Added Sieve parser code in master

dev/Sieve/Extensions/rfc5229.js

@@ -0,0 +1,78 @@
+/**
+ * https://tools.ietf.org/html/rfc5229
+ */
+
+import {
+	GrammarCommand,
+	GrammarQuotedString,
+	GrammarStringList,
+	GrammarTest
+} from 'Sieve/Grammar';
+
+export class SetCommand extends GrammarCommand
+{
+	constructor()
+	{
+		super();
+		this.modifiers = [];
+		this._name    = new GrammarQuotedString;
+		this._value   = new GrammarQuotedString;
+	}
+
+	get require() { return 'variables'; }
+
+	toString()
+	{
+		return 'set'
+			+ ' ' + this.modifiers.join(' ')
+			+ ' ' + this._name
+			+ ' ' + this._value;
+	}
+
+	get name()     { return this._name.value; }
+	set name(str)  { this._name.value = str; }
+
+	get value()    { return this._value.value; }
+	set value(str) { this._value.value = str; }
+
+	pushArguments(args)
+	{
+		[':lower', ':upper', ':lowerfirst', ':upperfirst', ':quotewildcard', ':length'].forEach(modifier => {
+			args.includes(modifier) && this.modifiers.push(modifier);
+		});
+		this._name  = args[args.length-2];
+		this._value = args[args.length-1];
+	}
+}
+
+export class StringCommand extends GrammarTest
+{
+	constructor()
+	{
+		super();
+		this.source   = new GrammarStringList;
+		this.key_list = new GrammarStringList;
+	}
+
+	toString()
+	{
+		return 'string'
+			+ ' ' + this.match_type
+			+ (this.comparator ? ' :comparator ' + this.comparator : '')
+			+ ' ' + this.source.toString()
+			+ ' ' + this.key_list.toString();
+	}
+
+	pushArguments(args)
+	{
+		this.source   = args[args.length-2];
+		this.key_list = args[args.length-1];
+	}
+}
+
+/*
+Object.assign(Sieve.Commands, {
+	set: SetCommand,
+	string: StringCommand
+});
+*/