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 wxy
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var path = require('path'),
fs = require('./fs'),
PromiseConstructor = typeof Promise === 'undefined' ? require('promise') : Promise,
AbstractFileManager = require('../less/environment/abstract-file-manager.js');
var FileManager = function() {
this.contents = {};
};
FileManager.prototype = new AbstractFileManager();
FileManager.prototype.supports = function(filename, currentDirectory, options, environment) {
return true;
};
FileManager.prototype.supportsSync = function(filename, currentDirectory, options, environment) {
return true;
};
FileManager.prototype.loadFile = function(filename, currentDirectory, options, environment, callback) {
var fullFilename,
isAbsoluteFilename = this.isPathAbsolute(filename),
filenamesTried = [],
self = this,
prefix = filename.slice(0, 1),
explicit = prefix === '.' || prefix === '/',
result = null,
isNodeModule = false,
npmPrefix = 'npm://';
options = options || {};
var paths = isAbsoluteFilename ? [''] : [currentDirectory];
if (options.paths) { paths.push.apply(paths, options.paths); }
if (!isAbsoluteFilename && paths.indexOf('.') === -1) { paths.push('.'); }
var prefixes = options.prefixes || [''];
var fileParts = this.extractUrlParts(filename);
if (options.syncImport) {
getFileData(returnData, returnData);
if (callback) {
callback(result.error, result);
}
else {
return result;
}
}
else {
// promise is guaranteed to be asyncronous
// which helps as it allows the file handle
// to be closed before it continues with the next file
return new PromiseConstructor(getFileData);
}
function returnData(data) {
if (!data.filename) {
result = { error: data };
}
else {
result = data;
}
}
function getFileData(fulfill, reject) {
(function tryPathIndex(i) {
if (i < paths.length) {
(function tryPrefix(j) {
if (j < prefixes.length) {
isNodeModule = false;
fullFilename = fileParts.rawPath + prefixes[j] + fileParts.filename;
if (paths[i]) {
fullFilename = path.join(paths[i], fullFilename);
}
if (!explicit && paths[i] === '.') {
try {
fullFilename = require.resolve(fullFilename);
isNodeModule = true;
}
catch (e) {
filenamesTried.push(npmPrefix + fullFilename);
tryWithExtension();
}
}
else {
tryWithExtension();
}
function tryWithExtension() {
var extFilename = options.ext ? self.tryAppendExtension(fullFilename, options.ext) : fullFilename;
if (extFilename !== fullFilename && !explicit && paths[i] === '.') {
try {
fullFilename = require.resolve(extFilename);
isNodeModule = true;
}
catch (e) {
filenamesTried.push(npmPrefix + extFilename);
fullFilename = extFilename;
}
}
else {
fullFilename = extFilename;
}
}
var modified = false;
if (self.contents[fullFilename]) {
try {
var stat = fs.statSync.apply(this, [fullFilename]);
if (stat.mtime.getTime() === self.contents[fullFilename].mtime.getTime()) {
fulfill({ contents: self.contents[fullFilename].data, filename: fullFilename});
}
else {
modified = true;
}
}
catch (e) {
modified = true;
}
}
if (modified || !self.contents[fullFilename]) {
var readFileArgs = [fullFilename];
if (!options.rawBuffer) {
readFileArgs.push('utf-8');
}
if (options.syncImport) {
try {
var data = fs.readFileSync.apply(this, readFileArgs);
var stat = fs.statSync.apply(this, [fullFilename]);
self.contents[fullFilename] = { data: data, mtime: stat.mtime };
fulfill({ contents: data, filename: fullFilename});
}
catch (e) {
filenamesTried.push(isNodeModule ? npmPrefix + fullFilename : fullFilename);
return tryPrefix(j + 1);
}
}
else {
readFileArgs.push(function(e, data) {
if (e) {
filenamesTried.push(isNodeModule ? npmPrefix + fullFilename : fullFilename);
return tryPrefix(j + 1);
}
var stat = fs.statSync.apply(this, [fullFilename]);
self.contents[fullFilename] = { data: data, mtime: stat.mtime };
fulfill({ contents: data, filename: fullFilename});
});
fs.readFile.apply(this, readFileArgs);
}
}
}
else {
tryPathIndex(i + 1);
}
})(0);
} else {
reject({ type: 'File', message: '\'' + filename + '\' wasn\'t found. Tried - ' + filenamesTried.join(',') });
}
}(0));
}
};
FileManager.prototype.loadFileSync = function(filename, currentDirectory, options, environment) {
options.syncImport = true;
return this.loadFile(filename, currentDirectory, options, environment);
};
module.exports = FileManager;
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