/
postcss-url-parser.js
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/
postcss-url-parser.js
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import postcss from 'postcss';
import valueParser from 'postcss-value-parser';
import { normalizeUrl } from '../utils';
const pluginName = 'postcss-url-parser';
const isUrlFunc = /url/i;
const isImageSetFunc = /^(?:-webkit-)?image-set$/i;
const needParseDecl = /(?:url|(?:-webkit-)?image-set)\(/i;
function getNodeFromUrlFunc(node) {
return node.nodes && node.nodes[0];
}
function walkUrls(parsed, callback) {
parsed.walk((node) => {
if (node.type !== 'function') {
return;
}
if (isUrlFunc.test(node.value)) {
const { nodes } = node;
const isStringValue = nodes.length !== 0 && nodes[0].type === 'string';
const url = isStringValue ? nodes[0].value : valueParser.stringify(nodes);
callback(getNodeFromUrlFunc(node), url, false, isStringValue);
// Do not traverse inside `url`
// eslint-disable-next-line consistent-return
return false;
}
if (isImageSetFunc.test(node.value)) {
node.nodes.forEach((nNode) => {
const { type, value } = nNode;
if (type === 'function' && isUrlFunc.test(value)) {
const { nodes } = nNode;
const isStringValue =
nodes.length !== 0 && nodes[0].type === 'string';
const url = isStringValue
? nodes[0].value
: valueParser.stringify(nodes);
callback(getNodeFromUrlFunc(nNode), url, false, isStringValue);
}
if (type === 'string') {
callback(nNode, value, true, true);
}
});
// Do not traverse inside `image-set`
// eslint-disable-next-line consistent-return
return false;
}
});
}
function getUrlsFromValue(value, result, filter, decl) {
if (!needParseDecl.test(value)) {
return;
}
const parsed = valueParser(value);
const urls = [];
walkUrls(parsed, (node, url, needQuotes, isStringValue) => {
if (url.trim().replace(/\\[\r\n]/g, '').length === 0) {
result.warn(`Unable to find uri in '${decl ? decl.toString() : value}'`, {
node: decl,
});
return;
}
if (filter && !filter(url)) {
return;
}
const splittedUrl = url.split(/(\?)?#/);
const [urlWithoutHash, singleQuery, hashValue] = splittedUrl;
const hash =
singleQuery || hashValue
? `${singleQuery ? '?' : ''}${hashValue ? `#${hashValue}` : ''}`
: '';
const normalizedUrl = normalizeUrl(urlWithoutHash, isStringValue);
urls.push({ node, url: normalizedUrl, hash, needQuotes });
});
// eslint-disable-next-line consistent-return
return { parsed, urls };
}
function walkDecls(css, result, filter) {
const items = [];
css.walkDecls((decl) => {
const item = getUrlsFromValue(decl.value, result, filter, decl);
if (!item || item.urls.length === 0) {
return;
}
items.push({ decl, parsed: item.parsed, urls: item.urls });
});
return items;
}
function flatten(array) {
return array.reduce((a, b) => a.concat(b), []);
}
function collectUniqueUrlsWithNodes(array) {
return array.reduce((accumulator, currentValue) => {
const { url, needQuotes, hash, node } = currentValue;
const found = accumulator.find(
(item) =>
url === item.url && needQuotes === item.needQuotes && hash === item.hash
);
if (!found) {
accumulator.push({ url, hash, needQuotes, nodes: [node] });
} else {
found.nodes.push(node);
}
return accumulator;
}, []);
}
export default postcss.plugin(
pluginName,
(options) =>
function process(css, result) {
const traversed = walkDecls(css, result, options.filter);
const flattenTraversed = flatten(traversed.map((item) => item.urls));
const urlsWithNodes = collectUniqueUrlsWithNodes(flattenTraversed);
const replacers = new Map();
urlsWithNodes.forEach((urlWithNodes, index) => {
const { url, hash, needQuotes, nodes } = urlWithNodes;
const replacementName = `___CSS_LOADER_URL_REPLACEMENT_${index}___`;
result.messages.push(
{
pluginName,
type: 'import',
value: { type: 'url', replacementName, url, needQuotes, hash },
},
{
pluginName,
type: 'replacer',
value: { type: 'url', replacementName },
}
);
nodes.forEach((node) => {
replacers.set(node, replacementName);
});
});
traversed.forEach((item) => {
walkUrls(item.parsed, (node) => {
const replacementName = replacers.get(node);
if (!replacementName) {
return;
}
// eslint-disable-next-line no-param-reassign
node.type = 'word';
// eslint-disable-next-line no-param-reassign
node.value = replacementName;
});
// eslint-disable-next-line no-param-reassign
item.decl.value = item.parsed.toString();
});
}
);