Added Sieve parser code in master

dev/Sieve/Extensions/rfc5293.js

@@ -0,0 +1,91 @@
+/**
+ * https://tools.ietf.org/html/rfc5293
+ */
+
+import {
+	GrammarCommand,
+	GrammarNumber,
+	GrammarQuotedString,
+	GrammarString,
+	GrammarStringList
+} from 'Sieve/Grammar';
+
+export class AddHeaderCommand extends GrammarCommand
+{
+	constructor()
+	{
+		super();
+		this.last       = false;
+		this.field_name = new GrammarQuotedString;
+		this.value      = new GrammarQuotedString;
+	}
+
+	get require() { return 'editheader'; }
+
+	toString()
+	{
+		return this.identifier
+			+ (this.last ? ' :last' : '')
+			+ ' ' + this.field_name
+			+ ' ' + this.value + ';';
+	}
+
+	pushArguments(args)
+	{
+		this.last = args.includes(':last');
+		this.field_name = args[args.length - 2];
+		this.value = args[args.length - 1];
+	}
+}
+
+export class DeleteHeaderCommand extends GrammarCommand
+{
+	constructor()
+	{
+		super();
+		this.index          = new GrammarNumber;
+		this.last           = false;
+		this.comparator     = '',
+		this.match_type     = ':is',
+		this.field_name     = new GrammarQuotedString;
+		this.value_patterns = new GrammarStringList;
+	}
+
+	get require() { return 'editheader'; }
+
+	toString()
+	{
+		return this.identifier
+			+ (this.last ? ' :last' : (this.index.value ? ' :index ' + this.index : ''))
+			+ (this.comparator ? ' :comparator ' + this.comparator : '')
+			+ ' ' + this.match_type
+			+ ' ' + this.field_name
+			+ ' ' + this.value_patterns + ';';
+	}
+
+	pushArguments(args)
+	{
+		let l = args.length - 1;
+		args.forEach((arg, i) => {
+			if (':last' === arg) {
+				this.last = true;
+			} else if (':index' === args[i-1]) {
+				this.index.value = arg.value;
+				args[i] = null;
+			}
+		});
+
+		if (args[l-1] instanceof GrammarString) {
+			this.field_name = args[l-1];
+			this.value_patterns = args[l];
+		} else {
+			this.field_name = args[l];
+		}
+	}
+}
+/*
+Object.assign(Sieve.Commands, {
+	addheader: AddHeaderCommand,
+	deleteheader: DeleteHeaderCommand
+});
+*/