lepu-test-platform-web/node_modules/cosmiconfig/dist/createExplorer.js

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//
'use strict';
const path = require('path');
const loaders = require('./loaders');
const readFile = require('./readFile');
const cacheWrapper = require('./cacheWrapper');
const getDirectory = require('./getDirectory');
const getPropertyByPath = require('./getPropertyByPath');
const MODE_SYNC = 'sync';
// An object value represents a config object.
// null represents that the loader did not find anything relevant.
// undefined represents that the loader found something relevant
// but it was empty.
class Explorer {
constructor(options ) {
this.loadCache = options.cache ? new Map() : null;
this.loadSyncCache = options.cache ? new Map() : null;
this.searchCache = options.cache ? new Map() : null;
this.searchSyncCache = options.cache ? new Map() : null;
this.config = options;
this.validateConfig();
}
clearLoadCache() {
if (this.loadCache) {
this.loadCache.clear();
}
if (this.loadSyncCache) {
this.loadSyncCache.clear();
}
}
clearSearchCache() {
if (this.searchCache) {
this.searchCache.clear();
}
if (this.searchSyncCache) {
this.searchSyncCache.clear();
}
}
clearCaches() {
this.clearLoadCache();
this.clearSearchCache();
}
validateConfig() {
const config = this.config;
config.searchPlaces.forEach(place => {
const loaderKey = path.extname(place) || 'noExt';
const loader = config.loaders[loaderKey];
if (!loader) {
throw new Error(
`No loader specified for ${getExtensionDescription(
place
)}, so searchPlaces item "${place}" is invalid`
);
}
});
}
search(searchFrom ) {
searchFrom = searchFrom || process.cwd();
return getDirectory(searchFrom).then(dir => {
return this.searchFromDirectory(dir);
});
}
searchFromDirectory(dir ) {
const absoluteDir = path.resolve(process.cwd(), dir);
const run = () => {
return this.searchDirectory(absoluteDir).then(result => {
const nextDir = this.nextDirectoryToSearch(absoluteDir, result);
if (nextDir) {
return this.searchFromDirectory(nextDir);
}
return this.config.transform(result);
});
};
if (this.searchCache) {
return cacheWrapper(this.searchCache, absoluteDir, run);
}
return run();
}
searchSync(searchFrom ) {
searchFrom = searchFrom || process.cwd();
const dir = getDirectory.sync(searchFrom);
return this.searchFromDirectorySync(dir);
}
searchFromDirectorySync(dir ) {
const absoluteDir = path.resolve(process.cwd(), dir);
const run = () => {
const result = this.searchDirectorySync(absoluteDir);
const nextDir = this.nextDirectoryToSearch(absoluteDir, result);
if (nextDir) {
return this.searchFromDirectorySync(nextDir);
}
return this.config.transform(result);
};
if (this.searchSyncCache) {
return cacheWrapper(this.searchSyncCache, absoluteDir, run);
}
return run();
}
searchDirectory(dir ) {
return this.config.searchPlaces.reduce((prevResultPromise, place) => {
return prevResultPromise.then(prevResult => {
if (this.shouldSearchStopWithResult(prevResult)) {
return prevResult;
}
return this.loadSearchPlace(dir, place);
});
}, Promise.resolve(null));
}
searchDirectorySync(dir ) {
let result = null;
for (const place of this.config.searchPlaces) {
result = this.loadSearchPlaceSync(dir, place);
if (this.shouldSearchStopWithResult(result)) break;
}
return result;
}
shouldSearchStopWithResult(result ) {
if (result === null) return false;
if (result.isEmpty && this.config.ignoreEmptySearchPlaces) return false;
return true;
}
loadSearchPlace(dir , place ) {
const filepath = path.join(dir, place);
return readFile(filepath).then(content => {
return this.createCosmiconfigResult(filepath, content);
});
}
loadSearchPlaceSync(dir , place ) {
const filepath = path.join(dir, place);
const content = readFile.sync(filepath);
return this.createCosmiconfigResultSync(filepath, content);
}
nextDirectoryToSearch(
currentDir ,
currentResult
) {
if (this.shouldSearchStopWithResult(currentResult)) {
return null;
}
const nextDir = nextDirUp(currentDir);
if (nextDir === currentDir || currentDir === this.config.stopDir) {
return null;
}
return nextDir;
}
loadPackageProp(filepath , content ) {
const parsedContent = loaders.loadJson(filepath, content);
const packagePropValue = getPropertyByPath(
parsedContent,
this.config.packageProp
);
return packagePropValue || null;
}
getLoaderEntryForFile(filepath ) {
if (path.basename(filepath) === 'package.json') {
const loader = this.loadPackageProp.bind(this);
return { sync: loader, async: loader };
}
const loaderKey = path.extname(filepath) || 'noExt';
return this.config.loaders[loaderKey] || {};
}
getSyncLoaderForFile(filepath ) {
const entry = this.getLoaderEntryForFile(filepath);
if (!entry.sync) {
throw new Error(
`No sync loader specified for ${getExtensionDescription(filepath)}`
);
}
return entry.sync;
}
getAsyncLoaderForFile(filepath ) {
const entry = this.getLoaderEntryForFile(filepath);
const loader = entry.async || entry.sync;
if (!loader) {
throw new Error(
`No async loader specified for ${getExtensionDescription(filepath)}`
);
}
return loader;
}
loadFileContent(
mode ,
filepath ,
content
) {
if (content === null) {
return null;
}
if (content.trim() === '') {
return undefined;
}
const loader =
mode === MODE_SYNC
? this.getSyncLoaderForFile(filepath)
: this.getAsyncLoaderForFile(filepath);
return loader(filepath, content);
}
loadedContentToCosmiconfigResult(
filepath ,
loadedContent
) {
if (loadedContent === null) {
return null;
}
if (loadedContent === undefined) {
return { filepath, config: undefined, isEmpty: true };
}
return { config: loadedContent, filepath };
}
createCosmiconfigResult(
filepath ,
content
) {
return Promise.resolve()
.then(() => {
return this.loadFileContent('async', filepath, content);
})
.then(loaderResult => {
return this.loadedContentToCosmiconfigResult(filepath, loaderResult);
});
}
createCosmiconfigResultSync(
filepath ,
content
) {
const loaderResult = this.loadFileContent('sync', filepath, content);
return this.loadedContentToCosmiconfigResult(filepath, loaderResult);
}
validateFilePath(filepath ) {
if (!filepath) {
throw new Error('load and loadSync must pass a non-empty string');
}
}
load(filepath ) {
return Promise.resolve().then(() => {
this.validateFilePath(filepath);
const absoluteFilePath = path.resolve(process.cwd(), filepath);
return cacheWrapper(this.loadCache, absoluteFilePath, () => {
return readFile(absoluteFilePath, { throwNotFound: true })
.then(content => {
return this.createCosmiconfigResult(absoluteFilePath, content);
})
.then(this.config.transform);
});
});
}
loadSync(filepath ) {
this.validateFilePath(filepath);
const absoluteFilePath = path.resolve(process.cwd(), filepath);
return cacheWrapper(this.loadSyncCache, absoluteFilePath, () => {
const content = readFile.sync(absoluteFilePath, { throwNotFound: true });
const result = this.createCosmiconfigResultSync(
absoluteFilePath,
content
);
return this.config.transform(result);
});
}
}
module.exports = function createExplorer(options ) {
const explorer = new Explorer(options);
return {
search: explorer.search.bind(explorer),
searchSync: explorer.searchSync.bind(explorer),
load: explorer.load.bind(explorer),
loadSync: explorer.loadSync.bind(explorer),
clearLoadCache: explorer.clearLoadCache.bind(explorer),
clearSearchCache: explorer.clearSearchCache.bind(explorer),
clearCaches: explorer.clearCaches.bind(explorer),
};
};
function nextDirUp(dir ) {
return path.dirname(dir);
}
function getExtensionDescription(filepath ) {
const ext = path.extname(filepath);
return ext ? `extension "${ext}"` : 'files without extensions';
}