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SetPropertiesVisitor.cs
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SetPropertiesVisitor.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using Mono.Cecil;
using Mono.Cecil.Cil;
using Mono.Cecil.Rocks;
using Xamarin.Forms.Internals;
using Xamarin.Forms.Xaml;
using static Mono.Cecil.Cil.Instruction;
using static Mono.Cecil.Cil.OpCodes;
namespace Xamarin.Forms.Build.Tasks
{
class SetPropertiesVisitor : IXamlNodeVisitor
{
static int dtcount;
static int typedBindingCount;
static readonly IList<XmlName> skips = new List<XmlName>
{
XmlName.xKey,
XmlName.xTypeArguments,
XmlName.xArguments,
XmlName.xFactoryMethod,
XmlName.xName,
XmlName.xDataType
};
public SetPropertiesVisitor(ILContext context, bool stopOnResourceDictionary = false)
{
Context = context;
Module = context.Body.Method.Module;
StopOnResourceDictionary = stopOnResourceDictionary;
}
public ILContext Context { get; }
public bool StopOnResourceDictionary { get; }
public TreeVisitingMode VisitingMode => TreeVisitingMode.BottomUp;
public bool StopOnDataTemplate => true;
public bool VisitNodeOnDataTemplate => true;
public bool SkipChildren(INode node, INode parentNode) => false;
public bool IsResourceDictionary(ElementNode node)
{
var parentVar = Context.Variables[(IElementNode)node];
return parentVar.VariableType.FullName == "Xamarin.Forms.ResourceDictionary"
|| parentVar.VariableType.Resolve().BaseType?.FullName == "Xamarin.Forms.ResourceDictionary";
}
ModuleDefinition Module { get; }
public void Visit(ValueNode node, INode parentNode)
{
//TODO support Label text as element
XmlName propertyName;
if (!TryGetPropertyName(node, parentNode, out propertyName))
{
if (!IsCollectionItem(node, parentNode))
return;
string contentProperty;
if (!Context.Variables.ContainsKey((IElementNode)parentNode))
return;
var parentVar = Context.Variables[(IElementNode)parentNode];
if ((contentProperty = GetContentProperty(parentVar.VariableType)) != null)
propertyName = new XmlName(((IElementNode)parentNode).NamespaceURI, contentProperty);
else
return;
}
if (TrySetRuntimeName(propertyName, Context.Variables[(IElementNode)parentNode], node))
return;
if (skips.Contains(propertyName))
return;
if (parentNode is IElementNode && ((IElementNode)parentNode).SkipProperties.Contains (propertyName))
return;
if (propertyName.Equals(XamlParser.McUri, "Ignorable"))
return;
Context.IL.Append(SetPropertyValue(Context.Variables [(IElementNode)parentNode], propertyName, node, Context, node));
}
public void Visit(MarkupNode node, INode parentNode)
{
}
public void Visit(ElementNode node, INode parentNode)
{
XmlName propertyName = XmlName.Empty;
//Simplify ListNodes with single elements
var pList = parentNode as ListNode;
if (pList != null && pList.CollectionItems.Count == 1) {
propertyName = pList.XmlName;
parentNode = parentNode.Parent;
}
if ((propertyName != XmlName.Empty || TryGetPropertyName(node, parentNode, out propertyName)) && skips.Contains(propertyName))
return;
if (propertyName == XmlName._CreateContent) {
SetDataTemplate((IElementNode)parentNode, node, Context, node);
return;
}
//if this node is an IMarkupExtension, invoke ProvideValue() and replace the variable
var vardef = Context.Variables[node];
var vardefref = new VariableDefinitionReference(vardef);
var localName = propertyName.LocalName;
TypeReference declaringTypeReference = null;
FieldReference bpRef = null;
var _ = false;
PropertyDefinition propertyRef = null;
if (parentNode is IElementNode && propertyName != XmlName.Empty) {
bpRef = GetBindablePropertyReference(Context.Variables [(IElementNode)parentNode], propertyName.NamespaceURI, ref localName, out _, Context, node);
propertyRef = Context.Variables [(IElementNode)parentNode].VariableType.GetProperty(pd => pd.Name == localName, out declaringTypeReference);
}
Context.IL.Append(ProvideValue(vardefref, Context, Module, node, bpRef:bpRef, propertyRef:propertyRef, propertyDeclaringTypeRef: declaringTypeReference));
if (vardef != vardefref.VariableDefinition)
{
vardef = vardefref.VariableDefinition;
Context.Body.Variables.Add(vardef);
Context.Variables[node] = vardef;
}
if (propertyName != XmlName.Empty) {
if (skips.Contains(propertyName))
return;
if (parentNode is IElementNode && ((IElementNode)parentNode).SkipProperties.Contains (propertyName))
return;
Context.IL.Append(SetPropertyValue(Context.Variables[(IElementNode)parentNode], propertyName, node, Context, node));
}
else if (IsCollectionItem(node, parentNode) && parentNode is IElementNode) {
var parentVar = Context.Variables[(IElementNode)parentNode];
string contentProperty;
if (CanAddToResourceDictionary(parentVar, parentVar.VariableType, node, node, Context)) {
Context.IL.Append(parentVar.LoadAs(Module.GetTypeDefinition(("Xamarin.Forms.Core", "Xamarin.Forms", "ResourceDictionary")), Module));
Context.IL.Append(AddToResourceDictionary(node, node, Context));
}
// Collection element, implicit content, or implicit collection element.
else if ( parentVar.VariableType.ImplementsInterface(Module.ImportReference(("mscorlib", "System.Collections", "IEnumerable")))
&& parentVar.VariableType.GetMethods(md => md.Name == "Add" && md.Parameters.Count == 1, Module).Any()) {
var elementType = parentVar.VariableType;
var adderTuple = elementType.GetMethods(md => md.Name == "Add" && md.Parameters.Count == 1, Module).First();
var adderRef = Module.ImportReference(adderTuple.Item1);
adderRef = Module.ImportReference(adderRef.ResolveGenericParameters(adderTuple.Item2, Module));
Context.IL.Emit(Ldloc, parentVar);
Context.IL.Append(vardef.LoadAs(adderRef.Parameters[0].ParameterType.ResolveGenericParameters(adderRef), Module));
Context.IL.Emit(Callvirt, adderRef);
if (adderRef.ReturnType.FullName != "System.Void")
Context.IL.Emit(Pop);
}
else if ((contentProperty = GetContentProperty(parentVar.VariableType)) != null) {
var name = new XmlName(node.NamespaceURI, contentProperty);
if (skips.Contains(name))
return;
if (parentNode is IElementNode && ((IElementNode)parentNode).SkipProperties.Contains (propertyName))
return;
Context.IL.Append(SetPropertyValue(Context.Variables[(IElementNode)parentNode], name, node, Context, node));
}
else
throw new XamlParseException($"Can not set the content of {((IElementNode)parentNode).XmlType.Name} as it doesn't have a ContentPropertyAttribute", node);
}
else if (IsCollectionItem(node, parentNode) && parentNode is ListNode)
{
// IL_000d: ldloc.2
// IL_000e: callvirt instance class [mscorlib]System.Collections.Generic.IList`1<!0> class [Xamarin.Forms.Core]Xamarin.Forms.Layout`1<class [Xamarin.Forms.Core]Xamarin.Forms.View>::get_Children()
// IL_0013: ldloc.0
// IL_0014: callvirt instance void class [mscorlib]System.Collections.Generic.ICollection`1<class [Xamarin.Forms.Core]Xamarin.Forms.View>::Add(!0)
var parentList = (ListNode)parentNode;
var parent = Context.Variables[((IElementNode)parentNode.Parent)];
if (skips.Contains(parentList.XmlName))
return;
if (parentNode is IElementNode && ((IElementNode)parentNode).SkipProperties.Contains (propertyName))
return;
var elementType = parent.VariableType;
var localname = parentList.XmlName.LocalName;
TypeReference propertyType;
Context.IL.Append(GetPropertyValue(parent, parentList.XmlName, Context, node, out propertyType));
if (CanAddToResourceDictionary(parent, propertyType, node, node, Context)) {
Context.IL.Append(AddToResourceDictionary(node, node, Context));
return;
}
var adderTuple = propertyType.GetMethods(md => md.Name == "Add" && md.Parameters.Count == 1, Module).FirstOrDefault();
if (adderTuple == null)
throw new XamlParseException($"Can not Add() elements to {parent.VariableType}.{localname}", node);
var adderRef = Module.ImportReference(adderTuple.Item1);
adderRef = Module.ImportReference(adderRef.ResolveGenericParameters(adderTuple.Item2, Module));
Context.IL.Append(vardef.LoadAs(adderRef.Parameters[0].ParameterType.ResolveGenericParameters(adderRef), Module));
Context.IL.Emit(OpCodes.Callvirt, adderRef);
if (adderRef.ReturnType.FullName != "System.Void")
Context.IL.Emit(OpCodes.Pop);
}
}
public void Visit(RootNode node, INode parentNode)
{
}
public void Visit(ListNode node, INode parentNode)
{
}
public static bool TryGetPropertyName(INode node, INode parentNode, out XmlName name)
{
name = default(XmlName);
if (!(parentNode is IElementNode parentElement))
return false;
foreach (var kvp in parentElement.Properties)
{
if (kvp.Value != node)
continue;
name = kvp.Key;
return true;
}
return false;
}
static bool IsCollectionItem(INode node, INode parentNode)
{
if (!(parentNode is IListNode parentList))
return false;
return parentList.CollectionItems.Contains(node);
}
internal static string GetContentProperty(TypeReference typeRef)
{
var typeDef = typeRef.ResolveCached();
var attributes = typeDef.CustomAttributes;
var attr =
attributes.FirstOrDefault(cad => ContentPropertyAttribute.ContentPropertyTypes.Contains(cad.AttributeType.FullName));
if (attr != null)
return attr.ConstructorArguments[0].Value as string;
if (typeDef.BaseType == null)
return null;
return GetContentProperty(typeDef.BaseType);
}
public static IEnumerable<Instruction> ProvideValue(VariableDefinitionReference vardefref, ILContext context,
ModuleDefinition module, ElementNode node, FieldReference bpRef = null,
PropertyReference propertyRef = null, TypeReference propertyDeclaringTypeRef = null)
{
GenericInstanceType markupExtension;
IList<TypeReference> genericArguments;
if (vardefref.VariableDefinition.VariableType.FullName == "Xamarin.Forms.Xaml.ArrayExtension" &&
vardefref.VariableDefinition.VariableType.ImplementsGenericInterface("Xamarin.Forms.Xaml.IMarkupExtension`1",
out markupExtension, out genericArguments))
{
var markExt = markupExtension.ResolveCached();
var provideValueInfo = markExt.Methods.First(md => md.Name == "ProvideValue");
var provideValue = module.ImportReference(provideValueInfo);
provideValue =
module.ImportReference(provideValue.ResolveGenericParameters(markupExtension, module));
var typeNode = node.Properties[new XmlName("", "Type")];
TypeReference arrayTypeRef;
if (context.TypeExtensions.TryGetValue(typeNode, out arrayTypeRef))
vardefref.VariableDefinition = new VariableDefinition(module.ImportReference(arrayTypeRef.MakeArrayType()));
else
vardefref.VariableDefinition = new VariableDefinition(module.ImportReference(genericArguments.First()));
foreach (var instruction in context.Variables[node].LoadAs(markupExtension, module))
yield return instruction;
foreach (var instruction in node.PushServiceProvider(context, bpRef, propertyRef, propertyDeclaringTypeRef))
yield return instruction;
yield return Instruction.Create(OpCodes.Callvirt, provideValue);
if (arrayTypeRef != null)
yield return Instruction.Create(OpCodes.Castclass, module.ImportReference(arrayTypeRef.MakeArrayType()));
yield return Instruction.Create(OpCodes.Stloc, vardefref.VariableDefinition);
}
else if (vardefref.VariableDefinition.VariableType.ImplementsGenericInterface("Xamarin.Forms.Xaml.IMarkupExtension`1",
out markupExtension, out genericArguments))
{
var acceptEmptyServiceProvider = vardefref.VariableDefinition.VariableType.GetCustomAttribute(module, ("Xamarin.Forms.Core", "Xamarin.Forms.Xaml", "AcceptEmptyServiceProviderAttribute")) != null;
if ( vardefref.VariableDefinition.VariableType.FullName == "Xamarin.Forms.Xaml.BindingExtension"
&& (node.Properties == null || !node.Properties.ContainsKey(new XmlName("", "Source"))) //do not compile bindings if Source is set
&& bpRef != null //do not compile bindings if we're not gonna SetBinding
)
foreach (var instruction in CompileBindingPath(node, context, vardefref.VariableDefinition))
yield return instruction;
var markExt = markupExtension.ResolveCached();
var provideValueInfo = markExt.Methods.First(md => md.Name == "ProvideValue");
var provideValue = module.ImportReference(provideValueInfo);
provideValue =
module.ImportReference(provideValue.ResolveGenericParameters(markupExtension, module));
vardefref.VariableDefinition = new VariableDefinition(module.ImportReference(genericArguments.First()));
foreach (var instruction in context.Variables[node].LoadAs(markupExtension, module))
yield return instruction;
if (acceptEmptyServiceProvider)
yield return Instruction.Create(OpCodes.Ldnull);
else
foreach (var instruction in node.PushServiceProvider(context, bpRef, propertyRef, propertyDeclaringTypeRef))
yield return instruction;
yield return Instruction.Create(OpCodes.Callvirt, provideValue);
yield return Instruction.Create(OpCodes.Stloc, vardefref.VariableDefinition);
}
else if (context.Variables[node].VariableType.ImplementsInterface(module.ImportReference(("Xamarin.Forms.Core", "Xamarin.Forms.Xaml", "IMarkupExtension"))))
{
var acceptEmptyServiceProvider = context.Variables[node].VariableType.GetCustomAttribute(module, ("Xamarin.Forms.Core", "Xamarin.Forms.Xaml", "AcceptEmptyServiceProviderAttribute")) != null;
var markupExtensionType = ("Xamarin.Forms.Core", "Xamarin.Forms.Xaml", "IMarkupExtension");
vardefref.VariableDefinition = new VariableDefinition(module.TypeSystem.Object);
foreach (var instruction in context.Variables[node].LoadAs(module.GetTypeDefinition(markupExtensionType), module))
yield return instruction;
if (acceptEmptyServiceProvider)
yield return Create(Ldnull);
else
foreach (var instruction in node.PushServiceProvider(context, bpRef, propertyRef, propertyDeclaringTypeRef))
yield return instruction;
yield return Create(Callvirt, module.ImportMethodReference(markupExtensionType,
methodName: "ProvideValue",
parameterTypes: new[] { ("System.ComponentModel", "System", "IServiceProvider") }));
yield return Create(Stloc, vardefref.VariableDefinition);
}
else if (context.Variables[node].VariableType.ImplementsInterface(module.ImportReference(("Xamarin.Forms.Core", "Xamarin.Forms.Xaml", "IValueProvider"))))
{
var acceptEmptyServiceProvider = context.Variables[node].VariableType.GetCustomAttribute(module, ("Xamarin.Forms.Core", "Xamarin.Forms.Xaml", "AcceptEmptyServiceProviderAttribute")) != null;
var valueProviderType = context.Variables[node].VariableType;
//If the IValueProvider has a ProvideCompiledAttribute that can be resolved, shortcut this
var compiledValueProviderName = valueProviderType?.GetCustomAttribute(module, ("Xamarin.Forms.Core", "Xamarin.Forms.Xaml", "ProvideCompiledAttribute"))?.ConstructorArguments?[0].Value as string;
Type compiledValueProviderType;
if (compiledValueProviderName != null && (compiledValueProviderType = Type.GetType(compiledValueProviderName)) != null) {
var compiledValueProvider = Activator.CreateInstance(compiledValueProviderType);
var cProvideValue = typeof(ICompiledValueProvider).GetMethods().FirstOrDefault(md => md.Name == "ProvideValue");
var instructions = (IEnumerable<Instruction>)cProvideValue.Invoke(compiledValueProvider, new object[] {
vardefref,
context.Body.Method.Module,
node as BaseNode,
context});
foreach (var i in instructions)
yield return i;
yield break;
}
var valueProviderInterface = ("Xamarin.Forms.Core", "Xamarin.Forms.Xaml", "IValueProvider");
vardefref.VariableDefinition = new VariableDefinition(module.TypeSystem.Object);
foreach (var instruction in context.Variables[node].LoadAs(module.GetTypeDefinition(valueProviderInterface), module))
yield return instruction;
if (acceptEmptyServiceProvider)
yield return Create(Ldnull);
else
foreach (var instruction in node.PushServiceProvider(context, bpRef, propertyRef, propertyDeclaringTypeRef))
yield return instruction;
yield return Create(Callvirt, module.ImportMethodReference(valueProviderInterface,
methodName: "ProvideValue",
parameterTypes: new[] { ("System.ComponentModel", "System", "IServiceProvider") }));
yield return Create(Stloc, vardefref.VariableDefinition);
}
}
//Once we get compiled IValueProvider, this will move to the BindingExpression
static IEnumerable<Instruction> CompileBindingPath(ElementNode node, ILContext context, VariableDefinition bindingExt)
{
//TODO support casting operators
var module = context.Module;
if (!node.Properties.TryGetValue(new XmlName("", "Path"), out INode pathNode) && node.CollectionItems.Any())
pathNode = node.CollectionItems[0];
var path = (pathNode as ValueNode)?.Value as string;
if ( !node.Properties.TryGetValue(new XmlName("", "Mode"), out INode modeNode)
|| !Enum.TryParse((modeNode as ValueNode)?.Value as string, true, out BindingMode declaredmode))
declaredmode = BindingMode.TwoWay; //meaning the mode isn't specified in the Binding extension. generate getters, setters, handlers
INode dataTypeNode = null;
IElementNode n = node;
while (n != null) {
if (n.Properties.TryGetValue(XmlName.xDataType, out dataTypeNode))
break;
n = n.Parent as IElementNode;
}
if (dataTypeNode is null)
yield break;
if ( dataTypeNode is ElementNode enode
&& enode.XmlType.NamespaceUri == XamlParser.X2009Uri
&& enode.XmlType.Name == nameof(Xamarin.Forms.Xaml.NullExtension))
yield break;
string dataType = null;
if ( dataTypeNode is ElementNode elementNode
&& elementNode.XmlType.NamespaceUri == XamlParser.X2009Uri
&& elementNode.XmlType.Name == nameof(Xamarin.Forms.Xaml.TypeExtension)
&& elementNode.Properties.ContainsKey(new XmlName("", nameof(Xamarin.Forms.Xaml.TypeExtension.TypeName)))
&& (elementNode.Properties[new XmlName("", nameof(Xamarin.Forms.Xaml.TypeExtension.TypeName))] as ValueNode)?.Value is string stringtype)
dataType = stringtype;
if ((dataTypeNode as ValueNode)?.Value is string sType)
dataType = sType;
if (dataType is null)
throw new XamlParseException("x:DataType expects a string literal, an {x:Type} markup or {x:Null}", dataTypeNode as IXmlLineInfo);
var prefix = dataType.Contains(":") ? dataType.Substring(0, dataType.IndexOf(":", StringComparison.Ordinal)) : "";
var namespaceuri = node.NamespaceResolver.LookupNamespace(prefix) ?? "";
if (!string.IsNullOrEmpty(prefix) && string.IsNullOrEmpty(namespaceuri))
throw new XamlParseException($"Undeclared xmlns prefix '{prefix}'", dataTypeNode as IXmlLineInfo);
var dtXType = new XmlType(namespaceuri, dataType, null);
var tSourceRef = dtXType.GetTypeReference(module, (IXmlLineInfo)node);
if (tSourceRef == null)
yield break; //throw
var properties = ParsePath(path, tSourceRef, node as IXmlLineInfo, module);
TypeReference tPropertyRef = tSourceRef;
if (properties != null && properties.Count > 0) {
var lastProp = properties[properties.Count - 1];
tPropertyRef = lastProp.property.PropertyType.ResolveGenericParameters(lastProp.propDeclTypeRef);
}
tPropertyRef = module.ImportReference(tPropertyRef);
var valuetupleRef = context.Module.ImportReference(module.ImportReference(("mscorlib", "System", "ValueTuple`2")).MakeGenericInstanceType(new[] { tPropertyRef, module.TypeSystem.Boolean }));
var funcRef = module.ImportReference(module.ImportReference(("mscorlib", "System", "Func`2")).MakeGenericInstanceType(new [] { tSourceRef, valuetupleRef }));
var actionRef = module.ImportReference(module.ImportReference(("mscorlib", "System", "Action`2")).MakeGenericInstanceType(new [] { tSourceRef, tPropertyRef }));
var funcObjRef = module.ImportReference(module.ImportReference(("mscorlib", "System", "Func`2")).MakeGenericInstanceType(new [] { tSourceRef, module.TypeSystem.Object }));
var tupleRef = module.ImportReference(module.ImportReference(("mscorlib", "System", "Tuple`2")).MakeGenericInstanceType(new [] { funcObjRef, module.TypeSystem.String}));
var typedBindingRef = module.ImportReference(module.ImportReference(("Xamarin.Forms.Core", "Xamarin.Forms.Internals", "TypedBinding`2")).MakeGenericInstanceType(new [] { tSourceRef, tPropertyRef}));
//FIXME: make sure the non-deprecated one is used
var ctorInfo = module.ImportReference(typedBindingRef.ResolveCached().Methods.FirstOrDefault(md =>
md.IsConstructor
&& !md.IsStatic
&& md.Parameters.Count == 3
&& !md.HasCustomAttributes (module.ImportReference(("mscorlib", "System", "ObsoleteAttribute")))));
var ctorinforef = ctorInfo.MakeGeneric(typedBindingRef, funcRef, actionRef, tupleRef);
var bindingExtensionType = ("Xamarin.Forms.Xaml", "Xamarin.Forms.Xaml", "BindingExtension");
foreach (var instruction in bindingExt.LoadAs(module.GetTypeDefinition(bindingExtensionType), module))
yield return instruction;
foreach (var instruction in CompiledBindingGetGetter(tSourceRef, tPropertyRef, properties, node, context))
yield return instruction;
if (declaredmode != BindingMode.OneTime && declaredmode != BindingMode.OneWay) { //if the mode is explicitly 1w, or 1t, no need for setters
foreach (var instruction in CompiledBindingGetSetter(tSourceRef, tPropertyRef, properties, node, context))
yield return instruction;
} else
yield return Create(Ldnull);
if (declaredmode != BindingMode.OneTime) { //if the mode is explicitly 1t, no need for handlers
foreach (var instruction in CompiledBindingGetHandlers(tSourceRef, tPropertyRef, properties, node, context))
yield return instruction;
} else
yield return Create(Ldnull);
yield return Create(Newobj, module.ImportReference(ctorinforef));
yield return Create(Callvirt, module.ImportPropertySetterReference(bindingExtensionType, propertyName: "TypedBinding"));
}
static IList<(PropertyDefinition property, TypeReference propDeclTypeRef, string indexArg)> ParsePath(string path, TypeReference tSourceRef, IXmlLineInfo lineInfo, ModuleDefinition module)
{
if (string.IsNullOrWhiteSpace(path))
return null;
path = path.Trim(' ', '.'); //trim leading or trailing dots
var parts = path.Split(new [] { '.' }, StringSplitOptions.RemoveEmptyEntries);
var properties = new List<(PropertyDefinition property, TypeReference propDeclTypeRef, string indexArg)>();
var previousPartTypeRef = tSourceRef;
foreach (var part in parts) {
var p = part;
string indexArg = null;
var lbIndex = p.IndexOf('[');
if (lbIndex != -1) {
var rbIndex = p.LastIndexOf(']');
if (rbIndex == -1)
throw new XamlParseException("Binding: Indexer did not contain closing bracket", lineInfo);
var argLength = rbIndex - lbIndex - 1;
if (argLength == 0)
throw new XamlParseException("Binding: Indexer did not contain arguments", lineInfo);
indexArg = p.Substring(lbIndex + 1, argLength).Trim();
if (indexArg.Length == 0)
throw new XamlParseException("Binding: Indexer did not contain arguments", lineInfo);
p = p.Substring(0, lbIndex);
p = p.Trim();
}
if (p.Length > 0) {
var property = previousPartTypeRef.GetProperty(pd => pd.Name == p && pd.GetMethod != null && pd.GetMethod.IsPublic, out var propDeclTypeRef)
?? throw new XamlParseException($"Binding: Property '{p}' not found on '{previousPartTypeRef}'", lineInfo);
properties.Add((property, propDeclTypeRef, null));
previousPartTypeRef = property.PropertyType.ResolveGenericParameters(propDeclTypeRef);
}
if (indexArg != null) {
var defaultMemberAttribute = previousPartTypeRef.GetCustomAttribute(module, ("mscorlib", "System.Reflection", "DefaultMemberAttribute"));
var indexerName = defaultMemberAttribute?.ConstructorArguments?.FirstOrDefault().Value as string ?? "Item";
PropertyDefinition indexer = null;
TypeReference indexerDeclTypeRef = null;
if (int.TryParse(indexArg, out _))
indexer = previousPartTypeRef.GetProperty(pd => pd.Name == indexerName
&& pd.GetMethod != null
&& TypeRefComparer.Default.Equals(pd.GetMethod.Parameters[0].ParameterType.ResolveGenericParameters(previousPartTypeRef), module.ImportReference(("mscorlib", "System", "Int32")))
&& pd.GetMethod.IsPublic, out indexerDeclTypeRef);
indexer = indexer ?? previousPartTypeRef.GetProperty(pd => pd.Name == indexerName
&& pd.GetMethod != null
&& TypeRefComparer.Default.Equals(pd.GetMethod.Parameters[0].ParameterType.ResolveGenericParameters(previousPartTypeRef), module.ImportReference(("mscorlib", "System", "String")))
&& pd.GetMethod.IsPublic, out indexerDeclTypeRef);
indexer = indexer ?? previousPartTypeRef.GetProperty(pd => pd.Name == indexerName
&& pd.GetMethod != null
&& TypeRefComparer.Default.Equals(pd.GetMethod.Parameters[0].ParameterType.ResolveGenericParameters(previousPartTypeRef), module.ImportReference(("mscorlib", "System", "Object")))
&& pd.GetMethod.IsPublic, out indexerDeclTypeRef);
properties.Add((indexer, indexerDeclTypeRef, indexArg));
var indexType = indexer.GetMethod.Parameters[0].ParameterType.ResolveGenericParameters(indexerDeclTypeRef);
if (!TypeRefComparer.Default.Equals(indexType, module.TypeSystem.String) && !TypeRefComparer.Default.Equals(indexType, module.TypeSystem.Int32))
throw new XamlParseException($"Binding: Unsupported indexer index type: {indexType.FullName}", lineInfo);
previousPartTypeRef = indexer.PropertyType.ResolveGenericParameters(indexerDeclTypeRef);
}
}
return properties;
}
static IEnumerable<Instruction> DigProperties(IEnumerable<(PropertyDefinition property, TypeReference propDeclTypeRef, string indexArg)> properties, Dictionary<TypeReference, VariableDefinition> locs, Func<Instruction> fallback, IXmlLineInfo lineInfo, ModuleDefinition module)
{
var first = true;
foreach (var (property, propDeclTypeRef, indexArg) in properties) {
if (!first && propDeclTypeRef.IsValueType) {
var importedPropDeclTypeRef = module.ImportReference(propDeclTypeRef);
if (!locs.TryGetValue(importedPropDeclTypeRef, out var loc)) {
loc = new VariableDefinition(importedPropDeclTypeRef);
locs[importedPropDeclTypeRef] = loc;
}
yield return Create(Stloc, loc);
yield return Create(Ldloca, loc);
}
if (fallback != null && !propDeclTypeRef.IsValueType) {
yield return Create(Dup);
yield return Create(Brfalse, fallback());
}
if (indexArg != null) {
var indexType = property.GetMethod.Parameters[0].ParameterType.ResolveGenericParameters(propDeclTypeRef);
if (TypeRefComparer.Default.Equals(indexType, module.TypeSystem.String))
yield return Create(Ldstr, indexArg);
else if (TypeRefComparer.Default.Equals(indexType, module.TypeSystem.Int32) && int.TryParse(indexArg, out int index))
yield return Create(Ldc_I4, index);
else
throw new XamlParseException($"Binding: {indexArg} could not be parsed as an index for a {property.Name}", lineInfo);
}
var getMethod = module.ImportReference((module.ImportReference(property.GetMethod)).ResolveGenericParameters(propDeclTypeRef, module));
if (property.GetMethod.IsVirtual)
yield return Create(Callvirt, getMethod);
else
yield return Create(Call, getMethod);
first = false;
}
}
static IEnumerable<Instruction> CompiledBindingGetGetter(TypeReference tSourceRef, TypeReference tPropertyRef, IList<(PropertyDefinition property, TypeReference propDeclTypeRef, string indexArg)> properties, ElementNode node, ILContext context)
{
// .method private static hidebysig default valuetype[mscorlib] System.ValueTuple`2<string, bool> '<Main>m__0' (class ViewModel A_0) cil managed
// {
// .custom instance void class [mscorlib] System.Runtime.CompilerServices.CompilerGeneratedAttribute::'.ctor'() = (01 00 00 00 ) // ....
// IL_0000: ldarg.0
// IL_0001: dup
// IL_0002: ldnull
// IL_0003: ceq
// IL_0005: brfalse IL_0013
// IL_000a: pop
// IL_000b: ldnull
// IL_000c: ldc.i4.0
// IL_000d: newobj instance void valuetype[mscorlib]System.ValueTuple`2<string, bool>::'.ctor'(!0, !1)
// IL_0012: ret
// IL_0013: nop
// IL_0014: call instance string class ViewModel::get_Text()
// IL_0019: ldc.i4.1
// IL_001a: newobj instance void valuetype[mscorlib]System.ValueTuple`2<string, bool>::'.ctor'(!0, !1)
// IL_001f: ret
// }
var module = context.Module;
var tupleRef = module.ImportReference(module.ImportReference(("mscorlib", "System", "ValueTuple`2")).MakeGenericInstanceType(new[] { tPropertyRef, module.TypeSystem.Boolean }));
var tupleCtorRef = module.ImportCtorReference(tupleRef, 2);
tupleCtorRef = module.ImportReference(tupleCtorRef.ResolveGenericParameters(tupleRef, module));
var getter = new MethodDefinition($"<{context.Body.Method.Name}>typedBindingsM__{typedBindingCount++}",
MethodAttributes.Private | MethodAttributes.HideBySig | MethodAttributes.Static,
tupleRef) {
Parameters = { new ParameterDefinition(tSourceRef) },
CustomAttributes = { new CustomAttribute (module.ImportCtorReference(("mscorlib", "System.Runtime.CompilerServices", "CompilerGeneratedAttribute"), parameterTypes: null)) }
};
getter.Body.InitLocals = true;
var il = getter.Body.GetILProcessor();
if (properties == null || properties.Count == 0) { //return self
il.Emit(Ldarg_0);
il.Emit(Ldc_I4_1); //true
il.Emit(Newobj, tupleCtorRef);
il.Emit(Ret);
}
else {
var locs = new Dictionary<TypeReference, VariableDefinition>();
if (tSourceRef.IsValueType)
il.Emit(Ldarga_S, (byte)0);
else
il.Emit(Ldarg_0);
Instruction pop = null;
il.Append(DigProperties(properties, locs, () => {
if (pop == null)
pop = Create(Pop);
return pop;
}, node as IXmlLineInfo, module));
foreach (var loc in locs.Values)
getter.Body.Variables.Add(loc);
il.Emit(Ldc_I4_1); //true
il.Emit(Newobj, tupleCtorRef);
il.Emit(Ret);
if (pop != null) {
if (!locs.TryGetValue(tupleRef, out var defaultValueVarDef)) {
defaultValueVarDef = new VariableDefinition(tupleRef);
getter.Body.Variables.Add(defaultValueVarDef);
}
il.Append(pop);
il.Emit(Ldloca_S, defaultValueVarDef);
il.Emit(Initobj, tupleRef);
il.Emit(Ldloc, defaultValueVarDef);
il.Emit(Ret);
}
}
context.Body.Method.DeclaringType.Methods.Add(getter);
// IL_02fa: ldnull
// IL_02fb: ldftn valuetype[mscorlib]System.ValueTuple`2 <string,bool> class Test::'<Main>m__0'(class ViewModel)
// IL_0301: newobj instance void class [mscorlib] System.Func`2<class ViewModel, valuetype[mscorlib] System.ValueTuple`2<string, bool>>::'.ctor'(object, native int)
yield return Create(Ldnull);
yield return Create(Ldftn, getter);
yield return Create(Newobj, module.ImportCtorReference(("mscorlib", "System", "Func`2"), paramCount: 2, classArguments: new[] { tSourceRef, tupleRef }));
}
static IEnumerable<Instruction> CompiledBindingGetSetter(TypeReference tSourceRef, TypeReference tPropertyRef, IList<(PropertyDefinition property, TypeReference propDeclTypeRef, string indexArg)> properties, ElementNode node, ILContext context)
{
if (properties == null || properties.Count == 0) {
yield return Create(Ldnull);
yield break;
}
// .method private static hidebysig default void '<Main>m__1' (class ViewModel vm, string s) cil managed
// {
// .custom instance void class [mscorlib]System.Runtime.CompilerServices.CompilerGeneratedAttribute::'.ctor'() = (01 00 00 00 ) // ....
//
// IL_0000: ldarg.0
// IL_0001: callvirt instance class ViewModel class ViewModel::get_Model()
// IL_0006: ldarg.1
// IL_0007: callvirt instance void class ViewModel::set_Text(string)
// IL_000c: ret
// }
var module = context.Module;
var setter = new MethodDefinition($"<{context.Body.Method.Name}>typedBindingsM__{typedBindingCount++}",
MethodAttributes.Private | MethodAttributes.HideBySig | MethodAttributes.Static,
module.TypeSystem.Void) {
Parameters = {
new ParameterDefinition(tSourceRef),
new ParameterDefinition(tPropertyRef)
},
CustomAttributes = {
new CustomAttribute (module.ImportCtorReference(("mscorlib", "System.Runtime.CompilerServices", "CompilerGeneratedAttribute"), parameterTypes: null))
}
};
setter.Body.InitLocals = true;
var il = setter.Body.GetILProcessor();
if (!properties.Any() || properties.Last().property.SetMethod == null) {
yield return Create(Ldnull); //throw or not ?
yield break;
}
var setterRef = module.ImportReference(properties.Last().property.SetMethod);
setterRef = module.ImportReference(setterRef.ResolveGenericParameters(properties.Last().propDeclTypeRef, module));
if (tSourceRef.IsValueType)
il.Emit(Ldarga_S, (byte)0);
else
il.Emit(Ldarg_0);
var locs = new Dictionary<TypeReference, VariableDefinition>();
Instruction pop = null;
il.Append(DigProperties(properties.Take(properties.Count - 1), locs, () => {
if (pop == null)
pop = Instruction.Create(Pop);
return pop;
}, node as IXmlLineInfo, module));
foreach (var loc in locs.Values)
setter.Body.Variables.Add(loc);
(PropertyDefinition lastProperty, TypeReference lastPropDeclTypeRef, string lastIndexArg) = properties.Last();
if (lastPropDeclTypeRef.IsValueType) {
var importedPropDeclTypeRef = module.ImportReference(lastPropDeclTypeRef);
if (!locs.TryGetValue(importedPropDeclTypeRef, out var loc)) {
loc = new VariableDefinition(importedPropDeclTypeRef);
setter.Body.Variables.Add(loc);
}
il.Emit(Stloc, loc);
il.Emit(Ldloca, loc);
} else {
if (pop == null)
pop = Instruction.Create(Pop);
il.Emit(Dup);
il.Emit(Brfalse, pop);
}
if (lastIndexArg != null) {
var indexType = lastProperty.GetMethod.Parameters[0].ParameterType.ResolveGenericParameters(lastPropDeclTypeRef);
if (TypeRefComparer.Default.Equals(indexType, module.TypeSystem.String))
il.Emit(Ldstr, lastIndexArg);
else if (TypeRefComparer.Default.Equals(indexType, module.TypeSystem.Int32)) {
if (!int.TryParse(lastIndexArg, out int index))
throw new XamlParseException($"Binding: {lastIndexArg} could not be parsed as an index for a {lastProperty.Name}", node as IXmlLineInfo);
il.Emit(Ldc_I4, index);
}
}
il.Emit(Ldarg_1);
if (properties.Last().property.SetMethod.IsVirtual)
il.Emit(Callvirt, setterRef);
else
il.Emit(Call, setterRef);
il.Emit(Ret);
if (pop != null) {
il.Append(pop);
il.Emit(Ret);
}
context.Body.Method.DeclaringType.Methods.Add(setter);
// IL_0024: ldnull
// IL_0025: ldftn void class Test::'<Main>m__1'(class ViewModel, string)
// IL_002b: newobj instance void class [mscorlib]System.Action`2<class ViewModel, string>::'.ctor'(object, native int)
yield return Create(Ldnull);
yield return Create(Ldftn, setter);
yield return Create(Newobj, module.ImportCtorReference(("mscorlib", "System", "Action`2"),
paramCount: 2,
classArguments:
new[] { tSourceRef, tPropertyRef }));
}
static IEnumerable<Instruction> CompiledBindingGetHandlers(TypeReference tSourceRef, TypeReference tPropertyRef, IList<(PropertyDefinition property, TypeReference propDeclTypeRef, string indexArg)> properties, ElementNode node, ILContext context)
{
// .method private static hidebysig default object '<Main>m__2'(class ViewModel vm) cil managed {
// .custom instance void class [mscorlib] System.Runtime.CompilerServices.CompilerGeneratedAttribute::'.ctor'() = (01 00 00 00 ) // ....
// IL_0000: ldarg.0
// IL_0001: ret
// } // end of method Test::<Main>m__2
// .method private static hidebysig default object '<Main>m__3' (class ViewModel vm) cil managed {
// .custom instance void class [mscorlib] System.Runtime.CompilerServices.CompilerGeneratedAttribute::'.ctor'() = (01 00 00 00 ) // ....
// IL_0000: ldarg.0
// IL_0001: callvirt instance class ViewModel class ViewModel::get_Model()
// IL_0006: ret
// }
var module = context.Module;
var partGetters = new List<MethodDefinition>();
if (properties == null || properties.Count == 0) {
yield return Create(Ldnull);
yield break;
}
for (int i = 0; i < properties.Count; i++) {
var tuple = properties [i];
var partGetter = new MethodDefinition($"<{context.Body.Method.Name}>typedBindingsM__{typedBindingCount++}", MethodAttributes.Private | MethodAttributes.HideBySig | MethodAttributes.Static, module.TypeSystem.Object) {
Parameters = {
new ParameterDefinition(tSourceRef)
},
CustomAttributes = {
new CustomAttribute (module.ImportCtorReference(("mscorlib", "System.Runtime.CompilerServices", "CompilerGeneratedAttribute"), parameterTypes: null))
}
};
partGetter.Body.InitLocals = true;
var il = partGetter.Body.GetILProcessor();
if (i == 0) { //return self
il.Emit(Ldarg_0);
if (tSourceRef.IsValueType)
il.Emit(Box, module.ImportReference(tSourceRef));
il.Emit(Ret);
context.Body.Method.DeclaringType.Methods.Add(partGetter);
partGetters.Add(partGetter);
continue;
}
if (tSourceRef.IsValueType)
il.Emit(Ldarga_S, (byte)0);
else
il.Emit(Ldarg_0);
var lastGetterTypeRef = properties[i - 1].property.PropertyType;
var locs = new Dictionary<TypeReference, VariableDefinition>();
il.Append(DigProperties(properties.Take(i), locs, null, node as IXmlLineInfo, module));
foreach (var loc in locs.Values)
partGetter.Body.Variables.Add(loc);
if (lastGetterTypeRef.IsValueType)
il.Emit(Box, module.ImportReference(lastGetterTypeRef));
il.Emit(Ret);
context.Body.Method.DeclaringType.Methods.Add(partGetter);
partGetters.Add(partGetter);
}
var funcObjRef = context.Module.ImportReference(module.ImportReference(("mscorlib", "System", "Func`2")).MakeGenericInstanceType(new [] { tSourceRef, module.TypeSystem.Object }));
var tupleRef = context.Module.ImportReference(module.ImportReference(("mscorlib", "System", "Tuple`2")).MakeGenericInstanceType(new [] { funcObjRef, module.TypeSystem.String }));
var funcCtor = module.ImportReference(funcObjRef.ResolveCached().GetConstructors().First());
funcCtor = funcCtor.MakeGeneric(funcObjRef, new [] { tSourceRef, module.TypeSystem.Object });
var tupleCtor = module.ImportReference(tupleRef.ResolveCached().GetConstructors().First());
tupleCtor = tupleCtor.MakeGeneric(tupleRef, new [] { funcObjRef, module.TypeSystem.String});
// IL_003a: ldc.i4.2
// IL_003b: newarr class [mscorlib] System.Tuple`2<class [mscorlib]System.Func`2<class ViewModel,object>,string>
// IL_0040: dup
// IL_0041: ldc.i4.0
// IL_0049: ldnull
// IL_004a: ldftn object class Test::'<Main>m__2'(class ViewModel)
// IL_0050: newobj instance void class [mscorlib]System.Func`2<class ViewModel, object>::'.ctor'(object, native int)
// IL_005f: ldstr "Model"
// IL_0064: newobj instance void class [mscorlib]System.Tuple`2<class [mscorlib]System.Func`2<class ViewModel, object>, string>::'.ctor'(!0, !1)
// IL_0069: stelem.ref
// IL_006a: dup
// IL_006b: ldc.i4.1
// IL_0073: ldnull
// IL_0074: ldftn object class Test::'<Main>m__3'(class ViewModel)
// IL_007a: newobj instance void class [mscorlib]System.Func`2<class ViewModel, object>::'.ctor'(object, native int)
// IL_0089: ldstr "Text"
// IL_008e: newobj instance void class [mscorlib]System.Tuple`2<class [mscorlib]System.Func`2<class ViewModel, object>, string>::'.ctor'(!0, !1)
// IL_0093: stelem.ref
yield return Instruction.Create(OpCodes.Ldc_I4, properties.Count);
yield return Instruction.Create(OpCodes.Newarr, tupleRef);
for (var i = 0; i < properties.Count; i++) {
yield return Instruction.Create(OpCodes.Dup);
yield return Instruction.Create(OpCodes.Ldc_I4, i);
yield return Instruction.Create(OpCodes.Ldnull);
yield return Instruction.Create(OpCodes.Ldftn, partGetters [i]);
yield return Instruction.Create(OpCodes.Newobj, module.ImportReference(funcCtor));
yield return Instruction.Create(OpCodes.Ldstr, properties [i].Item1.Name);
yield return Instruction.Create(OpCodes.Newobj, module.ImportReference(tupleCtor));
yield return Instruction.Create(OpCodes.Stelem_Ref);
}
}
public static IEnumerable<Instruction> SetPropertyValue(VariableDefinition parent, XmlName propertyName, INode valueNode, ILContext context, IXmlLineInfo iXmlLineInfo)
{
var localName = propertyName.LocalName;
var bpRef = GetBindablePropertyReference(parent, propertyName.NamespaceURI, ref localName, out System.Boolean attached, context, iXmlLineInfo);
//If the target is an event, connect
if (CanConnectEvent(parent, localName, valueNode, attached))
return ConnectEvent(parent, localName, valueNode, iXmlLineInfo, context);
//If Value is DynamicResource, SetDynamicResource
if (CanSetDynamicResource(bpRef, valueNode, context))
return SetDynamicResource(parent, bpRef, valueNode as IElementNode, iXmlLineInfo, context);
//If Value is a BindingBase and target is a BP, SetBinding
if (CanSetBinding(bpRef, valueNode, context))
return SetBinding(parent, bpRef, valueNode as IElementNode, iXmlLineInfo, context);
//If it's a BP, SetValue ()
if (CanSetValue(bpRef, attached, valueNode, iXmlLineInfo, context))
return SetValue(parent, bpRef, valueNode, iXmlLineInfo, context);
//If it's a property, set it
if (CanSet(parent, localName, valueNode, context))
return Set(parent, localName, valueNode, iXmlLineInfo, context);
//If it's an already initialized property, add to it
if (CanAdd(parent, propertyName, valueNode, iXmlLineInfo, context))
return Add(parent, propertyName, valueNode, iXmlLineInfo, context);
throw new XamlParseException($"No property, bindable property, or event found for '{localName}', or mismatching type between value and property.", iXmlLineInfo);
}
public static IEnumerable<Instruction> GetPropertyValue(VariableDefinition parent, XmlName propertyName, ILContext context, IXmlLineInfo lineInfo, out TypeReference propertyType)
{
var module = context.Body.Method.Module;
var localName = propertyName.LocalName;
bool attached;
var bpRef = GetBindablePropertyReference(parent, propertyName.NamespaceURI, ref localName, out attached, context, lineInfo);
//If it's a BP, GetValue ()
if (CanGetValue(parent, bpRef, attached, lineInfo, context, out _))
return GetValue(parent, bpRef, lineInfo, context, out propertyType);
//If it's a property, set it
if (CanGet(parent, localName, context, out _))
return Get(parent, localName, lineInfo, context, out propertyType);
throw new XamlParseException($"Property {localName} is not found or does not have an accessible getter", lineInfo);
}
static FieldReference GetBindablePropertyReference(VariableDefinition parent, string namespaceURI, ref string localName, out bool attached, ILContext context, IXmlLineInfo iXmlLineInfo)
{
var module = context.Body.Method.Module;
TypeReference declaringTypeReference;
//If it's an attached BP, update elementType and propertyName
var bpOwnerType = parent.VariableType;
attached = GetNameAndTypeRef(ref bpOwnerType, namespaceURI, ref localName, context, iXmlLineInfo);
var name = $"{localName}Property";
FieldReference bpRef = bpOwnerType.GetField(fd => fd.Name == name &&
fd.IsStatic &&
(fd.IsPublic || fd.IsAssembly), out declaringTypeReference);
if (bpRef != null) {
bpRef = module.ImportReference(bpRef.ResolveGenericParameters(declaringTypeReference));
bpRef.FieldType = module.ImportReference(bpRef.FieldType);
}
return bpRef;
}
static bool CanConnectEvent(VariableDefinition parent, string localName, INode valueNode, bool attached)
{
return !attached && valueNode is ValueNode && parent.VariableType.GetEvent(ed => ed.Name == localName, out _) != null;
}
static IEnumerable<Instruction> ConnectEvent(VariableDefinition parent, string localName, INode valueNode, IXmlLineInfo iXmlLineInfo, ILContext context)
{
var elementType = parent.VariableType;
var module = context.Body.Method.Module;
TypeReference eventDeclaringTypeRef;
var eventinfo = elementType.GetEvent(ed => ed.Name == localName, out eventDeclaringTypeRef);
var adder = module.ImportReference(eventinfo.AddMethod);
adder = adder.ResolveGenericParameters(eventDeclaringTypeRef, module);
// IL_0007: ldloc.0
// IL_0008: ldarg.0
//
// IL_0009: ldftn instance void class Xamarin.Forms.Xaml.XamlcTests.MyPage::OnButtonClicked(object, class [mscorlib]System.EventArgs)
//OR, if the handler is virtual
// IL_000x: ldarg.0
// IL_0009: ldvirtftn instance void class Xamarin.Forms.Xaml.XamlcTests.MyPage::OnButtonClicked(object, class [mscorlib]System.EventArgs)
//
// IL_000f: newobj instance void class [mscorlib]System.EventHandler::'.ctor'(object, native int)
// IL_0014: callvirt instance void class [Xamarin.Forms.Core]Xamarin.Forms.Button::add_Clicked(class [mscorlib]System.EventHandler)
var value = ((ValueNode)valueNode).Value;
yield return Create(Ldloc, parent);
var declaringType = context.Body.Method.DeclaringType;
while (declaringType.IsNested)
declaringType = declaringType.DeclaringType;
var handler = declaringType.AllMethods().FirstOrDefault(md => {
if (md.methodDef.Name != value as string)
return false;
//check if the handler signature matches the Invoke signature;
var invoke = module.ImportReference(eventinfo.EventType.ResolveCached().GetMethods().First(eventmd => eventmd.Name == "Invoke"));
invoke = invoke.ResolveGenericParameters(eventinfo.EventType, module);
if (!md.methodDef.ReturnType.InheritsFromOrImplements(invoke.ReturnType) || invoke.Parameters.Count != md.methodDef.Parameters.Count)
return false;
if (!invoke.ContainsGenericParameter)
for (var i = 0; i < invoke.Parameters.Count;i++)
if (!invoke.Parameters[i].ParameterType.InheritsFromOrImplements(md.methodDef.Parameters[i].ParameterType))
return false;
//TODO check generic parameters if any
return true;
});
MethodReference handlerRef = null;
if (handler.methodDef != null)
handlerRef = handler.methodDef.ResolveGenericParameters(handler.declTypeRef, module);
if (handler.methodDef == null)
throw new XamlParseException($"EventHandler \"{value}\" with correct signature not found in type \"{declaringType}\"", iXmlLineInfo);
//FIXME: eventually get the right ctor instead fo the First() one, just in case another one could exists (not even sure it's possible).