/// <summary>
/// Replaces the goto statement with its target, if the target is goto statement.
/// </summary>
/// <param name="labeledStatement"></param>
/// <param name="gotoStatement"></param>
/// <returns></returns>
private bool TryRemoveChainedGoto(Statement labeledStatement, GotoStatement gotoStatement)
{
if (!(labeledStatement is GotoStatement))
{
return false;
}
BlockStatement parent = gotoStatement.Parent as BlockStatement;
int index = parent.Statements.IndexOf(gotoStatement);
/// Clone of labeled statement needed here
Statement clone = labeledStatement.CloneStatementOnly();
clone.Label = string.Empty;
parent.Statements.RemoveAt(index);
parent.AddStatementAt(index, clone);
methodContext.GotoStatements.Remove(gotoStatement);
methodContext.GotoStatements.Add(clone as GotoStatement);
if (!Targeted(labeledStatement.Label))
{
UpdateUntargetedStatement(labeledStatement, new Statement[] { labeledStatement });
}
return true;
}
/// <summary>
/// Coppies the block that is targeted from the goto if it matches the case
///
/// ... some code
/// goto: label0;
///
/// ...
/// ...
/// label0: statement1
/// *statements*
/// return;
/// ...
/// </summary>
/// <param name="labeledStatement">The targeted statement.</param>
/// <param name="gotoStatement">The goto statement.</param>
/// <returns>Returns True if the targeted block was coppied.</returns>
private bool TryCopyTargetedBlock(Statement labeledStatement, GotoStatement gotoStatement)
{
StatementCollection toCopy = new StatementCollection();
StatementCollection originalStatements = new StatementCollection();
BlockStatement targetParent = labeledStatement.Parent as BlockStatement;
if (targetParent == null)
{
return false;
}
int targetIndex = targetParent.Statements.IndexOf(labeledStatement);
originalStatements.Add(labeledStatement);
Statement labeledClone = labeledStatement.CloneStatementOnly();
labeledClone.Label = string.Empty;
toCopy.Add(labeledClone);
int maxStatementsToCopy = MaximumStatementsToCopy;
if (ContainsLabel(labeledClone))
{
return false;
}
maxStatementsToCopy -= GetStatementsCount(labeledClone);
if (maxStatementsToCopy < 0)
{
return false;
}
if (!IsReturnStatement(labeledClone) && !IsThrowStatement(labeledClone))
{
///Collect all statements, until a return is reached.
int index;
for (index = targetIndex + 1; index < targetParent.Statements.Count; index++)
{
Statement nextStatement = targetParent.Statements[index];
if (ContainsLabel(nextStatement))
{
return false;
}
maxStatementsToCopy -= GetStatementsCount(nextStatement);
if (maxStatementsToCopy < 0)
{
return false;
}
originalStatements.Add(nextStatement);
Statement clone = nextStatement.CloneStatementOnly();
toCopy.Add(clone);
if (IsReturnStatement(nextStatement) || IsThrowStatement(nextStatement))
{
break;
}
}
if (index == targetParent.Statements.Count)
{
///all the statements were traversed and no 'return' statement was found
return false;
}
}
///Move the coppied statements on the place of the goto statement.
MoveStatements(gotoStatement, toCopy);
///Clean up the label from the targeted statement if possible, and remove the targeted statement if it cannot be reached anymore
if (!Targeted(labeledStatement.Label))
{
UpdateUntargetedStatement(labeledStatement, originalStatements);
}
return true;
}