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public ToExpression ( ) : |
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| return | ||
public void AddRestriction(BindingRestrictions/*!*/ restriction) {
if (_treatRestrictionsAsConditions) {
AddCondition(restriction.ToExpression());
} else {
Add(restriction);
}
}
/// <summary>
/// Performs the runtime binding of the dynamic operation on a set of arguments.
/// </summary>
/// <param name="args">An array of arguments to the dynamic operation.</param>
/// <param name="parameters">The array of <see cref="ParameterExpression"/> instances that represent the parameters of the call site in the binding process.</param>
/// <param name="returnLabel">A LabelTarget used to return the result of the dynamic binding.</param>
/// <returns>
/// An Expression that performs tests on the dynamic operation arguments, and
/// performs the dynamic operation if the tests are valid. If the tests fail on
/// subsequent occurrences of the dynamic operation, Bind will be called again
/// to produce a new <see cref="Expression"/> for the new argument types.
/// </returns>
public sealed override Expression Bind(object[] args, ReadOnlyCollection <ParameterExpression> parameters, LabelTarget returnLabel)
{
ContractUtils.RequiresNotNull(args, nameof(args));
ContractUtils.RequiresNotNull(parameters, nameof(parameters));
ContractUtils.RequiresNotNull(returnLabel, nameof(returnLabel));
if (args.Length == 0)
{
throw System.Linq.Expressions.Error.OutOfRange("args.Length", 1);
}
if (parameters.Count == 0)
{
throw System.Linq.Expressions.Error.OutOfRange("parameters.Count", 1);
}
if (args.Length != parameters.Count)
{
throw new ArgumentOutOfRangeException(nameof(args));
}
// Ensure that the binder's ReturnType matches CallSite's return
// type. We do this so meta objects and language binders can
// compose trees together without needing to insert converts.
Type expectedResult;
if (IsStandardBinder)
{
expectedResult = ReturnType;
if (returnLabel.Type != typeof(void) &&
!TypeUtils.AreReferenceAssignable(returnLabel.Type, expectedResult))
{
throw System.Linq.Expressions.Error.BinderNotCompatibleWithCallSite(expectedResult, this, returnLabel.Type);
}
}
else
{
// Even for non-standard binders, we have to at least make sure
// it works with the CallSite's type to build the return.
expectedResult = returnLabel.Type;
}
DynamicMetaObject target = DynamicMetaObject.Create(args[0], parameters[0]);
DynamicMetaObject[] metaArgs = CreateArgumentMetaObjects(args, parameters);
DynamicMetaObject binding = Bind(target, metaArgs);
if (binding == null)
{
throw System.Linq.Expressions.Error.BindingCannotBeNull();
}
Expression body = binding.Expression;
BindingRestrictions restrictions = binding.Restrictions;
// Ensure the result matches the expected result type.
if (expectedResult != typeof(void) &&
!TypeUtils.AreReferenceAssignable(expectedResult, body.Type))
{
//
// Blame the last person that handled the result: assume it's
// the dynamic object (if any), otherwise blame the language.
//
if (target.Value is IDynamicMetaObjectProvider)
{
throw System.Linq.Expressions.Error.DynamicObjectResultNotAssignable(body.Type, target.Value.GetType(), this, expectedResult);
}
else
{
throw System.Linq.Expressions.Error.DynamicBinderResultNotAssignable(body.Type, this, expectedResult);
}
}
// if the target is IDO, standard binders ask it to bind the rule so we may have a target-specific binding.
// it makes sense to restrict on the target's type in such cases.
// ideally IDO metaobjects should do this, but they often miss that type of "this" is significant.
if (IsStandardBinder && args[0] as IDynamicMetaObjectProvider != null)
{
if (restrictions == BindingRestrictions.Empty)
{
throw System.Linq.Expressions.Error.DynamicBindingNeedsRestrictions(target.Value.GetType(), this);
}
}
// Add the return
if (body.NodeType != ExpressionType.Goto)
{
body = Expression.Return(returnLabel, body);
}
// Finally, add restrictions
if (restrictions != BindingRestrictions.Empty)
{
body = Expression.IfThen(restrictions.ToExpression(), body);
}
return(body);
}
internal static void DumpRule(DynamicMetaObjectBinder/*!*/ action, BindingRestrictions/*!*/ restrictions, Expression/*!*/ expr) {
#if DEBUG && !SILVERLIGHT && CLR2
if (RubyOptions.ShowRules) {
var oldColor = Console.ForegroundColor;
try {
Console.ForegroundColor = ConsoleColor.Cyan;
Console.WriteLine("Rule #{0}: {1}", Interlocked.Increment(ref _ruleCounter), action);
Console.ForegroundColor = ConsoleColor.DarkGray;
if (!_DumpingExpression) {
var d = (restrictions != BindingRestrictions.Empty) ? Expression.IfThen(restrictions.ToExpression(), expr) : expr;
_DumpingExpression = true;
d.DumpExpression(Console.Out);
Console.WriteLine();
}
} finally {
_DumpingExpression = false;
Console.ForegroundColor = oldColor;
}
}
#endif
}
internal static void DumpRule(CallSiteBinder/*!*/ binder, BindingRestrictions/*!*/ restrictions, Expression/*!*/ expr) {
#if DEBUG && !SILVERLIGHT
if (RubyOptions.ShowRules) {
var oldColor = Console.ForegroundColor;
try {
Console.ForegroundColor = ConsoleColor.Cyan;
Console.WriteLine("Rule #{0}: {1}", Interlocked.Increment(ref _ruleCounter), binder);
Console.ForegroundColor = ConsoleColor.DarkGray;
if (!_DumpingExpression) {
var d = (restrictions != BindingRestrictions.Empty) ? Expression.IfThen(restrictions.ToExpression(), expr) : expr;
_DumpingExpression = true;
#if CLR2
d.DumpExpression(Console.Out);
#else
try {
if (_dumpViewMethod == null) {
_dumpViewMethod = typeof(Expression).GetMethod("get_DebugView", BindingFlags.NonPublic | BindingFlags.Instance);
}
Console.WriteLine(_dumpViewMethod.Invoke(d, ArrayUtils.EmptyObjects));
Console.WriteLine();
} catch {
// nop
}
#endif
}
} finally {
_DumpingExpression = false;
Console.ForegroundColor = oldColor;
}
}
#endif
}
private Expression GetMetaObjectRule(Expression bindingExpression, BindingRestrictions bindingRestrictions, LabelTarget @return) {
Expression body = AddReturn(bindingExpression, @return);
if (bindingRestrictions != BindingRestrictions.Empty) {
// add the test only if we have one
body = Expression.Condition(
bindingRestrictions.ToExpression(),
body,
Expression.Empty()
);
}
return body;
}
public sealed override Expression Bind(object[] args, ReadOnlyCollection <ParameterExpression> parameters, LabelTarget returnLabel)
{
Type returnType;
ContractUtils.RequiresNotNull(args, "args");
ContractUtils.RequiresNotNull(parameters, "parameters");
ContractUtils.RequiresNotNull(returnLabel, "returnLabel");
if (args.Length == 0)
{
throw Error.OutOfRange("args.Length", 1);
}
if (parameters.Count == 0)
{
throw Error.OutOfRange("parameters.Count", 1);
}
if (args.Length != parameters.Count)
{
throw new ArgumentOutOfRangeException("args");
}
if (this.IsStandardBinder)
{
returnType = this.ReturnType;
if ((returnLabel.Type != typeof(void)) && !TypeUtils.AreReferenceAssignable(returnLabel.Type, returnType))
{
throw Error.BinderNotCompatibleWithCallSite(returnType, this, returnLabel.Type);
}
}
else
{
returnType = returnLabel.Type;
}
DynamicMetaObject target = DynamicMetaObject.Create(args[0], parameters[0]);
DynamicMetaObject[] objArray = CreateArgumentMetaObjects(args, parameters);
DynamicMetaObject obj3 = this.Bind(target, objArray);
if (obj3 == null)
{
throw Error.BindingCannotBeNull();
}
Expression expression = obj3.Expression;
BindingRestrictions restrictions = obj3.Restrictions;
if ((returnType != typeof(void)) && !TypeUtils.AreReferenceAssignable(returnType, expression.Type))
{
if (target.Value is IDynamicMetaObjectProvider)
{
throw Error.DynamicObjectResultNotAssignable(expression.Type, target.Value.GetType(), this, returnType);
}
throw Error.DynamicBinderResultNotAssignable(expression.Type, this, returnType);
}
if ((this.IsStandardBinder && (args[0] is IDynamicMetaObjectProvider)) && (restrictions == BindingRestrictions.Empty))
{
throw Error.DynamicBindingNeedsRestrictions(target.Value.GetType(), this);
}
restrictions = AddRemoteObjectRestrictions(restrictions, args, parameters);
if (expression.NodeType != ExpressionType.Goto)
{
expression = Expression.Return(returnLabel, expression);
}
if (restrictions != BindingRestrictions.Empty)
{
expression = Expression.IfThen(restrictions.ToExpression(), expression);
}
return(expression);
}
