/// <summary>
/// Returns structural attributes for the provided grammar character.
/// </summary>
/// <param name="grammarCharacter"></param>
/// <returns></returns>
public BigInteger GetAttributes(GrammarCharacter grammarCharacter)
{
if (grammarCharacter == GrammarCharacter.O)
{
return(EnglishAttributes.O);
}
if (grammarCharacter == GrammarCharacter.I)
{
return(EnglishAttributes.I);
}
if (grammarCharacter == GrammarCharacter.A)
{
return(EnglishAttributes.A);
}
if (grammarCharacter == GrammarCharacter.E)
{
return(EnglishAttributes.E);
}
if (grammarCharacter == GrammarCharacter.U)
{
return(EnglishAttributes.U);
}
return(EnglishAttributes.Epsilon);
}
public override int GetHashCode()
{
int hash = 486187739;
hash = (hash * 16777619) ^ MorphRule.GetHashCode();
hash = (hash * 16777619) ^ GrammarCharacter.GetHashCode();
hash = (hash * 16777619) ^ AttributesRule.GetHashCode();
hash = (hash * 16777619) ^ SubstitutionRule.GetHashCode();
return(hash);
}
public MorphemeRule(GrammarCharacter grammarCharacter, IRule <string> morphRule, IRule <BigInteger> attributesRule)
{
GrammarCharacter = grammarCharacter;
MorphRule = morphRule ?? throw new ArgumentNullException(nameof(morphRule));
AttributesRule = attributesRule ?? throw new ArgumentNullException(nameof(attributesRule));
}
// Note: indirect append means that adtress (with unfilled values) will be inserted inbetween start and end adtree.
// Unfilled values are expected to be filled later otherwise the adtree will be not valid.
private void TryToAppendIndirectly(AttachingPosition appendingPositionOfStartElement,
IAdTree start, IAdTree end,
string expectedSignature,
List <IAdTree> results)
{
using (Trace.Entering())
{
GrammarCharacter startGrammarCharacter = GrammarCharacter.e;
GrammarCharacter endGrammarCharacter = GrammarCharacter.e;
// If start adTree connects the bridge on its left.
if (appendingPositionOfStartElement == AttachingPosition.ParrentForLeft)
{
startGrammarCharacter = start.Pattern.LeftRule.GrammarCharacter;
endGrammarCharacter = end.RulingGrammarCharacter;
}
// If start adTree connects the bridge on its right.
else if (appendingPositionOfStartElement == AttachingPosition.ParrentForRight)
{
startGrammarCharacter = start.Pattern.RightRule.GrammarCharacter;
endGrammarCharacter = end.RulingGrammarCharacter;
}
// If the bridge connects the start adtree on its left.
else if (appendingPositionOfStartElement == AttachingPosition.ChildOnLeft)
{
startGrammarCharacter = start.RulingGrammarCharacter;
endGrammarCharacter = end.RulingGrammarCharacter;
}
// If the bridge connects the start adtree on its right.
else if (appendingPositionOfStartElement == AttachingPosition.ChildOnRight)
{
startGrammarCharacter = start.RulingGrammarCharacter;
endGrammarCharacter = end.RulingGrammarCharacter;
}
// Get all possibile ways how to get from start to end grammar character and path is not greater than 4.
IEnumerable <IReadOnlyList <DirectedEdge <GrammarCharacter, Pattern> > > connectionPaths = myConstructiveDictionary.PatternGraph
.FindAllEdges(startGrammarCharacter, endGrammarCharacter).ToList();
// Go via all possible ways.
foreach (IReadOnlyList <DirectedEdge <GrammarCharacter, Pattern> > path in connectionPaths)
{
IAdTree startCopy = start.MakeShallowCopy();
IAdTree endCopy = end.MakeShallowCopy();
IAdTree previousBridge = null;
// Go via the path.
for (int i = 0; i < path.Count; ++i)
{
DirectedEdge <GrammarCharacter, Pattern> edge = path[i];
BigInteger attributes = edge.Value.UpRule.AttributesRule is IReferenceValueRule <BigInteger> referenceAttributes ? referenceAttributes.ReferenceValue : myConstructiveDictionary.AttributesModel.GetAttributes(edge.Value.UpRule.GrammarCharacter);
IAdTree bridge = new AdTree(new Morpheme(myConstructiveDictionary.AttributesModel, "", attributes), edge.Value);
// If it is the first item on the path.
if (i == 0)
{
if (appendingPositionOfStartElement == AttachingPosition.ParrentForLeft)
{
if (startCopy.Left == null && startCopy.CanAttachToLeft(bridge, myConstructiveDictionary.AttributesModel))
{
startCopy.Left = bridge;
}
else
{
break;
}
}
else if (appendingPositionOfStartElement == AttachingPosition.ParrentForRight)
{
if (startCopy.Right == null && startCopy.CanAttachToRight(bridge, myConstructiveDictionary.AttributesModel))
{
startCopy.Right = bridge;
}
else
{
break;
}
}
else if (appendingPositionOfStartElement == AttachingPosition.ChildOnLeft)
{
if (bridge.Left == null && bridge.CanAttachToLeft(startCopy, myConstructiveDictionary.AttributesModel))
{
bridge.Left = startCopy;
}
else
{
break;
}
}
else if (appendingPositionOfStartElement == AttachingPosition.ChildOnRight)
{
if (bridge.Right == null && bridge.CanAttachToRight(startCopy, myConstructiveDictionary.AttributesModel))
{
bridge.Right = startCopy;
}
else
{
break;
}
}
}
else
{
if (previousBridge.Left == null && previousBridge.CanAttachToLeft(bridge, myConstructiveDictionary.AttributesModel))
{
previousBridge.Left = bridge;
}
else if (previousBridge.Right == null && previousBridge.CanAttachToRight(bridge, myConstructiveDictionary.AttributesModel))
{
previousBridge.Right = bridge;
}
else
{
break;
}
}
// If the signature does not match then break it.
var currentSignature = bridge.Root.GetSignature();
if (!expectedSignature.StartsWith(currentSignature))
{
break;
}
// If it is the last item in the path.
if (i == path.Count - 1)
{
if (bridge.Left == null && bridge.CanAttachToLeft(endCopy, myConstructiveDictionary.AttributesModel))
{
bridge.Left = endCopy;
currentSignature = endCopy.Root.GetSignature();
if (expectedSignature.StartsWith(currentSignature))
{
results.Add(endCopy);
}
}
else if (bridge.Right == null && bridge.CanAttachToRight(endCopy, myConstructiveDictionary.AttributesModel))
{
bridge.Right = endCopy;
currentSignature = endCopy.Root.GetSignature();
if (expectedSignature.StartsWith(currentSignature))
{
results.Add(endCopy);
}
}
else
{
break;
}
}
previousBridge = bridge;
}
}
}
}
