// 引き算
private Result CalcMinus([NotNull] calcParser.Expr_additiveContext context)
{
var(lSuc, ltype, lValue) = Visit(context.lhs);
var(rSuc, rtype, rValue) = Visit(context.rhs);
if (!(lSuc && rSuc))
{
return(new Result(false, CalcRule.None, (int)ErrString.ErrID.ArgNG));
}
try
{
checked
{
if ((ltype == CalcRule.CalcInt) && (rtype == CalcRule.CalcInt))
{
return(new Result(true, CalcRule.CalcInt, GetValInt(ltype, lValue) - GetValInt(rtype, rValue)));
}
else if ((ltype == CalcRule.CalcString) && (rtype == CalcRule.CalcString))
{
string rStr = ((string)rValue);
string lStr = ((string)lValue);
// 元のながさチェック
var lLen = lStr.Length;
var retStr = lStr.Replace(rStr, "");
if (lLen == retStr.Length)
{
// 文字列の引き算に失敗
return(new Result(false, CalcRule.None, (int)ErrString.ErrID.CantMinusString));
}
else
{
// 文字列の引き算（空白Replace）に成功
return(new Result(true, CalcRule.CalcString, retStr));
}
}
else if ((ltype == CalcRule.CalcReal) && (rtype == CalcRule.CalcReal))
{
return(new Result(true, CalcRule.CalcReal, GetValFloat(ltype, lValue) - GetValFloat(rtype, rValue)));
}
else if (((ltype == CalcRule.CalcInt) && (rtype == CalcRule.CalcReal)) ||
((ltype == CalcRule.CalcReal) && (rtype == CalcRule.CalcInt)))
{
return(new Result(true, CalcRule.CalcReal, GetValFloat(ltype, lValue) - GetValFloat(rtype, rValue)));
}
else
{
return(new Result(false, CalcRule.None, (int)ErrString.ErrID.UnSupportCalcRule));
}
}
}
catch (OverflowException)
{
return(new Result(false, CalcRule.None, (int)ErrString.ErrID.OverFlow));
}
}
//＋、ーの計算
public override Result VisitExpr_additive([NotNull] calcParser.Expr_additiveContext context)
{
switch (context.op.Type)
{
// 足し算の計算
case calcParser.PLUS:
return(CalcAdd(context));
case calcParser.MINUS:
return(CalcMinus(context));
default:
Debug.Assert(false);
return(DefaultResult);
}
}
// 足し算
private Result CalcAdd([NotNull] calcParser.Expr_additiveContext context)
{
var(lSuc, ltype, lValue) = Visit(context.lhs);
var(rSuc, rtype, rValue) = Visit(context.rhs);
if (!(lSuc && rSuc))
{
return(new Result(false, CalcRule.None, (int)ErrString.ErrID.ArgNG));
}
try
{
checked
{
if ((ltype == CalcRule.CalcInt) && (rtype == CalcRule.CalcInt))
{
return(new Result(true, CalcRule.CalcInt, GetValInt(ltype, lValue) + GetValInt(rtype, rValue)));
}
else if ((ltype == CalcRule.CalcString) && (rtype == CalcRule.CalcString))
{
return(new Result(true, CalcRule.CalcString, (string)lValue + (string)rValue));
}
else if ((ltype == CalcRule.CalcReal) && (rtype == CalcRule.CalcReal))
{
return(new Result(true, CalcRule.CalcReal, GetValFloat(ltype, lValue) + GetValFloat(rtype, rValue)));
}
else if (((ltype == CalcRule.CalcInt) && (rtype == CalcRule.CalcReal)) ||
((ltype == CalcRule.CalcReal) && (rtype == CalcRule.CalcInt)))
{
return(new Result(true, CalcRule.CalcReal, GetValFloat(ltype, lValue) + GetValFloat(rtype, rValue)));
}
else
{
return(new Result(false, CalcRule.None, (int)ErrString.ErrID.UnSupportCalcRule));
}
}
}
catch (OverflowException)
{
return(new Result(false, CalcRule.None, (int)ErrString.ErrID.OverFlow));
}
}
/// <summary>
/// Visit a parse tree produced by the <c>expr_additive</c>
/// labeled alternative in <see cref="calcParser.expr"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitExpr_additive([NotNull] calcParser.Expr_additiveContext context)
{
return(VisitChildren(context));
}
