Copying serializer code to VisualEditor extension

modules/es/es.JsonSerializer.js

@@ -0,0 +1,100 @@
+/**
+ * Serializes a WikiDom into JSON.
+ * 
+ * @class
+ * @constructor
+ * @extends {es.Serializer}
+ * @property options {Object} List of options for serialization
+ * @property options.indentWith {String} Text to use as indentation, such as \t or 4 spaces
+ */
+es.JsonSerializer = function( options ) {
+	es.Serializer.call( this );
+	this.options = $.extend( {
+		'indentWith': '\t'
+	}, options || {} );
+};
+
+/* Static Methods */
+
+es.JsonSerializer.typeOf = function( value ) {
+	if ( typeof value === 'object' ) {
+		if ( value === null ) {
+			return 'null';
+		}
+		switch ( value.constructor ) {
+			case [].constructor:
+				return 'array';
+			case ( new Date() ).constructor:
+				return 'date';
+			case ( new RegExp() ).constructor:
+				return 'regex';
+			default:
+				return 'object';
+		}
+	}
+	return typeof value;
+};
+
+es.JsonSerializer.prototype.encode = function( data, indention ) {
+	if ( indention === undefined ) {
+		indention = '';
+	}
+	var type = es.JsonSerializer.typeOf( data ),
+		key;
+	
+	// Open object/array
+	var json = '';
+	if ( type === 'array' ) {
+		if (data.length === 0) {
+			// Empty array
+			return '[]';
+		}
+		json += '[';
+	} else {
+		var empty = true;
+		for ( key in data ) {
+			if ( data.hasOwnProperty( key ) ) {
+				empty = false;
+				break;
+			}
+		}
+		if ( empty ) {
+			return '{}';
+		}
+		json += '{';
+	}
+	
+	// Iterate over items
+	var comma = false;
+	for ( key in data ) {
+		if ( data.hasOwnProperty( key ) ) {
+			json += ( comma ? ',' : '' ) + '\n' + indention + this.options.indentWith +
+				( type === 'array' ? '' : '"' + key + '"' + ': ' );
+			switch ( es.JsonSerializer.typeOf( data[key] ) ) {
+				case 'array':
+				case 'object':
+					json += this.encode( data[key], indention + this.options.indentWith );
+					break;
+				case 'boolean':
+				case 'number':
+					json += data[key].toString();
+					break;
+				case 'null':
+					json += 'null';
+					break;
+				case 'string':
+					json += '"' + data[key]
+						.replace(/[\n]/g, '\\n')
+						.replace(/[\t]/g, '\\t') + '"';
+					break;
+				// Skip other types
+			}
+			comma = true;
+		}
+	}
+	
+	// Close object/array
+	json += '\n' + indention + ( type === 'array' ? ']' : '}' );
+	
+	return json;
+};