/// <summary>
/// http://www.ecma-international.org/ecma-262/5.1/#sec-12.6.3
/// </summary>
/// <param name="forStatement"></param>
/// <returns></returns>
public Completion ExecuteForStatement(ForStatement forStatement)
{
if (forStatement.Init != null)
{
if (forStatement.Init.Type == SyntaxNodes.VariableDeclaration)
{
ExecuteStatement(forStatement.Init.As<Statement>());
}
else
{
_engine.GetValue(_engine.EvaluateExpression(forStatement.Init.As<Expression>()));
}
}
JsValue v = Undefined.Instance;
while (true)
{
if (forStatement.Test != null)
{
var testExprRef = _engine.EvaluateExpression(forStatement.Test);
if (!TypeConverter.ToBoolean(_engine.GetValue(testExprRef)))
{
return new Completion(Completion.Normal, v, null);
}
}
var stmt = ExecuteStatement(forStatement.Body);
if (stmt.Value != null)
{
v = stmt.Value;
}
if (stmt.Type == Completion.Break && (stmt.Identifier == null || stmt.Identifier == forStatement.LabelSet))
{
return new Completion(Completion.Normal, v, null);
}
if (stmt.Type != Completion.Continue || ((stmt.Identifier != null) && stmt.Identifier != forStatement.LabelSet))
{
if (stmt.Type != Completion.Normal)
{
return stmt;
}
}
if (forStatement.Update != null)
{
var incExprRef = _engine.EvaluateExpression(forStatement.Update);
_engine.GetValue(incExprRef);
}
}
}
private void EmitForStatement(ForStatement s)
{
_noeolstmt = true;
Write("for(");
Emit(s.Init);
if (!(s.Init is Statement)) { Write("; "); } else Write(" ");
Emit(s.Test);
Write("; ");
Emit(s.Update);
Write(")");
_noeolstmt = false;
Emit(s.Body);
}
