third_party/blink/renderer/core/html/html_table_rows_collection.cc

/*
 * Copyright (C) 2008, 2011, 2012, 2014 Apple Inc. All rights reserved.
 *
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 *     notice, this list of conditions and the following disclaimer.
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 *     notice, this list of conditions and the following disclaimer in the
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
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#include "third_party/blink/renderer/core/html/html_table_rows_collection.h"

#include "third_party/blink/renderer/core/dom/element_traversal.h"
#include "third_party/blink/renderer/core/html/html_table_element.h"
#include "third_party/blink/renderer/core/html/html_table_row_element.h"
#include "third_party/blink/renderer/core/html_names.h"

namespace blink {

using namespace html_names;

static inline bool IsInSection(HTMLTableRowElement& row,
                               const HTMLQualifiedName& section_tag) {
  // Because we know that the parent is a table or a section, it's safe to cast
  // it to an HTMLElement giving us access to the faster hasTagName overload
  // from that class.
  return ToHTMLElement(row.parentNode())->HasTagName(section_tag);
}

HTMLTableRowElement* HTMLTableRowsCollection::RowAfter(
    HTMLTableElement& table,
    HTMLTableRowElement* previous) {
  // Start by looking for the next row in this section.
  // Continue only if there is none.
  if (previous && previous->parentNode() != table) {
    if (HTMLTableRowElement* row =
            Traversal<HTMLTableRowElement>::NextSibling(*previous))
      return row;
  }

  // If still looking at head sections, find the first row in the next head
  // section.
  HTMLElement* child = nullptr;
  if (!previous)
    child = Traversal<HTMLElement>::FirstChild(table);
  else if (IsInSection(*previous, kTheadTag))
    child = Traversal<HTMLElement>::NextSibling(*previous->parentNode());
  for (; child; child = Traversal<HTMLElement>::NextSibling(*child)) {
    if (child->HasTagName(kTheadTag)) {
      if (HTMLTableRowElement* row =
              Traversal<HTMLTableRowElement>::FirstChild(*child))
        return row;
    }
  }

  // If still looking at top level and bodies, find the next row in top level or
  // the first in the next body section.
  if (!previous || IsInSection(*previous, kTheadTag))
    child = Traversal<HTMLElement>::FirstChild(table);
  else if (previous->parentNode() == table)
    child = Traversal<HTMLElement>::NextSibling(*previous);
  else if (IsInSection(*previous, kTbodyTag))
    child = Traversal<HTMLElement>::NextSibling(*previous->parentNode());
  for (; child; child = Traversal<HTMLElement>::NextSibling(*child)) {
    if (auto* row = ToHTMLTableRowElementOrNull(child))
      return row;
    if (child->HasTagName(kTbodyTag)) {
      if (HTMLTableRowElement* row =
              Traversal<HTMLTableRowElement>::FirstChild(*child))
        return row;
    }
  }

  // Find the first row in the next foot section.
  if (!previous || !IsInSection(*previous, kTfootTag))
    child = Traversal<HTMLElement>::FirstChild(table);
  else
    child = Traversal<HTMLElement>::NextSibling(*previous->parentNode());
  for (; child; child = Traversal<HTMLElement>::NextSibling(*child)) {
    if (child->HasTagName(kTfootTag)) {
      if (HTMLTableRowElement* row =
              Traversal<HTMLTableRowElement>::FirstChild(*child))
        return row;
    }
  }

  return nullptr;
}

HTMLTableRowElement* HTMLTableRowsCollection::LastRow(HTMLTableElement& table) {
  for (HTMLElement* tfoot =
           Traversal<HTMLElement>::LastChild(table, HasHTMLTagName(kTfootTag));
       tfoot; tfoot = Traversal<HTMLElement>::PreviousSibling(
                  *tfoot, HasHTMLTagName(kTfootTag))) {
    if (HTMLTableRowElement* last_row =
            Traversal<HTMLTableRowElement>::LastChild(*tfoot))
      return last_row;
  }

  for (HTMLElement* child = Traversal<HTMLElement>::LastChild(table); child;
       child = Traversal<HTMLElement>::PreviousSibling(*child)) {
    if (auto* row = ToHTMLTableRowElementOrNull(child))
      return row;
    if (child->HasTagName(kTbodyTag)) {
      if (HTMLTableRowElement* last_row =
              Traversal<HTMLTableRowElement>::LastChild(*child))
        return last_row;
    }
  }

  for (HTMLElement* thead =
           Traversal<HTMLElement>::LastChild(table, HasHTMLTagName(kTheadTag));
       thead; thead = Traversal<HTMLElement>::PreviousSibling(
                  *thead, HasHTMLTagName(kTheadTag))) {
    if (HTMLTableRowElement* last_row =
            Traversal<HTMLTableRowElement>::LastChild(*thead))
      return last_row;
  }

  return nullptr;
}

// Must call get() on the table in case that argument is compiled before
// dereferencing the table to get at the collection cache. Order of argument
// evaluation is undefined and can differ between compilers.
HTMLTableRowsCollection::HTMLTableRowsCollection(ContainerNode& table)
    : HTMLCollection(table, kTableRows, kOverridesItemAfter) {
  DCHECK(IsHTMLTableElement(table));
}

HTMLTableRowsCollection* HTMLTableRowsCollection::Create(ContainerNode& table,
                                                         CollectionType type) {
  DCHECK_EQ(type, kTableRows);
  return MakeGarbageCollected<HTMLTableRowsCollection>(table);
}

Element* HTMLTableRowsCollection::VirtualItemAfter(Element* previous) const {
  return RowAfter(ToHTMLTableElement(ownerNode()),
                  ToHTMLTableRowElement(previous));
}

}  // namespace blink