Fixed prism-core and prism-file-highlight to prevent errors in IE8.

Used local variable _self instead of overwriting self.
Closes #468.

components/prism-core.js

@@ -1,4 +1,4 @@
-self = (typeof window !== 'undefined')
+var _self = (typeof window !== 'undefined')
 	? window   // if in browser
 	: (
 		(typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope)
@@ -17,7 +17,7 @@ var Prism = (function(){
 // Private helper vars
 var lang = /\blang(?:uage)?-(?!\*)(\w+)\b/i;
 
-var _ = self.Prism = {
+var _ = _self.Prism = {
 	util: {
 		encode: function (tokens) {
 			if (tokens instanceof Token) {
@@ -50,7 +50,8 @@ var _ = self.Prism = {
 					return clone;
 
 				case 'Array':
-					return o.map(function(v) { return _.util.clone(v); });
+					// Check for existence for IE8
+					return o.map && o.map(function(v) { return _.util.clone(v); });
 			}
 
 			return o;
@@ -192,7 +193,7 @@ var _ = self.Prism = {
 
 		_.hooks.run('before-highlight', env);
 
-		if (async && self.Worker) {
+		if (async && _self.Worker) {
 			var worker = new Worker(_.filename);
 
 			worker.onmessage = function(evt) {
@@ -386,22 +387,22 @@ Token.stringify = function(o, language, parent) {
 
 };
 
-if (!self.document) {
-	if (!self.addEventListener) {
+if (!_self.document) {
+	if (!_self.addEventListener) {
 		// in Node.js
-		return self.Prism;
+		return _self.Prism;
 	}
  	// In worker
-	self.addEventListener('message', function(evt) {
+	_self.addEventListener('message', function(evt) {
 		var message = JSON.parse(evt.data),
 		    lang = message.language,
 		    code = message.code;
 
-		self.postMessage(JSON.stringify(_.util.encode(_.tokenize(code, _.languages[lang]))));
-		self.close();
+		_self.postMessage(JSON.stringify(_.util.encode(_.tokenize(code, _.languages[lang]))));
+		_self.close();
 	}, false);
 
-	return self.Prism;
+	return _self.Prism;
 }
 
 // Get current script and highlight
@@ -417,7 +418,7 @@ if (script) {
 	}
 }
 
-return self.Prism;
+return _self.Prism;
 
 })();
 

plugins/file-highlight/prism-file-highlight.js

@@ -16,56 +16,58 @@
 			'psm1': 'powershell'
 		};
 
-		Array.prototype.slice.call(document.querySelectorAll('pre[data-src]')).forEach(function(pre) {
-			var src = pre.getAttribute('data-src');
-
-			var language, parent = pre;
-			var lang = /\blang(?:uage)?-(?!\*)(\w+)\b/i;
-			while (parent && !lang.test(parent.className)) {
-				parent = parent.parentNode;
-			}
+		if(Array.prototype.forEach) { // Check to prevent error in IE8
+			Array.prototype.slice.call(document.querySelectorAll('pre[data-src]')).forEach(function (pre) {
+				var src = pre.getAttribute('data-src');
+
+				var language, parent = pre;
+				var lang = /\blang(?:uage)?-(?!\*)(\w+)\b/i;
+				while (parent && !lang.test(parent.className)) {
+					parent = parent.parentNode;
+				}
 
-			if (parent) {
-				language = (pre.className.match(lang) || [,''])[1];
-			}
+				if (parent) {
+					language = (pre.className.match(lang) || [, ''])[1];
+				}
 
-			if (!language) {
-				var extension = (src.match(/\.(\w+)$/) || [, ''])[1];
-				language = Extensions[extension] || extension;
-			}
+				if (!language) {
+					var extension = (src.match(/\.(\w+)$/) || [, ''])[1];
+					language = Extensions[extension] || extension;
+				}
 
-			var code = document.createElement('code');
-			code.className = 'language-' + language;
+				var code = document.createElement('code');
+				code.className = 'language-' + language;
 
-			pre.textContent = '';
+				pre.textContent = '';
 
-			code.textContent = 'Loading…';
+				code.textContent = 'Loading…';
 
-			pre.appendChild(code);
+				pre.appendChild(code);
 
-			var xhr = new XMLHttpRequest();
+				var xhr = new XMLHttpRequest();
 
-			xhr.open('GET', src, true);
+				xhr.open('GET', src, true);
 
-			xhr.onreadystatechange = function() {
-				if (xhr.readyState == 4) {
+				xhr.onreadystatechange = function () {
+					if (xhr.readyState == 4) {
 
-					if (xhr.status < 400 && xhr.responseText) {
-						code.textContent = xhr.responseText;
+						if (xhr.status < 400 && xhr.responseText) {
+							code.textContent = xhr.responseText;
 
-						Prism.highlightElement(code);
+							Prism.highlightElement(code);
+						}
+						else if (xhr.status >= 400) {
+							code.textContent = '✖ Error ' + xhr.status + ' while fetching file: ' + xhr.statusText;
+						}
+						else {
+							code.textContent = '✖ Error: File does not exist or is empty';
+						}
 					}
-					else if (xhr.status >= 400) {
-						code.textContent = '✖ Error ' + xhr.status + ' while fetching file: ' + xhr.statusText;
-					}
-					else {
-						code.textContent = '✖ Error: File does not exist or is empty';
-					}
-				}
-			};
+				};
 
-			xhr.send(null);
-		});
+				xhr.send(null);
+			});
+		}
 
 	};