41 lines
1.0 KiB
JavaScript
41 lines
1.0 KiB
JavaScript
'use strict';
|
|
|
|
// eslint-disable-next-line no-var
|
|
var colorParser = (() => {
|
|
const el = document.createElement('div');
|
|
// https://bugs.webkit.org/show_bug.cgi?id=14563
|
|
document.head.appendChild(el);
|
|
|
|
function parseRGB(color) {
|
|
const [r, g, b, a = 1] = color.match(/[.\d]+/g).map(Number);
|
|
return {r, g, b, a};
|
|
}
|
|
|
|
function parse(color) {
|
|
el.style.color = color;
|
|
if (el.style.color === '') {
|
|
throw new Error(chrome.i18n.getMessage('styleMetaErrorColor', color));
|
|
}
|
|
color = getComputedStyle(el).color;
|
|
el.style.color = '';
|
|
return parseRGB(color);
|
|
}
|
|
|
|
function format({r, g, b, a = 1}) {
|
|
if (a === 1) {
|
|
return `rgb(${r}, ${g}, ${b})`;
|
|
}
|
|
return `rgba(${r}, ${g}, ${b}, ${a})`;
|
|
}
|
|
|
|
function formatHex({r, g, b, a = null}) {
|
|
let hex = '#' + (0x1000000 + (r << 16) + (g << 8) + (b | 0)).toString(16).substr(1);
|
|
if (a !== null) {
|
|
hex += (0x100 + Math.floor(a * 255)).toString(16).substr(1);
|
|
}
|
|
return hex;
|
|
}
|
|
|
|
return {parse, format, formatHex};
|
|
})();
|