private bool _return()
{
TokenTry();
bool is_value = _value();
if (!Accept(NakoTokenType.RETURN))
{
TokenBack();
return(false);
}
TokenFinally();
if (is_value)
{
NakoNodeLet node = new NakoNodeLet();
NakoNodeVariable sore = new NakoNodeVariable();
sore.varNo = (int)0;
sore.scope = NakoVariableScope.Global;
node.VarNode = sore;
NakoNodeLetValue valuenode = new NakoNodeLetValue();
while (calcStack.Count > 0)
{
valuenode.AddChild(calcStack.Shift());
}
node.ValueNode = (NakoNode)valuenode;
parentNode.AddChild(node);
}
parentNode.AddChild(new NakoNodeReturn());
tok.MoveNext();
return(true);
}
private void _let(NakoNodeLet node)
{
NakoNodeVariable varNode = node.VarNode;
NakoNode valueNode = node.ValueNode;
// 配列要素があるか確認
if (!varNode.useElement)
{
// + 要素なしの代入処理
// - 代入する値を書き込んで...
Write_r(valueNode);
// - セットする
NakoILCode st = new NakoILCode();
st.value = varNode.varNo;
st.type = (varNode.scope == NakoVariableScope.Global)
? NakoILType.ST_GLOBAL
: NakoILType.ST_LOCAL;
result.Add(st);
}
else // 配列要素があるとき
{
// + 配列への代入処理
// - 基本となる変数をセット
NakoILCode ldvar = new NakoILCode();
ldvar.value = varNode.varNo;
ldvar.type = (varNode.scope == NakoVariableScope.Global)
? NakoILType.LD_GLOBAL_REF
: NakoILType.LD_LOCAL_REF;
result.Add(ldvar);
// - アクセス要素をセット
int count = varNode.Children.Count;
for (int i = 0; i < count; i++)
{
NakoNode n = varNode.Children[i];
Write_r(n); // ノードの値
if (i < count - 1)
{
result.Add(new NakoILCode(NakoILType.LD_ELEM_REF)); // 要素
}
else
{
// 値ノード
Write_r(valueNode);
addNewILCode(NakoILType.ST_ELEM);
}
}
}
}
//> _let : _setVariable EQ _value
private bool _let()
{
TokenTry();
if (!_setVariable())
{
TokenBack();
return(false);
}
if (!Accept(NakoTokenType.EQ))
{
TokenBack();
return(false);
}
NakoNodeLet node = new NakoNodeLet();
node.VarNode = (NakoNodeVariable)lastNode; // _setVariable のノード
tok.MoveNext();
if (!_value())
{
throw new NakoParserException("代入文で値がありません。", tok.CurrentToken);
}
TokenFinally();
NakoNodeLetValue valuenode = new NakoNodeLetValue();
while (calcStack.Count > 0)
{
valuenode.AddChild(calcStack.Shift());
}
node.ValueNode = (NakoNode)valuenode;
parentNode.AddChild(node);
lastNode = node;
return(true);
}
//> _def_variable : WORD (DIM_VARIABLE|DIM_NUMBER|DIM_INT|DIM_STRING|DIM_ARRAY) [=_value]
//> ;
private bool _def_variable()
{
if (!Accept(NakoTokenType.WORD))
{
return(false);
}
NakoVarType st = NakoVarType.Object;
switch (tok.NextTokenType)
{
case NakoTokenType.DIM_VARIABLE:
st = NakoVarType.Object;
break;
case NakoTokenType.DIM_NUMBER:
st = NakoVarType.Double;
break;
case NakoTokenType.DIM_INT:
st = NakoVarType.Int;
break;
case NakoTokenType.DIM_STRING:
st = NakoVarType.String;
break;
case NakoTokenType.DIM_ARRAY:
st = NakoVarType.Array;
break;
default:
return(false);
}
NakoToken t = tok.CurrentToken;
int varNo = localVar.CreateVar(t.GetValueAsName());
NakoVariable v = localVar.GetVar(varNo);
v.SetBody(null, st);
tok.MoveNext(); // skip WORD
tok.MoveNext(); // skip DIM_xxx
// 変数の初期化があるか？
if (!Accept(NakoTokenType.EQ))
{
return(true); // なければ正常値として戻る
}
tok.MoveNext(); // skip EQ
if (!_value())
{
throw new NakoParserException("変数の初期化文でエラー。", t);
}
// 代入文を作る
NakoNodeLet let = new NakoNodeLet();
let.VarNode = new NakoNodeVariable();
let.VarNode.varNo = varNo;
let.VarNode.scope = NakoVariableScope.Local;
let.ValueNode.AddChild(calcStack.Pop());
this.parentNode.AddChild(let);
return(true);
}
