private int Next()
{
int c;
if (forward)
{
if (index < contextLimit)
{
c = rep.Char32At(index);
index += UTF16.GetCharCount(c);
return(c);
}
else
{
// forward context iteration reached the limit
reachedLimit = true;
}
}
else if (!forward && index > contextStart)
{
c = rep.Char32At(index - 1);
index -= UTF16.GetCharCount(c);
return(c);
}
return(-1);
}
/// <summary>
/// Default implementation of <see cref="IUnicodeMatcher.Matches(IReplaceable, int[], int, bool)"/> for Unicode
/// filters. Matches a single 16-bit code unit at offset.
/// </summary>
/// <stable>ICU 2.0</stable>
public virtual MatchDegree Matches(IReplaceable text,
int[] offset,
int limit,
bool incremental)
{
int c;
if (offset[0] < limit &&
Contains(c = text.Char32At(offset[0])))
{
offset[0] += UTF16.GetCharCount(c);
return(MatchDegree.Match);
}
if (offset[0] > limit && Contains(text.Char32At(offset[0])))
{
// Backup offset by 1, unless the preceding character is a
// surrogate pair -- then backup by 2 (keep offset pointing at
// the lead surrogate).
--offset[0];
if (offset[0] >= 0)
{
offset[0] -= UTF16.GetCharCount(text.Char32At(offset[0])) - 1;
}
return(MatchDegree.Match);
}
if (incremental && offset[0] == limit)
{
return(MatchDegree.PartialMatch);
}
return(MatchDegree.Mismatch);
}
/// <summary>
/// Implements <see cref="Transliterator.HandleTransliterate(IReplaceable, Position, bool)"/>.
/// </summary>
protected override void HandleTransliterate(IReplaceable text,
Position pos, bool incremental)
{
int start = pos.Start;
int limit = pos.Limit;
StringBuilder buf = new StringBuilder(prefix);
int prefixLen = prefix.Length;
bool redoPrefix = false;
while (start < limit)
{
int c = grokSupplementals ? text.Char32At(start) : text[start];
int charLen = grokSupplementals ? UTF16.GetCharCount(c) : 1;
if ((c & 0xFFFF0000) != 0 && supplementalHandler != null)
{
buf.Length = 0;
buf.Append(supplementalHandler.prefix);
Utility.AppendNumber(buf, c, supplementalHandler.radix,
supplementalHandler.minDigits);
buf.Append(supplementalHandler.suffix);
redoPrefix = true;
}
else
{
if (redoPrefix)
{
buf.Length = 0;
buf.Append(prefix);
redoPrefix = false;
}
else
{
buf.Length = prefixLen;
}
Utility.AppendNumber(buf, c, radix, minDigits);
buf.Append(suffix);
}
text.Replace(start, start + charLen, buf.ToString());
start += buf.Length;
limit += buf.Length - charLen;
}
pos.ContextLimit += limit - pos.Limit;
pos.Limit = limit;
pos.Start = start;
}
/// <summary>
/// Iterate forward through the string to fetch the next code point
/// to be case-mapped, and set the context indexes for it.
/// </summary>
/// <returns>The next code point to be case-mapped, or <0 when the iteration is done.</returns>
public virtual int NextCaseMapCP()
{
int c;
if (cpLimit < limit)
{
cpStart = cpLimit;
c = rep.Char32At(cpLimit);
cpLimit += UTF16.GetCharCount(c);
return(c);
}
else
{
return(-1);
}
}
/// <summary>
/// Find the source and target sets, subject to the input filter.
/// There is a known issue with filters containing multiple characters.
/// </summary>
// TODO: Problem: the rule is [{ab}]c > x
// The filter is [a{bc}].
// If the input is abc, then the rule will work.
// However, following code applying the filter won't catch that case.
internal void AddSourceTargetSet(UnicodeSet filter, UnicodeSet sourceSet, UnicodeSet targetSet, UnicodeSet revisiting)
{
int limit = anteContextLength + keyLength;
UnicodeSet tempSource = new UnicodeSet();
UnicodeSet temp = new UnicodeSet();
// We need to walk through the pattern.
// Iff some of the characters at ALL of the the positions are matched by the filter, then we add temp to toUnionTo
for (int i = anteContextLength; i < limit;)
{
int ch = UTF16.CharAt(pattern, i);
i += UTF16.GetCharCount(ch);
IUnicodeMatcher matcher = data.LookupMatcher(ch);
if (matcher == null)
{
if (!filter.Contains(ch))
{
return;
}
tempSource.Add(ch);
}
else
{
try
{
if (!filter.ContainsSome((UnicodeSet)matcher))
{
return;
}
matcher.AddMatchSetTo(tempSource);
}
catch (InvalidCastException)
{ // if the matcher is not a UnicodeSet
temp.Clear();
matcher.AddMatchSetTo(temp);
if (!filter.ContainsSome(temp))
{
return;
}
tempSource.AddAll(temp);
}
}
}
// if we made our way through the gauntlet, add to source/target
sourceSet.AddAll(tempSource);
output.AddReplacementSetTo(targetSet);
}
/// <summary>
/// Transliterate the given text with the given UTransPosition
/// indices. Return TRUE if the transliteration should continue
/// or FALSE if it should halt (because of a U_PARTIAL_MATCH match).
/// Note that FALSE is only ever returned if isIncremental is TRUE.
/// </summary>
/// <param name="text">The text to be transliterated.</param>
/// <param name="pos">The position indices, which will be updated.</param>
/// <param name="incremental">If TRUE, assume new text may be inserted
/// at index.Limit, and return FALSE if thre is a partial match.</param>
/// <returns>TRUE unless a U_PARTIAL_MATCH has been obtained,
/// indicating that transliteration should stop until more text
/// arrives.</returns>
public virtual bool Transliterate(IReplaceable text,
TransliterationPosition pos,
bool incremental)
{
int indexByte = text.Char32At(pos.Start) & 0xFF;
for (int i = index[indexByte]; i < index[indexByte + 1]; ++i)
{
MatchDegree m = rules[i].MatchAndReplace(text, pos, incremental);
switch (m)
{
case MatchDegree.Match:
if (Transliterator.DEBUG)
{
Console.Out.WriteLine((incremental ? "Rule.i: match " : "Rule: match ") +
rules[i].ToRule(true) + " => " +
UtilityExtensions.FormatInput(text, pos));
}
return(true);
case MatchDegree.PartialMatch:
if (Transliterator.DEBUG)
{
Console.Out.WriteLine((incremental ? "Rule.i: partial match " : "Rule: partial match ") +
rules[i].ToRule(true) + " => " +
UtilityExtensions.FormatInput(text, pos));
}
return(false);
default:
if (Transliterator.DEBUG)
{
Console.Out.WriteLine("Rule: no match " + rules[i]);
}
break;
}
}
// No match or partial match from any rule
pos.Start += UTF16.GetCharCount(text.Char32At(pos.Start));
if (Transliterator.DEBUG)
{
Console.Out.WriteLine((incremental ? "Rule.i: no match => " : "Rule: no match => ") +
UtilityExtensions.FormatInput(text, pos));
}
return(true);
}
public static void Permute(string source, bool skipZeros, ISet <string> output)
{
// TODO: optimize
//if (PROGRESS) System.out.println("Permute: " + source);
// optimization:
// if zero or one character, just return a set with it
// we check for length < 2 to keep from counting code points all the time
if (source.Length <= 2 && UTF16.CountCodePoint(source) <= 1)
{
output.Add(source);
return;
}
// otherwise iterate through the string, and recursively permute all the other characters
ISet <string> subpermute = new HashSet <string>();
int cp;
for (int i = 0; i < source.Length; i += UTF16.GetCharCount(cp))
{
cp = UTF16.CharAt(source, i);
// optimization:
// if the character is canonical combining class zero,
// don't permute it
if (skipZeros && i != 0 && UCharacter.GetCombiningClass(cp) == 0)
{
//System.out.println("Skipping " + Utility.hex(UTF16.valueOf(source, i)));
continue;
}
// see what the permutations of the characters before and after this one are
subpermute.Clear();
Permute(source.Substring(0, i - 0) // ICU4N: Checked 2nd parameter
+ source.Substring(i + UTF16.GetCharCount(cp)), skipZeros, subpermute); // ICU4N: Substring only has 1 parameter
// prefix this character to all of them
string chStr = UTF16.ValueOf(source, i);
foreach (string s in subpermute)
{
string piece = chStr + s;
//if (PROGRESS) System.out.println(" Piece: " + piece);
output.Add(piece);
}
}
}
/// <summary>
/// Implementation of <see cref="IUnicodeMatcher"/> API. Union the set of all
/// characters that may be matched by this object into the given
/// set.
/// </summary>
/// <param name="toUnionTo">The set into which to union the source characters.</param>
public virtual void AddMatchSetTo(UnicodeSet toUnionTo)
{
int ch;
for (int i = 0; i < pattern.Length; i += UTF16.GetCharCount(ch))
{
ch = UTF16.CharAt(pattern, i);
IUnicodeMatcher matcher = data.LookupMatcher(ch);
if (matcher == null)
{
toUnionTo.Add(ch);
}
else
{
matcher.AddMatchSetTo(toUnionTo);
}
}
}
/// <summary>
/// Union the set of all characters that may output by this object
/// into the given set.
/// </summary>
/// <param name="toUnionTo">The set into which to union the output characters.</param>
public virtual void AddReplacementSetTo(UnicodeSet toUnionTo)
{
int ch;
for (int i = 0; i < output.Length; i += UTF16.GetCharCount(ch))
{
ch = UTF16.CharAt(output, i);
IUnicodeReplacer r = data.LookupReplacer(ch);
if (r == null)
{
toUnionTo.Add(ch);
}
else
{
r.AddReplacementSetTo(toUnionTo);
}
}
}
/// <summary>
/// Implements <see cref="Transliterator.HandleTransliterate(IReplaceable, Position, bool)"/>.
/// </summary>
protected override void HandleTransliterate(IReplaceable text,
Position offsets, bool isIncremental)
{
int cursor = offsets.Start;
int limit = offsets.Limit;
StringBuilder str = new StringBuilder();
str.Append(OPEN_DELIM);
int len;
string name;
while (cursor < limit)
{
int c = text.Char32At(cursor);
if ((name = UCharacter.GetExtendedName(c)) != null)
{
str.Length = OPEN_DELIM_LEN;
str.Append(name).Append(CLOSE_DELIM);
int clen = UTF16.GetCharCount(c);
text.Replace(cursor, cursor + clen, str.ToString());
len = str.Length;
cursor += len; // advance cursor by 1 and adjust for new text
limit += len - clen; // change in length
}
else
{
++cursor;
}
}
offsets.ContextLimit += limit - offsets.Limit;
offsets.Limit = limit;
offsets.Start = cursor;
}
//
// RBBISymbolTable::parseReference This function from the abstract symbol table interface
// looks for a $variable name in the source text.
// It does not look it up, only scans for it.
// It is used by the UnicodeSet parser.
//
public virtual string ParseReference(string text, ParsePosition pos, int limit)
{
int start = pos.Index;
int i = start;
string result = "";
while (i < limit)
{
int c = UTF16.CharAt(text, i);
if ((i == start && !UChar.IsUnicodeIdentifierStart(c)) ||
!UChar.IsUnicodeIdentifierPart(c))
{
break;
}
i += UTF16.GetCharCount(c);
}
if (i == start)
{ // No valid name chars
return(result); // Indicate failure with empty string
}
pos.Index = i;
result = text.Substring(start, i - start); // ICU4N: Corrected 2nd parameter
return(result);
}
/// <summary>
/// Implements <see cref="Transliterator.HandleTransliterate(IReplaceable, Position, bool)"/>.
/// </summary>
protected override void HandleTransliterate(IReplaceable text,
Position pos, bool isIncremental)
{
int start = pos.Start;
int limit = pos.Limit;
int i, ipat;
//loop:
while (start < limit)
{
// Loop over the forms in spec[]. Exit this loop when we
// match one of the specs. Exit the outer loop if a
// partial match is detected and isIncremental is true.
for (ipat = 0; spec[ipat] != END;)
{
// Read the header
int prefixLen = spec[ipat++];
int suffixLen = spec[ipat++];
int radix = spec[ipat++];
int minDigits = spec[ipat++];
int maxDigits = spec[ipat++];
// s is a copy of start that is advanced over the
// characters as we parse them.
int s = start;
bool match = true;
for (i = 0; i < prefixLen; ++i)
{
if (s >= limit)
{
if (i > 0)
{
// We've already matched a character. This is
// a partial match, so we return if in
// incremental mode. In non-incremental mode,
// go to the next spec.
if (isIncremental)
{
goto loop_break;
}
match = false;
break;
}
}
char c = text[s++];
if (c != spec[ipat + i])
{
match = false;
break;
}
}
if (match)
{
int u = 0;
int digitCount = 0;
for (; ;)
{
if (s >= limit)
{
// Check for partial match in incremental mode.
if (s > start && isIncremental)
{
goto loop_break;
}
break;
}
int ch = text.Char32At(s);
int digit = UCharacter.Digit(ch, radix);
if (digit < 0)
{
break;
}
s += UTF16.GetCharCount(ch);
u = (u * radix) + digit;
if (++digitCount == maxDigits)
{
break;
}
}
match = (digitCount >= minDigits);
if (match)
{
for (i = 0; i < suffixLen; ++i)
{
if (s >= limit)
{
// Check for partial match in incremental mode.
if (s > start && isIncremental)
{
goto loop_break;
}
match = false;
break;
}
char c = text[s++];
if (c != spec[ipat + prefixLen + i])
{
match = false;
break;
}
}
if (match)
{
// At this point, we have a match
string str = UTF16.ValueOf(u);
text.Replace(start, s, str);
limit -= s - start - str.Length;
// The following break statement leaves the
// loop that is traversing the forms in
// spec[]. We then parse the next input
// character.
break;
}
}
}
ipat += prefixLen + suffixLen;
}
if (start < limit)
{
start += UTF16.GetCharCount(text.Char32At(start));
}
}
loop_break : { }
pos.ContextLimit += limit - pos.Limit;
pos.Limit = limit;
pos.Start = start;
}
/// <summary>
/// Implements <see cref="Transliterator.HandleTransliterate(IReplaceable, Position, bool)"/>.
/// </summary>
protected override void HandleTransliterate(IReplaceable text,
Position offsets, bool isIncremental)
{
lock (this)
{
// TODO reimplement, see ustrcase.c
// using a real word break iterator
// instead of just looking for a transition between cased and uncased characters
// call CaseMapTransliterator::handleTransliterate() for lowercasing? (set fMap)
// needs to take isIncremental into account because case mappings are context-sensitive
// also detect when lowercasing function did not finish because of context
if (offsets.Start >= offsets.Limit)
{
return;
}
// case type: >0 cased (UCaseProps.LOWER etc.) ==0 uncased <0 case-ignorable
int type;
// Our mode; we are either converting letter toTitle or
// toLower.
bool doTitle = true;
// Determine if there is a preceding context of cased case-ignorable*,
// in which case we want to start in toLower mode. If the
// prior context is anything else (including empty) then start
// in toTitle mode.
int c, start;
for (start = offsets.Start - 1; start >= offsets.ContextStart; start -= UTF16.GetCharCount(c))
{
c = text.Char32At(start);
type = csp.GetTypeOrIgnorable(c);
if (type > 0)
{ // cased
doTitle = false;
break;
}
else if (type == 0)
{ // uncased but not ignorable
break;
}
// else (type<0) case-ignorable: continue
}
// Convert things after a cased character toLower; things
// after a uncased, non-case-ignorable character toTitle. Case-ignorable
// characters are copied directly and do not change the mode.
iter.SetText(text);
iter.SetIndex(offsets.Start);
iter.SetLimit(offsets.Limit);
iter.SetContextLimits(offsets.ContextStart, offsets.ContextLimit);
result.Length = 0;
// Walk through original string
// If there is a case change, modify corresponding position in replaceable
int delta;
while ((c = iter.NextCaseMapCP()) >= 0)
{
type = csp.GetTypeOrIgnorable(c);
if (type >= 0)
{ // not case-ignorable
if (doTitle)
{
c = csp.ToFullTitle(c, iter, result, caseLocale);
}
else
{
c = csp.ToFullLower(c, iter, result, caseLocale);
}
doTitle = type == 0; // doTitle=isUncased
if (iter.DidReachLimit && isIncremental)
{
// the case mapping function tried to look beyond the context limit
// wait for more input
offsets.Start = iter.CaseMapCPStart;
return;
}
/* decode the result */
if (c < 0)
{
/* c mapped to itself, no change */
continue;
}
else if (c <= UCaseProps.MAX_STRING_LENGTH)
{
/* replace by the mapping string */
delta = iter.Replace(result.ToString());
result.Length = 0;
}
else
{
/* replace by single-code point mapping */
delta = iter.Replace(UTF16.ValueOf(c));
}
if (delta != 0)
{
offsets.Limit += delta;
offsets.ContextLimit += delta;
}
}
}
offsets.Start = offsets.Limit;
}
}
internal static int PosAfter(IReplaceable str, int pos)
{
return((pos >= 0 && pos < str.Length) ?
pos + UTF16.GetCharCount(str.Char32At(pos)) :
pos + 1);
}
/// <summary>
/// See if the decomposition of cp2 is at segment starting at <paramref name="segmentPos"/>
/// (with canonical rearrangment!).
/// If so, take the remainder, and return the equivalents.
/// </summary>
/// <param name="comp"></param>
/// <param name="segment"></param>
/// <param name="segmentPos"></param>
/// <param name="buf"></param>
/// <returns></returns>
private ISet <string> Extract(int comp, string segment, int segmentPos, StringBuffer buf)
{
if (PROGRESS)
{
Console.Out.WriteLine(" extract: " + Utility.Hex(UTF16.ValueOf(comp))
+ ", " + Utility.Hex(segment.Substring(segmentPos)));
}
string decomp = nfcImpl.GetDecomposition(comp);
if (decomp == null)
{
decomp = UTF16.ValueOf(comp);
}
// See if it matches the start of segment (at segmentPos)
bool ok = false;
int cp;
int decompPos = 0;
int decompCp = UTF16.CharAt(decomp, 0);
decompPos += UTF16.GetCharCount(decompCp); // adjust position to skip first char
//int decompClass = getClass(decompCp);
buf.Length = 0; // initialize working buffer, shared among callees
for (int i = segmentPos; i < segment.Length; i += UTF16.GetCharCount(cp))
{
cp = UTF16.CharAt(segment, i);
if (cp == decompCp)
{ // if equal, eat another cp from decomp
if (PROGRESS)
{
Console.Out.WriteLine(" matches: " + Utility.Hex(UTF16.ValueOf(cp)));
}
if (decompPos == decomp.Length)
{ // done, have all decomp characters!
buf.Append(segment.Substring(i + UTF16.GetCharCount(cp))); // add remaining segment chars
ok = true;
break;
}
decompCp = UTF16.CharAt(decomp, decompPos);
decompPos += UTF16.GetCharCount(decompCp);
//decompClass = getClass(decompCp);
}
else
{
if (PROGRESS)
{
Console.Out.WriteLine(" buffer: " + Utility.Hex(UTF16.ValueOf(cp)));
}
// brute force approach
UTF16.Append(buf, cp);
/* TODO: optimize
* // since we know that the classes are monotonically increasing, after zero
* // e.g. 0 5 7 9 0 3
* // we can do an optimization
* // there are only a few cases that work: zero, less, same, greater
* // if both classes are the same, we fail
* // if the decomp class < the segment class, we fail
*
* segClass = getClass(cp);
* if (decompClass <= segClass) return null;
*/
}
}
if (!ok)
{
return(null); // we failed, characters left over
}
if (PROGRESS)
{
Console.Out.WriteLine("Matches");
}
if (buf.Length == 0)
{
return(SET_WITH_NULL_STRING); // succeed, but no remainder
}
string remainder = buf.ToString();
// brute force approach
// to check to make sure result is canonically equivalent
/*
* String trial = Normalizer.normalize(UTF16.valueOf(comp) + remainder, Normalizer.DECOMP, 0);
* if (!segment.regionMatches(segmentPos, trial, 0, segment.length() - segmentPos)) return null;
*/
if (0 != Normalizer.Compare(UTF16.ValueOf(comp) + remainder, segment.Substring(segmentPos), 0))
{
return(null);
}
// get the remaining combinations
return(GetEquivalents2(remainder));
}
//= public static UnicodeReplacer valueOf(String output,
//= int cursorPos,
//= RuleBasedTransliterator.Data data) {
//= if (output.length() == 1) {
//= char c = output.charAt(0);
//= UnicodeReplacer r = data.lookupReplacer(c);
//= if (r != null) {
//= return r;
//= }
//= }
//= return new StringReplacer(output, cursorPos, data);
//= }
/// <summary>
/// <see cref="IUnicodeReplacer"/> API
/// </summary>
public virtual int Replace(IReplaceable text,
int start,
int limit,
int[] cursor)
{
int outLen;
int newStart = 0;
// NOTE: It should be possible to _always_ run the complex
// processing code; just slower. If not, then there is a bug
// in the complex processing code.
// Simple (no nested replacers) Processing Code :
if (!isComplex)
{
text.Replace(start, limit, output);
outLen = output.Length;
// Setup default cursor position (for cursorPos within output)
newStart = cursorPos;
}
// Complex (nested replacers) Processing Code :
else
{
/* When there are segments to be copied, use the Replaceable.copy()
* API in order to retain out-of-band data. Copy everything to the
* end of the string, then copy them back over the key. This preserves
* the integrity of indices into the key and surrounding context while
* generating the output text.
*/
StringBuffer buf = new StringBuffer();
int oOutput; // offset into 'output'
isComplex = false;
// The temporary buffer starts at tempStart, and extends
// to destLimit + tempExtra. The start of the buffer has a single
// character from before the key. This provides style
// data when addition characters are filled into the
// temporary buffer. If there is nothing to the left, use
// the non-character U+FFFF, which Replaceable subclasses
// should treat specially as a "no-style character."
// destStart points to the point after the style context
// character, so it is tempStart+1 or tempStart+2.
int tempStart = text.Length; // start of temp buffer
int destStart = tempStart; // copy new text to here
if (start > 0)
{
int len = UTF16.GetCharCount(text.Char32At(start - 1));
text.Copy(start - len, start, tempStart);
destStart += len;
}
else
{
text.Replace(tempStart, tempStart, "\uFFFF");
destStart++;
}
int destLimit = destStart;
int tempExtra = 0; // temp chars after destLimit
for (oOutput = 0; oOutput < output.Length;)
{
if (oOutput == cursorPos)
{
// Record the position of the cursor
newStart = buf.Length + destLimit - destStart; // relative to start
// the buf.length() was inserted for bug 5789
// the problem is that if we are accumulating into a buffer (when r == null below)
// then the actual length of the text at that point needs to add the buf length.
// there was an alternative suggested in #5789, but that looks like it won't work
// if we have accumulated some stuff in the dest part AND have a non-zero buffer.
}
int c = UTF16.CharAt(output, oOutput);
// When we are at the last position copy the right style
// context character into the temporary buffer. We don't
// do this before because it will provide an incorrect
// right context for previous replace() operations.
int nextIndex = oOutput + UTF16.GetCharCount(c);
if (nextIndex == output.Length)
{
tempExtra = UTF16.GetCharCount(text.Char32At(limit));
text.Copy(limit, limit + tempExtra, destLimit);
}
IUnicodeReplacer r = data.LookupReplacer(c);
if (r == null)
{
// Accumulate straight (non-segment) text.
UTF16.Append(buf, c);
}
else
{
isComplex = true;
// Insert any accumulated straight text.
if (buf.Length > 0)
{
text.Replace(destLimit, destLimit, buf.ToString());
destLimit += buf.Length;
buf.Length = 0;
}
// Delegate output generation to replacer object
int len = r.Replace(text, destLimit, destLimit, cursor);
destLimit += len;
}
oOutput = nextIndex;
}
// Insert any accumulated straight text.
if (buf.Length > 0)
{
text.Replace(destLimit, destLimit, buf.ToString());
destLimit += buf.Length;
}
if (oOutput == cursorPos)
{
// Record the position of the cursor
newStart = destLimit - destStart; // relative to start
}
outLen = destLimit - destStart;
// Copy new text to start, and delete it
text.Copy(destStart, destLimit, start);
text.Replace(tempStart + outLen, destLimit + tempExtra + outLen, "");
// Delete the old text (the key)
text.Replace(start + outLen, limit + outLen, "");
}
if (hasCursor)
{
// Adjust the cursor for positions outside the key. These
// refer to code points rather than code units. If cursorPos
// is within the output string, then use newStart, which has
// already been set above.
if (cursorPos < 0)
{
newStart = start;
int n = cursorPos;
// Outside the output string, cursorPos counts code points
while (n < 0 && newStart > 0)
{
newStart -= UTF16.GetCharCount(text.Char32At(newStart - 1));
++n;
}
newStart += n;
}
else if (cursorPos > output.Length)
{
newStart = start + outLen;
int n = cursorPos - output.Length;
// Outside the output string, cursorPos counts code points
while (n > 0 && newStart < text.Length)
{
newStart += UTF16.GetCharCount(text.Char32At(newStart));
--n;
}
newStart += n;
}
else
{
// Cursor is within output string. It has been set up above
// to be relative to start.
newStart += start;
}
cursor[0] = newStart;
}
return(outLen);
}
/// <summary>
/// Implements <see cref="Transliterator.HandleTransliterate(IReplaceable, Position, bool)"/>.
/// </summary>
protected override void HandleTransliterate(IReplaceable text,
Position offsets, bool isIncremental)
{
int maxLen = UCharacterName.Instance.MaxCharNameLength + 1; // allow for temporary trailing space
StringBuffer name = new StringBuffer(maxLen);
// Get the legal character set
UnicodeSet legal = new UnicodeSet();
UCharacterName.Instance.GetCharNameCharacters(legal);
int cursor = offsets.Start;
int limit = offsets.Limit;
// Modes:
// 0 - looking for open delimiter
// 1 - after open delimiter
int mode = 0;
int openPos = -1; // open delim candidate pos
int c;
while (cursor < limit)
{
c = text.Char32At(cursor);
switch (mode)
{
case 0: // looking for open delimiter
if (c == OPEN_DELIM)
{ // quick check first
openPos = cursor;
int i = Utility.ParsePattern(OPEN_PAT, text, cursor, limit);
if (i >= 0 && i < limit)
{
mode = 1;
name.Length = 0;
cursor = i;
continue; // *** reprocess char32At(cursor)
}
}
break;
case 1: // after open delimiter
// Look for legal chars. If \s+ is found, convert it
// to a single space. If closeDelimiter is found, exit
// the loop. If any other character is found, exit the
// loop. If the limit is reached, exit the loop.
// Convert \s+ => SPACE. This assumes there are no
// runs of >1 space characters in names.
if (PatternProps.IsWhiteSpace(c))
{
// Ignore leading whitespace
if (name.Length > 0 &&
name[name.Length - 1] != SPACE)
{
name.Append(SPACE);
// If we are too long then abort. maxLen includes
// temporary trailing space, so use '>'.
if (name.Length > maxLen)
{
mode = 0;
}
}
break;
}
if (c == CLOSE_DELIM)
{
int len = name.Length;
// Delete trailing space, if any
if (len > 0 &&
name[len - 1] == SPACE)
{
name.Length = --len;
}
c = UCharacter.GetCharFromExtendedName(name.ToString());
if (c != -1)
{
// Lookup succeeded
// assert(UTF16.getCharCount(CLOSE_DELIM) == 1);
cursor++; // advance over CLOSE_DELIM
string str = UTF16.ValueOf(c);
text.Replace(openPos, cursor, str);
// Adjust indices for the change in the length of
// the string. Do not assume that str.length() ==
// 1, in case of surrogates.
int delta = cursor - openPos - str.Length;
cursor -= delta;
limit -= delta;
// assert(cursor == openPos + str.length());
}
// If the lookup failed, we leave things as-is and
// still switch to mode 0 and continue.
mode = 0;
openPos = -1; // close off candidate
continue; // *** reprocess char32At(cursor)
}
if (legal.Contains(c))
{
UTF16.Append(name, c);
// If we go past the longest possible name then abort.
// maxLen includes temporary trailing space, so use '>='.
if (name.Length >= maxLen)
{
mode = 0;
}
}
// Invalid character
else
{
--cursor; // Backup and reprocess this character
mode = 0;
}
break;
}
cursor += UTF16.GetCharCount(c);
}
offsets.ContextLimit += limit - offsets.Limit;
offsets.Limit = limit;
// In incremental mode, only advance the cursor up to the last
// open delimiter candidate.
offsets.Start = (isIncremental && openPos >= 0) ? openPos : cursor;
}
internal static int PosBefore(IReplaceable str, int pos)
{
return((pos > 0) ?
pos - UTF16.GetCharCount(str.Char32At(pos - 1)) :
pos - 1);
}
