Java example source code file (NormalizerBase.java)
The NormalizerBase.java Java example source code
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package sun.text.normalizer;
import java.text.CharacterIterator;
import java.text.Normalizer;
/**
* Unicode Normalization
*
* <h2>Unicode normalization API
*
* <code>normalize transforms Unicode text into an equivalent composed or
* decomposed form, allowing for easier sorting and searching of text.
* <code>normalize supports the standard normalization forms described in
* <a href="http://www.unicode.org/unicode/reports/tr15/" target="unicode">
* Unicode Standard Annex #15 — Unicode Normalization Forms</a>.
*
* Characters with accents or other adornments can be encoded in
* several different ways in Unicode. For example, take the character A-acute.
* In Unicode, this can be encoded as a single character (the
* "composed" form):
*
* <p>
* 00C1 LATIN CAPITAL LETTER A WITH ACUTE
* </p>
*
* or as two separate characters (the "decomposed" form):
*
* <p>
* 0041 LATIN CAPITAL LETTER A
* 0301 COMBINING ACUTE ACCENT
* </p>
*
* To a user of your program, however, both of these sequences should be
* treated as the same "user-level" character "A with acute accent". When you
* are searching or comparing text, you must ensure that these two sequences are
* treated equivalently. In addition, you must handle characters with more than
* one accent. Sometimes the order of a character's combining accents is
* significant, while in other cases accent sequences in different orders are
* really equivalent.
*
* Similarly, the string "ffi" can be encoded as three separate letters:
*
* <p>
* 0066 LATIN SMALL LETTER F
* 0066 LATIN SMALL LETTER F
* 0069 LATIN SMALL LETTER I
* </p>
*
* or as the single character
*
* <p>
* FB03 LATIN SMALL LIGATURE FFI
* </p>
*
* The ffi ligature is not a distinct semantic character, and strictly speaking
* it shouldn't be in Unicode at all, but it was included for compatibility
* with existing character sets that already provided it. The Unicode standard
* identifies such characters by giving them "compatibility" decompositions
* into the corresponding semantic characters. When sorting and searching, you
* will often want to use these mappings.
*
* <code>normalize helps solve these problems by transforming text into
* the canonical composed and decomposed forms as shown in the first example
* above. In addition, you can have it perform compatibility decompositions so
* that you can treat compatibility characters the same as their equivalents.
* Finally, <code>normalize rearranges accents into the proper canonical
* order, so that you do not have to worry about accent rearrangement on your
* own.
*
* Form FCD, "Fast C or D", is also designed for collation.
* It allows to work on strings that are not necessarily normalized
* with an algorithm (like in collation) that works under "canonical closure",
* i.e., it treats precomposed characters and their decomposed equivalents the
* same.
*
* It is not a normalization form because it does not provide for uniqueness of
* representation. Multiple strings may be canonically equivalent (their NFDs
* are identical) and may all conform to FCD without being identical themselves.
*
* The form is defined such that the "raw decomposition", the recursive
* canonical decomposition of each character, results in a string that is
* canonically ordered. This means that precomposed characters are allowed for
* as long as their decompositions do not need canonical reordering.
*
* Its advantage for a process like collation is that all NFD and most NFC texts
* - and many unnormalized texts - already conform to FCD and do not need to be
* normalized (NFD) for such a process. The FCD quick check will return YES for
* most strings in practice.
*
* normalize(FCD) may be implemented with NFD.
*
* For more details on FCD see the collation design document:
* http://source.icu-project.org/repos/icu/icuhtml/trunk/design/collation/ICU_collation_design.htm
*
* ICU collation performs either NFD or FCD normalization automatically if
* normalization is turned on for the collator object. Beyond collation and
* string search, normalized strings may be useful for string equivalence
* comparisons, transliteration/transcription, unique representations, etc.
*
* The W3C generally recommends to exchange texts in NFC.
* Note also that most legacy character encodings use only precomposed forms and
* often do not encode any combining marks by themselves. For conversion to such
* character encodings the Unicode text needs to be normalized to NFC.
* For more usage examples, see the Unicode Standard Annex.
* @stable ICU 2.8
*/
public final class NormalizerBase implements Cloneable {
//-------------------------------------------------------------------------
// Private data
//-------------------------------------------------------------------------
private char[] buffer = new char[100];
private int bufferStart = 0;
private int bufferPos = 0;
private int bufferLimit = 0;
// The input text and our position in it
private UCharacterIterator text;
private Mode mode = NFC;
private int options = 0;
private int currentIndex;
private int nextIndex;
/**
* Options bit set value to select Unicode 3.2 normalization
* (except NormalizationCorrections).
* At most one Unicode version can be selected at a time.
* @stable ICU 2.6
*/
public static final int UNICODE_3_2=0x20;
/**
* Constant indicating that the end of the iteration has been reached.
* This is guaranteed to have the same value as {@link UCharacterIterator#DONE}.
* @stable ICU 2.8
*/
public static final int DONE = UCharacterIterator.DONE;
/**
* Constants for normalization modes.
* @stable ICU 2.8
*/
public static class Mode {
private int modeValue;
private Mode(int value) {
modeValue = value;
}
/**
* This method is used for method dispatch
* @stable ICU 2.6
*/
protected int normalize(char[] src, int srcStart, int srcLimit,
char[] dest,int destStart,int destLimit,
UnicodeSet nx) {
int srcLen = (srcLimit - srcStart);
int destLen = (destLimit - destStart);
if( srcLen > destLen ) {
return srcLen;
}
System.arraycopy(src,srcStart,dest,destStart,srcLen);
return srcLen;
}
/**
* This method is used for method dispatch
* @stable ICU 2.6
*/
protected int normalize(char[] src, int srcStart, int srcLimit,
char[] dest,int destStart,int destLimit,
int options) {
return normalize( src, srcStart, srcLimit,
dest,destStart,destLimit,
NormalizerImpl.getNX(options)
);
}
/**
* This method is used for method dispatch
* @stable ICU 2.6
*/
protected String normalize(String src, int options) {
return src;
}
/**
* This method is used for method dispatch
* @stable ICU 2.8
*/
protected int getMinC() {
return -1;
}
/**
* This method is used for method dispatch
* @stable ICU 2.8
*/
protected int getMask() {
return -1;
}
/**
* This method is used for method dispatch
* @stable ICU 2.8
*/
protected IsPrevBoundary getPrevBoundary() {
return null;
}
/**
* This method is used for method dispatch
* @stable ICU 2.8
*/
protected IsNextBoundary getNextBoundary() {
return null;
}
/**
* This method is used for method dispatch
* @stable ICU 2.6
*/
protected QuickCheckResult quickCheck(char[] src,int start, int limit,
boolean allowMaybe,UnicodeSet nx) {
if(allowMaybe) {
return MAYBE;
}
return NO;
}
/**
* This method is used for method dispatch
* @stable ICU 2.8
*/
protected boolean isNFSkippable(int c) {
return true;
}
}
/**
* No decomposition/composition.
* @stable ICU 2.8
*/
public static final Mode NONE = new Mode(1);
/**
* Canonical decomposition.
* @stable ICU 2.8
*/
public static final Mode NFD = new NFDMode(2);
private static final class NFDMode extends Mode {
private NFDMode(int value) {
super(value);
}
protected int normalize(char[] src, int srcStart, int srcLimit,
char[] dest,int destStart,int destLimit,
UnicodeSet nx) {
int[] trailCC = new int[1];
return NormalizerImpl.decompose(src, srcStart,srcLimit,
dest, destStart,destLimit,
false, trailCC,nx);
}
protected String normalize( String src, int options) {
return decompose(src,false,options);
}
protected int getMinC() {
return NormalizerImpl.MIN_WITH_LEAD_CC;
}
protected IsPrevBoundary getPrevBoundary() {
return new IsPrevNFDSafe();
}
protected IsNextBoundary getNextBoundary() {
return new IsNextNFDSafe();
}
protected int getMask() {
return (NormalizerImpl.CC_MASK|NormalizerImpl.QC_NFD);
}
protected QuickCheckResult quickCheck(char[] src,int start,
int limit,boolean allowMaybe,
UnicodeSet nx) {
return NormalizerImpl.quickCheck(
src, start,limit,
NormalizerImpl.getFromIndexesArr(
NormalizerImpl.INDEX_MIN_NFD_NO_MAYBE
),
NormalizerImpl.QC_NFD,
0,
allowMaybe,
nx
);
}
protected boolean isNFSkippable(int c) {
return NormalizerImpl.isNFSkippable(c,this,
(NormalizerImpl.CC_MASK|NormalizerImpl.QC_NFD)
);
}
}
/**
* Compatibility decomposition.
* @stable ICU 2.8
*/
public static final Mode NFKD = new NFKDMode(3);
private static final class NFKDMode extends Mode {
private NFKDMode(int value) {
super(value);
}
protected int normalize(char[] src, int srcStart, int srcLimit,
char[] dest,int destStart,int destLimit,
UnicodeSet nx) {
int[] trailCC = new int[1];
return NormalizerImpl.decompose(src, srcStart,srcLimit,
dest, destStart,destLimit,
true, trailCC, nx);
}
protected String normalize( String src, int options) {
return decompose(src,true,options);
}
protected int getMinC() {
return NormalizerImpl.MIN_WITH_LEAD_CC;
}
protected IsPrevBoundary getPrevBoundary() {
return new IsPrevNFDSafe();
}
protected IsNextBoundary getNextBoundary() {
return new IsNextNFDSafe();
}
protected int getMask() {
return (NormalizerImpl.CC_MASK|NormalizerImpl.QC_NFKD);
}
protected QuickCheckResult quickCheck(char[] src,int start,
int limit,boolean allowMaybe,
UnicodeSet nx) {
return NormalizerImpl.quickCheck(
src,start,limit,
NormalizerImpl.getFromIndexesArr(
NormalizerImpl.INDEX_MIN_NFKD_NO_MAYBE
),
NormalizerImpl.QC_NFKD,
NormalizerImpl.OPTIONS_COMPAT,
allowMaybe,
nx
);
}
protected boolean isNFSkippable(int c) {
return NormalizerImpl.isNFSkippable(c, this,
(NormalizerImpl.CC_MASK|NormalizerImpl.QC_NFKD)
);
}
}
/**
* Canonical decomposition followed by canonical composition.
* @stable ICU 2.8
*/
public static final Mode NFC = new NFCMode(4);
private static final class NFCMode extends Mode{
private NFCMode(int value) {
super(value);
}
protected int normalize(char[] src, int srcStart, int srcLimit,
char[] dest,int destStart,int destLimit,
UnicodeSet nx) {
return NormalizerImpl.compose( src, srcStart, srcLimit,
dest,destStart,destLimit,
0, nx);
}
protected String normalize( String src, int options) {
return compose(src, false, options);
}
protected int getMinC() {
return NormalizerImpl.getFromIndexesArr(
NormalizerImpl.INDEX_MIN_NFC_NO_MAYBE
);
}
protected IsPrevBoundary getPrevBoundary() {
return new IsPrevTrueStarter();
}
protected IsNextBoundary getNextBoundary() {
return new IsNextTrueStarter();
}
protected int getMask() {
return (NormalizerImpl.CC_MASK|NormalizerImpl.QC_NFC);
}
protected QuickCheckResult quickCheck(char[] src,int start,
int limit,boolean allowMaybe,
UnicodeSet nx) {
return NormalizerImpl.quickCheck(
src,start,limit,
NormalizerImpl.getFromIndexesArr(
NormalizerImpl.INDEX_MIN_NFC_NO_MAYBE
),
NormalizerImpl.QC_NFC,
0,
allowMaybe,
nx
);
}
protected boolean isNFSkippable(int c) {
return NormalizerImpl.isNFSkippable(c,this,
( NormalizerImpl.CC_MASK|NormalizerImpl.COMBINES_ANY|
(NormalizerImpl.QC_NFC & NormalizerImpl.QC_ANY_NO)
)
);
}
};
/**
* Compatibility decomposition followed by canonical composition.
* @stable ICU 2.8
*/
public static final Mode NFKC =new NFKCMode(5);
private static final class NFKCMode extends Mode{
private NFKCMode(int value) {
super(value);
}
protected int normalize(char[] src, int srcStart, int srcLimit,
char[] dest,int destStart,int destLimit,
UnicodeSet nx) {
return NormalizerImpl.compose(src, srcStart,srcLimit,
dest, destStart,destLimit,
NormalizerImpl.OPTIONS_COMPAT, nx);
}
protected String normalize( String src, int options) {
return compose(src, true, options);
}
protected int getMinC() {
return NormalizerImpl.getFromIndexesArr(
NormalizerImpl.INDEX_MIN_NFKC_NO_MAYBE
);
}
protected IsPrevBoundary getPrevBoundary() {
return new IsPrevTrueStarter();
}
protected IsNextBoundary getNextBoundary() {
return new IsNextTrueStarter();
}
protected int getMask() {
return (NormalizerImpl.CC_MASK|NormalizerImpl.QC_NFKC);
}
protected QuickCheckResult quickCheck(char[] src,int start,
int limit,boolean allowMaybe,
UnicodeSet nx) {
return NormalizerImpl.quickCheck(
src,start,limit,
NormalizerImpl.getFromIndexesArr(
NormalizerImpl.INDEX_MIN_NFKC_NO_MAYBE
),
NormalizerImpl.QC_NFKC,
NormalizerImpl.OPTIONS_COMPAT,
allowMaybe,
nx
);
}
protected boolean isNFSkippable(int c) {
return NormalizerImpl.isNFSkippable(c, this,
( NormalizerImpl.CC_MASK|NormalizerImpl.COMBINES_ANY|
(NormalizerImpl.QC_NFKC & NormalizerImpl.QC_ANY_NO)
)
);
}
};
/**
* Result values for quickCheck().
* For details see Unicode Technical Report 15.
* @stable ICU 2.8
*/
public static final class QuickCheckResult{
private int resultValue;
private QuickCheckResult(int value) {
resultValue=value;
}
}
/**
* Indicates that string is not in the normalized format
* @stable ICU 2.8
*/
public static final QuickCheckResult NO = new QuickCheckResult(0);
/**
* Indicates that string is in the normalized format
* @stable ICU 2.8
*/
public static final QuickCheckResult YES = new QuickCheckResult(1);
/**
* Indicates it cannot be determined if string is in the normalized
* format without further thorough checks.
* @stable ICU 2.8
*/
public static final QuickCheckResult MAYBE = new QuickCheckResult(2);
//-------------------------------------------------------------------------
// Constructors
//-------------------------------------------------------------------------
/**
* Creates a new <tt>Normalizer object for iterating over the
* normalized form of a given string.
* <p>
* The <tt>options parameter specifies which optional
* <tt>Normalizer features are to be enabled for this object.
* <p>
* @param str The string to be normalized. The normalization
* will start at the beginning of the string.
*
* @param mode The normalization mode.
*
* @param opt Any optional features to be enabled.
* Currently the only available option is {@link #UNICODE_3_2}.
* If you want the default behavior corresponding to one of the
* standard Unicode Normalization Forms, use 0 for this argument.
* @stable ICU 2.6
*/
public NormalizerBase(String str, Mode mode, int opt) {
this.text = UCharacterIterator.getInstance(str);
this.mode = mode;
this.options=opt;
}
/**
* Creates a new <tt>Normalizer object for iterating over the
* normalized form of the given text.
* <p>
* @param iter The input text to be normalized. The normalization
* will start at the beginning of the string.
*
* @param mode The normalization mode.
*/
public NormalizerBase(CharacterIterator iter, Mode mode) {
this(iter, mode, UNICODE_LATEST);
}
/**
* Creates a new <tt>Normalizer object for iterating over the
* normalized form of the given text.
* <p>
* @param iter The input text to be normalized. The normalization
* will start at the beginning of the string.
*
* @param mode The normalization mode.
*
* @param opt Any optional features to be enabled.
* Currently the only available option is {@link #UNICODE_3_2}.
* If you want the default behavior corresponding to one of the
* standard Unicode Normalization Forms, use 0 for this argument.
* @stable ICU 2.6
*/
public NormalizerBase(CharacterIterator iter, Mode mode, int opt) {
this.text = UCharacterIterator.getInstance(
(CharacterIterator)iter.clone()
);
this.mode = mode;
this.options = opt;
}
/**
* Clones this <tt>Normalizer object. All properties of this
* object are duplicated in the new object, including the cloning of any
* {@link CharacterIterator} that was passed in to the constructor
* or to {@link #setText(CharacterIterator) setText}.
* However, the text storage underlying
* the <tt>CharacterIterator is not duplicated unless the
* iterator's <tt>clone method does so.
* @stable ICU 2.8
*/
public Object clone() {
try {
NormalizerBase copy = (NormalizerBase) super.clone();
copy.text = (UCharacterIterator) text.clone();
//clone the internal buffer
if (buffer != null) {
copy.buffer = new char[buffer.length];
System.arraycopy(buffer,0,copy.buffer,0,buffer.length);
}
return copy;
}
catch (CloneNotSupportedException e) {
throw new InternalError(e.toString(), e);
}
}
//--------------------------------------------------------------------------
// Static Utility methods
//--------------------------------------------------------------------------
/**
* Compose a string.
* The string will be composed to according the the specified mode.
* @param str The string to compose.
* @param compat If true the string will be composed accoding to
* NFKC rules and if false will be composed according to
* NFC rules.
* @param options The only recognized option is UNICODE_3_2
* @return String The composed string
* @stable ICU 2.6
*/
public static String compose(String str, boolean compat, int options) {
char[] dest, src;
if (options == UNICODE_3_2_0_ORIGINAL) {
String mappedStr = NormalizerImpl.convert(str);
dest = new char[mappedStr.length()*MAX_BUF_SIZE_COMPOSE];
src = mappedStr.toCharArray();
} else {
dest = new char[str.length()*MAX_BUF_SIZE_COMPOSE];
src = str.toCharArray();
}
int destSize=0;
UnicodeSet nx = NormalizerImpl.getNX(options);
/* reset options bits that should only be set here or inside compose() */
options&=~(NormalizerImpl.OPTIONS_SETS_MASK|NormalizerImpl.OPTIONS_COMPAT|NormalizerImpl.OPTIONS_COMPOSE_CONTIGUOUS);
if(compat) {
options|=NormalizerImpl.OPTIONS_COMPAT;
}
for(;;) {
destSize=NormalizerImpl.compose(src,0,src.length,
dest,0,dest.length,options,
nx);
if(destSize<=dest.length) {
return new String(dest,0,destSize);
} else {
dest = new char[destSize];
}
}
}
private static final int MAX_BUF_SIZE_COMPOSE = 2;
private static final int MAX_BUF_SIZE_DECOMPOSE = 3;
/**
* Decompose a string.
* The string will be decomposed to according the the specified mode.
* @param str The string to decompose.
* @param compat If true the string will be decomposed accoding to NFKD
* rules and if false will be decomposed according to NFD
* rules.
* @return String The decomposed string
* @stable ICU 2.8
*/
public static String decompose(String str, boolean compat) {
return decompose(str,compat,UNICODE_LATEST);
}
/**
* Decompose a string.
* The string will be decomposed to according the the specified mode.
* @param str The string to decompose.
* @param compat If true the string will be decomposed accoding to NFKD
* rules and if false will be decomposed according to NFD
* rules.
* @param options The normalization options, ORed together (0 for no options).
* @return String The decomposed string
* @stable ICU 2.6
*/
public static String decompose(String str, boolean compat, int options) {
int[] trailCC = new int[1];
int destSize=0;
UnicodeSet nx = NormalizerImpl.getNX(options);
char[] dest;
if (options == UNICODE_3_2_0_ORIGINAL) {
String mappedStr = NormalizerImpl.convert(str);
dest = new char[mappedStr.length()*MAX_BUF_SIZE_DECOMPOSE];
for(;;) {
destSize=NormalizerImpl.decompose(mappedStr.toCharArray(),0,mappedStr.length(),
dest,0,dest.length,
compat,trailCC, nx);
if(destSize<=dest.length) {
return new String(dest,0,destSize);
} else {
dest = new char[destSize];
}
}
} else {
dest = new char[str.length()*MAX_BUF_SIZE_DECOMPOSE];
for(;;) {
destSize=NormalizerImpl.decompose(str.toCharArray(),0,str.length(),
dest,0,dest.length,
compat,trailCC, nx);
if(destSize<=dest.length) {
return new String(dest,0,destSize);
} else {
dest = new char[destSize];
}
}
}
}
/**
* Normalize a string.
* The string will be normalized according the the specified normalization
* mode and options.
* @param src The char array to compose.
* @param srcStart Start index of the source
* @param srcLimit Limit index of the source
* @param dest The char buffer to fill in
* @param destStart Start index of the destination buffer
* @param destLimit End index of the destination buffer
* @param mode The normalization mode; one of Normalizer.NONE,
* Normalizer.NFD, Normalizer.NFC, Normalizer.NFKC,
* Normalizer.NFKD, Normalizer.DEFAULT
* @param options The normalization options, ORed together (0 for no options).
* @return int The total buffer size needed;if greater than length of
* result, the output was truncated.
* @exception IndexOutOfBoundsException if the target capacity is
* less than the required length
* @stable ICU 2.6
*/
public static int normalize(char[] src,int srcStart, int srcLimit,
char[] dest,int destStart, int destLimit,
Mode mode, int options) {
int length = mode.normalize(src,srcStart,srcLimit,dest,destStart,destLimit, options);
if(length<=(destLimit-destStart)) {
return length;
} else {
throw new IndexOutOfBoundsException(Integer.toString(length));
}
}
//-------------------------------------------------------------------------
// Iteration API
//-------------------------------------------------------------------------
/**
* Return the current character in the normalized text->
* @return The codepoint as an int
* @stable ICU 2.8
*/
public int current() {
if(bufferPos<bufferLimit || nextNormalize()) {
return getCodePointAt(bufferPos);
} else {
return DONE;
}
}
/**
* Return the next character in the normalized text and advance
* the iteration position by one. If the end
* of the text has already been reached, {@link #DONE} is returned.
* @return The codepoint as an int
* @stable ICU 2.8
*/
public int next() {
if(bufferPos<bufferLimit || nextNormalize()) {
int c=getCodePointAt(bufferPos);
bufferPos+=(c>0xFFFF) ? 2 : 1;
return c;
} else {
return DONE;
}
}
/**
* Return the previous character in the normalized text and decrement
* the iteration position by one. If the beginning
* of the text has already been reached, {@link #DONE} is returned.
* @return The codepoint as an int
* @stable ICU 2.8
*/
public int previous() {
if(bufferPos>0 || previousNormalize()) {
int c=getCodePointAt(bufferPos-1);
bufferPos-=(c>0xFFFF) ? 2 : 1;
return c;
} else {
return DONE;
}
}
/**
* Reset the index to the beginning of the text.
* This is equivalent to setIndexOnly(startIndex)).
* @stable ICU 2.8
*/
public void reset() {
text.setIndex(0);
currentIndex=nextIndex=0;
clearBuffer();
}
/**
* Set the iteration position in the input text that is being normalized,
* without any immediate normalization.
* After setIndexOnly(), getIndex() will return the same index that is
* specified here.
*
* @param index the desired index in the input text.
* @stable ICU 2.8
*/
public void setIndexOnly(int index) {
text.setIndex(index);
currentIndex=nextIndex=index; // validates index
clearBuffer();
}
/**
* Set the iteration position in the input text that is being normalized
* and return the first normalized character at that position.
* <p>
* <b>Note: This method sets the position in the input text,
* while {@link #next} and {@link #previous} iterate through characters
* in the normalized <em>output. This means that there is not
* necessarily a one-to-one correspondence between characters returned
* by <tt>next and previous and the indices passed to and
* returned from <tt>setIndex and {@link #getIndex}.
* <p>
* @param index the desired index in the input text->
*
* @return the first normalized character that is the result of iterating
* forward starting at the given index.
*
* @throws IllegalArgumentException if the given index is less than
* {@link #getBeginIndex} or greater than {@link #getEndIndex}.
* @return The codepoint as an int
* @deprecated ICU 3.2
* @obsolete ICU 3.2
*/
@Deprecated
public int setIndex(int index) {
setIndexOnly(index);
return current();
}
/**
* Retrieve the index of the start of the input text. This is the begin
* index of the <tt>CharacterIterator or the start (i.e. 0) of the
* <tt>String over which this Normalizer is iterating
* @deprecated ICU 2.2. Use startIndex() instead.
* @return The codepoint as an int
* @see #startIndex
*/
@Deprecated
public int getBeginIndex() {
return 0;
}
/**
* Retrieve the index of the end of the input text. This is the end index
* of the <tt>CharacterIterator or the length of the String
* over which this <tt>Normalizer is iterating
* @deprecated ICU 2.2. Use endIndex() instead.
* @return The codepoint as an int
* @see #endIndex
*/
@Deprecated
public int getEndIndex() {
return endIndex();
}
/**
* Retrieve the current iteration position in the input text that is
* being normalized. This method is useful in applications such as
* searching, where you need to be able to determine the position in
* the input text that corresponds to a given normalized output character.
* <p>
* <b>Note: This method sets the position in the input, while
* {@link #next} and {@link #previous} iterate through characters in the
* <em>output. This means that there is not necessarily a one-to-one
* correspondence between characters returned by <tt>next and
* <tt>previous and the indices passed to and returned from
* <tt>setIndex and {@link #getIndex}.
* @return The current iteration position
* @stable ICU 2.8
*/
public int getIndex() {
if(bufferPos<bufferLimit) {
return currentIndex;
} else {
return nextIndex;
}
}
/**
* Retrieve the index of the end of the input text-> This is the end index
* of the <tt>CharacterIterator or the length of the String
* over which this <tt>Normalizer is iterating
* @return The current iteration position
* @stable ICU 2.8
*/
public int endIndex() {
return text.getLength();
}
//-------------------------------------------------------------------------
// Property access methods
//-------------------------------------------------------------------------
/**
* Set the normalization mode for this object.
* <p>
* <b>Note:If the normalization mode is changed while iterating
* over a string, calls to {@link #next} and {@link #previous} may
* return previously buffers characters in the old normalization mode
* until the iteration is able to re-sync at the next base character.
* It is safest to call {@link #setText setText()}, {@link #first},
* {@link #last}, etc. after calling <tt>setMode.
* <p>
* @param newMode the new mode for this <tt>Normalizer.
* The supported modes are:
* <ul>
* <li>{@link #COMPOSE} - Unicode canonical decompositiion
* followed by canonical composition.
* <li>{@link #COMPOSE_COMPAT} - Unicode compatibility decompositiion
* follwed by canonical composition.
* <li>{@link #DECOMP} - Unicode canonical decomposition
* <li>{@link #DECOMP_COMPAT} - Unicode compatibility decomposition.
* <li>{@link #NO_OP} - Do nothing but return characters
* from the underlying input text.
* </ul>
*
* @see #getMode
* @stable ICU 2.8
*/
public void setMode(Mode newMode) {
mode = newMode;
}
/**
* Return the basic operation performed by this <tt>Normalizer
*
* @see #setMode
* @stable ICU 2.8
*/
public Mode getMode() {
return mode;
}
/**
* Set the input text over which this <tt>Normalizer will iterate.
* The iteration position is set to the beginning of the input text->
* @param newText The new string to be normalized.
* @stable ICU 2.8
*/
public void setText(String newText) {
UCharacterIterator newIter = UCharacterIterator.getInstance(newText);
if (newIter == null) {
throw new InternalError("Could not create a new UCharacterIterator");
}
text = newIter;
reset();
}
/**
* Set the input text over which this <tt>Normalizer will iterate.
* The iteration position is set to the beginning of the input text->
* @param newText The new string to be normalized.
* @stable ICU 2.8
*/
public void setText(CharacterIterator newText) {
UCharacterIterator newIter = UCharacterIterator.getInstance(newText);
if (newIter == null) {
throw new InternalError("Could not create a new UCharacterIterator");
}
text = newIter;
currentIndex=nextIndex=0;
clearBuffer();
}
//-------------------------------------------------------------------------
// Private utility methods
//-------------------------------------------------------------------------
/* backward iteration --------------------------------------------------- */
/*
* read backwards and get norm32
* return 0 if the character is <minC
* if c2!=0 then (c2, c) is a surrogate pair (reversed - c2 is first
* surrogate but read second!)
*/
private static long getPrevNorm32(UCharacterIterator src,
int/*unsigned*/ minC,
int/*unsigned*/ mask,
char[] chars) {
long norm32;
int ch=0;
/* need src.hasPrevious() */
if((ch=src.previous()) == UCharacterIterator.DONE) {
return 0;
}
chars[0]=(char)ch;
chars[1]=0;
/* check for a surrogate before getting norm32 to see if we need to
* predecrement further */
if(chars[0]<minC) {
return 0;
} else if(!UTF16.isSurrogate(chars[0])) {
return NormalizerImpl.getNorm32(chars[0]);
} else if(UTF16.isLeadSurrogate(chars[0]) || (src.getIndex()==0)) {
/* unpaired surrogate */
chars[1]=(char)src.current();
return 0;
} else if(UTF16.isLeadSurrogate(chars[1]=(char)src.previous())) {
norm32=NormalizerImpl.getNorm32(chars[1]);
if((norm32&mask)==0) {
/* all surrogate pairs with this lead surrogate have irrelevant
* data */
return 0;
} else {
/* norm32 must be a surrogate special */
return NormalizerImpl.getNorm32FromSurrogatePair(norm32,chars[0]);
}
} else {
/* unpaired second surrogate, undo the c2=src.previous() movement */
src.moveIndex( 1);
return 0;
}
}
private interface IsPrevBoundary{
public boolean isPrevBoundary(UCharacterIterator src,
int/*unsigned*/ minC,
int/*unsigned*/ mask,
char[] chars);
}
private static final class IsPrevNFDSafe implements IsPrevBoundary{
/*
* for NF*D:
* read backwards and check if the lead combining class is 0
* if c2!=0 then (c2, c) is a surrogate pair (reversed - c2 is first
* surrogate but read second!)
*/
public boolean isPrevBoundary(UCharacterIterator src,
int/*unsigned*/ minC,
int/*unsigned*/ ccOrQCMask,
char[] chars) {
return NormalizerImpl.isNFDSafe(getPrevNorm32(src, minC,
ccOrQCMask, chars),
ccOrQCMask,
ccOrQCMask& NormalizerImpl.QC_MASK);
}
}
private static final class IsPrevTrueStarter implements IsPrevBoundary{
/*
* read backwards and check if the character is (or its decomposition
* begins with) a "true starter" (cc==0 and NF*C_YES)
* if c2!=0 then (c2, c) is a surrogate pair (reversed - c2 is first
* surrogate but read second!)
*/
public boolean isPrevBoundary(UCharacterIterator src,
int/*unsigned*/ minC,
int/*unsigned*/ ccOrQCMask,
char[] chars) {
long norm32;
int/*unsigned*/ decompQCMask;
decompQCMask=(ccOrQCMask<<2)&0xf; /*decomposition quick check mask*/
norm32=getPrevNorm32(src, minC, ccOrQCMask|decompQCMask, chars);
return NormalizerImpl.isTrueStarter(norm32,ccOrQCMask,decompQCMask);
}
}
private static int findPreviousIterationBoundary(UCharacterIterator src,
IsPrevBoundary obj,
int/*unsigned*/ minC,
int/*mask*/ mask,
char[] buffer,
int[] startIndex) {
char[] chars=new char[2];
boolean isBoundary;
/* fill the buffer from the end backwards */
startIndex[0] = buffer.length;
chars[0]=0;
while(src.getIndex()>0 && chars[0]!=UCharacterIterator.DONE) {
isBoundary=obj.isPrevBoundary(src, minC, mask, chars);
/* always write this character to the front of the buffer */
/* make sure there is enough space in the buffer */
if(startIndex[0] < (chars[1]==0 ? 1 : 2)) {
// grow the buffer
char[] newBuf = new char[buffer.length*2];
/* move the current buffer contents up */
System.arraycopy(buffer,startIndex[0],newBuf,
newBuf.length-(buffer.length-startIndex[0]),
buffer.length-startIndex[0]);
//adjust the startIndex
startIndex[0]+=newBuf.length-buffer.length;
buffer=newBuf;
newBuf=null;
}
buffer[--startIndex[0]]=chars[0];
if(chars[1]!=0) {
buffer[--startIndex[0]]=chars[1];
}
/* stop if this just-copied character is a boundary */
if(isBoundary) {
break;
}
}
/* return the length of the buffer contents */
return buffer.length-startIndex[0];
}
private static int previous(UCharacterIterator src,
char[] dest, int destStart, int destLimit,
Mode mode,
boolean doNormalize,
boolean[] pNeededToNormalize,
int options) {
IsPrevBoundary isPreviousBoundary;
int destLength, bufferLength;
int/*unsigned*/ mask;
int c,c2;
char minC;
int destCapacity = destLimit-destStart;
destLength=0;
if(pNeededToNormalize!=null) {
pNeededToNormalize[0]=false;
}
minC = (char)mode.getMinC();
mask = mode.getMask();
isPreviousBoundary = mode.getPrevBoundary();
if(isPreviousBoundary==null) {
destLength=0;
if((c=src.previous())>=0) {
destLength=1;
if(UTF16.isTrailSurrogate((char)c)) {
c2= src.previous();
if(c2!= UCharacterIterator.DONE) {
if(UTF16.isLeadSurrogate((char)c2)) {
if(destCapacity>=2) {
dest[1]=(char)c; // trail surrogate
destLength=2;
}
// lead surrogate to be written below
c=c2;
} else {
src.moveIndex(1);
}
}
}
if(destCapacity>0) {
dest[0]=(char)c;
}
}
return destLength;
}
char[] buffer = new char[100];
int[] startIndex= new int[1];
bufferLength=findPreviousIterationBoundary(src,
isPreviousBoundary,
minC, mask,buffer,
startIndex);
if(bufferLength>0) {
if(doNormalize) {
destLength=NormalizerBase.normalize(buffer,startIndex[0],
startIndex[0]+bufferLength,
dest, destStart,destLimit,
mode, options);
if(pNeededToNormalize!=null) {
pNeededToNormalize[0]=destLength!=bufferLength ||
Utility.arrayRegionMatches(
buffer,0,dest,
destStart,destLimit
);
}
} else {
/* just copy the source characters */
if(destCapacity>0) {
System.arraycopy(buffer,startIndex[0],dest,0,
(bufferLength<destCapacity) ?
bufferLength : destCapacity
);
}
}
}
return destLength;
}
/* forward iteration ---------------------------------------------------- */
/*
* read forward and check if the character is a next-iteration boundary
* if c2!=0 then (c, c2) is a surrogate pair
*/
private interface IsNextBoundary{
boolean isNextBoundary(UCharacterIterator src,
int/*unsigned*/ minC,
int/*unsigned*/ mask,
int[] chars);
}
/*
* read forward and get norm32
* return 0 if the character is <minC
* if c2!=0 then (c2, c) is a surrogate pair
* always reads complete characters
*/
private static long /*unsigned*/ getNextNorm32(UCharacterIterator src,
int/*unsigned*/ minC,
int/*unsigned*/ mask,
int[] chars) {
long norm32;
/* need src.hasNext() to be true */
chars[0]=src.next();
chars[1]=0;
if(chars[0]<minC) {
return 0;
}
norm32=NormalizerImpl.getNorm32((char)chars[0]);
if(UTF16.isLeadSurrogate((char)chars[0])) {
if(src.current()!=UCharacterIterator.DONE &&
UTF16.isTrailSurrogate((char)(chars[1]=src.current()))) {
src.moveIndex(1); /* skip the c2 surrogate */
if((norm32&mask)==0) {
/* irrelevant data */
return 0;
} else {
/* norm32 must be a surrogate special */
return NormalizerImpl.getNorm32FromSurrogatePair(norm32,(char)chars[1]);
}
} else {
/* unmatched surrogate */
return 0;
}
}
return norm32;
}
/*
* for NF*D:
* read forward and check if the lead combining class is 0
* if c2!=0 then (c, c2) is a surrogate pair
*/
private static final class IsNextNFDSafe implements IsNextBoundary{
public boolean isNextBoundary(UCharacterIterator src,
int/*unsigned*/ minC,
int/*unsigned*/ ccOrQCMask,
int[] chars) {
return NormalizerImpl.isNFDSafe(getNextNorm32(src,minC,ccOrQCMask,chars),
ccOrQCMask, ccOrQCMask&NormalizerImpl.QC_MASK);
}
}
/*
* for NF*C:
* read forward and check if the character is (or its decomposition begins
* with) a "true starter" (cc==0 and NF*C_YES)
* if c2!=0 then (c, c2) is a surrogate pair
*/
private static final class IsNextTrueStarter implements IsNextBoundary{
public boolean isNextBoundary(UCharacterIterator src,
int/*unsigned*/ minC,
int/*unsigned*/ ccOrQCMask,
int[] chars) {
long norm32;
int/*unsigned*/ decompQCMask;
decompQCMask=(ccOrQCMask<<2)&0xf; /*decomposition quick check mask*/
norm32=getNextNorm32(src, minC, ccOrQCMask|decompQCMask, chars);
return NormalizerImpl.isTrueStarter(norm32, ccOrQCMask, decompQCMask);
}
}
private static int findNextIterationBoundary(UCharacterIterator src,
IsNextBoundary obj,
int/*unsigned*/ minC,
int/*unsigned*/ mask,
char[] buffer) {
if(src.current()==UCharacterIterator.DONE) {
return 0;
}
/* get one character and ignore its properties */
int[] chars = new int[2];
chars[0]=src.next();
buffer[0]=(char)chars[0];
int bufferIndex = 1;
if(UTF16.isLeadSurrogate((char)chars[0])&&
src.current()!=UCharacterIterator.DONE) {
if(UTF16.isTrailSurrogate((char)(chars[1]=src.next()))) {
buffer[bufferIndex++]=(char)chars[1];
} else {
src.moveIndex(-1); /* back out the non-trail-surrogate */
}
}
/* get all following characters until we see a boundary */
/* checking hasNext() instead of c!=DONE on the off-chance that U+ffff
* is part of the string */
while( src.current()!=UCharacterIterator.DONE) {
if(obj.isNextBoundary(src, minC, mask, chars)) {
/* back out the latest movement to stop at the boundary */
src.moveIndex(chars[1]==0 ? -1 : -2);
break;
} else {
if(bufferIndex+(chars[1]==0 ? 1 : 2)<=buffer.length) {
buffer[bufferIndex++]=(char)chars[0];
if(chars[1]!=0) {
buffer[bufferIndex++]=(char)chars[1];
}
} else {
char[] newBuf = new char[buffer.length*2];
System.arraycopy(buffer,0,newBuf,0,bufferIndex);
buffer = newBuf;
buffer[bufferIndex++]=(char)chars[0];
if(chars[1]!=0) {
buffer[bufferIndex++]=(char)chars[1];
}
}
}
}
/* return the length of the buffer contents */
return bufferIndex;
}
private static int next(UCharacterIterator src,
char[] dest, int destStart, int destLimit,
NormalizerBase.Mode mode,
boolean doNormalize,
boolean[] pNeededToNormalize,
int options) {
IsNextBoundary isNextBoundary;
int /*unsigned*/ mask;
int /*unsigned*/ bufferLength;
int c,c2;
char minC;
int destCapacity = destLimit - destStart;
int destLength = 0;
if(pNeededToNormalize!=null) {
pNeededToNormalize[0]=false;
}
minC = (char)mode.getMinC();
mask = mode.getMask();
isNextBoundary = mode.getNextBoundary();
if(isNextBoundary==null) {
destLength=0;
c=src.next();
if(c!=UCharacterIterator.DONE) {
destLength=1;
if(UTF16.isLeadSurrogate((char)c)) {
c2= src.next();
if(c2!= UCharacterIterator.DONE) {
if(UTF16.isTrailSurrogate((char)c2)) {
if(destCapacity>=2) {
dest[1]=(char)c2; // trail surrogate
destLength=2;
}
// lead surrogate to be written below
} else {
src.moveIndex(-1);
}
}
}
if(destCapacity>0) {
dest[0]=(char)c;
}
}
return destLength;
}
char[] buffer=new char[100];
int[] startIndex = new int[1];
bufferLength=findNextIterationBoundary(src,isNextBoundary, minC, mask,
buffer);
if(bufferLength>0) {
if(doNormalize) {
destLength=mode.normalize(buffer,startIndex[0],bufferLength,
dest,destStart,destLimit, options);
if(pNeededToNormalize!=null) {
pNeededToNormalize[0]=destLength!=bufferLength ||
Utility.arrayRegionMatches(buffer,startIndex[0],
dest,destStart,
destLength);
}
} else {
/* just copy the source characters */
if(destCapacity>0) {
System.arraycopy(buffer,0,dest,destStart,
Math.min(bufferLength,destCapacity)
);
}
}
}
return destLength;
}
private void clearBuffer() {
bufferLimit=bufferStart=bufferPos=0;
}
private boolean nextNormalize() {
clearBuffer();
currentIndex=nextIndex;
text.setIndex(nextIndex);
bufferLimit=next(text,buffer,bufferStart,buffer.length,mode,true,null,options);
nextIndex=text.getIndex();
return (bufferLimit>0);
}
private boolean previousNormalize() {
clearBuffer();
nextIndex=currentIndex;
text.setIndex(currentIndex);
bufferLimit=previous(text,buffer,bufferStart,buffer.length,mode,true,null,options);
currentIndex=text.getIndex();
bufferPos = bufferLimit;
return bufferLimit>0;
}
private int getCodePointAt(int index) {
if( UTF16.isSurrogate(buffer[index])) {
if(UTF16.isLeadSurrogate(buffer[index])) {
if((index+1)<bufferLimit &&
UTF16.isTrailSurrogate(buffer[index+1])) {
return UCharacterProperty.getRawSupplementary(
buffer[index],
buffer[index+1]
);
}
}else if(UTF16.isTrailSurrogate(buffer[index])) {
if(index>0 && UTF16.isLeadSurrogate(buffer[index-1])) {
return UCharacterProperty.getRawSupplementary(
buffer[index-1],
buffer[index]
);
}
}
}
return buffer[index];
}
/**
* Internal API
* @internal
*/
public static boolean isNFSkippable(int c, Mode mode) {
return mode.isNFSkippable(c);
}
//
// Options
//
/*
* Default option for Unicode 3.2.0 normalization.
* Corrigendum 4 was fixed in Unicode 3.2.0 but isn't supported in
* IDNA/StringPrep.
* The public review issue #29 was fixed in Unicode 4.1.0. Corrigendum 5
* allowed Unicode 3.2 to 4.0.1 to apply the fix for PRI #29, but it isn't
* supported by IDNA/StringPrep as well as Corrigendum 4.
*/
public static final int UNICODE_3_2_0_ORIGINAL =
UNICODE_3_2 |
NormalizerImpl.WITHOUT_CORRIGENDUM4_CORRECTIONS |
NormalizerImpl.BEFORE_PRI_29;
/*
* Default option for the latest Unicode normalization. This option is
* provided mainly for testing.
* The value zero means that normalization is done with the fixes for
* - Corrigendum 4 (Five CJK Canonical Mapping Errors)
* - Corrigendum 5 (Normalization Idempotency)
*/
public static final int UNICODE_LATEST = 0x00;
//
// public constructor and methods for java.text.Normalizer and
// sun.text.Normalizer
//
/**
* Creates a new <tt>Normalizer object for iterating over the
* normalized form of a given string.
*
* @param str The string to be normalized. The normalization
* will start at the beginning of the string.
*
* @param mode The normalization mode.
*/
public NormalizerBase(String str, Mode mode) {
this(str, mode, UNICODE_LATEST);
}
/**
* Normalizes a <code>String using the given normalization form.
*
* @param str the input string to be normalized.
* @param form the normalization form
*/
public static String normalize(String str, Normalizer.Form form) {
return normalize(str, form, UNICODE_LATEST);
}
/**
* Normalizes a <code>String using the given normalization form.
*
* @param str the input string to be normalized.
* @param form the normalization form
* @param options the optional features to be enabled.
*/
public static String normalize(String str, Normalizer.Form form, int options) {
int len = str.length();
boolean asciiOnly = true;
if (len < 80) {
for (int i = 0; i < len; i++) {
if (str.charAt(i) > 127) {
asciiOnly = false;
break;
}
}
} else {
char[] a = str.toCharArray();
for (int i = 0; i < len; i++) {
if (a[i] > 127) {
asciiOnly = false;
break;
}
}
}
switch (form) {
case NFC :
return asciiOnly ? str : NFC.normalize(str, options);
case NFD :
return asciiOnly ? str : NFD.normalize(str, options);
case NFKC :
return asciiOnly ? str : NFKC.normalize(str, options);
case NFKD :
return asciiOnly ? str : NFKD.normalize(str, options);
}
throw new IllegalArgumentException("Unexpected normalization form: " +
form);
}
/**
* Test if a string is in a given normalization form.
* This is semantically equivalent to source.equals(normalize(source, mode)).
*
* Unlike quickCheck(), this function returns a definitive result,
* never a "maybe".
* For NFD, NFKD, and FCD, both functions work exactly the same.
* For NFC and NFKC where quickCheck may return "maybe", this function will
* perform further tests to arrive at a true/false result.
* @param str the input string to be checked to see if it is normalized
* @param form the normalization form
* @param options the optional features to be enabled.
*/
public static boolean isNormalized(String str, Normalizer.Form form) {
return isNormalized(str, form, UNICODE_LATEST);
}
/**
* Test if a string is in a given normalization form.
* This is semantically equivalent to source.equals(normalize(source, mode)).
*
* Unlike quickCheck(), this function returns a definitive result,
* never a "maybe".
* For NFD, NFKD, and FCD, both functions work exactly the same.
* For NFC and NFKC where quickCheck may return "maybe", this function will
* perform further tests to arrive at a true/false result.
* @param str the input string to be checked to see if it is normalized
* @param form the normalization form
* @param options the optional features to be enabled.
*/
public static boolean isNormalized(String str, Normalizer.Form form, int options) {
switch (form) {
case NFC:
return (NFC.quickCheck(str.toCharArray(),0,str.length(),false,NormalizerImpl.getNX(options))==YES);
case NFD:
return (NFD.quickCheck(str.toCharArray(),0,str.length(),false,NormalizerImpl.getNX(options))==YES);
case NFKC:
return (NFKC.quickCheck(str.toCharArray(),0,str.length(),false,NormalizerImpl.getNX(options))==YES);
case NFKD:
return (NFKD.quickCheck(str.toCharArray(),0,str.length(),false,NormalizerImpl.getNX(options))==YES);
}
throw new IllegalArgumentException("Unexpected normalization form: " +
form);
}
}
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