Related: #i56998# provide a way to format % per-locale rules

Change-Id: Ic27b230cc9dce366f281ff720ded5873e94f6191

i18nutil/Library_i18nutil.mk

@@ -21,6 +21,8 @@ $(eval $(call gb_Library_Library,i18nutil))
 $(eval $(call gb_Library_use_externals,i18nutil,\
 	boost_headers \
 	icu_headers \
+	icui18n \
+	icuuc \
 ))
 
 $(eval $(call gb_Library_use_custom_headers,i18nutil,\
@@ -34,6 +36,7 @@ $(eval $(call gb_Library_add_defs,i18nutil,\
 ))
 
 $(eval $(call gb_Library_use_libraries,i18nutil,\
+	i18nlangtag \
 	comphelper \
 	cppu \
 	sal \

i18nutil/source/utility/unicode.cxx

@@ -17,10 +17,14 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
+#include <boost/scoped_ptr.hpp>
 #include <com/sun/star/i18n/UnicodeType.hpp>
 #include <com/sun/star/i18n/KCharacterType.hpp>
 #include <com/sun/star/i18n/ScriptType.hpp>
+#include <i18nlangtag/languagetag.hxx>
+#include <i18nlangtag/languagetagicu.hxx>
 #include <i18nutil/unicode.hxx>
+#include <unicode/numfmt.h>
 #include "unicode_data.h"
 
 // Workaround for glibc braindamage:
@@ -934,4 +938,26 @@ OString SAL_CALL unicode::getExemplarLanguageForUScriptCode(UScriptCode eScript)
     return sRet;
 }
 
+//Format a number as a percentage according to the rules of the given
+//language, e.g. 100 -> "100%" for en-US vs "100 %" for de-DE
+OUString SAL_CALL unicode::formatPercent(double dNumber,
+    const LanguageTag &rLangTag)
+{
+    // get a currency formatter for this locale ID
+    UErrorCode errorCode=U_ZERO_ERROR;
+    icu::Locale aLocale = LanguageTagIcu::getIcuLocale(rLangTag);
+    boost::scoped_ptr<NumberFormat> xF(
+        NumberFormat::createPercentInstance(aLocale, errorCode));
+    if(U_FAILURE(errorCode))
+    {
+        SAL_WARN("i18n", "NumberFormat::createPercentInstance failed");
+        return OUString::number(dNumber) + "%";
+    }
+
+    UnicodeString output;
+    xF->format(dNumber, output);
+    return OUString(reinterpret_cast<const sal_Unicode *>(output.getBuffer()),
+        output.length());
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

include/i18nutil/unicode.hxx

@@ -24,6 +24,8 @@
 #include <unicode/uscript.h>
 #include <i18nutil/i18nutildllapi.h>
 
+class LanguageTag;
+
 typedef struct _ScriptTypeList {
     sal_Int16 from;
     sal_Int16 to;
@@ -54,6 +56,11 @@ public:
 
     //Return a language that can be written in a given ISO 15924 script code
     static OString SAL_CALL getExemplarLanguageForUScriptCode(UScriptCode eScript);
+
+    //Format a number as a percentage according to the rules of the given
+    //language, e.g. 100 -> "100%" for en-US vs "100 %" for de-DE
+    static OUString SAL_CALL formatPercent(double dNumber,
+        const LanguageTag &rLangTag);
 };
 
 #endif