/// <summary>
/// Returns the single CE that c maps to.
/// Throws <see cref="NotSupportedException"/> if <paramref name="c"/> does not map to a single CE.
/// </summary>
internal long GetSingleCE(int c)
{
CollationData d;
int ce32 = GetCE32(c);
if (ce32 == Collation.FALLBACK_CE32)
{
d = base_;
ce32 = base_.GetCE32(c);
}
else
{
d = this;
}
while (Collation.IsSpecialCE32(ce32))
{
switch (Collation.TagFromCE32(ce32))
{
case Collation.LATIN_EXPANSION_TAG:
case Collation.BUILDER_DATA_TAG:
case Collation.PREFIX_TAG:
case Collation.CONTRACTION_TAG:
case Collation.HANGUL_TAG:
case Collation.LEAD_SURROGATE_TAG:
throw new NotSupportedException(string.Format(
"there is not exactly one collation element for U+{0:X4} (CE32 0x{1:x8})",
c, ce32));
case Collation.FALLBACK_TAG:
case Collation.RESERVED_TAG_3:
throw new InvalidOperationException(string.Format(
"unexpected CE32 tag for U+{0:X4} (CE32 0x{1:x8})", c, ce32));
case Collation.LONG_PRIMARY_TAG:
return(Collation.CeFromLongPrimaryCE32(ce32));
case Collation.LONG_SECONDARY_TAG:
return(Collation.CeFromLongSecondaryCE32(ce32));
case Collation.EXPANSION32_TAG:
if (Collation.LengthFromCE32(ce32) == 1)
{
ce32 = d.ce32s[Collation.IndexFromCE32(ce32)];
break;
}
else
{
throw new NotSupportedException(string.Format(
"there is not exactly one collation element for U+{0:X4} (CE32 0x{1:x8})",
c, ce32));
}
case Collation.EXPANSION_TAG:
{
if (Collation.LengthFromCE32(ce32) == 1)
{
return(d.ces[Collation.IndexFromCE32(ce32)]);
}
else
{
throw new NotSupportedException(string.Format(
"there is not exactly one collation element for U+{0:X4} (CE32 0x{1:x8})",
c, ce32));
}
}
case Collation.DIGIT_TAG:
// Fetch the non-numeric-collation CE32 and continue.
ce32 = d.ce32s[Collation.IndexFromCE32(ce32)];
break;
case Collation.U0000_TAG:
Debug.Assert(c == 0);
// Fetch the normal ce32 for U+0000 and continue.
ce32 = d.ce32s[0];
break;
case Collation.OFFSET_TAG:
return(d.GetCEFromOffsetCE32(c, ce32));
case Collation.IMPLICIT_TAG:
return(Collation.UnassignedCEFromCodePoint(c));
}
}
return(Collation.CeFromSimpleCE32(ce32));
}
private void HandleCE32(int start, int end, int ce32)
{
for (; ;)
{
if ((ce32 & 0xff) < Collation.SPECIAL_CE32_LOW_BYTE)
{
// !isSpecialCE32()
if (sink != null)
{
sink.HandleCE(Collation.CeFromSimpleCE32(ce32));
}
return;
}
switch (Collation.TagFromCE32(ce32))
{
case Collation.FALLBACK_TAG:
return;
case Collation.RESERVED_TAG_3:
case Collation.BUILDER_DATA_TAG:
case Collation.LEAD_SURROGATE_TAG:
// Java porting note: U_INTERNAL_PROGRAM_ERROR is set to errorCode in ICU4C.
throw new InvalidOperationException(
string.Format("Unexpected CE32 tag type {0} for ce32=0x{1:x8}",
Collation.TagFromCE32(ce32), ce32));
case Collation.LONG_PRIMARY_TAG:
if (sink != null)
{
sink.HandleCE(Collation.CeFromLongPrimaryCE32(ce32));
}
return;
case Collation.LONG_SECONDARY_TAG:
if (sink != null)
{
sink.HandleCE(Collation.CeFromLongSecondaryCE32(ce32));
}
return;
case Collation.LATIN_EXPANSION_TAG:
if (sink != null)
{
ces[0] = Collation.LatinCE0FromCE32(ce32);
ces[1] = Collation.LatinCE1FromCE32(ce32);
sink.HandleExpansion(ces, 0, 2);
}
// Optimization: If we have a prefix,
// then the relevant strings have been added already.
if (unreversedPrefix.Length == 0)
{
AddExpansions(start, end);
}
return;
case Collation.EXPANSION32_TAG:
if (sink != null)
{
int idx = Collation.IndexFromCE32(ce32);
int length = Collation.LengthFromCE32(ce32);
for (int i = 0; i < length; ++i)
{
ces[i] = Collation.CeFromCE32(data.ce32s[idx + i]);
}
sink.HandleExpansion(ces, 0, length);
}
// Optimization: If we have a prefix,
// then the relevant strings have been added already.
if (unreversedPrefix.Length == 0)
{
AddExpansions(start, end);
}
return;
case Collation.EXPANSION_TAG:
if (sink != null)
{
int idx = Collation.IndexFromCE32(ce32);
int length = Collation.LengthFromCE32(ce32);
sink.HandleExpansion(data.ces, idx, length);
}
// Optimization: If we have a prefix,
// then the relevant strings have been added already.
if (unreversedPrefix.Length == 0)
{
AddExpansions(start, end);
}
return;
case Collation.PREFIX_TAG:
HandlePrefixes(start, end, ce32);
return;
case Collation.CONTRACTION_TAG:
HandleContractions(start, end, ce32);
return;
case Collation.DIGIT_TAG:
// Fetch the non-numeric-collation CE32 and continue.
ce32 = data.ce32s[Collation.IndexFromCE32(ce32)];
break;
case Collation.U0000_TAG:
Debug.Assert(start == 0 && end == 0);
// Fetch the normal ce32 for U+0000 and continue.
ce32 = data.ce32s[0];
break;
case Collation.HANGUL_TAG:
if (sink != null)
{
// TODO: This should be optimized,
// especially if [start..end] is the complete Hangul range. (assert that)
UTF16CollationIterator iter = new UTF16CollationIterator(data);
StringBuilderCharSequence hangul = new StringBuilderCharSequence(new StringBuilder(1));
for (int c = start; c <= end; ++c)
{
hangul.StringBuilder.Length = 0;
hangul.StringBuilder.AppendCodePoint(c);
iter.SetText(false, hangul, 0);
int length = iter.FetchCEs();
// Ignore the terminating non-CE.
Debug.Assert(length >= 2 && iter.GetCE(length - 1) == Collation.NO_CE);
sink.HandleExpansion(iter.GetCEs(), 0, length - 1);
}
}
// Optimization: If we have a prefix,
// then the relevant strings have been added already.
if (unreversedPrefix.Length == 0)
{
AddExpansions(start, end);
}
return;
case Collation.OFFSET_TAG:
// Currently no need to send offset CEs to the sink.
return;
case Collation.IMPLICIT_TAG:
// Currently no need to send implicit CEs to the sink.
return;
}
}
}