Fix gradient coordinate percentage parsing

DOM/Sources/Parser.XML.Attributes.swift

@@ -112,7 +112,12 @@ extension XMLParser {
       var scanner = XMLParser.Scanner(text: value)
       return try scanner.scanCoordinate()
     }
-
+
+    func parseCoordinateOrPercentage(_ value: String) throws -> DOM.Coordinate {
+      var scanner = XMLParser.Scanner(text: value)
+      return try scanner.scanCoordinateOrPercentage()
+    }
+
     func parseLength(_ value: String) throws -> DOM.Length {
       var scanner = XMLParser.Scanner(text: value)
       return try scanner.scanLength()

DOM/Sources/Parser.XML.LinearGradient.swift

@@ -51,10 +51,10 @@ extension XMLParser {
 
         let nodeAtt: any AttributeParser = try parseAttributes(e)
         let node = DOM.LinearGradient(id: try nodeAtt.parseString("id"))
-        node.x1 = try nodeAtt.parseCoordinate("x1")
-        node.y1 = try nodeAtt.parseCoordinate("y1")
-        node.x2 = try nodeAtt.parseCoordinate("x2")
-        node.y2 = try nodeAtt.parseCoordinate("y2")
+        node.x1 = try nodeAtt.parseCoordinateOrPercentage("x1")
+        node.y1 = try nodeAtt.parseCoordinateOrPercentage("y1")
+        node.x2 = try nodeAtt.parseCoordinateOrPercentage("x2")
+        node.y2 = try nodeAtt.parseCoordinateOrPercentage("y2")
 
         for n in e.children where n.name == "stop" {
             let att: any AttributeParser = try parseAttributes(n)

DOM/Sources/Parser.XML.RadialGradient.swift

@@ -51,12 +51,12 @@ extension XMLParser {
 
         let nodeAtt: any AttributeParser = try parseAttributes(e)
         let node = DOM.RadialGradient(id: try nodeAtt.parseString("id"))
-        node.r = try? nodeAtt.parseCoordinate("r")
-        node.cx = try? nodeAtt.parseCoordinate("cx")
-        node.cy = try? nodeAtt.parseCoordinate("cy")
-        node.fr = try? nodeAtt.parseCoordinate("fr")
-        node.fx = try? nodeAtt.parseCoordinate("fx")
-        node.fy = try? nodeAtt.parseCoordinate("fy")
+        node.r = try? nodeAtt.parseCoordinateOrPercentage("r")
+        node.cx = try? nodeAtt.parseCoordinateOrPercentage("cx")
+        node.cy = try? nodeAtt.parseCoordinateOrPercentage("cy")
+        node.fr = try? nodeAtt.parseCoordinateOrPercentage("fr")
+        node.fx = try? nodeAtt.parseCoordinateOrPercentage("fx")
+        node.fy = try? nodeAtt.parseCoordinateOrPercentage("fy")
 
         for n in e.children where n.name == "stop" {
             let att: any AttributeParser = try parseAttributes(n)

DOM/Sources/Parser.XML.Scanner.swift

@@ -311,6 +311,17 @@ package extension XMLParser {
             let unit = scanUnit() ?? .pixel
             return DOM.Coordinate(double.apply(unit: unit))
         }
+
+        package mutating func scanCoordinateOrPercentage() throws -> DOM.Coordinate {
+            let double = try scanDouble()
+            scanner.currentIndex = currentIndex
+            if scanner.scanString("%") != nil {
+                currentIndex = scanner.currentIndex
+                return DOM.Coordinate(double / 100.0)
+            }
+            let unit = scanUnit() ?? .pixel
+            return DOM.Coordinate(double.apply(unit: unit))
+        }
 
         package mutating func scanPercentageFloat() throws -> Float {
             scanner.currentIndex = currentIndex

DOM/Sources/Parser.XML.swift

@@ -65,6 +65,7 @@ package protocol AttributeValueParser {
     func parseFloats(_ value: String) throws -> [DOM.Float]
     func parsePercentage(_ value: String) throws -> DOM.Float
     func parseCoordinate(_ value: String) throws -> DOM.Coordinate
+    func parseCoordinateOrPercentage(_ value: String) throws -> DOM.Coordinate
     func parseLength(_ value: String) throws -> DOM.Length
     func parseBool(_ value: String) throws -> DOM.Bool
     func parseFill(_ value: String) throws -> DOM.Fill
@@ -108,6 +109,10 @@ package extension AttributeParser {
         return try parse(key) { return try parser.parseCoordinate($0) }
     }
 
+    func parseCoordinateOrPercentage(_ key: String) throws -> DOM.Coordinate {
+        return try parse(key) { return try parser.parseCoordinateOrPercentage($0) }
+    }
+
     func parseLength(_ key: String) throws -> DOM.Length {
         return try parse(key) { return try parser.parseLength($0) }
     }
@@ -187,6 +192,10 @@ package extension AttributeParser {
         return try parse(key) { return try parser.parseCoordinate($0) }
     }
 
+    func parseCoordinateOrPercentage(_ key: String) throws -> DOM.Coordinate? {
+        return try parse(key) { return try parser.parseCoordinateOrPercentage($0) }
+    }
+
     func parseLength(_ key: String) throws -> DOM.Length? {
         return try parse(key) { return try parser.parseLength($0) }
     }

DOM/Tests/Parser.XML.LinearGradientTests.swift

@@ -49,6 +49,38 @@ struct ParserXMLLinearGradientTests {
         #expect(try XMLParser().parseLinearGradients(parent).count == 3)
     }
 
+    @Test
+    func parseCoordinatesWithPercentage() throws {
+        let element = XML.Element(name: "linearGradient", attributes: [
+            "id": "a",
+            "x1": "3.309%",
+            "y1": "28.41%",
+            "x2": "103.216%",
+            "y2": "64.511%"
+        ])
+        let gradient = try XMLParser().parseLinearGradient(element)
+        #expect(abs((gradient.x1 ?? 0) - 0.03309) < 0.0001)
+        #expect(abs((gradient.y1 ?? 0) - 0.2841) < 0.0001)
+        #expect(abs((gradient.x2 ?? 0) - 1.03216) < 0.0001)
+        #expect(abs((gradient.y2 ?? 0) - 0.64511) < 0.0001)
+    }
+
+    @Test
+    func parseCoordinatesWithoutPercentage() throws {
+        let element = XML.Element(name: "linearGradient", attributes: [
+            "id": "b",
+            "x1": "0",
+            "y1": "0.5",
+            "x2": "1",
+            "y2": "0.5"
+        ])
+        let gradient = try XMLParser().parseLinearGradient(element)
+        #expect(gradient.x1 == 0)
+        #expect(gradient.y1 == 0.5)
+        #expect(gradient.x2 == 1)
+        #expect(gradient.y2 == 0.5)
+    }
+
     @Test
     func parseFile() throws {
         let dom = try DOM.SVG.parse(fileNamed: "linearGradient.svg", in: .test)

DOM/Tests/Parser.XML.RadialGradientTests.swift

@@ -50,6 +50,23 @@ struct ParserXMLRadialGradientTests {
         #expect(try XMLParser().parseRadialGradients(parent).count == 3)
     }
 
+    @Test
+    func parseCoordinatesWithPercentage() throws {
+        let element = XML.Element.makeMockGradient()
+        element.attributes["r"] = "10%"
+        element.attributes["cx"] = "50%"
+        element.attributes["cy"] = "25%"
+        element.attributes["fx"] = "50%"
+        element.attributes["fy"] = "25%"
+
+        let gradient = try XMLParser().parseRadialGradient(element)
+        #expect(abs((gradient.r ?? 0) - 0.1) < 0.0001)
+        #expect(abs((gradient.cx ?? 0) - 0.5) < 0.0001)
+        #expect(abs((gradient.cy ?? 0) - 0.25) < 0.0001)
+        #expect(abs((gradient.fx ?? 0) - 0.5) < 0.0001)
+        #expect(abs((gradient.fy ?? 0) - 0.25) < 0.0001)
+    }
+
     @Test
     func parseCoordinates() throws {
         let element = XML.Element.makeMockGradient()