/// <summary>
/// return value;
/// </summary>
/// <returns></returns>
public override Expr Parse()
{
var stmt = new ReturnExpr();
_tokenIt.Expect(Tokens.Return);
if (_tokenIt.IsEndOfStmtOrBlock())
return stmt;
var exp = _parser.ParseExpression(Terminators.ExpStatementEnd, passNewLine: false);
stmt.Exp = exp;
return stmt;
}
/// <summary>
/// Visits the try statement tree.
/// </summary>
/// <param name="tryExpr"></param>
public object VisitReturn(ReturnExpr expr)
{
_callBackOnNodeStart(expr);
return null;
}
/// <summary>
/// Execute the statement.
/// </summary>
public object VisitReturn(ReturnExpr expr)
{
var parent = expr.FindParent<FunctionExpr>();
if (parent == null) throw new LangException("syntax error", "unable to return, parent not found", string.Empty, 0);
object result = expr.Exp == null ? LObjects.Null : expr.Exp.Evaluate(this);
bool hasReturnVal = expr.Exp != null;
parent.HasReturnValue = hasReturnVal;
parent.ReturnValue = result;
parent.ContinueRunning = false;
return LObjects.Null;
}
public Expr OnParseReturn()
{
var tokenIt = this._parser.TokenIt;
var initiatorToken = tokenIt.NextToken;
var expr = new ReturnExpr();
// <codeReturn>
tokenIt.Expect(Tokens.Return);
if (tokenIt.IsEndOfStmtOrBlock())
return expr;
var exp = this._parser.ParseExpression(Terminators.ExpStatementEnd, passNewLine: false);
expr.Exp = exp;
// </codeReturn>
this._parser.SetupContext(expr, initiatorToken);
return expr;
}