HColorSet.java
/* ========================================================================
* PlantUML : a free UML diagram generator
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* (C) Copyright 2009-2024, Arnaud Roques
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* Original Author: Arnaud Roques
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package net.sourceforge.plantuml.klimt.color;
import java.awt.Color;
import java.util.Collection;
import java.util.Collections;
public class HColorSet {
private final static HColorSet singleton = new HColorSet();
public static HColorSet instance() {
return singleton;
}
public Collection<String> names() {
return Collections.unmodifiableCollection(ColorTrieNode.NAMES);
}
private HColorSet() {
}
public HColor getColorOrWhite(String s) {
final HColor result = parseColor(s);
if (result == null)
return HColors.WHITE;
return result;
}
public HColor getColor(String s) throws NoSuchColorException {
final HColor result = parseColor(s);
if (result == null)
throw new NoSuchColorException();
return result;
}
private HColor parseColor(String s) {
if (s.startsWith("#"))
s = s.substring(1);
if (s.equalsIgnoreCase("transparent") || s.equalsIgnoreCase("background"))
return HColors.none();
if (s.equalsIgnoreCase("automatic"))
return new HColorAutomagic();
if (s.equalsIgnoreCase("transparent"))
return HColors.simple(new Color(0, 0, 0, 0));
final Color result = parseSimpleColor(s);
if (result != null)
return HColors.simple(result);
if (s.startsWith("?")) {
final String[] colors = s.substring(1).split(":");
if (colors.length == 2 || colors.length == 3) {
final Color col0 = parseSimpleColor(colors[0]);
final Color col1 = parseSimpleColor(colors[1]);
if (colors.length == 2 && col0 != null && col1 != null)
return new HColorScheme(HColors.simple(col0), HColors.simple(col1), null);
final Color col2 = parseSimpleColor(colors[2]);
if (col2 != null)
return new HColorScheme(HColors.simple(col0), HColors.simple(col1), HColors.simple(col2));
}
}
for (int i = 0; i < s.length(); i++) {
final char c = s.charAt(i);
if (c == '-' || c == '\\' || c == '|' || c == '/') {
final Color col0 = parseSimpleColor(s.substring(0, i));
final Color col1 = parseSimpleColor(s.substring(i + 1));
if (col0 != null && col1 != null)
return HColors.gradient(HColors.simple(col0), HColors.simple(col1), c);
}
}
return null;
}
private Color parseSimpleColor(String s) {
if (s.startsWith("#"))
s = s.substring(1);
final int len = s.length();
if (len == 1) {
final int d = hexNibble(s.charAt(0));
if (d >= 0) {
final int v = (d << 4) | d;
final int rgb = (v << 16) | (v << 8) | v;
return new Color(rgb);
}
} else if (len == 3) {
final int r = hexNibble(s.charAt(0));
final int g = hexNibble(s.charAt(1));
final int b = hexNibble(s.charAt(2));
if (r >= 0 && g >= 0 && b >= 0) {
final int rr = (r << 4) | r;
final int gg = (g << 4) | g;
final int bb = (b << 4) | b;
final int rgb = (rr << 16) | (gg << 8) | bb;
return new Color(rgb);
}
} else if (len == 6) {
final int rgb = parseHex24(s, 0);
if (rgb >= 0)
return new Color(rgb);
} else if (len == 8) {
// https://forum.plantuml.net/11606/full-opacity-alpha-compositing-support-for-svg-and-png
final int r = parseHexByte(s, 0);
final int g = parseHexByte(s, 2);
final int b = parseHexByte(s, 4);
final int a = parseHexByte(s, 6);
if (r >= 0 && g >= 0 && b >= 0 && a >= 0)
return new Color(r, g, b, a);
}
return ColorTrieNode.INSTANCE.getColor(s);
}
private static int hexNibble(char c) {
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
else
return -1;
}
private static int parseHexByte(CharSequence s, int off) {
final int hi = hexNibble(s.charAt(off));
final int lo = hexNibble(s.charAt(off + 1));
return (hi | lo) < 0 ? -1 : ((hi << 4) | lo);
}
private static int parseHex24(CharSequence s, int off) {
final int r = parseHexByte(s, off);
final int g = parseHexByte(s, off + 2);
final int b = parseHexByte(s, off + 4);
return (r | g | b) < 0 ? -1 : ((r << 16) | (g << 8) | b);
}
}