/
utils.js
348 lines (293 loc) · 8.94 KB
/
utils.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
import path from 'path';
import cc from 'camelcase';
import loaderUtils, {
isUrlRequest,
stringifyRequest,
urlToRequest,
} from 'loader-utils';
import normalizePath from 'normalize-path';
import cssesc from 'cssesc';
import modulesValues from 'postcss-modules-values';
import localByDefault from 'postcss-modules-local-by-default';
import extractImports from 'postcss-modules-extract-imports';
import modulesScope from 'postcss-modules-scope';
/* eslint-disable line-comment-position */
const placholderRegExps = {
importItemG: /___CSS_LOADER_IMPORT___([0-9]+)___/g,
importItem: /___CSS_LOADER_IMPORT___([0-9]+)___/,
};
function getImportPrefix(loaderContext, importLoaders) {
if (importLoaders === false) {
return '';
}
const numberImportedLoaders = parseInt(importLoaders, 10) || 0;
const loadersRequest = loaderContext.loaders
.slice(
loaderContext.loaderIndex,
loaderContext.loaderIndex + 1 + numberImportedLoaders
)
.map((x) => x.request)
.join('!');
return `-!${loadersRequest}!`;
}
function camelCase(str) {
return cc(str);
}
function dashesCamelCase(str) {
return str.replace(/-+(\w)/g, (match, firstLetter) =>
firstLetter.toUpperCase()
);
}
const whitespace = '[\\x20\\t\\r\\n\\f]';
const unescapeRegExp = new RegExp(
`\\\\([\\da-f]{1,6}${whitespace}?|(${whitespace})|.)`,
'ig'
);
function unescape(str) {
return str.replace(unescapeRegExp, (_, escaped, escapedWhitespace) => {
const high = `0x${escaped}` - 0x10000;
// NaN means non-codepoint
// Workaround erroneous numeric interpretation of +"0x"
// eslint-disable-next-line no-self-compare
return high !== high || escapedWhitespace
? escaped
: high < 0
? // BMP codepoint
String.fromCharCode(high + 0x10000)
: // Supplemental Plane codepoint (surrogate pair)
// eslint-disable-next-line no-bitwise
String.fromCharCode((high >> 10) | 0xd800, (high & 0x3ff) | 0xdc00);
});
}
function getLocalIdent(loaderContext, localIdentName, localName, options) {
if (!options.context) {
// eslint-disable-next-line no-param-reassign
options.context = loaderContext.rootContext;
}
const request = normalizePath(
path.relative(options.context || '', loaderContext.resourcePath)
);
// eslint-disable-next-line no-param-reassign
options.content = `${options.hashPrefix + request}+${unescape(localName)}`;
// Using `[path]` placeholder outputs `/` we need escape their
// Also directories can contains invalid characters for css we need escape their too
return cssesc(
loaderUtils
.interpolateName(loaderContext, localIdentName, options)
// For `[hash]` placeholder
.replace(/^((-?[0-9])|--)/, '_$1'),
{ isIdentifier: true }
).replace(/\\\[local\\\]/gi, localName);
}
function getFilter(filter, resourcePath, defaultFilter = null) {
return (item) => {
if (defaultFilter && !defaultFilter(item)) {
return false;
}
if (typeof filter === 'function') {
return filter(item, resourcePath);
}
return true;
};
}
function getImportItemReplacer(
messages,
loaderContext,
importUrlPrefix,
exportOnlyLocals
) {
return function replacer(placeholder) {
const match = placholderRegExps.importItem.exec(placeholder);
const idx = Number(match[1]);
const message = messages.find(
// eslint-disable-next-line no-shadow
(message) =>
message.type === 'icss-import' &&
message.item &&
message.item.index === idx
);
if (!message) {
return placeholder;
}
const { item } = message;
const importUrl = importUrlPrefix + urlToRequest(item.url);
if (exportOnlyLocals) {
return `" + require(${stringifyRequest(
loaderContext,
importUrl
)})[${JSON.stringify(item.export)}] + "`;
}
return `" + require(${stringifyRequest(
loaderContext,
importUrl
)}).locals[${JSON.stringify(item.export)}] + "`;
};
}
function getExports(messages, exportLocalsStyle, importItemReplacer) {
return messages
.filter((message) => message.type === 'export')
.reduce((accumulator, message) => {
const { key, value } = message.item;
let valueAsString = JSON.stringify(value);
valueAsString = valueAsString.replace(
placholderRegExps.importItemG,
importItemReplacer
);
function addEntry(k) {
accumulator.push(`\t${JSON.stringify(k)}: ${valueAsString}`);
}
let targetKey;
switch (exportLocalsStyle) {
case 'camelCase':
addEntry(key);
targetKey = camelCase(key);
if (targetKey !== key) {
addEntry(targetKey);
}
break;
case 'camelCaseOnly':
addEntry(camelCase(key));
break;
case 'dashes':
addEntry(key);
targetKey = dashesCamelCase(key);
if (targetKey !== key) {
addEntry(targetKey);
}
break;
case 'dashesOnly':
addEntry(dashesCamelCase(key));
break;
case 'asIs':
default:
addEntry(key);
break;
}
return accumulator;
}, []);
}
function getImports(messages, importUrlPrefix, loaderContext, callback) {
const imports = [];
// Helper for ensuring valid CSS strings from requires
let hasUrlEscapeHelper = false;
messages.forEach((message) => {
if (message.type === 'import') {
const { url } = message.item;
const media = message.item.media || '';
if (!isUrlRequest(url)) {
imports.push(
`exports.push([module.id, ${JSON.stringify(
`@import url(${url});`
)}, ${JSON.stringify(media)}]);`
);
} else {
const importUrl = importUrlPrefix + urlToRequest(url);
imports.push(
`exports.i(require(${stringifyRequest(
loaderContext,
importUrl
)}), ${JSON.stringify(media)});`
);
}
}
if (message.type === 'url') {
if (!hasUrlEscapeHelper) {
imports.push(
`var urlEscape = require(${stringifyRequest(
loaderContext,
require.resolve('./runtime/url-escape.js')
)});`
);
hasUrlEscapeHelper = true;
}
const { url, placeholder, needQuotes } = message.item;
// Remove `#hash` and `?#hash` from `require`
const [normalizedUrl, singleQuery, hashValue] = url.split(/(\?)?#/);
const hash =
singleQuery || hashValue
? `"${singleQuery ? '?' : ''}${hashValue ? `#${hashValue}` : ''}"`
: '';
imports.push(
`var ${placeholder} = urlEscape(require(${stringifyRequest(
loaderContext,
urlToRequest(normalizedUrl)
)})${hash ? ` + ${hash}` : ''}${needQuotes ? ', true' : ''});`
);
}
callback(message);
});
return imports;
}
function getModulesPlugins(options, loaderContext) {
let modulesOptions = {
mode: 'local',
localIdentName: '[hash:base64]',
getLocalIdent,
context: null,
hashPrefix: '',
localIdentRegExp: null,
};
if (
typeof options.modules === 'boolean' ||
typeof options.modules === 'string'
) {
modulesOptions.mode =
typeof options.modules === 'string' ? options.modules : 'local';
} else {
modulesOptions = Object.assign({}, modulesOptions, options.modules);
}
return [
modulesValues,
localByDefault({ mode: modulesOptions.mode }),
extractImports(),
modulesScope({
generateScopedName: function generateScopedName(exportName) {
return modulesOptions.getLocalIdent(
loaderContext,
modulesOptions.localIdentName,
exportName,
{
context: modulesOptions.context,
hashPrefix: modulesOptions.hashPrefix,
regExp: modulesOptions.localIdentRegExp,
}
);
},
}),
];
}
function normalizeSourceMap(map) {
let newMap = map;
// Some loader emit source map as string
// Strip any JSON XSSI avoidance prefix from the string (as documented in the source maps specification), and then parse the string as JSON.
if (typeof newMap === 'string') {
newMap = JSON.parse(newMap.replace(/^\)]}'[^\n]*\n/, ''));
}
// Source maps should use forward slash because it is URLs (https://github.com/mozilla/source-map/issues/91)
// We should normalize path because previous loaders like `sass-loader` using backslash when generate source map
if (newMap.file) {
newMap.file = normalizePath(newMap.file);
}
if (newMap.sourceRoot) {
newMap.sourceRoot = normalizePath(newMap.sourceRoot);
}
if (newMap.sources) {
newMap.sources = newMap.sources.map((source) => normalizePath(source));
}
return newMap;
}
export {
getImportPrefix,
getLocalIdent,
placholderRegExps,
getFilter,
getImportItemReplacer,
getExports,
getImports,
getModulesPlugins,
normalizeSourceMap,
};