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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/String.h>
#include <AK/StringView.h>
namespace AK {
StringView::StringView(const String& string)
: m_impl(string.impl())
, m_characters(string.characters())
, m_length(string.length())
{
}
StringView::StringView(const ByteBuffer& buffer)
: m_characters((const char*)buffer.data())
, m_length((size_t)buffer.size())
{
}
Vector<StringView> StringView::split_view(const char separator, bool keep_empty) const
{
if (is_empty())
return {};
Vector<StringView> v;
size_t substart = 0;
for (size_t i = 0; i < length(); ++i) {
char ch = characters_without_null_termination()[i];
if (ch == separator) {
size_t sublen = i - substart;
if (sublen != 0 || keep_empty)
v.append(substring_view(substart, sublen));
substart = i + 1;
}
}
size_t taillen = length() - substart;
if (taillen != 0 || keep_empty)
v.append(substring_view(substart, taillen));
return v;
}
Vector<StringView> StringView::lines(bool consider_cr) const
{
if (is_empty())
return {};
if (!consider_cr)
return split_view('\n', true);
Vector<StringView> v;
size_t substart = 0;
bool last_ch_was_cr = false;
bool split_view = false;
for (size_t i = 0; i < length(); ++i) {
char ch = characters_without_null_termination()[i];
if (ch == '\n') {
split_view = true;
if (last_ch_was_cr) {
substart = i + 1;
split_view = false;
last_ch_was_cr = false;
}
}
if (ch == '\r') {
split_view = true;
last_ch_was_cr = true;
}
if (split_view) {
size_t sublen = i - substart;
v.append(substring_view(substart, sublen));
substart = i + 1;
}
split_view = false;
}
size_t taillen = length() - substart;
if (taillen != 0)
v.append(substring_view(substart, taillen));
return v;
}
bool StringView::starts_with(const StringView& str) const
{
if (str.is_empty())
return true;
if (is_empty())
return false;
if (str.length() > length())
return false;
if (characters_without_null_termination() == str.characters_without_null_termination())
return true;
return !memcmp(characters_without_null_termination(), str.characters_without_null_termination(), str.length());
}
bool StringView::ends_with(const StringView& str) const
{
if (str.is_empty())
return true;
if (is_empty())
return false;
if (str.length() > length())
return false;
return !memcmp(characters_without_null_termination() + length() - str.length(), str.characters_without_null_termination(), str.length());
}
StringView StringView::substring_view(size_t start, size_t length) const
{
ASSERT(start + length <= m_length);
return { m_characters + start, length };
}
StringView StringView::substring_view_starting_from_substring(const StringView& substring) const
{
const char* remaining_characters = substring.characters_without_null_termination();
ASSERT(remaining_characters >= m_characters);
ASSERT(remaining_characters <= m_characters + m_length);
size_t remaining_length = m_length - (remaining_characters - m_characters);
return { remaining_characters, remaining_length };
}
StringView StringView::substring_view_starting_after_substring(const StringView& substring) const
{
const char* remaining_characters = substring.characters_without_null_termination() + substring.length();
ASSERT(remaining_characters >= m_characters);
ASSERT(remaining_characters <= m_characters + m_length);
size_t remaining_length = m_length - (remaining_characters - m_characters);
return { remaining_characters, remaining_length };
}
int StringView::to_int(bool& ok) const
{
bool negative = false;
int value = 0;
size_t i = 0;
if (is_empty()) {
ok = false;
return 0;
}
if (characters_without_null_termination()[0] == '-') {
i++;
negative = true;
}
for (; i < length(); i++) {
if (characters_without_null_termination()[i] < '0' || characters_without_null_termination()[i] > '9') {
ok = false;
return 0;
}
value = value * 10;
value += characters_without_null_termination()[i] - '0';
}
ok = true;
return negative ? -value : value;
}
unsigned StringView::to_uint(bool& ok) const
{
unsigned value = 0;
for (size_t i = 0; i < length(); ++i) {
if (characters_without_null_termination()[i] < '0' || characters_without_null_termination()[i] > '9') {
ok = false;
return 0;
}
value = value * 10;
value += characters_without_null_termination()[i] - '0';
}
ok = true;
return value;
}
unsigned StringView::hash() const
{
if (is_empty())
return 0;
if (m_impl)
return m_impl->hash();
return string_hash(characters_without_null_termination(), length());
}
}
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