/// <summary>
/// Gets a field from the target object.
/// </summary>
/// <remarks>Field names can be prefixed with @ to avoid clashes with C# keywords (e.g. var isChecked = input.@checked).</remarks>
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
try
{
result = target.get(binder.Name.TrimStart('@')).Result;
if (result is ExpandoObject) result = new Bridge(result);
return true;
}
catch (AggregateException e) { throw e.InnerException; }
}
/// <summary>
/// Evaluates JavaScript directly 'this' is bound to the target object.
/// </summary>
public dynamic @exec(string script)
{
try
{
var result = target.eval(script).Result;
if (result is ExpandoObject) result = new Bridge(result);
return result;
}
catch (AggregateException e) { throw e.InnerException; }
}
/// <summary>
/// Evaluates JavaScript directly within the context of the target object.
/// Particularly useful for expressing lambdas, but can be used to execute any JavaScript that cannot be expressed in C#.
/// </summary>
/// <example>
/// var visibleText = elements("filter(e => e.visible).map(e => e.textContent)");
/// </example>
public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
{
try
{
var script = "this." + args.Single().ToString();
result = target.eval(script).Result;
if (result is ExpandoObject) result = new Bridge(result);
return true;
}
catch (AggregateException e) { throw e.InnerException; }
}
/// <summary>
/// Gets the value at the specified index on the target object.
/// </summary>
public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
{
try
{
result = target.get(indexes.Single()).Result;
if (result is ExpandoObject) result = new Bridge(result);
return true;
}
catch (AggregateException e) { throw e.InnerException; }
}
/// <summary>
/// Invokes the function on the target object and returns the results.
/// </summary>
public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
{
try
{
result = target.call(new { key = binder.Name, args = args }).Result;
if (result is ExpandoObject) result = new Bridge(result);
return true;
}
catch (AggregateException e) { throw e.InnerException; }
}