private void GatherCandidatesFromGrammarItem(ISqlGrammarRuleSequenceItem item, ICollection <TerminalCandidate> candidates)
{
if (item is SqlGrammarRuleSequenceNonTerminal nonTerminal)
{
GatherCandidatesFromNonterminal(nonTerminal, candidates);
}
else if (!TerminatorIds.Contains(item.Id))
{
List <string> followingMandatoryCandidates = null;
var terminal = ((SqlGrammarRuleSequenceTerminal)item).Terminal;
if (terminal.IsFixed)
{
followingMandatoryCandidates = new List <string>();
for (var j = item.SequenceIndex + 1; j < item.ParentSequence.Items.Length; j++)
{
if (!GetFollowingMandatoryCandidates((ISqlGrammarRuleSequenceItem)item.ParentSequence.Items[j], followingMandatoryCandidates))
{
break;
}
}
}
candidates.Add(new TerminalCandidate(item.Id, followingMandatoryCandidates));
}
}
private static bool GetFollowingMandatoryCandidates(ISqlGrammarRuleSequenceItem item, ICollection <string> followingMandatoryCandidates)
{
if (!item.IsRequired)
{
return(false);
}
if (item.Type == NodeType.Terminal)
{
var terminal = ((SqlGrammarRuleSequenceTerminal)item).Terminal;
if (terminal.IsFixed && terminal.Value.Length > 1)
{
followingMandatoryCandidates.Add(item.Id);
return(true);
}
return(false);
}
var nonTerminal = (SqlGrammarRuleSequenceNonTerminal)item;
return(nonTerminal.TargetRule.Sequences.Length == 1 &&
nonTerminal.TargetRule.Sequences[0].Items
.All(childItem => GetFollowingMandatoryCandidates((ISqlGrammarRuleSequenceItem)childItem, followingMandatoryCandidates)));
}
private void GatherCandidatesFromGrammarItem(ISqlGrammarRuleSequenceItem item, ICollection<TerminalCandidate> candidates)
{
var nonTerminal = item as SqlGrammarRuleSequenceNonTerminal;
if (nonTerminal != null)
{
GatherCandidatesFromNonterminal(nonTerminal, candidates);
}
else if (!TerminatorIds.Contains(item.Id))
{
List<string> followingMandatoryCandidates = null;
var terminal = ((SqlGrammarRuleSequenceTerminal)item).Terminal;
if (terminal.IsFixed)
{
followingMandatoryCandidates = new List<string>();
for (var j = item.SequenceIndex + 1; j < item.ParentSequence.Items.Length; j++)
{
if (!GetFollowingMandatoryCandidates((ISqlGrammarRuleSequenceItem)item.ParentSequence.Items[j], followingMandatoryCandidates))
{
break;
}
}
}
candidates.Add(new TerminalCandidate(item.Id, followingMandatoryCandidates));
}
}
private static bool GetFollowingMandatoryCandidates(ISqlGrammarRuleSequenceItem item, ICollection<string> followingMandatoryCandidates)
{
if (!item.IsRequired)
{
return false;
}
if (item.Type == NodeType.Terminal)
{
var terminal = ((SqlGrammarRuleSequenceTerminal)item).Terminal;
if (terminal.IsFixed && terminal.Value.Length > 1)
{
followingMandatoryCandidates.Add(item.Id);
return true;
}
return false;
}
var nonTerminal = (SqlGrammarRuleSequenceNonTerminal)item;
return nonTerminal.TargetRule.Sequences.Length == 1 &&
nonTerminal.TargetRule.Sequences[0].Items
.All(childItem => GetFollowingMandatoryCandidates((ISqlGrammarRuleSequenceItem)childItem, followingMandatoryCandidates));
}
