internal static int TdbCompareStrings(IStringIterator s1, string s2, bool caseSensitive)
{
return TdbCompareStrings(s1, new StringStringIterator(s2), caseSensitive);
}
// Strings mit IEnumerable<char> zu vergleichen ist nicht sinnvoll, weil dabei jedesmal ein CharComparer-
// Objekt erzeugt wird.
internal static int TdbCompareStrings(IStringIterator s1, IStringIterator s2, bool caseSensitive)
{
int result = 0;
int len1 = s1.Length;
int len2 = s2.Length;
bool inUmlaut1 = false;
bool inUmlaut2 = false;
int p1 = int.MaxValue;
int p2 = int.MaxValue;
char c1 = (char)0;
char c2 = (char)0;
int i1 = 0, i2 = 0;
while ((i1 < len1) && (i2 < len2)) {
// Character von s1 behandeln
c1 = s1[i1];
if (c1 == '^') c1 = ' ';
if (c1 == 'ß') {
c1 = 's';
if (inUmlaut1) inUmlaut1 = false;
else { inUmlaut1 = true; --i1; }
} else if (c1 >= 128 && c1 < 256) {
c1 = umlautReplacementMap[(ushort)c1 & 0x7f];
if (p1 == int.MaxValue) p1 = i1;
}
if (!caseSensitive && c1 < 256) c1 = (char)upperMap[(byte)c1];
//
// Character von s2 behandeln
c2 = s2[i2];
if (c2 == '^') c2 = ' ';
if (c2 == 'ß') {
c2 = 's';
if (inUmlaut2) inUmlaut2 = false;
else { inUmlaut2 = true; --i2; }
} else if (c2 >= 128 && c2 < 256) {
c2 = umlautReplacementMap[(ushort)c2 & 0x7f];
if (p2 == int.MaxValue) p2 = i2;
}
if (!caseSensitive && c2 < 256) c2 = (char)upperMap[(byte)c2];
//
if (p1 == p2) { p1 = int.MaxValue; p2 = int.MaxValue; }
if (c1 != c2) break;
//
++i1; ++i2;
}
if (i1 < len1 && i2 < len2) {
if (c1 < c2) result = -1;
else if (c1 > c2) result = +1;
else if (p1 < p2) result = +1;
else if (p1 > p2) result = -1;
else result = 0;
} else if (i1 < len1) {
// Der linke ist länger
result = +1;
} else if (i2 < len2) {
// Der rechte ist länger
result = -1;
} else if (p1 < p2) result = +1;
else if (p1 > p2) result = -1;
else result = 0;
return result;
}
internal static int TdbCompareStrings(string s1, IStringIterator s2, bool caseSensitive)
{
return TdbCompareStrings(new StringStringIterator(s1), s2, caseSensitive);
}
