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// Copyright 2013 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.
#ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_SCANNER_H_
#define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_SCANNER_H_
#include <stddef.h>
#include <memory>
#include <vector>
#include "base/macros.h"
#include "base/strings/string16.h"
namespace autofill {
class AutofillField;
// A helper class for parsing a stream of |AutofillField|'s with lookahead.
class AutofillScanner {
public:
explicit AutofillScanner(const std::vector<AutofillField*>& fields);
explicit AutofillScanner(
const std::vector<std::unique_ptr<AutofillField>>& fields);
~AutofillScanner();
// Advances the cursor by one step, if possible.
void Advance();
// Returns the current field in the stream, or |NULL| if there are no more
// fields in the stream.
AutofillField* Cursor() const;
// Returns |true| if the cursor has reached the end of the stream.
bool IsEnd() const;
// Restores the most recently saved cursor. See also |SaveCursor()|.
void Rewind();
// Repositions the cursor to the specified |index|. See also |SaveCursor()|.
void RewindTo(size_t index);
// Saves and returns the current cursor position. See also |Rewind()| and
// |RewindTo()|.
size_t SaveCursor();
private:
void Init(const std::vector<AutofillField*>& fields);
// Indicates the current position in the stream, represented as a vector.
std::vector<AutofillField*>::const_iterator cursor_;
// The most recently saved cursor.
std::vector<AutofillField*>::const_iterator saved_cursor_;
// The beginning pointer for the stream.
std::vector<AutofillField*>::const_iterator begin_;
// The past-the-end pointer for the stream.
std::vector<AutofillField*>::const_iterator end_;
// The storage of non-owning pointers, used for the unique_ptr constructor.
std::vector<AutofillField*> non_owning_;
DISALLOW_COPY_AND_ASSIGN(AutofillScanner);
};
} // namespace autofill
#endif // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_SCANNER_H_
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