoverage YES ONLY_ACTIVE_ARCH=YES test | xcpretty -c
+  - travis_retry xcodebuild -project Down.xcodeproj -scheme "Down" -destination "platform=iOS Simulator,name=iPhone Xs" -enableCodeCoverage YES ONLY_ACTIVE_ARCH=YES test | xcpretty -c
   - travis_retry xcodebuild -project Down.xcodeproj -scheme "Down" -sdk macosx -destination 'platform=OS X,arch=x86_64' -enableCodeCoverage YES test | xcpretty -c
   - travis_retry xcodebuild -project Down.xcodeproj -scheme "Down" -sdk appletvsimulator -destination 'platform=tvOS Simulator,name=Apple TV' -enableCodeCoverage YES test | xcpretty -c
 after_success:

Cartfile.private

@@ -0,0 +1 @@
+github "pointfreeco/swift-snapshot-testing" ~> 1.5

Cartfile.resolved

@@ -0,0 +1 @@
+github "pointfreeco/swift-snapshot-testing" "1.5.0"

Source/AST/Nodes/BaseNode.swift

@@ -30,6 +30,17 @@ public class BaseNode: Node {
 
         return result
     }()
+
+    public lazy var nestDepth: Int = {
+        var depth = 0
+        var next = cmarkNode.parent
+
+        while let current = next {
+            depth += current.type == cmarkNode.type ? 1 : 0
+            next = current.parent
+        }
+        return depth
+    }()
 
     init(cmarkNode: CMarkNode) {
         self.cmarkNode = cmarkNode

Source/AST/Nodes/BlockQuote.swift

@@ -13,6 +13,7 @@ public class BlockQuote: BaseNode {}
 // MARK: - Debug
 
 extension BlockQuote: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Block Quote"
     }

Source/AST/Nodes/Code.swift

@@ -18,6 +18,7 @@ public class Code: BaseNode {
 // MARK: - Debug
 
 extension Code: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Code - \(literal ?? "nil")"
     }

Source/AST/Nodes/CodeBlock.swift

@@ -31,7 +31,9 @@ public class CodeBlock: BaseNode {
 // MARK: - Debug
 
 extension CodeBlock: CustomDebugStringConvertible {
+
     public var debugDescription: String {
-        return "Code Block - \(literal ?? "nil"), fenceInfo: \(fenceInfo ?? "nil")"
+        let content = (literal ?? "nil").replacingOccurrences(of: "\n", with: "\\n")
+        return "Code Block - fenceInfo: \(fenceInfo ?? "nil"), content: \(content)"
     }
 }

Source/AST/Nodes/CustomBlock.swift

@@ -18,6 +18,7 @@ public class CustomBlock: BaseNode {
 // MARK: - Debug
 
 extension CustomBlock: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Custom Block - \(literal ?? "nil")"
     }

Source/AST/Nodes/CustomInline.swift

@@ -17,6 +17,7 @@ public class CustomInline: BaseNode {
 // MARK: - Debug
 
 extension CustomInline: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Custom Inline - \(literal ?? "nil")"
     }

Source/AST/Nodes/Document.swift

@@ -16,6 +16,7 @@ public class Document: BaseNode {
     }
 
     /// Accepts the given visitor and return its result.
+    @discardableResult
     public func accept<T: Visitor>(_ visitor: T) -> T.Result {
         return visitor.visit(document: self)
     }
@@ -26,6 +27,7 @@ public class Document: BaseNode {
 // MARK: - Debug
 
 extension Document: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Document"
     }

Source/AST/Nodes/Emphasis.swift

@@ -13,6 +13,7 @@ public class Emphasis: BaseNode {}
 // MARK: - Debug
 
 extension Emphasis: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Emphasis"
     }

Source/AST/Nodes/Heading.swift

@@ -17,6 +17,7 @@ public class Heading: BaseNode {
 // MARK: - Debug
 
 extension Heading: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Heading - L\(headingLevel)"
     }

Source/AST/Nodes/HtmlBlock.swift

@@ -18,7 +18,9 @@ public class HtmlBlock: BaseNode {
 // MARK: - Debug
 
 extension HtmlBlock: CustomDebugStringConvertible {
+
     public var debugDescription: String {
-        return "Html Block - \(literal ?? "nil")"
+        let content = (literal ?? "nil").replacingOccurrences(of: "\n", with: "\\n")
+        return "Html Block - content: \(content)"
     }
 }

Source/AST/Nodes/HtmlInline.swift

@@ -18,6 +18,7 @@ public class HtmlInline: BaseNode {
 // MARK: - Debug
 
 extension HtmlInline: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Html Inline - \(literal ?? "nil")"
     }

Source/AST/Nodes/Image.swift

@@ -39,6 +39,7 @@ public class Image: BaseNode {
 // MARK: - Debug
 
 extension Image: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Image - title: \(title ?? "nil"), url: \(url ?? "nil"))"
     }

Source/AST/Nodes/Item.swift

@@ -13,6 +13,7 @@ public class Item: BaseNode {}
 // MARK: - Debug
 
 extension Item: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Item"
     }

Source/AST/Nodes/LineBreak.swift

@@ -13,6 +13,7 @@ public class LineBreak: BaseNode {}
 // MARK: - Debug
 
 extension LineBreak: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Line Break"
     }

Source/AST/Nodes/Link.swift

@@ -39,6 +39,7 @@ public class Link: BaseNode {
 // MARK: - Debug
 
 extension Link: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Link - title: \(title ?? "nil"), url: \(url ?? "nil"))"
     }

Source/AST/Nodes/List.swift

@@ -9,18 +9,36 @@ import Foundation
 import libcmark
 
 public class List: BaseNode {
+
+    /// The type of the list, either bullet or ordered.
+    public lazy var listType: ListType = {
+        guard let type = ListType(cmarkNode: cmarkNode) else {
+            assertionFailure("Unsupported or missing list type. Defaulting to .bullet.")
+            return .bullet
+        }
+
+        return type
+    }()
 
-    public enum ListType: CustomDebugStringConvertible {
+    /// The number of items in the list.
+    public lazy var numberOfItems: Int = children.count
+}
+
+// MARK: - List Type
+
+public extension List {
+
+    enum ListType: CustomDebugStringConvertible {
         case bullet
         case ordered(start: Int)
-        
+
         public var debugDescription: String {
             switch self {
             case .bullet: return "Bullet"
-            case .ordered(let start): return "Ordered (start: \(start)"
+            case .ordered(let start): return "Ordered (start: \(start))"
             }
         }
-        
+
         init?(cmarkNode: CMarkNode) {
             switch cmarkNode.listType {
             case CMARK_BULLET_LIST: self = .bullet
@@ -29,28 +47,12 @@ public class List: BaseNode {
             }
         }
     }
-
-    ///////////////////////////////////////////////////////////////////////////
-
-    /// The type of the list, either bullet or ordered.
-    public lazy var listType: ListType = {
-        guard let type = ListType(cmarkNode: cmarkNode) else {
-            assertionFailure("Unsupported or missing list type. Defaulting to .bullet.")
-            return .bullet
-        }
-
-        return type
-    }()
-
-    /// The number of items in the list.
-    public lazy var numberOfItems: Int = children.count
-
 }
 
-
 // MARK: - Debug
 
 extension List: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "List - type: \(listType)"
     }

Source/AST/Nodes/Node.swift

@@ -57,7 +57,11 @@ public extension UnsafeMutablePointer where Pointee == cmark_node {
         default:                        return nil
         }
     }
-
+
+    var parent: CMarkNode? {
+        return cmark_node_parent(self)
+    }
+
     var type: cmark_node_type {
         return cmark_node_get_type(self)
     }
@@ -92,6 +96,7 @@ public extension UnsafeMutablePointer where Pointee == cmark_node {
 }
 
 private extension String {
+
     init?(cString: UnsafePointer<Int8>?) {
         guard let unwrapped = cString else { return nil }
         let result = String(cString: unwrapped)

Source/AST/Nodes/Paragraph.swift

@@ -13,6 +13,7 @@ public class Paragraph: BaseNode {}
 // MARK: - Debug
 
 extension Paragraph: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Paragraph"
     }

Source/AST/Nodes/SoftBreak.swift

@@ -13,6 +13,7 @@ public class SoftBreak: BaseNode {}
 // MARK: - Debug
 
 extension SoftBreak: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Soft Break"
     }

Source/AST/Nodes/Strong.swift

@@ -13,6 +13,7 @@ public class Strong: BaseNode {}
 // MARK: - Debug
 
 extension Strong: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Strong"
     }

Source/AST/Nodes/Text.swift

@@ -18,6 +18,7 @@ public class Text: BaseNode {
 // MARK: - Debug
 
 extension Text: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Text - \(literal ?? "nil")"
     }

Source/AST/Nodes/ThematicBreak.swift

@@ -13,6 +13,7 @@ public class ThematicBreak: BaseNode {}
 // MARK: - Debug
 
 extension ThematicBreak: CustomDebugStringConvertible {
+
     public var debugDescription: String {
         return "Thematic Break"
     }

Source/AST/Styling/Attribute Collections/ColorCollection.swift

@@ -0,0 +1,34 @@
+//
+//  ColorCollection.swift
+//  Down
+//
+//  Created by John Nguyen on 27.07.19.
+//  Copyright © 2019 Glazed Donut, LLC. All rights reserved.
+//
+
+#if canImport(UIKit)
+
+import UIKit
+public typealias DownColor = UIColor
+
+#elseif canImport(AppKit)
+
+import AppKit
+public typealias DownColor = NSColor
+
+#endif
+
+public struct ColorCollection {
+
+    public var heading1 = DownColor.black
+    public var heading2 = DownColor.black
+    public var heading3 = DownColor.black
+    public var body = DownColor.black
+    public var code = DownColor.black
+    public var link = DownColor.systemBlue
+    public var quote = DownColor.darkGray
+    public var quoteStripe = DownColor.darkGray
+    public var thematicBreak = DownColor(white: 0.9, alpha: 1)
+    public var listItemPrefix = DownColor.lightGray
+    public var codeBlockBackground = DownColor(red: 0.96, green: 0.97, blue: 0.98, alpha: 1)
+}