mirror of
https://github.com/RGBCube/serenity
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6f433c8656
This is a monster patch that turns all EventTargets into GC-allocated PlatformObjects. Their C++ wrapper classes are removed, and the LibJS garbage collector is now responsible for their lifetimes. There's a fair amount of hacks and band-aids in this patch, and we'll have a lot of cleanup to do after this.
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Utf8View.h>
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/DOM/Position.h>
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#include <LibWeb/DOM/Text.h>
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namespace Web::DOM {
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Position::Position(Node& node, unsigned offset)
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: m_node(JS::make_handle(node))
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, m_offset(offset)
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{
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}
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String Position::to_string() const
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{
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if (!node())
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return String::formatted("DOM::Position(nullptr, {})", offset());
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return String::formatted("DOM::Position({} ({})), {})", node()->node_name(), node(), offset());
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}
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bool Position::increment_offset()
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{
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if (!is<DOM::Text>(*m_node))
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return false;
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auto& node = verify_cast<DOM::Text>(*m_node);
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auto text = Utf8View(node.data());
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for (auto iterator = text.begin(); !iterator.done(); ++iterator) {
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if (text.byte_offset_of(iterator) >= m_offset) {
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// NOTE: If the current offset is inside a multi-byte code point, it will be moved to the start of the next code point.
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m_offset = text.byte_offset_of(++iterator);
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return true;
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}
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}
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// NOTE: Already at end of current node.
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return false;
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}
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bool Position::decrement_offset()
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{
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if (m_offset == 0 || !is<DOM::Text>(*m_node))
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return false;
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auto& node = verify_cast<DOM::Text>(*m_node);
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auto text = Utf8View(node.data());
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size_t last_smaller_offset = 0;
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for (auto iterator = text.begin(); !iterator.done(); ++iterator) {
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auto byte_offset = text.byte_offset_of(iterator);
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if (byte_offset >= m_offset) {
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break;
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}
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last_smaller_offset = text.byte_offset_of(iterator);
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}
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// NOTE: If the current offset is inside a multi-byte code point, it will be moved to the start of that code point.
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m_offset = last_smaller_offset;
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return true;
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}
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bool Position::offset_is_at_end_of_node() const
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{
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if (!is<DOM::Text>(*m_node))
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return false;
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auto& node = verify_cast<DOM::Text>(*m_node);
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auto text = node.data();
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return m_offset == text.length();
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}
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}
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