text: /*
   * 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 <LibWeb/DOM/Document.h>
  #include <LibWeb/DOM/ParentNode.h>
  #include <LibWeb/Layout/LayoutNode.h>
  #include <LibWeb/Layout/LayoutTable.h>
  #include <LibWeb/Layout/LayoutText.h>
  #include <LibWeb/Layout/LayoutTreeBuilder.h>
  
  namespace Web {
  
  LayoutTreeBuilder::LayoutTreeBuilder()
  {
  }
  
  static RefPtr<LayoutNode> create_layout_tree(Node& node, const StyleProperties* parent_style)
  {
      auto layout_node = node.create_layout_node(parent_style);
      if (!layout_node)
          return nullptr;
  
      if (!node.has_children())
          return layout_node;
  
      NonnullRefPtrVector<LayoutNode> layout_children;
      bool have_inline_children = false;
      bool have_noninline_children = false;
  
      to<ParentNode>(node).for_each_child([&](Node& child) {
          auto layout_child = create_layout_tree(child, &layout_node->style());
          if (!layout_child)
              return;
          if (layout_child->is_inline())
              have_inline_children = true;
          else
              have_noninline_children = true;
          layout_children.append(layout_child.release_nonnull());
      });
  
      for (auto& layout_child : layout_children) {
          if (have_noninline_children && have_inline_children && layout_child.is_inline()) {
              if (is<LayoutText>(layout_child) && to<LayoutText>(layout_child).text_for_style(*parent_style) == " ")
                  continue;
              layout_node->inline_wrapper().append_child(layout_child);
          } else {
              layout_node->append_child(layout_child);
          }
      }
  
      if (have_inline_children && !have_noninline_children)
          layout_node->set_children_are_inline(true);
  
      return layout_node;
  }
  
  RefPtr<LayoutNode> LayoutTreeBuilder::build(Node& node)
  {
      // FIXME: Support building partial trees.
      ASSERT(is<Document>(node) || !node.has_children());
      return create_layout_tree(node, nullptr);
  }
  
  }
  