mirror of
https://github.com/LadybirdBrowser/ladybird.git
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f23b55ae86
This allows us to pass the new String type to functions that take a StringView directly, having to call bytes_as_string_view() every time gets old quickly.
299 lines
8.6 KiB
C++
299 lines
8.6 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/AnyOf.h>
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#include <AK/ByteBuffer.h>
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#include <AK/Find.h>
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#include <AK/Function.h>
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#include <AK/Memory.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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#ifndef KERNEL
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# include <AK/DeprecatedString.h>
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# include <AK/FlyString.h>
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# include <AK/String.h>
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#endif
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namespace AK {
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#ifndef KERNEL
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StringView::StringView(String const& string)
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: m_characters(reinterpret_cast<char const*>(string.bytes().data()))
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, m_length(string.bytes().size())
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{
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}
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StringView::StringView(DeprecatedString const& string)
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: m_characters(string.characters())
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, m_length(string.length())
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{
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}
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StringView::StringView(FlyString const& string)
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: m_characters(string.characters())
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, m_length(string.length())
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{
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}
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#endif
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StringView::StringView(ByteBuffer const& buffer)
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: m_characters((char const*)buffer.data())
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, m_length(buffer.size())
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{
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}
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Vector<StringView> StringView::split_view(char const separator, SplitBehavior split_behavior) const
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{
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StringView seperator_view { &separator, 1 };
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return split_view(seperator_view, split_behavior);
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}
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Vector<StringView> StringView::split_view(StringView separator, SplitBehavior split_behavior) const
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{
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Vector<StringView> parts;
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for_each_split_view(separator, split_behavior, [&](StringView view) {
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parts.append(view);
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});
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return parts;
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}
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Vector<StringView> StringView::lines(bool consider_cr) const
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{
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if (is_empty())
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return {};
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if (!consider_cr)
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return split_view('\n', SplitBehavior::KeepEmpty);
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Vector<StringView> v;
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size_t substart = 0;
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bool last_ch_was_cr = false;
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bool split_view = false;
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for (size_t i = 0; i < length(); ++i) {
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char ch = characters_without_null_termination()[i];
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if (ch == '\n') {
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split_view = true;
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if (last_ch_was_cr) {
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substart = i + 1;
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split_view = false;
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}
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}
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if (ch == '\r') {
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split_view = true;
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last_ch_was_cr = true;
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} else {
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last_ch_was_cr = false;
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}
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if (split_view) {
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size_t sublen = i - substart;
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v.append(substring_view(substart, sublen));
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substart = i + 1;
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}
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split_view = false;
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}
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size_t taillen = length() - substart;
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if (taillen != 0)
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v.append(substring_view(substart, taillen));
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return v;
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}
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bool StringView::starts_with(char ch) const
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{
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if (is_empty())
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return false;
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return ch == characters_without_null_termination()[0];
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}
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bool StringView::starts_with(StringView str, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::starts_with(*this, str, case_sensitivity);
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}
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bool StringView::ends_with(char ch) const
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{
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if (is_empty())
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return false;
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return ch == characters_without_null_termination()[length() - 1];
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}
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bool StringView::ends_with(StringView str, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::ends_with(*this, str, case_sensitivity);
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}
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bool StringView::matches(StringView mask, Vector<MaskSpan>& mask_spans, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::matches(*this, mask, case_sensitivity, &mask_spans);
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}
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bool StringView::matches(StringView mask, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::matches(*this, mask, case_sensitivity);
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}
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bool StringView::contains(char needle) const
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{
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for (char current : *this) {
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if (current == needle)
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return true;
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}
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return false;
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}
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bool StringView::contains(u32 needle) const
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{
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// A code point should be at most four UTF-8 bytes, which easily fits into StringBuilder's inline-buffer.
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// Therefore, this will not allocate.
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StringBuilder needle_builder;
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auto result = needle_builder.try_append_code_point(needle);
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if (result.is_error()) {
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// The needle is invalid, therefore the string does not contain it.
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return false;
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}
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return contains(needle_builder.string_view());
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}
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bool StringView::contains(StringView needle, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::contains(*this, needle, case_sensitivity);
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}
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bool StringView::equals_ignoring_case(StringView other) const
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{
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return StringUtils::equals_ignoring_case(*this, other);
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}
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#ifndef KERNEL
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DeprecatedString StringView::to_lowercase_string() const
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{
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return StringImpl::create_lowercased(characters_without_null_termination(), length());
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}
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DeprecatedString StringView::to_uppercase_string() const
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{
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return StringImpl::create_uppercased(characters_without_null_termination(), length());
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}
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DeprecatedString StringView::to_titlecase_string() const
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{
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return StringUtils::to_titlecase(*this);
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}
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#endif
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StringView StringView::substring_view_starting_from_substring(StringView substring) const
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{
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char const* remaining_characters = substring.characters_without_null_termination();
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VERIFY(remaining_characters >= m_characters);
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VERIFY(remaining_characters <= m_characters + m_length);
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size_t remaining_length = m_length - (remaining_characters - m_characters);
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return { remaining_characters, remaining_length };
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}
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StringView StringView::substring_view_starting_after_substring(StringView substring) const
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{
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char const* remaining_characters = substring.characters_without_null_termination() + substring.length();
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VERIFY(remaining_characters >= m_characters);
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VERIFY(remaining_characters <= m_characters + m_length);
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size_t remaining_length = m_length - (remaining_characters - m_characters);
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return { remaining_characters, remaining_length };
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}
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bool StringView::copy_characters_to_buffer(char* buffer, size_t buffer_size) const
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{
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// We must fit at least the NUL-terminator.
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VERIFY(buffer_size > 0);
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size_t characters_to_copy = min(m_length, buffer_size - 1);
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__builtin_memcpy(buffer, m_characters, characters_to_copy);
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buffer[characters_to_copy] = 0;
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return characters_to_copy == m_length;
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}
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template<typename T>
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Optional<T> StringView::to_int() const
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{
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return StringUtils::convert_to_int<T>(*this);
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}
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template Optional<i8> StringView::to_int() const;
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template Optional<i16> StringView::to_int() const;
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template Optional<i32> StringView::to_int() const;
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template Optional<long> StringView::to_int() const;
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template Optional<long long> StringView::to_int() const;
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template<typename T>
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Optional<T> StringView::to_uint() const
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{
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return StringUtils::convert_to_uint<T>(*this);
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}
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template Optional<u8> StringView::to_uint() const;
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template Optional<u16> StringView::to_uint() const;
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template Optional<u32> StringView::to_uint() const;
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template Optional<unsigned long> StringView::to_uint() const;
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template Optional<unsigned long long> StringView::to_uint() const;
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template Optional<long> StringView::to_uint() const;
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template Optional<long long> StringView::to_uint() const;
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#ifndef KERNEL
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Optional<double> StringView::to_double(TrimWhitespace trim_whitespace) const
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{
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return StringUtils::convert_to_floating_point<double>(*this, trim_whitespace);
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}
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Optional<float> StringView::to_float(TrimWhitespace trim_whitespace) const
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{
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return StringUtils::convert_to_floating_point<float>(*this, trim_whitespace);
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}
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bool StringView::operator==(DeprecatedString const& string) const
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{
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return *this == string.view();
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}
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DeprecatedString StringView::to_deprecated_string() const { return DeprecatedString { *this }; }
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DeprecatedString StringView::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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#endif
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Vector<size_t> StringView::find_all(StringView needle) const
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{
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return StringUtils::find_all(*this, needle);
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}
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Vector<StringView> StringView::split_view_if(Function<bool(char)> const& predicate, SplitBehavior split_behavior) const
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{
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if (is_empty())
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return {};
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Vector<StringView> v;
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size_t substart = 0;
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bool keep_empty = has_flag(split_behavior, SplitBehavior::KeepEmpty);
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bool keep_separator = has_flag(split_behavior, SplitBehavior::KeepTrailingSeparator);
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for (size_t i = 0; i < length(); ++i) {
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char ch = characters_without_null_termination()[i];
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if (predicate(ch)) {
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size_t sublen = i - substart;
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if (sublen != 0 || keep_empty)
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v.append(substring_view(substart, keep_separator ? sublen + 1 : sublen));
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substart = i + 1;
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}
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}
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size_t taillen = length() - substart;
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if (taillen != 0 || keep_empty)
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v.append(substring_view(substart, taillen));
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return v;
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}
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}
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