import Foundation import CoreGraphics #if !CARTHAGE import SWXMLHash #endif /// /// This class used to parse SVG file and build corresponding Macaw scene /// open class SVGParser { /// Parse an SVG file identified by the specified bundle, name and file extension. /// - returns: Root node of the corresponding Macaw scene. open class func parse(bundle: Bundle, path: String, ofType: String = "svg") throws -> Node { guard let fullPath = bundle.path(forResource: path, ofType: ofType) else { throw SVGParserError.noSuchFile(path: "\(path).\(ofType)") } let text = try String(contentsOfFile: fullPath, encoding: String.Encoding.utf8) return try SVGParser.parse(text: text) } /// Parse an SVG file identified by the specified name and file extension. /// - returns: Root node of the corresponding Macaw scene. open class func parse(path: String, ofType: String = "svg") throws -> Node { return try SVGParser.parse(bundle: Bundle.main, path: path, ofType: ofType) } /// Parse the specified content of an SVG file. /// - returns: Root node of the corresponding Macaw scene. open class func parse(text: String) throws -> Node { return SVGParser(text).parse() } let availableStyleAttributes = ["stroke", "stroke-width", "stroke-opacity", "stroke-dasharray", "stroke-linecap", "stroke-linejoin", "fill", "text-anchor", "fill-opacity", "stop-color", "stop-opacity", "font-family", "font-size", "font-weight", "opacity"] fileprivate let xmlString: String fileprivate let initialPosition: Transform fileprivate var nodes = [Node]() fileprivate var defNodes = [String: Node]() fileprivate var defFills = [String: Fill]() fileprivate var defMasks = [String: Shape]() fileprivate enum PathCommandType { case moveTo case lineTo case lineV case lineH case curveTo case smoothCurveTo case closePath case none } fileprivate typealias PathCommand = (type: PathCommandType, expression: String, absolute: Bool) fileprivate init(_ string: String, pos: Transform = Transform()) { self.xmlString = string self.initialPosition = pos } fileprivate func parse() -> Group { let parsedXml = SWXMLHash.parse(xmlString) iterateThroughXmlTree(parsedXml.children) let group = Group(contents: self.nodes, place: initialPosition) return group } fileprivate func iterateThroughXmlTree(_ children: [XMLIndexer]) { children.forEach { child in if let element = child.element { if element.name == "svg" { iterateThroughXmlTree(child.children) } else if let node = parseNode(child) { self.nodes.append(node) } } } } fileprivate func parseNode(_ node: XMLIndexer, groupStyle: [String: String] = [:]) -> Node? { if let element = node.element { if element.name == "g" { return parseGroup(node, groupStyle: groupStyle) } else if element.name == "style" { parseStyle(node) } else if element.name == "defs" { parseDefinitions(node) } else { return parseElement(node, groupStyle: groupStyle) } } return .none } fileprivate var styleTable: [String:[String:String]] = [:] fileprivate func parseStyle(_ styleNode: XMLIndexer) { if let rawStyle = styleNode.element?.text { var styleAttributes: [String: String] = [:] let parts = rawStyle.trimmingCharacters(in: .whitespacesAndNewlines).split(separator: "{") let className = String(parts[0].dropFirst()) let style = String(parts[1].dropLast()) let styleParts = style.replacingOccurrences(of: " ", with: "").components(separatedBy: ";") styleParts.forEach { styleAttribute in let currentStyle = styleAttribute.components(separatedBy: ":") if currentStyle.count == 2 { styleAttributes.updateValue(currentStyle[1], forKey: currentStyle[0]) } } styleTable[className] = styleAttributes } } fileprivate func parseDefinitions(_ defs: XMLIndexer) { for child in defs.children { guard let id = child.element?.allAttributes["id"]?.text else { continue } if let fill = parseFill(child) { self.defFills[id] = fill continue } if let node = parseNode(child) { self.defNodes[id] = node continue } if let mask = parseMask(child) { self.defMasks[id] = mask continue } } } fileprivate func parseElement(_ node: XMLIndexer, groupStyle: [String: String] = [:]) -> Node? { if let element = node.element { let styleAttributes = getStyleAttributes(groupStyle, element: element) let position = getPosition(element) switch element.name { case "path": if let path = parsePath(node) { return Shape(form: path, fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), place: position, opacity: getOpacity(styleAttributes), tag: getTag(element)) } case "line": if let line = parseLine(node) { return Shape(form: line, fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), place: position, opacity: getOpacity(styleAttributes), tag: getTag(element)) } case "rect": if let rect = parseRect(node) { return Shape(form: rect, fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), place: position, opacity: getOpacity(styleAttributes), tag: getTag(element)) } case "circle": if let circle = parseCircle(node) { return Shape(form: circle, fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), place: position, opacity: getOpacity(styleAttributes), tag: getTag(element)) } case "ellipse": if let ellipse = parseEllipse(node) { return Shape(form: ellipse, fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), place: position, opacity: getOpacity(styleAttributes), tag: getTag(element)) } case "polygon": if let polygon = parsePolygon(node) { return Shape(form: polygon, fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), place: position, opacity: getOpacity(styleAttributes), tag: getTag(element)) } case "polyline": if let polyline = parsePolyline(node) { return Shape(form: polyline, fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), place: position, opacity: getOpacity(styleAttributes), tag: getTag(element)) } case "image": return parseImage(node, opacity: getOpacity(styleAttributes), pos: position) case "text": return parseText(node, textAnchor: getTextAnchor(styleAttributes), fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), opacity: getOpacity(styleAttributes), fontName: getFontName(styleAttributes), fontSize: getFontSize(styleAttributes), fontWeight: getFontWeight(styleAttributes), pos: position) case "use": return parseUse(node, fill: getFillColor(styleAttributes), stroke: getStroke(styleAttributes), pos: position, opacity: getOpacity(styleAttributes)) case "mask": break default: print("SVG parsing error. Shape \(element.name) not supported") return .none } } return .none } fileprivate func parseFill(_ fill: XMLIndexer) -> Fill? { guard let element = fill.element else { return .none } switch element.name { case "linearGradient": return parseLinearGradient(fill) case "radialGradient": return parseRadialGradient(fill) default: return .none } } fileprivate func parseGroup(_ group: XMLIndexer, groupStyle: [String: String] = [:]) -> Group? { guard let element = group.element else { return .none } var groupNodes: [Node] = [] let style = getStyleAttributes(groupStyle, element: element) let position = getPosition(element) group.children.forEach { child in if let node = parseNode(child, groupStyle: style) { groupNodes.append(node) } } return Group(contents: groupNodes, place: position, tag: getTag(element)) } fileprivate func getMask(mask: String) -> Locus? { if let maskIdenitifierMatcher = SVGParserRegexHelper.getMaskIdenitifierMatcher() { let fullRange = NSMakeRange(0, mask.characters.count) if let match = maskIdenitifierMatcher.firstMatch(in: mask, options: .reportCompletion, range: fullRange), let maskReferenceNode = self.defMasks[(mask as NSString).substring(with: match.range(at: 1))] { return maskReferenceNode.form } } return .none } fileprivate func getPosition(_ element: SWXMLHash.XMLElement) -> Transform { guard let transformAttribute = element.allAttributes["transform"]?.text else { return Transform() } return parseTransformationAttribute(transformAttribute) } var count = 0 fileprivate func parseTransformationAttribute(_ attributes: String, transform: Transform = Transform()) -> Transform { guard let matcher = SVGParserRegexHelper.getTransformAttributeMatcher() else { return transform } var finalTransform = transform let fullRange = NSRange(location: 0, length: attributes.characters.count) if let matchedAttribute = matcher.firstMatch(in: attributes, options: .reportCompletion, range: fullRange) { let attributeName = (attributes as NSString).substring(with: matchedAttribute.range(at: 1)) let values = parseTransformValues((attributes as NSString).substring(with: matchedAttribute.range(at: 2))) if values.isEmpty { return transform } switch attributeName { case "translate": if let x = Double(values[0]) { var y: Double = 0 if values.indices.contains(1) { y = Double(values[1]) ?? 0 } finalTransform = transform.move(dx: x, dy: y) } case "scale": if let x = Double(values[0]) { var y: Double = x if values.indices.contains(1) { y = Double(values[1]) ?? x } finalTransform = transform.scale(sx: x, sy: y) } case "rotate": if let angle = Double(values[0]) { if values.count == 1 { finalTransform = transform.rotate(angle: degreesToRadians(angle)) } else if values.count == 3 { if let x = Double(values[1]), let y = Double(values[2]) { finalTransform = transform.move(dx: x, dy: y).rotate(angle: degreesToRadians(angle)).move(dx: -x, dy: -y) } } } case "skewX": if let x = Double(values[0]) { finalTransform = transform.shear(shx: x, shy: 0) } case "skewY": if let y = Double(values[0]) { finalTransform = transform.shear(shx: 0, shy: y) } case "matrix": if values.count != 6 { return transform } if let m11 = Double(values[0]), let m12 = Double(values[1]), let m21 = Double(values[2]), let m22 = Double(values[3]), let dx = Double(values[4]), let dy = Double(values[5]) { let transformMatrix = Transform(m11: m11, m12: m12, m21: m21, m22: m22, dx: dx, dy: dy) finalTransform = GeomUtils.concat(t1: transform, t2: transformMatrix) } default: break } let rangeToRemove = NSRange(location: 0, length: matchedAttribute.range.location + matchedAttribute.range.length) let newAttributeString = (attributes as NSString).replacingCharacters(in: rangeToRemove, with: "") return parseTransformationAttribute(newAttributeString, transform: finalTransform) } else { return transform } } /// Parse an RGB /// - returns: Color for the corresponding SVG color string in RGB notation. fileprivate func parseRGBNotation(colorString: String) -> Color { let from = colorString.characters.index(colorString.startIndex, offsetBy: 4) let inPercentage = colorString.characters.contains("%") let sp = String(colorString.suffix(from: from)) .replacingOccurrences(of: "%", with: "") .replacingOccurrences(of: ")", with: "") .replacingOccurrences(of: " ", with: "") let x = sp.components(separatedBy: ",") var red = 0.0 var green = 0.0 var blue = 0.0 if (x.count == 3) { if let r = Double(x[0]), let g = Double(x[1]), let b = Double(x[2]) { blue = b green = g red = r } } if inPercentage { red *= 2.55 green *= 2.55 blue *= 2.55 } return Color.rgb(r: Int(red.rounded(.up)), g: Int(green.rounded(.up)), b: Int(blue.rounded(.up))) } fileprivate func parseTransformValues(_ values: String, collectedValues: [String] = []) -> [String] { guard let matcher = SVGParserRegexHelper.getTransformMatcher() else { return collectedValues } var updatedValues: [String] = collectedValues let fullRange = NSRange(location: 0, length: values.characters.count) if let matchedValue = matcher.firstMatch(in: values, options: .reportCompletion, range: fullRange) { let value = (values as NSString).substring(with: matchedValue.range) updatedValues.append(value) let rangeToRemove = NSRange(location: 0, length: matchedValue.range.location + matchedValue.range.length) let newValues = (values as NSString).replacingCharacters(in: rangeToRemove, with: "") return parseTransformValues(newValues, collectedValues: updatedValues) } return updatedValues } fileprivate func getStyleAttributes(_ groupAttributes: [String: String], element: SWXMLHash.XMLElement) -> [String: String] { var styleAttributes: [String: String] = groupAttributes if let style = element.allAttributes["style"]?.text { let styleParts = style.replacingOccurrences(of: " ", with: "").components(separatedBy: ";") styleParts.forEach { styleAttribute in let currentStyle = styleAttribute.components(separatedBy: ":") if currentStyle.count == 2 { styleAttributes.updateValue(currentStyle[1], forKey: currentStyle[0]) } } } else { self.availableStyleAttributes.forEach { availableAttribute in if let styleAttribute = element.allAttributes[availableAttribute]?.text { styleAttributes.updateValue(styleAttribute, forKey: availableAttribute) } } } if let className = element.allAttributes["class"]?.text, let styleAttributesFromTable = styleTable[className] { for (att, val) in styleAttributesFromTable { if styleAttributes.index(forKey: att) == nil { styleAttributes.updateValue(val, forKey: att) } } } return styleAttributes } fileprivate func createColor(_ hexString: String, opacity: Double = 1) -> Color { var cleanedHexString = hexString if hexString.hasPrefix("#") { cleanedHexString = hexString.replacingOccurrences(of: "#", with: "") } var rgbValue: UInt32 = 0 Scanner(string: cleanedHexString).scanHexInt32(&rgbValue) let red = CGFloat((rgbValue >> 16) & 0xff) let green = CGFloat((rgbValue >> 08) & 0xff) let blue = CGFloat((rgbValue >> 00) & 0xff) return Color.rgba(r: Int(red), g: Int(green), b: Int(blue), a: opacity) } fileprivate func getFillColor(_ styleParts: [String: String]) -> Fill? { guard let fillColor = styleParts["fill"] else { return Color.black } if fillColor == "none" || fillColor == "transparent" { return .none } var opacity: Double = 1 var hasFillOpacity = false if let fillOpacity = styleParts["fill-opacity"] { opacity = Double(fillOpacity.replacingOccurrences(of: " ", with: "")) ?? 1 hasFillOpacity = true } if let defaultColor = SVGConstants.colorList[fillColor] { let color = Color(val: defaultColor) return hasFillOpacity ? color.with(a: opacity) : color } if fillColor.hasPrefix("rgb") { let color = parseRGBNotation(colorString: fillColor) return hasFillOpacity ? color.with(a: opacity) : color } else if fillColor.hasPrefix("url") { let index = fillColor.characters.index(fillColor.startIndex, offsetBy: 4) let id = String(fillColor.suffix(from: index)) .replacingOccurrences(of: "(", with: "") .replacingOccurrences(of: ")", with: "") .replacingOccurrences(of: "#", with: "") return defFills[id] } else { return createColor(fillColor.replacingOccurrences(of: " ", with: ""), opacity: opacity) } } fileprivate func getStroke(_ styleParts: [String: String]) -> Stroke? { guard let strokeColor = styleParts["stroke"] else { return .none } if strokeColor == "none" { return .none } var opacity: Double = 1 if let strokeOpacity = styleParts["stroke-opacity"] { opacity = Double(strokeOpacity.replacingOccurrences(of: " ", with: "")) ?? 1 } var fill: Fill? if let defaultColor = SVGConstants.colorList[strokeColor] { let color = Color(val: defaultColor) fill = color.with(a: opacity) } else if strokeColor.hasPrefix("rgb") { fill = parseRGBNotation(colorString: strokeColor) } else if strokeColor.hasPrefix("url") { let index = strokeColor.characters.index(strokeColor.startIndex, offsetBy: 4) let id = String(strokeColor.suffix(from: index)) .replacingOccurrences(of: "(", with: "") .replacingOccurrences(of: ")", with: "") .replacingOccurrences(of: "#", with: "") fill = defFills[id] } else { fill = createColor(strokeColor.replacingOccurrences(of: " ", with: ""), opacity: opacity) } if let strokeFill = fill { return Stroke(fill: strokeFill, width: getStrokeWidth(styleParts), cap: getStrokeCap(styleParts), join: getStrokeJoin(styleParts), dashes: getStrokeDashes(styleParts)) } return .none } fileprivate func getStrokeWidth(_ styleParts: [String: String]) -> Double { if let strokeWidth = styleParts["stroke-width"] { let characterSet = NSCharacterSet.decimalDigits.union(NSCharacterSet.punctuationCharacters).inverted let digitsArray = strokeWidth.components(separatedBy: characterSet) let digits = digitsArray.joined(separator: "") if let value = NumberFormatter().number(from: digits) { return value.doubleValue } } return 1 } fileprivate func getStrokeCap(_ styleParts: [String: String]) -> LineCap { var cap = LineCap.butt if let strokeCap = styleParts["stroke-linecap"] { switch strokeCap { case "butt": cap = .butt case "square": cap = .square default: break } } return cap } fileprivate func getStrokeJoin(_ styleParts: [String: String]) -> LineJoin { var join = LineJoin.miter if let strokeJoin = styleParts["stroke-linejoin"] { switch strokeJoin { case "miter": join = .miter case "bevel": join = .bevel default: break } } return join } fileprivate func getStrokeDashes(_ styleParts: [String: String]) -> [Double] { var dashes = [Double]() if let strokeDashes = styleParts["stroke-dasharray"] { var characterSet = CharacterSet() characterSet.insert(" ") characterSet.insert(",") let separatedValues = strokeDashes.components(separatedBy: characterSet) separatedValues.forEach { value in if let doubleValue = Double(value) { dashes.append(doubleValue) } } } return dashes } fileprivate func getTag(_ element: SWXMLHash.XMLElement) -> [String] { let id = element.allAttributes["id"]?.text return id != nil ? [id!] : [] } fileprivate func getOpacity(_ styleParts: [String: String]) -> Double { if let opacityAttr = styleParts["opacity"] { return Double(opacityAttr.replacingOccurrences(of: " ", with: "")) ?? 1 } return 1 } fileprivate func parseLine(_ line: XMLIndexer) -> Line? { guard let element = line.element else { return .none } return Line(x1: getDoubleValue(element, attribute: "x1") ?? 0, y1: getDoubleValue(element, attribute: "y1") ?? 0, x2: getDoubleValue(element, attribute: "x2") ?? 0, y2: getDoubleValue(element, attribute: "y2") ?? 0) } fileprivate func parseRect(_ rect: XMLIndexer) -> Locus? { guard let element = rect.element, let width = getDoubleValue(element, attribute: "width"), let height = getDoubleValue(element, attribute: "height") , width > 0 && height > 0 else { return .none } let resultRect = Rect(x: getDoubleValue(element, attribute: "x") ?? 0, y: getDoubleValue(element, attribute: "y") ?? 0, w: width, h: height) let rxOpt = getDoubleValue(element, attribute: "rx") let ryOpt = getDoubleValue(element, attribute: "ry") if let rx = rxOpt, let ry = ryOpt { return RoundRect(rect: resultRect, rx: rx, ry: ry) } let rOpt = rxOpt ?? ryOpt if let r = rOpt , r >= 0 { return RoundRect(rect: resultRect, rx: r, ry: r) } return resultRect } fileprivate func parseCircle(_ circle: XMLIndexer) -> Circle? { guard let element = circle.element, let r = getDoubleValue(element, attribute: "r") , r > 0 else { return .none } return Circle(cx: getDoubleValue(element, attribute: "cx") ?? 0, cy: getDoubleValue(element, attribute: "cy") ?? 0, r: r) } fileprivate func parseEllipse(_ ellipse: XMLIndexer) -> Arc? { guard let element = ellipse.element, let rx = getDoubleValue(element, attribute: "rx"), let ry = getDoubleValue(element, attribute: "ry") , rx > 0 && ry > 0 else { return .none } return Arc( ellipse: Ellipse(cx: getDoubleValue(element, attribute: "cx") ?? 0, cy: getDoubleValue(element, attribute: "cy") ?? 0, rx: rx, ry: ry), shift: 0, extent: degreesToRadians(360) ) } fileprivate func parsePolygon(_ polygon: XMLIndexer) -> Polygon? { guard let element = polygon.element else { return .none } if let points = element.allAttributes["points"]?.text { return Polygon(points: parsePoints(points)) } return .none } fileprivate func parsePolyline(_ polyline: XMLIndexer) -> Polyline? { guard let element = polyline.element else { return .none } if let points = element.allAttributes["points"]?.text { return Polyline(points: parsePoints(points)) } return .none } fileprivate func parsePoints(_ pointsString: String) -> [Double] { var resultPoints: [Double] = [] let pointPairs = pointsString.components(separatedBy: " ") pointPairs.forEach { pointPair in let points = pointPair.components(separatedBy: ",") points.forEach { point in if let resultPoint = Double(point) { resultPoints.append(resultPoint) } } } return resultPoints } fileprivate func parseImage(_ image: XMLIndexer, opacity: Double, pos: Transform = Transform()) -> Image? { guard let element = image.element, let link = element.allAttributes["xlink:href"]?.text else { return .none } let position = pos.move(dx: getDoubleValue(element, attribute: "x") ?? 0, dy: getDoubleValue(element, attribute: "y") ?? 0) return Image(src: link, w: getIntValue(element, attribute: "width") ?? 0, h: getIntValue(element, attribute: "height") ?? 0, place: position, tag: getTag(element)) } fileprivate func parseText(_ text: XMLIndexer, textAnchor: String?, fill: Fill?, stroke: Stroke?, opacity: Double, fontName: String?, fontSize: Int?, fontWeight: String?, pos: Transform = Transform()) -> Node? { guard let element = text.element else { return .none } if text.children.isEmpty { return parseSimpleText(element, textAnchor: textAnchor, fill: fill, stroke: stroke, opacity: opacity, fontName: fontName, fontSize: fontSize, fontWeight: fontWeight) } else { guard let matcher = SVGParserRegexHelper.getTextElementMatcher() else { return .none } let elementString = element.description let fullRange = NSMakeRange(0, elementString.characters.count) if let match = matcher.firstMatch(in: elementString, options: .reportCompletion, range: fullRange) { let tspans = (elementString as NSString).substring(with: match.range(at: 1)) return Group(contents: collectTspans(tspans, fill: fill, opacity: opacity, fontName: fontName, fontSize: fontSize, fontWeight: fontWeight, bounds: Rect(x: getDoubleValue(element, attribute: "x") ?? 0, y: getDoubleValue(element, attribute: "y") ?? 0)), place: pos, tag: getTag(element)) } } return .none } fileprivate func parseSimpleText(_ text: SWXMLHash.XMLElement, textAnchor: String?, fill: Fill?, stroke: Stroke?, opacity: Double, fontName: String?, fontSize: Int?, fontWeight: String?, pos: Transform = Transform()) -> Text? { let string = text.text let position = pos.move(dx: getDoubleValue(text, attribute: "x") ?? 0, dy: getDoubleValue(text, attribute: "y") ?? 0) var align = Align.min if let anchor = textAnchor { if anchor == "middle" { align = .mid } else if anchor == "right" { align = .max } } return Text(text: string, font: getFont(fontName: fontName, fontWeight: fontWeight, fontSize: fontSize), fill: fill ?? Color.black, stroke: stroke, align: align, place: position, opacity: opacity, tag: getTag(text)) } // REFACTOR fileprivate func collectTspans(_ tspan: String, collectedTspans: [Node] = [], withWhitespace: Bool = false, fill: Fill?, opacity: Double, fontName: String?, fontSize: Int?, fontWeight: String?, bounds: Rect) -> [Node] { let fullString = tspan.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines) as NSString // exit recursion if fullString.isEqual(to: "") { return collectedTspans } var collection = collectedTspans let tagRange = fullString.range(of: " element let closingTagRange = fullString.range(of: "".lowercased()) let tspanString = fullString.substring(to: closingTagRange.location + closingTagRange.length) let tspanXml = SWXMLHash.parse(tspanString) guard let indexer = tspanXml.children.first, let text = parseTspan(indexer, withWhitespace: withWhitespace, fill: fill, opacity: opacity, fontName: fontName, fontSize: fontSize, fontWeight: fontWeight, bounds: bounds) else { // skip this element if it can't be parsed return collectTspans(fullString.substring(from: closingTagRange.location + closingTagRange.length), collectedTspans: collectedTspans, fill: fill, opacity: opacity, fontName: fontName, fontSize: fontSize, fontWeight: fontWeight, bounds: bounds) } collection.append(text) let nextString = fullString.substring(from: closingTagRange.location + closingTagRange.length) as NSString var withWhitespace = false if nextString.rangeOfCharacter(from: CharacterSet.whitespacesAndNewlines).location == 0 { withWhitespace = true } return collectTspans(fullString.substring(from: closingTagRange.location + closingTagRange.length), collectedTspans: collection, withWhitespace: withWhitespace, fill: fill, opacity: opacity, fontName: fontName, fontSize: fontSize, fontWeight: fontWeight, bounds: text.bounds()) } // parse as regular text element var textString: NSString if tagRange.location >= fullString.length { textString = fullString } else { textString = fullString.substring(to: tagRange.location) as NSString } var nextStringWhitespace = false var trimmedString = textString.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines) if trimmedString.characters.count != textString.length { nextStringWhitespace = true } trimmedString = withWhitespace ? " \(trimmedString)" : trimmedString let text = Text(text: trimmedString, font: getFont(fontName: fontName, fontWeight: fontWeight, fontSize: fontSize), fill: fill ?? Color.black, baseline: .alphabetic, place: Transform().move(dx: bounds.x + bounds.w, dy: bounds.y), opacity: opacity) collection.append(text) return collectTspans(fullString.substring(from: tagRange.location), collectedTspans: collection, withWhitespace: nextStringWhitespace, fill: fill, opacity: opacity, fontName: fontName, fontSize: fontSize, fontWeight: fontWeight, bounds: text.bounds()) } fileprivate func parseTspan(_ tspan: XMLIndexer, withWhitespace: Bool = false, fill: Fill?, opacity: Double, fontName: String?, fontSize: Int?, fontWeight: String?, bounds: Rect) -> Text? { guard let element = tspan.element else { return .none } let string = element.text var shouldAddWhitespace = withWhitespace let pos = getTspanPosition(element, bounds: bounds, withWhitespace: &shouldAddWhitespace) let text = shouldAddWhitespace ? " \(string)" : string let attributes = getStyleAttributes([:], element: element) return Text(text: text, font: getFont(attributes, fontName: fontName, fontWeight: fontWeight, fontSize: fontSize), fill: fill ?? getFillColor(attributes) ?? Color.black, baseline: .alphabetic, place: pos, opacity: getOpacity(attributes), tag: getTag(element)) } fileprivate func getFont(_ attributes: [String: String] = [:], fontName: String?, fontWeight: String?, fontSize: Int?) -> Font { return Font( name: getFontName(attributes) ?? fontName ?? "Serif", size: getFontSize(attributes) ?? fontSize ?? 12, weight: getFontWeight(attributes) ?? fontWeight ?? "normal") } fileprivate func getTspanPosition(_ element: SWXMLHash.XMLElement, bounds: Rect, withWhitespace: inout Bool) -> Transform { var xPos: Double var yPos: Double if let absX = getDoubleValue(element, attribute: "x") { xPos = absX withWhitespace = false } else if let relX = getDoubleValue(element, attribute: "dx") { xPos = bounds.x + bounds.w + relX } else { xPos = bounds.x + bounds.w } if let absY = getDoubleValue(element, attribute: "y") { yPos = absY } else if let relY = getDoubleValue(element, attribute: "dy") { yPos = bounds.y + relY } else { yPos = bounds.y } return Transform().move(dx: xPos, dy: yPos) } fileprivate func parseUse(_ use: XMLIndexer, fill: Fill?, stroke: Stroke?, pos: Transform, opacity: Double) -> Node? { guard let element = use.element, let link = element.allAttributes["xlink:href"]?.text else { return .none } var id = link if id.hasPrefix("#") { id = id.replacingOccurrences(of: "#", with: "") } guard let referenceNode = self.defNodes[id], let node = copyNode(referenceNode) else { return .none } node.place = pos.move(dx: getDoubleValue(element, attribute: "x") ?? 0, dy: getDoubleValue(element, attribute: "y") ?? 0) node.opacity = opacity let maskString = element.allAttributes["mask"]?.text ?? "" return parseUseNode(node: node, fill: fill, stroke: stroke, mask: maskString) } fileprivate func parseUseNode(node: Node, fill: Fill?, stroke: Stroke?, mask: String) -> Node { if let shape = node as? Shape { if let color = fill { shape.fill = color } if let line = stroke { shape.stroke = line } if let maskIdenitifierMatcher = SVGParserRegexHelper.getMaskIdenitifierMatcher() { let fullRange = NSMakeRange(0, mask.characters.count) if let match = maskIdenitifierMatcher.firstMatch(in: mask, options: .reportCompletion, range: fullRange), let maskReferenceNode = self.defMasks[(mask as NSString).substring(with: match.range(at: 1))] { shape.clip = maskReferenceNode.form shape.fill = .none } } return shape } if let text = node as? Text { if let color = fill { text.fill = color } return text } if let group = node as? Group { group.contents.forEach { node in _ = parseUseNode(node: node, fill: fill, stroke: stroke, mask: mask) } return group } return node } fileprivate func parseMask(_ mask: XMLIndexer) -> Shape? { guard let element = mask.element else { return .none } var node: Node? mask.children.forEach { indexer in if let useNode = parseUse(indexer, fill: .none, stroke: .none, pos: Transform(), opacity: 0) { node = useNode } else if let contentNode = parseNode(indexer) { node = contentNode } } guard let shape = node as? Shape else { return .none } let maskShape: Shape if let circle = shape.form as? Circle { maskShape = Shape(form: circle.arc(shift: 0, extent: degreesToRadians(360)), tag: getTag(element)) } else { maskShape = Shape(form: shape.form, tag: getTag(element)) } let maskStyleAttributes = getStyleAttributes([:], element: element) maskShape.fill = getFillColor(maskStyleAttributes) return maskShape } fileprivate func parseLinearGradient(_ gradient: XMLIndexer) -> Fill? { guard let element = gradient.element else { return .none } var parentGradient: Gradient? if let link = element.allAttributes["xlink:href"]?.text.replacingOccurrences(of: " ", with: "") , link.hasPrefix("#") { let id = link.replacingOccurrences(of: "#", with: "") parentGradient = defFills[id] as? Gradient } var stopsArray: [Stop]? if gradient.children.isEmpty { stopsArray = parentGradient?.stops } else { stopsArray = parseStops(gradient.children) } guard let stops = stopsArray else { return .none } switch stops.count { case 0: return .none case 1: return stops.first?.color default: break } let parentLinearGradient = parentGradient as? LinearGradient let x1 = getDoubleValueFromPercentage(element, attribute: "x1") ?? parentLinearGradient?.x1 ?? 0 let y1 = getDoubleValueFromPercentage(element, attribute: "y1") ?? parentLinearGradient?.y1 ?? 0 let x2 = getDoubleValueFromPercentage(element, attribute: "x2") ?? parentLinearGradient?.x2 ?? 1 let y2 = getDoubleValueFromPercentage(element, attribute: "y2") ?? parentLinearGradient?.y2 ?? 0 var userSpace = false if let gradientUnits = element.allAttributes["gradientUnits"]?.text , gradientUnits == "userSpaceOnUse" { userSpace = true } else if let parent = parentGradient { userSpace = parent.userSpace } let linearGradient = LinearGradient(x1: x1, y1: y1, x2: x2, y2: y2, userSpace: userSpace, stops: stops) if let gradientTransform = element.allAttributes["gradientTransform"]?.text { let transform = parseTransformationAttribute(gradientTransform) linearGradient.applyTransform(transform) } return linearGradient } fileprivate func parseRadialGradient(_ gradient: XMLIndexer) -> Fill? { guard let element = gradient.element else { return .none } var parentGradient: Gradient? if let link = element.allAttributes["xlink:href"]?.text.replacingOccurrences(of: " ", with: "") , link.hasPrefix("#") { let id = link.replacingOccurrences(of: "#", with: "") parentGradient = defFills[id] as? Gradient } var stopsArray: [Stop]? if gradient.children.isEmpty { stopsArray = parentGradient?.stops } else { stopsArray = parseStops(gradient.children) } guard let stops = stopsArray else { return .none } switch stops.count { case 0: return .none case 1: return stops.first?.color default: break } let parentRadialGradient = parentGradient as? RadialGradient let cx = getDoubleValueFromPercentage(element, attribute: "cx") ?? parentRadialGradient?.cx ?? 0.5 let cy = getDoubleValueFromPercentage(element, attribute: "cy") ?? parentRadialGradient?.cy ?? 0.5 let fx = getDoubleValueFromPercentage(element, attribute: "fx") ?? parentRadialGradient?.fx ?? cx let fy = getDoubleValueFromPercentage(element, attribute: "fy") ?? parentRadialGradient?.fy ?? cy let r = getDoubleValueFromPercentage(element, attribute: "r") ?? parentRadialGradient?.r ?? 0.5 var userSpace = false if let gradientUnits = element.allAttributes["gradientUnits"]?.text , gradientUnits == "userSpaceOnUse" { userSpace = true } else if let parent = parentGradient { userSpace = parent.userSpace } let radialGradient = RadialGradient(cx: cx, cy: cy, fx: fx, fy: fy, r: r, userSpace: userSpace, stops: stops) if let gradientTransform = element.allAttributes["gradientTransform"]?.text { let transform = parseTransformationAttribute(gradientTransform) radialGradient.applyTransform(transform) } return radialGradient } fileprivate func parseStops(_ stops: [XMLIndexer]) -> [Stop] { var result = [Stop]() stops.forEach { stopXML in if let stop = parseStop(stopXML) { result.append(stop) } } return result } fileprivate func parseStop(_ stop: XMLIndexer) -> Stop? { guard let element = stop.element else { return .none } guard var offset = getDoubleValueFromPercentage(element, attribute: "offset") else { return .none } if offset < 0 { offset = 0 } else if offset > 1 { offset = 1 } var opacity: Double = 1 if let stopOpacity = getStyleAttributes([:], element: element)["stop-opacity"], let doubleValue = Double(stopOpacity) { opacity = doubleValue } var color = Color.black if let stopColor = getStyleAttributes([:], element: element)["stop-color"] { color = createColor(stopColor.replacingOccurrences(of: " ", with: ""), opacity: opacity) } return Stop(offset: offset, color: color) } fileprivate func parsePath(_ path: XMLIndexer) -> Path? { if let dAttr = path.element?.allAttributes["d"]?.text { return Path(segments: parsePathCommands(dAttr)) } return .none } fileprivate func parsePathCommands(_ d: String) -> [PathSegment] { var d = d.trimmingCharacters(in: .whitespaces) var pathCommands = [PathCommand]() var pathCommandName: NSString? = "" var pathCommandValues: NSString? = "" let scanner = Scanner(string: d) let set = CharacterSet(charactersIn: SVGConstants.pathCommands.joined()) let charCount = d.characters.count repeat { scanner.scanCharacters(from: set, into: &pathCommandName) scanner.scanUpToCharacters(from: set, into: &pathCommandValues) pathCommands.append( PathCommand( type: getCommandType(pathCommandName! as String), expression: pathCommandValues! as String, absolute: isAbsolute(pathCommandName! as String) ) ) if scanner.scanLocation == charCount { break } } while pathCommandValues!.length > 0 var commands = [PathSegment]() pathCommands.forEach { command in if let parsedCommand = parseCommand(command) { commands.append(parsedCommand) } } return commands } fileprivate func parseCommand(_ command: PathCommand) -> PathSegment? { var characterSet = CharacterSet() characterSet.insert(" ") characterSet.insert(",") let commandParams = command.expression.components(separatedBy: characterSet) var separatedValues = [String]() commandParams.forEach { param in separatedValues.append(contentsOf: separateNegativeValuesIfNeeded(param)) } switch command.type { case .moveTo: var data = [Double]() separatedValues.forEach { value in if let double = Double(value) { data.append(double) } } if data.count < 2 { return .none } return PathSegment(type: command.absolute ? .M : .m, data: data) case .lineTo: var data = [Double]() separatedValues.forEach { value in if let double = Double(value) { data.append(double) } } if data.count < 2 { return .none } return PathSegment(type: command.absolute ? .L : .l, data: data) case .lineH: if separatedValues.count < 1 { return .none } guard let x = Double(separatedValues[0]) else { return .none } return PathSegment(type: command.absolute ? .H : .h, data: [x]) case .lineV: if separatedValues.count < 1 { return .none } guard let y = Double(separatedValues[0]) else { return .none } return PathSegment(type: command.absolute ? .V : .v, data: [y]) case .curveTo: var data = [Double]() separatedValues.forEach { value in if let double = Double(value) { data.append(double) } } if data.count < 6 { return .none } return PathSegment(type: command.absolute ? .C : .c, data: data) case .smoothCurveTo: var data = [Double]() separatedValues.forEach { value in if let double = Double(value) { data.append(double) } } if data.count < 4 { return .none } return PathSegment(type: command.absolute ? .S : .s, data: data) case .closePath: return PathSegment(type: .z) default: return .none } } fileprivate func separateNegativeValuesIfNeeded(_ expression: String) -> [String] { var values = [String]() var value = String() var e = false expression.unicodeScalars.forEach { scalar in if scalar == "e" { e = true } if scalar == "-" && !e { if !value.isEmpty { values.append(value) value = String() } e = false } value.append("\(scalar)") } if !value.isEmpty { values.append(value) } return values } fileprivate func isAbsolute(_ commandString: String) -> Bool { switch commandString { case SVGConstants.moveToAbsolute: return true case SVGConstants.moveToRelative: return false case SVGConstants.lineToAbsolute: return true case SVGConstants.lineToRelative: return false case SVGConstants.lineHorizontalAbsolute: return true case SVGConstants.lineHorizontalRelative: return false case SVGConstants.lineVerticalAbsolute: return true case SVGConstants.lineVerticalRelative: return false case SVGConstants.curveToAbsolute: return true case SVGConstants.curveToRelative: return false case SVGConstants.smoothCurveToAbsolute: return true case SVGConstants.smoothCurveToRelative: return false case SVGConstants.closePathAbsolute: return true case SVGConstants.closePathRelative: return false default: return true } } fileprivate func getCommandType(_ commandString: String) -> PathCommandType { switch commandString { case SVGConstants.moveToAbsolute: return .moveTo case SVGConstants.moveToRelative: return .moveTo case SVGConstants.lineToAbsolute: return .lineTo case SVGConstants.lineToRelative: return .lineTo case SVGConstants.lineVerticalAbsolute: return .lineV case SVGConstants.lineVerticalRelative: return .lineV case SVGConstants.lineHorizontalAbsolute: return .lineH case SVGConstants.lineHorizontalRelative: return .lineH case SVGConstants.curveToAbsolute: return .curveTo case SVGConstants.curveToRelative: return .curveTo case SVGConstants.smoothCurveToAbsolute: return .smoothCurveTo case SVGConstants.smoothCurveToRelative: return .smoothCurveTo case SVGConstants.closePathAbsolute: return .closePath case SVGConstants.closePathRelative: return .closePath default: return .none } } fileprivate func getDoubleValue(_ element: SWXMLHash.XMLElement, attribute: String) -> Double? { guard let attributeValue = element.allAttributes[attribute]?.text, let doubleValue = Double(attributeValue) else { return .none } return doubleValue } fileprivate func getDoubleValueFromPercentage(_ element: SWXMLHash.XMLElement, attribute: String) -> Double? { guard let attributeValue = element.allAttributes[attribute]?.text else { return .none } if !attributeValue.contains("%") { return self.getDoubleValue(element, attribute: attribute) } else { let value = attributeValue.replacingOccurrences(of: "%", with: "") if let doubleValue = Double(value) { return doubleValue / 100 } } return .none } fileprivate func getIntValue(_ element: SWXMLHash.XMLElement, attribute: String) -> Int? { guard let attributeValue = element.allAttributes[attribute]?.text, let intValue = Int(attributeValue) else { return .none } return intValue } fileprivate func getFontName(_ attributes: [String: String]) -> String? { return attributes["font-family"] } fileprivate func getFontSize(_ attributes: [String: String]) -> Int? { guard let fontSize = attributes["font-size"] else { return .none } if let size = Double(fontSize) { return (Int(round(size))) } return .none } fileprivate func getFontStyle(_ attributes: [String: String], style: String) -> Bool? { guard let fontStyle = attributes["font-style"] else { return .none } if fontStyle.lowercased() == style { return true } return false } fileprivate func getFontWeight(_ attributes: [String: String]) -> String? { guard let fontWeight = attributes["font-weight"] else { return .none } return fontWeight } fileprivate func getFontWeight(_ attributes: [String: String], style: String) -> Bool? { guard let fontWeight = attributes["font-weight"] else { return .none } if fontWeight.lowercased() == style { return true } return false } fileprivate func getTextAnchor(_ attributes: [String: String]) -> String? { guard let textAnchor = attributes["text-anchor"] else { return .none } return textAnchor } fileprivate func getTextDecoration(_ attributes: [String: String], decoration: String) -> Bool? { guard let textDecoration = attributes["text-decoration"] else { return .none } if textDecoration.contains(decoration) { return true } return false } fileprivate func copyNode(_ referenceNode: Node) -> Node? { let pos = referenceNode.place let opaque = referenceNode.opaque let visible = referenceNode.visible let clip = referenceNode.clip let tag = referenceNode.tag if let shape = referenceNode as? Shape { return Shape(form: shape.form, fill: shape.fill, stroke: shape.stroke, place: pos, opaque: opaque, clip: clip, visible: visible, tag: tag) } if let text = referenceNode as? Text { return Text(text: text.text, font: text.font, fill: text.fill, align: text.align, baseline: text.baseline, place: pos, opaque: opaque, clip: clip, visible: visible, tag: tag) } if let image = referenceNode as? Image { return Image(src: image.src, xAlign: image.xAlign, yAlign: image.yAlign, aspectRatio: image.aspectRatio, w: image.w, h: image.h, place: pos, opaque: opaque, clip: clip, visible: visible, tag: tag) } if let group = referenceNode as? Group { var contents = [Node]() group.contents.forEach { node in if let copy = copyNode(node) { contents.append(copy) } } return Group(contents: contents, place: pos, opaque: opaque, clip: clip, visible: visible, tag: tag) } return .none } fileprivate func degreesToRadians(_ degrees: Double) -> Double { return degrees * .pi / 180 } }