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using System;
using System.Reflection;
namespace Xamarin.Forms.Xaml
{
internal sealed class MarkupExtensionParser : MarkupExpressionParser, IExpressionParser<object>
{
IMarkupExtension markupExtension;
public object Parse(string match, ref string remaining, IServiceProvider serviceProvider)
{
var typeResolver = serviceProvider.GetService(typeof (IXamlTypeResolver)) as IXamlTypeResolver;
//shortcut for Binding and StaticResource, to avoid too many reflection calls.
if (match == "Binding")
markupExtension = new BindingExtension();
else if (match == "TemplateBinding")
markupExtension = new TemplateBindingExtension();
else if (match == "StaticResource")
markupExtension = new StaticResourceExtension();
else
{
if (typeResolver == null)
return null;
Type type;
//The order of lookup is to look for the Extension-suffixed class name first and then look for the class name without the Extension suffix.
if (!typeResolver.TryResolve(match + "Extension", out type) && !typeResolver.TryResolve(match, out type))
{
var lineInfoProvider = serviceProvider.GetService(typeof (IXmlLineInfoProvider)) as IXmlLineInfoProvider;
var lineInfo = (lineInfoProvider != null) ? lineInfoProvider.XmlLineInfo : new XmlLineInfo();
throw new XamlParseException(String.Format("MarkupExtension not found for {0}", match), lineInfo);
}
markupExtension = Activator.CreateInstance(type) as IMarkupExtension;
}
if (markupExtension == null)
{
var lineInfoProvider = serviceProvider.GetService(typeof (IXmlLineInfoProvider)) as IXmlLineInfoProvider;
var lineInfo = (lineInfoProvider != null) ? lineInfoProvider.XmlLineInfo : new XmlLineInfo();
throw new XamlParseException(String.Format("Missing public default constructor for MarkupExtension {0}", match),
lineInfo);
}
char next;
if (remaining == "}")
return markupExtension.ProvideValue(serviceProvider);
string piece;
while ((piece = GetNextPiece(ref remaining, out next)) != null)
HandleProperty(piece, serviceProvider, ref remaining, next != '=');
return markupExtension.ProvideValue(serviceProvider);
}
protected override void SetPropertyValue(string prop, string strValue, object value, IServiceProvider serviceProvider)
{
MethodInfo setter;
if (prop == null)
{
//implicit property
var t = markupExtension.GetType();
prop = ApplyPropertiesVisitor.GetContentPropertyName(t.GetTypeInfo());
if (prop == null)
return;
setter = t.GetRuntimeProperty(prop).SetMethod;
}
else
setter = markupExtension.GetType().GetRuntimeProperty(prop).SetMethod;
if (value == null && strValue != null)
{
value = strValue.ConvertTo(markupExtension.GetType().GetRuntimeProperty(prop).PropertyType,
(Func<TypeConverter>)null, serviceProvider);
}
setter.Invoke(markupExtension, new[] { value });
}
}
}
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