/
postcss-import-parser.js
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/
postcss-import-parser.js
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import valueParser from "postcss-value-parser";
import {
normalizeUrl,
resolveRequests,
isUrlRequestable,
requestify,
WEBPACK_IGNORE_COMMENT_REGEXP,
} from "../utils";
function parseNode(atRule, key) {
// Convert only top-level @import
if (atRule.parent.type !== "root") {
return;
}
if (
atRule.raws &&
atRule.raws.afterName &&
atRule.raws.afterName.trim().length > 0
) {
const lastCommentIndex = atRule.raws.afterName.lastIndexOf("/*");
const matched = atRule.raws.afterName
.slice(lastCommentIndex)
.match(WEBPACK_IGNORE_COMMENT_REGEXP);
if (matched && matched[2] === "true") {
return;
}
}
const prevNode = atRule.prev();
if (prevNode && prevNode.type === "comment") {
const matched = prevNode.text.match(WEBPACK_IGNORE_COMMENT_REGEXP);
if (matched && matched[2] === "true") {
return;
}
}
// Nodes do not exists - `@import url('http://') :root {}`
if (atRule.nodes) {
const error = new Error(
"It looks like you didn't end your @import statement correctly. Child nodes are attached to it."
);
error.node = atRule;
throw error;
}
const { nodes: paramsNodes } = valueParser(atRule[key]);
// No nodes - `@import ;`
// Invalid type - `@import foo-bar;`
if (
paramsNodes.length === 0 ||
(paramsNodes[0].type !== "string" && paramsNodes[0].type !== "function")
) {
const error = new Error(`Unable to find uri in "${atRule.toString()}"`);
error.node = atRule;
throw error;
}
let isStringValue;
let url;
if (paramsNodes[0].type === "string") {
isStringValue = true;
url = paramsNodes[0].value;
} else {
// Invalid function - `@import nourl(test.css);`
if (paramsNodes[0].value.toLowerCase() !== "url") {
const error = new Error(`Unable to find uri in "${atRule.toString()}"`);
error.node = atRule;
throw error;
}
isStringValue =
paramsNodes[0].nodes.length !== 0 &&
paramsNodes[0].nodes[0].type === "string";
url = isStringValue
? paramsNodes[0].nodes[0].value
: valueParser.stringify(paramsNodes[0].nodes);
}
url = normalizeUrl(url, isStringValue);
const isRequestable = isUrlRequestable(url);
let prefix;
if (isRequestable) {
const queryParts = url.split("!");
if (queryParts.length > 1) {
url = queryParts.pop();
prefix = queryParts.join("!");
}
}
// Empty url - `@import "";` or `@import url();`
if (url.trim().length === 0) {
const error = new Error(`Unable to find uri in "${atRule.toString()}"`);
error.node = atRule;
throw error;
}
const mediaNodes = paramsNodes.slice(1);
let media;
if (mediaNodes.length > 0) {
media = valueParser.stringify(mediaNodes).trim().toLowerCase();
}
// eslint-disable-next-line consistent-return
return { atRule, prefix, url, media, isRequestable };
}
const plugin = (options = {}) => {
return {
postcssPlugin: "postcss-import-parser",
prepare(result) {
const parsedAtRules = [];
return {
AtRule: {
import(atRule) {
let parsedAtRule;
try {
parsedAtRule = parseNode(atRule, "params", result);
} catch (error) {
result.warn(error.message, { node: error.node });
}
if (!parsedAtRule) {
return;
}
parsedAtRules.push(parsedAtRule);
},
},
async OnceExit() {
if (parsedAtRules.length === 0) {
return;
}
const resolvedAtRules = await Promise.all(
parsedAtRules.map(async (parsedAtRule) => {
const {
atRule,
isRequestable,
prefix,
url,
media,
} = parsedAtRule;
if (options.filter) {
const needKeep = await options.filter(url, media);
if (!needKeep) {
return;
}
}
if (isRequestable) {
const request = requestify(url, options.rootContext);
const { resolver, context } = options;
const resolvedUrl = await resolveRequests(resolver, context, [
...new Set([request, url]),
]);
if (!resolvedUrl) {
return;
}
atRule.remove();
// eslint-disable-next-line consistent-return
return { url: resolvedUrl, media, prefix, isRequestable };
}
atRule.remove();
// eslint-disable-next-line consistent-return
return { url, media, prefix, isRequestable };
})
);
const urlToNameMap = new Map();
for (let index = 0; index <= resolvedAtRules.length - 1; index++) {
const resolvedAtRule = resolvedAtRules[index];
if (!resolvedAtRule) {
// eslint-disable-next-line no-continue
continue;
}
const { url, isRequestable, media } = resolvedAtRule;
if (!isRequestable) {
options.api.push({ url, media, index });
// eslint-disable-next-line no-continue
continue;
}
const { prefix } = resolvedAtRule;
const newUrl = prefix ? `${prefix}!${url}` : url;
let importName = urlToNameMap.get(newUrl);
if (!importName) {
importName = `___CSS_LOADER_AT_RULE_IMPORT_${urlToNameMap.size}___`;
urlToNameMap.set(newUrl, importName);
options.imports.push({
importName,
url: options.urlHandler(newUrl),
index,
});
}
options.api.push({ importName, media, index });
}
},
};
},
};
};
plugin.postcss = true;
export default plugin;