private SvgElement CreateElement <T>(XmlReader reader, bool fragmentIsDocument, SvgDocument document) where T : SvgDocument, new()
{
SvgElement createdElement = null;
string elementName = reader.LocalName;
string elementNS = reader.NamespaceURI;
//Trace.TraceInformation("Begin CreateElement: {0}", elementName);
if (elementNS == SvgNamespace.UriString || string.IsNullOrEmpty(elementNS))
{
if (elementName == "svg")
{
createdElement = (fragmentIsDocument) ? new T() : new SvgFragment();
}
else
{
#if !USE_SOURCE_GENERATORS
ElementInfo validType;
if (availableElementsWithoutSvg.TryGetValue(elementName, out validType))
{
createdElement = (SvgElement)Activator.CreateInstance(validType.ElementType);
}
#else
if (availableElementsWithoutSvg.TryGetValue(elementName, out var validType))
{
createdElement = validType.CreateInstance();
}
#endif
else
{
createdElement = new SvgUnknownElement(elementName);
}
}
if (createdElement != null)
{
SetAttributes(createdElement, reader, document);
}
}
else
{
// All non svg element (html, ...)
createdElement = new NonSvgElement(elementName, elementNS);
SetAttributes(createdElement, reader, document);
}
//Trace.TraceInformation("End CreateElement");
return(createdElement);
}
private SvgElement CreateElement <T>(XmlReader reader, bool fragmentIsDocument, SvgDocument document) where T : SvgDocument, new()
{
SvgElement createdElement = null;
string elementName = reader.LocalName;
string elementNS = reader.NamespaceURI;
//Trace.TraceInformation("Begin CreateElement: {0}", elementName);
if (elementNS == SvgAttributeAttribute.SvgNamespace || string.IsNullOrEmpty(elementNS))
{
if (elementName == "svg")
{
createdElement = (fragmentIsDocument) ? new T() : new SvgFragment();
}
else
{
ElementInfo validType;
if (AvailableElements.Where(e => !e.ElementName.Equals("svg", StringComparison.OrdinalIgnoreCase))
.ToDictionary(e => e.ElementName, e => e).TryGetValue(elementName, out validType))
{
createdElement = (SvgElement)Activator.CreateInstance(validType.ElementType);
}
else
{
createdElement = new SvgUnknownElement(elementName);
}
}
if (createdElement != null)
{
SetAttributes(createdElement, reader, document);
}
}
else
{
// All non svg element (html, ...)
createdElement = new NonSvgElement(elementName);
SetAttributes(createdElement, reader, document);
}
//Trace.TraceInformation("End CreateElement");
return(createdElement);
}
private static SvgElement CreateElement <T>(XmlReader reader, bool fragmentIsDocument, SvgDocument document) where T : SvgDocument, new()
{
SvgElement createdElement = null;
string elementName = reader.LocalName;
string elementNS = reader.NamespaceURI;
//Trace.TraceInformation("Begin CreateElement: {0}", elementName);
if (elementNS == svgNS)
{
if (elementName == "svg")
{
createdElement = (fragmentIsDocument) ? new T() : new SvgFragment();
}
else
{
ElementInfo validType = AvailableElements.SingleOrDefault(e => e.ElementName == elementName);
if (validType != null)
{
createdElement = (SvgElement)Activator.CreateInstance(validType.ElementType);
}
else
{
createdElement = new SvgUnknownElement(elementName);
}
}
if (createdElement != null)
{
SetAttributes(createdElement, reader, document);
}
}
else
{
// All non svg element (html, ...)
createdElement = new NonSvgElement(elementName);
SetAttributes(createdElement, reader, document);
}
//Trace.TraceInformation("End CreateElement");
return(createdElement);
}
private static T Open <T>(XmlReader reader) where T : SvgDocument, new()
{
if (!SkipGdiPlusCapabilityCheck)
{
EnsureSystemIsGdiPlusCapable(); //Validate whether the GDI+ can be loaded, this will yield an exception if not
}
var elementStack = new Stack <SvgElement>();
bool elementEmpty;
SvgElement element = null;
SvgElement parent;
T svgDocument = null;
var elementFactory = new SvgElementFactory();
var styles = new List <ISvgNode>();
while (reader.Read())
{
try
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
// Does this element have a value or children
// (Must do this check here before we progress to another node)
elementEmpty = reader.IsEmptyElement;
// Create element
if (elementStack.Count > 0)
{
element = elementFactory.CreateElement(reader, svgDocument);
}
else
{
svgDocument = elementFactory.CreateDocument <T>(reader);
element = svgDocument;
}
// Add to the parents children
if (elementStack.Count > 0)
{
parent = elementStack.Peek();
if (parent != null && element != null)
{
parent.Children.Add(element);
parent.Nodes.Add(element);
}
}
// Push element into stack
elementStack.Push(element);
// Need to process if the element is empty
if (elementEmpty)
{
goto case XmlNodeType.EndElement;
}
break;
case XmlNodeType.EndElement:
// Pop the element out of the stack
element = elementStack.Pop();
if (element.Nodes.OfType <SvgContentNode>().Any())
{
element.Content = (from e in element.Nodes select e.Content).Aggregate((p, c) => p + c);
}
else
{
element.Nodes.Clear(); // No sense wasting the space where it isn't needed
}
if (element is SvgUnknownElement unknown && unknown.ElementName == "style")
{
styles.Add(unknown);
}
break;
case XmlNodeType.CDATA:
case XmlNodeType.Text:
case XmlNodeType.SignificantWhitespace:
element = elementStack.Peek();
element.Nodes.Add(new SvgContentNode()
{
Content = reader.Value
});
break;
case XmlNodeType.EntityReference:
reader.ResolveEntity();
element = elementStack.Peek();
element.Nodes.Add(new SvgContentNode()
{
Content = reader.Value
});
break;
}
}
catch (Exception exc)
{
Trace.TraceError(exc.Message);
}
}
if (styles.Any())
{
var cssTotal = styles.Select((s) => s.Content).Aggregate((p, c) => p + Environment.NewLine + c);
var cssParser = new Parser();
var sheet = cssParser.Parse(cssTotal);
foreach (var rule in sheet.StyleRules)
{
try
{
var rootNode = new NonSvgElement();
rootNode.Children.Add(svgDocument);
var elemsToStyle = rootNode.QuerySelectorAll(rule.Selector.ToString(), elementFactory);
foreach (var elem in elemsToStyle)
{
foreach (var decl in rule.Declarations)
{
elem.AddStyle(decl.Name, decl.Term.ToString(), rule.Selector.GetSpecificity());
}
}
}
catch (Exception ex)
{
Trace.TraceWarning(ex.Message);
}
}
}
svgDocument?.FlushStyles(true);
return(svgDocument);
}
private static T Open <T>(XmlReader reader) where T : SvgDocument, new()
{
try
{
var elementStack = new Stack <SvgElement>();
bool elementEmpty;
SvgElement element = null;
SvgElement parent;
T svgDocument = null;
var elementFactory = new SvgElementFactory();
var styles = new List <ISvgNode>();
while (reader.Read())
{
try
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
// Does this element have a value or children
// (Must do this check here before we progress to another node)
elementEmpty = reader.IsEmptyElement;
// Create element
if (elementStack.Count > 0)
{
element = elementFactory.CreateElement(reader, svgDocument);
}
else
{
svgDocument = elementFactory.CreateDocument <T>(reader);
element = svgDocument;
}
// Add to the parents children
if (elementStack.Count > 0)
{
parent = elementStack.Peek();
if (parent != null && element != null)
{
parent.Children.Add(element);
parent.Nodes.Add(element);
}
}
// Push element into stack
elementStack.Push(element);
// Need to process if the element is empty
if (elementEmpty)
{
goto case XmlNodeType.EndElement;
}
break;
case XmlNodeType.EndElement:
// Pop the element out of the stack
element = elementStack.Pop();
if (element.Nodes.OfType <SvgContentNode>().Any())
{
element.Content = (from e in element.Nodes select e.Content).Aggregate((p, c) => p + c);
}
else
{
element.Nodes.Clear(); // No sense wasting the space where it isn't needed
}
var unknown = element as SvgUnknownElement;
if (unknown != null && unknown.ElementName == "style")
{
styles.Add(unknown);
}
break;
case XmlNodeType.CDATA:
case XmlNodeType.Text:
element = elementStack.Peek();
element.Nodes.Add(new SvgContentNode()
{
Content = reader.Value
});
break;
case XmlNodeType.EntityReference:
reader.ResolveEntity();
element = elementStack.Peek();
element.Nodes.Add(new SvgContentNode()
{
Content = reader.Value
});
break;
}
}
catch (Exception exc)
{
Trace.TraceError(exc.Message);
if (ExceptionCaughtIsGdiPlusRelated(exc))
{
throw;
} // GDI+ errors should be rethrown
}
}
if (styles.Any())
{
var cssTotal = styles.Select((s) => s.Content).Aggregate((p, c) => p + Environment.NewLine + c);
var cssParser = new Parser();
var sheet = cssParser.Parse(cssTotal);
AggregateSelectorList aggList;
IEnumerable <BaseSelector> selectors;
IEnumerable <SvgElement> elemsToStyle;
foreach (var rule in sheet.StyleRules)
{
aggList = rule.Selector as AggregateSelectorList;
if (aggList != null && aggList.Delimiter == ",")
{
selectors = aggList;
}
else
{
selectors = Enumerable.Repeat(rule.Selector, 1);
}
foreach (var selector in selectors)
{
try
{
var rootNode = new NonSvgElement();
rootNode.Children.Add(svgDocument);
elemsToStyle = rootNode.QuerySelectorAll(rule.Selector.ToString(), elementFactory);
foreach (var elem in elemsToStyle)
{
foreach (var decl in rule.Declarations)
{
elem.AddStyle(decl.Name, decl.Term.ToString(), rule.Selector.GetSpecificity());
}
}
}
catch (Exception ex)
{
Trace.TraceWarning(ex.Message);
if (ExceptionCaughtIsGdiPlusRelated(ex))
{
throw;
} // GDI+ errors should be rethrown
}
}
}
}
if (svgDocument != null)
{
FlushStyles(svgDocument);
}
return(svgDocument);
}
// GDI+ loading errors will result in TypeInitializationExceptions,
// for readability we will catch and wrap the error
catch (Exception e)
{
if (ExceptionCaughtIsGdiPlusRelated(e))
{
// Throw only the customized exception if we are sure GDI+ is causing the problem
throw new SvgGdiPlusCannotBeLoadedException(e);
}
// No wrapping, just rethrow the exception
throw;
}
}
