Mon 21 Jul 22:43:21 CEST 2025

js/ui/mxgraph/src/js/io/mxStylesheetCodec.js

@@ -0,0 +1,217 @@
+/**
+ * Copyright (c) 2006-2015, JGraph Ltd
+ * Copyright (c) 2006-2015, Gaudenz Alder
+ */
+/**
+ * Class: mxStylesheetCodec
+ *
+ * Codec for <mxStylesheet>s. This class is created and registered
+ * dynamically at load time and used implicitely via <mxCodec>
+ * and the <mxCodecRegistry>.
+ */
+var mxStylesheetCodec = mxCodecRegistry.register(function()
+{
+	var codec = new mxObjectCodec(new mxStylesheet());
+
+	/**
+	 * Function: encode
+	 *
+	 * Encodes a stylesheet. See <decode> for a description of the
+	 * format.
+	 */
+	codec.encode = function(enc, obj)
+	{
+		var node = enc.document.createElement(this.getName());
+		
+		for (var i in obj.styles)
+		{
+			var style = obj.styles[i];
+			var styleNode = enc.document.createElement('add');
+			
+			if (i != null)
+			{
+				styleNode.setAttribute('as', i);
+				
+				for (var j in style)
+				{
+					var value = this.getStringValue(j, style[j]);
+					
+					if (value != null)
+					{
+						var entry = enc.document.createElement('add');
+						entry.setAttribute('value', value);
+						entry.setAttribute('as', j);
+						styleNode.appendChild(entry);
+					}
+				}
+				
+				if (styleNode.childNodes.length > 0)
+				{
+					node.appendChild(styleNode);
+				}
+			}
+		}
+		
+	    return node;
+	};
+
+	/**
+	 * Function: getStringValue
+	 *
+	 * Returns the string for encoding the given value.
+	 */
+	codec.getStringValue = function(key, value)
+	{
+		var type = typeof(value);
+		
+		if (type == 'function')
+		{
+			value = mxStyleRegistry.getName(style[j]);
+		}
+		else if (type == 'object')
+		{
+			value = null;
+		}
+		
+		return value;
+	};
+	
+	/**
+	 * Function: decode
+	 *
+	 * Reads a sequence of the following child nodes
+	 * and attributes:
+	 *
+	 * Child Nodes:
+	 *
+	 * add - Adds a new style.
+	 *
+	 * Attributes:
+	 *
+	 * as - Name of the style.
+	 * extend - Name of the style to inherit from.
+	 *
+	 * Each node contains another sequence of add and remove nodes with the following
+	 * attributes:
+	 *
+	 * as - Name of the style (see <mxConstants>).
+	 * value - Value for the style.
+	 *
+	 * Instead of the value-attribute, one can put Javascript expressions into
+	 * the node as follows if <mxStylesheetCodec.allowEval> is true:
+	 * <add as="perimeter">mxPerimeter.RectanglePerimeter</add>
+	 *
+	 * A remove node will remove the entry with the name given in the as-attribute
+	 * from the style.
+	 * 
+	 * Example:
+	 *
+	 * (code)
+	 * <mxStylesheet as="stylesheet">
+	 *   <add as="text">
+	 *     <add as="fontSize" value="12"/>
+	 *   </add>
+	 *   <add as="defaultVertex" extend="text">
+	 *     <add as="shape" value="rectangle"/>
+	 *   </add>
+	 * </mxStylesheet>
+	 * (end)
+	 */
+	codec.decode = function(dec, node, into)
+	{
+		var obj = into || new this.template.constructor();
+		var id = node.getAttribute('id');
+		
+		if (id != null)
+		{
+			dec.objects[id] = obj;
+		}
+		
+		node = node.firstChild;
+		
+		while (node != null)
+		{
+			if (!this.processInclude(dec, node, obj) && node.nodeName == 'add')
+			{
+				var as = node.getAttribute('as');
+				
+				if (as != null)
+				{
+					var extend = node.getAttribute('extend');
+					var style = (extend != null) ? mxUtils.clone(obj.styles[extend]) : null;
+					
+					if (style == null)
+					{
+						if (extend != null)
+						{
+							mxLog.warn('mxStylesheetCodec.decode: stylesheet ' +
+								extend + ' not found to extend');
+						}
+						
+						style = new Object();
+					}
+					
+					var entry = node.firstChild;
+					
+					while (entry != null)
+					{
+						if (entry.nodeType == mxConstants.NODETYPE_ELEMENT)
+						{
+						 	var key = entry.getAttribute('as');
+						 	
+						 	if (entry.nodeName == 'add')
+						 	{
+							 	var text = mxUtils.getTextContent(entry);
+							 	var value = null;
+							 	
+							 	if (text != null && text.length > 0 && mxStylesheetCodec.allowEval)
+							 	{
+							 		value = mxUtils.eval(text);
+							 	}
+							 	else
+							 	{
+							 		value = entry.getAttribute('value');
+							 		
+							 		if (mxUtils.isNumeric(value))
+							 		{
+										value = parseFloat(value);
+									}
+							 	}
+
+							 	if (value != null)
+							 	{
+							 		style[key] = value;
+							 	}
+						 	}
+						 	else if (entry.nodeName == 'remove')
+						 	{
+						 		delete style[key];
+						 	}
+						}
+						
+						entry = entry.nextSibling;
+					}
+					
+					obj.putCellStyle(as, style);
+				}
+			}
+			
+			node = node.nextSibling;
+		}
+		
+		return obj;
+	};
+
+	// Returns the codec into the registry
+	return codec;
+
+}());
+
+/**
+ * Variable: allowEval
+ * 
+ * Static global switch that specifies if the use of eval is allowed for
+ * evaluating text content. Default is true. Set this to false if stylesheets
+ * may contain user input.
+ */
+mxStylesheetCodec.allowEval = true;