aaac7fed
 liuqimichale
add
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var forEachBail = require("./forEachBail");
function loadDescriptionFile(resolver, directory, filenames, callback) {
(function findDescriptionFile() {
forEachBail(filenames, function(filename, callback) {
var descriptionFilePath = resolver.join(directory, filename);
if(resolver.fileSystem.readJson) {
resolver.fileSystem.readJson(descriptionFilePath, function(err, content) {
if(err) {
if(typeof err.code !== "undefined") return callback();
return onJson(err);
}
onJson(null, content);
});
} else {
resolver.fileSystem.readFile(descriptionFilePath, function(err, content) {
if(err) return callback();
try {
var json = JSON.parse(content);
} catch(e) {
onJson(e);
}
onJson(null, json);
});
}
function onJson(err, content) {
if(err) {
if(callback.log)
callback.log(descriptionFilePath + " (directory description file): " + err);
else
err.message = descriptionFilePath + " (directory description file): " + err;
return callback(err);
}
callback(null, {
content: content,
directory: directory,
path: descriptionFilePath
});
}
}, function(err, result) {
if(err) return callback(err);
if(result) {
return callback(null, result);
} else {
directory = cdUp(directory);
if(!directory) {
return callback();
} else {
return findDescriptionFile();
}
}
});
}());
}
function getField(content, field) {
if(!content) return undefined;
if(Array.isArray(field)) {
var current = content;
for(var j = 0; j < field.length; j++) {
if(current === null || typeof current !== "object") {
current = null;
break;
}
current = current[field[j]];
}
if(typeof current === "object") {
return current;
}
} else {
if(typeof content[field] === "object") {
return content[field];
}
}
}
function cdUp(directory) {
if(directory === "/") return null;
var i = directory.lastIndexOf("/"),
j = directory.lastIndexOf("\\");
var p = i < 0 ? j : j < 0 ? i : i < j ? j : i;
if(p < 0) return null;
return directory.substr(0, p || 1);
}
exports.loadDescriptionFile = loadDescriptionFile;
exports.getField = getField;
exports.cdUp = cdUp;
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