/// <summary>
/// Creates a new symbol or gives a reference to a symbol that is
/// determined by the type of the symbol record in the file content.
/// </summary>
/// <param name="symbolRecord"></param>
/// <returns></returns>
static public Symbol CreateSymbol(SymbolRecord symbolRecord)
{
Symbol symbol;
switch (symbolRecord.Kind)
{
case 0:
symbol = new SymbolNonterminal(symbolRecord.Index, symbolRecord.Name);
break;
case 1:
symbol = new SymbolTerminal(symbolRecord.Index, symbolRecord.Name);
break;
case 2:
symbol = new SymbolWhiteSpace(symbolRecord.Index);
break;
case 3:
symbol = SymbolCollection.EOF;
break;
case 4:
symbol = new SymbolCommentStart(symbolRecord.Index);
break;
case 5:
symbol = new SymbolCommentEnd(symbolRecord.Index);
break;
case 6:
symbol = new SymbolCommentLine(symbolRecord.Index);
break;
case 7:
symbol = SymbolCollection.ERROR;
break;
default:
// this sort of symbol should never be here
symbol = new SymbolError(-1);
break;
}
return(symbol);
}
private RuleCollection CreateRules(CGTContent content)
{
RuleCollection rules = new RuleCollection();
foreach (RuleRecord ruleRecord in content.RuleTable)
{
SymbolNonterminal lhs = symbols[ruleRecord.Nonterminal] as SymbolNonterminal;
//todo: exception handling?
Symbol[] rhs = new Symbol[ruleRecord.Symbols.Count];
for (int i = 0; i< rhs.Length; i++)
{
rhs[i] = symbols[ruleRecord.Symbols[i]];
}
Rule rule = new Rule(ruleRecord.Index,lhs,rhs);
rules.Add(rule);
}
return rules;
}
/// <summary>
/// Creates a new rule.
/// </summary>
/// <param name="id">Id of this rule.</param>
/// <param name="lhs">Left hand side. The other symbols can be reduced to
/// this symbol.</param>
/// <param name="rhs">The right hand side. The symbols that can be reduced.</param>
public Rule(int id, SymbolNonterminal lhs, Symbol[] rhs)
{
this.id = id;
this.lhs = lhs;
this.rhs = rhs;
}
public GotoEventArgs(SymbolNonterminal symbol, State newState)
{
this.symbol = symbol;
this.newState = newState;
}