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// Copyright 2019 The Chromium Authors. All rights reserved.
// 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/page/scrolling/fragment_anchor.h"
#include "base/metrics/histogram_macros.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/core/html/html_document.h"
#include "third_party/blink/renderer/core/page/scrolling/element_fragment_anchor.h"
#include "third_party/blink/renderer/core/page/scrolling/text_fragment_anchor.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
namespace blink {
FragmentAnchor* FragmentAnchor::TryCreate(const KURL& url,
LocalFrame& frame,
bool same_document_navigation,
bool should_scroll) {
DCHECK(frame.GetDocument());
FragmentAnchor* anchor = nullptr;
const bool text_fragment_identifiers_enabled =
RuntimeEnabledFeatures::TextFragmentIdentifiersEnabled(
frame.GetDocument());
// The text fragment anchor will be created if we successfully parsed the
// text directive but we only do the text matching later on.
bool text_fragment_anchor_created = false;
if (text_fragment_identifiers_enabled) {
anchor = TextFragmentAnchor::TryCreateFragmentDirective(
url, frame, same_document_navigation, should_scroll);
text_fragment_anchor_created = anchor;
}
// Count cases of other delimiter candidates. We don't care about whether
// they're followed by a text directive since they've never been used with
// it.
if (url.HasFragmentIdentifier()) {
if (url.FragmentIdentifier().Find("~&~") != kNotFound) {
UseCounter::Count(frame.GetDocument(),
WebFeature::kFragmentHasTildeAmpersandTilde);
}
if (url.FragmentIdentifier().Find("~@~") != kNotFound) {
UseCounter::Count(frame.GetDocument(),
WebFeature::kFragmentHasTildeAtTilde);
}
if (url.FragmentIdentifier().Find("&delimiter?") != kNotFound) {
UseCounter::Count(frame.GetDocument(),
WebFeature::kFragmentHasAmpersandDelimiterQuestion);
}
}
// For the actual delimiter, we must determine whether to use count it at
// the point where we strip the directive. We can't use count it at that
// point because the DocumentLoader hasn't yet been created.
if (frame.GetDocument()->UseCountFragmentDirective()) {
UseCounter::Count(frame.GetDocument(),
WebFeature::kFragmentHasColonTildeColon);
}
bool element_id_anchor_found = false;
if (!anchor) {
anchor = ElementFragmentAnchor::TryCreate(url, frame, should_scroll);
element_id_anchor_found = anchor;
}
// Track how often we have a element fragment that we can't find. Only track
// if we didn't match a text fragment since we expect those would inflate the
// "failed" case.
if (IsA<HTMLDocument>(frame.GetDocument()) && url.HasFragmentIdentifier() &&
!text_fragment_anchor_created) {
UMA_HISTOGRAM_BOOLEAN("TextFragmentAnchor.ElementIdFragmentFound",
element_id_anchor_found);
}
return anchor;
}
} // namespace blink
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