/// <summary>
/// Performs string auto completing. Instead of strings it returns node at the en of matching sequence.
/// </summary>
/// <param name="matching">The matching.</param>
/// <param name="rules">The rules.</param>
/// <returns></returns>
public List <KeyValuePair <float, StringTreeNode> > AutoComplete([NotEmpty] string matching, [NotNull] StringMatchingRules rules)
{
List <KeyValuePair <float, StringTreeNode> > result = new List <KeyValuePair <float, StringTreeNode> >();
for (int i = 0; i < root.children.Count; i++)
{
root.children[i].AutoComplete(matching, 0, rules.InitialScore, rules, result);
}
return(result);
}
/// <summary>
/// Matches the specified STR.
/// </summary>
/// <param name="str">The STR.</param>
/// <param name="position">The position.</param>
/// <param name="score">The score.</param>
/// <param name="rules">The rules.</param>
/// <param name="result">The result.</param>
internal protected void Match(string str, int position, float score, StringMatchingRules rules, List <KeyValuePair <float, string> > result)
{
// If cannot procceed, return.
if (score < rules.MinScoreFilter)
{
return;
}
// This is special case if appending.
if (str.Length == position)
{
// We decrement the score.
score -= rules.CharMissingPenaltyAtEnd;
if (score < rules.MinScoreFilter)
{
return;
}
// We do the search.
if (internalString != string.Empty)
{
result.Add(new KeyValuePair <float, string>(score, internalString));
}
// We now expand to all children.
for (int i = 0; i < children.Count; i++)
{
children[i].Match(str, position, score, rules, result);
}
return;
}
// We first check if matched.
if (str[position] == character)
{
// We check if we can match against internal string.
if (internalString != string.Empty)
{
float xscore = score - rules.CharIgnorePenalty * (str.Length - position - 1);
if (xscore >= rules.MinScoreFilter)
{
result.Add(new KeyValuePair <float, string>(score, internalString));
}
}
// We proceed matching
for (int i = 0; i < children.Count; i++)
{
children[i].Match(str, position + 1, score, rules, result);
}
}
else if (char.ToLowerInvariant(str[position]) == char.ToLowerInvariant(character))
{
float xscore = score + rules.CharCaseMismatchPenalty;
// We check if we have internal string.
if (internalString != string.Empty)
{
float xxscore = score - rules.CharIgnorePenalty * (str.Length - position - 1);
if (xxscore >= rules.MinScoreFilter)
{
result.Add(new KeyValuePair <float, string>(score, internalString));
}
}
// We proceed matching.
for (int i = 0; i < children.Count; i++)
{
children[i].Match(str, position + 1, xscore, rules, result);
}
}
else
{
// Ignore character case.
for (int i = 0; i < children.Count; i++)
{
children[i].Match(str, position, score - rules.CharIgnorePenalty, rules, result);
}
// Insert character case.
for (int j = 0; j < children.Count; j++)
{
children[j].Match(str, position + 1, score - rules.CharMissingPenalty, rules, result);
}
}
}
/// <summary>
/// We do a search using supplied rules.
/// </summary>
/// <param name="matching"></param>
/// <param name="rules"></param>
public List <KeyValuePair <float, string> > Search([NotEmpty] string matching, [NotNull] StringMatchingRules rules)
{
// We start the progress.
List <KeyValuePair <float, string> > result = new List <KeyValuePair <float, string> >();
for (int i = 0; i < root.children.Count; i++)
{
root.children[i].Match(matching, 0, rules.InitialScore, rules, result);
}
// We return the result.
return(result);
}
/// <summary>
/// Auto completes the string.
/// </summary>
/// <param name="str">The STR.</param>
/// <param name="position">The position.</param>
/// <param name="score">The score.</param>
/// <param name="rules">The rules.</param>
/// <param name="result">The result.</param>
internal protected void AutoComplete(string str, int position, float score,
StringMatchingRules rules, List <KeyValuePair <float, StringTreeNode> > result)
{
// If cannot procceed, return.
if (score < rules.MinScoreFilter)
{
return;
}
// Check if last character.
if (position + 1 == str.Length)
{
result.Add(new KeyValuePair <float, StringTreeNode>(score, this));
return;
}
// We first check if matched.
if (str[position] == character)
{
// We check if we can match against internal string.
if (internalString != string.Empty)
{
float xscore = score - rules.CharIgnorePenalty * (str.Length - position - 1);
if (xscore >= rules.MinScoreFilter)
{
result.Add(new KeyValuePair <float, StringTreeNode>(score, this));
}
}
// We proceed matching
for (int i = 0; i < children.Count; i++)
{
children[i].AutoComplete(str, position + 1, score, rules, result);
}
}
else if (char.ToLowerInvariant(str[position]) == char.ToLowerInvariant(character))
{
float xscore = score + rules.CharCaseMismatchPenalty;
// We check if we have internal string.
if (internalString != string.Empty)
{
float xxscore = score - rules.CharIgnorePenalty * (str.Length - position - 1);
if (xxscore >= rules.MinScoreFilter)
{
result.Add(new KeyValuePair <float, StringTreeNode>(score, this));
}
}
// We proceed matching.
for (int i = 0; i < children.Count; i++)
{
children[i].AutoComplete(str, position + 1, xscore, rules, result);
}
}
else
{
// Ignore character case.
for (int i = 0; i < children.Count; i++)
{
children[i].AutoComplete(str, position, score - rules.CharIgnorePenalty, rules, result);
}
// Insert character case.
for (int j = 0; j < children.Count; j++)
{
children[j].AutoComplete(str, position + 1, score - rules.CharMissingPenalty, rules, result);
}
}
}