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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_SCANNER_H_ | |
6 #define COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_SCANNER_H_ | |
7 | |
8 #include <vector> | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "base/strings/string16.h" | |
12 | |
13 namespace autofill { | |
14 | |
15 class AutofillField; | |
16 | |
17 // A helper class for parsing a stream of |AutofillField|'s with lookahead. | |
18 class AutofillScanner { | |
19 public: | |
20 explicit AutofillScanner(const std::vector<const AutofillField*>& fields); | |
21 ~AutofillScanner(); | |
22 | |
23 // Advances the cursor by one step, if possible. | |
24 void Advance(); | |
25 | |
26 // Returns the current field in the stream, or |NULL| if there are no more | |
27 // fields in the stream. | |
28 const AutofillField* Cursor() const; | |
29 | |
30 // Returns |true| if the cursor has reached the end of the stream. | |
31 bool IsEnd() const; | |
32 | |
33 // Restores the most recently saved cursor. See also |SaveCursor()|. | |
34 void Rewind(); | |
35 | |
36 // Repositions the cursor to the specified |index|. See also |SaveCursor()|. | |
37 void RewindTo(size_t index); | |
38 | |
39 // Saves and returns the current cursor position. See also |Rewind()| and | |
40 // |RewindTo()|. | |
41 size_t SaveCursor(); | |
42 | |
43 private: | |
44 // Indicates the current position in the stream, represented as a vector. | |
45 std::vector<const AutofillField*>::const_iterator cursor_; | |
46 | |
47 // The most recently saved cursor. | |
48 std::vector<const AutofillField*>::const_iterator saved_cursor_; | |
49 | |
50 // The beginning pointer for the stream. | |
51 const std::vector<const AutofillField*>::const_iterator begin_; | |
52 | |
53 // The past-the-end pointer for the stream. | |
54 const std::vector<const AutofillField*>::const_iterator end_; | |
55 | |
56 DISALLOW_COPY_AND_ASSIGN(AutofillScanner); | |
57 }; | |
58 | |
59 } // namespace autofill | |
60 | |
61 #endif // COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_SCANNER_H_ | |
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