Stylesheet renderer (#1)

* New stylesheet renderer object
* Minification & custom indentation support
* Write doubles as int if possible
* Updated unit tests & minor fixes

Author: tib

Sources/SwiftCss/CSS/CSSRepresentable.swift

@@ -7,69 +7,69 @@
 
 public struct CSSColor: ExpressibleByStringLiteral {
 
-    private var css: String
+    private var colorValue: String
 
     init(raw: String) {
-        css = raw
+        colorValue = raw
     }
 
 //    init(hex: String) {
 //        css = hex
 //    }
-    
+
     public init(stringLiteral value: StringLiteralType) {
-        css = value
+        colorValue = value
         /// check if length is valid (000, #000, cafe00, #cafe00)
         assert([3,4,6,7].contains(value.count), "Invalid hex string")
 
         /// add # prefix if missing
-        if !css.hasPrefix("#") {
-            css = "#" + css
+        if !colorValue.hasPrefix("#") {
+            colorValue = "#" + colorValue
         }
     }
 
     public init(r: Int, g: Int, b: Int, a: Double? = nil) {
-        css = "\(r),\(g),\(b)"
+        colorValue = "\(r),\(g),\(b)"
         if let a = a {
-            css = "rgba(" + css + ", \(a))"
+            colorValue = "rgba(" + colorValue + ", \(a))"
         }
         else {
-            css = "rgb(" + css + ")"
+            colorValue = "rgb(" + colorValue + ")"
         }
     }
 
     public init(r: Double, g: Double, b: Double, a: Double? = nil) {
-        css = "\(r)%,\(g)%,\(b)%"
+        colorValue = "\(r)%,\(g)%,\(b)%"
         if let a = a {
-            css = "rgba(" + css + ", \(a))"
+            colorValue = "rgba(" + colorValue + ", \(a))"
         }
         else {
-            css = "rgb(" + css + ")"
+            colorValue = "rgb(" + colorValue + ")"
         }
     }
 
     public init(h: Int, s: Int, l: Int, a: Double? = nil) {
-        css = "\(h),\(s),\(l)"
+        colorValue = "\(h),\(s),\(l)"
         if let a = a {
-            css = "hsla(" + css + ", \(a))"
+            colorValue = "hsla(" + colorValue + ", \(a))"
         }
         else {
-            css = "hsl(" + css + ")"
+            colorValue = "hsl(" + colorValue + ")"
         }
     }
 
     public init(h: Double, s: Double, l: Double, a: Double? = nil) {
-        css = "\(h)%,\(s)%,\(l)%"
+        colorValue = "\(h)%,\(s)%,\(l)%"
         if let a = a {
-            css = "hsla(" + css + ", \(a))"
+            colorValue = "hsla(" + colorValue + ", \(a))"
         }
         else {
-            css = "hsl(" + css + ")"
+            colorValue = "hsl(" + colorValue + ")"
         }
     }
 
     var rawValue: String {
-        css
+        colorValue
     }
 }
 

Sources/SwiftCss/CSS/Stylesheet.swift

@@ -6,7 +6,7 @@
 //
 
 /// https://www.w3schools.com/cssref/
-public struct Property: CSSRepresentable {
+public struct Property {
     var name: String
     var value: String
     var isImportant: Bool = false
@@ -16,11 +16,7 @@ public struct Property: CSSRepresentable {
         self.value = value
         self.isImportant = isImportant
     }
-    
-    public var css: String {
-        "\t" + name + ": " + value + (isImportant ? " !important" : "") + ";\n"
-    }
-    
+
     public func important() -> Property {
         guard !isImportant else {
             return self

Sources/SwiftCss/Components/CSSColor.swift

@@ -5,6 +5,6 @@
 //  Created by Tibor Bodecs on 2021. 07. 10..
 //
 
-public protocol Rule: CSSRepresentable {
+public protocol Rule {
 
 }

Sources/SwiftCss/Components/Property.swift

@@ -6,7 +6,7 @@
 //
 
 /// https://www.w3schools.com/cssref/css_selectors.asp
-public struct Selector: CSSRepresentable {
+public struct Selector {
     var name: String
     var properties: [Property]
     var pseudo: String? = nil
@@ -21,12 +21,4 @@ public struct Selector: CSSRepresentable {
         self.name = name
         self.properties = builder()
     }
-    
-    public var css: String {
-        var suffix = ""
-        if let pseudo = pseudo {
-            suffix = pseudo
-        }
-        return name + suffix + " {\n" + properties.map(\.css).joined() + "}\n"
-    }
 }

Sources/SwiftCss/Components/Rule.swift

@@ -5,6 +5,17 @@
 //  Created by Tibor Bodecs on 2021. 07. 10..
 //
 
+fileprivate extension Double {
+
+    /// converts a double value into an integer if it has no fraction digits, otherwise it uses the double value
+    var asIntOrDouble: String {
+        if truncatingRemainder(dividingBy: 1) == 0 {
+            return String(Int(self))
+        }
+        return String(self)
+    }
+}
+
 public enum Unit {
     case zero
 
@@ -45,35 +56,35 @@ public enum Unit {
         case .zero:
             return "0"
         case .cm(let value):
-            return "\(value)cm"
+            return "\(value.asIntOrDouble)cm"
         case .mm(let value):
-            return "\(value)mm"
+            return "\(value.asIntOrDouble)mm"
         case .in(let value):
-            return "\(value)in"
+            return "\(value.asIntOrDouble)in"
         case .px(let value):
-            return "\(value)px"
+            return "\(value.asIntOrDouble)px"
         case .pt(let value):
-            return "\(value)pt"
+            return "\(value.asIntOrDouble)pt"
         case .pc(let value):
-            return "\(value)pc"
+            return "\(value.asIntOrDouble)pc"
         case .em(let value):
-            return "\(value)em"
+            return "\(value.asIntOrDouble)em"
         case .ex(let value):
-            return "\(value)ex"
+            return "\(value.asIntOrDouble)ex"
         case .ch(let value):
-            return "\(value)ch"
+            return "\(value.asIntOrDouble)ch"
         case .rem(let value):
-            return "\(value)rem"
+            return "\(value.asIntOrDouble)rem"
         case .vw(let value):
-            return "\(value)vw"
+            return "\(value.asIntOrDouble)vw"
         case .vh(let value):
-            return "\(value)vh"
+            return "\(value.asIntOrDouble)vh"
         case .vmin(let value):
-            return "\(value)vmin"
+            return "\(value.asIntOrDouble)vmin"
         case .vmax(let value):
-            return "\(value)vmax"
+            return "\(value.asIntOrDouble)vmax"
         case .percent(let value):
-            return "\(value)%"
+            return "\(value.asIntOrDouble)%"
         }
     }
 }

Sources/SwiftCss/Components/Selector.swift

@@ -12,9 +12,4 @@ public struct Charset: Rule {
     public init(_ name: String) {
         self.name = name
     }
-    
-    /// @charset "UTF-8";
-    public var css: String {
-        #"@charset ""# + name + #"";"#
-    }
 }

Sources/SwiftCss/Components/Unit.swift

@@ -13,8 +13,4 @@ public struct FontFace: Rule {
         self.properties = builder()
     }
 
-    public var css: String {
-        let value = properties.map(\.css).joined()
-        return "@font-face {\n\t" + value.split(separator: "\n").joined(separator: "\n\t") + "\n}\n"
-    }
 }

Sources/SwiftCss/Rules/Charset.swift

@@ -16,9 +16,4 @@ public struct Import: Rule {
     public init(_ name: String) {
         self.name = name
     }
-    
-    /// @import "mobstyle.css" screen and (max-width: 768px);
-    public var css: String {
-        "@import " + name + ";"
-    }
 }

Sources/SwiftCss/Rules/FontFace.swift

@@ -14,9 +14,4 @@ public struct Keyframes: Rule {
         self.name = name
         self.selectors = builder()
     }
-    
-    public var css: String {
-        let value = selectors.map(\.css).joined()
-        return "@keyframes " + name + " {\n\t" + value.split(separator: "\n").joined(separator: "\n\t") + "\n}\n"
-    }
 }

Sources/SwiftCss/Rules/Import.swift

@@ -35,12 +35,4 @@ public struct Media: Rule {
     public init(screen: Screen, @SelectorBuilder _ builder: () -> [Selector]) {
         self.init(screen.rawValue, builder)
     }    
-
-    public var css: String {
-        let css = selectors.map(\.css).joined()
-        guard let query = query else {
-            return css
-        }
-        return "@media " + query + " {\n\t" + css.split(separator: "\n").joined(separator: "\n\t") + "\n}\n"
-    }
 }

Sources/SwiftCss/Rules/Keyframes.swift

@@ -0,0 +1,14 @@
+//
+//  Stylesheet.swift
+//  SwiftCss
+//
+//  Created by Tibor Bodecs on 2021. 07. 09..
+//
+
+public struct Stylesheet {
+    let rules: [Rule]
+
+    public init(@RuleBuilder _ builder: () -> [Rule]) {
+        self.rules = builder()
+    }
+}