/// <summary>
/// Enter the given symbol information into the symbol table. If the given
/// symbol is already present at the current nest level, produce an error
/// message, but do NOT throw any exceptions from this method.
/// </summary>
public virtual void enter(string s, Attributes info)
{
SymbolTableEntry symbolTableEntry = RetrieveSymbol(s);
if (symbolTableEntry != null)
{
return; // error message; symbol is already in the current scope dont add it
}
else
{
SymbolTableEntry tableEntry = null;
if (symTable.ContainsKey(s))
{
List <SymbolTableEntry> existingSymbolTableEntryList = symTable[s];
if (existingSymbolTableEntryList != null)
{
tableEntry = AddSymbolTableEntry(s, info);
existingSymbolTableEntryList.Add(tableEntry);
}
}
else
{
List <SymbolTableEntry> newSymbolTableEntryList = new List <SymbolTableEntry>();
tableEntry = AddSymbolTableEntry(s, info);
newSymbolTableEntryList.Add(tableEntry);
symTable.Add(s, newSymbolTableEntryList);
}
List <SymbolTableEntry> currentScopeList = scopeDisplay[CurrentNestLevel];
if (!currentScopeList.Contains(tableEntry))
{
currentScopeList.Add(tableEntry);
}
}
}
public virtual SymbolTableEntry AddSymbolTableEntry(string name, Attributes attributes)
{
SymbolTableEntry symbolTableEntry = new SymbolTableEntry();
symbolTableEntry.NAME = name;
symbolTableEntry.TYPE = attributes;
symbolTableEntry.LEVEL = CurrentNestLevel;
return(symbolTableEntry);
}
private void DeleteSymTableEntry(SymbolTableEntry sym)
{
if (symTable.ContainsKey(sym.NAME))
{
List <SymbolTableEntry> symbolTableEntryList = symTable[sym.NAME];
foreach (var item in symbolTableEntryList)
{
if (item.LEVEL == sym.LEVEL)
{
if (symbolTableEntryList.Count() == 1)
{
symTable.Remove(sym.NAME);
}
else
{
symbolTableEntryList.Remove(item);
}
return;
}
}
}
}