public virtual object GetContextVariable(string variableName)
{
object returnValue;
variableName = variableName.Trim('@');
var member = this.GetType().GetMember(variableName, BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);
if (member.Length > 0)
{
if (member[0].MemberType == MemberTypes.Property)
{
returnValue = ((PropertyInfo)member[0]).GetValue(this);
}
else if (member[0].MemberType == MemberTypes.Field)
{
returnValue = ((FieldInfo)member[0]).GetValue(this);
}
else
{
throw new HandlebarsRuntimeException("Context variable references a member that is not a field or property");
}
}
else if (_parent != null)
{
returnValue = _parent.GetContextVariable(variableName);
}
else
{
returnValue = null;
}
return(returnValue);
}
//TODO: make path resolution logic smarter
private object ResolvePath(BindingContext context, string path)
{
if (_resolutionCache.ContainsKey(context) && _resolutionCache[context].ContainsKey(path))
{
return(_resolutionCache[context][path]);
}
var instance = context.Value;
foreach (var segment in path.Split('/'))
{
if (segment == "..")
{
context = context.ParentContext;
if (context == null)
{
throw new HandlebarsCompilerException("Path expression tried to reference parent of root");
}
}
else if (segment == "this")
{
continue;
}
else if (segment.StartsWith("@"))
{
var contextValue = context.GetContextVariable(segment.Substring(1));
if (contextValue == null)
{
throw new HandlebarsRuntimeException("Couldn't bind to context variable");
}
instance = contextValue;
break;
}
else
{
foreach (var memberName in segment.Split('.'))
{
try
{
instance = AccessMember(instance, memberName);
}
catch (Exception)
{
instance = new UndefinedBindingResult();
break;
}
}
}
}
if (_resolutionCache.ContainsKey(context) == false)
{
_resolutionCache.Add(context, new Dictionary <string, object>());
}
_resolutionCache[context].Add(path, instance);
return(instance);
}
//TODO: make path resolution logic smarter
private object ResolvePath(BindingContext context, string path)
{
if (_resolutionCache.ContainsKey(context) && _resolutionCache[context].ContainsKey(path))
{
return _resolutionCache[context][path];
}
var instance = context.Value;
foreach(var segment in path.Split ('/'))
{
if(segment == "..")
{
context = context.ParentContext;
if(context == null)
{
throw new HandlebarsCompilerException("Path expression tried to reference parent of root");
}
}
else if(segment == "this")
{
continue;
}
else if (segment.StartsWith("@"))
{
var contextValue = context.GetContextVariable(segment.Substring(1));
if (contextValue == null)
{
throw new HandlebarsRuntimeException("Couldn't bind to context variable");
}
instance = contextValue;
break;
}
else
{
foreach (var memberName in segment.Split('.'))
{
try
{
instance = AccessMember(instance, memberName);
}
catch (Exception)
{
instance = new UndefinedBindingResult();
break;
}
}
}
}
if (_resolutionCache.ContainsKey(context) == false)
{
_resolutionCache.Add(context, new Dictionary<string, object>());
}
_resolutionCache[context].Add(path, instance);
return instance;
}