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Each of these strings would previously rely on StringView's char const* constructor overload, which would call __builtin_strlen on the string. Since we now have operator ""sv, we can replace these with much simpler versions. This opens the door to being able to remove StringView(char const*). No functional changes.
208 lines
4.7 KiB
C++
208 lines
4.7 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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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/Checked.h>
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#include <AK/PrintfImplementation.h>
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#include <AK/StdLibExtras.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/Utf32View.h>
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#ifndef KERNEL
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# include <AK/String.h>
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# include <AK/Utf16View.h>
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#endif
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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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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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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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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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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::appendvf(char const* fmt, va_list ap)
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{
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printf_internal([this](char*&, char ch) {
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append(ch);
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},
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nullptr, fmt, ap);
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}
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ByteBuffer StringBuilder::to_byte_buffer() const
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{
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// FIXME: Handle OOM failure.
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return ByteBuffer::copy(data(), length()).release_value_but_fixme_should_propagate_errors();
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}
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#ifndef KERNEL
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String StringBuilder::to_string() const
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{
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if (is_empty())
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return String::empty();
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return String((char const*)data(), length());
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}
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String StringBuilder::build() const
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{
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return to_string();
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}
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#endif
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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 = AK::UnicodeUtils::code_point_to_utf8(code_point, [this](char c) { 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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MUST(try_append_code_point(code_point));
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}
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#ifndef KERNEL
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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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#endif
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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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