Imported Upstream version 58.2

[platform/upstream/icu.git] / source / common / unistr_titlecase_brkiter.cpp

diff --git a/source/common/unistr_titlecase_brkiter.cpp b/source/common/unistr_titlecase_brkiter.cpp
index 3156fdf..3d6737c 100644 (file)
--- a/source/common/unistr_titlecase_brkiter.cpp
+++ b/source/common/unistr_titlecase_brkiter.cpp
@@ -1,4 +1,4 @@
-// © 2016 and later: Unicode, Inc. and others.
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 /*
 *******************************************************************************
@@ -6,7 +6,7 @@
 *   Corporation and others.  All Rights Reserved.
 *******************************************************************************
 *   file name:  unistr_titlecase_brkiter.cpp
-*   encoding:   UTF-8
+*   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:2
 *
@@ -22,10 +22,36 @@
 #if !UCONFIG_NO_BREAK_ITERATION
 
 #include "unicode/brkiter.h"
-#include "unicode/locid.h"
-#include "unicode/ucasemap.h"
+#include "unicode/ubrk.h"
 #include "unicode/unistr.h"
-#include "ucasemap_imp.h"
+#include "unicode/ustring.h"
+#include "cmemory.h"
+#include "ustr_imp.h"
+
+static int32_t U_CALLCONV
+unistr_case_internalToTitle(const UCaseMap *csm,
+                            UChar *dest, int32_t destCapacity,
+                            const UChar *src, int32_t srcLength,
+                            UErrorCode *pErrorCode) {
+  ubrk_setText(csm->iter, src, srcLength, pErrorCode);
+  return ustrcase_internalToTitle(csm, dest, destCapacity, src, srcLength, pErrorCode);
+}
+
+/*
+ * Set parameters on an empty UCaseMap, for UCaseMap-less API functions.
+ * Do this fast because it is called with every function call.
+ */
+static inline void
+setTempCaseMap(UCaseMap *csm, const char *locale) {
+    if(csm->csp==NULL) {
+        csm->csp=ucase_getSingleton();
+    }
+    if(locale!=NULL && locale[0]==0) {
+        csm->locale[0]=0;
+    } else {
+        ustrcase_setTempCaseMapLocale(csm, locale);
+    }
+}
 
 U_NAMESPACE_BEGIN
 
@@ -41,6 +67,9 @@ UnicodeString::toTitle(BreakIterator *titleIter, const Locale &locale) {
 
 UnicodeString &
 UnicodeString::toTitle(BreakIterator *titleIter, const Locale &locale, uint32_t options) {
+  UCaseMap csm=UCASEMAP_INITIALIZER;
+  csm.options=options;
+  setTempCaseMap(&csm, locale.getName());
   BreakIterator *bi=titleIter;
   if(bi==NULL) {
     UErrorCode errorCode=U_ZERO_ERROR;
@@ -50,12 +79,8 @@ UnicodeString::toTitle(BreakIterator *titleIter, const Locale &locale, uint32_t
       return *this;
     }
   }
-  // Because the "this" string is both the source and the destination,
-  // make a copy of the original source for use by the break iterator.
-  // See tickets #13127 and #13128
-  UnicodeString copyOfInput(*this);
-  bi->setText(copyOfInput);
-  caseMap(ustrcase_getCaseLocale(locale.getBaseName()), options, bi, ustrcase_internalToTitle);
+  csm.iter=reinterpret_cast<UBreakIterator *>(bi);
+  caseMap(&csm, unistr_case_internalToTitle);
   if(titleIter==NULL) {
     delete bi;
   }