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      1 // Copyright (c) 2006-2008 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 "printing/page_number.h"
      6 
      7 #include <limits>
      8 
      9 #include "base/logging.h"
     10 #include "printing/print_settings.h"
     11 
     12 namespace printing {
     13 
     14 PageNumber::PageNumber(const PrintSettings& settings, int document_page_count) {
     15   Init(settings, document_page_count);
     16 }
     17 
     18 PageNumber::PageNumber()
     19     : ranges_(NULL),
     20       page_number_(-1),
     21       page_range_index_(-1),
     22       document_page_count_(0) {
     23 }
     24 
     25 void PageNumber::operator=(const PageNumber& other) {
     26   ranges_ = other.ranges_;
     27   page_number_ = other.page_number_;
     28   page_range_index_ = other.page_range_index_;
     29   document_page_count_ = other.document_page_count_;
     30 }
     31 
     32 void PageNumber::Init(const PrintSettings& settings, int document_page_count) {
     33   DCHECK(document_page_count);
     34   ranges_ = settings.ranges.empty() ? NULL : &settings.ranges;
     35   document_page_count_ = document_page_count;
     36   if (ranges_) {
     37     page_range_index_ = 0;
     38     page_number_ = (*ranges_)[0].from;
     39   } else {
     40     if (document_page_count) {
     41       page_number_ = 0;
     42     } else {
     43       page_number_ = -1;
     44     }
     45     page_range_index_ = -1;
     46   }
     47 }
     48 
     49 int PageNumber::operator++() {
     50   if (!ranges_) {
     51     // Switch to next page.
     52     if (++page_number_ == document_page_count_) {
     53       // Finished.
     54       *this = npos();
     55     }
     56   } else {
     57     // Switch to next page.
     58     ++page_number_;
     59     // Page ranges are inclusive.
     60     if (page_number_ > (*ranges_)[page_range_index_].to) {
     61       DCHECK(ranges_->size() <= static_cast<size_t>(
     62           std::numeric_limits<int>::max()));
     63       if (++page_range_index_ == static_cast<int>(ranges_->size())) {
     64         // Finished.
     65         *this = npos();
     66       } else {
     67         page_number_ = (*ranges_)[page_range_index_].from;
     68       }
     69     }
     70   }
     71   return ToInt();
     72 }
     73 
     74 bool PageNumber::operator==(const PageNumber& other) const {
     75   return page_number_ == other.page_number_ &&
     76          page_range_index_ == other.page_range_index_;
     77 }
     78 bool PageNumber::operator!=(const PageNumber& other) const {
     79   return page_number_ != other.page_number_ ||
     80          page_range_index_ != other.page_range_index_;
     81 }
     82 
     83 }  // namespace printing
     84