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/* Copyright (c) 2021 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
#pragma once
#include <optional>
#include <string>
#include <string_view>
#include <tuple>
#include "antlr4-common.h"
namespace antlrcpp {
class ANTLR4CPP_PUBLIC Utf8 final {
public:
// Decodes the next code point, returning the decoded code point and the number
// of code units (a.k.a. bytes) consumed. In the event that an invalid code unit
// sequence is returned the replacement character, U+FFFD, is returned with a
// code unit count of 1. As U+FFFD requires 3 code units when encoded, this can
// be used to differentiate valid input from malformed input.
static std::pair<char32_t, size_t> decode(std::string_view input);
// Decodes the given UTF-8 encoded input into a string of code points.
static std::optional<std::u32string> strictDecode(std::string_view input);
// Decodes the given UTF-8 encoded input into a string of code points. Unlike strictDecode(),
// each byte in an illegal byte sequence is replaced with the Unicode replacement character,
// U+FFFD.
static std::u32string lenientDecode(std::string_view input);
// Encodes the given code point and appends it to the buffer. If the code point
// is an unpaired surrogate or outside of the valid Unicode range it is replaced
// with the replacement character, U+FFFD.
static std::string& encode(std::string *buffer, char32_t codePoint);
// Encodes the given Unicode code point string as UTF-8.
static std::optional<std::string> strictEncode(std::u32string_view input);
// Encodes the given Unicode code point string as UTF-8. Unlike strictEncode(),
// each invalid Unicode code point is replaced with the Unicode replacement character, U+FFFD.
static std::string lenientEncode(std::u32string_view input);
private:
Utf8() = delete;
Utf8(const Utf8&) = delete;
Utf8(Utf8&&) = delete;
Utf8& operator=(const Utf8&) = delete;
Utf8& operator=(Utf8&&) = delete;
};
}
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