AK: Implement StringBuilder::append_as_lowercase(char ch)

This patch adds a convenience method to AK::StringBuilder which converts
ASCII uppercase characters to lowercase before appending them.

2 files changed, 9 insertions, 0 deletions

diff --git a/AK/StringBuilder.cpp b/AK/StringBuilder.cpp
index b05488e00d..5678d1de79 100644
--- a/AK/StringBuilder.cpp
+++ b/AK/StringBuilder.cpp
@@ -120,6 +120,14 @@ void StringBuilder::append(const Utf32View& utf32_view)
     }
 }
 
+void StringBuilder::append_as_lowercase(char ch)
+{
+    if (ch >= 'A' && ch <= 'Z')
+        append(ch + 0x20);
+    else
+        append(ch);
+}
+
 void StringBuilder::append_escaped_for_json(const StringView& string)
 {
     for (auto ch : string) {
diff --git a/AK/StringBuilder.h b/AK/StringBuilder.h
index 1ad64d4f39..bc0470a211 100644
--- a/AK/StringBuilder.h
+++ b/AK/StringBuilder.h
@@ -28,6 +28,7 @@ public:
     void append(const char*, size_t);
     void appendvf(const char*, va_list);
 
+    void append_as_lowercase(char);
     void append_escaped_for_json(const StringView&);
 
     template<typename... Parameters>