Adapt the remaining OUString functions to std string_view

...for LIBO_INTERNAL_ONLY.  These had been missed by
1b43cceaea2084a0489db68cd0113508f34b6643 "Make many OUString functions take
std::u16string_view parameters" because they did not match the multi-overload
pattern that was addressed there, but they nevertheless benefit from being
changed just as well (witness e.g. the various resulting changes from copy() to
subView()).

This showed a conversion from OStringChar to std::string_view to be missing
(while the corresponding conversion form OUStringChar to std::u16string_view was
already present).

The improvement to loplugin:stringadd became necessary to fix

> [CPT] compilerplugins/clang/test/stringadd.cxx
> error: 'error' diagnostics expected but not seen:
>   File ~/lo/core/compilerplugins/clang/test/stringadd.cxx Line 43 (directive at ~/lo/core/compilerplugins/clang/test/stringadd.cxx:42): simplify by merging with the preceding assignment [loplugin:stringadd]
>   File ~/lo/core/compilerplugins/clang/test/stringadd.cxx Line 61 (directive at ~/lo/core/compilerplugins/clang/test/stringadd.cxx:60): simplify by merging with the preceding assignment [loplugin:stringadd]
> 2 errors generated.

Change-Id: Ie40de0616a66e60e289c1af0ca60aed6f9ecc279
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107602
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

3 files changed, 6 insertions, 5 deletions

diff --git a/sax/source/tools/fastserializer.cxx b/sax/source/tools/fastserializer.cxx
index 792784eb2a9c..e6538424891c 100644
--- a/sax/source/tools/fastserializer.cxx
+++ b/sax/source/tools/fastserializer.cxx
@@ -91,7 +91,7 @@ namespace sax_fastparser {
         mnDoubleStrCapacity = RTL_STR_MAX_VALUEOFDOUBLE;
     }
 
-    void FastSaxSerializer::write( const OUString& sOutput, bool bEscape )
+    void FastSaxSerializer::write( std::u16string_view sOutput, bool bEscape )
     {
         write( OUStringToOString(sOutput, RTL_TEXTENCODING_UTF8), bEscape );
 
diff --git a/sax/source/tools/fastserializer.hxx b/sax/source/tools/fastserializer.hxx
index 0b7ad72d8c0c..109ada3c726f 100644
--- a/sax/source/tools/fastserializer.hxx
+++ b/sax/source/tools/fastserializer.hxx
@@ -28,6 +28,7 @@
 #include "CachedOutputStream.hxx"
 
 #include <stack>
+#include <string_view>
 #include <map>
 #include <memory>
 
@@ -111,7 +112,7 @@ public:
     OString getId( ::sal_Int32 Element );
 
     void write( double value );
-    void write( const OUString& s, bool bEscape = false );
+    void write( std::u16string_view s, bool bEscape = false );
     void write( const OString& s, bool bEscape = false );
     void write( const char* pStr, sal_Int32 nLen, bool bEscape = false );
 
diff --git a/sax/source/tools/fshelper.cxx b/sax/source/tools/fshelper.cxx
index 39b01f175176..b285ba9f3219 100644
--- a/sax/source/tools/fshelper.cxx
+++ b/sax/source/tools/fshelper.cxx
@@ -86,7 +86,7 @@ FastSerializerHelper* FastSerializerHelper::write(const OString& value)
     return this;
 }
 
-FastSerializerHelper* FastSerializerHelper::write(const OUString& value)
+FastSerializerHelper* FastSerializerHelper::write(std::u16string_view value)
 {
     mpSerializer->write(value);
     return this;
@@ -116,9 +116,9 @@ FastSerializerHelper* FastSerializerHelper::writeEscaped(const char* value)
     return this;
 }
 
-FastSerializerHelper* FastSerializerHelper::writeEscaped(const OUString& value)
+FastSerializerHelper* FastSerializerHelper::writeEscaped(std::u16string_view value)
 {
-    if (!value.isEmpty())
+    if (!value.empty())
         mpSerializer->write(value, true);
     return this;
 }