/// <summary>
/// Executes a single line of code
/// </summary>
/// <param name="codeLine"></param>
/// <returns></returns>
public TFunctionData Execute(Line codeLine)
{
TFunctionData data = new TFunctionData(this);
Execute(data, codeLine);
return(data);
}
private void HandleError(Line current, TFunctionData stackFrame, Exception ex)
{
TbasicException cEx = ex as TbasicException;
if (cEx != null)
{
int status = cEx.Status;
string msg = stackFrame.Data as string;
if (string.IsNullOrEmpty(msg))
{
msg = cEx.Message;
}
stackFrame.Status = status;
stackFrame.Data = msg;
stackFrame.Context.SetReturns(stackFrame);
if (ThrowError)
{
throw new LineException(current.LineNumber, current.VisibleName, cEx);
}
}
else
{
throw new LineException(current.LineNumber, current.VisibleName, ex);
}
}
internal TFunctionData Execute(LineCollection lines)
{
TFunctionData stackFrame = new TFunctionData(this);
for (int index = 0; index < lines.Count; index++)
{
if (BreakRequest)
{
break;
}
Line current = lines[index];
CurrentLine = current.LineNumber;
try {
ObjectContext blockContext = Context.FindBlockContext(current.Name);
if (blockContext == null)
{
Execute(stackFrame, current);
}
else
{
CodeBlock block = blockContext.GetBlock(current.Name).Invoke(index, lines);
Context = Context.CreateSubContext();
block.Execute(this);
Context = Context.Collect();
index += block.Length - 1; // skip the length of the executed block
}
}
catch (Exception ex) {
HandleError(current, stackFrame, ex);
}
}
return(stackFrame);
}
private object ExecuteFunction(StringSegment _name, IList <object> l_params)
{
string name = _name.Trim().ToString();
object[] a_evaluated = null;
if (l_params != null)
{
a_evaluated = new object[l_params.Count];
l_params.CopyTo(a_evaluated, 0);
for (int i = 0; i < a_evaluated.Length; ++i)
{
IEvaluator expr = a_evaluated[i] as IEvaluator;
if (expr != null)
{
a_evaluated[i] = expr.Evaluate();
}
}
}
ObjectContext context = CurrentContext.FindFunctionContext(name);
if (context == null)
{
throw ThrowHelper.UndefinedFunction(name);
}
else
{
TFunctionData _sframe = new TFunctionData(CurrentExecution);
_sframe.SetAll(a_evaluated);
_sframe.Name = name;
context.GetFunction(name).Invoke(_sframe);
CurrentContext.SetReturns(_sframe);
return(_sframe.Data);
}
}
internal void SetReturns(TFunctionData _sframe)
{
SetVariable("@lasterror", _sframe.Status);
SetVariable("@lasterr", _sframe.Status);
SetVariable("@err", _sframe.Status);
SetVariable("@error", _sframe.Status);
}
internal void PersistReturns(TFunctionData _sframe)
{
ObjectContext context = FindVariableContext("@error");
if (context != null)
{
_sframe.Status = (int)context.GetVariable("@error");
}
}
/// <summary>
/// Copies all properties of another StackFrame into this one
/// </summary>
/// <param name="other"></param>
public void CopyFrom(TFunctionData other)
{
TFunctionData clone = other.Clone();
StackExecuter = clone.StackExecuter;
Text = clone.Text;
_params = clone._params;
Status = clone.Status;
Data = clone.Data;
}
/// <summary>
/// Clones this StackFrame
/// </summary>
/// <returns>A new StackFrame object with the same data</returns>
public TFunctionData Clone()
{
TFunctionData clone = new TFunctionData(StackExecuter);
clone.Text = Text;
if (_params == null)
{
clone._params = new List <object>();
}
else
{
clone._params.AddRange(_params);
}
clone.Status = Status;
clone.Data = Data;
return(clone);
}
internal static void Execute(TFunctionData stackFrame, Line codeLine)
{
ObjectContext context = stackFrame.Context.FindCommandContext(codeLine.Name);
if (context == null)
{
Evaluator eval = new Evaluator(new StringSegment(codeLine.Text), stackFrame.StackExecuter);
object result = eval.Evaluate();
stackFrame.Context.PersistReturns(stackFrame);
stackFrame.Data = result;
}
else if (codeLine.IsFunction)
{
throw ThrowHelper.ExpectedSpaceAfterCommand();
}
else
{
stackFrame.SetAll(codeLine.Text);
context.GetCommand(codeLine.Name).Invoke(stackFrame);
}
stackFrame.Context.SetReturns(stackFrame);
}