ecf2cc600b
This implementation is based on the same feature I added to Serenity's TextEditor: https://github.com/SerenityOS/serenity/pull/17477
134 lines
3.2 KiB
C++
134 lines
3.2 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 <LibUnicode/CharacterTypes.h>
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#include <LibUnicode/Segmenter.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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JS_DEFINE_ALLOCATOR(Position);
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Position::Position(JS::GCPtr<Node> node, unsigned offset)
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: m_node(node)
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, m_offset(offset)
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{
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}
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void Position::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_node);
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}
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ErrorOr<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().ptr(), 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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if (auto offset = node.grapheme_segmenter().next_boundary(m_offset); offset.has_value()) {
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m_offset = *offset;
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return true;
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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 (!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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if (auto offset = node.grapheme_segmenter().previous_boundary(m_offset); offset.has_value()) {
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m_offset = *offset;
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return true;
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}
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// NOTE: Already at beginning of current node.
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return false;
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}
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static bool should_continue_beyond_word(Utf8View const& word)
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{
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for (auto code_point : word) {
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if (!Unicode::code_point_has_punctuation_general_category(code_point) && !Unicode::code_point_has_separator_general_category(code_point))
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return false;
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}
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return true;
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}
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bool Position::increment_offset_to_next_word()
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{
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if (!is<DOM::Text>(*m_node) || offset_is_at_end_of_node())
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return false;
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auto& node = static_cast<DOM::Text&>(*m_node);
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while (true) {
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if (auto offset = node.word_segmenter().next_boundary(m_offset); offset.has_value()) {
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auto word = node.data().code_points().substring_view(m_offset, *offset - m_offset);
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m_offset = *offset;
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if (should_continue_beyond_word(word))
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continue;
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}
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break;
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}
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return true;
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}
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bool Position::decrement_offset_to_previous_word()
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{
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if (!is<DOM::Text>(*m_node) || m_offset == 0)
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return false;
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auto& node = static_cast<DOM::Text&>(*m_node);
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while (true) {
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if (auto offset = node.word_segmenter().previous_boundary(m_offset); offset.has_value()) {
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auto word = node.data().code_points().substring_view(*offset, m_offset - *offset);
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m_offset = *offset;
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if (should_continue_beyond_word(word))
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continue;
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}
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break;
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}
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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.bytes_as_string_view().length();
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}
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}
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