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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /intl/icu/source/i18n/nortrans.cpp
parentInitial commit. (diff)
downloadfirefox-esr-upstream.tar.xz
firefox-esr-upstream.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--intl/icu/source/i18n/nortrans.cpp178
1 files changed, 178 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/nortrans.cpp b/intl/icu/source/i18n/nortrans.cpp
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+// © 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
+* 07/03/01 aliu Creation.
+**********************************************************************
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_TRANSLITERATION
+
+#include "unicode/normalizer2.h"
+#include "unicode/utf16.h"
+#include "cstring.h"
+#include "nortrans.h"
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(NormalizationTransliterator)
+
+static inline Transliterator::Token cstrToken(const char *s) {
+ return Transliterator::pointerToken((void *)s);
+}
+
+/**
+ * System registration hook.
+ */
+void NormalizationTransliterator::registerIDs() {
+ // In the Token, the byte after the NUL is the UNormalization2Mode.
+ Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-NFC"),
+ _create, cstrToken("nfc\0\0"));
+ Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-NFKC"),
+ _create, cstrToken("nfkc\0\0"));
+ Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-NFD"),
+ _create, cstrToken("nfc\0\1"));
+ Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-NFKD"),
+ _create, cstrToken("nfkc\0\1"));
+ Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-FCD"),
+ _create, cstrToken("nfc\0\2"));
+ Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-FCC"),
+ _create, cstrToken("nfc\0\3"));
+ Transliterator::_registerSpecialInverse(UNICODE_STRING_SIMPLE("NFC"),
+ UNICODE_STRING_SIMPLE("NFD"), true);
+ Transliterator::_registerSpecialInverse(UNICODE_STRING_SIMPLE("NFKC"),
+ UNICODE_STRING_SIMPLE("NFKD"), true);
+ Transliterator::_registerSpecialInverse(UNICODE_STRING_SIMPLE("FCC"),
+ UNICODE_STRING_SIMPLE("NFD"), false);
+ Transliterator::_registerSpecialInverse(UNICODE_STRING_SIMPLE("FCD"),
+ UNICODE_STRING_SIMPLE("FCD"), false);
+}
+
+/**
+ * Factory methods
+ */
+Transliterator* NormalizationTransliterator::_create(const UnicodeString& ID,
+ Token context) {
+ const char *name = (const char *)context.pointer;
+ UNormalization2Mode mode = (UNormalization2Mode)uprv_strchr(name, 0)[1];
+ UErrorCode errorCode = U_ZERO_ERROR;
+ const Normalizer2 *norm2 = Normalizer2::getInstance(nullptr, name, mode, errorCode);
+ if(U_SUCCESS(errorCode)) {
+ return new NormalizationTransliterator(ID, *norm2);
+ } else {
+ return nullptr;
+ }
+}
+
+/**
+ * Constructs a transliterator.
+ */
+NormalizationTransliterator::NormalizationTransliterator(const UnicodeString& id,
+ const Normalizer2 &norm2) :
+ Transliterator(id, 0), fNorm2(norm2) {}
+
+/**
+ * Destructor.
+ */
+NormalizationTransliterator::~NormalizationTransliterator() {
+}
+
+/**
+ * Copy constructor.
+ */
+NormalizationTransliterator::NormalizationTransliterator(const NormalizationTransliterator& o) :
+ Transliterator(o), fNorm2(o.fNorm2) {}
+
+/**
+ * Transliterator API.
+ */
+NormalizationTransliterator* NormalizationTransliterator::clone() const {
+ return new NormalizationTransliterator(*this);
+}
+
+/**
+ * Implements {@link Transliterator#handleTransliterate}.
+ */
+void NormalizationTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
+ UBool isIncremental) const {
+ // start and limit of the input range
+ int32_t start = offsets.start;
+ int32_t limit = offsets.limit;
+ if(start >= limit) {
+ return;
+ }
+
+ /*
+ * Normalize as short chunks at a time as possible even in
+ * bulk mode, so that styled text is minimally disrupted.
+ * In incremental mode, a chunk that ends with offsets.limit
+ * must not be normalized.
+ *
+ * If it was known that the input text is not styled, then
+ * a bulk mode normalization could look like this:
+
+ UnicodeString input, normalized;
+ int32_t length = limit - start;
+ _Replaceable_extractBetween(text, start, limit, input.getBuffer(length));
+ input.releaseBuffer(length);
+
+ UErrorCode status = U_ZERO_ERROR;
+ fNorm2.normalize(input, normalized, status);
+
+ text.handleReplaceBetween(start, limit, normalized);
+
+ int32_t delta = normalized.length() - length;
+ offsets.contextLimit += delta;
+ offsets.limit += delta;
+ offsets.start = limit + delta;
+
+ */
+ UErrorCode errorCode = U_ZERO_ERROR;
+ UnicodeString segment;
+ UnicodeString normalized;
+ UChar32 c = text.char32At(start);
+ do {
+ int32_t prev = start;
+ // Skip at least one character so we make progress.
+ // c holds the character at start.
+ segment.remove();
+ do {
+ segment.append(c);
+ start += U16_LENGTH(c);
+ } while(start < limit && !fNorm2.hasBoundaryBefore(c = text.char32At(start)));
+ if(start == limit && isIncremental && !fNorm2.hasBoundaryAfter(c)) {
+ // stop in incremental mode when we reach the input limit
+ // in case there are additional characters that could change the
+ // normalization result
+ start=prev;
+ break;
+ }
+ fNorm2.normalize(segment, normalized, errorCode);
+ if(U_FAILURE(errorCode)) {
+ break;
+ }
+ if(segment != normalized) {
+ // replace the input chunk with its normalized form
+ text.handleReplaceBetween(prev, start, normalized);
+
+ // update all necessary indexes accordingly
+ int32_t delta = normalized.length() - (start - prev);
+ start += delta;
+ limit += delta;
+ }
+ } while(start < limit);
+
+ offsets.start = start;
+ offsets.contextLimit += limit - offsets.limit;
+ offsets.limit = limit;
+}
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_TRANSLITERATION */