public static Type ExtractChildObjectTypeFromPath([NotNull] Type modelType, [NotNull] ExcelTemplatePath path)
{
var currType = modelType;
foreach (var part in path.PartsWithIndexers)
{
var childPropertyType = ExtractPropertyInfo(currType, part).PropertyType;
if (TemplateDescriptionHelper.IsCollectionAccessPathPart(part))
{
if (TypeCheckingHelper.IsDictionary(childPropertyType))
{
var(keyType, valueType) = TypeCheckingHelper.GetDictionaryGenericTypeArguments(childPropertyType);
TemplateDescriptionHelper.ParseCollectionIndexerOrThrow(TemplateDescriptionHelper.GetCollectionAccessPathPartIndex(part), keyType);
currType = valueType;
}
else if (TypeCheckingHelper.IsIList(childPropertyType))
{
TemplateDescriptionHelper.ParseCollectionIndexerOrThrow(TemplateDescriptionHelper.GetCollectionAccessPathPartIndex(part), typeof(int));
currType = TypeCheckingHelper.GetEnumerableItemType(childPropertyType);
}
else
{
throw new ObjectPropertyExtractionException($"Not supported collection type {childPropertyType}");
}
}
else if (TemplateDescriptionHelper.IsArrayPathPart(part))
{
if (TypeCheckingHelper.IsIList(childPropertyType))
{
currType = TypeCheckingHelper.GetIListItemType(childPropertyType);
}
else
{
throw new ObjectPropertyExtractionException($"Not supported collection type {childPropertyType}");
}
}
else
{
currType = childPropertyType;
}
}
return(currType);
}
private static bool TryExtractDirectChild([NotNull] object model, [NotNull] string pathPart, out object child)
{
child = null;
if (TemplateDescriptionHelper.IsCollectionAccessPathPart(pathPart))
{
var name = TemplateDescriptionHelper.GetCollectionAccessPathPartName(pathPart);
var key = TemplateDescriptionHelper.GetCollectionAccessPathPartIndex(pathPart);
if (!TryExtractCurrentChildPropertyInfo(model, name, out var collectionPropertyInfo))
{
return(false);
}
if (TypeCheckingHelper.IsDictionary(collectionPropertyInfo.PropertyType))
{
var indexer = TemplateDescriptionHelper.ParseCollectionIndexerOrThrow(key, TypeCheckingHelper.GetDictionaryGenericTypeArguments(collectionPropertyInfo.PropertyType).keyType);
var dict = collectionPropertyInfo.GetValue(model, null);
if (dict == null)
{
return(true);
}
child = ((IDictionary)dict)[indexer];
return(true);
}
if (TypeCheckingHelper.IsIList(collectionPropertyInfo.PropertyType))
{
var indexer = (int)TemplateDescriptionHelper.ParseCollectionIndexerOrThrow(key, typeof(int));
var list = collectionPropertyInfo.GetValue(model, null);
if (list == null)
{
return(true);
}
child = ((IList)list)[indexer];
return(true);
}
throw new ObjectPropertyExtractionException($"Unexpected child type: expected dictionary or array (pathPath='{pathPart}'), but model is '{collectionPropertyInfo.PropertyType}' in '{model.GetType()}'");
}
if (!TryExtractCurrentChildPropertyInfo(model, pathPart, out var propertyInfo))
{
return(false);
}
child = propertyInfo.GetValue(model, null);
return(true);
}
private static (Expression currNodeExpression, Type currNodeType, List <Expression> statements) BuildExpandingOfCollectionAccessPart([NotNull] Expression currNodeExpression, [NotNull] Type currNodeType, [NotNull] string part)
{
var statements = new List <Expression>();
if (TypeCheckingHelper.IsDictionary(currNodeType))
{
statements.Add(ExpressionPrimitives.CreateValueInitStatement(currNodeExpression, currNodeType));
var(dictKeyType, dictValueType) = TypeCheckingHelper.GetDictionaryGenericTypeArguments(currNodeType);
var indexer = TemplateDescriptionHelper.ParseCollectionIndexerOrThrow(TemplateDescriptionHelper.GetCollectionAccessPathPartIndex(part), dictKeyType);
var dictElementExpression = Expression.Property(currNodeExpression, "Item", Expression.Constant(indexer));
statements.Add(ExpressionPrimitives.CreateDictValueInitStatement(currNodeExpression, dictKeyType, dictValueType, indexer));
currNodeExpression = dictElementExpression;
currNodeType = dictValueType;
}
else if (currNodeType.IsArray)
{
var arrayItemType = currNodeType.GetElementType() ?? throw new ObjectPropertyExtractionException($"Array of type '{currNodeType}' has no item type");
var indexer = TemplateDescriptionHelper.ParseCollectionIndexerOrThrow(TemplateDescriptionHelper.GetCollectionAccessPathPartIndex(part), typeof(int));
statements.Add(ExpressionPrimitives.CreateArrayExtendStatement(currNodeExpression, Expression.Constant((int)indexer + 1), arrayItemType));
var arrayItemExpression = Expression.ArrayAccess(currNodeExpression, Expression.Constant(indexer));
currNodeExpression = arrayItemExpression;
currNodeType = arrayItemType;
statements.Add(ExpressionPrimitives.CreateValueInitStatement(currNodeExpression, currNodeType));
}
else
{
throw new ObjectPropertyExtractionException("Only dicts and arrays are supported as collections");
}
return(currNodeExpression, currNodeType, statements);
}
