/* * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org> * Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch> * * SPDX-License-Identifier: BSD-2-Clause */ #include <AK/Utf8View.h> #include <LibUnicode/Segmentation.h> #include <LibWeb/DOM/Node.h> #include <LibWeb/DOM/Position.h> #include <LibWeb/DOM/Text.h> namespace Web::DOM { JS_DEFINE_ALLOCATOR(Position); Position::Position(JS::GCPtr<Node> node, unsigned offset) : m_node(node) , m_offset(offset) { } ErrorOr<String> Position::to_string() const { if (!node()) return String::formatted("DOM::Position(nullptr, {})", offset()); return String::formatted("DOM::Position({} ({})), {})", node()->node_name(), node().ptr(), offset()); } bool Position::increment_offset() { if (!is<DOM::Text>(*m_node)) return false; auto& node = verify_cast<DOM::Text>(*m_node); auto text = Utf8View(node.data()); if (auto offset = Unicode::next_grapheme_segmentation_boundary(text, m_offset); offset.has_value()) { m_offset = *offset; return true; } // NOTE: Already at end of current node. return false; } bool Position::decrement_offset() { if (!is<DOM::Text>(*m_node)) return false; auto& node = verify_cast<DOM::Text>(*m_node); auto text = Utf8View(node.data()); if (auto offset = Unicode::previous_grapheme_segmentation_boundary(text, m_offset); offset.has_value()) { m_offset = *offset; return true; } // NOTE: Already at beginning of current node. return false; } bool Position::offset_is_at_end_of_node() const { if (!is<DOM::Text>(*m_node)) return false; auto& node = verify_cast<DOM::Text>(*m_node); auto text = node.data(); return m_offset == text.bytes_as_string_view().length(); } }