1002 lines
32 KiB
C++
1002 lines
32 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 08/10/2001 aliu Creation.
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**********************************************************************
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*/
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#include "transreg.h"
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#include "rbt_data.h"
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#include "rbt_pars.h"
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#include "unicode/cpdtrans.h"
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#include "unicode/nultrans.h"
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#include "unicode/parseerr.h"
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#include "unicode/rbt.h"
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#include "unicode/resbund.h"
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#include "unicode/translit.h"
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#include "unicode/uniset.h"
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#include "unicode/uscript.h"
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// UChar constants
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static const UChar LOCALE_SEP = 95; // '_'
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static const UChar ID_SEP = 0x002D; /*-*/
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static const UChar VARIANT_SEP = 0x002F; // '/'
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// String constants
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static const UChar NO_VARIANT[] = { 0 }; // empty string
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static const UChar ANY[] = { 65, 110, 121, 0 }; // Any
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/**
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* Resource bundle key for the RuleBasedTransliterator rule.
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*/
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static const char RB_RULE[] = "Rule";
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U_NAMESPACE_BEGIN
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//----------------------------------------------------------------------
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// class CharString
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//----------------------------------------------------------------------
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class CharString {
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public:
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CharString(const UnicodeString& str);
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~CharString();
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operator char*() { return ptr; }
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private:
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char buf[128];
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char* ptr;
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};
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CharString::CharString(const UnicodeString& str) {
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if (str.length() >= (int32_t)sizeof(buf)) {
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ptr = new char[str.length() + 8];
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} else {
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ptr = buf;
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}
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str.extract(0, 0x7FFFFFFF, ptr, "");
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}
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CharString::~CharString() {
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if (ptr != buf) {
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delete[] ptr;
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}
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}
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//------------------------------------------------------------------
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// Alias
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//------------------------------------------------------------------
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TransliteratorAlias::TransliteratorAlias(const UnicodeString& theAliasID) :
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ID(),
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aliasID(theAliasID),
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trans(0),
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idSplitPoint(-1) {
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}
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TransliteratorAlias::TransliteratorAlias(const UnicodeString& theID,
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const UnicodeString& idBlock,
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Transliterator* adopted,
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int32_t theIDSplitPoint,
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const UnicodeSet* cpdFilter) :
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ID(theID),
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aliasID(idBlock),
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trans(adopted),
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idSplitPoint(theIDSplitPoint),
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compoundFilter(cpdFilter) {
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}
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TransliteratorAlias::~TransliteratorAlias() {
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delete trans;
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}
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Transliterator* TransliteratorAlias::create(UParseError& pe,
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UErrorCode& ec) {
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Transliterator *t;
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if (trans == 0) {
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t = Transliterator::createInstance(aliasID, UTRANS_FORWARD, pe, ec);
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} else {
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t = new CompoundTransliterator(ID, aliasID, idSplitPoint,
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trans, pe, ec);
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trans = 0; // so we don't delete it later
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if (compoundFilter) {
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t->adoptFilter((UnicodeSet*) compoundFilter->clone());
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}
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}
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return t;
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}
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//----------------------------------------------------------------------
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// class Spec
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//----------------------------------------------------------------------
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/**
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* A Spec is a string specifying either a source or a target. In more
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* general terms, it may also specify a variant, but we only use the
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* Spec class for sources and targets.
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*
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* A Spec may be a locale or a script. If it is a locale, it has a
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* fallback chain that goes xx_YY_ZZZ -> xx_YY -> xx -> ssss, where
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* ssss is the script mapping of xx_YY_ZZZ. The Spec API methods
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* hasFallback(), next(), and reset() iterate over this fallback
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* sequence.
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*
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* The Spec class canonicalizes itself, so the locale is put into
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* canonical form, or the script is transformed from an abbreviation
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* to a full name.
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*/
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class Spec {
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public:
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Spec(const UnicodeString& spec);
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~Spec();
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const UnicodeString& get() const;
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UBool hasFallback() const;
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const UnicodeString& next();
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void reset();
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UBool isLocale() const;
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ResourceBundle& getBundle() const;
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operator const UnicodeString&() const { return get(); }
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const UnicodeString& getTop() const { return top; }
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private:
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void setupNext();
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UnicodeString top;
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UnicodeString spec;
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UnicodeString nextSpec;
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UnicodeString scriptName;
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UBool isSpecLocale; // TRUE if spec is a locale
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UBool isNextLocale; // TRUE if nextSpec is a locale
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ResourceBundle* res;
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};
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Spec::Spec(const UnicodeString& theSpec) : top(theSpec) {
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UErrorCode status = U_ZERO_ERROR;
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CharString topch(top);
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Locale toploc(topch);
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res = new ResourceBundle(u_getDataDirectory(), toploc, status);
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if (U_FAILURE(status) ||
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status == U_USING_DEFAULT_ERROR) {
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delete res;
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res = 0;
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}
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// Canonicalize script name -or- do locale->script mapping
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status = U_ZERO_ERROR;
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CharString spc(top);
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const int32_t capacity = 10;
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UScriptCode script[capacity]={USCRIPT_INVALID_CODE};
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int32_t num = uscript_getCode(spc,script,capacity, &status);
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// Canonicalize top
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char buf[256];
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if (res != 0) {
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// Canonicalize locale name
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status = U_ZERO_ERROR;
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uloc_getName(spc, buf, sizeof(buf), &status);
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if (U_SUCCESS(status) && status != U_STRING_NOT_TERMINATED_WARNING) {
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top = UnicodeString(buf, "");
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}
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} else if (scriptName.length() != 0) {
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// We are a script; use canonical name
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top = scriptName;
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}
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// assert(spec != top);
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reset();
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}
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Spec::~Spec() {
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delete res;
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}
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UBool Spec::hasFallback() const {
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return nextSpec.length() != 0;
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}
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void Spec::reset() {
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if (spec != top) {
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spec = top;
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isSpecLocale = (res != 0);
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setupNext();
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}
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}
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void Spec::setupNext() {
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isNextLocale = FALSE;
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if (isSpecLocale) {
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nextSpec = spec;
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int32_t i = nextSpec.lastIndexOf(LOCALE_SEP);
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// If i == 0 then we have _FOO, so we fall through
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// to the scriptName.
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if (i > 0) {
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nextSpec.truncate(i);
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isNextLocale = TRUE;
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} else {
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nextSpec = scriptName; // scriptName may be empty
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}
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} else {
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// spec is a script, so we are at the end
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nextSpec.truncate(0);
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}
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}
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// Protocol:
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// for(const UnicodeString& s(spec.get());
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// spec.hasFallback(); s(spec.next())) { ...
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const UnicodeString& Spec::next() {
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spec = nextSpec;
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isSpecLocale = isNextLocale;
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setupNext();
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return spec;
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}
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const UnicodeString& Spec::get() const {
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return spec;
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}
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UBool Spec::isLocale() const {
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return isSpecLocale;
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}
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ResourceBundle& Spec::getBundle() const {
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return *res;
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}
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//----------------------------------------------------------------------
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// class Entry
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//----------------------------------------------------------------------
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/**
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* The Entry object stores objects of different types and
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* singleton objects as placeholders for rule-based transliterators to
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* be built as needed. Instances of this struct can be placeholders,
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* can represent prototype transliterators to be cloned, or can
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* represent TransliteratorData objects. We don't support storing
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* classes in the registry because we don't have the rtti infrastructure
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* for it. We could easily add this if there is a need for it in the
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* future.
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*/
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class Entry {
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public:
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enum Type {
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RULES_FORWARD,
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RULES_REVERSE,
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LOCALE_RULES,
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PROTOTYPE,
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RBT_DATA,
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COMPOUND_RBT,
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ALIAS,
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FACTORY,
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NONE // Only used for uninitialized entries
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} entryType;
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// NOTE: stringArg cannot go inside the union because
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// it has a copy constructor
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UnicodeString stringArg; // For RULES_*, ALIAS, COMPOUND_RBT
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int32_t intArg; // For COMPOUND_RBT
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UnicodeSet* compoundFilter; // For COMPOUND_RBT
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union {
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Transliterator* prototype; // For PROTOTYPE
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TransliterationRuleData* data; // For RBT_DATA, COMPOUND_RBT
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struct {
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Transliterator::Factory function;
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Transliterator::Token context;
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} factory; // For FACTORY
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} u;
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Entry();
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~Entry();
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void adoptPrototype(Transliterator* adopted);
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void setFactory(Transliterator::Factory factory,
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Transliterator::Token context);
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};
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Entry::Entry() {
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u.prototype = 0;
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compoundFilter = NULL;
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entryType = NONE;
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}
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Entry::~Entry() {
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if (entryType == PROTOTYPE) {
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delete u.prototype;
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} else if (entryType == RBT_DATA) {
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// The data object is shared between instances of RBT. The
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// entry object owns it. It should only be deleted when the
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// transliterator component is being cleaned up. Doing so
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// invalidates any RBTs that the user has instantiated.
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delete u.data;
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}
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delete compoundFilter;
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}
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void Entry::adoptPrototype(Transliterator* adopted) {
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if (entryType == PROTOTYPE) {
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delete u.prototype;
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}
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entryType = PROTOTYPE;
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u.prototype = adopted;
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}
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void Entry::setFactory(Transliterator::Factory factory,
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Transliterator::Token context) {
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if (entryType == PROTOTYPE) {
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delete u.prototype;
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}
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entryType = FACTORY;
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u.factory.function = factory;
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u.factory.context = context;
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}
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// UObjectDeleter for Hashtable::setValueDeleter
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U_CDECL_BEGIN
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static void U_CALLCONV
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deleteEntry(void* obj) {
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delete (Entry*) obj;
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}
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U_CDECL_END
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//----------------------------------------------------------------------
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// class TransliteratorRegistry: Basic public API
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//----------------------------------------------------------------------
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TransliteratorRegistry::TransliteratorRegistry(UErrorCode& status) :
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registry(TRUE),
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specDAG(TRUE),
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availableIDs(status)
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{
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registry.setValueDeleter(deleteEntry);
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availableIDs.setDeleter(uhash_deleteUnicodeString);
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availableIDs.setComparer(uhash_compareCaselessUnicodeString);
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specDAG.setValueDeleter(uhash_deleteHashtable);
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}
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TransliteratorRegistry::~TransliteratorRegistry() {
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// Through the magic of C++, everything cleans itself up
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}
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Transliterator* TransliteratorRegistry::get(const UnicodeString& ID,
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TransliteratorAlias*& aliasReturn,
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UParseError& parseError,
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UErrorCode& status) {
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Entry *entry = find(ID);
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return (entry == 0) ? 0
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: instantiateEntry(ID, entry, aliasReturn, parseError,status);
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}
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void TransliteratorRegistry::put(Transliterator* adoptedProto,
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UBool visible) {
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Entry *entry = new Entry();
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entry->adoptPrototype(adoptedProto);
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registerEntry(adoptedProto->getID(), entry, visible);
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}
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void TransliteratorRegistry::put(const UnicodeString& ID,
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Transliterator::Factory factory,
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Transliterator::Token context,
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UBool visible) {
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Entry *entry = new Entry();
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entry->setFactory(factory, context);
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registerEntry(ID, entry, visible);
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}
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void TransliteratorRegistry::put(const UnicodeString& ID,
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const UnicodeString& resourceName,
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UTransDirection dir,
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UBool visible) {
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Entry *entry = new Entry();
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entry->entryType = (dir == UTRANS_FORWARD) ? Entry::RULES_FORWARD
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: Entry::RULES_REVERSE;
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entry->stringArg = resourceName;
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registerEntry(ID, entry, visible);
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}
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void TransliteratorRegistry::put(const UnicodeString& ID,
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const UnicodeString& alias,
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UBool visible) {
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Entry *entry = new Entry();
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entry->entryType = Entry::ALIAS;
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entry->stringArg = alias;
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registerEntry(ID, entry, visible);
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}
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void TransliteratorRegistry::remove(const UnicodeString& ID) {
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UnicodeString source, target, variant;
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IDtoSTV(ID, source, target, variant);
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// Only need to do this if ID.indexOf('-') < 0
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UnicodeString id;
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STVtoID(source, target, variant, id);
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registry.remove(id);
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removeSTV(source, target, variant);
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availableIDs.removeElement((void*) &id);
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}
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//----------------------------------------------------------------------
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// class TransliteratorRegistry: Public ID and spec management
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//----------------------------------------------------------------------
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/**
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* Return the number of IDs currently registered with the system.
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* To retrieve the actual IDs, call getAvailableID(i) with
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* i from 0 to countAvailableIDs() - 1.
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*/
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int32_t TransliteratorRegistry::countAvailableIDs(void) {
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return availableIDs.size();
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}
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/**
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* Return the index-th available ID. index must be between 0
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* and countAvailableIDs() - 1, inclusive. If index is out of
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* range, the result of getAvailableID(0) is returned.
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*/
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const UnicodeString& TransliteratorRegistry::getAvailableID(int32_t index) {
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if (index < 0 || index >= availableIDs.size()) {
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index = 0;
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}
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return *(const UnicodeString*) availableIDs[index];
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}
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int32_t TransliteratorRegistry::countAvailableSources(void) {
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return specDAG.count();
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}
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UnicodeString& TransliteratorRegistry::getAvailableSource(int32_t index,
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UnicodeString& result) {
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int32_t pos = -1;
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const UHashElement *e = 0;
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while (index-- >= 0) {
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e = specDAG.nextElement(pos);
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if (e == 0) {
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break;
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}
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}
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if (e == 0) {
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result.truncate(0);
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} else {
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result = *(UnicodeString*) e->key.pointer;
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}
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return result;
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}
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int32_t TransliteratorRegistry::countAvailableTargets(const UnicodeString& source) {
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Hashtable *targets = (Hashtable*) specDAG.get(source);
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return (targets == 0) ? 0 : targets->count();
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}
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UnicodeString& TransliteratorRegistry::getAvailableTarget(int32_t index,
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const UnicodeString& source,
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UnicodeString& result) {
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Hashtable *targets = (Hashtable*) specDAG.get(source);
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if (targets == 0) {
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result.truncate(0); // invalid source
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return result;
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}
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int32_t pos = -1;
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const UHashElement *e = 0;
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while (index-- >= 0) {
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e = targets->nextElement(pos);
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if (e == 0) {
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break;
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}
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}
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if (e == 0) {
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result.truncate(0); // invalid index
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} else {
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result = *(UnicodeString*) e->key.pointer;
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}
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return result;
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}
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int32_t TransliteratorRegistry::countAvailableVariants(const UnicodeString& source,
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const UnicodeString& target) {
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Hashtable *targets = (Hashtable*) specDAG.get(source);
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if (targets == 0) {
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return 0;
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}
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UVector *variants = (UVector*) targets->get(target);
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// variants may be 0 if the source/target are invalid
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return (variants == 0) ? 0 : variants->size();
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}
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UnicodeString& TransliteratorRegistry::getAvailableVariant(int32_t index,
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const UnicodeString& source,
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const UnicodeString& target,
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UnicodeString& result) {
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Hashtable *targets = (Hashtable*) specDAG.get(source);
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if (targets == 0) {
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result.truncate(0); // invalid source
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return result;
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}
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UVector *variants = (UVector*) targets->get(target);
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if (variants == 0) {
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result.truncate(0); // invalid target
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return result;
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}
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UnicodeString *v = (UnicodeString*) variants->elementAt(index);
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if (v == 0) {
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result.truncate(0); // invalid index
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} else {
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result = *v;
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}
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return result;
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}
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//----------------------------------------------------------------------
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// class TransliteratorRegistry: internal
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//----------------------------------------------------------------------
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/**
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* Given an ID, parse it into source, target, and variant strings.
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* The variant may be empty. If the source is empty it will be set to
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* "Any".
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*/
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void TransliteratorRegistry::IDtoSTV(const UnicodeString& id,
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UnicodeString& source,
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UnicodeString& target,
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UnicodeString& variant) {
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int32_t dash = id.indexOf(ID_SEP);
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int32_t stroke = id.indexOf(VARIANT_SEP);
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int32_t start = 0;
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int32_t limit = id.length();
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if (dash < 0) {
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source = ANY;
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} else {
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id.extractBetween(0, dash, source);
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start = dash + 1;
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}
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if (stroke >= 0) {
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id.extractBetween(stroke + 1, id.length(), variant);
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limit = stroke;
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}
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id.extractBetween(start, limit, target);
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}
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/**
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* Given source, target, and variant strings, concatenate them into a
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* full ID. If the source is empty, then "Any" will be used for the
|
|
* source, so the ID will always be of the form s-t/v or s-t.
|
|
*/
|
|
void TransliteratorRegistry::STVtoID(const UnicodeString& source,
|
|
const UnicodeString& target,
|
|
const UnicodeString& variant,
|
|
UnicodeString& id) {
|
|
id = source;
|
|
if (id.length() == 0) {
|
|
id = ANY;
|
|
}
|
|
id.append(ID_SEP).append(target);
|
|
if (variant.length() != 0) {
|
|
id.append(VARIANT_SEP).append(variant);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Convenience method. Calls 6-arg registerEntry().
|
|
*/
|
|
void TransliteratorRegistry::registerEntry(const UnicodeString& source,
|
|
const UnicodeString& target,
|
|
const UnicodeString& variant,
|
|
Entry* adopted,
|
|
UBool visible) {
|
|
UnicodeString ID;
|
|
UnicodeString s(source);
|
|
if (s.length() == 0) {
|
|
s = "Any";
|
|
}
|
|
STVtoID(source, target, variant, ID);
|
|
registerEntry(ID, s, target, variant, adopted, visible);
|
|
}
|
|
|
|
/**
|
|
* Convenience method. Calls 6-arg registerEntry().
|
|
*/
|
|
void TransliteratorRegistry::registerEntry(const UnicodeString& ID,
|
|
Entry* adopted,
|
|
UBool visible) {
|
|
UnicodeString source, target, variant;
|
|
IDtoSTV(ID, source, target, variant);
|
|
// Only need to do this if ID.indexOf('-') < 0
|
|
UnicodeString id;
|
|
STVtoID(source, target, variant, id);
|
|
registerEntry(id, source, target, variant, adopted, visible);
|
|
}
|
|
|
|
/**
|
|
* Register an entry object (adopted) with the given ID, source,
|
|
* target, and variant strings.
|
|
*/
|
|
void TransliteratorRegistry::registerEntry(const UnicodeString& ID,
|
|
const UnicodeString& source,
|
|
const UnicodeString& target,
|
|
const UnicodeString& variant,
|
|
Entry* adopted,
|
|
UBool visible) {
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
registry.put(ID, adopted, status);
|
|
if (visible) {
|
|
registerSTV(source, target, variant);
|
|
if (!availableIDs.contains((void*) &ID)) {
|
|
availableIDs.addElement(new UnicodeString(ID), status);
|
|
}
|
|
} else {
|
|
removeSTV(source, target, variant);
|
|
availableIDs.removeElement((void*) &ID);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Register a source-target/variant in the specDAG. Variant may be
|
|
* empty, but source and target must not be. If variant is empty then
|
|
* the special variant NO_VARIANT is stored in slot zero of the
|
|
* UVector of variants.
|
|
*/
|
|
void TransliteratorRegistry::registerSTV(const UnicodeString& source,
|
|
const UnicodeString& target,
|
|
const UnicodeString& variant) {
|
|
// assert(source.length() > 0);
|
|
// assert(target.length() > 0);
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
Hashtable *targets = (Hashtable*) specDAG.get(source);
|
|
if (targets == 0) {
|
|
targets = new Hashtable(TRUE);
|
|
if (targets == 0) {
|
|
return;
|
|
}
|
|
targets->setValueDeleter(uhash_deleteUVector);
|
|
specDAG.put(source, targets, status);
|
|
}
|
|
UVector *variants = (UVector*) targets->get(target);
|
|
if (variants == 0) {
|
|
variants = new UVector(uhash_deleteUnicodeString,
|
|
uhash_compareCaselessUnicodeString, status);
|
|
if (variants == 0) {
|
|
return;
|
|
}
|
|
targets->put(target, variants, status);
|
|
}
|
|
// assert(NO_VARIANT == "");
|
|
// We add the variant string. If it is the special "no variant"
|
|
// string, that is, the empty string, we add it at position zero.
|
|
if (!variants->contains((void*) &variant)) {
|
|
if (variant.length() > 0) {
|
|
variants->addElement(new UnicodeString(variant), status);
|
|
} else {
|
|
variants->insertElementAt(new UnicodeString(NO_VARIANT), 0, status);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Remove a source-target/variant from the specDAG.
|
|
*/
|
|
void TransliteratorRegistry::removeSTV(const UnicodeString& source,
|
|
const UnicodeString& target,
|
|
const UnicodeString& variant) {
|
|
// assert(source.length() > 0);
|
|
// assert(target.length() > 0);
|
|
// UErrorCode status = U_ZERO_ERROR;
|
|
Hashtable *targets = (Hashtable*) specDAG.get(source);
|
|
if (targets == 0) {
|
|
return; // should never happen for valid s-t/v
|
|
}
|
|
UVector *variants = (UVector*) targets->get(target);
|
|
if (variants == 0) {
|
|
return; // should never happen for valid s-t/v
|
|
}
|
|
variants->removeElement((void*) &variant);
|
|
if (variants->size() == 0) {
|
|
targets->remove(target); // should delete variants
|
|
if (targets->count() == 0) {
|
|
specDAG.remove(source); // should delete targets
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Attempt to find a source-target/variant in the dynamic registry
|
|
* store. Return 0 on failure.
|
|
*
|
|
* Caller does NOT own returned object.
|
|
*/
|
|
Entry* TransliteratorRegistry::findInDynamicStore(const Spec& src,
|
|
const Spec& trg,
|
|
const UnicodeString& variant) {
|
|
UnicodeString ID;
|
|
STVtoID(src, trg, variant, ID);
|
|
return (Entry*) registry.get(ID);
|
|
}
|
|
|
|
/**
|
|
* Attempt to find a source-target/variant in the static locale
|
|
* resource store. Do not perform fallback. Return 0 on failure.
|
|
*
|
|
* On success, create a new entry object, register it in the dynamic
|
|
* store, and return a pointer to it, but do not make it public --
|
|
* just because someone requested something, we do not expand the
|
|
* available ID list (or spec DAG).
|
|
*
|
|
* Caller does NOT own returned object.
|
|
*/
|
|
Entry* TransliteratorRegistry::findInStaticStore(const Spec& src,
|
|
const Spec& trg,
|
|
const UnicodeString& variant) {
|
|
Entry* entry = 0;
|
|
if (src.isLocale()) {
|
|
entry = findInBundle(src, trg, variant,
|
|
"TransliterateTo");
|
|
} else if (trg.isLocale()) {
|
|
entry = findInBundle(trg, src, variant,
|
|
"TransliterateFrom");
|
|
}
|
|
|
|
// If we found an entry, store it in the Hashtable for next
|
|
// time.
|
|
if (entry != 0) {
|
|
registerEntry(src.getTop(), trg.getTop(), variant, entry, FALSE);
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
|
|
/**
|
|
* Attempt to find an entry in a single resource bundle. This is
|
|
* a one-sided lookup. findInStaticStore() performs up to two such
|
|
* lookups, one for the source, and one for the target.
|
|
*
|
|
* Do not perform fallback. Return 0 on failure.
|
|
*
|
|
* On success, create a new Entry object, populate it, and return it.
|
|
* The caller owns the returned object.
|
|
*/
|
|
Entry* TransliteratorRegistry::findInBundle(const Spec& specToOpen,
|
|
const Spec& specToFind,
|
|
const UnicodeString& variant,
|
|
const char* tagPrefix) {
|
|
|
|
UnicodeString utag(tagPrefix);
|
|
utag.append(LOCALE_SEP).append(specToFind.get());
|
|
CharString tag(utag);
|
|
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
ResourceBundle subres(specToOpen.getBundle().get(tag, status));
|
|
if (U_FAILURE(status) ||
|
|
status == U_USING_DEFAULT_ERROR) {
|
|
return 0;
|
|
}
|
|
|
|
if (specToOpen.get() != subres.getLocale().getName()) {
|
|
return 0;
|
|
}
|
|
|
|
UnicodeString resStr;
|
|
if (variant.length() != 0) {
|
|
CharString var(variant);
|
|
status = U_ZERO_ERROR;
|
|
UnicodeString resStr = subres.getStringEx(var, status);
|
|
if (U_FAILURE(status)) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
else {
|
|
// Variant is empty, which means match the first variant listed.
|
|
status = U_ZERO_ERROR;
|
|
ResourceBundle subsub(subres.getNext(status));
|
|
if (U_FAILURE(status)) {
|
|
return 0;
|
|
}
|
|
resStr = subsub.getNextString(status);
|
|
if (U_FAILURE(status)) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// We have succeeded in loading a string from the locale
|
|
// resources. Create a new registry entry to hold it and return it.
|
|
Entry *entry = new Entry();
|
|
if (entry != 0) {
|
|
entry->entryType = Entry::LOCALE_RULES;
|
|
entry->stringArg = resStr;
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
|
|
/**
|
|
* Convenience method. Calls 3-arg find().
|
|
*/
|
|
Entry* TransliteratorRegistry::find(const UnicodeString& ID) {
|
|
UnicodeString source, target, variant;
|
|
IDtoSTV(ID, source, target, variant);
|
|
return find(source, target, variant);
|
|
}
|
|
|
|
/**
|
|
* Top-level find method. Attempt to find a source-target/variant in
|
|
* either the dynamic or the static (locale resource) store. Perform
|
|
* fallback.
|
|
*
|
|
* Lookup sequence for ss_SS_SSS-tt_TT_TTT/v:
|
|
*
|
|
* ss_SS_SSS-tt_TT_TTT/v -- in hashtable
|
|
* ss_SS_SSS-tt_TT_TTT/v -- in ss_SS_SSS (no fallback)
|
|
*
|
|
* repeat with t = tt_TT_TTT, tt_TT, tt, and tscript
|
|
*
|
|
* ss_SS_SSS-t/ *
|
|
* ss_SS-t/ *
|
|
* ss-t/ *
|
|
* sscript-t/ *
|
|
*
|
|
* Here * matches the first variant listed.
|
|
*
|
|
* Caller does NOT own returned object. Return 0 on failure.
|
|
*/
|
|
Entry* TransliteratorRegistry::find(UnicodeString& source,
|
|
UnicodeString& target,
|
|
UnicodeString& variant) {
|
|
|
|
Spec src(source);
|
|
Spec trg(target);
|
|
Entry* entry;
|
|
|
|
if (variant.length() != 0) {
|
|
|
|
// Seek exact match in hashtable
|
|
entry = findInDynamicStore(src, trg, variant);
|
|
if (entry != 0) {
|
|
return entry;
|
|
}
|
|
|
|
// Seek exact match in locale resources
|
|
entry = findInStaticStore(src, trg, variant);
|
|
if (entry != 0) {
|
|
return entry;
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
src.reset();
|
|
for (;;) {
|
|
// Seek match in hashtable
|
|
entry = findInDynamicStore(src, trg, NO_VARIANT);
|
|
if (entry != 0) {
|
|
return entry;
|
|
}
|
|
|
|
// Seek match in locale resources
|
|
entry = findInStaticStore(src, trg, NO_VARIANT);
|
|
if (entry != 0) {
|
|
return entry;
|
|
}
|
|
if (!src.hasFallback()) {
|
|
break;
|
|
}
|
|
src.next();
|
|
}
|
|
if (!trg.hasFallback()) {
|
|
break;
|
|
}
|
|
trg.next();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Given an Entry object, instantiate it. Caller owns result. Return
|
|
* 0 on failure.
|
|
*
|
|
* Return a non-empty aliasReturn value if the ID points to an alias.
|
|
* We cannot instantiate it ourselves because the alias may contain
|
|
* filters or compounds, which we do not understand. Caller should
|
|
* make aliasReturn empty before calling.
|
|
*
|
|
* The entry object is assumed to reside in the dynamic store. It may be
|
|
* modified.
|
|
*/
|
|
Transliterator* TransliteratorRegistry::instantiateEntry(const UnicodeString& ID,
|
|
Entry *entry,
|
|
TransliteratorAlias* &aliasReturn,
|
|
UParseError& parseError,
|
|
UErrorCode& status) {
|
|
|
|
for (;;) {
|
|
if (entry->entryType == Entry::RBT_DATA) {
|
|
return new RuleBasedTransliterator(ID, entry->u.data);
|
|
} else if (entry->entryType == Entry::PROTOTYPE) {
|
|
return entry->u.prototype->clone();
|
|
} else if (entry->entryType == Entry::ALIAS) {
|
|
aliasReturn = new TransliteratorAlias(entry->stringArg);
|
|
return 0;
|
|
} else if (entry->entryType == Entry::FACTORY) {
|
|
return entry->u.factory.function(ID, entry->u.factory.context);
|
|
} else if (entry->entryType == Entry::COMPOUND_RBT) {
|
|
UnicodeString id("_", "");
|
|
Transliterator *t = new RuleBasedTransliterator(id, entry->u.data);
|
|
aliasReturn = new TransliteratorAlias(ID, entry->stringArg, t, entry->intArg, entry->compoundFilter);
|
|
return 0;
|
|
}
|
|
|
|
// At this point entry type must be either RULES_FORWARD or
|
|
// RULES_REVERSE. We process the rule data into a
|
|
// TransliteratorRuleData object, and possibly also into an
|
|
// ::id header and/or footer. Then we modify the registry with
|
|
// the parsed data and retry.
|
|
UBool isReverse = (entry->entryType == Entry::RULES_REVERSE);
|
|
|
|
// We use the file name, taken from another resource bundle
|
|
// 2-d array at static init time, as a locale language. We're
|
|
// just using the locale mechanism to map through to a file
|
|
// name; this in no way represents an actual locale.
|
|
CharString ch(entry->stringArg);
|
|
UResourceBundle *bundle = ures_openDirect(0, ch, &status);
|
|
UnicodeString rules = ures_getUnicodeStringByKey(bundle, RB_RULE, &status);
|
|
ures_close(bundle);
|
|
|
|
// If the status indicates a failure, then we don't have any
|
|
// rules -- there is probably an installation error. The list
|
|
// in the root locale should correspond to all the installed
|
|
// transliterators; if it lists something that's not
|
|
// installed, we'll get an error from ResourceBundle.
|
|
|
|
TransliteratorParser parser;
|
|
parser.parse(rules, isReverse ? UTRANS_REVERSE : UTRANS_FORWARD,
|
|
parseError, status);
|
|
|
|
if (U_FAILURE(status)) {
|
|
// We have a failure of some kind. Remove the ID from the
|
|
// registry so we don't keep trying. NOTE: This will throw off
|
|
// anyone who is, at the moment, trying to iterate over the
|
|
// available IDs. That's acceptable since we should never
|
|
// really get here except under installation, configuration,
|
|
// or unrecoverable run time memory failures.
|
|
remove(ID);
|
|
break;
|
|
}
|
|
|
|
entry->u.data = parser.orphanData();
|
|
entry->stringArg = parser.idBlock;
|
|
entry->intArg = parser.idSplitPoint;
|
|
entry->compoundFilter = parser.orphanCompoundFilter();
|
|
|
|
// Reset entry->entryType to something that we process at the
|
|
// top of the loop, then loop back to the top. As long as we
|
|
// do this, we only loop through twice at most.
|
|
// NOTE: The logic here matches that in
|
|
// Transliterator::createFromRules().
|
|
if (entry->stringArg.length() == 0) {
|
|
if (entry->u.data == 0) {
|
|
// No idBlock, no data -- this is just an
|
|
// alias for Null
|
|
entry->entryType = Entry::ALIAS;
|
|
entry->stringArg = NullTransliterator::ID;
|
|
} else {
|
|
// No idBlock, data != 0 -- this is an
|
|
// ordinary RBT_DATA
|
|
entry->entryType = Entry::RBT_DATA;
|
|
}
|
|
} else {
|
|
if (entry->u.data == 0) {
|
|
// idBlock, no data -- this is an alias
|
|
entry->entryType = Entry::ALIAS;
|
|
} else {
|
|
// idBlock and data -- this is a compound
|
|
// RBT
|
|
entry->entryType = Entry::COMPOUND_RBT;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0; // failed
|
|
}
|
|
U_NAMESPACE_END
|
|
|
|
//eof
|