Transliterator is an abstract class that transliterates text from one format to another. More...

#include <translit.h>

Inheritance diagram for icu::Transliterator:

Data Structures
union	Token
	A context integer or pointer for a factory function, passed by value. More...

Public Types
typedef Transliterator (	Factory) (const UnicodeString &ID, Token context)
	A function that creates and returns a Transliterator.

Public Member Functions
virtual	~Transliterator ()
	Destructor.

virtual Transliterator *	clone () const
	Implements Cloneable.

virtual int32_t	transliterate (Replaceable &text, int32_t start, int32_t limit) const
	Transliterates a segment of a string, with optional filtering.

virtual void	transliterate (Replaceable &text) const
	Transliterates an entire string in place.

virtual void	transliterate (Replaceable &text, UTransPosition &index, const UnicodeString &insertion, UErrorCode &status) const
	Transliterates the portion of the text buffer that can be transliterated unambiguosly after new text has been inserted, typically as a result of a keyboard event.

virtual void	transliterate (Replaceable &text, UTransPosition &index, UChar32 insertion, UErrorCode &status) const
	Transliterates the portion of the text buffer that can be transliterated unambiguosly after a new character has been inserted, typically as a result of a keyboard event.

virtual void	transliterate (Replaceable &text, UTransPosition &index, UErrorCode &status) const
	Transliterates the portion of the text buffer that can be transliterated unambiguosly.

virtual void	finishTransliteration (Replaceable &text, UTransPosition &index) const
	Finishes any pending transliterations that were waiting for more characters.

virtual void	filteredTransliterate (Replaceable &text, UTransPosition &index, UBool incremental) const
	Transliterate a substring of text, as specified by index, taking filters into account.

int32_t	getMaximumContextLength () const
	Returns the length of the longest context required by this transliterator.

virtual const UnicodeString &	getID () const
	Returns a programmatic identifier for this transliterator.

const UnicodeFilter *	getFilter () const
	Returns the filter used by this transliterator, or `nullptr` if this transliterator uses no filter.

UnicodeFilter *	orphanFilter ()
	Returns the filter used by this transliterator, or `nullptr` if this transliterator uses no filter.

void	adoptFilter (UnicodeFilter *adoptedFilter)
	Changes the filter used by this transliterator.

Transliterator *	createInverse (UErrorCode &status) const
	Returns this transliterator's inverse.

virtual UnicodeString &	toRules (UnicodeString &result, UBool escapeUnprintable) const
	Create a rule string that can be passed to createFromRules() to recreate this transliterator.

int32_t	countElements () const
	Return the number of elements that make up this transliterator.

const Transliterator &	getElement (int32_t index, UErrorCode &ec) const
	Return an element that makes up this transliterator.

UnicodeSet &	getSourceSet (UnicodeSet &result) const
	Returns the set of all characters that may be modified in the input text by this Transliterator.

virtual void	handleGetSourceSet (UnicodeSet &result) const
	Framework method that returns the set of all characters that may be modified in the input text by this Transliterator, ignoring the effect of this object's filter.

virtual UnicodeSet &	getTargetSet (UnicodeSet &result) const
	Returns the set of all characters that may be generated as replacement text by this transliterator.

virtual UClassID	getDynamicClassID () const override=0
	Returns a unique class ID polymorphically.

Public Member Functions inherited from icu::UObject
virtual	~UObject ()
	Destructor.

Static Public Member Functions
static Token	integerToken (int32_t)
	Return a token containing an integer.

static Token	pointerToken (void *)
	Return a token containing a pointer.

static UnicodeString &	getDisplayName (const UnicodeString &ID, UnicodeString &result)
	Returns a name for this transliterator that is appropriate for display to the user in the default locale.

static UnicodeString &	getDisplayName (const UnicodeString &ID, const Locale &inLocale, UnicodeString &result)
	Returns a name for this transliterator that is appropriate for display to the user in the given locale.

static Transliterator *	createInstance (const UnicodeString &ID, UTransDirection dir, UParseError &parseError, UErrorCode &status)
	Returns a `Transliterator` object given its ID.

static Transliterator *	createInstance (const UnicodeString &ID, UTransDirection dir, UErrorCode &status)
	Returns a `Transliterator` object given its ID.

static Transliterator *	createFromRules (const UnicodeString &ID, const UnicodeString &rules, UTransDirection dir, UParseError &parseError, UErrorCode &status)
	Returns a `Transliterator` object constructed from the given rule string.

static void	registerFactory (const UnicodeString &id, Factory factory, Token context)
	Registers a factory function that creates transliterators of a given ID.

static void	registerInstance (Transliterator *adoptedObj)
	Registers an instance `obj` of a subclass of `Transliterator` with the system.

static void	registerAlias (const UnicodeString &aliasID, const UnicodeString &realID)
	Registers an ID string as an alias of another ID string.

static void	unregister (const UnicodeString &ID)
	Unregisters a transliterator or class.

static StringEnumeration *	getAvailableIDs (UErrorCode &ec)
	Return a StringEnumeration over the IDs available at the time of the call, including user-registered IDs.

static int32_t	countAvailableSources ()
	Return the number of registered source specifiers.

static UnicodeString &	getAvailableSource (int32_t index, UnicodeString &result)
	Return a registered source specifier.

static int32_t	countAvailableTargets (const UnicodeString &source)
	Return the number of registered target specifiers for a given source specifier.

static UnicodeString &	getAvailableTarget (int32_t index, const UnicodeString &source, UnicodeString &result)
	Return a registered target specifier for a given source.

static int32_t	countAvailableVariants (const UnicodeString &source, const UnicodeString &target)
	Return the number of registered variant specifiers for a given source-target pair.

static UnicodeString &	getAvailableVariant (int32_t index, const UnicodeString &source, const UnicodeString &target, UnicodeString &result)
	Return a registered variant specifier for a given source-target pair.

static UClassID	getStaticClassID ()
	Return the class ID for this class.

static int32_t	countAvailableIDs ()
	Return the number of IDs currently registered with the system.

static const UnicodeString &	getAvailableID (int32_t index)
	Return the index-th available ID.

Protected Member Functions
	Transliterator (const UnicodeString &ID, UnicodeFilter *adoptedFilter)
	Default constructor.

	Transliterator (const Transliterator &)
	Copy constructor.

Transliterator &	operator= (const Transliterator &)
	Assignment operator.

virtual void	handleTransliterate (Replaceable &text, UTransPosition &pos, UBool incremental) const =0
	Abstract method that concrete subclasses define to implement their transliteration algorithm.

void	setMaximumContextLength (int32_t maxContextLength)
	Method for subclasses to use to set the maximum context length.

void	setID (const UnicodeString &id)
	Set the ID of this transliterators.

Static Protected Member Functions
static Transliterator *	createBasicInstance (const UnicodeString &id, const UnicodeString *canon)
	Create a transliterator from a basic ID.

static void	_registerFactory (const UnicodeString &id, Factory factory, Token context)

static void	_registerInstance (Transliterator *adoptedObj)

static void	_registerAlias (const UnicodeString &aliasID, const UnicodeString &realID)

static void	_registerSpecialInverse (const UnicodeString &target, const UnicodeString &inverseTarget, UBool bidirectional)
	Register two targets as being inverses of one another.

static int32_t	_countAvailableSources ()
	Non-mutexed internal method.

static UnicodeString &	_getAvailableSource (int32_t index, UnicodeString &result)
	Non-mutexed internal method.

static int32_t	_countAvailableTargets (const UnicodeString &source)
	Non-mutexed internal method.

static UnicodeString &	_getAvailableTarget (int32_t index, const UnicodeString &source, UnicodeString &result)
	Non-mutexed internal method.

static int32_t	_countAvailableVariants (const UnicodeString &source, const UnicodeString &target)
	Non-mutexed internal method.

static UnicodeString &	_getAvailableVariant (int32_t index, const UnicodeString &source, const UnicodeString &target, UnicodeString &result)
	Non-mutexed internal method.

Friends
class	TransliteratorParser

class	TransliteratorIDParser

class	TransliteratorAlias

Detailed Description

Transliterator is an abstract class that transliterates text from one format to another.

The most common kind of transliterator is a script, or alphabet, transliterator. For example, a Russian to Latin transliterator changes Russian text written in Cyrillic characters to phonetically equivalent Latin characters. It does not translate Russian to English! Transliteration, unlike translation, operates on characters, without reference to the meanings of words and sentences.

Although script conversion is its most common use, a transliterator can actually perform a more general class of tasks. In fact, Transliterator defines a very general API which specifies only that a segment of the input text is replaced by new text. The particulars of this conversion are determined entirely by subclasses of Transliterator.

Transliterators are stateless

Transliterator objects are stateless; they retain no information between calls to transliterate(). (However, this does not mean that threads may share transliterators without synchronizing them. Transliterators are not immutable, so they must be synchronized when shared between threads.) This might seem to limit the complexity of the transliteration operation. In practice, subclasses perform complex transliterations by delaying the replacement of text until it is known that no other replacements are possible. In other words, although the Transliterator objects are stateless, the source text itself embodies all the needed information, and delayed operation allows arbitrary complexity.

Batch transliteration

The simplest way to perform transliteration is all at once, on a string of existing text. This is referred to as batch transliteration. For example, given a string input and a transliterator t, the call

String result = t.transliterate(input);

will transliterate it and return the result. Other methods allow the client to specify a substring to be transliterated and to use Replaceable objects instead of strings, in order to preserve out-of-band information (such as text styles).

Keyboard transliteration

Somewhat more involved is keyboard, or incremental transliteration. This is the transliteration of text that is arriving from some source (typically the user's keyboard) one character at a time, or in some other piecemeal fashion.

In keyboard transliteration, a Replaceable buffer stores the text. As text is inserted, as much as possible is transliterated on the fly. This means a GUI that displays the contents of the buffer may show text being modified as each new character arrives.

Consider the simple rule-based Transliterator:

    th>{theta}
    t>{tau}

When the user types 't', nothing will happen, since the transliterator is waiting to see if the next character is 'h'. To remedy this, we introduce the notion of a cursor, marked by a '|' in the output string:

    t>|{tau}
    {tau}h>{theta}

Now when the user types 't', tau appears, and if the next character is 'h', the tau changes to a theta. This is accomplished by maintaining a cursor position (independent of the insertion point, and invisible in the GUI) across calls to transliterate(). Typically, the cursor will be coincident with the insertion point, but in a case like the one above, it will precede the insertion point.

Keyboard transliteration methods maintain a set of three indices that are updated with each call to transliterate(), including the cursor, start, and limit. Since these indices are changed by the method, they are passed in an int[] array. The START index marks the beginning of the substring that the transliterator will look at. It is advanced as text becomes committed (but it is not the committed index; that's the CURSOR). The CURSOR index, described above, marks the point at which the transliterator last stopped, either because it reached the end, or because it required more characters to disambiguate between possible inputs. The CURSOR can also be explicitly set by rules in a rule-based Transliterator. Any characters before the CURSOR index are frozen; future keyboard transliteration calls within this input sequence will not change them. New text is inserted at the LIMIT index, which marks the end of the substring that the transliterator looks at.

Because keyboard transliteration assumes that more characters are to arrive, it is conservative in its operation. It only transliterates when it can do so unambiguously. Otherwise it waits for more characters to arrive. When the client code knows that no more characters are forthcoming, perhaps because the user has performed some input termination operation, then it should call finishTransliteration() to complete any pending transliterations.

Inverses

Pairs of transliterators may be inverses of one another. For example, if transliterator A transliterates characters by incrementing their Unicode value (so "abc" -> "def"), and transliterator B decrements character values, then A is an inverse of B and vice versa. If we compose A with B in a compound transliterator, the result is the identity transliterator, that is, a transliterator that does not change its input text.

The Transliterator method getInverse() returns a transliterator's inverse, if one exists, or null otherwise. However, the result of getInverse() usually will not be a true mathematical inverse. This is because true inverse transliterators are difficult to formulate. For example, consider two transliterators: AB, which transliterates the character 'A' to 'B', and BA, which transliterates 'B' to 'A'. It might seem that these are exact inverses, since

"A" x AB -> "B"
"B" x BA -> "A"

where 'x' represents transliteration. However,

"ABCD" x AB -> "BBCD"
"BBCD" x BA -> "AACD"

so AB composed with BA is not the identity. Nonetheless, BA may be usefully considered to be AB's inverse, and it is on this basis that AB.getInverse() could legitimately return BA.

IDs and display names

A transliterator is designated by a short identifier string or ID. IDs follow the format source-destination, where source describes the entity being replaced, and destination describes the entity replacing source. The entities may be the names of scripts, particular sequences of characters, or whatever else it is that the transliterator converts to or from. For example, a transliterator from Russian to Latin might be named "Russian-Latin". A transliterator from keyboard escape sequences to Latin-1 characters might be named "KeyboardEscape-Latin1". By convention, system entity names are in English, with the initial letters of words capitalized; user entity names may follow any format so long as they do not contain dashes.

In addition to programmatic IDs, transliterator objects have display names for presentation in user interfaces, returned by getDisplayName.

Factory methods and registration

In general, client code should use the factory method createInstance to obtain an instance of a transliterator given its ID. Valid IDs may be enumerated using getAvailableIDs(). Since transliterators are mutable, multiple calls to createInstance with the same ID will return distinct objects.

In addition to the system transliterators registered at startup, user transliterators may be registered by calling registerInstance() at run time. A registered instance acts a template; future calls to createInstance with the ID of the registered object return clones of that object. Thus any object passed to registerInstance() must implement clone() properly. To register a transliterator subclass without instantiating it (until it is needed), users may call registerFactory. In this case, the objects are instantiated by invoking the zero-argument public constructor of the class.

Subclassing

Subclasses must implement the abstract method handleTransliterate().

Subclasses should override the transliterate() method taking a Replaceable and the transliterate() method taking a String and StringBuffer if the performance of these methods can be improved over the performance obtained by the default implementations in this class.

Rule syntax

A set of rules determines how to perform translations. Rules within a rule set are separated by semicolons (';'). To include a literal semicolon, prefix it with a backslash ('\'). Unicode Pattern_White_Space is ignored. If the first non-blank character on a line is '#', the entire line is ignored as a comment.

Each set of rules consists of two groups, one forward, and one reverse. This is a convention that is not enforced; rules for one direction may be omitted, with the result that translations in that direction will not modify the source text. In addition, bidirectional forward-reverse rules may be specified for symmetrical transformations.

Note: Another description of the Transliterator rule syntax is available in section Transform Rules Syntax of UTS #35: Unicode LDML. The rules are shown there using arrow symbols ← and → and ↔. ICU supports both those and the equivalent ASCII symbols < and > and <>.

Rule statements take one of the following forms:

$alefmadda=\u0622;: Variable definition. The name on the left is assigned the text on the right. In this example, after this statement, instances of the left hand name, "$alefmadda", will be replaced by the Unicode character U+0622. Variable names must begin with a letter and consist only of letters, digits, and underscores. Case is significant. Duplicate names cause an exception to be thrown, that is, variables cannot be redefined. The right hand side may contain well-formed text of any length, including no text at all ("$empty=;"). The right hand side may contain embedded UnicodeSet patterns, for example, "$softvowel=[eiyEIY]".
ai>$alefmadda;: Forward translation rule. This rule states that the string on the left will be changed to the string on the right when performing forward transliteration.
ai<$alefmadda;: Reverse translation rule. This rule states that the string on the right will be changed to the string on the left when performing reverse transliteration.

ai<>$alefmadda;: Bidirectional translation rule. This rule states that the string on the right will be changed to the string on the left when performing forward transliteration, and vice versa when performing reverse transliteration.

Translation rules consist of a match pattern and an output string. The match pattern consists of literal characters, optionally preceded by context, and optionally followed by context. Context characters, like literal pattern characters, must be matched in the text being transliterated. However, unlike literal pattern characters, they are not replaced by the output text. For example, the pattern "abc{def}" indicates the characters "def" must be preceded by "abc" for a successful match. If there is a successful match, "def" will be replaced, but not "abc". The final '}' is optional, so "abc{def" is equivalent to "abc{def}". Another example is "{123}456" (or "123}456") in which the literal pattern "123" must be followed by "456".

The output string of a forward or reverse rule consists of characters to replace the literal pattern characters. If the output string contains the character '|', this is taken to indicate the location of the cursor after replacement. The cursor is the point in the text at which the next replacement, if any, will be applied. The cursor is usually placed within the replacement text; however, it can actually be placed into the preceding or following context by using the special character '@'. Examples:

    a {foo} z > | @ bar; # foo -> bar, move cursor before a
    {foo} xyz > bar @|; # foo -> bar, cursor between y and z

UnicodeSet

UnicodeSet patterns may appear anywhere that makes sense. They may appear in variable definitions. Contrariwise, UnicodeSet patterns may themselves contain variable references, such as "$a=[a-z];$not_a=[^$a]", or "$range=a-z;$ll=[$range]".

UnicodeSet patterns may also be embedded directly into rule strings. Thus, the following two rules are equivalent:

    $vowel=[aeiou]; $vowel>'*'; # One way to do this
    [aeiou]>'*'; # Another way

See UnicodeSet for more documentation and examples.

Segments

Segments of the input string can be matched and copied to the output string. This makes certain sets of rules simpler and more general, and makes reordering possible. For example:

    ([a-z]) > $1 $1; # double lowercase letters
    ([:Lu:]) ([:Ll:]) > $2 $1; # reverse order of Lu-Ll pairs

The segment of the input string to be copied is delimited by "(" and ")". Up to nine segments may be defined. Segments may not overlap. In the output string, "$1" through "$9" represent the input string segments, in left-to-right order of definition.

Anchors

Patterns can be anchored to the beginning or the end of the text. This is done with the special characters '^' and '$'. For example:

  ^ a   > 'BEG_A';   # match 'a' at start of text
    a   > 'A'; # match other instances of 'a'
    z $ > 'END_Z';   # match 'z' at end of text
    z   > 'Z';       # match other instances of 'z'

It is also possible to match the beginning or the end of the text using a UnicodeSet. This is done by including a virtual anchor character '$' at the end of the set pattern. Although this is usually the match character for the end anchor, the set will match either the beginning or the end of the text, depending on its placement. For example:

  $x = [a-z$];   # match 'a' through 'z' OR anchor
  $x 1    > 2;   # match '1' after a-z or at the start
     3 $x > 4;   # match '3' before a-z or at the end

Example

The following example rules illustrate many of the features of the rule language.

Rule 1.	`abc{def}>x\|y`
Rule 2.	`xyz>r`
Rule 3.	`yz>q`

Applying these rules to the string "adefabcdefz" yields the following results:

`\|adefabcdefz`	Initial state, no rules match. Advance cursor.
`a\|defabcdefz`	Still no match. Rule 1 does not match because the preceding context is not present.
`ad\|efabcdefz`	Still no match. Keep advancing until there is a match...
`ade\|fabcdefz`	...
`adef\|abcdefz`	...
`adefa\|bcdefz`	...
`adefab\|cdefz`	...
`adefabc\|defz`	Rule 1 matches; replace "`def`" with "`xy`" and back up the cursor to before the '`y`'.
`adefabcx\|yz`	Although "`xyz`" is present, rule 2 does not match because the cursor is before the '`y`', not before the '`x`'. Rule 3 does match. Replace "`yz`" with "`q`".
`adefabcxq\|`	The cursor is at the end; transliteration is complete.

The order of rules is significant. If multiple rules may match at some point, the first matching rule is applied.

Forward and reverse rules may have an empty output string. Otherwise, an empty left or right hand side of any statement is a syntax error.

Single quotes are used to quote any character other than a digit or letter. To specify a single quote itself, inside or outside of quotes, use two single quotes in a row. For example, the rule "'>'>o''clock" changes the string ">" to the string "o'clock".

Notes

While a Transliterator is being built from rules, it checks that the rules are added in proper order. For example, if the rule "a>x" is followed by the rule "ab>y", then the second rule will throw an exception. The reason is that the second rule can never be triggered, since the first rule always matches anything it matches. In other words, the first rule masks the second rule.

Author: Alan Liu

Stable:: ICU 2.0

Definition at line 490 of file translit.h.

Member Typedef Documentation

◆ Factory

typedef Transliterator *(* icu::Transliterator::Factory) (const UnicodeString &ID, Token context)

A function that creates and returns a Transliterator.

When invoked, it will be passed the ID string that is being instantiated, together with the context pointer that was passed in when the factory function was first registered. Many factory functions will ignore both parameters, however, functions that are registered to more than one ID may use the ID or the context parameter to parameterize the transliterator they create.

Parameters

ID	the string identifier for this transliterator
context	a context pointer that will be stored and later passed to the factory function when an ID matching the registration ID is being instantiated with this factory.

Stable:: ICU 2.4

Definition at line 560 of file translit.h.

Constructor & Destructor Documentation

◆ Transliterator() [1/2]

icu::Transliterator::Transliterator	(	const UnicodeString &	ID,
		UnicodeFilter *	adoptedFilter
	)

protected

Default constructor.

Parameters

ID	the string identifier for this transliterator
adoptedFilter	the filter. Any character for which `filter.contains()` returns `false` will not be altered by this transliterator. If `filter` is `null` then no filtering is applied.

Stable:: ICU 2.4

◆ Transliterator() [2/2]

icu::Transliterator::Transliterator ( const Transliterator & )

protected

Copy constructor.

Stable:: ICU 2.4

◆ ~Transliterator()

virtual icu::Transliterator::~Transliterator ( )

virtual

Destructor.

Stable:: ICU 2.0

Member Function Documentation

◆ _countAvailableSources()

static int32_t icu::Transliterator::_countAvailableSources ( )

staticprotected

Non-mutexed internal method.

Internal:: Do not use. This API is for internal use only.

◆ _countAvailableTargets()

static int32_t icu::Transliterator::_countAvailableTargets ( const UnicodeString & source )

staticprotected

Non-mutexed internal method.

Internal:: Do not use. This API is for internal use only.

◆ _countAvailableVariants()

static int32_t icu::Transliterator::_countAvailableVariants	(	const UnicodeString &	source,
		const UnicodeString &	target
	)

staticprotected

Non-mutexed internal method.

Internal:: Do not use. This API is for internal use only.

◆ _getAvailableSource()

static UnicodeString & icu::Transliterator::_getAvailableSource	(	int32_t	index,
		UnicodeString &	result
	)

staticprotected

Non-mutexed internal method.

Internal:: Do not use. This API is for internal use only.

◆ _getAvailableTarget()

static UnicodeString & icu::Transliterator::_getAvailableTarget	(	int32_t	index,
		const UnicodeString &	source,
		UnicodeString &	result
	)

staticprotected

Non-mutexed internal method.

Internal:: Do not use. This API is for internal use only.

◆ _getAvailableVariant()

static UnicodeString & icu::Transliterator::_getAvailableVariant	(	int32_t	index,
		const UnicodeString &	source,
		const UnicodeString &	target,
		UnicodeString &	result
	)

staticprotected

Non-mutexed internal method.

Internal:: Do not use. This API is for internal use only.

◆ _registerAlias()

static void icu::Transliterator::_registerAlias	(	const UnicodeString &	aliasID,
		const UnicodeString &	realID
	)

staticprotected

Internal:: Do not use. This API is for internal use only.

◆ _registerFactory()

static void icu::Transliterator::_registerFactory	(	const UnicodeString &	id,
		Factory	factory,
		Token	context
	)

staticprotected

Parameters

id	the ID being registered
factory	a function pointer that will be copied and called later when the given ID is passed to createInstance()
context	a context pointer that will be stored and later passed to the factory function when an ID matching the registration ID is being instantiated with this factory.

Internal:: Do not use. This API is for internal use only.

◆ _registerInstance()

static void icu::Transliterator::_registerInstance ( Transliterator * adoptedObj )

staticprotected

Internal:: Do not use. This API is for internal use only.

◆ _registerSpecialInverse()

static void icu::Transliterator::_registerSpecialInverse	(	const UnicodeString &	target,
		const UnicodeString &	inverseTarget,
		UBool	bidirectional
	)

staticprotected

Register two targets as being inverses of one another.

For example, calling registerSpecialInverse("NFC", "NFD", true) causes Transliterator to form the following inverse relationships:

NFC => NFD
Any-NFC => Any-NFD
NFD => NFC
Any-NFD => Any-NFC

(Without the special inverse registration, the inverse of NFC would be NFC-Any.) Note that NFD is shorthand for Any-NFD, but that the presence or absence of "Any-" is preserved.

The relationship is symmetrical; registering (a, b) is equivalent to registering (b, a).

The relevant IDs must still be registered separately as factories or classes.

Only the targets are specified. Special inverses always have the form Any-Target1 <=> Any-Target2. The target should have canonical casing (the casing desired to be produced when an inverse is formed) and should contain no whitespace or other extraneous characters.

Parameters

target	the target against which to register the inverse
inverseTarget	the inverse of target, that is Any-target.getInverse() => Any-inverseTarget
bidirectional	if true, register the reverse relation as well, that is, Any-inverseTarget.getInverse() => Any-target

Internal:: Do not use. This API is for internal use only.

◆ adoptFilter()

void icu::Transliterator::adoptFilter ( UnicodeFilter * adoptedFilter )

Changes the filter used by this transliterator.

If the filter is set to null then no filtering will occur.

Callers must take care if a transliterator is in use by multiple threads. The filter should not be changed by one thread while another thread may be transliterating.

Parameters

adoptedFilter the new filter to be adopted.

Stable:: ICU 2.0

◆ clone()

virtual Transliterator * icu::Transliterator::clone ( ) const

virtual

Implements Cloneable.

All subclasses are encouraged to implement this method if it is possible and reasonable to do so. Subclasses that are to be registered with the system using registerInstance() are required to implement this method. If a subclass does not implement clone() properly and is registered with the system using registerInstance(), then the default clone() implementation will return null, and calls to createInstance() will fail.

Returns: a copy of the object.

See also: registerInstance

Stable:: ICU 2.0

◆ countAvailableIDs()

static int32_t icu::Transliterator::countAvailableIDs ( )

static

Return the number of IDs currently registered with the system.

To retrieve the actual IDs, call getAvailableID(i) with i from 0 to countAvailableIDs() - 1.

Returns: the number of IDs currently registered with the system.

Obsolete:: ICU 3.4 use getAvailableIDs() instead

◆ countAvailableSources()

static int32_t icu::Transliterator::countAvailableSources ( )

static

Return the number of registered source specifiers.

Returns: the number of registered source specifiers.

Stable:: ICU 2.0

◆ countAvailableTargets()

static int32_t icu::Transliterator::countAvailableTargets ( const UnicodeString & source )

static

Return the number of registered target specifiers for a given source specifier.

Parameters

source the given source specifier.

Returns: the number of registered target specifiers for a given source specifier.

Stable:: ICU 2.0

◆ countAvailableVariants()

static int32_t icu::Transliterator::countAvailableVariants	(	const UnicodeString &	source,
		const UnicodeString &	target
	)

static

Return the number of registered variant specifiers for a given source-target pair.

Parameters

source	the source specifiers.
target	the target specifiers.

Stable:: ICU 2.0

◆ countElements()

int32_t icu::Transliterator::countElements ( ) const

Return the number of elements that make up this transliterator.

For example, if the transliterator "NFD;Jamo-Latin;Latin-Greek" were created, the return value of this method would be 3.

If this transliterator is not composed of other transliterators, then this method returns 1.

Returns: the number of transliterators that compose this transliterator, or 1 if this transliterator is not composed of multiple transliterators

Stable:: ICU 3.0

◆ createBasicInstance()

static Transliterator * icu::Transliterator::createBasicInstance	(	const UnicodeString &	id,
		const UnicodeString *	canon
	)

staticprotected

Create a transliterator from a basic ID.

This is an ID containing only the forward direction source, target, and variant.

Parameters

id	a basic ID of the form S-T or S-T/V.
canon	canonical ID to assign to the object, or nullptr to leave the ID unchanged

Returns: a newly created Transliterator or null if the ID is invalid.

Stable:: ICU 2.4

◆ createFromRules()

static Transliterator * icu::Transliterator::createFromRules	(	const UnicodeString &	ID,
		const UnicodeString &	rules,
		UTransDirection	dir,
		UParseError &	parseError,
		UErrorCode &	status
	)

static

Returns a Transliterator object constructed from the given rule string.

This will be a rule-based Transliterator, if the rule string contains only rules, or a compound Transliterator, if it contains ID blocks, or a null Transliterator, if it contains ID blocks which parse as empty for the given direction.

Parameters

ID	the id for the transliterator.
rules	rules, separated by ';'
dir	either FORWARD or REVERSE.
parseError	Struct to receive information on position of error if an error is encountered
status	Output param set to success/failure code.

Returns: a newly created Transliterator

Stable:: ICU 2.0

◆ createInstance() [1/2]

static Transliterator * icu::Transliterator::createInstance	(	const UnicodeString &	ID,
		UTransDirection	dir,
		UErrorCode &	status
	)

static

Returns a Transliterator object given its ID.

The ID must be either a system transliterator ID or a ID registered using registerInstance().

Parameters

ID	a valid ID, as enumerated by `getAvailableIDs()`
dir	either FORWARD or REVERSE.
status	Output param to filled in with a success or an error.

Returns: A Transliterator object with the given ID

Stable:: ICU 2.0

◆ createInstance() [2/2]

static Transliterator * icu::Transliterator::createInstance	(	const UnicodeString &	ID,
		UTransDirection	dir,
		UParseError &	parseError,
		UErrorCode &	status
	)

static

Returns a Transliterator object given its ID.

The ID must be either a system transliterator ID or a ID registered using registerInstance().

Parameters

ID	a valid ID, as enumerated by `getAvailableIDs()`
dir	either FORWARD or REVERSE.
parseError	Struct to receive information on position of error if an error is encountered
status	Output param to filled in with a success or an error.

Returns: A Transliterator object with the given ID

See also: registerInstance; getAvailableIDs; getID

Stable:: ICU 2.0

◆ createInverse()

Transliterator * icu::Transliterator::createInverse ( UErrorCode & status ) const

Returns this transliterator's inverse.

See the class documentation for details. This implementation simply inverts the two entities in the ID and attempts to retrieve the resulting transliterator. That is, if getID() returns "A-B", then this method will return the result of createInstance("B-A"), or null if that call fails.

Subclasses with knowledge of their inverse may wish to override this method.

Parameters

status Output param to filled in with a success or an error.

Returns: a transliterator that is an inverse, not necessarily exact, of this transliterator, or null if no such transliterator is registered.

See also: registerInstance

Stable:: ICU 2.0

◆ filteredTransliterate()

virtual void icu::Transliterator::filteredTransliterate	(	Replaceable &	text,
		UTransPosition &	index,
		UBool	incremental
	)		const

virtual

Transliterate a substring of text, as specified by index, taking filters into account.

This method is for subclasses that need to delegate to another transliterator.

Parameters

text	the text to be transliterated
index	the position indices
incremental	if true, then assume more characters may be inserted at index.limit, and postpone processing to accommodate future incoming characters

Stable:: ICU 2.4

◆ finishTransliteration()

virtual void icu::Transliterator::finishTransliteration	(	Replaceable &	text,
		UTransPosition &	index
	)		const

virtual

Finishes any pending transliterations that were waiting for more characters.

Clients should call this method as the last call after a sequence of one or more calls to transliterate().

Parameters

text	the buffer holding transliterated and untransliterated text.
index	the array of indices previously passed to `transliterate`

Stable:: ICU 2.0

◆ getAvailableID()

static const UnicodeString & icu::Transliterator::getAvailableID ( int32_t index )

static

Return the index-th available ID.

index must be between 0 and countAvailableIDs() - 1, inclusive. If index is out of range, the result of getAvailableID(0) is returned.

Parameters

index the given ID index.

Returns: the index-th available ID. index must be between 0 and countAvailableIDs() - 1, inclusive. If index is out of range, the result of getAvailableID(0) is returned.

Obsolete:: ICU 3.4 use getAvailableIDs() instead; this function is not thread safe, since it returns a reference to storage that may become invalid if another thread calls unregister

◆ getAvailableIDs()

static StringEnumeration * icu::Transliterator::getAvailableIDs ( UErrorCode & ec )

static

Return a StringEnumeration over the IDs available at the time of the call, including user-registered IDs.

Parameters

ec	input-output error code

Returns: a newly-created StringEnumeration over the transliterators available at the time of the call. The caller should delete this object when done using it.

Stable:: ICU 3.0

◆ getAvailableSource()

static UnicodeString & icu::Transliterator::getAvailableSource	(	int32_t	index,
		UnicodeString &	result
	)

static

Return a registered source specifier.

Parameters

index	which specifier to return, from 0 to n-1, where n = countAvailableSources()
result	fill-in parameter to receive the source specifier. If index is out of range, result will be empty.

Returns: reference to result

Stable:: ICU 2.0

◆ getAvailableTarget()

static UnicodeString & icu::Transliterator::getAvailableTarget	(	int32_t	index,
		const UnicodeString &	source,
		UnicodeString &	result
	)

static

Return a registered target specifier for a given source.

Parameters

index	which specifier to return, from 0 to n-1, where n = countAvailableTargets(source)
source	the source specifier
result	fill-in parameter to receive the target specifier. If source is invalid or if index is out of range, result will be empty.

Returns: reference to result

Stable:: ICU 2.0

◆ getAvailableVariant()

static UnicodeString & icu::Transliterator::getAvailableVariant	(	int32_t	index,
		const UnicodeString &	source,
		const UnicodeString &	target,
		UnicodeString &	result
	)

static

Return a registered variant specifier for a given source-target pair.

Parameters

index	which specifier to return, from 0 to n-1, where n = countAvailableVariants(source, target)
source	the source specifier
target	the target specifier
result	fill-in parameter to receive the variant specifier. If source is invalid or if target is invalid or if index is out of range, result will be empty.

Returns: reference to result

Stable:: ICU 2.0

◆ getDisplayName() [1/2]

static UnicodeString & icu::Transliterator::getDisplayName	(	const UnicodeString &	ID,
		const Locale &	inLocale,
		UnicodeString &	result
	)

static

Returns a name for this transliterator that is appropriate for display to the user in the given locale.

This name is taken from the locale resource data in the standard manner of the java.text package.

If no localized names exist in the system resource bundles, a name is synthesized using a localized MessageFormat pattern from the resource data. The arguments to this pattern are an integer followed by one or two strings. The integer is the number of strings, either 1 or 2. The strings are formed by splitting the ID for this transliterator at the first '-'. If there is no '-', then the entire ID forms the only string.

Parameters

ID	the string identifier for this transliterator
inLocale	the Locale in which the display name should be localized.
result	Output param to receive the display name

Returns: A reference to 'result'.

Stable:: ICU 2.0

◆ getDisplayName() [2/2]

static UnicodeString & icu::Transliterator::getDisplayName	(	const UnicodeString &	ID,
		UnicodeString &	result
	)

static

Returns a name for this transliterator that is appropriate for display to the user in the default locale.

See getDisplayName for details.

Parameters

ID	the string identifier for this transliterator
result	Output param to receive the display name

Returns: A reference to 'result'.

Stable:: ICU 2.0

◆ getDynamicClassID()

virtual UClassID icu::Transliterator::getDynamicClassID ( ) const

overridepure virtual

Returns a unique class ID polymorphically.

This method is to implement a simple version of RTTI, since not all C++ compilers support genuine RTTI. Polymorphic operator==() and clone() methods call this method.

Concrete subclasses of Transliterator must use the UOBJECT_DEFINE_RTTI_IMPLEMENTATION macro from uobject.h to provide the RTTI functions.

Returns: The class ID for this object. All objects of a given class have the same class ID. Objects of other classes have different class IDs.

Stable:: ICU 2.0

Reimplemented from icu::UObject.

◆ getElement()

const Transliterator & icu::Transliterator::getElement	(	int32_t	index,
		UErrorCode &	ec
	)		const

Return an element that makes up this transliterator.

For example, if the transliterator "NFD;Jamo-Latin;Latin-Greek" were created, the return value of this method would be one of the three transliterator objects that make up that transliterator: [NFD, Jamo-Latin, Latin-Greek].

If this transliterator is not composed of other transliterators, then this method will return a reference to this transliterator when given the index 0.

Parameters

index	a value from 0..countElements()-1 indicating the transliterator to return
ec	input-output error code

Returns: one of the transliterators that makes up this transliterator, if this transliterator is made up of multiple transliterators, otherwise a reference to this object if given an index of 0

Stable:: ICU 3.0

◆ getFilter()

const UnicodeFilter * icu::Transliterator::getFilter ( ) const

Returns the filter used by this transliterator, or nullptr if this transliterator uses no filter.

Returns: the filter used by this transliterator, or nullptr if this transliterator uses no filter.

Stable:: ICU 2.0

◆ getID()

virtual const UnicodeString & icu::Transliterator::getID ( ) const

virtual

Returns a programmatic identifier for this transliterator.

If this identifier is passed to createInstance(), it will return this object, if it has been registered.

Returns: a programmatic identifier for this transliterator.

See also: registerInstance; registerFactory; getAvailableIDs

Stable:: ICU 2.0

◆ getMaximumContextLength()

int32_t icu::Transliterator::getMaximumContextLength ( ) const

inline

Returns the length of the longest context required by this transliterator.

This is preceding context. The default implementation supplied by Transliterator returns zero; subclasses that use preceding context should override this method to return the correct value. For example, if a transliterator translates "ddd" (where d is any digit) to "555" when preceded by "(ddd)", then the preceding context length is 5, the length of "(ddd)".

Returns: The maximum number of preceding context characters this transliterator needs to examine

Stable:: ICU 2.0

Definition at line 1562 of file translit.h.

◆ getSourceSet()

UnicodeSet & icu::Transliterator::getSourceSet ( UnicodeSet & result ) const

Returns the set of all characters that may be modified in the input text by this Transliterator.

This incorporates this object's current filter; if the filter is changed, the return value of this function will change. The default implementation returns an empty set. Some subclasses may override handleGetSourceSet to return a more precise result. The return result is approximate in any case and is intended for use by tests, tools, or utilities.

Parameters

result receives result set; previous contents lost

Returns: a reference to result

See also: getTargetSet; handleGetSourceSet

Stable:: ICU 2.4

◆ getStaticClassID()

static UClassID icu::Transliterator::getStaticClassID ( )

static

Return the class ID for this class.

This is useful only for comparing to a return value from getDynamicClassID(). Note that Transliterator is an abstract base class, and therefor no fully constructed object will have a dynamic UCLassID that equals the UClassID returned from TRansliterator::getStaticClassID().

Returns: The class ID for class Transliterator.

Stable:: ICU 2.0

◆ getTargetSet()

virtual UnicodeSet & icu::Transliterator::getTargetSet ( UnicodeSet & result ) const

virtual

Returns the set of all characters that may be generated as replacement text by this transliterator.

The default implementation returns the empty set. Some subclasses may override this method to return a more precise result. The return result is approximate in any case and is intended for use by tests, tools, or utilities requiring such meta-information.

Parameters

result receives result set; previous contents lost

Returns: a reference to result

See also: getTargetSet

Stable:: ICU 2.4

◆ handleGetSourceSet()

virtual void icu::Transliterator::handleGetSourceSet ( UnicodeSet & result ) const

virtual

Framework method that returns the set of all characters that may be modified in the input text by this Transliterator, ignoring the effect of this object's filter.

The base class implementation returns the empty set. Subclasses that wish to implement this should override this method.

Returns: the set of characters that this transliterator may modify. The set may be modified, so subclasses should return a newly-created object.

Parameters

result receives result set; previous contents lost

See also: getSourceSet; getTargetSet

Stable:: ICU 2.4

◆ handleTransliterate()

virtual void icu::Transliterator::handleTransliterate	(	Replaceable &	text,
		UTransPosition &	pos,
		UBool	incremental
	)		const

protectedpure virtual

Abstract method that concrete subclasses define to implement their transliteration algorithm.

This method handles both incremental and non-incremental transliteration. Let originalStart refer to the value of pos.start upon entry.

If incremental is false, then this method should transliterate all characters between pos.start and pos.limit. Upon return pos.start must == pos.limit.
If incremental is true, then this method should transliterate all characters between pos.start and pos.limit that can be unambiguously transliterated, regardless of future insertions of text at pos.limit. Upon return, pos.start should be in the range [originalStart, pos.limit). pos.start should be positioned such that characters [originalStart, pos.start) will not be changed in the future by this transliterator and characters [pos.start, pos.limit) are unchanged.

Implementations of this method should also obey the following invariants:

pos.limit and pos.contextLimit should be updated to reflect changes in length of the text between pos.start and pos.limit. The difference pos.contextLimit - pos.limit should not change.
pos.contextStart should not change.
Upon return, neither pos.start nor pos.limit should be less than originalStart.
Text before originalStart and text after pos.limit should not change.
Text before pos.contextStart and text after pos.contextLimit should be ignored.

Subclasses may safely assume that all characters in [pos.start, pos.limit) are filtered. In other words, the filter has already been applied by the time this method is called. See filteredTransliterate().

This method is not for public consumption. Calling this method directly will transliterate [pos.start, pos.limit) without applying the filter. End user code should call transliterate() instead of this method. Subclass code and wrapping transliterators should call filteredTransliterate() instead of this method.

Parameters

text	the buffer holding transliterated and untransliterated text
pos	the indices indicating the start, limit, context start, and context limit of the text.
incremental	if true, assume more text may be inserted at `pos.limit` and act accordingly. Otherwise, transliterate all text between `pos.start` and `pos.limit` and move `pos.start` up to `pos.limit`.

See also: transliterate

Stable:: ICU 2.4

◆ integerToken()

Transliterator::Token icu::Transliterator::integerToken ( int32_t i )

inlinestatic

Return a token containing an integer.

Returns: a token containing an integer.

Internal:: Do not use. This API is for internal use only.

Definition at line 1574 of file translit.h.

◆ operator=()

Transliterator & icu::Transliterator::operator= ( const Transliterator & )

protected

Assignment operator.

Stable:: ICU 2.4

◆ orphanFilter()

UnicodeFilter * icu::Transliterator::orphanFilter ( )

Returns the filter used by this transliterator, or nullptr if this transliterator uses no filter.

The caller must eventually delete the result. After this call, this transliterator's filter is set to nullptr.

Returns: the filter used by this transliterator, or nullptr if this transliterator uses no filter.

Stable:: ICU 2.4

◆ pointerToken()

Transliterator::Token icu::Transliterator::pointerToken ( void * p )

inlinestatic

Return a token containing a pointer.

Returns: a token containing a pointer.

Internal:: Do not use. This API is for internal use only.

Definition at line 1580 of file translit.h.

◆ registerAlias()

static void icu::Transliterator::registerAlias	(	const UnicodeString &	aliasID,
		const UnicodeString &	realID
	)

static

Registers an ID string as an alias of another ID string.

That is, after calling this function, createInstance(aliasID) will return the same thing as createInstance(realID). This is generally used to create shorter, more mnemonic aliases for long compound IDs.

Parameters

aliasID	The new ID being registered.
realID	The ID that the new ID is to be an alias for. This can be a compound ID and can include filters and should refer to transliterators that have already been registered with the framework, although this isn't checked.

Stable:: ICU 3.6

◆ registerFactory()

static void icu::Transliterator::registerFactory	(	const UnicodeString &	id,
		Factory	factory,
		Token	context
	)

static

Registers a factory function that creates transliterators of a given ID.

Because ICU may choose to cache Transliterators internally, this must be called at application startup, prior to any calls to Transliterator::createXXX to avoid undefined behavior.

Parameters

id	the ID being registered
factory	a function pointer that will be copied and called later when the given ID is passed to createInstance()
context	a context pointer that will be stored and later passed to the factory function when an ID matching the registration ID is being instantiated with this factory.

Stable:: ICU 2.0

◆ registerInstance()

static void icu::Transliterator::registerInstance ( Transliterator * adoptedObj )

static

Registers an instance obj of a subclass of Transliterator with the system.

When createInstance() is called with an ID string that is equal to obj->getID(), then obj->clone() is returned.

After this call the Transliterator class owns the adoptedObj and will delete it.

Because ICU may choose to cache Transliterators internally, this must be called at application startup, prior to any calls to Transliterator::createXXX to avoid undefined behavior.

Parameters

adoptedObj an instance of subclass of Transliterator that defines clone()

See also: createInstance; registerFactory; unregister

Stable:: ICU 2.0

◆ setID()

void icu::Transliterator::setID ( const UnicodeString & id )

inlineprotected

Set the ID of this transliterators.

Subclasses shouldn't do this, unless the underlying script behavior has changed.

Parameters

id	the new id t to be set.

Stable:: ICU 2.4

Definition at line 1566 of file translit.h.

References icu::UnicodeString::append(), and icu::UnicodeString::truncate().

◆ setMaximumContextLength()

void icu::Transliterator::setMaximumContextLength ( int32_t maxContextLength )

protected

Method for subclasses to use to set the maximum context length.

Parameters

maxContextLength the new value to be set.

See also: getMaximumContextLength

Stable:: ICU 2.4

◆ toRules()

virtual UnicodeString & icu::Transliterator::toRules	(	UnicodeString &	result,
		UBool	escapeUnprintable
	)		const

virtual

Create a rule string that can be passed to createFromRules() to recreate this transliterator.

Parameters

result	the string to receive the rules. Previous contents will be deleted.
escapeUnprintable	if true then convert unprintable character to their hex escape representations, \uxxxx or \Uxxxxxxxx. Unprintable characters are those other than U+000A, U+0020..U+007E.

Stable:: ICU 2.0

◆ transliterate() [1/5]

virtual void icu::Transliterator::transliterate ( Replaceable & text ) const

virtual

Transliterates an entire string in place.

Convenience method.

Parameters

text	the string to be transliterated

Stable:: ICU 2.0

◆ transliterate() [2/5]

virtual int32_t icu::Transliterator::transliterate	(	Replaceable &	text,
		int32_t	start,
		int32_t	limit
	)		const

virtual

Transliterates a segment of a string, with optional filtering.

Parameters

text	the string to be transliterated
start	the beginning index, inclusive; `0 <= start <= limit`.
limit	the ending index, exclusive; `start <= limit <= text.length()`.

Returns: The new limit index. The text previously occupying [start, limit) has been transliterated, possibly to a string of a different length, at [start, new-limit), where new-limit is the return value. If the input offsets are out of bounds, the returned value is -1 and the input string remains unchanged.

Stable:: ICU 2.0

◆ transliterate() [3/5]

virtual void icu::Transliterator::transliterate	(	Replaceable &	text,
		UTransPosition &	index,
		const UnicodeString &	insertion,
		UErrorCode &	status
	)		const

virtual

Transliterates the portion of the text buffer that can be transliterated unambiguosly after new text has been inserted, typically as a result of a keyboard event.

The new text in insertion will be inserted into text at index.limit, advancing index.limit by insertion.length(). Then the transliterator will try to transliterate characters of text between index.cursor and index.limit. Characters before index.cursor will not be changed.

Upon return, values in index will be updated. index.start will be advanced to the first character that future calls to this method will read. index.cursor and index.limit will be adjusted to delimit the range of text that future calls to this method may change.

Typical usage of this method begins with an initial call with index.start and index.limit set to indicate the portion of text to be transliterated, and index.cursor == index.start. Thereafter, index can be used without modification in future calls, provided that all changes to text are made via this method.

This method assumes that future calls may be made that will insert new text into the buffer. As a result, it only performs unambiguous transliterations. After the last call to this method, there may be untransliterated text that is waiting for more input to resolve an ambiguity. In order to perform these pending transliterations, clients should call finishTransliteration after the last call to this method has been made.

Parameters

text	the buffer holding transliterated and untransliterated text
index	an array of three integers.

index.start: the beginning index, inclusive; 0 <= index.start <= index.limit.
index.limit: the ending index, exclusive; index.start <= index.limit <= text.length(). insertion is inserted at index.limit.
index.cursor: the next character to be considered for transliteration; index.start <= index.cursor <= index.limit. Characters before index.cursor will not be changed by future calls to this method.

Parameters

insertion	text to be inserted and possibly transliterated into the translation buffer at `index.limit`. If `null` then no text is inserted.
status	Output param to filled in with a success or an error.

See also: handleTransliterate

Exceptions

IllegalArgumentException if index is invalid

See also: UTransPosition

Stable:: ICU 2.0

◆ transliterate() [4/5]

virtual void icu::Transliterator::transliterate	(	Replaceable &	text,
		UTransPosition &	index,
		UChar32	insertion,
		UErrorCode &	status
	)		const

virtual

Transliterates the portion of the text buffer that can be transliterated unambiguosly after a new character has been inserted, typically as a result of a keyboard event.

This is a convenience method.

Parameters

text	the buffer holding transliterated and untransliterated text
index	an array of three integers.
insertion	text to be inserted and possibly transliterated into the translation buffer at `index.limit`.
status	Output param to filled in with a success or an error.

See also: transliterate(Replaceable&, UTransPosition&, const UnicodeString&, UErrorCode&) const

Stable:: ICU 2.0

◆ transliterate() [5/5]

virtual void icu::Transliterator::transliterate	(	Replaceable &	text,
		UTransPosition &	index,
		UErrorCode &	status
	)		const

virtual

Transliterates the portion of the text buffer that can be transliterated unambiguosly.

This is a convenience method; see transliterate(Replaceable&, UTransPosition&, const UnicodeString&, UErrorCode&) const for details.

Parameters

text	the buffer holding transliterated and untransliterated text
index	an array of three integers.
status	Output param to filled in with a success or an error.

See also: transliterate(Replaceable&, UTransPosition&, const UnicodeString&, UErrorCode &) const

Stable:: ICU 2.0

◆ unregister()

static void icu::Transliterator::unregister ( const UnicodeString & ID )

static

Unregisters a transliterator or class.

This may be either a system transliterator or a user transliterator or class. Any attempt to construct an unregistered transliterator based on its ID will fail.

Because ICU may choose to cache Transliterators internally, this should be called during application shutdown, after all calls to Transliterator::createXXX to avoid undefined behavior.

Parameters

ID	the ID of the transliterator or class

Returns: the Object that was registered with ID, or null if none was

See also: registerInstance; registerFactory

Stable:: ICU 2.0

Friends And Related Symbol Documentation

◆ TransliteratorAlias

friend class TransliteratorAlias

friend

Definition at line 603 of file translit.h.

◆ TransliteratorIDParser

friend class TransliteratorIDParser

friend

Definition at line 602 of file translit.h.

◆ TransliteratorParser

friend class TransliteratorParser

friend

Definition at line 601 of file translit.h.

The documentation for this class was generated from the following file:

i18n/unicode/translit.h

Data Structures

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Static Protected Member Functions

Friends

Detailed Description

Member Typedef Documentation

◆ Factory

Constructor & Destructor Documentation

◆ Transliterator() [1/2]

◆ Transliterator() [2/2]

◆ ~Transliterator()

Member Function Documentation

◆ _countAvailableSources()

◆ _countAvailableTargets()

◆ _countAvailableVariants()

◆ _getAvailableSource()

◆ _getAvailableTarget()

◆ _getAvailableVariant()

◆ _registerAlias()

◆ _registerFactory()

◆ _registerInstance()

◆ _registerSpecialInverse()

◆ adoptFilter()

◆ clone()

◆ countAvailableIDs()

◆ countAvailableSources()

◆ countAvailableTargets()

◆ countAvailableVariants()

◆ countElements()

◆ createBasicInstance()

◆ createFromRules()

◆ createInstance() [1/2]

◆ createInstance() [2/2]

◆ createInverse()

◆ filteredTransliterate()

◆ finishTransliteration()

◆ getAvailableID()

◆ getAvailableIDs()

◆ getAvailableSource()

◆ getAvailableTarget()

◆ getAvailableVariant()

◆ getDisplayName() [1/2]

◆ getDisplayName() [2/2]

◆ getDynamicClassID()

◆ getElement()

◆ getFilter()

◆ getID()

◆ getMaximumContextLength()

◆ getSourceSet()

◆ getStaticClassID()

◆ getTargetSet()

◆ handleGetSourceSet()

◆ handleTransliterate()

◆ integerToken()

◆ operator=()

◆ orphanFilter()

◆ pointerToken()

◆ registerAlias()

◆ registerFactory()

◆ registerInstance()

◆ setID()

◆ setMaximumContextLength()

◆ toRules()

◆ transliterate() [1/5]

◆ transliterate() [2/5]

◆ transliterate() [3/5]

◆ transliterate() [4/5]

◆ transliterate() [5/5]

◆ unregister()

Friends And Related Symbol Documentation

◆ TransliteratorAlias

◆ TransliteratorIDParser

◆ TransliteratorParser