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 * @fileOverview
 * @license
 *
 * Grauw URI utilities
 *
 * See: http://hg.grauw.nl/grauw-lib/file/tip/src/uri.js
 *
 * @author Laurens Holst (http://www.grauw.nl/)
 *
 *   Copyright 2012 Laurens Holst
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */
/*global define*/

define(function() {

	/**
	 * Constructs a URI object.
	 * @constructor
	 * @class Implementation of URI parsing and base URI resolving algorithm in RFC 3986.
	 * @param {string|URI} uri A string or URI object to create the object from.
	 */
	function URI(uri) {
		if (uri instanceof URI) {  // copy constructor
			this.scheme = uri.scheme;
			this.authority = uri.authority;
			this.path = uri.path;
			this.query = uri.query;
			this.fragment = uri.fragment;
		} else if (uri) {  // uri is URI string or cast to string
			var c = parseRegex.exec(uri);
			this.scheme = c[1];
			this.authority = c[2];
			this.path = c[3];
			this.query = c[4];
			this.fragment = c[5];
		}
	};

	// Initial values on the prototype
	URI.prototype.scheme    = null;
	URI.prototype.authority = null;
	URI.prototype.path      = '';
	URI.prototype.query     = null;
	URI.prototype.fragment  = null;

	// Regular expression from RFC 3986 appendix B
	var parseRegex = new RegExp('^(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\\?([^#]*))?(?:#(.*))?$');

	/**
	 * Returns the scheme part of the URI.
	 * In "http://example.com:80/a/b?x#y" this is "http".
	 */
	URI.prototype.getScheme = function() {
		return this.scheme;
	};

	/**
	 * Returns the authority part of the URI.
	 * In "http://example.com:80/a/b?x#y" this is "example.com:80".
	 */
	URI.prototype.getAuthority = function() {
		return this.authority;
	};

	/**
	 * Returns the path part of the URI.
	 * In "http://example.com:80/a/b?x#y" this is "/a/b".
	 * In "mailto:mike@example.com" this is "mike@example.com".
	 */
	URI.prototype.getPath = function() {
		return this.path;
	};

	/**
	 * Returns the query part of the URI.
	 * In "http://example.com:80/a/b?x#y" this is "x".
	 */
	URI.prototype.getQuery = function() {
		return this.query;
	};

	/**
	 * Returns the fragment part of the URI.
	 * In "http://example.com:80/a/b?x#y" this is "y".
	 */
	URI.prototype.getFragment = function() {
		return this.fragment;
	};

	/**
	 * Tests whether the URI is an absolute URI.
	 * See RFC 3986 section 4.3.
	 */
	URI.prototype.isAbsolute = function() {
		return !!this.scheme && !this.fragment;
	};

	///**
	//* Extensive validation of the URI against the ABNF in RFC 3986
	//*/
	//URI.prototype.validate

	/**
	 * Tests whether the URI is a same-document reference.
	 * See RFC 3986 section 4.4.
	 *
	 * To perform more thorough comparison, you can normalise the URI objects.
	 */
	URI.prototype.isSameDocumentAs = function(uri) {
		return uri.scheme == this.scheme &&
		    uri.authority == this.authority &&
		         uri.path == this.path &&
		        uri.query == this.query;
	};

	/**
	 * Simple String Comparison of two URIs.
	 * See RFC 3986 section 6.2.1.
	 *
	 * To perform more thorough comparison, you can normalise the URI objects.
	 */
	URI.prototype.equals = function(uri) {
		return this.isSameDocumentAs(uri) && uri.fragment == this.fragment;
	};

	/**
	 * Normalizes the URI using syntax-based normalization.
	 * This includes case normalization, percent-encoding normalization and path segment normalization.
	 * XXX: Percent-encoding normalization does not escape characters that need to be escaped.
	 *      (Although that would not be a valid URI in the first place. See validate().)
	 * See RFC 3986 section 6.2.2.
	 */
	URI.prototype.normalize = function() {
		this.removeDotSegments();
		if (this.scheme)
			this.scheme = this.scheme.toLowerCase();
		if (this.authority)
			this.authority = this.authority.replace(authorityRegex, replaceAuthority).
									replace(caseRegex, replaceCase);
		if (this.path)
			this.path = this.path.replace(caseRegex, replaceCase);
		if (this.query)
			this.query = this.query.replace(caseRegex, replaceCase);
		if (this.fragment)
			this.fragment = this.fragment.replace(caseRegex, replaceCase);
	};

	var caseRegex = /%[0-9a-z]{2}/gi;
	var percentRegex = /[a-zA-Z0-9\-\._~]/;
	var authorityRegex = /(.*@)?([^@:]*)(:.*)?/;

	function replaceCase(str) {
		var dec = unescape(str);
		return percentRegex.test(dec) ? dec : str.toUpperCase();
	}

	function replaceAuthority(str, p1, p2, p3) {
		return (p1 || '') + p2.toLowerCase() + (p3 || '');
	}

	/**
	 * Resolve a relative URI (this) against a base URI.
	 * The base URI must be an absolute URI.
	 * See RFC 3986 section 5.2
	 */
	URI.prototype.resolve = function(baseURI) {
		var uri = new URI();
		if (this.scheme) {
			uri.scheme = this.scheme;
			uri.authority = this.authority;
			uri.path = this.path;
			uri.query = this.query;
		} else {
			uri.scheme = baseURI.scheme;
			if (this.authority) {
				uri.authority = this.authority;
				uri.path = this.path;
				uri.query = this.query;
			} else {
				uri.authority = baseURI.authority;
				if (this.path == '') {
					uri.path = baseURI.path;
					uri.query = this.query || baseURI.query;
				} else {
					if (this.path.charAt(0) == '/') {
						uri.path = this.path;
						uri.removeDotSegments();
					} else {
						if (baseURI.authority && baseURI.path == '') {
							uri.path = '/' + this.path;
						} else {
							uri.path = baseURI.path.substring(0, baseURI.path.lastIndexOf('/') + 1) + this.path;
						}
						uri.removeDotSegments();
					}
					uri.query = this.query;
				}
			}
		}
		uri.fragment = this.fragment;
		return uri;
	};

	/**
	 * Remove dot segments from path.
	 * See RFC 3986 section 5.2.4
	 * @private
	 */
	URI.prototype.removeDotSegments = function() {
		var input = this.path.split('/'),
			output = [],
			segment,
			absPath = input[0] == '';
		if (absPath)
			input.shift();
		var sFirst = input[0] == '' ? input.shift() : null;
		while (input.length) {
			segment = input.shift();
			if (segment == '..') {
				output.pop();
			} else if (segment != '.') {
				output.push(segment);
			}
		}
		if (segment == '.' || segment == '..')
			output.push('');
		if (absPath)
			output.unshift('');
		this.path = output.join('/');
	};

	/**
	 * Resolves a relative URI against an absolute base URI.
	 * Convenience method.
	 * @param {String} uri the relative URI to resolve
	 * @param {String} baseURI the base URI (must be absolute) to resolve against
	 */
	URI.resolve = function(sURI, sBaseURI) {
		var uri = cache[sURI] || (cache[sURI] = new URI(sURI));
		var baseURI = cache[sBaseURI] || (cache[sBaseURI] = new URI(sBaseURI));
		return uri.resolve(baseURI).toString();
	};

	var cache = {};

	/**
	 * Serialises the URI to a string.
	 */
	URI.prototype.toString = function() {
		var result = '';
		if (this.scheme)
			result += this.scheme + ':';
		if (this.authority)
			result += '//' + this.authority;
		result += this.path;
		if (this.query)
			result += '?' + this.query;
		if (this.fragment)
			result += '#' + this.fragment;
		return result;
	};

return URI;
});
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