/
utils.js
145 lines (132 loc) · 3.82 KB
/
utils.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
const path = require('path');
const camelCase = require('lodash/camelCase');
const loaderUtils = require('loader-utils');
function dashesCamelCase(str) {
return str.replace(/-+(\w)/g, (match, firstLetter) =>
firstLetter.toUpperCase()
);
}
function compileExports(result, importItemMatcher, camelCaseKeys) {
if (!result.exports || !Object.keys(result.exports).length) {
return '';
}
const exportJs = Object.keys(result.exports)
.reduce((res, key) => {
let valueAsString = JSON.stringify(result.exports[key]);
valueAsString = valueAsString.replace(
result.importItemRegExpG,
importItemMatcher
);
function addEntry(k) {
res.push(`\t${JSON.stringify(k)}: ${valueAsString}`);
}
let targetKey;
switch (camelCaseKeys) {
case true:
addEntry(key);
targetKey = camelCase(key);
if (targetKey !== key) {
addEntry(targetKey);
}
break;
case 'dashes':
addEntry(key);
targetKey = dashesCamelCase(key);
if (targetKey !== key) {
addEntry(targetKey);
}
break;
case 'only':
addEntry(camelCase(key));
break;
case 'dashesOnly':
addEntry(dashesCamelCase(key));
break;
default:
addEntry(key);
break;
}
return res;
}, [])
.join(',\n');
return `{\n${exportJs}\n}`;
}
function getImportPrefix(loaderContext, query) {
if (query.importLoaders === false) {
return '';
}
const importLoaders = parseInt(query.importLoaders, 10) || 0;
const loadersRequest = loaderContext.loaders
.slice(
loaderContext.loaderIndex,
loaderContext.loaderIndex + 1 + importLoaders
)
.map((x) => x.request)
.join('!');
return `-!${loadersRequest}!`;
}
function getLocalIdent(loaderContext, localIdentName, localName, options) {
if (!options.context) {
if (loaderContext.rootContext) {
// eslint-disable-next-line no-param-reassign
options.context = loaderContext.rootContext;
} else if (
loaderContext.options &&
typeof loaderContext.options.context === 'string'
) {
// eslint-disable-next-line no-param-reassign
options.context = loaderContext.options.context;
} else {
// eslint-disable-next-line no-param-reassign
options.context = loaderContext.context;
}
}
const request = path.relative(options.context, loaderContext.resourcePath);
// eslint-disable-next-line no-param-reassign
options.content = `${options.hashPrefix +
request.replace(/\\/g, '/')}+${localName}`;
// eslint-disable-next-line no-param-reassign
localIdentName = localIdentName.replace(/\[local\]/gi, localName);
const hash = loaderUtils.interpolateName(
loaderContext,
localIdentName,
options
);
return hash
.replace(new RegExp('[^a-zA-Z0-9\\-_\u00A0-\uFFFF]', 'g'), '-')
.replace(/^((-?[0-9])|--)/, '_$1');
}
function placeholderImportItemReplacer(
loaderContext,
result,
importUrlPrefix,
onlyLocals = false
) {
return (item) => {
const match = result.importItemRegExp.exec(item);
const idx = +match[1];
const importItem = result.importItems[idx];
const importUrl = importUrlPrefix + importItem.url;
if (onlyLocals) {
return `" + require(${loaderUtils.stringifyRequest(
loaderContext,
importUrl
)})[${JSON.stringify(importItem.export)}] + "`;
}
return `" + require(${loaderUtils.stringifyRequest(
loaderContext,
importUrl
)}).locals[${JSON.stringify(importItem.export)}] + "`;
};
}
module.exports = {
dashesCamelCase,
compileExports,
getImportPrefix,
getLocalIdent,
placeholderImportItemReplacer,
};