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// Copyright (c) 2011 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 CHROME_BROWSER_AUTOFILL_AUTOFILL_SCANNER_H_
#define CHROME_BROWSER_AUTOFILL_AUTOFILL_SCANNER_H_
#pragma once
#include <vector>
#include "base/basictypes.h"
#include "base/string16.h"
class AutofillField;
// A helper class for parsing a stream of |AutofillField|'s with lookahead.
class AutofillScanner {
public:
explicit AutofillScanner(const std::vector<const 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.
const 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:
// Indicates the current position in the stream, represented as a vector.
std::vector<const AutofillField*>::const_iterator cursor_;
// The most recently saved cursor.
std::vector<const AutofillField*>::const_iterator saved_cursor_;
// The beginning pointer for the stream.
const std::vector<const AutofillField*>::const_iterator begin_;
// The past-the-end pointer for the stream.
const std::vector<const AutofillField*>::const_iterator end_;
DISALLOW_COPY_AND_ASSIGN(AutofillScanner);
};
#endif // CHROME_BROWSER_AUTOFILL_AUTOFILL_SCANNER_H_
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