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AK: Add StringBuilder::append(Utf32View)

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This encodes the incoming UTF-32 sequence as UTF-8.
This commit is contained in:
Andreas Kling 2020-05-17 20:03:03 +02:00
parent bc6f469544
commit 86242f9c18
Notes: sideshowbarker 2024-07-19 06:33:16 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/86242f9c181
2 changed files with 28 additions and 0 deletions
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27
AK/StringBuilder.cpp
View file

@ -30,6 +30,7 @@
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <AK/Utf32View.h>
namespace AK {
@ -112,4 +113,30 @@ void StringBuilder::clear()
m_length = 0;
}
void StringBuilder::append(const Utf32View& utf32_view)
{
for (size_t i = 0; i < utf32_view.length(); ++i) {
auto codepoint = utf32_view.codepoints()[i];
if (codepoint <= 0x7f) {
append((char)codepoint);
} else if (codepoint <= 0x07ff) {
append((char)(((codepoint >> 6) & 0x1f) | 0xc0));
append((char)(((codepoint >> 0) & 0x3f) | 0x80));
} else if (codepoint <= 0xffff) {
append((char)(((codepoint >> 12) & 0x0f) | 0xe0));
append((char)(((codepoint >> 6) & 0x3f) | 0x80));
append((char)(((codepoint >> 0) & 0x3f) | 0x80));
} else if (codepoint <= 0x10ffff) {
append((char)(((codepoint >> 18) & 0x07) | 0xf0));
append((char)(((codepoint >> 12) & 0x3f) | 0x80));
append((char)(((codepoint >> 6) & 0x3f) | 0x80));
append((char)(((codepoint >> 0) & 0x3f) | 0x80));
} else {
append(0xef);
append(0xbf);
append(0xbd);
}
}
}
}

1
AK/StringBuilder.h
View file

@ -40,6 +40,7 @@ public:
~StringBuilder() {}
void append(const StringView&);
void append(const Utf32View&);
void append(char);
void append(const char*, size_t);
void appendf(const char*, ...);