internal static ReductionAction <SYMBOL_ENUM, TREE_NODE> Create <SYMBOL_ENUM, TREE_NODE>(SingleState <SYMBOL_ENUM, TREE_NODE> state,
CoverSets <SYMBOL_ENUM> coverSets,
HorizonSets <SYMBOL_ENUM> horizonSets)
where SYMBOL_ENUM : struct
where TREE_NODE : class
{
SymbolChunkSet <SYMBOL_ENUM> cover = coverSets[state.LhsSymbol];
SymbolChunkSet <SYMBOL_ENUM> horizon = horizonSets[state.LhsSymbol];
// if we have internal conflict between symbols, we cannot use horizon data (because we couldn't tell if we reached horizon)
bool use_horizon = !horizon.IsEmpty && !cover.Overlaps(horizon);
var action = new ReductionAction <SYMBOL_ENUM, TREE_NODE>(state.CreateCell(), use_horizon ? horizon : null,
use_horizon ? new SymbolChunkSet <SYMBOL_ENUM>() : null);
return(action);
}
public ActionTable <SYMBOL_ENUM, TREE_NODE> FillActionTable(Productions <SYMBOL_ENUM, TREE_NODE> productions,
FirstSets <SYMBOL_ENUM> firstSets,
CoverSets <SYMBOL_ENUM> coverSets,
HorizonSets <SYMBOL_ENUM> horizonSets,
int lookaheadWidth,
Dfa <SYMBOL_ENUM, TREE_NODE> dfa,
PrecedenceTable <SYMBOL_ENUM> precedenceTable,
GrammarReport <SYMBOL_ENUM, TREE_NODE> report)
{
this.coverSets = coverSets;
this.horizonSets = horizonSets;
this.report = report;
this.precedenceTable = precedenceTable ?? new PrecedenceTable <SYMBOL_ENUM>(productions.SymbolsRep);
this.symbolsRep = productions.SymbolsRep;
actionTable = new ActionTable <SYMBOL_ENUM, TREE_NODE>(dfa, productions,
lookaheadWidth);
foreach (Node <SYMBOL_ENUM, TREE_NODE> node in dfa.Nodes)
{
foreach (SymbolChunk <SYMBOL_ENUM> chunk in node.State.PossibleInputs)
{
ParseAction <SYMBOL_ENUM, TREE_NODE> action_data = computeAction(node, chunk);
if (!report.HasGrammarErrors)
{
actionTable.Add(node.State.Index, chunk, new[] { action_data });
}
}
// checking recovery conflicts
IEnumerable <SingleState <SYMBOL_ENUM, TREE_NODE> > recovery_items = node.State.ParsingActiveItems
.Where(it => it.IsAtRecoveryPoint);
var recovery_stats = DynamicDictionary.CreateWithDefault <SYMBOL_ENUM, List <SingleState <SYMBOL_ENUM, TREE_NODE> > >();
foreach (SingleState <SYMBOL_ENUM, TREE_NODE> rec_state in recovery_items)
{
foreach (SymbolChunk <SYMBOL_ENUM> first in firstSets[rec_state.RecoveryMarkerSymbol].Chunks)
{
recovery_stats[first.Symbols.First()].Add(rec_state);
}
}
foreach (var pair in recovery_stats.Where(it => it.Value.Count > 1))
{
report.AddError(pair.Value.Select(it => it.IndexStr), "Recovery item conflict on \"" + symbolsRep.Get(pair.Key) + "\".");
}
}
report.AddWarnings(precedenceTable.GetUnusedEntries(symbolsRep));
if (report.HasGrammarErrors)
{
return(null);
}
else
{
report.ActionTable = actionTable;
return(actionTable);
}
}