chromium/src/third_party/blink/renderer/core/css/resolver/style_builder.cc

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc.
 * All rights reserved.
 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
 * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
 * (http://www.torchmobile.com/)
 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * 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
 * OWNER 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,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <memory>
#include <utility>

#include "third_party/blink/renderer/core/animation/css/css_animations.h"
#include "third_party/blink/renderer/core/css/css_property_name.h"
#include "third_party/blink/renderer/core/css/properties/css_property_ref.h"
#include "third_party/blink/renderer/core/css/properties/longhand.h"
#include "third_party/blink/renderer/core/css/properties/longhands/variable.h"
#include "third_party/blink/renderer/core/css/resolver/style_builder.h"
#include "third_party/blink/renderer/core/css/resolver/style_resolver_state.h"
#include "third_party/blink/renderer/core/css/scoped_css_value.h"
#include "third_party/blink/renderer/core/style/computed_style.h"

namespace blink {

void StyleBuilder::ApplyProperty(const CSSPropertyName& name,
                                 StyleResolverState& state,
                                 const ScopedCSSValue& scoped_value) {
  CSSPropertyRef ref(name, state.GetDocument());
  DCHECK(ref.IsValid());

  ApplyProperty(ref.GetProperty(), state, scoped_value);
}

void StyleBuilder::ApplyProperty(const CSSProperty& property,
                                 StyleResolverState& state,
                                 const ScopedCSSValue& scoped_value) {
  DCHECK(!Variable::IsStaticInstance(property))
      << "Please use a CustomProperty instance to apply custom properties";

  CSSPropertyID id = property.PropertyID();
  bool is_inherited = property.IsInherited();
  const CSSValue& value = scoped_value.GetCSSValue();

  // These values must be resolved by StyleCascade before application:
  DCHECK(!value.IsVariableReferenceValue());
  DCHECK(!value.IsPendingSubstitutionValue());

  DCHECK(!property.IsShorthand())
      << "Shorthand property id = " << static_cast<int>(id)
      << " wasn't expanded at parsing time";

  bool is_inherit = state.ParentNode() && value.IsInheritedValue();
  bool is_initial = value.IsInitialValue() ||
                    (!state.ParentNode() && value.IsInheritedValue());

  // isInherit => !isInitial && isInitial => !isInherit
  DCHECK(!is_inherit || !is_initial);
  // isInherit => (state.parentNode() && state.parentStyle())
  DCHECK(!is_inherit || (state.ParentNode() && state.ParentStyle()));

  if (is_inherit && !is_inherited) {
    state.Style()->SetHasExplicitInheritance();
    state.ParentStyle()->SetChildHasExplicitInheritance();
  } else if (value.IsUnsetValue()) {
    DCHECK(!is_inherit && !is_initial);
    if (is_inherited)
      is_inherit = true;
    else
      is_initial = true;
  }

  if (is_initial)
    To<Longhand>(property).ApplyInitial(state);
  else if (is_inherit)
    To<Longhand>(property).ApplyInherit(state);
  else
    To<Longhand>(property).ApplyValue(state, scoped_value);
}

}  // namespace blink