scancss/dist/handlers/atrules/handleSupports/index.js

A robust CSS stylesheet statistics collector and analyzer

'use strict';

Object.defineProperty(exports, "__esModule", {
	value: true
});
exports.handleSupports = handleSupports;

var _cssBrowserHacks = require('../../../constants/cssBrowserHacks');

var _rePrefixedString = require('../../../constants/rePrefixedString');

var _countUsage = require('../../../calculators/countUsage');

var _handleVendorPrefix = require('../../handleVendorPrefix');

const cssSupportsBrowserHacks = _cssBrowserHacks.cssBrowserHacks.filter(hack => hack.type === 'supports');

const rePropertyValuePair = /\(\s*(([-a-zA-Z]+):\s*(.+?))\s*\)/g;

function handleSupports(atRule, report, options) {
	if (rePropertyValuePair.test(atRule.params)) {
		atRule.params.match(rePropertyValuePair).map(pair => pair.slice(1, -1).trim()).forEach(pair => {
			if (_rePrefixedString.rePrefixedString.test(pair)) {
				(0, _handleVendorPrefix.handleVendorPrefix)(pair, report);
			}
		});
	}

	if (options.browserHacks) {
		cssSupportsBrowserHacks.forEach(hack => {
			if (hack.regex.test(atRule.params)) {
				atRule.params.match(hack.regex).forEach(match => {
					report.browserHacks.total++;
					(0, _countUsage.countUsage)(match, report.browserHacks.usage.supports);
				});
			}
		});
	}
}