[apple/icu.git] / icuSources / i18n / anytrans.cpp

/*
*****************************************************************
* Copyright (c) 2002-2016 International Business Machines Corporation
* and others.  All Rights Reserved.
*****************************************************************
* Date        Name        Description
* 06/06/2002  aliu        Creation.
*****************************************************************
*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_TRANSLITERATION

#include "unicode/uobject.h"
#include "unicode/uscript.h"

#include "anytrans.h"
#include "hash.h"
#include "mutex.h"
#include "nultrans.h"
#include "putilimp.h"
#include "tridpars.h"
#include "uinvchar.h"
#include "uvector.h"

//------------------------------------------------------------
// Constants

static const UChar TARGET_SEP = 45; // '-'
static const UChar VARIANT_SEP = 47; // '/'
static const UChar ANY[] = {0x41,0x6E,0x79,0}; // "Any"
static const UChar NULL_ID[] = {78,117,108,108,0}; // "Null"
static const UChar LATIN_PIVOT[] = {0x2D,0x4C,0x61,0x74,0x6E,0x3B,0x4C,0x61,0x74,0x6E,0x2D,0}; // "-Latn;Latn-"

// initial size for an Any-XXXX transform's cache of script-XXXX transforms
// (will grow as necessary, but we don't expect to have source text wit more than 7 scripts)
#define ANY_TRANS_CACHE_INIT_SIZE 7

//------------------------------------------------------------

U_CDECL_BEGIN
/**
 * Deleter function for Transliterator*.
 */
static void U_CALLCONV
_deleteTransliterator(void *obj) {
    delete (icu::Transliterator*) obj;
}
U_CDECL_END

//------------------------------------------------------------

U_NAMESPACE_BEGIN

//------------------------------------------------------------
// ScriptRunIterator

/**
 * Returns a series of ranges corresponding to scripts. They will be
 * of the form:
 *
 * ccccSScSSccccTTcTcccc   - c = common, S = first script, T = second
 * |            |          - first run (start, limit)
 *          |           |  - second run (start, limit)
 *
 * That is, the runs will overlap. The reason for this is so that a
 * transliterator can consider common characters both before and after
 * the scripts.
 */
class ScriptRunIterator : public UMemory {
private:
    const Replaceable& text;
    int32_t textStart;
    int32_t textLimit;

public:
    /**
     * The code of the current run, valid after next() returns.  May
     * be USCRIPT_INVALID_CODE if and only if the entire text is
     * COMMON/INHERITED.
     */
    UScriptCode scriptCode;

    /**
     * The start of the run, inclusive, valid after next() returns.
     */
    int32_t start;

    /**
     * The end of the run, exclusive, valid after next() returns.
     */
    int32_t limit;

    /**
     * Constructs a run iterator over the given text from start
     * (inclusive) to limit (exclusive).
     */
    ScriptRunIterator(const Replaceable& text, int32_t start, int32_t limit);

    /**
     * Returns TRUE if there are any more runs.  TRUE is always
     * returned at least once.  Upon return, the caller should
     * examine scriptCode, start, and limit.
     */
    UBool next();

    /**
     * Adjusts internal indices for a change in the limit index of the
     * given delta.  A positive delta means the limit has increased.
     */
    void adjustLimit(int32_t delta);

private:
    ScriptRunIterator(const ScriptRunIterator &other); // forbid copying of this class
    ScriptRunIterator &operator=(const ScriptRunIterator &other); // forbid copying of this class
};

ScriptRunIterator::ScriptRunIterator(const Replaceable& theText,
                                     int32_t myStart, int32_t myLimit) :
    text(theText)
{
    textStart = myStart;
    textLimit = myLimit;
    limit = myStart;
}

UBool ScriptRunIterator::next() {
    UChar32 ch;
    UScriptCode s;
    UErrorCode ec = U_ZERO_ERROR;

    scriptCode = USCRIPT_INVALID_CODE; // don't know script yet
    start = limit;

    // Are we done?
    if (start == textLimit) {
        return FALSE;
    }

    // Move start back to include adjacent COMMON or INHERITED
    // characters
    while (start > textStart) {
        ch = text.char32At(start - 1); // look back
        s = uscript_getScript(ch, &ec);
        if (s == USCRIPT_COMMON || s == USCRIPT_INHERITED) {
            --start;
        } else {
            break;
        }
    }

    // Move limit ahead to include COMMON, INHERITED, and characters
    // of the current script.
    while (limit < textLimit) {
        ch = text.char32At(limit); // look ahead
        s = uscript_getScript(ch, &ec);
        if (s != USCRIPT_COMMON && s != USCRIPT_INHERITED) {
            if (scriptCode == USCRIPT_INVALID_CODE) {
                scriptCode = s;
            } else if (s != scriptCode) {
                break;
            }
        }
        ++limit;
    }

    // Return TRUE even if the entire text is COMMON / INHERITED, in
    // which case scriptCode will be USCRIPT_INVALID_CODE.
    return TRUE;
}

void ScriptRunIterator::adjustLimit(int32_t delta) {
    limit += delta;
    textLimit += delta;
}

//------------------------------------------------------------
// AnyTransliterator

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(AnyTransliterator)

AnyTransliterator::AnyTransliterator(const UnicodeString& id,
                                     const UnicodeString& theTarget,
                                     const UnicodeString& theVariant,
                                     UScriptCode theTargetScript,
                                     UErrorCode& ec) :
    Transliterator(id, NULL),
    targetScript(theTargetScript)
{
    cache = uhash_openSize(uhash_hashLong, uhash_compareLong, NULL, ANY_TRANS_CACHE_INIT_SIZE, &ec);
    if (U_FAILURE(ec)) {
        return;
    }
    uhash_setValueDeleter(cache, _deleteTransliterator);

    target = theTarget;
    if (theVariant.length() > 0) {
        target.append(VARIANT_SEP).append(theVariant);
    }
}

AnyTransliterator::~AnyTransliterator() {
    uhash_close(cache);
}

/**
 * Copy constructor.
 */
AnyTransliterator::AnyTransliterator(const AnyTransliterator& o) :
    Transliterator(o),
    target(o.target),
    targetScript(o.targetScript)
{
    // Don't copy the cache contents
    UErrorCode ec = U_ZERO_ERROR;
    cache = uhash_openSize(uhash_hashLong, uhash_compareLong, NULL, ANY_TRANS_CACHE_INIT_SIZE, &ec);
    if (U_FAILURE(ec)) {
        return;
    }
    uhash_setValueDeleter(cache, _deleteTransliterator);
}

/**
 * Transliterator API.
 */
Transliterator* AnyTransliterator::clone() const {
    return new AnyTransliterator(*this);
}

/**
 * Implements {@link Transliterator#handleTransliterate}.
 */
void AnyTransliterator::handleTransliterate(Replaceable& text, UTransPosition& pos,
                                            UBool isIncremental) const {
    int32_t allStart = pos.start;
    int32_t allLimit = pos.limit;

    ScriptRunIterator it(text, pos.contextStart, pos.contextLimit);

    while (it.next()) {
        // Ignore runs in the ante context
        if (it.limit <= allStart) continue;

        // Try to instantiate transliterator from it.scriptCode to
        // our target or target/variant
        Transliterator* t = getTransliterator(it.scriptCode);

        if (t == NULL) {
            // We have no transliterator.  Do nothing, but keep
            // pos.start up to date.
            pos.start = it.limit;
            continue;
        }

        // If the run end is before the transliteration limit, do
        // a non-incremental transliteration.  Otherwise do an
        // incremental one.
        UBool incremental = isIncremental && (it.limit >= allLimit);

        pos.start = uprv_max(allStart, it.start);
        pos.limit = uprv_min(allLimit, it.limit);
        int32_t limit = pos.limit;
        t->filteredTransliterate(text, pos, incremental);
        int32_t delta = pos.limit - limit;
        allLimit += delta;
        it.adjustLimit(delta);

        // We're done if we enter the post context
        if (it.limit >= allLimit) break;
    }

    // Restore limit.  pos.start is fine where the last transliterator
    // left it, or at the end of the last run.
    pos.limit = allLimit;
}

Transliterator* AnyTransliterator::getTransliterator(UScriptCode source) const {

    if (source == targetScript || source == USCRIPT_INVALID_CODE) {
        return NULL;
    }

    Transliterator* t = NULL;
    {
        Mutex m(NULL);
        t = (Transliterator*) uhash_iget(cache, (int32_t) source);
    }
    if (t == NULL) {
        UErrorCode ec = U_ZERO_ERROR;
        UnicodeString sourceName(uscript_getShortName(source), -1, US_INV);
        UnicodeString id(sourceName);
        id.append(TARGET_SEP).append(target);

        t = Transliterator::createInstance(id, UTRANS_FORWARD, ec);
        if (U_FAILURE(ec) || t == NULL) {
            delete t;

            // Try to pivot around Latin, our most common script
            id = sourceName;
            id.append(LATIN_PIVOT, -1).append(target);
            t = Transliterator::createInstance(id, UTRANS_FORWARD, ec);
            if (U_FAILURE(ec) || t == NULL) {
                delete t;
                t = NULL;
            }
        }

        if (t != NULL) {
            Transliterator *rt = NULL;
            {
                Mutex m(NULL);
                rt = static_cast<Transliterator *> (uhash_iget(cache, (int32_t) source));
                if (rt == NULL) {
                    // Common case, no race to cache this new transliterator.
                    uhash_iput(cache, (int32_t) source, t, &ec);
                } else {
                    // Race case, some other thread beat us to caching this transliterator.
                    Transliterator *temp = rt;
                    rt = t;    // Our newly created transliterator that lost the race & now needs deleting.
                    t  = temp; // The transliterator from the cache that we will return.
                }
            }
            delete rt;    // will be non-null only in case of races.
        }
    }
    return t;
}

/**
 * Return the script code for a given name, or -1 if not found.
 */
static UScriptCode scriptNameToCode(const UnicodeString& name) {
    char buf[128];
    UScriptCode code;
    UErrorCode ec = U_ZERO_ERROR;
    int32_t nameLen = name.length();
    UBool isInvariant = uprv_isInvariantUString(name.getBuffer(), nameLen);

    if (isInvariant) {
        name.extract(0, nameLen, buf, (int32_t)sizeof(buf), US_INV);
        buf[127] = 0;   // Make sure that we NULL terminate the string.
    }
    if (!isInvariant || uscript_getCode(buf, &code, 1, &ec) != 1 || U_FAILURE(ec))
    {
        code = USCRIPT_INVALID_CODE;
    }
    return code;
}

/**
 * Registers standard transliterators with the system.  Called by
 * Transliterator during initialization.  Scan all current targets and
 * register those that are scripts T as Any-T/V.
 */
void AnyTransliterator::registerIDs() {

    UErrorCode ec = U_ZERO_ERROR;
    Hashtable seen(TRUE, ec);

    int32_t sourceCount = Transliterator::_countAvailableSources();
    for (int32_t s=0; s<sourceCount; ++s) {
        UnicodeString source;
        Transliterator::_getAvailableSource(s, source);

        // Ignore the "Any" source
        if (source.caseCompare(ANY, 3, 0 /*U_FOLD_CASE_DEFAULT*/) == 0) continue;

        int32_t targetCount = Transliterator::_countAvailableTargets(source);
        for (int32_t t=0; t<targetCount; ++t) {
            UnicodeString target;
            Transliterator::_getAvailableTarget(t, source, target);

            // Only process each target once
            if (seen.geti(target) != 0) continue;
            ec = U_ZERO_ERROR;
            seen.puti(target, 1, ec);

            // Get the script code for the target.  If not a script, ignore.
            UScriptCode targetScript = scriptNameToCode(target);
            if (targetScript == USCRIPT_INVALID_CODE) continue;

            int32_t variantCount = Transliterator::_countAvailableVariants(source, target);
            // assert(variantCount >= 1);
            for (int32_t v=0; v<variantCount; ++v) {
                UnicodeString variant;
                Transliterator::_getAvailableVariant(v, source, target, variant);

                UnicodeString id;
                TransliteratorIDParser::STVtoID(UnicodeString(TRUE, ANY, 3), target, variant, id);
                ec = U_ZERO_ERROR;
                AnyTransliterator* t = new AnyTransliterator(id, target, variant,
                                                             targetScript, ec);
                if (U_FAILURE(ec)) {
                    delete t;
                } else {
                    Transliterator::_registerInstance(t);
                    Transliterator::_registerSpecialInverse(target, UnicodeString(TRUE, NULL_ID, 4), FALSE);
                }
            }
        }
    }
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_TRANSLITERATION */

//eof
Commit	Line	Data
b75a7d8f A	1	/*
b75a7d8f A	2	*****************************************************************
2ca993e8	3	* Copyright (c) 2002-2016 International Business Machines Corporation
b75a7d8f A	4	* and others. All Rights Reserved.
	5	*****************************************************************
	6	* Date Name Description
	7	* 06/06/2002 aliu Creation.
	8	*****************************************************************
	9	*/
	10
	11	#include "unicode/utypes.h"
	12
	13	#if !UCONFIG_NO_TRANSLITERATION
	14
	15	#include "unicode/uobject.h"
	16	#include "unicode/uscript.h"
57a6839d	17
b75a7d8f	18	#include "anytrans.h"
b75a7d8f	19	#include "hash.h"
57a6839d A	20	#include "mutex.h"
57a6839d A	21	#include "nultrans.h"
374ca955	22	#include "putilimp.h"
57a6839d	23	#include "tridpars.h"
73c04bcf	24	#include "uinvchar.h"
57a6839d	25	#include "uvector.h"
b75a7d8f A	26
	27	//------------------------------------------------------------
	28	// Constants
	29
	30	static const UChar TARGET_SEP = 45; // '-'
	31	static const UChar VARIANT_SEP = 47; // '/'
2ca993e8	32	static const UChar ANY[] = {0x41,0x6E,0x79,0}; // "Any"
b75a7d8f	33	static const UChar NULL_ID[] = {78,117,108,108,0}; // "Null"
2ca993e8 A	34	static const UChar LATIN_PIVOT[] = {0x2D,0x4C,0x61,0x74,0x6E,0x3B,0x4C,0x61,0x74,0x6E,0x2D,0}; // "-Latn;Latn-"
	35
	36	// initial size for an Any-XXXX transform's cache of script-XXXX transforms
	37	// (will grow as necessary, but we don't expect to have source text wit more than 7 scripts)
	38	#define ANY_TRANS_CACHE_INIT_SIZE 7
b75a7d8f A	39
	40	//------------------------------------------------------------
	41
	42	U_CDECL_BEGIN
	43	/**
	44	* Deleter function for Transliterator*.
	45	*/
	46	static void U_CALLCONV
	47	_deleteTransliterator(void *obj) {
57a6839d	48	delete (icu::Transliterator*) obj;
b75a7d8f A	49	}
	50	U_CDECL_END
	51
	52	//------------------------------------------------------------
	53
	54	U_NAMESPACE_BEGIN
	55
	56	//------------------------------------------------------------
	57	// ScriptRunIterator
	58
	59	/**
	60	* Returns a series of ranges corresponding to scripts. They will be
	61	* of the form:
	62	*
	63	* ccccSScSSccccTTcTcccc - c = common, S = first script, T = second
	64	* \| \| - first run (start, limit)
	65	* \| \| - second run (start, limit)
	66	*
	67	* That is, the runs will overlap. The reason for this is so that a
	68	* transliterator can consider common characters both before and after
	69	* the scripts.
	70	*/
	71	class ScriptRunIterator : public UMemory {
	72	private:
	73	const Replaceable& text;
	74	int32_t textStart;
	75	int32_t textLimit;
	76
	77	public:
	78	/**
	79	* The code of the current run, valid after next() returns. May
	80	* be USCRIPT_INVALID_CODE if and only if the entire text is
	81	* COMMON/INHERITED.
	82	*/
	83	UScriptCode scriptCode;
	84
	85	/**
	86	* The start of the run, inclusive, valid after next() returns.
	87	*/
	88	int32_t start;
	89
	90	/**
	91	* The end of the run, exclusive, valid after next() returns.
	92	*/
	93	int32_t limit;
57a6839d	94
b75a7d8f A	95	/**
	96	* Constructs a run iterator over the given text from start
	97	* (inclusive) to limit (exclusive).
	98	*/
	99	ScriptRunIterator(const Replaceable& text, int32_t start, int32_t limit);
	100
	101	/**
	102	* Returns TRUE if there are any more runs. TRUE is always
	103	* returned at least once. Upon return, the caller should
	104	* examine scriptCode, start, and limit.
	105	*/
	106	UBool next();
	107
	108	/**
	109	* Adjusts internal indices for a change in the limit index of the
	110	* given delta. A positive delta means the limit has increased.
	111	*/
	112	void adjustLimit(int32_t delta);
	113
	114	private:
	115	ScriptRunIterator(const ScriptRunIterator &other); // forbid copying of this class
	116	ScriptRunIterator &operator=(const ScriptRunIterator &other); // forbid copying of this class
	117	};
	118
	119	ScriptRunIterator::ScriptRunIterator(const Replaceable& theText,
	120	int32_t myStart, int32_t myLimit) :
	121	text(theText)
	122	{
	123	textStart = myStart;
	124	textLimit = myLimit;
	125	limit = myStart;
	126	}
	127
	128	UBool ScriptRunIterator::next() {
	129	UChar32 ch;
	130	UScriptCode s;
	131	UErrorCode ec = U_ZERO_ERROR;
	132
	133	scriptCode = USCRIPT_INVALID_CODE; // don't know script yet
	134	start = limit;
	135
	136	// Are we done?
	137	if (start == textLimit) {
	138	return FALSE;
	139	}
	140
	141	// Move start back to include adjacent COMMON or INHERITED
	142	// characters
	143	while (start > textStart) {
	144	ch = text.char32At(start - 1); // look back
	145	s = uscript_getScript(ch, &ec);
	146	if (s == USCRIPT_COMMON \|\| s == USCRIPT_INHERITED) {
	147	--start;
	148	} else {
	149	break;
	150	}
	151	}
	152
	153	// Move limit ahead to include COMMON, INHERITED, and characters
	154	// of the current script.
	155	while (limit < textLimit) {
	156	ch = text.char32At(limit); // look ahead
	157	s = uscript_getScript(ch, &ec);
	158	if (s != USCRIPT_COMMON && s != USCRIPT_INHERITED) {
159	if (scriptCode == USCRIPT_INVALID_CODE) {
160	scriptCode = s;
161	} else if (s != scriptCode) {
162	break;
163	}
164	}
165	++limit;
166	}
167
168	// Return TRUE even if the entire text is COMMON / INHERITED, in
169	// which case scriptCode will be USCRIPT_INVALID_CODE.
170	return TRUE;
171	}
172
173	void ScriptRunIterator::adjustLimit(int32_t delta) {
174	limit += delta;
175	textLimit += delta;
176	}
177
178	//------------------------------------------------------------
179	// AnyTransliterator
180
374ca955	181	UOBJECT_DEFINE_RTTI_IMPLEMENTATION(AnyTransliterator)
b75a7d8f A	182
	183	AnyTransliterator::AnyTransliterator(const UnicodeString& id,
	184	const UnicodeString& theTarget,
	185	const UnicodeString& theVariant,
	186	UScriptCode theTargetScript,
	187	UErrorCode& ec) :
	188	Transliterator(id, NULL),
57a6839d	189	targetScript(theTargetScript)
b75a7d8f	190	{
2ca993e8	191	cache = uhash_openSize(uhash_hashLong, uhash_compareLong, NULL, ANY_TRANS_CACHE_INIT_SIZE, &ec);
46f4442e A	192	if (U_FAILURE(ec)) {
	193	return;
	194	}
b75a7d8f A	195	uhash_setValueDeleter(cache, _deleteTransliterator);
	196
	197	target = theTarget;
	198	if (theVariant.length() > 0) {
	199	target.append(VARIANT_SEP).append(theVariant);
	200	}
	201	}
	202
	203	AnyTransliterator::~AnyTransliterator() {
	204	uhash_close(cache);
	205	}
	206
	207	/**
	208	* Copy constructor.
	209	*/
	210	AnyTransliterator::AnyTransliterator(const AnyTransliterator& o) :
	211	Transliterator(o),
	212	target(o.target),
	213	targetScript(o.targetScript)
	214	{
	215	// Don't copy the cache contents
	216	UErrorCode ec = U_ZERO_ERROR;
2ca993e8	217	cache = uhash_openSize(uhash_hashLong, uhash_compareLong, NULL, ANY_TRANS_CACHE_INIT_SIZE, &ec);
46f4442e A	218	if (U_FAILURE(ec)) {
	219	return;
	220	}
b75a7d8f A	221	uhash_setValueDeleter(cache, _deleteTransliterator);
	222	}
	223
	224	/**
	225	* Transliterator API.
	226	*/
	227	Transliterator* AnyTransliterator::clone() const {
	228	return new AnyTransliterator(*this);
	229	}
	230
	231	/**
	232	* Implements {@link Transliterator#handleTransliterate}.
	233	*/
	234	void AnyTransliterator::handleTransliterate(Replaceable& text, UTransPosition& pos,
	235	UBool isIncremental) const {
	236	int32_t allStart = pos.start;
	237	int32_t allLimit = pos.limit;
	238
	239	ScriptRunIterator it(text, pos.contextStart, pos.contextLimit);
	240
	241	while (it.next()) {
	242	// Ignore runs in the ante context
	243	if (it.limit <= allStart) continue;
	244
	245	// Try to instantiate transliterator from it.scriptCode to
	246	// our target or target/variant
	247	Transliterator* t = getTransliterator(it.scriptCode);
57a6839d	248
b75a7d8f A	249	if (t == NULL) {
	250	// We have no transliterator. Do nothing, but keep
	251	// pos.start up to date.
	252	pos.start = it.limit;
	253	continue;
	254	}
	255
	256	// If the run end is before the transliteration limit, do
	257	// a non-incremental transliteration. Otherwise do an
	258	// incremental one.
	259	UBool incremental = isIncremental && (it.limit >= allLimit);
57a6839d	260
b75a7d8f A	261	pos.start = uprv_max(allStart, it.start);
	262	pos.limit = uprv_min(allLimit, it.limit);
	263	int32_t limit = pos.limit;
	264	t->filteredTransliterate(text, pos, incremental);
	265	int32_t delta = pos.limit - limit;
	266	allLimit += delta;
	267	it.adjustLimit(delta);
	268
	269	// We're done if we enter the post context
	270	if (it.limit >= allLimit) break;
	271	}
	272
	273	// Restore limit. pos.start is fine where the last transliterator
	274	// left it, or at the end of the last run.
	275	pos.limit = allLimit;
	276	}
	277
	278	Transliterator* AnyTransliterator::getTransliterator(UScriptCode source) const {
	279
	280	if (source == targetScript \|\| source == USCRIPT_INVALID_CODE) {
	281	return NULL;
	282	}
	283
57a6839d A	284	Transliterator* t = NULL;
	285	{
	286	Mutex m(NULL);
	287	t = (Transliterator*) uhash_iget(cache, (int32_t) source);
	288	}
b75a7d8f A	289	if (t == NULL) {
b75a7d8f A	290	UErrorCode ec = U_ZERO_ERROR;
2ca993e8	291	UnicodeString sourceName(uscript_getShortName(source), -1, US_INV);
b75a7d8f A	292	UnicodeString id(sourceName);
b75a7d8f A	293	id.append(TARGET_SEP).append(target);
57a6839d	294
b75a7d8f A	295	t = Transliterator::createInstance(id, UTRANS_FORWARD, ec);
	296	if (U_FAILURE(ec) \|\| t == NULL) {
	297	delete t;
57a6839d	298
b75a7d8f A	299	// Try to pivot around Latin, our most common script
b75a7d8f A	300	id = sourceName;
4388f060	301	id.append(LATIN_PIVOT, -1).append(target);
b75a7d8f A	302	t = Transliterator::createInstance(id, UTRANS_FORWARD, ec);
	303	if (U_FAILURE(ec) \|\| t == NULL) {
	304	delete t;
	305	t = NULL;
	306	}
	307	}
	308
	309	if (t != NULL) {
57a6839d A	310	Transliterator *rt = NULL;
	311	{
	312	Mutex m(NULL);
	313	rt = static_cast<Transliterator *> (uhash_iget(cache, (int32_t) source));
	314	if (rt == NULL) {
	315	// Common case, no race to cache this new transliterator.
	316	uhash_iput(cache, (int32_t) source, t, &ec);
	317	} else {
	318	// Race case, some other thread beat us to caching this transliterator.
	319	Transliterator *temp = rt;
	320	rt = t; // Our newly created transliterator that lost the race & now needs deleting.
	321	t = temp; // The transliterator from the cache that we will return.
	322	}
	323	}
	324	delete rt; // will be non-null only in case of races.
b75a7d8f A	325	}
b75a7d8f A	326	}
b75a7d8f A	327	return t;
	328	}
	329
	330	/**
	331	* Return the script code for a given name, or -1 if not found.
	332	*/
73c04bcf	333	static UScriptCode scriptNameToCode(const UnicodeString& name) {
b75a7d8f A	334	char buf[128];
	335	UScriptCode code;
	336	UErrorCode ec = U_ZERO_ERROR;
73c04bcf A	337	int32_t nameLen = name.length();
73c04bcf A	338	UBool isInvariant = uprv_isInvariantUString(name.getBuffer(), nameLen);
57a6839d	339
73c04bcf A	340	if (isInvariant) {
	341	name.extract(0, nameLen, buf, (int32_t)sizeof(buf), US_INV);
	342	buf[127] = 0; // Make sure that we NULL terminate the string.
	343	}
	344	if (!isInvariant \|\| uscript_getCode(buf, &code, 1, &ec) != 1 \|\| U_FAILURE(ec))
	345	{
b75a7d8f A	346	code = USCRIPT_INVALID_CODE;
	347	}
	348	return code;
	349	}
	350
	351	/**
	352	* Registers standard transliterators with the system. Called by
	353	* Transliterator during initialization. Scan all current targets and
	354	* register those that are scripts T as Any-T/V.
	355	*/
	356	void AnyTransliterator::registerIDs() {
	357
374ca955 A	358	UErrorCode ec = U_ZERO_ERROR;
374ca955 A	359	Hashtable seen(TRUE, ec);
b75a7d8f A	360
	361	int32_t sourceCount = Transliterator::_countAvailableSources();
	362	for (int32_t s=0; s<sourceCount; ++s) {
	363	UnicodeString source;
	364	Transliterator::_getAvailableSource(s, source);
	365
	366	// Ignore the "Any" source
4388f060	367	if (source.caseCompare(ANY, 3, 0 /U_FOLD_CASE_DEFAULT/) == 0) continue;
b75a7d8f A	368
	369	int32_t targetCount = Transliterator::_countAvailableTargets(source);
	370	for (int32_t t=0; t<targetCount; ++t) {
	371	UnicodeString target;
	372	Transliterator::_getAvailableTarget(t, source, target);
	373
	374	// Only process each target once
	375	if (seen.geti(target) != 0) continue;
	376	ec = U_ZERO_ERROR;
	377	seen.puti(target, 1, ec);
57a6839d	378
b75a7d8f A	379	// Get the script code for the target. If not a script, ignore.
	380	UScriptCode targetScript = scriptNameToCode(target);
	381	if (targetScript == USCRIPT_INVALID_CODE) continue;
	382
	383	int32_t variantCount = Transliterator::_countAvailableVariants(source, target);
	384	// assert(variantCount >= 1);
	385	for (int32_t v=0; v<variantCount; ++v) {
	386	UnicodeString variant;
	387	Transliterator::_getAvailableVariant(v, source, target, variant);
57a6839d	388
b75a7d8f	389	UnicodeString id;
4388f060	390	TransliteratorIDParser::STVtoID(UnicodeString(TRUE, ANY, 3), target, variant, id);
b75a7d8f A	391	ec = U_ZERO_ERROR;
	392	AnyTransliterator* t = new AnyTransliterator(id, target, variant,
	393	targetScript, ec);
	394	if (U_FAILURE(ec)) {
	395	delete t;
	396	} else {
	397	Transliterator::_registerInstance(t);
4388f060	398	Transliterator::_registerSpecialInverse(target, UnicodeString(TRUE, NULL_ID, 4), FALSE);
b75a7d8f A	399	}
	400	}
	401	}
	402	}
	403	}
	404
	405	U_NAMESPACE_END
	406
	407	#endif /* #if !UCONFIG_NO_TRANSLITERATION */
	408
	409	//eof