//生成语法树的一个节点
static ExprNode MakeExprNode(Common.Token_Type opcode, params Object[] exprNodes)
{
ExprNode ExprPtr = new ExprNode();
ExprPtr.OpCode = opcode;
switch (opcode)
{
case Common.Token_Type.CONST_ID:
ExprPtr.CaseConst = (double)exprNodes[0];
break;
case Common.Token_Type.T:
// ExprPtr.CaseParmPtr = double.Parse((string)exprNodes[0]);// can find &Parameter in C#
ExprPtr.CaseParmPtr = Common.Change;
break;
case Common.Token_Type.FUNC:
ExprPtr.MathFuncPtr = (Common.FuncPtr)exprNodes[0];
ExprPtr.Child = (ExprNode)exprNodes[1];
break;
default:
ExprPtr.Left = (ExprNode)exprNodes[0];
ExprPtr.Right = (ExprNode)exprNodes[1];
break;
}
return(ExprPtr);
}
public Token(Common.Token_Type type, string lexeme, double value, Common.FuncPtr func)
{
this.type = type;
this.lexeme = lexeme;
this.value = value;
this.func = func;
}
//匹配记号
static void MatchToken(Common.Token_Type The_Token)
{
if (token.type != The_Token)
{
// Console.Error.WriteLine("Error in MatchToken");
SyntaxError(2);
}
FetchToken();
}