update elements and fix some bugs

lib/src/prism/components/prism-tcl.js

Index: lib/src/prism/components/prism-tcl.js
diff --git a/lib/src/prism/components/prism-tcl.js b/lib/src/prism/components/prism-tcl.js
new file mode 100644
index 0000000000000000000000000000000000000000..b9e2206d6c64e4c8f933de11f551dff802309583
--- /dev/null
+++ b/lib/src/prism/components/prism-tcl.js
@@ -0,0 +1,43 @@
+Prism.languages.tcl = {
+	'comment': {
+		pattern: /(^|[^\\])#.*/,
+		lookbehind: true
+	},
+	'string': /"(?:[^"\\\r\n]|\\(?:\r\n|[\s\S]))*"/,
+	'variable': [
+		{
+			pattern: /(\$)(?:::)?(?:[a-zA-Z0-9]+::)*[a-zA-Z0-9_]+/,
+			lookbehind: true
+		},
+		{
+			pattern: /(\$){[^}]+}/,
+			lookbehind: true
+		},
+		{
+			pattern: /(^\s*set[ \t]+)(?:::)?(?:[a-zA-Z0-9]+::)*[a-zA-Z0-9_]+/m,
+			lookbehind: true
+		}
+	],
+	'function': {
+		pattern: /(^\s*proc[ \t]+)[^\s]+/m,
+		lookbehind: true
+	},
+	'builtin': [
+		{
+			pattern: /(^\s*)(?:proc|return|class|error|eval|exit|for|foreach|if|switch|while|break|continue)\b/m,
+			lookbehind: true
+		},
+		/\b(elseif|else)\b/
+	],
+	'scope': {
+		pattern: /(^\s*)(global|upvar|variable)\b/m,
+		lookbehind: true,
+		alias: 'constant'
+	},
+	'keyword': {
+		pattern: /(^\s*|\[)(after|append|apply|array|auto_(?:execok|import|load|mkindex|qualify|reset)|automkindex_old|bgerror|binary|catch|cd|chan|clock|close|concat|dde|dict|encoding|eof|exec|expr|fblocked|fconfigure|fcopy|file(?:event|name)?|flush|gets|glob|history|http|incr|info|interp|join|lappend|lassign|lindex|linsert|list|llength|load|lrange|lrepeat|lreplace|lreverse|lsearch|lset|lsort|math(?:func|op)|memory|msgcat|namespace|open|package|parray|pid|pkg_mkIndex|platform|puts|pwd|re_syntax|read|refchan|regexp|registry|regsub|rename|Safe_Base|scan|seek|set|socket|source|split|string|subst|Tcl|tcl(?:_endOfWord|_findLibrary|startOf(?:Next|Previous)Word|wordBreak(?:After|Before)|test|vars)|tell|time|tm|trace|unknown|unload|unset|update|uplevel|vwait)\b/m,
+		lookbehind: true
+	},
+	'operator': /!=?|\*\*?|==|&&?|\|\|?|<[=<]?|>[=>]?|[-+~\/%?^]|\b(?:eq|ne|in|ni)\b/,
+	'punctuation': /[{}()\[\]]/
+};