public Statement DecompileConditionalJump(bool isOpt = false) // TODO: guess for loop, probably requires a large restructure
{
PopByte();
var scopeStartOffset = StartPositions.Pop();
Statement statement = null;
bool hasElse = false;
var scopeStatements = new List <Statement>();
UInt16 scopeEndJmpOffset = 0;
UInt16 afterScopeOffset = 0;
Expression conditional = null;
if (isOpt)
{
var obj = ReadObject();
var optCheck = Convert.ToBoolean(ReadByte());
afterScopeOffset = ReadUInt16();
String special = (optCheck ? "" : "!") + obj.ObjectName;
conditional = new SymbolReference(null, null, null, special);
}
else
{
afterScopeOffset = ReadUInt16();
conditional = DecompileExpression();
}
if (conditional == null)
{
return(null);
}
if (afterScopeOffset < scopeStartOffset) // end of do_until detection
{
scopeStartOffset = afterScopeOffset;
var outerScope = Scopes[CurrentScope.Peek()];
var startStatement = StatementLocations[afterScopeOffset];
StatementLocations.Remove(afterScopeOffset);
var index = outerScope.IndexOf(startStatement);
scopeStatements = new List <Statement>(outerScope.Skip(index));
outerScope.RemoveRange(index, outerScope.Count - index);
statement = new DoUntilLoop(conditional, new CodeBody(scopeStatements, null, null), null, null);
}
Scopes.Add(scopeStatements);
CurrentScope.Push(Scopes.Count - 1);
while (Position < afterScopeOffset)
{
if (CurrentIs(StandardByteCodes.Jump))
{
var contPos = (UInt16)Position;
PopByte();
scopeEndJmpOffset = ReadUInt16();
if (scopeEndJmpOffset == scopeStartOffset)
{
statement = new WhileLoop(conditional, new CodeBody(scopeStatements, null, null), null, null);
break;
}
else if (Position < afterScopeOffset) // if we are not at the end of the scope, this is a continue statement in a loop rather than an else statement
{
var cont = new ContinueStatement(null, null);
StatementLocations.Add(contPos, cont);
scopeStatements.Add(cont);
}
else if (ForEachScopes.Count != 0 && scopeEndJmpOffset == ForEachScopes.Peek())
{
var breakStatement = new BreakStatement(null, null);
StatementLocations.Add(contPos, breakStatement);
scopeStatements.Add(breakStatement);
}
else
{
hasElse = true;
}
continue;
}
var current = DecompileStatement();
if (current == null)
{
return(null); // ERROR ?
}
scopeStatements.Add(current);
}
CurrentScope.Pop();
List <Statement> elseStatements = new List <Statement>();
if (hasElse)
{
var endElseOffset = scopeEndJmpOffset;
Scopes.Add(elseStatements);
CurrentScope.Push(Scopes.Count - 1);
while (Position < endElseOffset)
{
var current = DecompileStatement();
if (current == null)
{
return(null); // ERROR ?
}
elseStatements.Add(current);
}
CurrentScope.Pop();
}
statement = statement ?? new IfStatement(conditional, new CodeBody(scopeStatements, null, null),
null, null, elseStatements.Count != 0 ? new CodeBody(elseStatements, null, null) : null);
StatementLocations.Add(scopeStartOffset, statement);
return(statement);
}
