private bool GetCEsFromCE32(CollationData data, int c, int ce32)
{
ce32 = data.GetFinalCE32(ce32);
ce1 = 0;
if (Collation.IsSimpleOrLongCE32(ce32))
{
ce0 = Collation.CeFromCE32(ce32);
}
else
{
switch (Collation.TagFromCE32(ce32))
{
case Collation.LATIN_EXPANSION_TAG:
ce0 = Collation.LatinCE0FromCE32(ce32);
ce1 = Collation.LatinCE1FromCE32(ce32);
break;
case Collation.EXPANSION32_TAG:
{
int index = Collation.IndexFromCE32(ce32);
int length = Collation.LengthFromCE32(ce32);
if (length <= 2)
{
ce0 = Collation.CeFromCE32(data.ce32s[index]);
if (length == 2)
{
ce1 = Collation.CeFromCE32(data.ce32s[index + 1]);
}
break;
}
else
{
return(false);
}
}
case Collation.EXPANSION_TAG:
{
int index = Collation.IndexFromCE32(ce32);
int length = Collation.LengthFromCE32(ce32);
if (length <= 2)
{
ce0 = data.ces[index];
if (length == 2)
{
ce1 = data.ces[index + 1];
}
break;
}
else
{
return(false);
}
}
// Note: We could support PREFIX_TAG (assert c>=0)
// by recursing on its default CE32 and checking that none of the prefixes starts
// with a fast Latin character.
// However, currently (2013) there are only the L-before-middle-dot
// prefix mappings in the Latin range, and those would be rejected anyway.
case Collation.CONTRACTION_TAG:
Debug.Assert(c >= 0);
return(GetCEsFromContractionCE32(data, ce32));
case Collation.OFFSET_TAG:
Debug.Assert(c >= 0);
ce0 = data.GetCEFromOffsetCE32(c, ce32);
break;
default:
return(false);
}
}
// A mapping can be completely ignorable.
if (ce0 == 0)
{
return(ce1 == 0);
}
// We do not support an ignorable ce0 unless it is completely ignorable.
long p0 = ce0.TripleShift(32);
if (p0 == 0)
{
return(false);
}
// We only support primaries up to the Latin script.
if (p0 > lastLatinPrimary)
{
return(false);
}
// We support non-common secondary and case weights only together with short primaries.
int lower32_0 = (int)ce0;
if (p0 < firstShortPrimary)
{
int sc0 = lower32_0 & Collation.SECONDARY_AND_CASE_MASK;
if (sc0 != Collation.COMMON_SECONDARY_CE)
{
return(false);
}
}
// No below-common tertiary weights.
if ((lower32_0 & Collation.OnlyTertiaryMask) < Collation.CommonWeight16)
{
return(false);
}
if (ce1 != 0)
{
// Both primaries must be in the same group,
// or both must get short mini primaries,
// or a short-primary CE is followed by a secondary CE.
// This is so that we can test the first primary and use the same mask for both,
// and determine for both whether they are variable.
long p1 = ce1.TripleShift(32);
if (p1 == 0 ? p0 < firstShortPrimary : !InSameGroup(p0, p1))
{
return(false);
}
int lower32_1 = (int)ce1;
// No tertiary CEs.
if ((lower32_1.TripleShift(16)) == 0)
{
return(false);
}
// We support non-common secondary and case weights
// only for secondary CEs or together with short primaries.
if (p1 != 0 && p1 < firstShortPrimary)
{
int sc1 = lower32_1 & Collation.SECONDARY_AND_CASE_MASK;
if (sc1 != Collation.COMMON_SECONDARY_CE)
{
return(false);
}
}
// No below-common tertiary weights.
if ((lower32_0 & Collation.OnlyTertiaryMask) < Collation.CommonWeight16)
{
return(false);
}
}
// No quaternary weights.
if (((ce0 | ce1) & Collation.QuaternaryMask) != 0)
{
return(false);
}
return(true);
}
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;
}
}
}
