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073bcfd386
These don't have to worry about the input not being valid UTF-8 and
so can be infallible (and can even return self if no changes needed.)
We use this instead of Infra::to_ascii_{upper,lower}_case in LibWeb.
462 lines
14 KiB
C++
462 lines
14 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.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/Array.h>
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#include <AK/Checked.h>
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#include <AK/Endian.h>
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#include <AK/FlyString.h>
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#include <AK/Format.h>
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#include <AK/MemMem.h>
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#include <AK/Stream.h>
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#include <AK/String.h>
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#include <AK/Utf16View.h>
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#include <AK/Vector.h>
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#include <stdlib.h>
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#include <simdutf.h>
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namespace AK {
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String String::from_utf8_with_replacement_character(StringView view, WithBOMHandling with_bom_handling)
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{
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if (auto bytes = view.bytes(); with_bom_handling == WithBOMHandling::Yes && bytes.size() >= 3 && bytes[0] == 0xEF && bytes[1] == 0xBB && bytes[2] == 0xBF)
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view = view.substring_view(3);
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if (Utf8View(view).validate())
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return String::from_utf8_without_validation(view.bytes());
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StringBuilder builder;
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for (auto c : Utf8View { view })
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builder.append_code_point(c);
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return builder.to_string_without_validation();
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}
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String String::from_utf8_without_validation(ReadonlyBytes bytes)
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{
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String result;
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MUST(result.replace_with_new_string(bytes.size(), [&](Bytes buffer) {
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bytes.copy_to(buffer);
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return ErrorOr<void> {};
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}));
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return result;
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}
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ErrorOr<String> String::from_utf8(StringView view)
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{
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if (!Utf8View { view }.validate())
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return Error::from_string_literal("String::from_utf8: Input was not valid UTF-8");
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String result;
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TRY(result.replace_with_new_string(view.length(), [&](Bytes buffer) {
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view.bytes().copy_to(buffer);
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return ErrorOr<void> {};
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}));
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return result;
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}
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ErrorOr<String> String::from_utf16(Utf16View const& utf16)
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{
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if (!utf16.validate())
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return Error::from_string_literal("String::from_utf16: Input was not valid UTF-16");
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if (utf16.is_empty())
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return String {};
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String result;
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auto utf8_length = [&]() {
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switch (utf16.endianness()) {
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case Endianness::Host:
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return simdutf::utf8_length_from_utf16(utf16.char_data(), utf16.length_in_code_units());
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case Endianness::Big:
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return simdutf::utf8_length_from_utf16be(utf16.char_data(), utf16.length_in_code_units());
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case Endianness::Little:
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return simdutf::utf8_length_from_utf16le(utf16.char_data(), utf16.length_in_code_units());
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}
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VERIFY_NOT_REACHED();
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}();
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TRY(result.replace_with_new_string(utf8_length, [&](Bytes buffer) -> ErrorOr<void> {
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[[maybe_unused]] auto result = [&]() {
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switch (utf16.endianness()) {
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case Endianness::Host:
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return simdutf::convert_utf16_to_utf8(utf16.char_data(), utf16.length_in_code_units(), reinterpret_cast<char*>(buffer.data()));
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case Endianness::Big:
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return simdutf::convert_utf16be_to_utf8(utf16.char_data(), utf16.length_in_code_units(), reinterpret_cast<char*>(buffer.data()));
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case Endianness::Little:
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return simdutf::convert_utf16le_to_utf8(utf16.char_data(), utf16.length_in_code_units(), reinterpret_cast<char*>(buffer.data()));
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}
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VERIFY_NOT_REACHED();
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}();
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ASSERT(result == buffer.size());
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return {};
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}));
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return result;
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}
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ErrorOr<String> String::from_stream(Stream& stream, size_t byte_count)
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{
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String result;
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TRY(result.replace_with_new_string(byte_count, [&](Bytes buffer) -> ErrorOr<void> {
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TRY(stream.read_until_filled(buffer));
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if (!Utf8View { StringView { buffer } }.validate())
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return Error::from_string_literal("String::from_stream: Input was not valid UTF-8");
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return {};
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}));
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return result;
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}
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ErrorOr<String> String::from_string_builder(Badge<StringBuilder>, StringBuilder& builder)
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{
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if (!Utf8View { builder.string_view() }.validate())
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return Error::from_string_literal("String::from_string_builder: Input was not valid UTF-8");
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String result;
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result.replace_with_string_builder(builder);
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return result;
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}
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String String::from_string_builder_without_validation(Badge<StringBuilder>, StringBuilder& builder)
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{
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String result;
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result.replace_with_string_builder(builder);
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return result;
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}
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ErrorOr<String> String::repeated(u32 code_point, size_t count)
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{
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VERIFY(is_unicode(code_point));
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Array<u8, 4> code_point_as_utf8;
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size_t i = 0;
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size_t code_point_byte_length = UnicodeUtils::code_point_to_utf8(code_point, [&](auto byte) {
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code_point_as_utf8[i++] = static_cast<u8>(byte);
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});
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auto total_byte_count = code_point_byte_length * count;
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String result;
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TRY(result.replace_with_new_string(total_byte_count, [&](Bytes buffer) {
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if (code_point_byte_length == 1) {
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buffer.fill(code_point_as_utf8[0]);
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} else {
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for (i = 0; i < count; ++i)
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memcpy(buffer.data() + (i * code_point_byte_length), code_point_as_utf8.data(), code_point_byte_length);
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}
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return ErrorOr<void> {};
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}));
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return result;
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}
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StringView String::bytes_as_string_view() const&
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{
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return StringView(bytes());
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}
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bool String::is_empty() const
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{
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return bytes().size() == 0;
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}
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ErrorOr<String> String::vformatted(StringView fmtstr, TypeErasedFormatParams& params)
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{
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StringBuilder builder;
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TRY(vformat(builder, fmtstr, params));
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return builder.to_string();
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}
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ErrorOr<Vector<String>> String::split(u32 separator, SplitBehavior split_behavior) const
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{
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return split_limit(separator, 0, split_behavior);
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}
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ErrorOr<Vector<String>> String::split_limit(u32 separator, size_t limit, SplitBehavior split_behavior) const
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{
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Vector<String> result;
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if (is_empty())
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return result;
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bool keep_empty = has_flag(split_behavior, SplitBehavior::KeepEmpty);
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size_t substring_start = 0;
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for (auto it = code_points().begin(); it != code_points().end() && (result.size() + 1) != limit; ++it) {
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u32 code_point = *it;
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if (code_point == separator) {
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size_t substring_length = code_points().iterator_offset(it) - substring_start;
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if (substring_length != 0 || keep_empty)
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TRY(result.try_append(TRY(substring_from_byte_offset_with_shared_superstring(substring_start, substring_length))));
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substring_start = code_points().iterator_offset(it) + it.underlying_code_point_length_in_bytes();
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}
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}
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size_t tail_length = code_points().byte_length() - substring_start;
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if (tail_length != 0 || keep_empty)
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TRY(result.try_append(TRY(substring_from_byte_offset_with_shared_superstring(substring_start, tail_length))));
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return result;
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}
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Optional<size_t> String::find_byte_offset(u32 code_point, size_t from_byte_offset) const
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{
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auto code_points = this->code_points();
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if (from_byte_offset >= code_points.byte_length())
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return {};
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for (auto it = code_points.iterator_at_byte_offset(from_byte_offset); it != code_points.end(); ++it) {
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if (*it == code_point)
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return code_points.byte_offset_of(it);
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}
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return {};
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}
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Optional<size_t> String::find_byte_offset(StringView substring, size_t from_byte_offset) const
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{
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auto view = bytes_as_string_view();
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if (from_byte_offset >= view.length())
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return {};
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auto index = memmem_optional(
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view.characters_without_null_termination() + from_byte_offset, view.length() - from_byte_offset,
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substring.characters_without_null_termination(), substring.length());
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if (index.has_value())
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return *index + from_byte_offset;
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return {};
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}
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bool String::operator==(FlyString const& other) const
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{
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return static_cast<StringBase const&>(*this) == other.data({});
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}
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bool String::operator==(StringView other) const
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{
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return bytes_as_string_view() == other;
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}
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ErrorOr<String> String::substring_from_byte_offset(size_t start, size_t byte_count) const
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{
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if (!byte_count)
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return String {};
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return String::from_utf8(bytes_as_string_view().substring_view(start, byte_count));
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}
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ErrorOr<String> String::substring_from_byte_offset(size_t start) const
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{
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VERIFY(start <= bytes_as_string_view().length());
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return substring_from_byte_offset(start, bytes_as_string_view().length() - start);
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}
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ErrorOr<String> String::substring_from_byte_offset_with_shared_superstring(size_t start, size_t byte_count) const
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{
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return String { TRY(StringBase::substring_from_byte_offset_with_shared_superstring(start, byte_count)) };
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}
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ErrorOr<String> String::substring_from_byte_offset_with_shared_superstring(size_t start) const
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{
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VERIFY(start <= bytes_as_string_view().length());
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return substring_from_byte_offset_with_shared_superstring(start, bytes_as_string_view().length() - start);
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}
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bool String::operator==(char const* c_string) const
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{
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return bytes_as_string_view() == c_string;
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}
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u32 String::ascii_case_insensitive_hash() const
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{
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return case_insensitive_string_hash(reinterpret_cast<char const*>(bytes().data()), bytes().size());
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}
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Utf8View String::code_points() const&
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{
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return Utf8View(bytes_as_string_view());
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}
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ErrorOr<void> Formatter<String>::format(FormatBuilder& builder, String const& utf8_string)
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{
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return Formatter<StringView>::format(builder, utf8_string.bytes_as_string_view());
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}
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ErrorOr<String> String::replace(StringView needle, StringView replacement, ReplaceMode replace_mode) const
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{
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return StringUtils::replace(*this, needle, replacement, replace_mode);
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}
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ErrorOr<String> String::reverse() const
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{
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// FIXME: This handles multi-byte code points, but not e.g. grapheme clusters.
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// FIXME: We could avoid allocating a temporary vector if Utf8View supports reverse iteration.
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auto code_point_length = code_points().length();
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Vector<u32> code_points;
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TRY(code_points.try_ensure_capacity(code_point_length));
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for (auto code_point : this->code_points())
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code_points.unchecked_append(code_point);
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auto builder = TRY(StringBuilder::create(code_point_length * sizeof(u32)));
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while (!code_points.is_empty())
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TRY(builder.try_append_code_point(code_points.take_last()));
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return builder.to_string();
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}
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ErrorOr<String> String::trim(Utf8View const& code_points_to_trim, TrimMode mode) const
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{
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auto trimmed = code_points().trim(code_points_to_trim, mode);
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return String::from_utf8(trimmed.as_string());
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}
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ErrorOr<String> String::trim(StringView code_points_to_trim, TrimMode mode) const
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{
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return trim(Utf8View { code_points_to_trim }, mode);
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}
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ErrorOr<String> String::trim_ascii_whitespace(TrimMode mode) const
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{
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return trim(" \n\t\v\f\r"sv, mode);
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}
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bool String::contains(StringView needle, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::contains(bytes_as_string_view(), needle, case_sensitivity);
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}
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bool String::contains(u32 needle, CaseSensitivity case_sensitivity) const
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{
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auto needle_as_string = String::from_code_point(needle);
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return contains(needle_as_string.bytes_as_string_view(), case_sensitivity);
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}
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bool String::starts_with(u32 code_point) const
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{
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if (is_empty())
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return false;
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return *code_points().begin() == code_point;
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}
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bool String::starts_with_bytes(StringView bytes, CaseSensitivity case_sensitivity) const
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{
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return bytes_as_string_view().starts_with(bytes, case_sensitivity);
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}
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bool String::ends_with(u32 code_point) const
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{
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if (is_empty())
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return false;
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u32 last_code_point = 0;
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for (auto it = code_points().begin(); it != code_points().end(); ++it)
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last_code_point = *it;
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return last_code_point == code_point;
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}
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bool String::ends_with_bytes(StringView bytes, CaseSensitivity case_sensitivity) const
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{
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return bytes_as_string_view().ends_with(bytes, case_sensitivity);
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}
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unsigned Traits<String>::hash(String const& string)
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{
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return string.hash();
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}
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ByteString String::to_byte_string() const
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{
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return ByteString(bytes_as_string_view());
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}
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ErrorOr<String> String::from_byte_string(ByteString const& byte_string)
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{
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return String::from_utf8(byte_string.view());
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}
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String String::to_ascii_lowercase() const
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{
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bool const has_ascii_uppercase = [&] {
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for (u8 const byte : bytes()) {
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if (AK::is_ascii_upper_alpha(byte))
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return true;
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}
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return false;
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}();
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if (!has_ascii_uppercase)
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return *this;
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Vector<u8> lowercase_bytes;
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lowercase_bytes.ensure_capacity(bytes().size());
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for (u8 const byte : bytes()) {
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if (AK::is_ascii_upper_alpha(byte))
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lowercase_bytes.unchecked_append(AK::to_ascii_lowercase(byte));
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else
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lowercase_bytes.unchecked_append(byte);
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}
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return String::from_utf8_without_validation(lowercase_bytes);
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}
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String String::to_ascii_uppercase() const
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{
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bool const has_ascii_lowercase = [&] {
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for (u8 const byte : bytes()) {
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if (AK::is_ascii_lower_alpha(byte))
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return true;
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}
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return false;
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}();
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if (!has_ascii_lowercase)
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return *this;
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Vector<u8> uppercase_bytes;
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uppercase_bytes.ensure_capacity(bytes().size());
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for (u8 const byte : bytes()) {
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if (AK::is_ascii_lower_alpha(byte))
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uppercase_bytes.unchecked_append(AK::to_ascii_uppercase(byte));
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else
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uppercase_bytes.unchecked_append(byte);
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}
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return String::from_utf8_without_validation(uppercase_bytes);
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}
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bool String::equals_ignoring_ascii_case(String const& other) const
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{
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return StringUtils::equals_ignoring_ascii_case(bytes_as_string_view(), other.bytes_as_string_view());
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}
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bool String::equals_ignoring_ascii_case(StringView other) const
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{
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return StringUtils::equals_ignoring_ascii_case(bytes_as_string_view(), other);
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}
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ErrorOr<String> String::repeated(String const& input, size_t count)
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{
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if (Checked<u32>::multiplication_would_overflow(count, input.bytes().size()))
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return Error::from_errno(EOVERFLOW);
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String result;
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size_t input_size = input.bytes().size();
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TRY(result.replace_with_new_string(count * input_size, [&](Bytes buffer) {
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if (input_size == 1) {
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buffer.fill(input.bytes().first());
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} else {
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for (size_t i = 0; i < count; ++i)
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input.bytes().copy_to(buffer.slice(i * input_size, input_size));
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}
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return ErrorOr<void> {};
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}));
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return result;
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}
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}
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