private bool 过程首部()
{
if (Comiler.Peek().LexicalLabel == LexicalLabel.PL0_ProcedureSym)
{
Comiler.Read();
if (Comiler.Peek().LexicalLabel == LexicalLabel.PL0_ID)
{
string proce = Comiler.Read().GetString();
if (!Procedure.Contains(proce))
{
SignTree = SignTree.AddItem(proce);
Procedure.AddItem(proce, SignTree);
}
else
{
ThrowException("重复的段：" + proce, true);
}
}
else
{
ThrowException("标识符");
}
if (Comiler.Peek().LexicalLabel == LexicalLabel.PL0_Semicolon)
{
Comiler.Read();
}
else
{
ThrowException("';'");
}
return(true);
}
return(false);
}
public SyntaxAnalysisUnit(StreamWriter writer, IComiler comiler)
{
Writer = writer;
Comiler = comiler;
SignTree = new SignTree("Global", null, "0");
Procedure = new ProcedureTable(SignTree);
}
public static void GetPath(SignTree running, SignTree target, out string[] callback, out string[] callin)
{
Stack <string> stackr = new Stack <string>();
Stack <string> stackt = new Stack <string>();
ReadPath(running, stackr);
ReadPath(target, stackt);
string[] runs = stackr.ToArray();
string[] tars = stackt.ToArray();
int index = 0;
for (int i = 0; i < runs.Length && i < tars.Length; i++)
{
if (runs[i] == tars[i])
{
index = i;
}
else
{
break;
}
}
callback = new string[runs.Length - index];
for (int i = 0; i < callback.Length; i++)
{
callback[i] = runs[i + index];
}
callin = new string[tars.Length - index];
for (int i = 0; i < callin.Length; i++)
{
callin[i] = tars[i + index];
}
}
public SignTree GetItem(string[] name)
{
SignTree item = null;
if (null != name)
{
if (0 < name.Length)
{
for (int i = 0; i < Children.Count; i++)
{
if (Children[i].Name == name[0])
{
string[] temp = new string[name.Length - 1];
for (int j = 0; j < temp.Length; j++)
{
temp[j] = name[j + 1];
}
return(Children[i].GetItem(temp));
}
}
}
else
{
for (int i = 0; i < Children.Count; i++)
{
if (Children[i].Name == name[0])
{
return(Children[i]);
}
}
}
}
return(item);
}
public ProcedureTable(SignTree tree)
{
Items = new Dictionary <string, SignTree>()
{
{ tree.Name, tree }
};
}
public SignTree AddItem(string name)
{
int add = VarTable[VarTable.Count - 1].Value + 4;
SignTree item = new SignTree(name, this, "[" + InitiationAddress + "+" + add.ToString() + "]");
Children.Add(item);
return(item);
}
private static void ReadPath(SignTree tree, Stack <string> stack)
{
SignTree temp = tree;
while (null != temp)
{
stack.Push(temp.Name);
temp = temp.Father;
}
}
public SignTree(string name, SignTree father, string init_addr)
{
Name = name;
Father = father;
InitiationAddress = init_addr;
IfIdentifier = -1;
WhileIdentifier = -1;
Children = new List <SignTree>();
VarTable = new List <KeyValuePair <string, int> >();
ConstTable = new List <KeyValuePair <string, uint> >();
}
private void 过程说明部分()
{
while (过程首部())
{
分程序();
if (Comiler.Peek().LexicalLabel == LexicalLabel.PL0_Semicolon)
{
Comiler.Read();
}
else
{
ThrowException("';'");
}
WriteToFile("ret");
SignTree = SignTree.Father;
}
}
public void AddItem(string name, SignTree tree)
{
Items.Add(name, tree);
}
