public object VisitConvertExpression(ConvertExpressionAst convertExpressionAst)
{
object constantValue;
if (!CompilingConstantExpression && IsConstantValueVisitor.IsConstant(convertExpressionAst, out constantValue))
{
return Expression.Constant(constantValue);
}
var typeName = convertExpressionAst.Type.TypeName;
var hashTableAst = convertExpressionAst.Child as HashtableAst;
Expression childExpr = null;
if (hashTableAst != null)
{
var temp = NewTemp(typeof(OrderedDictionary), "orderedDictionary");
if (typeName.FullName.Equals(LanguagePrimitives.OrderedAttribute, StringComparison.OrdinalIgnoreCase))
{
return Expression.Block(typeof(OrderedDictionary),
new[] { temp },
BuildHashtable(hashTableAst.KeyValuePairs, temp, ordered: true));
}
if (typeName.FullName.Equals("PSCustomObject", StringComparison.OrdinalIgnoreCase))
{
// pure laziness here - we should construct the PSObject directly. Instead, we're relying on the conversion
// to create the PSObject from an OrderedDictionary.
childExpr = Expression.Block(typeof(OrderedDictionary),
new[] { temp },
BuildHashtable(hashTableAst.KeyValuePairs, temp, ordered: true));
}
}
if (convertExpressionAst.IsRef())
{
var varExpr = convertExpressionAst.Child as VariableExpressionAst;
if (varExpr != null && varExpr.VariablePath.IsVariable && !varExpr.IsConstantVariable())
{
// We'll wrap the variable in a PSReference, but not the constant variables ($true, $false, $null) because those
// can't be changed.
IEnumerable<PropertyInfo> unused1;
bool unused2;
var varType = varExpr.GetVariableType(this, out unused1, out unused2);
return Expression.Call(CachedReflectionInfo.VariableOps_GetVariableAsRef,
Expression.Constant(varExpr.VariablePath), _executionContextParameter,
varType != null && varType != typeof(object)
? Expression.Constant(varType, typeof(Type))
: ExpressionCache.NullType);
}
}
if (childExpr == null)
{
childExpr = Compile(convertExpressionAst.Child);
}
if (typeName.FullName.Equals("PSCustomObject", StringComparison.OrdinalIgnoreCase))
{
// We can't use the normal PSConvertBinder because it is strongly typed, and we
// play some funny games with the PSCustomObject type (externally, it's just an
// alias for PSObject, internally we do other stuff with it.)
return DynamicExpression.Dynamic(PSCustomObjectConverter.Get(), typeof(object), childExpr);
}
return ConvertValue(convertExpressionAst.Type, childExpr);
}
public object VisitConvertExpression(ConvertExpressionAst convertExpressionAst)
{
object obj2;
if (!this.CompilingConstantExpression && IsConstantValueVisitor.IsConstant(convertExpressionAst, out obj2, false, false))
{
return Expression.Constant(obj2);
}
ITypeName typeName = convertExpressionAst.Type.TypeName;
HashtableAst child = convertExpressionAst.Child as HashtableAst;
Expression expression = null;
if (child != null)
{
ParameterExpression temp = this.NewTemp(typeof(OrderedDictionary), "orderedDictionary");
if (typeName.FullName.Equals("ordered", StringComparison.OrdinalIgnoreCase))
{
return Expression.Block(typeof(OrderedDictionary), new ParameterExpression[] { temp }, this.BuildHashtable(child.KeyValuePairs, temp, true));
}
if (typeName.FullName.Equals("PSCustomObject", StringComparison.OrdinalIgnoreCase))
{
expression = Expression.Block(typeof(OrderedDictionary), new ParameterExpression[] { temp }, this.BuildHashtable(child.KeyValuePairs, temp, true));
}
}
if (convertExpressionAst.IsRef())
{
VariableExpressionAst ast2 = convertExpressionAst.Child as VariableExpressionAst;
if (((ast2 != null) && ast2.VariablePath.IsVariable) && !ast2.IsConstantVariable())
{
IEnumerable<PropertyInfo> enumerable;
bool flag;
Type type = ast2.GetVariableType(this, out enumerable, out flag);
return Expression.Call(CachedReflectionInfo.VariableOps_GetVariableAsRef, Expression.Constant(ast2.VariablePath), _executionContextParameter, ((type != null) && !type.Equals(typeof(object))) ? Expression.Constant(type) : ExpressionCache.NullType);
}
}
if (expression == null)
{
expression = this.Compile(convertExpressionAst.Child);
}
if (typeName.FullName.Equals("PSCustomObject", StringComparison.OrdinalIgnoreCase))
{
return Expression.Dynamic(PSCustomObjectConverter.Get(), typeof(object), expression);
}
return ConvertValue(typeName, expression);
}
