/// <summary>
/// Will walk the path by using the path seperator "." and evaluate the object at the end
/// </summary>
/// <returns></returns>
internal async ContextObjectPromise GetContextForPath(Traversable elements,
ScopeData scopeData,
IMorestachioExpression morestachioExpression)
{
if (Key == "x:null" || !elements.HasValue)
{
return(this);
}
//look at the first element if its an alias switch to that alias
//var peekPathPart = elements.Peek();
if (elements.Count == 1 && elements.Current.Value == PathType.Null)
{
return(Options.CreateContextObject("x:null", CancellationToken, null));
}
if (elements.Current.Value == PathType.DataPath)
{
var getFromAlias = scopeData.GetVariable(elements.Current.Key);
if (getFromAlias != null)
{
elements = elements.Next();
return(await getFromAlias.GetContextForPathInternal(elements, scopeData, morestachioExpression));
}
}
return(await GetContextForPathInternal(elements, scopeData, morestachioExpression));
}
/// <summary>
/// Will walk the path by using the path seperator "." and evaluate the object at the end
/// </summary>
/// <returns></returns>
internal ContextObject GetContextForPath(Traversable elements,
ScopeData scopeData,
IMorestachioExpression morestachioExpression)
{
if (_key == "x:null" || !elements.HasValue)
{
return(this);
}
//look at the first element if its an alias switch to that alias
//var peekPathPart = elements.Peek();
if (elements.Count == 1 && elements.Current.Value == PathType.Null)
{
return(scopeData.ParserOptions.CreateContextObject("x:null", null));
}
var targetContext = this;
if (elements.Current.Value == PathType.DataPath)
{
var getFromAlias = scopeData.GetVariable(targetContext, elements.Current.Key);
if (getFromAlias != null)
{
elements = elements.Next();
targetContext = getFromAlias;
}
}
return(targetContext.LoopContextTraversable(elements, scopeData, morestachioExpression));
//return await targetContext.GetContextForPathInternal(elements, scopeData, morestachioExpression);
}
internal ContextObject LoopContextTraversable(Traversable elements,
ScopeData scopeData,
IMorestachioExpression morestachioExpression)
{
ContextObject context = this;
while (elements != null && elements.HasValue)
{
context = context.GetContextForPathInternal(elements, scopeData, morestachioExpression);
elements = elements.Next();
}
return(context);
}
private async ContextObjectPromise GetContextForPathInternal(
Traversable elements,
ScopeData scopeData,
IMorestachioExpression morestachioExpression)
{
var retval = this;
if (elements == null)
{
return(retval);
}
var preHandeld = HandlePathContext(elements, elements.Current, morestachioExpression, scopeData);
if (preHandeld != null)
{
return(preHandeld);
}
var type = Value?.GetType();
if (elements.Current.Value == PathType.RootSelector) //go the root object
{
var parent = Parent ?? this;
var lastParent = parent;
while (parent != null)
{
parent = parent.Parent;
if (parent != null)
{
lastParent = parent;
}
}
if (lastParent != null)
{
retval = await lastParent.GetContextForPathInternal(elements.Next(), scopeData,
morestachioExpression);
}
}
else if (elements.Current.Value == PathType.ParentSelector) //go one level up
{
if (Parent != null)
{
var parent = FindNextNaturalContextObject();
ContextObject parentsRetVal = null;
if (parent != null && parent.Parent != null)
{
parentsRetVal = await parent.Parent
.GetContextForPathInternal(elements.Next(), scopeData, morestachioExpression);
}
if (parentsRetVal != null)
{
retval = parentsRetVal;
}
else
{
retval = await GetContextForPathInternal(elements.Next(), scopeData, morestachioExpression);
}
}
else
{
retval = await GetContextForPathInternal(elements.Next(), scopeData, morestachioExpression);
}
}
else if (elements.Current.Value == PathType.ObjectSelector)
//enumerate ether an IDictionary, an cs object or an IEnumerable to a KeyValuePair array
{
//await EnsureValue();
if (Value is null)
{
return(Options.CreateContextObject("x:null", CancellationToken, null));
}
//ALWAYS return the context, even if the value is null.
ContextObject innerContext = null;
switch (Value)
{
case IDictionary <string, object> dictList:
innerContext = Options.CreateContextObject(elements.Current.Key, CancellationToken,
dictList.Select(e => e), this);
break;
default:
{
if (Value != null)
{
innerContext = Options.CreateContextObject(elements.Current.Key, CancellationToken,
type
.GetTypeInfo()
.GetProperties(BindingFlags.Instance | BindingFlags.Public)
.Where(e => !e.IsSpecialName && !e.GetIndexParameters().Any())
.Select(e => new KeyValuePair <string, object>(e.Name, e.GetValue(Value))),
this);
}
break;
}
}
retval = await innerContext.GetContextForPathInternal(elements.Next(), scopeData,
morestachioExpression);
}
else if (elements.Current.Value == PathType.Boolean)
{
if (elements.Current.Key == "true" || elements.Current.Key == "false")
{
var booleanContext =
Options.CreateContextObject(".", CancellationToken, elements.Current.Key == "true", this);
booleanContext.IsNaturalContext = IsNaturalContext;
return(await booleanContext.GetContextForPathInternal(elements.Next(), scopeData,
morestachioExpression));
}
}
else if (elements.Current.Value == PathType.Null)
{
return(Options.CreateContextObject("x:null", CancellationToken, null, null));
}
else if (elements.Current.Value == PathType.DataPath)
{
//await EnsureValue();
if (Value is null)
{
return(Options.CreateContextObject("x:null", CancellationToken, null));
}
//TODO: handle array accessors and maybe "special" keys.
//ALWAYS return the context, even if the value is null.
var innerContext = Options.CreateContextObject(elements.Current.Key, CancellationToken, null, this);
if (Options.ValueResolver?.CanResolve(type, Value, elements.Current.Key, innerContext) == true)
{
innerContext._value = Options.ValueResolver.Resolve(type, Value, elements.Current.Key, innerContext);
}
else if (!Options.HandleDictionaryAsObject && Value is IDictionary <string, object> ctx)
{
if (!ctx.TryGetValue(elements.Current.Key, out var o))
{
Options.OnUnresolvedPath(new InvalidPathEventArgs(this, morestachioExpression,
elements.Current.Key, Value?.GetType()));
}
innerContext._value = o;
}
else if (Value is IMorestachioPropertyResolver cResolver)
{
if (!cResolver.TryGetValue(elements.Current.Key, out var o))
{
Options.OnUnresolvedPath(new InvalidPathEventArgs(this, morestachioExpression,
elements.Current.Key, Value?.GetType()));
}
innerContext._value = o;
}
else if (Value != null)
{
if (Value is ICustomTypeDescriptor descriptor)
{
var propertyDescriptor = descriptor.GetProperties().Find(elements.Current.Key, false);
if (propertyDescriptor != null)
{
innerContext._value = propertyDescriptor.GetValue(Value);
}
else
{
Options.OnUnresolvedPath(new InvalidPathEventArgs(this, morestachioExpression,
elements.Current.Key, Value?.GetType()));
}
}
else
{
var propertyInfo = type.GetTypeInfo().GetProperty(elements.Current.Key);
if (propertyInfo != null)
{
innerContext._value = propertyInfo.GetValue(Value);
}
else
{
Options.OnUnresolvedPath(new InvalidPathEventArgs(this, morestachioExpression,
elements.Current.Key, Value?.GetType()));
}
}
}
retval = await innerContext.GetContextForPathInternal(elements.Next(), scopeData,
morestachioExpression);
}
return(retval);
}