public static Descriptor FindDirective(SelectionCriteria criteria, object o)
{
var type = criteria.Type;
lock (FormatDefinitions)
{
while (type != null)
{
if (!FormatDefinitions.TryGetValue(type, out var descriptors))
{
if (type.IsGenericType)
{
// Try again with the unspecialized type
var generic = type.GetGenericTypeDefinition();
FormatDefinitions.TryGetValue(generic, out descriptors);
}
}
if (descriptors != null)
{
foreach (var descriptor in descriptors)
{
switch (criteria.Style)
{
case Style.List:
if (!(descriptor is ListDescriptor))
{
continue;
}
break;
case Style.Table:
if (!(descriptor is TableDescriptor))
{
continue;
}
break;
}
if (descriptor.When != null && !descriptor.When.Applies(o))
{
continue;
}
if (!string.IsNullOrEmpty(criteria.Name) &&
!criteria.Name.Equals(descriptor.Name, StringComparison.OrdinalIgnoreCase))
{
continue;
}
return(descriptor.Clone(criteria.Type));
}
}
type = type.BaseType;
}
}
return(null);
}
/// <summary>
/// Format an object using the specified descriptor.
/// </summary>
/// <param name="obj">The object to format.</param>
/// <param name="descriptor">The formatting descriptor.</param>
internal static IEnumerable <FormatInstruction> Format(object obj, Descriptor descriptor)
{
Type type;
if (obj is PSObject psobj)
{
type = psobj.BaseObject.GetType();
}
else
{
type = obj.GetType();
psobj = new PSObject(obj);
}
if (descriptor == null)
{
descriptor = psobj.Properties[AttachedFormatPropertyName]?.Value as Descriptor;
}
Style style = Style.Default;
if (descriptor != null)
{
switch (descriptor)
{
case ListDescriptor lf:
style = Style.List;
// Don't use the descriptor if there are no entries.
if (lf.Entries.Count == 0)
{
descriptor = null;
}
break;
case TableDescriptor tf:
style = Style.Table;
// Don't use the descriptor if there are no entries.
if (tf.Columns.Count == 0)
{
descriptor = null;
}
break;
}
if (descriptor != null && descriptor.Type == null)
{
descriptor = descriptor.Clone(type);
}
}
var criteria = new SelectionCriteria(
descriptor: descriptor,
style: style,
type: type,
name: null);
return(_site.Target.Invoke(_site, psobj, criteria));
}
private Expression BindDescriptor(
BasicDescriptor descriptor,
Expression toFormat,
Expression criteria,
LabelTarget returnLabel)
{
return(Expression.IfThen(
SelectionCriteria.GetCompatibleCall(criteria, descriptor, toFormat),
Expression.Return(returnLabel,
Expression.Call(GetBasicFormattedResultMethodInfo, Expression.Convert(toFormat, typeof(object))))));
}
Expression BindDescriptor(
ListDescriptor descriptor,
Expression toFormat,
Expression criteria,
LabelTarget returnLabel)
{
Expression GetPropertyBinding(ListDescriptorEntry entry)
{
switch (entry)
{
case ListDescriptorPropertyEntry ldpe:
var binder = FormatGetMemberBinder.Get(ldpe.PropertyName);
return(Expression.Dynamic(binder, typeof(object), toFormat));
case ListDescriptorComputedPropertyEntry ldcpe:
throw new NotImplementedException();
}
throw new InvalidOperationException();
}
int maxLabel = -1;
foreach (var entry in descriptor.Entries)
{
var label = entry.GetLabel();
maxLabel = Math.Max(maxLabel, label.Length);
}
var formatExpr = "{0,-" + maxLabel + "} : {1}";
var expressions = new Expression[descriptor.Entries.Count];
for (var i = 0; i < expressions.Length; i++)
{
var entry = descriptor.Entries[i];
expressions[i] = Expression.Call(GetPropertyLineFormattedResultMethodInfo,
Expression.Constant(formatExpr),
Expression.Constant(entry.GetLabel()),
GetPropertyBinding(entry));
}
return(Expression.IfThen(
SelectionCriteria.GetCompatibleCall(criteria, descriptor, toFormat),
Expression.Return(returnLabel,
Expression.NewArrayInit(typeof(FormatInstruction), expressions))));
}
Expression BindDescriptor(
TableDescriptor descriptor,
Expression toFormat,
Expression criteria,
LabelTarget returnLabel)
{
var expressions = new Expression[descriptor.Columns.Count];
for (var i = 0; i < expressions.Length; i++)
{
var col = descriptor.Columns[i];
if (col.Method != null)
{
var type = descriptor.Type;
expressions[i] = Expression.Dynamic(
ToStringBinder.Instance,
typeof(string),
Expression.TryCatch(
Expression.Call(col.Method,
Expression.Convert(
Expression.Property(
Expression.Convert(toFormat, typeof(PSObject)), "BaseObject"),
type)),
Expression.Catch(typeof(Exception), Expression.Default(col.Method.ReturnType))));
continue;
}
var binder = FormatGetMemberBinder.Get(col.Property);
expressions[i] = Expression.Dynamic(
ToStringBinder.Instance,
typeof(string),
Expression.Dynamic(binder, typeof(object), toFormat));
}
return(Expression.IfThen(
SelectionCriteria.GetCompatibleCall(criteria, descriptor, toFormat),
Expression.Return(returnLabel,
Expression.Call(NewEmitTableRowMethodInfo,
Expression.Constant(descriptor),
Expression.NewArrayInit(typeof(string), expressions)))));
}
public static Descriptor Generate(SelectionCriteria criteria)
{
return(new BasicDescriptor(criteria.Type));
}