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| 1 | +// |
| 2 | +// File.swift |
| 3 | +// |
| 4 | +// |
| 5 | +// Created by narongrit kanhanoi on 19/3/2565 BE. |
| 6 | +// |
| 7 | + |
| 8 | +import Foundation |
| 9 | + |
| 10 | +public class PView { |
| 11 | + var props: [String: String] = [:] |
| 12 | + |
| 13 | + public func describe()->String{ |
| 14 | + var r = "" |
| 15 | + if self is PImage { |
| 16 | + r += "Image\n" |
| 17 | + }else if self is PContainer { |
| 18 | + r += "Container\n" |
| 19 | + }else if self is PText { |
| 20 | + r += "TextView\n" |
| 21 | + } |
| 22 | + for (k,v) in props{ |
| 23 | + r += "\t\(k)=\(v)\n" |
| 24 | + } |
| 25 | + return r |
| 26 | + } |
| 27 | + |
| 28 | + public func createView(parser: FlexParser) -> UIView { |
| 29 | + return UIView() |
| 30 | + } |
| 31 | + |
| 32 | +} |
| 33 | + |
| 34 | +public class PContainer: PView{ |
| 35 | + var childs:[PView] = [] |
| 36 | + func appendChild(e: PView){ |
| 37 | + childs.append(e) |
| 38 | + } |
| 39 | + |
| 40 | + override public func describe()->String{ |
| 41 | + var r = super.describe() |
| 42 | + for v in childs{ |
| 43 | + r += v.describe() |
| 44 | + } |
| 45 | + return r |
| 46 | + } |
| 47 | + |
| 48 | + public override func createView(parser: FlexParser) -> UIView { |
| 49 | + let view = UIStackView() |
| 50 | + view.distribution = .fill |
| 51 | + view.axis = .vertical |
| 52 | + |
| 53 | + view.frame = parser.containerSize ?? |
| 54 | + CGRect(x: 0, y: 0, width: 300, height: 300) |
| 55 | + |
| 56 | + for v in childs { |
| 57 | + let subView = v.createView(parser: parser) |
| 58 | + print(subView) |
| 59 | + view.addArrangedSubview(subView) |
| 60 | + } |
| 61 | + |
| 62 | + return view |
| 63 | + } |
| 64 | +} |
| 65 | + |
| 66 | +public class PImage: PView { |
| 67 | + override public func createView(parser: FlexParser) -> UIView { |
| 68 | + let view = UIImageView() |
| 69 | + view.backgroundColor = .red |
| 70 | + if let urlStr = props["src"] { |
| 71 | + if let url = URL(string: urlStr){ |
| 72 | + let req = URLRequest(url: url) |
| 73 | + URLSession.shared.dataTask(with: req) { data, res, err in |
| 74 | + if let data = data { |
| 75 | + if let img = UIImage(data: data) { |
| 76 | + view.image = UIImage(data: data) |
| 77 | + view.frame = CGRect(x: view.frame.minX, y: view.frame.minY, width: img.size.width, height: img.size.height) |
| 78 | + |
| 79 | + DispatchQueue.main.async { |
| 80 | + |
| 81 | + view.widthAnchor.constraint(equalToConstant: img.size.width).isActive = true |
| 82 | + view.heightAnchor.constraint(equalToConstant: img.size.height).isActive = true |
| 83 | + } |
| 84 | + } |
| 85 | + } |
| 86 | + }.resume() |
| 87 | + } |
| 88 | + } |
| 89 | + |
| 90 | + |
| 91 | + |
| 92 | + return view |
| 93 | + } |
| 94 | +} |
| 95 | + |
| 96 | +public class PText: PView { |
| 97 | + override public func createView(parser: FlexParser) -> UIView { |
| 98 | + let view = UILabel() |
| 99 | + view.numberOfLines = 3 |
| 100 | + view.text = props["text"] ?? "" |
| 101 | + let size = props["size"]?.CGFloatValue() ?? 0 |
| 102 | + view.font = UIFont.systemFont(ofSize: size) |
| 103 | + view.sizeToFit() |
| 104 | + |
| 105 | + view.widthAnchor.constraint(equalToConstant: view.frame.size.width).isActive = true |
| 106 | + view.heightAnchor.constraint(equalToConstant: view.frame.size.height).isActive = true |
| 107 | + |
| 108 | + return view |
| 109 | + } |
| 110 | +} |
| 111 | + |
| 112 | +public enum TextSize: String{ |
| 113 | + case body = "body" |
| 114 | + case title = "title" |
| 115 | +} |
| 116 | +public class FlexParser { |
| 117 | + |
| 118 | + public static let shared = FlexParser() |
| 119 | + |
| 120 | + var textSize: [String: Int] = [ |
| 121 | + "body": 14, |
| 122 | + "title": 18 |
| 123 | + ] |
| 124 | + |
| 125 | + var containerSize: CGRect? |
| 126 | + |
| 127 | + public func setTextSize(for name: TextSize, size: Int){ |
| 128 | + textSize[name.rawValue] = size |
| 129 | + } |
| 130 | + |
| 131 | + public func getTextSize(_ name: TextSize) -> Int { |
| 132 | + return textSize[name.rawValue] ?? 6 |
| 133 | + } |
| 134 | + |
| 135 | + public func parse(flex: String) -> PView? { |
| 136 | + let flex = removingWhitespaces(flex) |
| 137 | + var buffer = "" |
| 138 | + var root: PContainer? |
| 139 | + var currentElement: PView? |
| 140 | + |
| 141 | + var propName = "" |
| 142 | + var startProp = false |
| 143 | + for c in flex { |
| 144 | + if c == "(" { |
| 145 | + |
| 146 | + let e = createElement(type: buffer) |
| 147 | + if buffer == "root" { |
| 148 | + root = e as? PContainer |
| 149 | + }else{ |
| 150 | + root?.appendChild(e: e) |
| 151 | + } |
| 152 | + currentElement = e |
| 153 | + buffer = "" |
| 154 | + }else if c == "=" { |
| 155 | + propName = buffer |
| 156 | + buffer = "" |
| 157 | + }else if c == "\"" { |
| 158 | + if !startProp { |
| 159 | + startProp = true |
| 160 | + }else{ |
| 161 | + startProp = false |
| 162 | + var _size = buffer |
| 163 | + if currentElement is PText && propName == "size" { |
| 164 | + let k = TextSize.init(rawValue: buffer) ?? .body |
| 165 | + let size = getTextSize(k) |
| 166 | + _size = String(describing:size) |
| 167 | + } |
| 168 | + |
| 169 | + currentElement?.props[propName] = _size |
| 170 | + buffer = "" |
| 171 | + } |
| 172 | + }else if c == ")" { |
| 173 | + currentElement = nil |
| 174 | + buffer = "" |
| 175 | + }else{ |
| 176 | + buffer.append(c) |
| 177 | + } |
| 178 | + } |
| 179 | + return root |
| 180 | + } |
| 181 | + |
| 182 | + func createElement(type: String) -> PView { |
| 183 | + if type == "root" { |
| 184 | + return PContainer() |
| 185 | + }else if type == "image" { |
| 186 | + return PImage() |
| 187 | + }else if type == "text" { |
| 188 | + return PText() |
| 189 | + } |
| 190 | + return PView() |
| 191 | + } |
| 192 | + |
| 193 | + public func createView(pView: PContainer?, frame: CGRect? = nil) -> UIView? { |
| 194 | + containerSize = frame |
| 195 | + let root = pView?.createView(parser: self) |
| 196 | + return root |
| 197 | + } |
| 198 | + |
| 199 | + private func removingWhitespaces(_ str:String) -> String { |
| 200 | + return str.filter { s in |
| 201 | + if s != " " && s != "\n" { |
| 202 | + return true |
| 203 | + } |
| 204 | + return false |
| 205 | + } |
| 206 | + } |
| 207 | +} |
| 208 | + |
| 209 | +extension String { |
| 210 | + |
| 211 | + func CGFloatValue() -> CGFloat? { |
| 212 | + guard let doubleValue = Double(self) else { |
| 213 | + return nil |
| 214 | + } |
| 215 | + |
| 216 | + return CGFloat(doubleValue) |
| 217 | + } |
| 218 | +} |
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