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HostObject.cs
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97 lines (82 loc) · 2.49 KB
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#if !NETSTANDARD
using System;
using System.Globalization;
using System.Linq;
using System.Reflection;
using MsieJavaScriptEngine.Constants;
using MsieJavaScriptEngine.Helpers;
namespace MsieJavaScriptEngine
{
/// <summary>
/// Wrapper for object, that implements <see cref="IReflect"/> interface
/// </summary>
internal sealed class HostObject : HostItemBase
{
/// <summary>
/// Number of delegate parameters
/// </summary>
private int _delegateParameterCount = int.MinValue;
/// <summary>
/// Constructs an instance of the wrapper for object, that implements <see cref="IReflect"/> interface
/// </summary>
/// <param name="target">Target object</param>
/// <param name="engineMode">JS engine mode</param>
public HostObject(object target, JsEngineMode engineMode)
: base(target.GetType(), target, engineMode, true)
{
var del = _target as Delegate;
if (del != null)
{
_delegateParameterCount = del.Method.GetParameters().Length;
}
}
#region HostItemBase overrides
protected override object InnerInvokeMember(string name, BindingFlags invokeAttr, Binder binder, object target,
object[] args, ParameterModifier[] modifiers, CultureInfo culture, string[] namedParameters)
{
object result;
object processedTarget = TypeMappingHelpers.MapToHostType(target);
if (name == SpecialMemberName.Default && processedTarget is Delegate)
{
var del = (Delegate)processedTarget;
int argCount = args.Length;
int skippedArgCount = 0;
int parameterCount = _delegateParameterCount;
if (_engineMode == JsEngineMode.Classic && argCount > 0
&& (argCount - parameterCount) > 0)
{
skippedArgCount = 1;
}
int processedArgCount = argCount >= skippedArgCount ? argCount - skippedArgCount : 0;
if (processedArgCount > parameterCount)
{
processedArgCount = parameterCount;
}
object[] processedArgs;
if (processedArgCount > 0)
{
processedArgs = args
.Skip(skippedArgCount)
.Take(processedArgCount)
.Select(TypeMappingHelpers.MapToHostType)
.ToArray()
;
}
else
{
processedArgs = new object[0];
}
result = del.DynamicInvoke(processedArgs);
}
else
{
object[] processedArgs = TypeMappingHelpers.MapToHostType(args);
result = InvokeStandardMember(name, invokeAttr, binder, processedTarget,
processedArgs, modifiers, culture, namedParameters);
}
return TypeMappingHelpers.MapToScriptType(result, _engineMode);
}
#endregion
}
}
#endif