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Tidy pdf-bookmarks example

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Convert loops to use range-based for statements.
Simplify the extract_bookmarks function.
This commit is contained in:
m-holger 2022-02-10 13:47:15 +00:00 committed by Jay Berkenbilt
parent 956a272d62
commit 5b0030ff59
1 changed files with 17 additions and 20 deletions
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37
examples/pdf-bookmarks.cc
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@ -5,11 +5,14 @@
#include <qpdf/QPDFPageDocumentHelper.hh>
#include <qpdf/QPDFOutlineDocumentHelper.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QTC.hh>
// This program demonstrates extraction of bookmarks using the qpdf
// outlines API. Note that all the information shown by this program
// can also be obtained from a PDF file using qpdf's --json option.
//
// Ignore calls to QTC::TC - they are for qpdf CI testing only.
static char const* whoami = 0;
static enum { st_none, st_numbers, st_lines } style = st_none;
@ -51,13 +54,10 @@ void print_lines(std::vector<int>& numbers)
void generate_page_map(QPDF& qpdf)
{
QPDFPageDocumentHelper dh(qpdf);
std::vector<QPDFPageObjectHelper> pages = dh.getAllPages();
int n = 0;
for (std::vector<QPDFPageObjectHelper>::iterator iter = pages.begin();
iter != pages.end(); ++iter)
for (auto const& page : dh.getAllPages())
{
QPDFObjectHandle oh = (*iter).getObjectHandle();
page_map[oh.getObjGen()] = ++n;
page_map[page.getObjectHandle().getObjGen()] = ++n;
}
}
@ -73,10 +73,9 @@ void show_bookmark_details(QPDFOutlineObjectHelper outline,
case st_numbers:
QTC::TC("examples", "pdf-bookmarks numbers");
for (std::vector<int>::iterator iter = numbers.begin();
iter != numbers.end(); ++iter)
for (auto const& number : numbers)
{
std::cout << *iter << ".";
std::cout << number << ".";
}
std::cout << " ";
break;
@ -138,20 +137,18 @@ void show_bookmark_details(QPDFOutlineObjectHelper outline,
void extract_bookmarks(std::vector<QPDFOutlineObjectHelper> outlines,
std::vector<int>& numbers)
{
numbers.push_back(0);
for (std::vector<QPDFOutlineObjectHelper>::iterator iter = outlines.begin();
iter != outlines.end(); ++iter)
// For style == st_numbers, numbers.at(n) contains the numerical
// label for the outline, so we count up from 1.
// For style == st_lines, numbers.at(n) == 0 indicates the last
// outline at level n, and we don't otherwise care what the value
// is, so we count up to zero.
numbers.push_back(
(style == st_lines) ? -QIntC::to_int(outlines.size()) : 0);
for (auto& outline : outlines)
{
++(numbers.back());
show_bookmark_details(*iter, numbers);
std::vector<QPDFOutlineObjectHelper>::iterator next = iter;
++next;
bool has_next = (next != outlines.end());
if ((style == st_lines) && (! has_next))
{
numbers.back() = 0;
}
extract_bookmarks((*iter).getKids(), numbers);
show_bookmark_details(outline, numbers);
extract_bookmarks(outline.getKids(), numbers);
}
numbers.pop_back();
}