97 lines
2.3 KiB
JavaScript
97 lines
2.3 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const forEachBail = require("./forEachBail");
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function loadDescriptionFile(resolver, directory, filenames, resolveContext, callback) {
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(function findDescriptionFile() {
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forEachBail(filenames, (filename, callback) => {
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const descriptionFilePath = resolver.join(directory, filename);
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if(resolver.fileSystem.readJson) {
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resolver.fileSystem.readJson(descriptionFilePath, (err, content) => {
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if(err) {
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if(typeof err.code !== "undefined") return callback();
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return onJson(err);
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}
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onJson(null, content);
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});
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} else {
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resolver.fileSystem.readFile(descriptionFilePath, (err, content) => {
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if(err) return callback();
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let json;
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try {
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json = JSON.parse(content);
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} catch(e) {
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onJson(e);
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}
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onJson(null, json);
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});
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}
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function onJson(err, content) {
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if(err) {
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if(resolveContext.log)
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resolveContext.log(descriptionFilePath + " (directory description file): " + err);
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else
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err.message = descriptionFilePath + " (directory description file): " + err;
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return callback(err);
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}
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callback(null, {
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content: content,
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directory: directory,
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path: descriptionFilePath
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});
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}
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}, (err, result) => {
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if(err) return callback(err);
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if(result) {
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return callback(null, result);
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} else {
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directory = cdUp(directory);
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if(!directory) {
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return callback();
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} else {
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return findDescriptionFile();
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}
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}
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});
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}());
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}
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function getField(content, field) {
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if(!content) return undefined;
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if(Array.isArray(field)) {
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let current = content;
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for(let j = 0; j < field.length; j++) {
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if(current === null || typeof current !== "object") {
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current = null;
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break;
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}
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current = current[field[j]];
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}
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if(typeof current === "object") {
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return current;
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}
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} else {
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if(typeof content[field] === "object") {
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return content[field];
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}
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}
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}
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function cdUp(directory) {
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if(directory === "/") return null;
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const i = directory.lastIndexOf("/"),
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j = directory.lastIndexOf("\\");
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const p = i < 0 ? j : j < 0 ? i : i < j ? j : i;
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if(p < 0) return null;
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return directory.substr(0, p || 1);
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}
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exports.loadDescriptionFile = loadDescriptionFile;
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exports.getField = getField;
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exports.cdUp = cdUp;
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