/
postcss-import-parser.js
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postcss-import-parser.js
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const postcss = require('postcss');
const valueParser = require('postcss-value-parser');
const loaderUtils = require('loader-utils');
const pluginName = 'postcss-import-parser';
function getArg(nodes) {
return nodes.length !== 0 && nodes[0].type === 'string'
? nodes[0].value
: valueParser.stringify(nodes);
}
function getUrl(node) {
if (node.type === 'function' && node.value.toLowerCase() === 'url') {
return getArg(node.nodes);
}
if (node.type === 'string') {
return node.value;
}
return '';
}
function parseImport(params) {
const { nodes } = valueParser(params);
if (nodes.length === 0) {
return null;
}
const url = getUrl(nodes[0]);
if (url.trim().length === 0) {
return null;
}
return {
url,
media: valueParser.stringify(nodes.slice(1)).trim(),
};
}
module.exports = postcss.plugin(
pluginName,
(options) =>
function process(css, result) {
const importItems = [];
css.walkAtRules(/^import$/i, (atrule) => {
// Convert only top-level @import
if (atrule.parent.type !== 'root') {
return;
}
if (atrule.nodes) {
result.warn(
"It looks like you didn't end your @import statement correctly. " +
'Child nodes are attached to it.',
{ node: atrule }
);
return;
}
const parsed = parseImport(atrule.params);
if (!parsed) {
// eslint-disable-next-line consistent-return
return result.warn(`Unable to find uri in '${atrule.toString()}'`, {
node: atrule,
});
}
let { url } = parsed;
if (loaderUtils.isUrlRequest(url)) {
url = loaderUtils.urlToRequest(url);
}
importItems.push({ url, mediaQuery: parsed.media });
atrule.remove();
});
// eslint-disable-next-line no-param-reassign
options.importItems = importItems;
}
);