OpenSystemsDevelopment / qpdf

Commit 5b0030ff5978a4958bec625d2f8a4db34f34ca1a

Authored by m-holger
Committed by Jay Berkenbilt
1 parent 956a272d

Tidy pdf-bookmarks example 

Convert loops to use range-based for statements.
Simplify the extract_bookmarks function.
Inline Side-by-side
Showing 1 changed file with 17 additions and 20 deletions
examples/pdf-bookmarks.cc
  View file @5b0030f
... ... @@ -5,11 +5,14 @@
5 5 #include <qpdf/QPDFPageDocumentHelper.hh>
6 6 #include <qpdf/QPDFOutlineDocumentHelper.hh>
7 7 #include <qpdf/QUtil.hh>
  8 +#include <qpdf/QIntC.hh>
8 9 #include <qpdf/QTC.hh>
9 10  
10 11 // This program demonstrates extraction of bookmarks using the qpdf
11 12 // outlines API. Note that all the information shown by this program
12 13 // can also be obtained from a PDF file using qpdf's --json option.
  14 +//
  15 +// Ignore calls to QTC::TC - they are for qpdf CI testing only.
13 16  
14 17 static char const* whoami = 0;
15 18 static enum { st_none, st_numbers, st_lines } style = st_none;
... ... @@ -51,13 +54,10 @@ void print_lines(std::vector&lt;int&gt;&amp; numbers)
51 54 void generate_page_map(QPDF& qpdf)
52 55 {
53 56 QPDFPageDocumentHelper dh(qpdf);
54   - std::vector<QPDFPageObjectHelper> pages = dh.getAllPages();
55 57 int n = 0;
56   - for (std::vector<QPDFPageObjectHelper>::iterator iter = pages.begin();
57   - iter != pages.end(); ++iter)
  58 + for (auto const& page : dh.getAllPages())
58 59 {
59   - QPDFObjectHandle oh = (*iter).getObjectHandle();
60   - page_map[oh.getObjGen()] = ++n;
  60 + page_map[page.getObjectHandle().getObjGen()] = ++n;
61 61 }
62 62 }
63 63  
... ... @@ -73,10 +73,9 @@ void show_bookmark_details(QPDFOutlineObjectHelper outline,
73 73  
74 74 case st_numbers:
75 75 QTC::TC("examples", "pdf-bookmarks numbers");
76   - for (std::vector<int>::iterator iter = numbers.begin();
77   - iter != numbers.end(); ++iter)
  76 + for (auto const& number : numbers)
78 77 {
79   - std::cout << *iter << ".";
  78 + std::cout << number << ".";
80 79 }
81 80 std::cout << " ";
82 81 break;
... ... @@ -138,20 +137,18 @@ void show_bookmark_details(QPDFOutlineObjectHelper outline,
138 137 void extract_bookmarks(std::vector<QPDFOutlineObjectHelper> outlines,
139 138 std::vector<int>& numbers)
140 139 {
141   - numbers.push_back(0);
142   - for (std::vector<QPDFOutlineObjectHelper>::iterator iter = outlines.begin();
143   - iter != outlines.end(); ++iter)
  140 + // For style == st_numbers, numbers.at(n) contains the numerical
  141 + // label for the outline, so we count up from 1.
  142 + // For style == st_lines, numbers.at(n) == 0 indicates the last
  143 + // outline at level n, and we don't otherwise care what the value
  144 + // is, so we count up to zero.
  145 + numbers.push_back(
  146 + (style == st_lines) ? -QIntC::to_int(outlines.size()) : 0);
  147 + for (auto& outline : outlines)
144 148 {
145 149 ++(numbers.back());
146   - show_bookmark_details(*iter, numbers);
147   - std::vector<QPDFOutlineObjectHelper>::iterator next = iter;
148   - ++next;
149   - bool has_next = (next != outlines.end());
150   - if ((style == st_lines) && (! has_next))
151   - {
152   - numbers.back() = 0;
153   - }
154   - extract_bookmarks((*iter).getKids(), numbers);
  150 + show_bookmark_details(outline, numbers);
  151 + extract_bookmarks(outline.getKids(), numbers);
155 152 }
156 153 numbers.pop_back();
157 154 }
... ...