// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ********************************************************************** * Copyright (C) 2001-2011, International Business Machines * Corporation and others. All Rights Reserved. ********************************************************************** * Date Name Description * 05/24/01 aliu Creation. ********************************************************************** */ #include "unicode/utypes.h" #if !UCONFIG_NO_TRANSLITERATION #include "unicode/uchar.h" #include "unicode/uniset.h" #include "unicode/ustring.h" #include "unicode/utf16.h" #include "titletrn.h" #include "umutex.h" #include "ucase.h" #include "cpputils.h" U_NAMESPACE_BEGIN UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TitlecaseTransliterator) TitlecaseTransliterator::TitlecaseTransliterator() : CaseMapTransliterator(UNICODE_STRING("Any-Title", 9), nullptr) { // Need to look back 2 characters in the case of "can't" setMaximumContextLength(2); } /** * Destructor. */ TitlecaseTransliterator::~TitlecaseTransliterator() { } /** * Copy constructor. */ TitlecaseTransliterator::TitlecaseTransliterator(const TitlecaseTransliterator& o) : CaseMapTransliterator(o) { } /** * Assignment operator. */ /*TitlecaseTransliterator& TitlecaseTransliterator::operator=( const TitlecaseTransliterator& o) { CaseMapTransliterator::operator=(o); return *this; }*/ /** * Transliterator API. */ TitlecaseTransliterator* TitlecaseTransliterator::clone() const { return new TitlecaseTransliterator(*this); } /** * Implements {@link Transliterator#handleTransliterate}. */ void TitlecaseTransliterator::handleTransliterate( Replaceable& text, UTransPosition& offsets, UBool isIncremental) const { // TODO reimplement, see ustrcase.c // using a real word break iterator // instead of just looking for a transition between cased and uncased characters // call CaseMapTransliterator::handleTransliterate() for lowercasing? (set fMap) // needs to take isIncremental into account because case mappings are context-sensitive // also detect when lowercasing function did not finish because of context if (offsets.start >= offsets.limit) { return; } // case type: >0 cased (UCASE_LOWER etc.) ==0 uncased <0 case-ignorable int32_t type; // Our mode; we are either converting letter toTitle or // toLower. UBool doTitle = true; // Determine if there is a preceding context of cased case-ignorable*, // in which case we want to start in toLower mode. If the // prior context is anything else (including empty) then start // in toTitle mode. UChar32 c; int32_t start; for (start = offsets.start - 1; start >= offsets.contextStart; start -= U16_LENGTH(c)) { c = text.char32At(start); type=ucase_getTypeOrIgnorable(c); if(type>0) { // cased doTitle=false; break; } else if(type==0) { // uncased but not ignorable break; } // else (type<0) case-ignorable: continue } // Convert things after a cased character toLower; things // after an uncased, non-case-ignorable character toTitle. Case-ignorable // characters are copied directly and do not change the mode. UCaseContext csc; uprv_memset(&csc, 0, sizeof(csc)); csc.p = &text; csc.start = offsets.contextStart; csc.limit = offsets.contextLimit; UnicodeString tmp; const char16_t *s; int32_t textPos, delta, result; for(textPos=offsets.start; textPos<offsets.limit;) { csc.cpStart=textPos; c=text.char32At(textPos); csc.cpLimit=textPos+=U16_LENGTH(c); type=ucase_getTypeOrIgnorable(c); if(type>=0) { // not case-ignorable if(doTitle) { result=ucase_toFullTitle(c, utrans_rep_caseContextIterator, &csc, &s, UCASE_LOC_ROOT); } else { result=ucase_toFullLower(c, utrans_rep_caseContextIterator, &csc, &s, UCASE_LOC_ROOT); } doTitle = static_cast<UBool>(type == 0); // doTitle=isUncased if(csc.b1 && isIncremental) { // fMap() tried to look beyond the context limit // wait for more input offsets.start=csc.cpStart; return; } if(result>=0) { // replace the current code point with its full case mapping result // see UCASE_MAX_STRING_LENGTH if(result<=UCASE_MAX_STRING_LENGTH) { // string s[result] tmp.setTo(false, s, result); delta=result-U16_LENGTH(c); } else { // single code point tmp.setTo(result); delta=tmp.length()-U16_LENGTH(c); } text.handleReplaceBetween(csc.cpStart, textPos, tmp); if(delta!=0) { textPos+=delta; csc.limit=offsets.contextLimit+=delta; offsets.limit+=delta; } } } } offsets.start=textPos; } U_NAMESPACE_END #endif /* #if !UCONFIG_NO_TRANSLITERATION */