public bool VisitNode(BreakStatement node)
{
throw new NotImplementedException();
}
public bool VisitNode(BreakStatement node)
{
// break;
Write("break");
return true;
}
// TODO: guess for loop, probably requires a large restructure
public Statement DecompileConditionalJump(bool isOpt = false)
{
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;
}
public SwitchStatement DecompileSwitch()
{
PopByte();
var objIndex = ReadObject();
var unknByte = ReadByte();
var expr = DecompileExpression();
var scopeStatements = new List<Statement>();
UInt16 endOffset = 0xFFFF; // set it at max to begin with, so we can begin looping
Scopes.Add(scopeStatements);
CurrentScope.Push(Scopes.Count - 1);
while (Position < endOffset && Position < Size)
{
if (CurrentIs(StandardByteCodes.Jump)) // break detected, save the endOffset
{ // executes for all occurences, to handle them all.
StartPositions.Push((UInt16)Position);
PopByte();
endOffset = ReadUInt16();
var breakStatement = new BreakStatement(null, null);
StatementLocations.Add(StartPositions.Pop(), breakStatement);
scopeStatements.Add(breakStatement);
continue;
}
var current = DecompileStatement();
if (current == null)
return null; // ERROR ?
scopeStatements.Add(current);
if (current is DefaultStatement && endOffset == 0xFFFF)
break; // If no break was detected, we end the switch rather than include the rest of ALL code in the default.
}
CurrentScope.Pop();
var statement = new SwitchStatement(expr, new CodeBody(scopeStatements, null, null), null, null);
StatementLocations.Add(StartPositions.Pop(), statement);
return statement;
}
public Statement DecompileJump()
{
PopByte();
var jumpOffs = ReadUInt16(); // discard jump destination
Statement statement = null;
if (ForEachScopes.Count != 0 && jumpOffs == ForEachScopes.Peek()) // A jump to the IteratorPop of a ForEach means break afaik.
statement = new BreakStatement(null, null);
else
statement = new ContinueStatement(null, null);
StatementLocations.Add(StartPositions.Pop(), statement);
return statement;
}
public Statement DecompileIteratorPop()
{
PopByte();
if (CurrentIs(StandardByteCodes.Return)) // Any return inside a ForEach seems to call IteratorPop before the return, maybe breaks the loop?
{
return DecompileReturn();
}
else
{
var statement = new BreakStatement(null, null);
StatementLocations.Add(StartPositions.Pop(), statement);
return statement;
}
}
