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);
        }
Esempio n. 2
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        //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);
        }
Esempio n. 3
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        //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;
        }