136 lines
3.7 KiB
C++
136 lines
3.7 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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* 05/24/01 aliu Creation.
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**********************************************************************
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*/
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#include "unicode/uchar.h"
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#include "titletrn.h"
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#include "unicode/uniset.h"
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#include "mutex.h"
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#include "ucln_in.h"
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U_NAMESPACE_BEGIN
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/**
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* ID for this transliterator.
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*/
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const char TitlecaseTransliterator::_ID[] = "Any-Title";
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/**
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* The set of characters we skip. These are neither cased nor
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* non-cased, to us; we copy them verbatim.
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*/
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static UnicodeSet* SKIP = NULL;
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/**
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* The set of characters that cause the next non-SKIP character
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* to be lowercased.
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*/
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static UnicodeSet* CASED = NULL;
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TitlecaseTransliterator::TitlecaseTransliterator(UnicodeFilter* adoptedFilter) :
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Transliterator(_ID, adoptedFilter) {
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// Need to look back 2 characters in the case of "can't"
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setMaximumContextLength(2);
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}
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/**
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* Destructor.
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*/
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TitlecaseTransliterator::~TitlecaseTransliterator() {}
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/**
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* Copy constructor.
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*/
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TitlecaseTransliterator::TitlecaseTransliterator(const TitlecaseTransliterator& o) :
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Transliterator(o) {}
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/**
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* Assignment operator.
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*/
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TitlecaseTransliterator& TitlecaseTransliterator::operator=(
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const TitlecaseTransliterator& o) {
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Transliterator::operator=(o);
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return *this;
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}
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/**
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* Transliterator API.
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*/
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Transliterator* TitlecaseTransliterator::clone(void) const {
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return new TitlecaseTransliterator(*this);
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}
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/**
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* Implements {@link Transliterator#handleTransliterate}.
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*/
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void TitlecaseTransliterator::handleTransliterate(
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Replaceable& text, UTransPosition& offsets,
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UBool isIncremental) const {
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if (SKIP == NULL) {
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Mutex lock;
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if (SKIP == NULL) {
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UErrorCode ec = U_ZERO_ERROR;
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SKIP = new UnicodeSet(UnicodeString("[\\u00AD \\u2019 \\' [:Mn:] [:Me:] [:Cf:] [:Lm:]]", ""), ec);
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CASED = new UnicodeSet(UnicodeString("[[:Lu:] [:Ll:] [:Lt:]]", ""), ec);
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ucln_i18n_registerCleanup();
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}
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}
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// Our mode; we are either converting letter toTitle or
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// toLower.
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UBool doTitle = TRUE;
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// Determine if there is a preceding context of CASED SKIP*,
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// in which case we want to start in toLower mode. If the
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// prior context is anything else (including empty) then start
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// in toTitle mode.
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int32_t start = offsets.start;
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while (start > offsets.contextStart) {
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UChar c = text.charAt(--start);
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if (SKIP->contains(c)) {
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continue;
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}
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doTitle = !CASED->contains(c);
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break;
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}
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// Convert things after a CASED character toLower; things
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// after a non-CASED, non-SKIP character toTitle. SKIP
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// characters are copied directly and do not change the mode.
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UnicodeString str("A", "");
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for (start=offsets.start; start<offsets.limit; ++start) {
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UChar c = text.charAt(start);
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if (SKIP->contains(c)) {
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continue;
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}
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UChar d = (UChar) (doTitle ? u_totitle(c)
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: u_tolower(c));
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if (c != d) {
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str.setCharAt(0, d);
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text.handleReplaceBetween(start, start+1, str);
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}
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doTitle = !CASED->contains(c);
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}
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offsets.start = start;
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}
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/**
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* Static memory cleanup function.
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*/
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void TitlecaseTransliterator::cleanup() {
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if (SKIP != NULL) {
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delete SKIP; SKIP = NULL;
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delete CASED; CASED = NULL;
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}
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}
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U_NAMESPACE_END
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