AK: Add String constructor from ReadonlyBytes.

Author: https://github.com/asynts
Commit: https://github.com/SerenityOS/serenity/commit/75cde94c6a7
Pull-request: https://github.com/SerenityOS/serenity/pull/3007
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/nico

AK/String.h

@@ -83,6 +83,11 @@ public:
     {
     }
 
+    explicit String(ReadonlyBytes bytes, ShouldChomp shouldChomp = NoChomp)
+        : m_impl(StringImpl::create(bytes, shouldChomp))
+    {
+    }
+
     String(const StringImpl& impl)
         : m_impl(const_cast<StringImpl&>(impl))
     {
@@ -196,6 +201,18 @@ public:
         return *this;
     }
 
+    String& operator=(std::nullptr_t)
+    {
+        m_impl = nullptr;
+        return *this;
+    }
+
+    String& operator=(ReadonlyBytes bytes)
+    {
+        m_impl = StringImpl::create(bytes);
+        return *this;
+    }
+
     u32 hash() const
     {
         if (!m_impl)

AK/StringImpl.cpp

@@ -133,6 +133,11 @@ RefPtr<StringImpl> StringImpl::create(const char* cstring, ShouldChomp shouldCho
     return create(cstring, strlen(cstring), shouldChomp);
 }
 
+RefPtr<StringImpl> StringImpl::create(ReadonlyBytes bytes, ShouldChomp shouldChomp)
+{
+    return StringImpl::create(reinterpret_cast<const char*>(bytes.data()), bytes.size(), shouldChomp);
+}
+
 static inline bool is_ascii_lowercase(char c)
 {
     return c >= 'a' && c <= 'z';

AK/StringImpl.h

@@ -45,6 +45,7 @@ public:
     static NonnullRefPtr<StringImpl> create_uninitialized(size_t length, char*& buffer);
     static RefPtr<StringImpl> create(const char* cstring, ShouldChomp = NoChomp);
     static RefPtr<StringImpl> create(const char* cstring, size_t length, ShouldChomp = NoChomp);
+    static RefPtr<StringImpl> create(ReadonlyBytes, ShouldChomp = NoChomp);
     NonnullRefPtr<StringImpl> to_lowercase() const;
     NonnullRefPtr<StringImpl> to_uppercase() const;