/// <inheritdoc/>
internal override WordGroupMatch Match(TripletWordGroup[] groups, int groupIndex)
{
if (groupIndex + Length > groups.Length)
//the input is not long enough
return null;
//predicate rules match one to one to groups
var substitutedGroups = new List<TripletWordGroup>();
for (var i = 0; i < _constraints.Length; ++i)
{
var constraint = _constraints[i];
var group = groups[groupIndex + i];
if (!constraint.Match(group))
//the constraint does'nt match
return null;
if (constraint.CanBeSubstituted)
substitutedGroups.Add(group);
}
var context = new ParsingContext(substitutedGroups.ToArray());
var predicate = _factory(context);
var predicateGroup = new TripletWordGroup(predicate);
return new WordGroupMatch(predicateGroup, Length);
}
internal override WordGroupMatch Match(TripletWordGroup[] groups, int groupIndex)
{
//mapping of ids to matched groups
var matchMapping = new Dictionary<string, IEnumerable<TripletWordGroup>>();
var currentGroupIndex = groupIndex;
//process all constraints
for (var i = 0; i < _constraints.Length; ++i)
{
var constraint = _constraints[i];
var nextConstraint = i + 1 >= _constraints.Length ? null : _constraints[i + 1];
var matchedGroups = new List<TripletWordGroup>();
matchMapping[constraint.Id] = matchedGroups;
var isSatisfied = false;
while (currentGroupIndex < groups.Length)
{
var currentGroup = groups[currentGroupIndex];
var isMatch = constraint.Match(currentGroup);
var isNextMatch = nextConstraint != null && nextConstraint.Match(currentGroup);
if (isSatisfied && isNextMatch)
//we are greedy - matching as small groups as possible
//leting next constraint to match
break;
if (isMatch)
{
isSatisfied = true;
matchedGroups.Add(currentGroup);
++currentGroupIndex;
if (!constraint.IsMultiMatch)
//we can match only one word to this constraint
break;
}
else
{
// current constraint cannot be further satisfied by current group
break;
}
}
if (!isSatisfied)
//constraint was not satisfied.
return null;
}
var context = new ParsingContext(matchMapping);
var triplet = _factory(context);
var tripletGroup = new TripletWordGroup(triplet);
var match = new WordGroupMatch(tripletGroup, currentGroupIndex - groupIndex);
return match;
}
internal bool Match(TripletWordGroup group)
{
return _matcher(group);
}
internal WordGroupMatch(TripletWordGroup resultGroup, int length)
{
Length = length;
ResultGroup = resultGroup;
}
internal abstract WordGroupMatch Match(TripletWordGroup[] groups, int groupIndex);
internal ParsingContext(TripletWordGroup[] positionalGroups)
{
_positionalGroups = positionalGroups;
}
/// <summary>
/// Determine whether the given group has the requested lexical type.
/// </summary>
/// <param name="lexicalType"></param>
/// <param name="group"></param>
/// <returns><c>true</c> if group has the given lexical type, <c>false</c> otherwise.</returns>
internal bool HasLexicalType(string lexicalType, TripletWordGroup group)
{
var groupType = group.RawGroup.GetType().ToString();
return groupType.EndsWith("." + lexicalType);
}