svg

src/protocal/svg.js

+KityMinder.registerProtocal( "svg", function () {
+	var LINE_ENDING = '\n',
+		TAB_CHAR = '\t';
+
+	function repeat( s, n ) {
+		var result = "";
+		while ( n-- ) result += s;
+		return result;
+	}
+
+	function encode( json, level ) {
+		var local = "";
+		level = level || 0;
+		local += repeat( TAB_CHAR, level );
+		local += json.data.text + LINE_ENDING;
+		if ( json.children ) {
+			json.children.forEach( function ( child ) {
+				local += encode( child, level + 1 );
+			} );
+		}
+		return local;
+	}
+
+	function isEmpty( line ) {
+		return !/\S/.test( line );
+	}
+
+	function getLevel( line ) {
+		var level = 0;
+		while ( line.charAt( level ) === TAB_CHAR ) level++;
+		return level;
+	}
+
+	function getNode( line ) {
+		return {
+			data: {
+				text: line.replace( new RegExp( '^' + TAB_CHAR + '*' ), '' )
+			}
+		};
+	}
+
+	function decode( local ) {
+		var json,
+			parentMap = {},
+			lines = local.split( LINE_ENDING ),
+			line, level, node;
+
+		function addChild( parent, child ) {
+			var children = parent.children || ( parent.children = [] );
+			children.push( child );
+		}
+
+		for ( var i = 0; i < lines.length; i++ ) {
+			line = lines[ i ];
+			if ( isEmpty( line ) ) continue;
+
+			level = getLevel( line );
+			node = getNode( line );
+
+			if ( level === 0 ) {
+				if ( json ) {
+					throw new Error( 'Invalid local format' );
+				}
+				json = node;
+			} else {
+				if ( !parentMap[ level - 1 ] ) {
+					throw new Error( 'Invalid local format' );
+				}
+				addChild( parentMap[ level - 1 ], node );
+			}
+			parentMap[ level ] = node;
+		}
+		return json;
+	}
+	var lastTry, lastResult;
+
+	function recognize( local ) {
+		if ( !Utils.isString( local ) ) return false;
+		lastTry = local;
+		try {
+			lastResult = decode( local );
+		} catch ( e ) {
+			lastResult = null;
+		}
+		return !!lastResult;
+	}
+	return {
+		fileDescription: 'svg',
+		fileExtension: '.svg',
+		encode: function ( json ) {
+			return encode( json, 0 );
+		},
+		decode: function ( local ) {
+			if ( lastTry == local && lastResult ) {
+				return lastResult;
+			}
+			return decode( local );
+		},
+		recognize: recognize,
+		recognizePriority: -1
+	};
+} );
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