78 lines
3.7 KiB
JavaScript
78 lines
3.7 KiB
JavaScript
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import browserslist from 'browserslist';
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import postcss from 'postcss';
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var index = postcss.plugin('postcss-browser-comments', opts => root => {
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// client browserslist
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const clientBrowserList = browserslist(Object(opts).browsers || null, {
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path: root.source && root.source.input && root.source.input.file
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}); // root children references
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const references = root.nodes.slice(0); // for each child node of the root children references
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for (let node of references) {
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// if the node is a comment browser comment node
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if (isBrowserCommentNode(node)) {
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// rule following the browser comment
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const rule = node.next(); // browser data
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const browserdata = getBrowserData(node.text);
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if (browserdata.isNumbered) {
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rule.nodes.filter(isBrowserReferenceCommentNode).map(comment => {
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const browserdataIndex = parseFloat(comment.text) - 1;
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const browserslistPart = browserdata.browserslist[browserdataIndex]; // whether to remove the rule if the comment browserslist does not match the client browserslist
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const removeRule = !clientBrowserList.some(clientBrowser => browserslist(browserslistPart).some(commentBrowser => commentBrowser === clientBrowser)); // conditionally remove the declaration and reference comment
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if (removeRule) {
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comment.prev().remove();
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comment.remove();
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}
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}); // conditionally remove the empty rule and comment
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if (!rule.nodes.length) {
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rule.remove();
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node.remove();
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}
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} else {
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// whether to remove the rule if the comment browserslist does not match the client browserslist
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const removeRule = !clientBrowserList.some(clientBrowser => browserslist(browserdata.browserslist).some(commentBrowser => commentBrowser === clientBrowser)); // conditionally remove the rule and comment
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if (removeRule) {
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rule.remove();
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node.remove();
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}
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}
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}
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}
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}); // returns whether a node is a browser comment
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const isBrowserCommentNode = node => node.type === 'comment' && isBrowserCommentNodeRegExp.test(node.text) && node.next().type === 'rule';
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const isBrowserCommentNodeRegExp = /^\*\n * /; // returns whether a node is a browser reference comment
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const isBrowserReferenceCommentNode = node => node.type === 'comment' && isBrowserReferenceCommentNodeRegExp.test(node.text);
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const isBrowserReferenceCommentNodeRegExp = /^\d+$/; // returns browser data from comment text
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const getBrowserData = text => {
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const browserDataNumbered = text.match(browserDataMutliRegExp);
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const isNumbered = Boolean(browserDataNumbered);
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return {
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browserslist: isNumbered ? browserDataNumbered.map(browserslistPart => getBrowsersList(browserslistPart.replace(browserDataNumberedNewlineRegExp, '$1'))) : getBrowsersList(text.replace(browserDataNewlineRegExp, '')),
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isNumbered
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};
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};
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const browserDataMutliRegExp = /(\n \* \d+\. (?:[^\n]+|\n \* {4,})+)/g;
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const browserDataNewlineRegExp = /^\*\n \* ?|\n \*/g;
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const browserDataNumberedNewlineRegExp = /\n \* (?:( )\s*)?/g; // returns a browserlist from comment text
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const getBrowsersList = text => text.split(getBrowsersListInSplitRegExp).slice(1).map(part => part.split(getBrowsersListAndSplitRegExp).filter(part2 => part2)).reduce((acc, val) => acc.concat(val), []).map(part => part.replace(getBrowsersListQueryRegExp, ($0, browser, query) => browser === 'all' ? '> 0%' : `${browser}${query ? /^((?:\d*\.)?\d+)-$/.test(query) ? ` <= ${query.slice(0, -1)}` : ` ${query}` : ' > 0'}`).toLowerCase());
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const getBrowsersListInSplitRegExp = /\s+in\s+/;
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const getBrowsersListAndSplitRegExp = /(?: and|, and|,)/;
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const getBrowsersListQueryRegExp = /^\s*(\w+)(?: ((?:(?:\d*\.)?\d+-)?(?:\d*\.)?\d+[+-]?))?.*$/;
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export default index;
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