private Syntax.Expression ParseBinaryOper(int level, Syntax.Expression lnode, bool stop_if_comma = false)
{
Syntax.Expression root = null;
while (true)
{
Syntax.Object.CheckObject(lnode);
if (scan.Peek().type == Token.Type.QUESTION)
{
scan.Read();
Syntax.Expression expr = ParseExpression();
CheckToken(scan.Peek(), Token.Type.COLON, true);
root = new Syntax.Ternary(lnode);
((Syntax.Ternary)root).SetBranchTrue(expr);
((Syntax.Ternary)root).SetBranchFalse(ParseExpression());
lnode = root;
}
int op_level = GetOperatorPriority(scan.Peek());
if (op_level < level || (stop_if_comma && scan.Peek().type == Token.Type.COMMA))
{
return(lnode);
}
if (this.parse_const_expr && op_level == 2)
{
throw new Syntax.Exception("недопустимый оператор в константном выражении", scan.GetPos(), scan.GetLine());
}
Token oper = scan.Read();
Syntax.Expression rnode = ParseUnaryExpr();
int level_next_oper = GetOperatorPriority(scan.Peek());
try
{
if (op_level < level_next_oper)
{
rnode = ParseBinaryOper(op_level + 1, rnode, stop_if_comma);
}
root = new Syntax.BinaryOperator(oper);
((Syntax.BinaryOperator)root).SetLeftOperand(lnode);
((Syntax.BinaryOperator)root).SetRightOperand(rnode);
}
catch (Syntax.Exception e)
{
ToHandlerException(e);
}
lnode = root;
}
}
private Syntax.Expression ParseBinaryOper(int level, Syntax.Expression lnode, bool stop_if_comma = false)
{
Syntax.Expression root = null;
while (true)
{
Syntax.Object.CheckObject(lnode);
if (scan.Peek().type == Token.Type.QUESTION)
{
scan.Read();
Syntax.Expression expr = ParseExpression();
CheckToken(scan.Peek(), Token.Type.COLON, true);
root = new Syntax.Ternary(lnode);
((Syntax.Ternary)root).SetBranchTrue(expr);
((Syntax.Ternary)root).SetBranchFalse(ParseExpression());
lnode = root;
}
int op_level = GetOperatorPriority(scan.Peek());
if (op_level < level || (stop_if_comma && scan.Peek().type == Token.Type.COMMA))
{
return lnode;
}
if (this.parse_const_expr && op_level == 2)
{
throw new Syntax.Exception("недопустимый оператор в константном выражении", scan.GetPos(), scan.GetLine());
}
Token oper = scan.Read();
Syntax.Expression rnode = ParseUnaryExpr();
int level_next_oper = GetOperatorPriority(scan.Peek());
try
{
if (op_level < level_next_oper)
{
rnode = ParseBinaryOper(op_level + 1, rnode, stop_if_comma);
}
root = new Syntax.BinaryOperator(oper);
((Syntax.BinaryOperator)root).SetLeftOperand(lnode);
((Syntax.BinaryOperator)root).SetRightOperand(rnode);
}
catch (Syntax.Exception e)
{
ToHandlerException(e);
}
lnode = root;
}
}