update elements and fix some bugs

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

Index: lib/src/prism/components/prism-prolog.js
diff --git a/lib/src/prism/components/prism-prolog.js b/lib/src/prism/components/prism-prolog.js
new file mode 100644
index 0000000000000000000000000000000000000000..86c04d4aae573f94005552ec7912e986ac7b11e3
--- /dev/null
+++ b/lib/src/prism/components/prism-prolog.js
@@ -0,0 +1,17 @@
+Prism.languages.prolog = {
+	// Syntax depends on the implementation
+	'comment': [
+		/%.+/,
+		/\/\*[\s\S]*?\*\//
+	],
+	// Depending on the implementation, strings may allow escaped newlines and quote-escape
+	'string': /(["'])(?:\1\1|\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
+	'builtin': /\b(?:fx|fy|xf[xy]?|yfx?)\b/,
+	'variable': /\b[A-Z_]\w*/,
+	// FIXME: Should we list all null-ary predicates (not followed by a parenthesis) like halt, trace, etc.?
+	'function': /\b[a-z]\w*(?:(?=\()|\/\d+)/,
+	'number': /\b\d+\.?\d*/,
+	// Custom operators are allowed
+	'operator': /[:\\=><\-?*@\/;+^|!$.]+|\b(?:is|mod|not|xor)\b/,
+	'punctuation': /[(){}\[\],]/
+};