/// <summary>Reads a new operation from the given lexer.</summary>
/// <param name="sr">The lexer to read the operation from.</param>
/// <param name="parent">The fragment to parent the operation to.</param>
public OperationFragment(CodeLexer sr, CodeFragment parent)
{
ParentFragment = parent;
LineNumber = sr.LineNumber;
bool localMode = false;
while (true)
{
char peek = sr.Peek();
if (peek == StringReader.NULL)
{
return;
}
if (peek == ';' || peek == ',')
{
// Read it off:
sr.Read();
return;
}
Handler handler = Handlers.Find(peek);
if (handler == Handler.Stop)
{
return;
}
// Handle the fragment:
CodeFragment fragment;
try{
// Try to get the code fragment:
fragment = Handlers.Handle(handler, sr);
}catch (CompilationException e) {
if (e.LineNumber == -1)
{
// Setup line number:
e.LineNumber = LineNumber;
}
// Rethrow:
throw e;
}
if (localMode)
{
// Should always be a VariableFragment:
if (fragment.GetType() == typeof(VariableFragment))
{
VariableFragment local = (VariableFragment)fragment;
local.AfterVar = true;
}
localMode = false;
}
// Try adding the fragment to the operation:
AddResult status = fragment.AddTo(this, sr);
// What was the outcome?
switch (status)
{
case AddResult.Stop:
// Halt.
return;
case AddResult.Local:
// Local next:
localMode = true;
break;
// Ok otherwise.
}
}
}