JS: Keyword fix (#1808)

This fixes false positives with properties which have the same name as keywords.

components/prism-javascript.js

@@ -11,7 +11,10 @@ Prism.languages.javascript = Prism.languages.extend('clike', {
 			pattern: /((?:^|})\s*)(?:catch|finally)\b/,
 			lookbehind: true
 		},
-		/\b(?:as|async(?=\s*(?:function\b|\(|[$\w\xA0-\uFFFF]|$))|await|break|case|class|const|continue|debugger|default|delete|do|else|enum|export|extends|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)\b/
+		{
+			pattern: /(^|[^.])\b(?:as|async(?=\s*(?:function\b|\(|[$\w\xA0-\uFFFF]|$))|await|break|case|class|const|continue|debugger|default|delete|do|else|enum|export|extends|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)\b/,
+			lookbehind: true
+		},
 	],
 	'number': /\b(?:(?:0[xX][\dA-Fa-f]+|0[bB][01]+|0[oO][0-7]+)n?|\d+n|NaN|Infinity)\b|(?:\b\d+\.?\d*|\B\.\d+)(?:[Ee][+-]?\d+)?/,
 	// Allow for all non-ASCII characters (See http://stackoverflow.com/a/2008444)

prism.js

@@ -774,7 +774,10 @@ Prism.languages.javascript = Prism.languages.extend('clike', {
 			pattern: /((?:^|})\s*)(?:catch|finally)\b/,
 			lookbehind: true
 		},
-		/\b(?:as|async(?=\s*(?:function\b|\(|[$\w\xA0-\uFFFF]|$))|await|break|case|class|const|continue|debugger|default|delete|do|else|enum|export|extends|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)\b/
+		{
+			pattern: /(^|[^.])\b(?:as|async(?=\s*(?:function\b|\(|[$\w\xA0-\uFFFF]|$))|await|break|case|class|const|continue|debugger|default|delete|do|else|enum|export|extends|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)\b/,
+			lookbehind: true
+		},
 	],
 	'number': /\b(?:(?:0[xX][\dA-Fa-f]+|0[bB][01]+|0[oO][0-7]+)n?|\d+n|NaN|Infinity)\b|(?:\b\d+\.?\d*|\B\.\d+)(?:[Ee][+-]?\d+)?/,
 	// Allow for all non-ASCII characters (See http://stackoverflow.com/a/2008444)

tests/languages/javascript/issue1807.test

@@ -0,0 +1,23 @@
+Array.from();
+foo.var.new;
+
+----------------------------------------------------
+
+[
+	"Array",
+	["punctuation", "."],
+	["function", "from"],
+	["punctuation", "("],
+	["punctuation", ")"],
+	["punctuation", ";"],
+	"\nfoo",
+	["punctuation", "."],
+	"var",
+	["punctuation", "."],
+	"new",
+	["punctuation", ";"]
+]
+
+----------------------------------------------------
+
+Checks for properties which have the same name as keywords. See #1807.