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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_
#define COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_
#include <map>
#include <vector>
#include "base/containers/flat_set.h"
#include "base/memory/raw_ref.h"
#include "components/autofill/content/renderer/timing.h"
#include "components/autofill/core/common/field_data_manager.h"
#include "components/autofill/core/common/form_data.h"
#include "components/autofill/core/common/unique_ids.h"
namespace autofill {
class AutofillAgent;
// Manages the forms in a single RenderFrame.
class FormCache {
public:
struct UpdateFormCacheResult {
UpdateFormCacheResult();
UpdateFormCacheResult(UpdateFormCacheResult&&);
UpdateFormCacheResult& operator=(UpdateFormCacheResult&&);
~UpdateFormCacheResult();
// The updated forms are those forms that are new or are still present and
// have changed.
std::vector<FormData> updated_forms;
// The forms that have been removed from the DOM.
base::flat_set<FormRendererId> removed_forms;
};
explicit FormCache(AutofillAgent* owner);
FormCache(const FormCache&) = delete;
FormCache& operator=(const FormCache&) = delete;
~FormCache();
void Reset();
// Returns the diff of forms since the last call to UpdateFormCache(): the new
// forms, the still present but changed forms, and the removed forms.
//
// A form is *new* / *still present* / *removed* if if its renderer ID
// - is / is / is not in the current DOM and considered interesting, and
// - was not / was / was in the previous DOM and considered interesting,
// where the
// - current DOM is the DOM at the time of UpdateFormCacheResult()
// - previous DOM is the DOM at the time of the last UpdateFormCacheResult()
// call
// - a form is interesting if it contains an editable field or an iframe
// (see IsFormInteresting() for details), and its fields and iframes do
// not exceed the limits (see below).
//
// A form has *changed* if it differs from the previous
// form of the same renderer IDs according to FormData::DeepEqual().
//
// To reduce the computational cost, we limit the number of fields and frames
// summed over all forms, in addition to the per-form limits in
// form_util::FormOrFieldsetsToFormData():
// - if the number of fields over all forms exceeds |kMaxExtractableFields|,
// only a subset of forms is returned which does not exceed the limit;
// - if the number of frames over all forms exceeds |kMaxExtractableFrames|,
// all forms are returned but only a subset of them have non-empty
// FormData::child_frames.
// In either case, the subset is chosen so that the returned list of forms
// does not exceed the limits of fields and frames.
//
// Updates |extracted_forms_| to contain the forms that are currently in the
// DOM.
UpdateFormCacheResult UpdateFormCache(
const FieldDataManager& field_data_manager,
const CallTimerState& timer_state);
const std::map<FormRendererId, std::unique_ptr<FormData>>& extracted_forms()
const {
return extracted_forms_;
}
private:
friend class FormCacheTestApi;
// The owning AutofillAgent.
const raw_ref<AutofillAgent> agent_;
// The cached forms. This is used to figure out which forms changed between
// two parsing operations so that only the changed forms are potentially
// reparsed later and not all forms. A null form means that for a given web
// form (either a WebFormElement or the form of unowned elements), extraction
// failed (see `form_util::ExtractFormData()` for reasons of failing
// extractions).
std::map<FormRendererId, std::unique_ptr<FormData>> extracted_forms_;
};
} // namespace autofill
#endif // COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_
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