private static CaseExpression reduceCaseExpression(WordCollection wc)
{
CaseExpression ret = new CaseExpression();
IdentifierWord id = wc.Current as IdentifierWord;
if ((id != null) && (id.Code.Equals("IS", Config.SCVariable)))
{
wc.ShiftNext();
ret.CaseType = CaseExpressionType.Is;
OperatorWord opWT = wc.Current as OperatorWord;
if (opWT == null)
{
throw new CodeEE("ISキーワードの後に演算子がありません");
}
OperatorCode op = opWT.Code;
if (!OperatorManager.IsBinary(op))
{
throw new CodeEE("ISキーワードの後の演算子が2項演算子ではありません");
}
wc.ShiftNext();
ret.Operator = op;
ret.LeftTerm = reduceTerm(wc, false, TermEndWith.Comma, VariableCode.__NULL__);
if (ret.LeftTerm == null)
{
throw new CodeEE("ISキーワードの後に式がありません");
}
Type type = ret.LeftTerm.GetOperandType();
return(ret);
}
ret.LeftTerm = reduceTerm(wc, true, TermEndWith.Comma, VariableCode.__NULL__);
if (ret.LeftTerm == null)
{
throw new CodeEE("CASEの引数は省略できません");
}
id = wc.Current as IdentifierWord;
if ((id != null) && (id.Code.Equals("TO", Config.SCVariable)))
{
ret.CaseType = CaseExpressionType.To;
wc.ShiftNext();
ret.RightTerm = reduceTerm(wc, true, TermEndWith.Comma, VariableCode.__NULL__);
if (ret.RightTerm == null)
{
throw new CodeEE("TOキーワードの後に式がありません");
}
id = wc.Current as IdentifierWord;
if ((id != null) && (id.Code.Equals("TO", Config.SCVariable)))
{
throw new CodeEE("TOキーワードが2度使われています");
}
if (ret.LeftTerm.GetOperandType() != ret.RightTerm.GetOperandType())
{
throw new CodeEE("TOキーワードの前後の型が一致していません");
}
return(ret);
}
ret.CaseType = CaseExpressionType.Normal;
return(ret);
}
public static IOperandTerm ReduceBinaryTerm(OperatorCode op, IOperandTerm left, IOperandTerm right)
{
OperatorMethod method = null;
if ((left.GetOperandType() == typeof(Int64)) && (right.GetOperandType() == typeof(Int64)))
{
if (binaryIntIntDic.ContainsKey(op))
{
method = binaryIntIntDic[op];
}
}
else if ((left.GetOperandType() == typeof(string)) && (right.GetOperandType() == typeof(string)))
{
if (binaryStrStrDic.ContainsKey(op))
{
method = binaryStrStrDic[op];
}
}
else if (((left.GetOperandType() == typeof(Int64)) && (right.GetOperandType() == typeof(string))) ||
((left.GetOperandType() == typeof(string)) && (right.GetOperandType() == typeof(Int64))))
{
if (op == OperatorCode.Mult)
{
method = binaryMultIntStr;
}
}
if (method != null)
{
return(new FunctionMethodTerm(method, new IOperandTerm[] { left, right }));
}
string errMes = "";
if (left.GetOperandType() == typeof(Int64))
{
errMes += "数値型と";
}
else if (left.GetOperandType() == typeof(string))
{
errMes += "文字列型と";
}
else
{
errMes += "不定型と";
}
if (right.GetOperandType() == typeof(Int64))
{
errMes += "数値型の";
}
else if (right.GetOperandType() == typeof(string))
{
errMes += "文字列型の";
}
else
{
errMes += "不定型の";
}
errMes += "演算に二項演算子\'" + OperatorManager.ToOperatorString(op) + "\'は適用できません";
throw new CodeEE(errMes);
}
private int lastPriority()
{
if (stack.Count < 3)
{
return(-1);
}
object temp = (object)stack.Pop();
OperatorCode opCode = (OperatorCode)stack.Peek();
int priority = OperatorManager.GetPriority(opCode);
stack.Push(temp);
return(priority);
}
private int lastPriority()
{
if (stack.Count < 3)
{
return(-1);
}
var temp = stack.Pop();
var opCode = (OperatorCode)stack.Peek();
var priority = OperatorManager.GetPriority(opCode);
stack.Push(temp);
return(priority);
}
public static IOperandTerm ReduceUnaryTerm(OperatorCode op, IOperandTerm o1)
{
OperatorMethod method = null;
if (op == OperatorCode.Increment || op == OperatorCode.Decrement)
{
VariableTerm var = o1 as VariableTerm;
if (var == null)
{
throw new CodeEE("変数以外をインクリメントすることはできません");
}
if (var.Identifier.IsConst)
{
throw new CodeEE("変更できない変数をインクリメントすることはできません");
}
}
if (o1.GetOperandType() == typeof(Int64))
{
if (op == OperatorCode.Plus)
{
return(o1);
}
OperatorMethod operator_method = null;
if (unaryDic.TryGetValue(op, out operator_method))
{
method = operator_method;
}
}
if (method != null)
{
return(new FunctionMethodTerm(method, new IOperandTerm[] { o1 }));
}
string errMes = "";
if (o1.GetOperandType() == typeof(Int64))
{
errMes += "数値型";
}
else if (o1.GetOperandType() == typeof(string))
{
errMes += "文字列型";
}
else
{
errMes += "不定型";
}
errMes += "に単項演算子\'" + OperatorManager.ToOperatorString(op) + "\'は適用できません";
throw new CodeEE(errMes);
}
public static IOperandTerm ReduceUnaryAfterTerm(OperatorCode op, IOperandTerm o1)
{
OperatorMethod method = null;
if (op == OperatorCode.Increment || op == OperatorCode.Decrement)
{
var var = o1 as VariableTerm;
if (var == null)
{
throw new CodeEE("変数以外をインクリメントすることはできません");
}
if (var.Identifier.IsConst)
{
throw new CodeEE("変更できない変数をインクリメントすることはできません");
}
}
if (o1.GetOperandType() == typeof(long))
{
if (unaryAfterDic.ContainsKey(op))
{
method = unaryAfterDic[op];
}
}
if (method != null)
{
return(new FunctionMethodTerm(method, new[] { o1 }));
}
var errMes = "";
if (o1.GetOperandType() == typeof(long))
{
errMes += "数値型";
}
else if (o1.GetOperandType() == typeof(string))
{
errMes += "文字列型";
}
else
{
errMes += "不定型";
}
errMes += "に後置単項演算子\'" + OperatorManager.ToOperatorString(op) + "\'は適用できません";
throw new CodeEE(errMes);
}
private void reduceLastThree()
{
//if (stack.Count < 2)
// throw new ExeEE("不正な時期の呼び出し");
IOperandTerm right = (IOperandTerm)stack.Pop();//後から入れたほうが右側
OperatorCode op = (OperatorCode)stack.Pop();
IOperandTerm left = (IOperandTerm)stack.Pop();
if (OperatorManager.IsTernary(op))
{
if (stack.Count > 1)
{
reduceTernary(left, right, op);
return;
}
throw new CodeEE("式の数が不足しています");
}
IOperandTerm newTerm = OperatorMethodManager.ReduceBinaryTerm(op, left, right);
stack.Push(newTerm);
}
public void Add(OperatorCode op)
{
if (state == 2 || state == 3)
{
throw new CodeEE("式が異常です");
}
if (state == 0)
{
if (!OperatorManager.IsUnary(op))
{
throw new CodeEE("式が異常です");
}
stack.Push(op);
if (op == OperatorCode.Plus || op == OperatorCode.Minus || op == OperatorCode.BitNot)
{
state = 2;
}
else
{
state = 3;
}
return;
}
if (state == 1)
{
//後置単項演算子の場合は特殊処理へ
if (OperatorManager.IsUnaryAfter(op))
{
if (hasAfter)
{
hasAfter = false;
throw new CodeEE("後置の単項演算子が複数存在しています");
}
if (hasBefore)
{
hasBefore = false;
throw new CodeEE("インクリメント・デクリメントを前置・後置両方同時に使うことはできません");
}
stack.Push(op);
reduceUnaryAfter();
//前置単項演算子が処理を待っている場合はここで解決
if (waitAfter)
{
reduceUnary();
}
hasBefore = false;
hasAfter = true;
waitAfter = false;
return;
}
if (!OperatorManager.IsBinary(op) && !OperatorManager.IsTernary(op))
{
throw new CodeEE("式が異常です");
}
//先に未解決の前置演算子解決
if (waitAfter)
{
reduceUnary();
}
int priority = OperatorManager.GetPriority(op);
//直前の計算の優先度が同じか高いなら還元。
while (lastPriority() >= priority)
{
this.reduceLastThree();
}
stack.Push(op);
state = 0;
waitAfter = false;
hasBefore = false;
hasAfter = false;
return;
}
throw new CodeEE("式が異常です");
}
