|
static private CreateObjectFromAttributeText ( string valueText, |
||
| valueText | string | |
| targetType | ||
| scope | ||
| return | object | |
internal override object GetValueFor(XamlPropertyInfo targetProperty)
{
if (ParentProperty == null)
{
throw new InvalidOperationException("Cannot call GetValueFor while ParentProperty is null");
}
if (targetProperty == null)
{
return(this.Text);
}
return(XamlParser.CreateObjectFromAttributeText(Text, targetProperty, ParentProperty.ParentObject));
}
internal override object GetValueFor(XamlPropertyInfo targetProperty)
{
if (IsMarkupExtension)
{
var value = ProvideValue();
if (value is string && targetProperty != null && targetProperty.ReturnType != typeof(string))
{
return(XamlParser.CreateObjectFromAttributeText((string)value, targetProperty, this));
}
return(value);
}
else
{
return(instance);
}
}
public static XamlObject Parse(string text, XamlObject parent, XmlAttribute attribute)
{
var tokens = MarkupExtensionTokenizer.Tokenize(text);
if (tokens.Count < 3 ||
tokens[0].Kind != MarkupExtensionTokenKind.OpenBrace ||
tokens[1].Kind != MarkupExtensionTokenKind.TypeName ||
tokens[tokens.Count - 1].Kind != MarkupExtensionTokenKind.CloseBrace)
{
throw new XamlMarkupExtensionParseException("Invalid markup extension");
}
var typeResolver = parent.ServiceProvider.Resolver;
string typeName = tokens[1].Value;
Type extensionType = typeResolver.Resolve(typeName + "Extension");
if (extensionType == null)
{
extensionType = typeResolver.Resolve(typeName);
}
if (extensionType == null || !typeof(MarkupExtension).IsAssignableFrom(extensionType))
{
throw new XamlMarkupExtensionParseException("Unknown markup extension " + typeName + "Extension");
}
List <string> positionalArgs = new List <string>();
List <KeyValuePair <string, string> > namedArgs = new List <KeyValuePair <string, string> >();
for (int i = 2; i < tokens.Count - 1; i++)
{
if (tokens[i].Kind == MarkupExtensionTokenKind.String)
{
positionalArgs.Add(tokens[i].Value);
}
else if (tokens[i].Kind == MarkupExtensionTokenKind.Membername)
{
if (tokens[i + 1].Kind != MarkupExtensionTokenKind.Equals ||
tokens[i + 2].Kind != MarkupExtensionTokenKind.String)
{
throw new XamlMarkupExtensionParseException("Invalid markup extension");
}
namedArgs.Add(new KeyValuePair <string, string>(tokens[i].Value, tokens[i + 2].Value));
i += 2;
}
}
// Find the constructor with positionalArgs.Count arguments
var ctors = extensionType.GetConstructors().Where(c => c.GetParameters().Length == positionalArgs.Count).ToList();
if (ctors.Count < 1)
{
throw new XamlMarkupExtensionParseException("No constructor for " +
extensionType.FullName + " found that takes " + positionalArgs.Count + " arguments");
}
if (ctors.Count > 1)
{
Debug.WriteLine("Multiple constructors for " +
extensionType.FullName + " found that take " + positionalArgs.Count + " arguments");
}
var ctor = ctors[0];
var defaultCtor = extensionType.GetConstructor(Type.EmptyTypes);
bool mappingToProperties = defaultCtor != null;
List <PropertyInfo> map = new List <PropertyInfo>();
if (mappingToProperties)
{
foreach (var param in ctor.GetParameters())
{
var prop = extensionType.GetProperty(param.Name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);
if (prop == null)
{
mappingToProperties = false;
break;
}
map.Add(prop);
}
}
object instance;
if (mappingToProperties)
{
instance = defaultCtor.Invoke(null);
}
else
{
var ctorParamsInfo = ctor.GetParameters();
var ctorParams = new object[ctorParamsInfo.Length];
for (int i = 0; i < ctorParams.Length; i++)
{
var paramType = ctorParamsInfo[i].ParameterType;
ctorParams[i] = XamlParser.CreateObjectFromAttributeText(positionalArgs[i], paramType, parent);
}
instance = ctor.Invoke(ctorParams);
//TODO
//XamlObject.ConstructorArgsProperty - args collection
//Reinvoke ctor when needed
}
XamlObject result = parent.OwnerDocument.CreateObject(instance);
if (attribute != null)
{
result.XmlAttribute = attribute;
}
result.ParentObject = parent;
if (mappingToProperties)
{
for (int i = 0; i < positionalArgs.Count; i++)
{
var a = parent.OwnerDocument.XmlDocument.CreateAttribute(map[i].Name);
a.Value = positionalArgs[i];
XamlParser.ParseObjectAttribute(result, a, false);
}
}
foreach (var pair in namedArgs)
{
var a = parent.OwnerDocument.XmlDocument.CreateAttribute(pair.Key);
a.Value = pair.Value;
XamlParser.ParseObjectAttribute(result, a, false);
}
return(result);
}