Added rfc6609

dev/Sieve/Extensions/rfc6609.js

@@ -0,0 +1,63 @@
+/**
+ * https://tools.ietf.org/html/rfc6609
+ */
+
+(Sieve => {
+
+const Grammar = Sieve.Grammar;
+
+class Include extends Grammar.Command
+{
+	constructor()
+	{
+		super('include');
+		this.global = false; // ':personal' / ':global';
+		this.once = false;
+		this.optional = false;
+		this.value = new Grammar.QuotedString;
+	}
+
+	get require() { return 'include'; }
+
+	toString()
+	{
+		return this.identifier
+			+ (this.global ? ' :global' : '')
+			+ (this.once ? ' :once' : '')
+			+ (this.optional ? ' :optional' : '')
+			+ ' ' + this.value + ';';
+	}
+
+	pushArguments(args)
+	{
+		args.forEach(arg => {
+			if (':global' === arg || ':once' === arg || ':optional' === arg) {
+				this[arg.substr(1)] = true;
+			} else if (arg instanceof Grammar.QuotedString) {
+				this.value = arg;
+			}
+		});
+	}
+}
+
+class Return extends Grammar.Command
+{
+	constructor()
+	{
+		super('return');
+	}
+
+	get require() { return 'include'; }
+
+	toString()
+	{
+		return 'return;';
+	}
+}
+
+Object.assign(Sieve.Commands, {
+	include: Include,
+	return: Return
+});
+
+})(this.Sieve);