Expr HandleLet()
{
var multi = new List <Expr>();
do
{
string name = _parser.ReadIdentifier();
if (name == null)
{
return(new SyntaxErrorExpr(_parser.Location, "Expected identifier (variable name)."));
}
Expr e = _scope.Declare(name, new AccessorLetExpr(_parser.PrevNonCommentLocation, name));
if (_parser.Match(JSTokenizerToken.Assign))
{
e = HandleAssign(e, true);
}
multi.Add(e);
if (e is SyntaxErrorExpr)
{
break;
}
}while(_parser.Match(JSTokenizerToken.Comma));
if (multi.Count == 1)
{
return(multi[0]);
}
return(new ListOfExpr(multi));
}
Expr HandleLet()
{
List <AccessorLetExpr> decl = null;
List <Expr> multi = null;
for ( ;;)
{
string name = _parser.ReadIdentifier();
if (name == null)
{
return(new SyntaxErrorExpr(_parser.Location, "Expected identifier (variable name)."));
}
var v = new AccessorLetExpr(_parser.PrevNonCommentLocation, name);
Expr e = _parser.IsAssignOperator
? HandleAssign(v, _scope.Find(name), name)
: v;
Debug.Assert(!(e is SyntaxErrorExpr));
if (_parser.Match(TokenizerToken.Comma))
{
if (multi == null)
{
multi = new List <Expr>();
decl = new List <AccessorLetExpr>();
}
multi.Add(e);
decl.Add(v);
}
else
{
Expr reg = _scope.Declare(v);
if (reg is SyntaxErrorExpr)
{
return(reg);
}
if (multi == null)
{
return(e);
}
foreach (var var in decl)
{
reg = _scope.Declare(var);
if (reg is SyntaxErrorExpr)
{
return(reg);
}
}
multi.Add(e);
return(new ListOfExpr(multi));
}
}
}
