Added Sieve parser code in master

dev/Sieve/Extensions/rfc5173.js

@@ -0,0 +1,47 @@
+/**
+ * https://tools.ietf.org/html/rfc5173
+ */
+
+import {
+	GrammarString,
+	GrammarStringList,
+	GrammarTest
+} from 'Sieve/Grammar';
+
+export class BodyCommand extends GrammarTest
+{
+	constructor()
+	{
+		super();
+		this.body_transform = ''; // :raw, :content <string-list>, :text
+		this.key_list = new GrammarStringList;
+	}
+
+	get require() { return 'body'; }
+
+	toString()
+	{
+		return 'body'
+			+ (this.comparator ? ' :comparator ' + this.comparator : '')
+			+ ' ' + this.match_type
+			+ ' ' + this.body_transform
+			+ ' ' + this.key_list.toString();
+	}
+
+	pushArguments(args)
+	{
+		args.forEach((arg, i) => {
+			if (':raw' === arg || ':text' === arg) {
+				this.body_transform = arg;
+			} else if (arg instanceof GrammarStringList || arg instanceof GrammarString) {
+				if (':content' === args[i-1]) {
+					this.body_transform = ':content ' + arg;
+				} else {
+					this[args[i+1] ? 'content_list' : 'key_list'] = arg;
+				}
+			}
+		});
+	}
+}
+
+//Sieve.Commands.body = BodyCommand;