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'use strict';
var path = require('path'),
fs = require('fs');
var loaderUtils = require('loader-utils');
var getContextDirectory = require('./utility/get-context-directory');
/**
* Codec for relative paths with respect to the context directory.
* @type {{name:string, decode: function}}
*/
module.exports = {
name : 'npmModule',
decode: decode
};
/**
* Decode the given uri.
* Include only module paths containing `~`.
* @this {{options: object}} A loader or compilation
* @param {string} uri A source uri to decode
* @returns {boolean|string} False where unmatched else the decoded path
*/
function decode(uri) {
/* jshint validthis:true */
if (/~/.test(uri)) {
var relative = loaderUtils.urlToRequest(uri),
base = getContextDirectory.call(this),
absFile = path.normalize(path.join(base, 'node_modules', relative)),
isValid = !!absFile && fs.existsSync(absFile) && fs.statSync(absFile).isFile();
return isValid && absFile;
}
}