public LR0Item(int id, Production production, int position, GrammarHintList hints)
{
ID = id;
Production = production;
Position = position;
Hints = hints;
_hashCode = ID.ToString().GetHashCode();
}
public LR0Item(int id, Production production, int position, GrammarHintList hints)
{
ID = id;
Production = production;
Position = position;
Current = (Position < Production.RValues.Count) ? Production.RValues[Position] : null;
if (hints != null)
{
Hints.AddRange(hints);
}
_hashCode = ID.ToString().GetHashCode();
}//method
private Production CreateProduction(NonTerminal lvalue, BnfTermList operands)
{
Production prod = new Production(lvalue);
GrammarHintList hints = null;
//create RValues list skipping Empty terminal and collecting grammar hints
foreach (BnfTerm operand in operands)
{
if (operand == Grammar.CurrentGrammar.Empty)
{
continue;
}
//Collect hints as we go - they will be added to the next non-hint element
GrammarHint hint = operand as GrammarHint;
if (hint != null)
{
if (hints == null)
{
hints = new GrammarHintList();
}
hints.Add(hint);
continue;
}
//Check if it is a Terminal or Error element
Terminal t = operand as Terminal;
if (t != null)
{
prod.Flags |= ProductionFlags.HasTerminals;
if (t.Category == TokenCategory.Error)
{
prod.Flags |= ProductionFlags.IsError;
}
}
//Add the operand info and LR0 Item
LR0Item item = new LR0Item(_lastItemId++, prod, prod.RValues.Count, hints);
prod.LR0Items.Add(item);
prod.RValues.Add(operand);
hints = null;
}//foreach operand
//set the flags
if (prod.RValues.Count == 0)
{
prod.Flags |= ProductionFlags.IsEmpty;
}
//Add final LRItem
prod.LR0Items.Add(new LR0Item(_lastItemId++, prod, prod.RValues.Count, hints));
return(prod);
}
public GrammarHintList GetHints(HintType hintType)
{
var result = new GrammarHintList();
foreach (var item in this)
{
if (item.Core.HasHints())
{
foreach (var hint in item.Core.Hints)
{
if (hint.HintType == hintType)
{
result.Add(hint);
}
}
}
}
return(result);
}
private Production CreateProduction(NonTerminal lvalue, BnfTermList operands)
{
Production prod = new Production(lvalue);
GrammarHintList hints = null;
//create RValues list skipping Empty terminal and collecting grammar hints
foreach (BnfTerm operand in operands)
{
if (operand == _grammar.Empty)
{
continue;
}
//Collect hints as we go - they will be added to the next non-hint element
GrammarHint hint = operand as GrammarHint;
if (hint != null)
{
if (hints == null)
{
hints = new GrammarHintList();
}
hints.Add(hint);
continue;
}
//Add the operand and create LR0 Item
prod.RValues.Add(operand);
prod.LR0Items.Add(new LR0Item(_lastItemId++, prod, prod.RValues.Count - 1, hints));
hints = null;
}//foreach operand
//set the flags
if (prod.RValues.Count == 0)
{
prod.Flags |= ProductionFlags.IsEmpty;
}
//Add final LRItem
ComputeProductionFlags(prod);
prod.LR0Items.Add(new LR0Item(_lastItemId++, prod, prod.RValues.Count, hints));
return(prod);
}
private Production CreateProduction(NonTerminal lvalue, BnfTermList operands)
{
Production prod = new Production(lvalue);
GrammarHintList hints = null;
//create RValues list skipping Empty terminal and collecting grammar hints
foreach (BnfTerm operand in operands) {
if (operand == _grammar.Empty)
continue;
//Collect hints as we go - they will be added to the next non-hint element
GrammarHint hint = operand as GrammarHint;
if (hint != null) {
if (hints == null) hints = new GrammarHintList();
hints.Add(hint);
continue;
}
//Add the operand and create LR0 Item
prod.RValues.Add(operand);
prod.LR0Items.Add(new LR0Item(_lastItemId++, prod, prod.RValues.Count - 1, hints));
hints = null;
}//foreach operand
//set the flags
if (prod.RValues.Count == 0)
prod.Flags |= ProductionFlags.IsEmpty;
//Add final LRItem
ComputeProductionFlags(prod);
prod.LR0Items.Add(new LR0Item(_lastItemId++, prod, prod.RValues.Count, hints));
return prod;
}
private Production CreateProduction(NonTerminal lvalue, BnfTermList operands)
{
Production prod = new Production(lvalue);
GrammarHintList hints = null;
//create RValues list skipping Empty terminal and collecting grammar hints
foreach (BnfTerm operand in operands) {
if (operand == Grammar.CurrentGrammar.Empty)
continue;
//Collect hints as we go - they will be added to the next non-hint element
GrammarHint hint = operand as GrammarHint;
if (hint != null) {
if (hints == null) hints = new GrammarHintList();
hints.Add(hint);
continue;
}
//Check if it is a Terminal or Error element
Terminal t = operand as Terminal;
if (t != null) {
prod.Flags |= ProductionFlags.HasTerminals;
if (t.Category == TokenCategory.Error) prod.Flags |= ProductionFlags.IsError;
}
//Add the operand info and LR0 Item
LR0Item item = new LR0Item(_lastItemId++, prod, prod.RValues.Count, hints);
prod.LR0Items.Add(item);
prod.RValues.Add(operand);
hints = null;
}//foreach operand
//set the flags
if (prod.RValues.Count == 0)
prod.Flags |= ProductionFlags.IsEmpty;
//Add final LRItem
prod.LR0Items.Add(new LR0Item(_lastItemId++, prod, prod.RValues.Count, hints));
return prod;
}
