public override DynamicMetaObject FallbackUnaryOperation(DynamicMetaObject target, DynamicMetaObject errorSuggestion)
{
var arg = Expression.Convert(target.Expression, target.LimitType);
var restrictions = BindingRestrictionsHelpers.GetRuntimeTypeRestriction(target);
Expression res = null;
switch (Operation)
{
case ExpressionType.Decrement:
if (Binders.IsFloatingPoint(target.LimitType))
{
res = Expression.Decrement(_context.Convert(arg, typeof(double)));
}
else
{
res = Expression.Decrement(_context.Convert(arg, typeof(long)));
}
break;
case ExpressionType.Increment:
if (Binders.IsFloatingPoint(target.LimitType))
{
res = Expression.Increment(_context.Convert(arg, typeof(double)));
}
else
{
res = Expression.Increment(_context.Convert(arg, typeof(long)));
}
break;
case ExpressionType.Negate:
if (Binders.IsFloatingPoint(target.LimitType))
{
res = Expression.Negate(_context.Convert(arg, typeof(double)));
}
else
{
res = Expression.Negate(_context.Convert(arg, typeof(long)));
}
break;
case ExpressionType.Not:
res = Expression.Condition(_context.Convert(arg, typeof(bool)), Expression.Constant(0L), Expression.Constant(1L));
break;
case ExpressionType.OnesComplement:
res = Expression.OnesComplement(_context.Convert(arg, typeof(long)));
break;
case ExpressionType.UnaryPlus:
if (Binders.IsFloatingPoint(target.LimitType))
{
res = _context.Convert(arg, typeof(double));
}
else if (Binders.IsInteger(target.LimitType))
{
res = _context.Convert(arg, typeof(long));
}
else if (target.LimitType == typeof(string))
{
res = Expression.Call(new Func <string, object>(Binders.ConvertNumber).Method, arg);
}
break;
}
if (res != null)
{
if (res.Type != typeof(object))
{
return(new DynamicMetaObject(Expression.Convert(res, typeof(object)), restrictions));
}
else
{
return(new DynamicMetaObject(res, restrictions));
}
}
else
{
return(errorSuggestion ?? new DynamicMetaObject(Expression.Throw(Expression.Constant(new InvalidOperationException("不正な単項演算です。")), typeof(object)), restrictions));
}
}
public override DynamicMetaObject FallbackBinaryOperation(DynamicMetaObject target, DynamicMetaObject arg, DynamicMetaObject errorSuggestion)
{
var left = Expression.Convert(target.Expression, target.LimitType);
var right = Expression.Convert(arg.Expression, arg.LimitType);
Expression res = null;
switch (Operation)
{
case ExpressionType.Add:
if (target.LimitType == typeof(string) || arg.LimitType == typeof(string))
{
res = Expression.Call(new Func <string, string, string>(string.Concat).Method, _context.Convert(left, typeof(string)), _context.Convert(right, typeof(string)));
}
else if (Binders.IsFloatingPoint(target.LimitType) || Binders.IsFloatingPoint(arg.LimitType))
{
res = Expression.Add(_context.Convert(left, typeof(double)), _context.Convert(right, typeof(double)));
}
else
{
res = Expression.Add(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
}
break;
case ExpressionType.And:
res = Expression.And(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
break;
case ExpressionType.Divide:
res = Expression.Divide(_context.Convert(left, typeof(double)), _context.Convert(right, typeof(double)));
break;
case ExpressionType.Equal:
res = Expression.Condition(Equal(left, right), Expression.Constant(1L), Expression.Constant(0L));
break;
case ExpressionType.ExclusiveOr:
res = Expression.ExclusiveOr(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
break;
case ExpressionType.GreaterThan:
{
Expression exp;
if (target.LimitType == typeof(string) && arg.LimitType == typeof(string))
{
exp = Expression.GreaterThan(Expression.Call(new Func <string, string, int>(string.CompareOrdinal).Method, left, right), Expression.Constant(0));
}
else if (Binders.IsFloatingPoint(target.LimitType) || Binders.IsFloatingPoint(arg.LimitType))
{
exp = Expression.GreaterThan(_context.Convert(left, typeof(double)), _context.Convert(right, typeof(double)));
}
else
{
exp = Expression.GreaterThan(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
}
res = Expression.Condition(exp, Expression.Constant(1L), Expression.Constant(0L));
}
break;
case ExpressionType.GreaterThanOrEqual:
{
Expression exp;
if (target.LimitType == typeof(string) && arg.LimitType == typeof(string))
{
exp = Expression.GreaterThanOrEqual(Expression.Call(new Func <string, string, int>(string.CompareOrdinal).Method, left, right), Expression.Constant(0));
}
else if (Binders.IsFloatingPoint(target.LimitType) || Binders.IsFloatingPoint(arg.LimitType))
{
exp = Expression.GreaterThanOrEqual(_context.Convert(left, typeof(double)), _context.Convert(right, typeof(double)));
}
else
{
exp = Expression.GreaterThanOrEqual(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
}
res = Expression.Condition(exp, Expression.Constant(1L), Expression.Constant(0L));
}
break;
case ExpressionType.LeftShift:
res = Expression.LeftShift(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(int)));
break;
case ExpressionType.LessThan:
{
Expression exp;
if (target.LimitType == typeof(string) && arg.LimitType == typeof(string))
{
exp = Expression.LessThan(Expression.Call(new Func <string, string, int>(string.CompareOrdinal).Method, left, right), Expression.Constant(0));
}
else if (Binders.IsFloatingPoint(target.LimitType) || Binders.IsFloatingPoint(arg.LimitType))
{
exp = Expression.LessThan(_context.Convert(left, typeof(double)), _context.Convert(right, typeof(double)));
}
else
{
exp = Expression.LessThan(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
}
res = Expression.Condition(exp, Expression.Constant(1L), Expression.Constant(0L));
}
break;
case ExpressionType.LessThanOrEqual:
{
Expression exp;
if (target.LimitType == typeof(string) && arg.LimitType == typeof(string))
{
exp = Expression.LessThanOrEqual(Expression.Call(new Func <string, string, int>(string.CompareOrdinal).Method, left, right), Expression.Constant(0));
}
else if (Binders.IsFloatingPoint(target.LimitType) || Binders.IsFloatingPoint(arg.LimitType))
{
exp = Expression.LessThanOrEqual(_context.Convert(left, typeof(double)), _context.Convert(right, typeof(double)));
}
else
{
exp = Expression.LessThanOrEqual(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
}
res = Expression.Condition(exp, Expression.Constant(1L), Expression.Constant(0L));
}
break;
case ExpressionType.Modulo:
res = Expression.Modulo(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
break;
case ExpressionType.Multiply:
if (Binders.IsFloatingPoint(target.LimitType) || Binders.IsFloatingPoint(arg.LimitType))
{
res = Expression.Multiply(_context.Convert(left, typeof(double)), _context.Convert(right, typeof(double)));
}
else
{
res = Expression.Multiply(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
}
break;
case ExpressionType.NotEqual:
res = Expression.Condition(Equal(left, right), Expression.Constant(0L), Expression.Constant(1L));
break;
case ExpressionType.Or:
res = Expression.Or(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
break;
case ExpressionType.RightShift:
res = Expression.RightShift(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(int)));
break;
case ExpressionType.Subtract:
if (Binders.IsFloatingPoint(target.LimitType) || Binders.IsFloatingPoint(arg.LimitType))
{
res = Expression.Subtract(_context.Convert(left, typeof(double)), _context.Convert(right, typeof(double)));
}
else
{
res = Expression.Subtract(_context.Convert(left, typeof(long)), _context.Convert(right, typeof(long)));
}
break;
}
var restrictions = BindingRestrictionsHelpers.GetRuntimeTypeRestriction(target).Merge(BindingRestrictionsHelpers.GetRuntimeTypeRestriction(arg));
if (res != null)
{
return(new DynamicMetaObject(Expression.Convert(res, typeof(object)), restrictions));
}
else
{
return(errorSuggestion ?? new DynamicMetaObject(Expression.Throw(Expression.Constant(new InvalidOperationException("不正な二項演算です。")), typeof(object)), restrictions));
}
}