match_request.h | Explore in Territory

/*
 * Copyright (C) 1999 Lars Knoll ([email protected])
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
 * All rights reserved.
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_RESOLVER_MATCH_REQUEST_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_RESOLVER_MATCH_REQUEST_H_

#include "base/check_op.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/css/rule_set.h"

namespace blink {

class ContainerNode;

// Encapsulates the context for matching against a group of style sheets
// by ElementRuleCollector. Carries the RuleSet, scope (a ContainerNode) and
// CSSStyleSheet.
//
// We allow up to 32 style sheets in a group. More than one allows us to
// amortize checks on the element between style sheets (e.g. fetching its
// parents, or lowercasing attributes), but having an arbitrary number of them
// (ie., using a Vector or HeapVector) would require us to either make the
// MatchRequest garbage-collected (with associated extra heap allocations),
// or lock down the rule sets using Persistent<>, which is also costly.
// This, we choose an in-between solution of grouping the stylesheet
// into bounded blocks; you can check with IsFull().
//
// All style sheets have an index, which are assumed to be consecutive.
class CORE_EXPORT MatchRequest { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_RESOLVER_MATCH_REQUEST_H_
chromium/third_party/blink/renderer/core/css/resolver/match_request.h
