components/autofill/core/browser/autofill_scanner.cc

   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 #include "components/autofill/core/browser/autofill_scanner.h"
   6
   7 #include "base/logging.h"
   8 #include "components/autofill/core/browser/autofill_field.h"
   9
  10 namespace autofill {
  11
  12 AutofillScanner::AutofillScanner(std::vector<AutofillField*>& fields)
  13     : cursor_(fields.begin()),
  14       saved_cursor_(fields.begin()),
  15       begin_(fields.begin()),
  16       end_(fields.end()) {
  17 }
  18
  19 AutofillScanner::~AutofillScanner() {
  20 }
  21
  22 void AutofillScanner::Advance() {
  23   DCHECK(!IsEnd());
  24   ++cursor_;
  25 }
  26
  27 AutofillField* AutofillScanner::Cursor() const {
  28   if (IsEnd()) {
  29     NOTREACHED();
  30     return NULL;
  31   }
  32
  33   return *cursor_;
  34 }
  35
  36 bool AutofillScanner::IsEnd() const {
  37   return cursor_ == end_;
  38 }
  39
  40 void AutofillScanner::Rewind() {
  41   DCHECK(saved_cursor_ != end_);
  42   cursor_ = saved_cursor_;
  43   saved_cursor_ = end_;
  44 }
  45
  46 void AutofillScanner::RewindTo(size_t index) {
  47   DCHECK(index < static_cast<size_t>(end_ - begin_));
  48   cursor_ = begin_ + index;
  49   saved_cursor_ = end_;
  50 }
  51
  52 size_t AutofillScanner::SaveCursor() {
  53   saved_cursor_ = cursor_;
  54   return static_cast<size_t>(cursor_ - begin_);
  55 }
  56
  57 }  // namespace autofill