mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 07:30:19 +00:00
1febee768d
As suggested by @awesomekling in a code review and (initially) ignored by me :^) Implementation is roughly based on LibJS's trim_string(), but with a fix for trimming all-whitespace strings.
491 lines
12 KiB
C++
491 lines
12 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/FlyString.h>
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#include <AK/Memory.h>
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#include <AK/StdLibExtras.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/Vector.h>
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#ifndef KERNEL
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# include <inttypes.h>
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#endif
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#ifdef KERNEL
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extern "C" char* strstr(const char* haystack, const char* needle);
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#endif
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namespace AK {
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String::String(const StringView& view)
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{
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if (view.m_impl)
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m_impl = *view.m_impl;
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else
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m_impl = StringImpl::create(view.characters_without_null_termination(), view.length());
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}
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bool String::operator==(const FlyString& fly_string) const
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{
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return *this == String(fly_string.impl());
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}
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bool String::operator==(const String& other) const
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{
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if (!m_impl)
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return !other.m_impl;
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if (!other.m_impl)
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return false;
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if (length() != other.length())
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return false;
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return !memcmp(characters(), other.characters(), length());
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}
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bool String::operator==(const StringView& other) const
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{
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if (!m_impl)
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return !other.m_characters;
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if (!other.m_characters)
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return false;
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if (length() != other.length())
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return false;
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return !memcmp(characters(), other.characters_without_null_termination(), length());
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}
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bool String::operator<(const String& other) const
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{
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if (!m_impl)
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return other.m_impl;
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if (!other.m_impl)
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return false;
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return strcmp(characters(), other.characters()) < 0;
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}
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bool String::operator>(const String& other) const
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{
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if (!m_impl)
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return other.m_impl;
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if (!other.m_impl)
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return false;
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return strcmp(characters(), other.characters()) > 0;
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}
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String String::empty()
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{
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return StringImpl::the_empty_stringimpl();
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}
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String String::isolated_copy() const
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{
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if (!m_impl)
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return {};
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if (!m_impl->length())
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return empty();
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char* buffer;
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auto impl = StringImpl::create_uninitialized(length(), buffer);
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memcpy(buffer, m_impl->characters(), m_impl->length());
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return String(move(*impl));
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}
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String String::substring(size_t start, size_t length) const
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{
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if (!length)
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return {};
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ASSERT(m_impl);
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ASSERT(start + length <= m_impl->length());
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// FIXME: This needs some input bounds checking.
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return { characters() + start, length };
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}
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StringView String::substring_view(size_t start, size_t length) const
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{
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ASSERT(m_impl);
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ASSERT(start + length <= m_impl->length());
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// FIXME: This needs some input bounds checking.
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return { characters() + start, length };
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}
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Vector<String> String::split(char separator, bool keep_empty) const
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{
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return split_limit(separator, 0, keep_empty);
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}
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Vector<String> String::split_limit(char separator, size_t limit, bool keep_empty) const
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{
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if (is_empty())
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return {};
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Vector<String> v;
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size_t substart = 0;
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for (size_t i = 0; i < length() && (v.size() + 1) != limit; ++i) {
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char ch = characters()[i];
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if (ch == separator) {
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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(substart, 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(substart, taillen));
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return v;
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}
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Vector<StringView> String::split_view(const char separator, bool keep_empty) 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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for (size_t i = 0; i < length(); ++i) {
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char ch = characters()[i];
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if (ch == separator) {
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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, 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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ByteBuffer String::to_byte_buffer() const
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{
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if (!m_impl)
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return nullptr;
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return ByteBuffer::copy(reinterpret_cast<const u8*>(characters()), length());
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}
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int String::to_int(bool& ok) const
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{
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return StringUtils::convert_to_int(this->view(), ok);
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}
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unsigned String::to_uint(bool& ok) const
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{
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return StringUtils::convert_to_uint(this->view(), ok);
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}
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String String::number(unsigned long long value)
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{
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int size;
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char buffer[32];
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size = sprintf(buffer, "%llu", value);
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return String(buffer, size);
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}
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String String::number(unsigned long value)
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{
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int size;
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char buffer[32];
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size = sprintf(buffer, "%lu", value);
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return String(buffer, size);
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}
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String String::number(unsigned value)
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{
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char buffer[32];
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int size = sprintf(buffer, "%u", value);
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return String(buffer, size);
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}
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String String::number(long long value)
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{
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char buffer[32];
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int size = sprintf(buffer, "%lld", value);
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return String(buffer, size);
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}
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String String::number(long value)
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{
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char buffer[32];
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int size = sprintf(buffer, "%ld", value);
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return String(buffer, size);
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}
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String String::number(int value)
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{
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char buffer[32];
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int size = sprintf(buffer, "%d", value);
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return String(buffer, size);
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}
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String String::format(const char* fmt, ...)
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{
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StringBuilder builder;
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va_list ap;
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va_start(ap, fmt);
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builder.appendvf(fmt, ap);
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va_end(ap);
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return builder.to_string();
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}
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bool String::starts_with(const StringView& str) const
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{
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if (str.is_empty())
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return true;
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if (is_empty())
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return false;
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if (str.length() > length())
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return false;
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return !memcmp(characters(), str.characters_without_null_termination(), str.length());
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}
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bool String::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 characters()[0] == ch;
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}
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bool String::ends_with(const StringView& str) const
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{
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if (str.is_empty())
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return true;
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if (is_empty())
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return false;
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if (str.length() > length())
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return false;
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return !memcmp(characters() + (length() - str.length()), str.characters_without_null_termination(), str.length());
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}
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bool String::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 characters()[length() - 1] == ch;
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}
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String String::repeated(char ch, size_t count)
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{
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if (!count)
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return empty();
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char* buffer;
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auto impl = StringImpl::create_uninitialized(count, buffer);
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memset(buffer, ch, count);
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return *impl;
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}
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bool String::matches(const 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 String::contains(const String& needle) const
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{
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if (is_null() || needle.is_null())
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return false;
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return strstr(characters(), needle.characters());
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}
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Optional<size_t> String::index_of(const String& needle) const
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{
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if (is_null() || needle.is_null())
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return {};
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const char* self_characters = characters();
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const char* result = strstr(self_characters, needle.characters());
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if (!result)
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return {};
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return Optional<size_t> { result - self_characters };
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}
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bool String::equals_ignoring_case(const StringView& other) const
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{
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return StringUtils::equals_ignoring_case(view(), other);
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}
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int String::replace(const String& needle, const String& replacement, bool all_occurences)
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{
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if (is_empty())
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return 0;
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Vector<size_t> positions;
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size_t start = 0, pos;
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for (;;) {
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const char* ptr = strstr(characters() + start, needle.characters());
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if (!ptr)
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break;
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pos = ptr - characters();
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positions.append(pos);
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if (!all_occurences)
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break;
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start = pos + 1;
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}
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if (!positions.size())
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return 0;
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StringBuilder b;
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size_t lastpos = 0;
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for (auto& pos : positions) {
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b.append(substring_view(lastpos, pos - lastpos));
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b.append(replacement);
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lastpos = pos + needle.length();
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}
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b.append(substring_view(lastpos, length() - lastpos));
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m_impl = StringImpl::create(b.build().characters());
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return positions.size();
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}
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String String::trim_whitespace(TrimMode mode) const
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{
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auto is_whitespace_character = [](char ch) -> bool {
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return ch == '\t'
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|| ch == '\n'
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|| ch == '\v'
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|| ch == '\f'
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|| ch == '\r'
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|| ch == ' ';
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};
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size_t substring_start = 0;
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size_t substring_length = length();
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if (mode == TrimMode::Left || mode == TrimMode::Both) {
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for (size_t i = 0; i < length(); ++i) {
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if (substring_length == 0)
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return "";
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if (!is_whitespace_character(characters()[i]))
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break;
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++substring_start;
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--substring_length;
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}
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}
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if (mode == TrimMode::Right || mode == TrimMode::Both) {
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for (size_t i = length() - 1; i > 0; --i) {
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if (substring_length == 0)
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return "";
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if (!is_whitespace_character(characters()[i]))
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break;
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--substring_length;
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}
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}
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return substring(substring_start, substring_length);
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}
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String escape_html_entities(const StringView& html)
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{
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StringBuilder builder;
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for (size_t i = 0; i < html.length(); ++i) {
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if (html[i] == '<')
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builder.append("<");
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else if (html[i] == '>')
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builder.append(">");
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else if (html[i] == '&')
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builder.append("&");
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else
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builder.append(html[i]);
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}
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return builder.to_string();
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}
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String::String(const FlyString& string)
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: m_impl(string.impl())
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{
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}
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String String::to_lowercase() const
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{
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if (!m_impl)
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return {};
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return m_impl->to_lowercase();
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}
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String String::to_uppercase() const
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{
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if (!m_impl)
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return {};
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return m_impl->to_uppercase();
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}
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bool operator<(const char* characters, const String& string)
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{
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if (!characters)
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return !string.is_null();
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if (string.is_null())
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return false;
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return __builtin_strcmp(characters, string.characters()) < 0;
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}
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bool operator>=(const char* characters, const String& string)
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{
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return !(characters < string);
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}
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bool operator>(const char* characters, const String& string)
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{
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if (!characters)
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return !string.is_null();
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if (string.is_null())
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return false;
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return __builtin_strcmp(characters, string.characters()) > 0;
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}
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bool operator<=(const char* characters, const String& string)
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{
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return !(characters > string);
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}
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bool String::operator==(const char* cstring) const
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{
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if (is_null())
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return !cstring;
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if (!cstring)
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return false;
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return !__builtin_strcmp(characters(), cstring);
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}
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StringView String::view() const
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{
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return { characters(), length() };
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}
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}
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