/// <summary>
/// Creates Func<object, T> depending on the access.
/// </summary>
Delegate CompileAccess(AccessMask access)
{
var pinstance = Expression.Parameter(typeof(object));
var expr = Bind(null, Expression.Convert(pinstance, _field.DeclaringType));
if (access == AccessMask.Read)
{
expr = ConvertExpression.BindToValue(expr);
}
else
{
expr = BinderHelpers.BindAccess(expr, null, access, null);
}
return(Expression.Lambda(expr, true, pinstance).Compile());
}
Delegate CompileAccess(AccessMask access)
{
var pctx = Expression.Parameter(typeof(Context));
var pinstance = Expression.Parameter(typeof(object));
var expr = Bind(pctx, Expression.Convert(pinstance, Field.DeclaringType));
if (access == AccessMask.Read)
{
expr = ConvertExpression.BindToValue(expr);
}
else
{
expr = BinderHelpers.BindAccess(expr, null, access, null);
}
//
return(Expression.Lambda(expr, tailCall: true, parameters: new[] { pctx, pinstance }).Compile());
}
public ClrFieldProperty(PhpTypeInfo tinfo, FieldInfo field)
: base(tinfo)
{
_field = field ?? throw new ArgumentNullException(nameof(field));
//
_lazyGetter = new Lazy <Func <object, PhpValue> >(() => (Func <object, PhpValue>)CompileAccess(AccessMask.Read));
_lazyEnsureAlias = new Lazy <Func <object, PhpAlias> >(() => (Func <object, PhpAlias>)CompileAccess(AccessMask.ReadRef));
_lazyEnsureObject = new Lazy <Func <object, object> >(() => (Func <object, object>)CompileAccess(AccessMask.EnsureObject));
_lazyEnsureArray = new Lazy <Func <object, IPhpArray> >(() => (Func <object, IPhpArray>)CompileAccess(AccessMask.EnsureArray));
// SetValue(instance, PhpValue): void
_lazySetValue = new Lazy <Action <Context, object, PhpValue> >(() =>
{
if (IsReadOnly)
{
// error
return(new Action <Context, object, PhpValue>((_, _instance, _value) =>
{
PhpException.ErrorException(Resources.ErrResources.readonly_property_written, ContainingType.Name, PropertyName);
}));
}
var pctx = Expression.Parameter(typeof(Context));
var pinstance = Expression.Parameter(typeof(object));
var pvalue = Expression.Parameter(typeof(PhpValue));
// expr: <instance>.<field>
var expr = Bind(pctx, Expression.Convert(pinstance, _field.DeclaringType));
// expr: <field> := <value>
expr = BinderHelpers.BindAccess(expr, pctx, AccessMask.Write, pvalue);
//
var lambda = Expression.Lambda(Expression.Block(expr, Expression.Empty()), pctx, pinstance, pvalue);
return((Action <Context, object, PhpValue>)lambda.Compile());
});
}