public SymbolTable()
{
Level++;
var symbolList = new SymbolList();
symbolTable.AddLast(symbolList);
Current = symbolTable.Last;
}
private void InterpretDecVariable(TreeNode node, int type, SymbolList table)
{
var variable = node;
if (variable.MiddleNode == null)
{
string value = null;
if (variable.RightNode != null)
{
value = InterpretExp(variable.RightNode.MiddleNode);
}
if (type == TokenType.Int)
{
Codes.AddLast(new Quadruple(InstructionType.Int, value, null, variable.LeftNode.Value, Line));
Line++;
var symbol = new Symbol(variable.LeftNode.Value, SymbolType.IntValue, Level);
SymbolTable.Register(symbol);
}
else if (type == TokenType.Real)
{
Codes.AddLast(new Quadruple(InstructionType.Real, value, null, variable.LeftNode.Value, Line));
Line++;
var symbol = new Symbol(variable.LeftNode.Value, SymbolType.RealValue, Level);
SymbolTable.Register(symbol);
}
else if (type == TokenType.Char)
{
Codes.AddLast(new Quadruple(InstructionType.Char, value, null, variable.LeftNode.Value, Line));
Line++;
var symbol = new Symbol(variable.LeftNode.Value, SymbolType.CharValue, Level);
SymbolTable.Register(symbol);
}
}
else if (variable.MiddleNode != null) //数组暂时不能初始化
{
if (variable.RightNode != null)
{
throw new InterpretException("ERROR : 初始化非法.\n");
}
var len = InterpretArrayDim(variable.MiddleNode, out var dim);
if (type == TokenType.Int)
{
Codes.AddLast(new Quadruple(InstructionType.Int, dim.ToString(), len, variable.LeftNode.Value, Line));
Line++;
var symbol = new Symbol(variable.LeftNode.Value, SymbolType.IntArray, Level);
SymbolTable.Register(symbol);
}
else if (type == TokenType.Real)
{
Codes.AddLast(new Quadruple(InstructionType.Real, dim.ToString(), len, variable.LeftNode.Value, Line));
Line++;
var symbol = new Symbol(variable.LeftNode.Value, SymbolType.RealArray, Level);
SymbolTable.Register(symbol);
}
else if (type == TokenType.Char)
{
Codes.AddLast(new Quadruple(InstructionType.Char, dim.ToString(), len, variable.LeftNode.Value, Line));
Line++;
var symbol = new Symbol(variable.LeftNode.Value, SymbolType.CharArray, Level);
SymbolTable.Register(symbol);
}
}
}