chromium/third_party/blink/renderer/core/css/check_pseudo_has_argument_context.cc

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/core/css/check_pseudo_has_argument_context.h"

#include "third_party/blink/renderer/core/css/check_pseudo_has_fast_reject_filter.h"
#include "third_party/blink/renderer/core/css/css_selector_list.h"
#include "third_party/blink/renderer/core/dom/element_traversal.h"

namespace blink {

namespace {

// Iterator class for the compound selectors in the :has() argument selector.
// During iteration, this class collects :has() pseudo class argument
// hashes for fast rejection and provides current compound information.
class CheckPseudoHasArgumentCompoundIterator { … };

CheckPseudoHasArgumentCompoundIterator::CheckPseudoHasArgumentCompoundIterator(
    const CSSSelector* compound,
    Vector<unsigned>& pseudo_has_argument_hashes)
    : … { … }

// Collect sibling relationship within a simple selector in ':has()' argument.
//
// In most cases, a simple selector doesn't have any sibling relationships
// in it. (.e.g. 'div', '.item', ':hover')
// But it can have implicit sibling relationships if it is a child indexed
// pseudo class or a logical combination pseudo class containing a complex
// selector.
// - :nth-child(3) : An element that matches this selector has relationships
//                   with its siblings since the match result can be affected
//                   by sibling existence.
// - :is(.a ~ .b) : An element that matches this selector has relationships
//                  with its siblings since the match result can be affected
//                  by siblings' class values.
// - :is(.a ~ .b .c) : An element that matches this selector has relationships
//                     with its ancestors' siblings since the match result can
//                     be affected by ancestors' siblings' class values.
//
// static
void CheckPseudoHasArgumentCompoundIterator::
    CollectAffectedByFlagsFromSimpleSelector(const CSSSelector* simple_selector,
                                             AffectedByFlags& affected_by) { … }

void CheckPseudoHasArgumentCompoundIterator::operator++() { … }

}  // namespace

CheckPseudoHasArgumentContext::CheckPseudoHasArgumentContext(
    const CSSSelector* selector)
    : … { … }

CheckPseudoHasArgumentTraversalIterator::
    CheckPseudoHasArgumentTraversalIterator(
        Element& has_anchor_element,
        CheckPseudoHasArgumentContext& context)
    : … { … }

Element* CheckPseudoHasArgumentTraversalIterator::LastWithin(Element* element) { … }

void CheckPseudoHasArgumentTraversalIterator::operator++() { … }

}  // namespace blink