Question

Task In this challenge you parse RGB colors represented by strings. The formats are primarily used in HTML and CSS. Your task is to implement a function which takes a color as a string and returns the parsed color as a map (see Examples). Input represents one of the following: color The input string 1.6-digit hexadecimal "#RRGGBB" - Each pair of digits represents a value of the channel in hexadecimal: 00 to FF 2.3-digit hexadecimal "#RGB" - Each digit represents a value 0 to F which translates to 2- digit hexadecimal: 0>00, 1 11, 2->22, and so on. 3. Preset color name You have to use the predefined map PRESET_COLORS (Ruby, Python, JavaScript), presetColorsHaskell), or preset- colors (Clojure). The keys are the names of preset colors in lower- case and the values are the corresponding colors in 6-digit hexadecimal (same as 1. "#RRGGBB" ). Specification Challenge.parseHtml Colo r(colo r) Takes a String that represents a color and returns the parsed color as a map. Parameters color: String-A color represented by color name, 3- digit hexadecimal or 6-digit hexadecimal Return Value HashMap-Aset of numerical RGB values Examples color Return Value "#80FFA0" {"r":128,"g":255," b":160) "# 3B7" {"r":51,"g":187,"b ":119) "LimeGreen" ("r":50,"g":205 , "b ":50) import java.util . Map; public class HtmlColorParser private final Map presetColors ; public HtmlColorParser ( Map presetColors) presetColors; this.presetColors } public RGB parse (String color) { return new RGB (0, 128, 255); }

Answer 1

import java.util.HashMap; import java.util.Map; public class HtmlColorParser { private final Map<String, String> presetColors; //Initializing preset color in map public HtmlColorParser(Map<String, String> presetColors) { this.presetColors = presetColors; } //parsing color string public RGB parse(String colorString) throws Exception { //when hex code used if (colorString.startsWith("#")) { String colorValue = colorString.substring(1); String reformattedValue = reformatColorValue(colorValue); return getRgb(reformattedValue); } //when preset colors used if (presetColors.containsKey(colorString.toLowerCase())) { return getRgb(this.presetColors.get(colorString.toLowerCase()).substring(1)); } throw new Exception("Invalid color"); } private String reformatColorValue(String colorValue) { if (colorValue.length() == 6) { return colorValue; } return getDoubleString(colorValue.substring(0, 1)) + getDoubleString(colorValue.substring(1, 2)) + getDoubleString(colorValue.substring(2, 3)); } private String getDoubleString(String str) { return str + str; } //parsing logic private RGB getRgb(String colorString) { int red = Integer.parseInt(colorString.substring(0, 2), 16); int green = Integer.parseInt(colorString.substring(2, 4), 16); int blue = Integer.parseInt(colorString.substring(4, 6), 16); return new RGB(red, green, blue); } public static void main(String args[]) { Map<String, String> presetColor = new HashMap<>(); presetColor.put("limegreen", "#32CD32"); presetColor.put("green", "#008000"); presetColor.put("blue", "#0000FF"); presetColor.put("red", "#FF0000"); presetColor.put("black", "#000000"); presetColor.put("white", "#FFFFFF"); try { HtmlColorParser htmlColorParser = new HtmlColorParser(presetColor); System.out.println("#80FFA0: " + htmlColorParser.parse("#80FFA0")); System.out.println("#3B7: " + htmlColorParser.parse("#3B7")); System.out.println("LimeGreen: " + htmlColorParser.parse("LimeGreen")); System.out.println("Blue: " + htmlColorParser.parse("Blue")); System.out.println("Red: " + htmlColorParser.parse("red")); } catch (Exception e) { System.out.println("One of the color is invalid"); } } } class RGB { private final int r; private final int b; private final int g; RGB(int r, int b, int g) { this.r = r; this.b = b; this.g = g; } @Override public String toString() { return "{" + "r:" + r + ", b:" + b + ", g:" + g + '}'; } }

/Library/Java/JavaVirtualMachines/openjdk-12.0.1.jdk/Contents/H #80FFA0: {r:128, b:255, g:160} #3B7: {r:51, b:187, g:119} LimeGreen: {r:50, b:205, g:50} Blue: {r:0, b:0, g:255} Red: {r:255, b:0, g:0} Process finished with exit code 0