com.ibm.icu.text.UTF16.isTrailSurrogate()方法的使用及代码示例
本文整理了Java中com.ibm.icu.text.UTF16.isTrailSurrogate()方法的一些代码示例，展示了UTF16.isTrailSurrogate()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。UTF16.isTrailSurrogate()方法的具体详情如下：
包路径：com.ibm.icu.text.UTF16
类名称：UTF16
方法名：isTrailSurrogate
UTF16.isTrailSurrogate介绍
[英]Determines whether the character is a trail surrogate.
[中]确定角色是否为轨迹代理。
代码示例
代码示例来源：origin: com.ibm.icu/icu4j-charset
private int getTrail(CharBuffer source, ByteBuffer target, IntBuffer offsets){
if(source.hasRemaining()){
/*test the following code unit*/
char trail = source.get(source.position());
if(UTF16.isTrailSurrogate(trail)){
source.position(source.position()+1);
++nextSourceIndex;
c=UCharacter.getCodePoint((char)c, trail);
}
} else {
/*no more input*/
c = -c; /*negative lead surrogate as "incomplete" indicator to avoid c=0 everywhere else*/
checkNegative = true;
}
LoopAfterTrail = true;
return regularLoop;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Does the set contain the next code point?
* If so, return its length; otherwise return its negative length.
*/
static int spanOne(final UnicodeSet set, CharSequence s, int start, int length) {
char c = s.charAt(start);
if (c >= 0xd800 && c <= 0xdbff && length >= 2) {
char c2 = s.charAt(start + 1);
if (com.ibm.icu.text.UTF16.isTrailSurrogate(c2)) {
int supplementary = Character.toCodePoint(c, c2);
return set.contains(supplementary) ? 2 : -2;
}
}
return set.contains(c) ? 1 : -1;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Reverses a UTF16 format Unicode string and replaces source's content with it. This method
* will reverse surrogate characters correctly, instead of blindly reversing every character.
* <p>
* Examples:<br>
* UTF16.reverse(new StringBuffer( "Supplementary characters \ud800\udc00\ud801\udc01"))<br>
* returns "\ud801\udc01\ud800\udc00 sretcarahc yratnemelppuS".
*
* @param source The source StringBuffer that contains UTF16 format Unicode string to be reversed
* @return a modified source with reversed UTF16 format Unicode string.
* @stable ICU 2.6
*/
public static StringBuffer reverse(StringBuffer source) {
int length = source.length();
StringBuffer result = new StringBuffer(length);
for (int i = length; i-- > 0;) {
char ch = source.charAt(i);
if (isTrailSurrogate(ch) && i > 0) {
char ch2 = source.charAt(i - 1);
if (isLeadSurrogate(ch2)) {
result.append(ch2);
result.append(ch);
--i;
continue;
}
}
result.append(ch);
}
return result;
}代码示例来源：origin: org.eclipse/org.eclipse.jem.util
/**
* Return the previous character from the one that was just returned.
* @return
*
* @since 1.2.0
*/
public int previous() {
if (!hasPrevious())
throw new IllegalStateException();
int next;
if (UTF16.isTrailSurrogate(charSeq.charAt(--pos))) {
if (pos > 0)
next = utfCharAt(--pos);
else
next = charSeq.charAt(pos);
} else {
next = charSeq.charAt(pos);
}
lastCharIndex = pos;
return next;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
ch = source[result];
if (isLeadSurrogate(ch) && ((result + 1) < limit)
&& isTrailSurrogate(source[result + 1])) {
result++;代码示例来源：origin: com.ibm.icu/icu4j-charset
private int getTrail(CharBuffer source, ByteBuffer target, IntBuffer offsets){
lead = (char)c;
int label = Loop;
if(source.hasRemaining()){
/*test the following code unit*/
trail = source.get(source.position());
if(UTF16.isTrailSurrogate(trail)){
source.position(source.position()+1);
++nextSourceIndex;
c = UCharacter.getCodePoint((char)c, trail);
label = Loop;
} else {
/*this is unmatched lead code unit (1st Surrogate)*/
/*callback(illegal)*/
cr = CoderResult.malformedForLength(1);
label = EndLoop;
}
}else {
/*no more input*/
label = EndLoop;
}
AfterGetTrail = true;
return label;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Get the value associated with a pair of surrogates.
* @param lead a lead surrogate
* @param trail a trail surrogate
*/
public final int getSurrogateValue(char lead, char trail)
{
if (!UTF16.isLeadSurrogate(lead) || !UTF16.isTrailSurrogate(trail)) {
throw new IllegalArgumentException(
"Argument characters do not form a supplementary character");
}
// get fold position for the next trail surrogate
int offset = getSurrogateOffset(lead, trail);
// get the real data from the folded lead/trail units
if (offset > 0) {
return m_data_[offset];
}
// return m_initialValue_ if there is an error
return m_initialValue_;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Set a code point into a UTF16 position. Adjusts target according if we are replacing a
* non-supplementary codepoint with a supplementary and vice versa.
*
* @param target Stringbuffer
* @param offset16 UTF16 position to insert into
* @param char32 Code point
* @stable ICU 2.1
*/
public static void setCharAt(StringBuffer target, int offset16, int char32) {
int count = 1;
char single = target.charAt(offset16);
if (isSurrogate(single)) {
// pairs of the surrogate with offset16 at the lead char found
if (isLeadSurrogate(single) && (target.length() > offset16 + 1)
&& isTrailSurrogate(target.charAt(offset16 + 1))) {
count++;
} else {
// pairs of the surrogate with offset16 at the trail char
// found
if (isTrailSurrogate(single) && (offset16 > 0)
&& isLeadSurrogate(target.charAt(offset16 - 1))) {
offset16--;
count++;
}
}
}
target.replace(offset16, offset16 + count, valueOf(char32));
}代码示例来源：origin: com.ibm.icu/icu4j-charset
private final boolean getTrailSingleBMP(CharBuffer source, SideEffectsSingleBMP x, CoderResult[] cr) {
if (x.sourceArrayIndex < source.limit()) {
/* test the following code unit */
char trail = source.get(x.sourceArrayIndex);
if (UTF16.isTrailSurrogate(trail)) {
++x.sourceArrayIndex;
x.c = UCharacter.getCodePoint((char) x.c, trail);
/* this codepage does not map supplementary code points */
/* callback(unassigned) */
cr[0] = CoderResult.unmappableForLength(2);
return false;
} else {
/* this is an unmatched lead code unit (1st surrogate) */
/* callback(illegal) */
cr[0] = CoderResult.malformedForLength(1);
return false;
}
} else {
/* no more input */
return false;
}
// return true;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Returns the UTF-16 offset that corresponds to a UTF-32 offset. Used for random access. See
* the {@link UTF16 class description} for notes on roundtripping.
*
* @param source The UTF-16 string
* @param offset32 UTF-32 offset
* @return UTF-16 offset
* @exception IndexOutOfBoundsException If offset32 is out of bounds.
* @stable ICU 2.1
*/
public static int findOffsetFromCodePoint(String source, int offset32) {
char ch;
int size = source.length(), result = 0, count = offset32;
if (offset32 < 0 || offset32 > size) {
throw new StringIndexOutOfBoundsException(offset32);
}
while (result < size && count > 0) {
ch = source.charAt(result);
if (isLeadSurrogate(ch) && ((result + 1) < size)
&& isTrailSurrogate(source.charAt(result + 1))) {
result++;
}
count--;
result++;
}
if (count != 0) {
throw new StringIndexOutOfBoundsException(offset32);
}
return result;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Returns the UTF-16 offset that corresponds to a UTF-32 offset. Used for random access. See
* the {@link UTF16 class description} for notes on roundtripping.
*
* @param source The UTF-16 string buffer
* @param offset32 UTF-32 offset
* @return UTF-16 offset
* @exception IndexOutOfBoundsException If offset32 is out of bounds.
* @stable ICU 2.1
*/
public static int findOffsetFromCodePoint(StringBuffer source, int offset32) {
char ch;
int size = source.length(), result = 0, count = offset32;
if (offset32 < 0 || offset32 > size) {
throw new StringIndexOutOfBoundsException(offset32);
}
while (result < size && count > 0) {
ch = source.charAt(result);
if (isLeadSurrogate(ch) && ((result + 1) < size)
&& isTrailSurrogate(source.charAt(result + 1))) {
result++;
}
count--;
result++;
}
if (count != 0) {
throw new StringIndexOutOfBoundsException(offset32);
}
return result;
}代码示例来源：origin: com.ibm.icu/icu4j-charset
private final boolean getTrailDouble(CharBuffer source, ByteBuffer target, int uniMask,
SideEffectsDouble x, boolean flush, CoderResult[] cr) {
if (x.sourceArrayIndex < source.limit()) {
/* test the following code unit */
char trail = source.get(x.sourceArrayIndex);
if (UTF16.isTrailSurrogate(trail)) {
++x.sourceArrayIndex;
++x.nextSourceIndex;
/* convert this supplementary code point */
x.c = UCharacter.getCodePoint((char) x.c, trail);
if ((uniMask & UConverterConstants.HAS_SUPPLEMENTARY) == 0) {
/* BMP-only codepages are stored without stage 1 entries for supplementary code points */
/* callback(unassigned) */
x.doread = true;
return unassignedDouble(source, target, x, flush, cr);
} else {
x.doread = false;
return true;
}
} else {
/* this is an unmatched lead code unit (1st surrogate) */
/* callback(illegal) */
cr[0] = CoderResult.malformedForLength(1);
return false;
}
} else {
/* no more input */
return false;
}
}代码示例来源：origin: com.ibm.icu/icu4j-charset
if (UTF16.isTrailSurrogate(trail)) {
++x.sourceArrayIndex;
++x.nextSourceIndex;代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Returns the code point at index, and increments to the next code point (post-increment semantics). If index does
* not point to a valid surrogate pair, the behavior is the same as <code>next()</code>. Otherwise the iterator is
* incremented past the surrogate pair, and the code point represented by the pair is returned.
*
* @return the next codepoint in text, or DONE if the index is at the limit of the text.
* @stable ICU 2.4
*/
@Override
public int nextCodePoint() {
int ch1 = next();
if (UTF16.isLeadSurrogate((char) ch1)) {
int ch2 = next();
if (UTF16.isTrailSurrogate((char) ch2)) {
return Character.toCodePoint((char) ch1, (char) ch2);
} else if (ch2 != DONE) {
// unmatched surrogate so back out
previous();
}
}
return ch1;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Retreat to the start of the previous code point in the text, and return it (pre-decrement semantics). If the
* index is not preceeded by a valid surrogate pair, the behavior is the same as <code>previous()</code>. Otherwise
* the iterator is decremented to the start of the surrogate pair, and the code point represented by the pair is
* returned.
*
* @return the previous code point in the text, or DONE if the new index is before the start of the text.
* @stable ICU 2.4
*/
public int previousCodePoint() {
int ch1 = previous();
if (UTF16.isTrailSurrogate((char) ch1)) {
int ch2 = previous();
if (UTF16.isLeadSurrogate((char) ch2)) {
return Character.toCodePoint((char) ch2, (char) ch1);
} else if (ch2 != DONE) {
// unmatched trail surrogate so back out
next();
}
}
return ch1;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
public static int nextTrail32(CharacterIterator ci, int lead) {
if (lead == CharacterIterator.DONE && ci.getIndex() >= ci.getEndIndex()) {
return DONE32;
}
int retVal = lead;
if (lead <= UTF16.LEAD_SURROGATE_MAX_VALUE) {
char cTrail = ci.next();
if (UTF16.isTrailSurrogate(cTrail)) {
retVal = ((lead - UTF16.LEAD_SURROGATE_MIN_VALUE) << 10) +
(cTrail - UTF16.TRAIL_SURROGATE_MIN_VALUE) +
UTF16.SUPPLEMENTARY_MIN_VALUE;
} else {
ci.previous();
}
}
return retVal;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Returns the current codepoint
* @return current codepoint
*/
@Override
public int currentCodePoint(){
// cannot use charAt due to it different
// behaviour when index is pointing at a
// trail surrogate, check for surrogates
int ch = current();
if(UTF16.isLeadSurrogate((char)ch)){
// advance the index to get the next code point
next();
// due to post increment semantics current() after next()
// actually returns the next char which is what we want
int ch2 = current();
// current should never change the current index so back off
previous();
if(UTF16.isTrailSurrogate((char)ch2)){
// we found a surrogate pair
return Character.toCodePoint((char)ch, (char)ch2);
}
}
return ch;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
/**
* Returns the codepoint at the current index. If the current index is invalid, DONE is returned. If the current
* index points to a lead surrogate, and there is a following trail surrogate, then the code point is returned.
* Otherwise, the code unit at index is returned. Index is not changed.
*
* @return current codepoint
* @stable ICU 2.4
*/
public int currentCodePoint() {
int ch = current();
if (UTF16.isLeadSurrogate((char) ch)) {
// advance the index to get the
// next code point
next();
// due to post increment semantics
// current() after next() actually
// returns the char we want
int ch2 = current();
// current should never change
// the current index so back off
previous();
if (UTF16.isTrailSurrogate((char) ch2)) {
// we found a surrogate pair
// return the codepoint
return Character.toCodePoint((char) ch, (char) ch2);
}
}
return ch;
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
public static int current32(CharacterIterator ci) {
char lead = ci.current();
int retVal = lead;
if (retVal < UTF16.LEAD_SURROGATE_MIN_VALUE) {
return retVal;
}
if (UTF16.isLeadSurrogate(lead)) {
int trail = (int)ci.next();
ci.previous();
if (UTF16.isTrailSurrogate((char)trail)) {
retVal = ((lead - UTF16.LEAD_SURROGATE_MIN_VALUE) << 10) +
(trail - UTF16.TRAIL_SURROGATE_MIN_VALUE) +
UTF16.SUPPLEMENTARY_MIN_VALUE;
}
} else {
if (lead == CharacterIterator.DONE) {
if (ci.getIndex() >= ci.getEndIndex()) {
retVal = DONE32;
}
}
}
return retVal;
}
}代码示例来源：origin: io.virtdata/virtdata-lib-realer
public static int previous32(CharacterIterator ci) {
if (ci.getIndex() <= ci.getBeginIndex()) {
return DONE32;
}
char trail = ci.previous();
int retVal = trail;
if (UTF16.isTrailSurrogate(trail) && ci.getIndex()>ci.getBeginIndex()) {
char lead = ci.previous();
if (UTF16.isLeadSurrogate(lead)) {
retVal = (((int)lead - UTF16.LEAD_SURROGATE_MIN_VALUE) << 10) +
((int)trail - UTF16.TRAIL_SURROGATE_MIN_VALUE) +
UTF16.SUPPLEMENTARY_MIN_VALUE;
} else {
ci.next();
}
}
return retVal;
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