/// <summary>
/// Read a Production
/// </summary>
/// <param name="leftCat">Left hand side category</param>
/// <param name="cncFuns">List of Concrete Functions</param>
/// <returns>Returns the Production</returns>
private Production GetProduction(int leftCat, ConcreteFunction[] cncFuns)
{
int sel = this.inputstream.ReadByte();
Production prod;
switch (sel)
{
case 0: // application
prod = new ProductionApply(leftCat, cncFuns[this.GetInt()], this.GetDomainFromPArgs());
break;
case 1: // coercion
prod = new ProductionCoerce(leftCat, this.GetInt());
break;
default:
throw new PGFException("Invalid tag for productions : " + sel);
}
return prod;
}
/// <summary>
/// Processes the current agenda.
/// </summary>
/// <param name="agenda">The agenda we want to go through.</param>
public void Process(List<ActiveItem> agenda)
{
while (agenda.Count > 0)
{
var item = agenda[agenda.Count - 1];
agenda.RemoveAt(agenda.Count - 1);
var lin = item.Seq;
if (item.Dot < lin.Count)
{
var sym = lin[item.Dot];
if (sym is SymbolCat)
{
var newSym = (SymbolCat)sym;
var fid = item.Args[newSym.Arg];
var label = newSym.Label;
var items = this.chart.LookupAC(fid, label);
if (items == null)
{
var rules = this.chart.ExpandForest(fid);
foreach (ProductionApply rule in rules)
{
var newAI = new ActiveItem(this.chart.Offset, 0, rule.Function, rule.Function.Sequences[label].ToList<Symbol>(), rule.Domain().ToList<int>(), fid, label);
agenda.Add(newAI);
}
List<ActiveItem> temp = new List<ActiveItem>();
temp.Add(item);
this.chart.InsertAC(fid, label, temp);
}
else
{
bool isMember = false;
foreach (ActiveItem ai in items)
{
if (ai.Equals(item))
{
isMember = true;
break;
}
}
if (!isMember)
{
items.Add(item);
var fid2 = this.chart.LookupPC(fid, label, this.chart.Offset);
if (fid2.HasValue)
{
agenda.Add(item.ShiftOverArg(newSym.Arg, fid2.Value));
}
}
}
}
else if (sym is SymbolLit)
{
var newSym = (SymbolLit)sym;
var fid = item.Args[newSym.Arg];
List<Production> rules;
if (this.chart.Forest.ContainsKey(fid))
{
rules = this.chart.Forest[fid];
}
else
{
rules = new List<Production>();
}
if (rules.Count > 0)
{
if (rules[0] is ProductionConst)
{
ProductionConst pc = (ProductionConst)rules[0];
List<string> tokens = new List<string>(pc.Tokens);
ActiveItem ai2 = item.ShiftOverTokn();
if (pc.Tokens.Count > 0 && (this.currentToken == string.Empty || tokens[0] == this.currentToken))
{
tokens.RemoveAt(0);
Trie tt = new Trie();
tt.Value = new List<ActiveItem>() { ai2 };
this.currentAcc = this.currentAcc.InsertChain1(tokens, tt);
}
}
}
else
{
List<Production> newProd = new List<Production>();
Symbol[][] syms = new Symbol[0][];
if (fid == -1)
{
// If string
string token = "\"" + this.currentToken + "\"";
ConcreteFunction newFun = new ConcreteFunction(token, syms);
newProd.Add(new ProductionConst(newFun, new List<string>() { token }, -1)); // nextId´+??
}
else if (fid == -2)
{
// If int
int i = 0;
if (int.TryParse(this.currentToken, out i))
{
ConcreteFunction newFun = new ConcreteFunction(this.currentToken, syms);
newProd.Add(new ProductionConst(newFun, new List<string>() { this.currentToken }, -2));
}
}
else if (fid == -3)
{
// If float
double f = 0;
if (double.TryParse(this.currentToken, NumberStyles.Number, NumberFormatInfo.InvariantInfo, out f))
{
ConcreteFunction newFun = new ConcreteFunction(this.currentToken, syms);
newProd.Add(new ProductionConst(newFun, new List<string>() { this.currentToken }, -3));
}
}
if (newProd.Count > 0)
{
var currentProd = (ProductionConst)newProd[0];
fid = this.chart.NextId++;
this.chart.Forest[fid] = newProd;
var tokens2 = new List<string>(currentProd.Tokens);
var item2 = item.ShiftOverArg(newSym.Arg, fid);
if (tokens2.Count > 0 && (this.currentToken == string.Empty || tokens2[0] == this.currentToken))
{
tokens2.RemoveAt(0);
Trie tt = new Trie();
tt.Value = new List<ActiveItem>() { item2 };
this.currentAcc = this.currentAcc.InsertChain1(tokens2, tt);
}
}
}
}
else if (sym is SymbolKP)
{
var newSym = (SymbolKP)sym;
var pitem = item.ShiftOverTokn();
var tokens = new List<string>();
foreach (Symbol newSymbol in newSym.Tokens)
{
if (newSymbol is SymbolKS)
{
// TODO is this correct?
tokens.AddRange(((SymbolKS)newSymbol).Tokens);
}
else if (newSymbol is SymbolBind)
{
tokens.Add("&+");
}
else if (newSymbol is SymbolSoftBind)
{
// Ignore
}
else if (newSymbol is SymbolSoftSpace)
{
// Ignore
}
else if (newSymbol is SymbolCapit)
{
tokens.Add("&|");
}
else if (newSymbol is SymbolAllCapit)
{
tokens.Add("&|");
}
else
{
// If new token just ignore
}
}
if (tokens.Count > 0 && (this.currentToken == string.Empty || tokens[0] == this.currentToken))
{
tokens.RemoveAt(0);
Trie tt = new Trie();
tt.Value = new List<ActiveItem>() { pitem };
this.currentAcc = this.currentAcc.InsertChain1(tokens, tt);
}
foreach (Alternative alt in newSym.Alts)
{
// TODO check if needed
Symbol[] currentSym = alt.Alt1;
tokens = new List<string>(alt.Alt2.ToList<string>());
if (tokens.Count > 0 && (this.currentToken == string.Empty || tokens[0] == this.currentToken))
{
tokens.RemoveAt(0);
Trie tt = new Trie();
tt.Value = new List<ActiveItem>() { pitem };
this.currentAcc = this.currentAcc.InsertChain1(tokens, tt);
}
}
}
else if (sym is SymbolKS)
{
var newSym = (SymbolKS)sym;
var tokens = new List<string>(newSym.Tokens.ToList<string>());
var ai = item.ShiftOverTokn();
if (tokens.Count > 0 && (this.currentToken == string.Empty || tokens[0] == this.currentToken))
{
tokens.RemoveAt(0);
Trie tt = new Trie();
tt.Value = new List<ActiveItem>() { ai };
this.currentAcc = this.currentAcc.InsertChain1(tokens, tt);
}
}
else if (sym is SymbolVar)
{
var newSym = (SymbolVar)sym;
// TODO Not implemented
throw new NotImplementedException();
}
}
else
{
int? tempfid = this.chart.LookupPC(item.FId, item.Lbl, item.Offset);
if (!tempfid.HasValue)
{
int fid = this.chart.NextId++;
var items = this.chart.LookupACo(item.Offset, item.FId, item.Lbl);
if (items != null)
{
foreach (ActiveItem pitem in items)
{
var temp = pitem.Seq[pitem.Dot];
if (temp is SymbolCat)
{
var arg = ((SymbolCat)temp).Arg;
agenda.Add(pitem.ShiftOverArg(arg, fid));
}
else if (temp is SymbolLit)
{
var arg = ((SymbolLit)temp).Arg;
agenda.Add(pitem.ShiftOverArg(arg, fid));
}
}
}
this.chart.InsertPC(item.FId, item.Lbl, item.Offset, fid);
var newProd = new ProductionApply(item.Fun, item.Args.ToArray<int>());
if (this.chart.Forest.ContainsKey(fid))
{
this.chart.Forest[fid].Add(newProd);
}
else
{
this.chart.Forest[fid] = new List<Production>() { newProd };
}
}
else
{
int fid = tempfid.Value;
var labels = this.chart.LabelsAC(fid);
foreach (int k in labels.Keys)
{
var newAI = new ActiveItem(this.chart.Offset, 0, item.Fun, item.Fun.Sequences[k].ToList<Symbol>(), item.Args, fid, k);
agenda.Add(newAI);
}
var rules = this.chart.Forest[fid];
var rule = new ProductionApply(item.Fun, item.Args.ToArray<int>());
bool isMember = false;
foreach (Production p in rules)
{
if (p is ProductionApply)
{
if (rule.Equals((ProductionApply)p))
{
isMember = true;
}
}
}
if (!isMember)
{
rules.Add(rule);
}
}
}
}
}