/// <summary>
/// 构造函数
/// </summary>
public PL0Compiler(string path)
{
try
{
source = new FileStream(path, FileMode.Open);
SA = new SymbolAnalysis(this);
ST = new SymbolTable(this);
EH = new ErrorHandle(this);
GSA = new GrammarAndSemanticAna(this);
PCG = new PCodeGenetate();
}
catch (IOException e)
{
Console.WriteLine(e.Message);
source = null;
SA = null;
ST = null;
EH = null;
GSA = null;
PCG = null;
}
finally
{
}
}
/// <summary>
/// 字符表登录函数
/// </summary>
/// <param name="K">类型</param>
public void Enter(ObjectK K)
{
GrammarAndSemanticAna GS = compiler.GSA;
if (GS.getLevel() > lev)
{
lev++;
tx[lev] = tx[lev - 1];
}
else if (GS.getLevel() < lev)
{
lev--;
}
tx[lev]++;
SymTabItem item = new SymTabItem();
item.kind = K;
item.name = compiler.SA.tname;
switch (K)
{
case ObjectK.constant:
item.value = compiler.SA.tnumber;
SymTable.Add(item);
break;
case ObjectK.variable:
item.level = compiler.GSA.getLevel();
item.address = compiler.GSA.getAddress();
SymTable.Add(item);
break;
case ObjectK.procedure:
item.level = compiler.GSA.getLevel();
SymTable.Add(item);
break;
}
}
