1 // Copyright 2013 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_CORE_BROWSER_AUTOFILL_SCANNER_H_ 6 #define COMPONENTS_AUTOFILL_CORE_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_CORE_BROWSER_AUTOFILL_SCANNER_H_ 62
