initial commit, 4.5 stable

thirdparty/icu4c/common/ustr_titlecase_brkiter.cpp

@@ -0,0 +1,237 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*   Copyright (C) 2011, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*******************************************************************************
+*   file name:  ustr_titlecase_brkiter.cpp
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2011may30
+*   created by: Markus W. Scherer
+*
+*   Titlecasing functions that are based on BreakIterator
+*   were moved here to break dependency cycles among parts of the common library.
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_BREAK_ITERATION
+
+#include "unicode/brkiter.h"
+#include "unicode/casemap.h"
+#include "unicode/chariter.h"
+#include "unicode/localpointer.h"
+#include "unicode/ubrk.h"
+#include "unicode/ucasemap.h"
+#include "unicode/utext.h"
+#include "cmemory.h"
+#include "uassert.h"
+#include "ucase.h"
+#include "ucasemap_imp.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * Whole-string BreakIterator.
+ * Titlecasing only calls setText(), first(), and next().
+ * We implement the rest only to satisfy the abstract interface.
+ */
+class WholeStringBreakIterator : public BreakIterator {
+public:
+    WholeStringBreakIterator() : BreakIterator(), length(0) {}
+    ~WholeStringBreakIterator() override;
+    bool operator==(const BreakIterator&) const override;
+    WholeStringBreakIterator *clone() const override;
+    static UClassID U_EXPORT2 getStaticClassID();
+    UClassID getDynamicClassID() const override;
+    CharacterIterator &getText() const override;
+    UText *getUText(UText *fillIn, UErrorCode &errorCode) const override;
+    void  setText(const UnicodeString &text) override;
+    void  setText(UText *text, UErrorCode &errorCode) override;
+    void  adoptText(CharacterIterator* it) override;
+    int32_t first() override;
+    int32_t last() override;
+    int32_t previous() override;
+    int32_t next() override;
+    int32_t current() const override;
+    int32_t following(int32_t offset) override;
+    int32_t preceding(int32_t offset) override;
+    UBool isBoundary(int32_t offset) override;
+    int32_t next(int32_t n) override;
+    WholeStringBreakIterator *createBufferClone(void *stackBuffer, int32_t &BufferSize,
+                                                UErrorCode &errorCode) override;
+    WholeStringBreakIterator &refreshInputText(UText *input, UErrorCode &errorCode) override;
+
+private:
+    int32_t length;
+};
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(WholeStringBreakIterator)
+
+WholeStringBreakIterator::~WholeStringBreakIterator() {}
+bool WholeStringBreakIterator::operator==(const BreakIterator&) const { return false; }
+WholeStringBreakIterator *WholeStringBreakIterator::clone() const { return nullptr; }
+
+CharacterIterator &WholeStringBreakIterator::getText() const {
+    UPRV_UNREACHABLE_EXIT;  // really should not be called
+}
+UText *WholeStringBreakIterator::getUText(UText * /*fillIn*/, UErrorCode &errorCode) const {
+    if (U_SUCCESS(errorCode)) {
+        errorCode = U_UNSUPPORTED_ERROR;
+    }
+    return nullptr;
+}
+
+void  WholeStringBreakIterator::setText(const UnicodeString &text) {
+    length = text.length();
+}
+void  WholeStringBreakIterator::setText(UText *text, UErrorCode &errorCode) {
+    if (U_SUCCESS(errorCode)) {
+        int64_t length64 = utext_nativeLength(text);
+        if (length64 <= INT32_MAX) {
+            length = static_cast<int32_t>(length64);
+        } else {
+            errorCode = U_INDEX_OUTOFBOUNDS_ERROR;
+        }
+    }
+}
+void  WholeStringBreakIterator::adoptText(CharacterIterator*) {
+    UPRV_UNREACHABLE_EXIT;  // should not be called
+}
+
+int32_t WholeStringBreakIterator::first() { return 0; }
+int32_t WholeStringBreakIterator::last() { return length; }
+int32_t WholeStringBreakIterator::previous() { return 0; }
+int32_t WholeStringBreakIterator::next() { return length; }
+int32_t WholeStringBreakIterator::current() const { return 0; }
+int32_t WholeStringBreakIterator::following(int32_t /*offset*/) { return length; }
+int32_t WholeStringBreakIterator::preceding(int32_t /*offset*/) { return 0; }
+UBool WholeStringBreakIterator::isBoundary(int32_t /*offset*/) { return false; }
+int32_t WholeStringBreakIterator::next(int32_t /*n*/) { return length; }
+
+WholeStringBreakIterator *WholeStringBreakIterator::createBufferClone(
+        void * /*stackBuffer*/, int32_t & /*BufferSize*/, UErrorCode &errorCode) {
+    if (U_SUCCESS(errorCode)) {
+        errorCode = U_UNSUPPORTED_ERROR;
+    }
+    return nullptr;
+}
+WholeStringBreakIterator &WholeStringBreakIterator::refreshInputText(
+        UText * /*input*/, UErrorCode &errorCode) {
+    if (U_SUCCESS(errorCode)) {
+        errorCode = U_UNSUPPORTED_ERROR;
+    }
+    return *this;
+}
+
+U_CFUNC
+BreakIterator *ustrcase_getTitleBreakIterator(
+        const Locale *locale, const char *locID, uint32_t options, BreakIterator *iter,
+        LocalPointer<BreakIterator> &ownedIter, UErrorCode &errorCode) {
+    if (U_FAILURE(errorCode)) { return nullptr; }
+    options &= U_TITLECASE_ITERATOR_MASK;
+    if (options != 0 && iter != nullptr) {
+        errorCode = U_ILLEGAL_ARGUMENT_ERROR;
+        return nullptr;
+    }
+    if (iter == nullptr) {
+        switch (options) {
+        case 0:
+            iter = BreakIterator::createWordInstance(
+                locale != nullptr ? *locale : Locale(locID), errorCode);
+            break;
+        case U_TITLECASE_WHOLE_STRING:
+            iter = new WholeStringBreakIterator();
+            if (iter == nullptr) {
+                errorCode = U_MEMORY_ALLOCATION_ERROR;
+            }
+            break;
+        case U_TITLECASE_SENTENCES:
+            iter = BreakIterator::createSentenceInstance(
+                locale != nullptr ? *locale : Locale(locID), errorCode);
+            break;
+        default:
+            errorCode = U_ILLEGAL_ARGUMENT_ERROR;
+            break;
+        }
+        ownedIter.adoptInstead(iter);
+    }
+    return iter;
+}
+
+int32_t CaseMap::toTitle(
+        const char *locale, uint32_t options, BreakIterator *iter,
+        const char16_t *src, int32_t srcLength,
+        char16_t *dest, int32_t destCapacity, Edits *edits,
+        UErrorCode &errorCode) {
+    LocalPointer<BreakIterator> ownedIter;
+    iter = ustrcase_getTitleBreakIterator(nullptr, locale, options, iter, ownedIter, errorCode);
+    if(iter==nullptr) {
+        return 0;
+    }
+    UnicodeString s(srcLength<0, src, srcLength);
+    iter->setText(s);
+    return ustrcase_map(
+        ustrcase_getCaseLocale(locale), options, iter,
+        dest, destCapacity,
+        src, srcLength,
+        ustrcase_internalToTitle, edits, errorCode);
+}
+
+U_NAMESPACE_END
+
+U_NAMESPACE_USE
+
+U_CAPI int32_t U_EXPORT2
+u_strToTitle(char16_t *dest, int32_t destCapacity,
+             const char16_t *src, int32_t srcLength,
+             UBreakIterator *titleIter,
+             const char *locale,
+             UErrorCode *pErrorCode) {
+    LocalPointer<BreakIterator> ownedIter;
+    BreakIterator *iter = ustrcase_getTitleBreakIterator(
+        nullptr, locale, 0, reinterpret_cast<BreakIterator *>(titleIter),
+        ownedIter, *pErrorCode);
+    if (iter == nullptr) {
+        return 0;
+    }
+    UnicodeString s(srcLength<0, src, srcLength);
+    iter->setText(s);
+    return ustrcase_mapWithOverlap(
+        ustrcase_getCaseLocale(locale), 0, iter,
+        dest, destCapacity,
+        src, srcLength,
+        ustrcase_internalToTitle, *pErrorCode);
+}
+
+U_CAPI int32_t U_EXPORT2
+ucasemap_toTitle(UCaseMap *csm,
+                 char16_t *dest, int32_t destCapacity,
+                 const char16_t *src, int32_t srcLength,
+                 UErrorCode *pErrorCode) {
+    if (U_FAILURE(*pErrorCode)) {
+        return 0;
+    }
+    if (csm->iter == nullptr) {
+        LocalPointer<BreakIterator> ownedIter;
+        BreakIterator *iter = ustrcase_getTitleBreakIterator(
+            nullptr, csm->locale, csm->options, nullptr, ownedIter, *pErrorCode);
+        if (iter == nullptr) {
+            return 0;
+        }
+        csm->iter = ownedIter.orphan();
+    }
+    UnicodeString s(srcLength<0, src, srcLength);
+    csm->iter->setText(s);
+    return ustrcase_map(
+        csm->caseLocale, csm->options, csm->iter,
+        dest, destCapacity,
+        src, srcLength,
+        ustrcase_internalToTitle, nullptr, *pErrorCode);
+}
+
+#endif  // !UCONFIG_NO_BREAK_ITERATION