From e7bf5952d0729b37e677168b6e8fbd1ce58ed1a2 Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Sun, 10 Aug 2014 17:28:37 +0200
Subject: First version

---
 point/libs/normalize/normalize.js | 140 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 point/libs/normalize/normalize.js

(limited to 'point/libs/normalize/normalize.js')

diff --git a/point/libs/normalize/normalize.js b/point/libs/normalize/normalize.js
new file mode 100644
index 0000000..e1733d6
--- /dev/null
+++ b/point/libs/normalize/normalize.js
@@ -0,0 +1,140 @@
+/*
+ * css.normalize.js
+ *
+ * CSS Normalization
+ *
+ * CSS paths are normalized based on an optional basePath and the RequireJS config
+ *
+ * Usage:
+ *   normalize(css, fromBasePath, toBasePath);
+ *
+ * css: the stylesheet content to normalize
+ * fromBasePath: the absolute base path of the css relative to any root (but without ../ backtracking)
+ * toBasePath: the absolute new base path of the css relative to the same root
+ * 
+ * Absolute dependencies are left untouched.
+ *
+ * Urls in the CSS are picked up by regular expressions.
+ * These will catch all statements of the form:
+ *
+ * url(*)
+ * url('*')
+ * url("*")
+ * 
+ * @import '*'
+ * @import "*"
+ *
+ * (and so also @import url(*) variations)
+ *
+ * For urls needing normalization
+ *
+ */
+
+define(function () {
+
+	// regular expression for removing double slashes
+	// eg http://www.example.com//my///url/here -> http://www.example.com/my/url/here
+	var slashes = /([^:])\/+/g
+	var removeDoubleSlashes = function (uri) {
+		return uri.replace(slashes, '$1/');
+	}
+
+	// given a relative URI, and two absolute base URIs, convert it from one base to another
+	var protocolRegEx = /[^\:\/]*:\/\/([^\/])*/;
+	var absUrlRegEx = /^(\/|data:)/;
+
+	function convertURIBase(uri, fromBase, toBase) {
+		if (uri.match(absUrlRegEx) || uri.match(protocolRegEx))
+			return uri;
+		uri = removeDoubleSlashes(uri);
+		// if toBase specifies a protocol path, ensure this is the same protocol as fromBase, if not
+		// use absolute path at fromBase
+		var toBaseProtocol = toBase.match(protocolRegEx);
+		var fromBaseProtocol = fromBase.match(protocolRegEx);
+		if (fromBaseProtocol && (!toBaseProtocol || toBaseProtocol[1] != fromBaseProtocol[1] || toBaseProtocol[2] != fromBaseProtocol[2]))
+			return absoluteURI(uri, fromBase);
+
+		else {
+			return relativeURI(absoluteURI(uri, fromBase), toBase);
+		}
+	};
+
+	// given a relative URI, calculate the absolute URI
+	function absoluteURI(uri, base) {
+		if (uri.substr(0, 2) == './')
+			uri = uri.substr(2);
+
+		// absolute urls are left in tact
+		if (uri.match(absUrlRegEx) || uri.match(protocolRegEx))
+			return uri;
+
+		var baseParts = base.split('/');
+		var uriParts = uri.split('/');
+
+		baseParts.pop();
+
+		while (curPart = uriParts.shift())
+			if (curPart == '..')
+				baseParts.pop();
+			else
+				baseParts.push(curPart);
+
+		return baseParts.join('/');
+	};
+
+
+	// given an absolute URI, calculate the relative URI
+	function relativeURI(uri, base) {
+
+		// reduce base and uri strings to just their difference string
+		var baseParts = base.split('/');
+		baseParts.pop();
+		base = baseParts.join('/') + '/';
+		i = 0;
+		while (base.substr(i, 1) == uri.substr(i, 1))
+			i++;
+		while (base.substr(i, 1) != '/')
+			i--;
+		base = base.substr(i + 1);
+		uri = uri.substr(i + 1);
+
+		// each base folder difference is thus a backtrack
+		baseParts = base.split('/');
+		var uriParts = uri.split('/');
+		out = '';
+		while (baseParts.shift())
+			out += '../';
+
+		// finally add uri parts
+		while (curPart = uriParts.shift())
+			out += curPart + '/';
+
+		return out.substr(0, out.length - 1);
+	};
+
+	var normalizeCSS = function (source, fromBase, toBase) {
+
+		fromBase = removeDoubleSlashes(fromBase);
+		toBase = removeDoubleSlashes(toBase);
+
+		var urlRegEx = /@import\s*("([^"]*)"|'([^']*)')|url\s*\(\s*(\s*"([^"]*)"|'([^']*)'|[^\)]*\s*)\s*\)/ig;
+		var result, url, source;
+
+		while (result = urlRegEx.exec(source)) {
+			url = result[3] || result[2] || result[5] || result[6] || result[4];
+			var newUrl;
+			newUrl = convertURIBase(url, fromBase, toBase);
+			var quoteLen = result[5] || result[6] ? 1 : 0;
+			source = source.substr(0, urlRegEx.lastIndex - url.length - quoteLen - 1) + newUrl + source.substr(urlRegEx.lastIndex - quoteLen - 1);
+			urlRegEx.lastIndex = urlRegEx.lastIndex + (newUrl.length - url.length);
+		}
+
+		return source;
+	};
+
+	normalizeCSS.convertURIBase = convertURIBase;
+	normalizeCSS.absoluteURI = absoluteURI;
+	normalizeCSS.relativeURI = relativeURI;
+
+	return normalizeCSS;
+});
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