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perf: improve parse performance for url() functions
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@evilebottnawi
evilebottnawi committed Mar 20, 2020
1 parent f5f21ea commit fe0e6c9
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Showing 2 changed files with 83 additions and 137 deletions.
164 changes: 58 additions & 106 deletions src/plugins/postcss-url-parser.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -59,128 +59,80 @@ function walkUrls(parsed, callback) {
});
}

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;
}
export default postcss.plugin(pluginName, (options) => (css, result) => {
const importsMap = new Map();
const replacersMap = new Map();

if (filter && !filter(url)) {
css.walkDecls((decl) => {
if (!needParseDecl.test(decl.value)) {
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 = [];
const parsed = valueParser(decl.value);

css.walkDecls((decl) => {
const item = getUrlsFromValue(decl.value, result, filter, decl);
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() : decl.value}'`,
{ node: decl }
);

if (!item || item.urls.length === 0) {
return;
}
return;
}

items.push({ decl, parsed: item.parsed, urls: item.urls });
});
if (options.filter && !options.filter(url)) {
return;
}

return items;
}
const splittedUrl = url.split(/(\?)?#/);
const [urlWithoutHash, singleQuery, hashValue] = splittedUrl;
const hash =
singleQuery || hashValue
? `${singleQuery ? '?' : ''}${hashValue ? `#${hashValue}` : ''}`
: '';

function flatten(array) {
return array.reduce((a, b) => a.concat(b), []);
}
const normalizedUrl = normalizeUrl(urlWithoutHash, isStringValue);

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);
}
const importKey = normalizedUrl;
let importName = importsMap.get(importKey);

return accumulator;
}, []);
}
if (!importName) {
importName = `___CSS_LOADER_URL_IMPORT_${importsMap.size}___`;
importsMap.set(importKey, importName);

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 },
result.messages.push({
pluginName,
type: 'import',
value: {
type: 'url',
importName,
url: normalizedUrl,
},
{
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);
const replacerKey = JSON.stringify({ importKey, hash, needQuotes });

if (!replacementName) {
return;
}
let replacerName = replacersMap.get(replacerKey);

// eslint-disable-next-line no-param-reassign
node.type = 'word';
// eslint-disable-next-line no-param-reassign
node.value = replacementName;
if (!replacerName) {
replacerName = `___CSS_LOADER_URL_REPLACEMENT_${replacersMap.size}___`;
replacersMap.set(replacerKey, replacerName);

result.messages.push({
pluginName,
type: 'replacer',
value: { type: 'url', replacerName, importName, hash, needQuotes },
});
}

// eslint-disable-next-line no-param-reassign
item.decl.value = item.parsed.toString();
});
}
);
// eslint-disable-next-line no-param-reassign
node.type = 'word';
// eslint-disable-next-line no-param-reassign
node.value = replacerName;
});

// eslint-disable-next-line no-param-reassign
decl.value = parsed.toString();
});
});
56 changes: 25 additions & 31 deletions src/utils.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -206,8 +206,8 @@ function getImportCode(
const importItems = [];
const codeItems = [];
const atRuleImportNames = new Map();
const urlImportNames = new Map();

let hasUrlHelper = false;
let importPrefix;

if (exportType === 'full') {
Expand Down Expand Up @@ -273,7 +273,7 @@ function getImportCode(
break;
case 'url':
{
if (urlImportNames.size === 0) {
if (!hasUrlHelper) {
const helperUrl = stringifyRequest(
loaderContext,
require.resolve('./runtime/getUrl.js')
Expand All @@ -284,33 +284,16 @@ function getImportCode(
? `import ___CSS_LOADER_GET_URL_IMPORT___ from ${helperUrl};`
: `var ___CSS_LOADER_GET_URL_IMPORT___ = require(${helperUrl});`
);
hasUrlHelper = true;
}

const { replacementName, url, hash, needQuotes } = item;
const { importName, url } = item;
const importUrl = stringifyRequest(loaderContext, url);

let importName = urlImportNames.get(url);

if (!importName) {
const importUrl = stringifyRequest(loaderContext, url);

importName = `___CSS_LOADER_URL_IMPORT_${urlImportNames.size}___`;
importItems.push(
esModule
? `import ${importName} from ${importUrl};`
: `var ${importName} = require(${importUrl});`
);

urlImportNames.set(url, importName);
}

const getUrlOptions = []
.concat(hash ? [`hash: ${JSON.stringify(hash)}`] : [])
.concat(needQuotes ? 'needQuotes: true' : []);
const preparedOptions =
getUrlOptions.length > 0 ? `, { ${getUrlOptions.join(', ')} }` : '';

codeItems.push(
`var ${replacementName} = ___CSS_LOADER_GET_URL_IMPORT___(${importName}${preparedOptions});`
importItems.push(
esModule
? `import ${importName} from ${importUrl};`
: `var ${importName} = require(${importUrl});`
);
}
break;
Expand Down Expand Up @@ -359,19 +342,30 @@ function getModuleCode(
const sourceMapValue = sourceMap && map ? `,${map}` : '';

let cssCode = JSON.stringify(css);
let replacersCode = '';

replacers.forEach((replacer) => {
const { type, replacementName } = replacer;
const { type } = replacer;

if (type === 'url') {
const { replacerName, importName, hash, needQuotes } = replacer;

const getUrlOptions = []
.concat(hash ? [`hash: ${JSON.stringify(hash)}`] : [])
.concat(needQuotes ? 'needQuotes: true' : []);
const preparedOptions =
getUrlOptions.length > 0 ? `, { ${getUrlOptions.join(', ')} }` : '';

replacersCode += `var ${replacerName} = ___CSS_LOADER_GET_URL_IMPORT___(${importName}${preparedOptions});\n`;

cssCode = cssCode.replace(
new RegExp(replacementName, 'g'),
() => `" + ${replacementName} + "`
new RegExp(replacerName, 'g'),
() => `" + ${replacerName} + "`
);
}

if (type === 'icss-import') {
const { importName, localName } = replacer;
const { importName, localName, replacementName } = replacer;

cssCode = cssCode.replace(
new RegExp(replacementName, 'g'),
Expand All @@ -380,7 +374,7 @@ function getModuleCode(
}
});

return `// Module\nexports.push([module.id, ${cssCode}, ""${sourceMapValue}]);\n`;
return `${replacersCode}// Module\nexports.push([module.id, ${cssCode}, ""${sourceMapValue}]);\n`;
}

function dashesCamelCase(str) {
Expand Down

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