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'use strict';
const postcss = require('postcss');
module.exports = postcss.plugin('postcss-hexrgba', () => {
/**
* Hex to RGB converter
* @param {string} hex hexidecimal string without #
* @return {array} RGB values
*/
function hexRgb(hex){
let shorthandCheck = /^([a-f\d])([a-f\d])([a-f\d])$/i,
rgbRegex = /^([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i,
rgb;
hex = hex.replace(shorthandCheck, function(m, r, g, b) {
return r + r + g + g + b + b;
});
rgb = hex.replace(/^\s+|\s+$/g, '').match(rgbRegex);
// Convert it
return rgb ? [
parseInt(rgb[1], 16),
parseInt(rgb[2], 16),
parseInt(rgb[3], 16)
] : false;
}
/**
* CSS rule handler
* @param {string} decl CSS delcaration
*/
function ruleHandler(decl, result) {
let input = decl.value;
// Get the raw hex values and replace them
let output = input.replace(/rgba\(#(.*?),/g, (match, hex) => {
let rgb = hexRgb(hex),
matchHex = new RegExp('#' + hex);
// If conversion fails, emit a warning
if (!rgb) {
result.warn('not a valid hex', { node: decl });
return match;
}
rgb = rgb.toString();
return match.replace(matchHex, rgb);
});
decl.value = output;
}
return function(css, result) {
css.walkDecls(decl => {
if (typeof decl.value === 'undefined' || decl.value.indexOf('rgba') === -1) {
return;
}
ruleHandler(decl, result);
});
};
});
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