public static string ToStringJoin(this IEnumerable<string> ienum, string separator = ", ") {
if(ienum == null) { return ""; }
if(separator == null) { separator = ""; }
var ls = ListCache<string>.Take();
var size = 0;
foreach(string item in ienum) {
if (!string.IsNullOrWhiteSpace(item)) {
var str = item.Trim();
size += str.Length + separator.Length;
ls.Add(str);
}
}
var sb = StringBuilderCache.Take(size);
for(var i = 0; i < ls.Count; i++) {
sb.Append(ls[i]);
if (i < ls.Count - 1) { sb.Append(separator); }
}
ListCache<string>.Return(ref ls);
return StringBuilderCache.Release(ref sb);
}
public void Add(string key, T value)
{
ListCache <string> .Take();
List <string> words = ListCache <string> .Take();
GetNormalizedTerms(key, words);
for (var i = 0; i < words.Count; i++)
{
string word = words[i];
CharNode current = RootNode;
for (int idx = 0; idx < word.Length; idx++)
{
char ch = word[idx];
if (current.Children == null)
{
current.Children = new Dictionary <char, CharNode>();
}
current = current.Children.TryGetValue(ch, out CharNode next) ? next : AddNodeChild(current, ch);
}
AddNodeItem(current, word, value);
}
ListCache <string> .Return(ref words);
}
private static void GetNormalizedTerms(string input, List <string> lsTerms)
{
if (String.IsNullOrWhiteSpace(input))
{
return;
}
string str = input.Normalize(NormalizationForm.FormD);
StringBuilder sbWord = StringBuilderCache.Take();
List <string> words = ListCache <string> .Take();
char ch;
for (var i = 0; i < str.Length; i++)
{
ch = str[i];
UnicodeCategory cat = CharUnicodeInfo.GetUnicodeCategory(ch);
switch (cat)
{
case UnicodeCategory.TitlecaseLetter:
case UnicodeCategory.UppercaseLetter: sbWord.Append(char.ToLower(ch)); break;
case UnicodeCategory.LowercaseLetter: sbWord.Append(ch); break;
case UnicodeCategory.DecimalDigitNumber: sbWord.Append(ch); break;
case UnicodeCategory.DashPunctuation:
case UnicodeCategory.ConnectorPunctuation:
if (sbWord.Length > 0 && sbWord[sbWord.Length - 1] != '-')
{
sbWord.Append('-');
}
break;
case UnicodeCategory.SpaceSeparator:
if (sbWord.Length > 0)
{
words.Add(sbWord.ToString());
sbWord.Clear();
}
break;
case UnicodeCategory.LineSeparator:
case UnicodeCategory.ParagraphSeparator:
case UnicodeCategory.OtherPunctuation:
if (sbWord.Length > 0)
{
words.Add(sbWord.ToString());
WordsToTerms();
}
break;
}
}
if (sbWord.Length > 0)
{
words.Add(sbWord.ToString());
}
WordsToTerms();
StringBuilderCache.Return(ref sbWord);
ListCache <string> .Return(ref words);
void WordsToTerms()
{
int n = lsTerms.Count;
sbWord.Clear();
for (var i = 0; i < words.Count; i++)
{
if (i > 0)
{
sbWord.Append(" ");
}
sbWord.Append(words[i]);
if (i > 0)
{
lsTerms.Add(sbWord.ToString());
}
}
sbWord.Clear();
lsTerms.Reverse(n, lsTerms.Count - n);
for (var i = 0; i < words.Count; i++)
{
lsTerms.Add(words[i]);
}
words.Clear();
}
}
