/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* atom list for CSS pseudo-elements */

#include "nsCSSPseudoElements.h"

#include "mozilla/ArrayUtils.h"

#include "nsCSSAnonBoxes.h"

#include "nsDOMString.h"

#include "nsGkAtomConsts.h"

#include "nsStaticAtomUtils.h"

using namespace mozilla;

// Flags data for each of the pseudo-elements.

/* static */ const uint32_t

nsCSSPseudoElements::kPseudoElementFlags[] = {

#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \

  flags_,

#include "nsCSSPseudoElementList.h"

#undef CSS_PSEUDO_ELEMENT

};

static nsStaticAtom*

GetAtomBase()

{

  return const_cast<nsStaticAtom*>(

      nsGkAtoms::GetAtomByIndex(kAtomIndex_PseudoElements));

}

bool

nsCSSPseudoElements::IsPseudoElement(nsAtom* aAtom)

{

  return nsStaticAtomUtils::IsMember(aAtom, GetAtomBase(),

                                     kAtomCount_PseudoElements);

}

/* static */ bool

nsCSSPseudoElements::IsCSS2PseudoElement(nsAtom *aAtom)

{

  // We don't implement this using PseudoElementHasFlags because callers

  // want to pass things that could be anon boxes.

  NS_ASSERTION(nsCSSPseudoElements::IsPseudoElement(aAtom) ||

               nsCSSAnonBoxes::IsAnonBox(aAtom),

               "must be pseudo element or anon box");

  bool result = aAtom == nsCSSPseudoElements::after() ||

                  aAtom == nsCSSPseudoElements::before() ||

                  aAtom == nsCSSPseudoElements::firstLetter() ||

                  aAtom == nsCSSPseudoElements::firstLine();

  NS_ASSERTION(nsCSSAnonBoxes::IsAnonBox(aAtom) ||

               result == PseudoElementHasFlags(

                   GetPseudoType(aAtom, EnabledState::eIgnoreEnabledState),

                   CSS_PSEUDO_ELEMENT_IS_CSS2),

               "result doesn't match flags");

  return result;

}

/* static */ CSSPseudoElementType

nsCSSPseudoElements::GetPseudoType(nsAtom* aAtom, EnabledState aEnabledState)

{

  Maybe<uint32_t> index =

    nsStaticAtomUtils::Lookup(aAtom, GetAtomBase(), kAtomCount_PseudoElements);

  if (index.isSome()) {

    auto type = static_cast<Type>(*index);

    return IsEnabled(type, aEnabledState) ? type : Type::NotPseudo;

  }

  if (nsCSSAnonBoxes::IsAnonBox(aAtom)) {

#ifdef MOZ_XUL

    if (nsCSSAnonBoxes::IsTreePseudoElement(aAtom)) {

      return Type::XULTree;

    }

#endif

    if (nsCSSAnonBoxes::IsNonInheritingAnonBox(aAtom)) {

      return Type::NonInheritingAnonBox;

    }

    return Type::InheritingAnonBox;

  }

  return Type::NotPseudo;

}

/* static */ nsAtom*

nsCSSPseudoElements::GetPseudoAtom(Type aType)

{

  MOZ_ASSERT(aType < Type::Count, "Unexpected type");

  size_t index = kAtomIndex_PseudoElements + static_cast<size_t>(aType);

  return nsGkAtoms::GetAtomByIndex(index);

}

/* static */ already_AddRefed<nsAtom>

nsCSSPseudoElements::GetPseudoAtom(const nsAString& aPseudoElement)

{

  if (DOMStringIsNull(aPseudoElement) || aPseudoElement.IsEmpty() ||

      aPseudoElement.First() != char16_t(':')) {

    return nullptr;

  }

  // deal with two-colon forms of aPseudoElt

  nsAString::const_iterator start, end;

  aPseudoElement.BeginReading(start);

  aPseudoElement.EndReading(end);

  NS_ASSERTION(start != end, "aPseudoElement is not empty!");

  ++start;

  bool haveTwoColons = true;

  if (start == end || *start != char16_t(':')) {

    --start;

    haveTwoColons = false;

  }

  RefPtr<nsAtom> pseudo = NS_Atomize(Substring(start, end));

  MOZ_ASSERT(pseudo);

  // There aren't any non-CSS2 pseudo-elements with a single ':'

  if (!haveTwoColons &&

      (!IsPseudoElement(pseudo) || !IsCSS2PseudoElement(pseudo))) {

    // XXXbz I'd really rather we threw an exception or something, but

    // the DOM spec sucks.

    return nullptr;

  }

  return pseudo.forget();

}

/* static */ bool

nsCSSPseudoElements::PseudoElementSupportsUserActionState(const Type aType)

{

  return PseudoElementHasFlags(aType,

                               CSS_PSEUDO_ELEMENT_SUPPORTS_USER_ACTION_STATE);

}

/* static */ nsString

nsCSSPseudoElements::PseudoTypeAsString(Type aPseudoType)

{

  switch (aPseudoType) {

    case CSSPseudoElementType::before:

      return NS_LITERAL_STRING("::before");

    case CSSPseudoElementType::after:

      return NS_LITERAL_STRING("::after");

    default:

      MOZ_ASSERT(aPseudoType == CSSPseudoElementType::NotPseudo,

                 "Unexpected pseudo type");

      return EmptyString();

  }

}

#ifdef DEBUG

/* static */ void

nsCSSPseudoElements::AssertAtoms()

{

  nsStaticAtom* base = GetAtomBase();

#define CSS_PSEUDO_ELEMENT(name_, value_, flags_)                    \

  {                                                                  \

    RefPtr<nsAtom> atom = NS_Atomize(value_);                        \

    size_t index = static_cast<size_t>(CSSPseudoElementType::name_); \

    MOZ_ASSERT(atom == nsGkAtoms::PseudoElement_##name_,             \

               "Static atom for " #name_ " has incorrect value");    \

    MOZ_ASSERT(atom == &base[index],                                 \

               "Static atom for " #name_ " not at expected index");  \

  }

#include "nsCSSPseudoElementList.h"

#undef CSS_PSEUDO_ELEMENT

}

#endif