Take StringView in more places

We should work towards a pattern where we take StringView as function
arguments, and store String as member, to push the String construction
to the last possible moment.

AK/AKString.h

@@ -87,7 +87,7 @@ public:
     };
 
     static String repeated(char, int count);
-    bool matches(const String& pattern, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
+    bool matches(const StringView& pattern, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
 
     int to_int(bool& ok) const;
     unsigned to_uint(bool& ok) const;
@@ -122,7 +122,7 @@ public:
         return (*m_impl)[i];
     }
 
-    bool ends_with(const String&) const;
+    bool ends_with(const StringView&) const;
 
     bool operator==(const String&) const;
     bool operator!=(const String& other) const { return !(*this == other); }
@@ -166,7 +166,7 @@ public:
     StringView view() const { return { characters(), length() }; }
 
 private:
-    bool match_helper(const String& mask) const;
+    bool match_helper(const StringView& mask) const;
     RetainPtr<StringImpl> m_impl;
 };
 

AK/BufferStream.h

@@ -36,15 +36,7 @@ public:
         m_buffer[m_offset++] = (byte)(value >> 24) & 0xffu;
     }
 
-    void operator<<(const char* str)
+    void operator<<(const StringView& value)
-    {
-        ssize_t len = strlen(str);
-        ASSERT(len >= 0);
-        for (ssize_t i = 0; i < len; ++i)
-            m_buffer[m_offset++] = str[i];
-    }
-
-    void operator<<(const String& value)
     {
         for (ssize_t i = 0; i < value.length(); ++i)
             m_buffer[m_offset++] = value[i];

AK/FileSystemPath.cpp

@@ -5,7 +5,7 @@
 
 namespace AK {
 
-FileSystemPath::FileSystemPath(const String& s)
+FileSystemPath::FileSystemPath(const StringView& s)
     : m_string(s)
 {
     m_is_valid = canonicalize();

AK/FileSystemPath.h

@@ -7,7 +7,7 @@ namespace AK {
 class FileSystemPath {
 public:
     FileSystemPath() {}
-    explicit FileSystemPath(const String&);
+    explicit FileSystemPath(const StringView&);
 
     bool is_valid() const { return m_is_valid; }
     String string() const { return m_string; }

AK/String.cpp

@@ -175,7 +175,7 @@ String String::format(const char* fmt, ...)
     return builder.to_string();
 }
 
-bool String::ends_with(const String& str) const
+bool String::ends_with(const StringView& str) const
 {
     if (str.is_empty())
         return true;
@@ -196,20 +196,20 @@ String String::repeated(char ch, int count)
     return *impl;
 }
 
-bool String::matches(const String& mask, CaseSensitivity case_sensitivity) const
+bool String::matches(const StringView& mask, CaseSensitivity case_sensitivity) const
 {
     if (case_sensitivity == CaseSensitivity::CaseInsensitive) {
         String this_lower = this->to_lowercase();
-        String mask_lower = mask.to_lowercase();
+        String mask_lower = String(mask).to_lowercase();
         return this_lower.match_helper(mask_lower);
     }
 
     return match_helper(mask);
 }
 
-bool String::match_helper(const String& mask) const
+bool String::match_helper(const StringView& mask) const
 {
-    if (is_null() || mask.is_null())
+    if (is_null())
         return false;
 
     const char* string_ptr = characters();

AK/StringBuilder.cpp

@@ -16,7 +16,7 @@ StringBuilder::StringBuilder(ssize_t initial_capacity)
     m_buffer.grow(initial_capacity);
 }
 
-void StringBuilder::append(const String& str)
+void StringBuilder::append(const StringView& str)
 {
     if (str.is_empty())
         return;

AK/StringBuilder.h

@@ -11,7 +11,7 @@ public:
     explicit StringBuilder(ssize_t initial_capacity = 16);
     ~StringBuilder() {}
 
-    void append(const String&);
+    void append(const StringView&);
     void append(char);
     void append(const char*, ssize_t);
     void appendf(const char*, ...);

Applications/FileManager/DirectoryView.cpp

@@ -108,7 +108,7 @@ void DirectoryView::set_view_mode(ViewMode mode)
     ASSERT_NOT_REACHED();
 }
 
-void DirectoryView::add_path_to_history(const String& path)
+void DirectoryView::add_path_to_history(const StringView& path)
 {
     if (m_path_history_position < m_path_history.size())
         m_path_history.resize(m_path_history_position + 1);
@@ -117,13 +117,13 @@ void DirectoryView::add_path_to_history(const String& path)
     m_path_history_position = m_path_history.size() - 1;
 }
 
-void DirectoryView::open(const String& path)
+void DirectoryView::open(const StringView& path)
 {
     add_path_to_history(path);
     model().open(path);
 }
 
-void DirectoryView::set_status_message(const String& message)
+void DirectoryView::set_status_message(const StringView& message)
 {
     if (on_status_message)
         on_status_message(message);

Applications/FileManager/DirectoryView.h

@@ -12,7 +12,7 @@ public:
     explicit DirectoryView(GWidget* parent);
     virtual ~DirectoryView() override;
 
-    void open(const String& path);
+    void open(const StringView& path);
     String path() const { return model().path(); }
     void open_parent_directory();
     void open_previous_directory();
@@ -22,8 +22,8 @@ public:
 
     void refresh();
 
-    Function<void(const String&)> on_path_change;
+    Function<void(const StringView&)> on_path_change;
-    Function<void(String)> on_status_message;
+    Function<void(const StringView&)> on_status_message;
     Function<void(int done, int total)> on_thumbnail_progress;
 
     enum ViewMode
@@ -41,14 +41,14 @@ private:
 
     void handle_activation(const GModelIndex&);
 
-    void set_status_message(const String&);
+    void set_status_message(const StringView&);
 
     ViewMode m_view_mode { Invalid };
 
     Retained<GDirectoryModel> m_model;
     int m_path_history_position { 0 };
     Vector<String> m_path_history;
-    void add_path_to_history(const String& path);
+    void add_path_to_history(const StringView& path);
 
     GTableView* m_table_view { nullptr };
     GItemView* m_item_view { nullptr };

Applications/FileManager/main.cpp

@@ -199,8 +199,8 @@ int main(int argc, char** argv)
         go_back_action->set_enabled(directory_view->path_history_position() > 0);
     };
 
-    directory_view->on_status_message = [statusbar] (String message) {
+    directory_view->on_status_message = [statusbar] (const StringView& message) {
-        statusbar->set_text(move(message));
+        statusbar->set_text(message);
     };
 
     directory_view->on_thumbnail_progress = [&] (int done, int total) {

LibCore/CDirIterator.cpp

@@ -1,7 +1,7 @@
 #include "CDirIterator.h"
 #include <cerrno>
 
-CDirIterator::CDirIterator(const String& path, Flags flags)
+CDirIterator::CDirIterator(const StringView& path, Flags flags)
     : m_flags(flags)
 {
     m_dir = opendir(path.characters());

LibCore/CDirIterator.h

@@ -11,7 +11,7 @@ public:
         SkipDots = 0x1,
     };
 
-    CDirIterator(const String& path, Flags = Flags::NoFlags);
+    CDirIterator(const StringView& path, Flags = Flags::NoFlags);
     ~CDirIterator();
 
     bool has_error() const { return m_error != 0; }

LibCore/CFile.cpp

@@ -3,7 +3,7 @@
 #include <stdio.h>
 #include <unistd.h>
 
-CFile::CFile(const String& filename)
+CFile::CFile(const StringView& filename)
     : m_filename(filename)
 {
 }

LibCore/CFile.h

@@ -6,11 +6,11 @@
 class CFile final : public CIODevice {
 public:
     CFile() {}
-    explicit CFile(const String&);
+    explicit CFile(const StringView&);
     virtual ~CFile() override;
 
     String filename() const { return m_filename; }
-    void set_filename(const String& filename) { m_filename = filename; }
+    void set_filename(const StringView& filename) { m_filename = filename; }
 
     virtual bool open(CIODevice::OpenMode) override;