mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-08-17 09:20:28 +03:00
292 lines
7.4 KiB
C++
292 lines
7.4 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteBuffer.h>
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#include <AK/ByteString.h>
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#include <AK/Checked.h>
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#include <AK/FlyString.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <AK/UnicodeUtils.h>
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#include <AK/Utf16View.h>
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#include <AK/Utf32View.h>
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namespace AK {
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inline ErrorOr<void> StringBuilder::will_append(size_t size)
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{
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if (m_use_inline_capacity_only == UseInlineCapacityOnly::Yes) {
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VERIFY(m_buffer.capacity() == StringBuilder::inline_capacity);
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Checked<size_t> current_pointer = m_buffer.size();
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current_pointer += size;
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VERIFY(!current_pointer.has_overflow());
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if (current_pointer <= StringBuilder::inline_capacity) {
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return {};
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}
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return Error::from_errno(ENOMEM);
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}
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Checked<size_t> needed_capacity = m_buffer.size();
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needed_capacity += size;
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VERIFY(!needed_capacity.has_overflow());
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// Prefer to completely use the existing capacity first
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if (needed_capacity <= m_buffer.capacity())
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return {};
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Checked<size_t> expanded_capacity = needed_capacity;
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expanded_capacity *= 2;
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VERIFY(!expanded_capacity.has_overflow());
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TRY(m_buffer.try_ensure_capacity(expanded_capacity.value()));
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return {};
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}
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ErrorOr<StringBuilder> StringBuilder::create(size_t initial_capacity)
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{
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StringBuilder builder;
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TRY(builder.m_buffer.try_ensure_capacity(initial_capacity));
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return builder;
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}
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StringBuilder::StringBuilder(size_t initial_capacity)
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{
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m_buffer.ensure_capacity(initial_capacity);
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}
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StringBuilder::StringBuilder(UseInlineCapacityOnly use_inline_capacity_only)
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: m_use_inline_capacity_only(use_inline_capacity_only)
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{
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}
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size_t StringBuilder::length() const
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{
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return m_buffer.size();
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}
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bool StringBuilder::is_empty() const
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{
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return m_buffer.is_empty();
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}
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void StringBuilder::trim(size_t count)
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{
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auto decrease_count = min(m_buffer.size(), count);
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m_buffer.resize(m_buffer.size() - decrease_count);
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}
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ErrorOr<void> StringBuilder::try_append(StringView string)
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{
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if (string.is_empty())
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return {};
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TRY(will_append(string.length()));
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TRY(m_buffer.try_append(string.characters_without_null_termination(), string.length()));
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return {};
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}
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ErrorOr<void> StringBuilder::try_append(char ch)
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{
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TRY(will_append(1));
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TRY(m_buffer.try_append(ch));
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return {};
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}
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ErrorOr<void> StringBuilder::try_append_repeated(char ch, size_t n)
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{
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TRY(will_append(n));
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for (size_t i = 0; i < n; ++i)
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TRY(try_append(ch));
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return {};
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}
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void StringBuilder::append(StringView string)
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{
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MUST(try_append(string));
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}
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ErrorOr<void> StringBuilder::try_append(char const* characters, size_t length)
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{
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return try_append(StringView { characters, length });
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}
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void StringBuilder::append(char const* characters, size_t length)
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{
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MUST(try_append(characters, length));
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}
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void StringBuilder::append(char ch)
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{
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MUST(try_append(ch));
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}
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void StringBuilder::append_repeated(char ch, size_t n)
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{
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MUST(try_append_repeated(ch, n));
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}
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ErrorOr<ByteBuffer> StringBuilder::to_byte_buffer() const
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{
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return ByteBuffer::copy(data(), length());
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}
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ByteString StringBuilder::to_byte_string() const
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{
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if (is_empty())
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return ByteString::empty();
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return ByteString((char const*)data(), length());
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}
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ErrorOr<String> StringBuilder::to_string() const
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{
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return String::from_utf8(string_view());
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}
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String StringBuilder::to_string_without_validation() const
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{
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return String::from_utf8_without_validation(string_view().bytes());
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}
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FlyString StringBuilder::to_fly_string_without_validation() const
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{
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return FlyString::from_utf8_without_validation(string_view().bytes());
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}
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ErrorOr<FlyString> StringBuilder::to_fly_string() const
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{
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return FlyString::from_utf8(string_view());
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}
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u8* StringBuilder::data()
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{
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return m_buffer.data();
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}
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u8 const* StringBuilder::data() const
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{
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return m_buffer.data();
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}
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StringView StringBuilder::string_view() const
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{
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return StringView { data(), m_buffer.size() };
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}
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void StringBuilder::clear()
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{
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m_buffer.clear();
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}
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ErrorOr<void> StringBuilder::try_append_code_point(u32 code_point)
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{
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auto nwritten = TRY(AK::UnicodeUtils::try_code_point_to_utf8(code_point, [this](char c) { return try_append(c); }));
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if (nwritten < 0) {
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TRY(try_append(0xef));
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TRY(try_append(0xbf));
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TRY(try_append(0xbd));
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}
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return {};
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}
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void StringBuilder::append_code_point(u32 code_point)
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{
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if (code_point <= 0x7f) {
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m_buffer.append(static_cast<char>(code_point));
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} else if (code_point <= 0x07ff) {
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(void)will_append(2);
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m_buffer.append(static_cast<char>((((code_point >> 6) & 0x1f) | 0xc0)));
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m_buffer.append(static_cast<char>((((code_point >> 0) & 0x3f) | 0x80)));
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} else if (code_point <= 0xffff) {
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(void)will_append(3);
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m_buffer.append(static_cast<char>((((code_point >> 12) & 0x0f) | 0xe0)));
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m_buffer.append(static_cast<char>((((code_point >> 6) & 0x3f) | 0x80)));
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m_buffer.append(static_cast<char>((((code_point >> 0) & 0x3f) | 0x80)));
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} else if (code_point <= 0x10ffff) {
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(void)will_append(4);
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m_buffer.append(static_cast<char>((((code_point >> 18) & 0x07) | 0xf0)));
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m_buffer.append(static_cast<char>((((code_point >> 12) & 0x3f) | 0x80)));
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m_buffer.append(static_cast<char>((((code_point >> 6) & 0x3f) | 0x80)));
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m_buffer.append(static_cast<char>((((code_point >> 0) & 0x3f) | 0x80)));
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} else {
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(void)will_append(3);
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m_buffer.append(0xef);
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m_buffer.append(0xbf);
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m_buffer.append(0xbd);
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}
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}
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ErrorOr<void> StringBuilder::try_append(Utf16View const& utf16_view)
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{
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for (size_t i = 0; i < utf16_view.length_in_code_units();) {
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auto code_point = utf16_view.code_point_at(i);
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TRY(try_append_code_point(code_point));
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i += (code_point > 0xffff ? 2 : 1);
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}
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return {};
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}
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void StringBuilder::append(Utf16View const& utf16_view)
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{
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MUST(try_append(utf16_view));
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}
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ErrorOr<void> StringBuilder::try_append(Utf32View const& utf32_view)
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{
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for (size_t i = 0; i < utf32_view.length(); ++i) {
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auto code_point = utf32_view.code_points()[i];
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TRY(try_append_code_point(code_point));
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}
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return {};
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}
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void StringBuilder::append(Utf32View const& utf32_view)
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{
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MUST(try_append(utf32_view));
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}
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void StringBuilder::append_as_lowercase(char ch)
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{
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if (ch >= 'A' && ch <= 'Z')
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append(ch + 0x20);
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else
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append(ch);
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}
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void StringBuilder::append_escaped_for_json(StringView string)
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{
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MUST(try_append_escaped_for_json(string));
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}
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ErrorOr<void> StringBuilder::try_append_escaped_for_json(StringView string)
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{
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for (auto ch : string) {
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switch (ch) {
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case '\b':
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TRY(try_append("\\b"sv));
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break;
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case '\n':
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TRY(try_append("\\n"sv));
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break;
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case '\t':
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TRY(try_append("\\t"sv));
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break;
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case '\"':
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TRY(try_append("\\\""sv));
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break;
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case '\\':
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TRY(try_append("\\\\"sv));
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break;
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default:
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if (ch >= 0 && ch <= 0x1f)
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TRY(try_appendff("\\u{:04x}", ch));
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else
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TRY(try_append(ch));
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}
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}
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return {};
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}
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}
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