public override void VisitIfStatement (IfStatement node)
{
WriteKeyword ("if");
WriteSpace ();
WriteBetweenParenthesis (node.Condition);
WriteLine ();
Visit (node.Then);
if (node.Else == null)
return;
WriteKeyword ("else");
WriteLine ();
Visit (node.Else);
}
static bool IsEmptyThenCondition (IfStatement conditional)
{
return conditional.Then.Statements.Count == 0
&& conditional.Else != null
&& conditional.Else.Statements.Count > 0;
}
void SwapConditionBranches (IfStatement conditional)
{
conditional.Then = conditional.Else;
conditional.Else = null;
Push (conditional.Condition);
Negate ();
conditional.Condition = Pop ();
}
static bool IsElseUnecessary (IfStatement condition)
{
var then = condition.Then;
if (then.Statements.Count == 0)
return false;
var last = then.Statements [then.Statements.Count - 1];
return last is BreakStatement
|| last is ContinueStatement
|| last is ReturnStatement;
}
void ProcessConditionBranches (ConditionData data, IfStatement conditional)
{
MoveStatementsToBlock (data.Then, conditional.Then);
if (data.Else != null && !IsElseUnecessary (conditional)) {
conditional.Else = new BlockStatement ();
MoveStatementsToBlock (data.Else, conditional.Else);
if (IsEmptyThenCondition (conditional))
SwapConditionBranches (conditional);
}
}
void AddCompleteCondition (Instruction instruction)
{
Negate ();
var condition = new IfStatement (Pop (), new BlockStatement (), null);
ProcessConditionBranches (annotations.GetData<ConditionData> (instruction), condition);
Add (condition);
}
void AddBasicCondition (Instruction instruction, Instruction target)
{
var then = new BlockStatement ();
var condition = new IfStatement (Pop (), then, null);
then.Statements.Add (new GotoStatement (annotations.GetData<string> (instruction)));
Add (condition);
}
public virtual void VisitIfStatement (IfStatement node)
{
Visit (node.Condition);
Visit (node.Then);
Visit (node.Else);
}