internal override bool TryEvaluate(CompilationState state, out Context context)
{
//Copy Stack as identifier elements manipulate (push, pop)
var cpContextStack = new Stack<Context>();
cpContextStack = new Stack<Context>(state.ContextStack.Reverse());
return Path.TryEvaluate(cpContextStack, state, out context);
}
internal override bool TryEvaluate(Stack<Context> contextStack, CompilationState state, out Context context)
{
//Add the Identifier to the current context
var memberSymbol = contextStack.Any() ? contextStack.Peek().Symbol.FindMember(_value) :
state.Introspector.GetTypeSymbol(_value);
if (memberSymbol != null)
{
var identifierContext = new Context(string.Join(".", contextStack.Peek().FullPath, _value), memberSymbol);
if (_next == null)
{
//Last element => return IdentifierContext
context = identifierContext;
return true;
}
else
{
//Push the identifier on the contextStack and keep going
contextStack.Push(identifierContext);
return _next.TryEvaluate(contextStack, state, out context);
}
}
else
{
state.AddTypeError($"Could not find Member '{_value}' in Type '{contextStack.Peek().Symbol.ToDisplayString()}'!", HandlebarsTypeErrorKind.UnknownMember);
context = null;
return false;
}
}
internal override bool TryEvaluate(CompilationState state, out Context context)
{
var ctLoopContext = IsCompileTimeLoop(state);
if (ctLoopContext!=null)
{//Inside CTLoop -> Return literal
context = new Context(ctLoopContext.First.ToString().ToLower(), state.Introspector.GetBoolTypeSymbol());
return true;
} else
{
context = new Context($"first{state.LoopLevel}", state.Introspector.GetBoolTypeSymbol());
return InsideEachLoopCheck(state);
}
}
internal override bool TryEvaluate(CompilationState state, out Context context)
{
var ctLoopContext = IsCompileTimeLoop(state);
if (ctLoopContext!=null)
{
context = new Context($"\"{ctLoopContext.Key}\"", state.Introspector.GetStringTypeSymbol());
return true;
}
else
{
state.AddTypeError("KeyExpression outside a compiletime loop over an Object", HandlebarsTypeErrorKind.IllegalKeyExpression);
context = null;
return false;
}
}
internal abstract bool TryEvaluate(CompilationState state, out Context context);
internal override bool TryEvaluate(CompilationState state, out Context context)
{
context = new Context($"\"{_value}\"", state.Introspector.GetStringTypeSymbol());
return true;
}
internal abstract bool TryEvaluate(Stack<Context> contextStack, CompilationState state, out Context context);
internal override bool TryEvaluate(Stack<Context> contextStack, CompilationState state, out Context context)
{
if (_next == null)
{
context = contextStack.Peek();
return true;
}
else
return _next.TryEvaluate(contextStack, state, out context);
}
internal override bool TryEvaluate(Stack<Context> contextStack, CompilationState state, out Context context)
{
if (_next == null)
{
context = contextStack.Last();
return true;
}
else
{
var rootedContextStack = new Stack<Context>();
rootedContextStack.Push(contextStack.Last());
return _next.TryEvaluate(rootedContextStack, state, out context);
}
}
internal override bool TryEvaluate(Stack<Context> contextStack, CompilationState state, out Context context)
{
if (!contextStack.Any() || contextStack.Count == 1)
{
state.AddTypeError("Error in MemberExpression: Empty ContextStack but PathUp Element ('../')!", HandlebarsTypeErrorKind.EmptyContextStack);
context = null;
return false;
}
contextStack.Pop();
return _next.TryEvaluate(contextStack, state, out context);
}
/// <summary>
/// Returns a list of strings of the elements of a context which needs to be checked.
/// I.e. if the path in contextToCheck is "viewModel.Parent.Child" and the path in lastCheckedContext is
/// "viewModel" it will return { "viewModel.Parent", "viewModel.Parent.Child" }
/// Also unreachable code is detected
/// </summary>
/// <param name="lastCheckedContext"></param>
/// <param name="contextToCheck"></param>
/// <returns></returns>
private List<string> GetQueryElements(Context lastCheckedContext, Context contextToCheck)
{//Items -> ItemsTitle
var resultList = new List<string>();
var lastCheckedElements = lastCheckedContext?.FullPath.Split('.') ?? new string[0];
var pathToCheckElements = contextToCheck.FullPath.Split('.');
List<string> relevantElements = new List<string>();
List<string> prefixElements = new List<string>();
if (lastCheckedElements.Any())
{
int i = 0;
for (i = 0; i < Math.Min(lastCheckedElements.Length, pathToCheckElements.Length); i++)
{
if (lastCheckedElements[i].Equals(pathToCheckElements[i]))
prefixElements.Add(lastCheckedElements[i]);
else
break;
}
if (pathToCheckElements.Length > i)
relevantElements.AddRange(pathToCheckElements.Skip(i));
}
else
relevantElements = pathToCheckElements.ToList();
string prefix = prefixElements.Any() ? string.Join(".", prefixElements) + ".": string.Empty;
for (int i = 1; i <= relevantElements.Count; i++)
{//then join them back together with the prefix
resultList.Add(string.Concat(prefix, string.Join(".", relevantElements.Take(i).ToArray())));
}
return resultList;
}
internal void PromiseTruthyCheck(Context contextToCheck, IfType ifType = IfType.If)
{
contextToCheck.Truthy = ifType == IfType.If;
TruthyStack.Push(contextToCheck);
}