public static bool TryBind(SyntaxTreeNode node, BindingContext bindingContext, TypeDescription expectedType, out Expression boundExpression, out Exception bindingError)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (bindingContext == null)
{
throw new ArgumentNullException("bindingContext");
}
if (expectedType == null)
{
throw new ArgumentNullException("expectedType");
}
boundExpression = null;
bindingError = null;
var target = default(Expression);
var targetNode = node.GetExpression(throwOnError: false);
var memberNode = node.GetMember(throwOnError: false);
var member = default(MemberDescription);
if (memberNode != null && bindingContext.TryResolveMember(memberNode, out member))
{
if (targetNode != null && AnyBinder.TryBind(targetNode, bindingContext, TypeDescription.ObjectType, out target, out bindingError) == false)
{
return(false);
}
boundExpression = Expression.MakeMemberAccess(target, member);
return(true);
}
var isStatic = false;
var targetType = default(Type);
var propertyOrFieldName = node.GetMemberName(throwOnError: true);
var useNullPropagation = node.GetUseNullPropagation(throwOnError: false);
if (bindingContext.TryResolveType(targetNode, out targetType))
{
target = null;
isStatic = true;
}
else if (targetNode == null)
{
target = bindingContext.Global;
targetType = target != null ? target.Type : null;
isStatic = false;
switch (propertyOrFieldName)
{
case Constants.VALUE_NULL_STRING:
boundExpression = ExpressionUtils.NullConstant;
return(true);
case Constants.VALUE_TRUE_STRING:
boundExpression = ExpressionUtils.TrueConstant;
return(true);
case Constants.VALUE_FALSE_STRING:
boundExpression = ExpressionUtils.TrueConstant;
return(false);
default:
if (bindingContext.TryGetParameter(propertyOrFieldName, out boundExpression))
{
return(true);
}
break;
}
}
else if (AnyBinder.TryBind(targetNode, bindingContext, TypeDescription.ObjectType, out target, out bindingError))
{
Debug.Assert(target != null, "target != null");
targetType = target.Type;
isStatic = false;
}
else
{
target = null;
targetType = null;
}
if (target == null && targetType == null)
{
if (bindingError == null)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETORESOLVENAME, propertyOrFieldName), node);
}
return(false);
}
Debug.Assert(targetType != null, "type != null");
var targetTypeDescription = TypeDescription.GetTypeDescription(targetType);
var foundMember = default(MemberDescription);
if (isStatic && targetTypeDescription.IsEnum)
{
var fieldMemberDescription = targetTypeDescription.GetMembers(propertyOrFieldName).FirstOrDefault(m => m.IsStatic);
if (fieldMemberDescription == null)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETORESOLVEMEMBERONTYPE, propertyOrFieldName, targetType), node);
return(false);
}
boundExpression = fieldMemberDescription.ConstantValueExpression;
}
else
{
foreach (var declaredMember in targetTypeDescription.GetMembers(propertyOrFieldName))
{
if (declaredMember.IsStatic != isStatic)
{
continue;
}
foundMember = foundMember ?? declaredMember;
if (declaredMember.IsPropertyOrField == false)
{
continue;
}
if (declaredMember.TryMakeAccessor(target, out boundExpression))
{
break;
}
}
}
if (boundExpression == null)
{
if (foundMember != null)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETOBINDMEMBER, propertyOrFieldName, targetType), node);
}
else
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETORESOLVEMEMBERONTYPE, propertyOrFieldName, targetType), node);
}
return(false);
}
if (useNullPropagation && isStatic)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETOAPPLYNULLCONDITIONALOPERATORONTYPEREF, targetType));
return(false);
}
if (useNullPropagation && targetTypeDescription.CanBeNull)
{
bindingContext.RegisterNullPropagationTarget(target);
}
if (targetTypeDescription.IsAssignableFrom(typeof(Type)) &&
bindingContext.IsKnownType(typeof(Type)) == false &&
bindingContext.IsKnownType(targetType) == false)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_RESTRICTED_MEMBER_INVOCATION, propertyOrFieldName, targetType, typeof(ITypeResolver)), node);
return(false);
}
return(true);
}
public static bool TryBind(SyntaxTreeNode node, BindingContext bindingContext, TypeDescription expectedType, out Expression boundExpression, out Exception bindingError)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (bindingContext == null)
{
throw new ArgumentNullException("bindingContext");
}
if (expectedType == null)
{
throw new ArgumentNullException("expectedType");
}
boundExpression = null;
bindingError = null;
var target = default(Expression);
var arguments = node.GetArguments(throwOnError: false);
var methodName = node.GetMethodName(throwOnError: true);
var useNullPropagation = node.GetUseNullPropagation(throwOnError: false);
var methodMember = default(MemberDescription);
if (bindingContext.TryResolveMember(methodName, out methodMember))
{
if (methodMember.IsMethod == false)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_CALLMEMBERISNOTMETHOD, methodMember.Name, methodMember.DeclaringType), node);
return(false);
}
var targetNode = node.GetExpression(throwOnError: true);
if (AnyBinder.TryBind(targetNode, bindingContext, TypeDescription.ObjectType, out target, out bindingError) == false)
{
return(false);
}
float methodQuality;
if (methodMember.TryMakeCall(target, arguments, bindingContext, out boundExpression, out methodQuality) == false)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETOBINDMETHOD, methodMember.Name, target.Type, arguments.Count), node);
return(false);
}
return(true);
}
var methodRef = default(TypeReference);
if (BindingContext.TryGetMethodReference(methodName, out methodRef) == false)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETORESOLVENAME, methodName), node);
return(false);
}
var targetType = default(Type);
if (TryBindTarget(node, bindingContext, out target, out targetType, out bindingError) == false)
{
return(false);
}
var isStatic = target == null;
var selectedMethodQuality = MemberDescription.QUALITY_INCOMPATIBLE;
var hasGenericParameters = methodRef.IsGenericType;
var genericArguments = default(Type[]);
if (hasGenericParameters)
{
genericArguments = new Type[methodRef.TypeArguments.Count];
for (var i = 0; i < genericArguments.Length; i++)
{
var typeArgument = methodRef.TypeArguments[i];
if (bindingContext.TryResolveType(typeArgument, out genericArguments[i]) == false)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETORESOLVETYPE, typeArgument), node);
return(false);
}
}
}
var targetTypeDescription = TypeDescription.GetTypeDescription(targetType);
var foundMethod = default(MethodInfo);
foreach (var memberDescription in targetTypeDescription.GetMembers(methodRef.Name))
{
if (memberDescription.IsMethod == false)
{
continue;
}
var methodDescription = memberDescription;
var method = (MethodInfo)memberDescription;
foundMethod = foundMethod ?? method;
if (method.IsStatic != isStatic || method.IsGenericMethod != hasGenericParameters)
{
continue;
}
if (hasGenericParameters && memberDescription.GenericArgumentsCount != methodRef.TypeArguments.Count)
{
continue;
}
if (hasGenericParameters)
{
try
{
methodDescription = methodDescription.MakeGenericMethod(genericArguments);
method = methodDescription;
}
catch (ArgumentException exception)
{
bindingError = exception;
continue; /* An element of typeArguments does not satisfy the constraints specified for the corresponding type parameter of the current generic method definition. */
}
}
var methodQuality = 0.0f;
var methodCallExpression = default(Expression);
if (methodDescription.TryMakeCall(target, arguments, bindingContext, out methodCallExpression, out methodQuality) == false)
{
continue;
}
if (float.IsNaN(methodQuality) || methodQuality <= selectedMethodQuality)
{
continue;
}
boundExpression = methodCallExpression;
selectedMethodQuality = methodQuality;
if (Math.Abs(methodQuality - MemberDescription.QUALITY_EXACT_MATCH) < float.Epsilon)
{
break; // best match
}
}
if (bindingError != null)
{
return(false);
}
if (boundExpression == null)
{
if (foundMethod != null)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETOBINDMETHOD, methodRef.Name, targetType, arguments.Count), node);
}
else
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETOBINDCALL, methodRef.Name, targetType, arguments.Count), node);
}
return(false);
}
if (useNullPropagation && target == null)
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_UNABLETOAPPLYNULLCONDITIONALOPERATORONTYPEREF, targetType));
return(false);
}
if (useNullPropagation && targetTypeDescription.CanBeNull)
{
bindingContext.RegisterNullPropagationTarget(target);
}
if (targetTypeDescription.IsAssignableFrom(typeof(Type)) &&
bindingContext.IsKnownType(typeof(Type)) == false &&
(bindingContext.IsKnownType(targetType) == false || methodRef.Name.Equals("InvokeMember", StringComparison.Ordinal)))
{
bindingError = new ExpressionParserException(string.Format(Properties.Resources.EXCEPTION_BIND_RESTRICTED_MEMBER_INVOCATION, methodName, targetType, typeof(ITypeResolver)), node);
return(false);
}
return(true);
}