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Work with text files describing PDF bookmarks (stable)

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bmconverter.py

http://github.com/goerz/bmconverter.py

Author: Michael Goerz

bmconverter.py converts between the bookmark description formats used by different pdf and djvu bookmarking tools such as pdftk, the iText toolbox, pdfLaTeX pdfWriteBookmarks, jpdftweak, djvused, and the DJVU Bookmark Tool.

This code is licensed under the GPL

Install

Store the bmconverter.py script anywhere in your $PATH.

Usage

The script operates on text files in the various supported formats that describe the bookmark structure in pdf or djvu files. You can then use the appropriate tools to add the bookmarks to the pdf or djvu file.

The script includes some rudimentary functionality to extract the bookmarks directly from a pdf file (writing to any of the supported text formats). This functionality depends on the pdfminer library. Advanced features like formatting of the bookmark titles are not supported in the extraction.

In addition to converting between the different formats, the script can also shift the page numbers associated with the bookmarks. This is useful if you need to work on a file obtained from a table of contents, where the page numbers in the pdf might not match the page numbers in the original document, for example.

When used as a module from python, this script provides a toolbox for making arbitrary modifications to the bookmark data

Usage: bmconverter.py options inputfile [outputfile]


Command Line Options

 --mode in2out        Sets the script's operation mode. This option is required.
 -m  in2out           Short for --mode

 --offset integer     Shifts all pagenumber by integer
 -o integer           Short for --offset

 --long               When used with the 'text' output format, enables the use
                      of full destinations, instead of just page numbers
 -l                   Short for --long

 --pdf FILENAME       Set metadata['pdf'] to the given filename. When used
                      together with the latex output mode, the resulting tex
                      file will reference the given filename.

 --help               Displays full help
 -h                   Short for -help

In the mode option, 'in' and 'out' can be any of the supported formats:
'xml', 'text', 'pdftk', 'csv', 'djvused', 'latex', or 'html'

Additionally, 'in' can be 'pdf', in which case the bookmarks are read directly
from the given pdf file. The pdfminer library must be installed for this to
work.

An example usage is

bmconverter.py --offset 2 --mode xml2text bm.xml bm.txt

All data is read and written in UTF-8 encoding, with the exception of xml files, which are read in the encoding declared in their header, but always written in UTF-8

The XML Format

The XML format supports more of the pdf bookmark than any of the other tools. It is used by the iText toolbox.

Two examples of such XML files would be

<?xml version="1.0" encoding="ISO8859-1"?>
<Bookmark>
   <Title Action="GoTo" Page="1 XYZ 300 800 0" >root
     <Title Action="GoTo" Open="false" Page="1 FitH 500" >sub 1
       <Title Action="GoTo" Page="1 FitBV 100" >sub 2.1</Title>
       <Title Action="GoTo" Page="1 Fit" >sub 2.2</Title>
     </Title>
     <Title Action="GoTo" Page="1 FitR 200 300 400 500" >sub 2</Title>
   </Title>
</Bookmark>


<?xml version="1.0" encoding="ISO8859-1"?>
<Bookmark>
   <Title Action="GoTo" Named="Title" >Go to the top of the page</Title>
   <Title Color="0 0.50196 0.50196" Style="bold" >
     Toggle the state of the answers</Title>
   <Title Open="false" >Useful links
     <Title Action="URI" URI="http://www.lowagie.com/iText" >
       Bruno&apos;s iText site</Title>
     <Title Action="URI" URI="http://itextpdf.sourceforge.net/" >
       Paulo&apos;s iText site</Title>
     <Title Action="URI" URI="http://sourceforge.net/projects/itext/" >
       iText @ SourceForge</Title>
   </Title>
   <Title >&#48712;&#51665;</Title>
   <Title Action="GoTo" Style="italic" Page="2 FitB" >
     What&apos;s on page 2?</Title>
</Bookmark>

For more details, see the iText documentation.

The Text Format

The text format's purpose is to provide a format that is easier to write by hand than the XML format that iText can put in a PDF file. The text format cannot handle all the features the XML format can. It is intended to be used for only basic bookmarks: a hirarchy of bookmarks, each pointing a page, without further formatting, external destinations, etc.

The format is used by the pdfWriteBookmarks tool.

The format of the text file is simple: each bookmark is represented by a single line. The bookmark's level is taken from the indentation. There must be exactly 4 spaces indentation per level. Next is the title of the Bookmark, then a double colon, and lastly the pagenumber, optionally followed by a destination.

An example bookmark text file is:

Page 1 :: 1
Page 2 :: 2 XYZ null null null
Page 3 :: 3
Sublevels on page 4 :: 4
    Sub1 :: 5 XYZ 0 10 null
    Sub2 :: 5 XYZ 0 20 null
    Sub3 :: 6 XYZ 0 30 null
        SubSub1 :: 6
        SubSub2:: 6
    Sub4 :: 7
        SubSub1 :: 8
        SubSub2 :: 9
    Sub5 :: 10
Page 11 :: 11

Specifically, each line is matched by the following regular expression:

      (?P<indent>\s*)
      (?P<text>\S.*)   ::  [ ]*  (?P<page>[0-9]*)
      [ ]* (?P<dest> (XYZ.*) | (Fit.*))?  [ ]*

The full destinations (e.g. 'XYZ 0 10 null') are only printed if if the --long option is used.

Note that this format is very limited: it does not express actions other than GoTo, preserve leading or trailing whitespace in a title, or express titles that consist only of whitespaces.

The pdftk Format

In the pdftk format, each bookmark is described by three lines, like this:

BookmarkTitle: Page1
BookmarkLevel: 1
BookmarkPageNumber: 1

Lines not belonging to this structure are discarded. The format is the direct output of the pdftk utility, when run as $ pdftk file.pdf dumpdata

The html Format

This format is a HTML file with a special structure. Such files are produced by Adobe Acrobat when you export a PDF file to HTML. They are also used as the input for the DJVU Bookmark Tool.

An example of the format is the following:

  <html>
  <body>
  <ul>
    <li><a href="#1">Link to page 1</a></li>
    <li><a href="#2">Link to page 2</a></li>
    <li><a href="#3">Chapter 1</a>
      <ul>
        <li><a href="#4">Link to page 4</a></li>
        <li><a href="#5">Link to page 5</a></li>
      </ul>
    </li>
    <li><a href="">Chapter 2, no link here</a>
      <ul>
        <li><a href="#6">Subsection</a>
          <ul>
            <li><a href="#7">Link to page 7</a></li>
            <li><a href="#8">Link to page 8</a></li>
          </ul>
        </li>
        <li><a href="#9">Link to page 9</a></li>
      </ul>
    </li>
    <li><a href="book.djvu#10">Link to page 10 in book.djvu</a></li>
    <li><a href="http://windjview.sourceforge.net">Web link</a></li>
  </ul>
  </body>
  </html>

The csv Format

The csv format is read and writen by the jpdftweak program. Each bookmark is a line of fields seperated by semicolon. Specifically, the structure of each line is described by the following extended regular expression:

    (?P<depth>         -?[0-9]+);
    (?P<flags>         O?B?I?);    # open, bold, italic
    (?P<title>         [^;]*);
    (?P<page>          -?[0-9]+)
    (?P<destination>   [ ][^;]+)?  # e.g. FitBV 100
    (?P<moreopts>      ;[^;]*)?    # key1=value1 key2=value2 ...

moreopts keys can be:

  Action        if action is not GoTo
  File          for GoToR actions
  Page          for GoToR actions (the page group is 0 in this case,
                Page consists of page number and destination)
  URI           for URI actions
  Color

Also, the contents of all fields in the csv is escaped: all nonprintable characters (ascii < 32) and the characters [\:"'] are replaced by \HH, where HH is the two digit ascii hex code (in upper case) for that character.

The djvused Format

This format is read and written by the djvused program.

The outline syntax is a single list of the form

(bookmarks ...)

The first element of the list is symbol bookmarks. The subsequent elements are lists representing the toplevel outline entries. Each outline entry is represented by a list with the following form:

(title url ... )

The string title is the title of the outline entry. The string url is composed of the hash character ("#") followed by either the component file identifier or the page number corresponding to the outline entry. The remaining expressions describe subentries of this outline entry.

An example of the format is the following:

(bookmarks
 ("level1"
  "#1"
  ("level2"
   "#11"
   ("level3"
    "#20" ) ) )
 ("Bookmark \"In Quotes\""
  "../external.djvu#2"
  ("Unicode \303\215\303\261\305\244\304\230\320"
   "www.google.com" ) ) )

Note how the target url can be the pagenumber, an external reference, or a url. Quotes inside the title have to be escaped. Non-ascii characters are written as escaped octal UTF-8

The latex Format

The latex format results in a standalone tex file that adds the bookmarks to the target pdf when compiled with pdflatex (after a few edits). This is possible by using the pdfpages, hyperref, and bookmark packages. See especially the documentation of the bookmark package to see how bookmarks are expressed.

An example of the format is the following:

\bookmark[view={XYZ null null null}, page=1,level=0]{level 1 bookmark}

For parsing the latex format, each \bookmark entry must be written entirely one a single line

Interactive Usage

This script was designed to provide a toolbox for working on bookmark structures when used as module from Python.

The Bookmark class is the central data structure, representing a bookmark tree. Each nodes holds all the attributes of the bookmark, and a list of all its children. A number of methods is provided to modify the tree structure.

Note that each bookmark tree has a dummy root, which does not hold any data (and is ignored in output)

The Tree is iterable in a preorder traversion.

For more information, read the Bookmark class documentation.

Apart from the Bookmark data structure, the module provides importers and exporters for all the supported formats.

An example of an interactive usage is shown below. It reads the bookmark structure from a text file, sets the appearance of all bookmarks at a level deeper than 2 to 'closed' in Acrobat Reader, and write the resulting structure to an iText xml file.

>>> from bmconverter import *
>>> bm, md = read_text("bookmarks.txt")
>>> for node in bm:
...     if node.level() > 2:
...         node.open = False
...     else:
...         node.open = True
...
>>> write_xml(bm, "bookmarks.xml")

For the full documentation, run

>>> import bmconverter
>>> help(bmconverter)

inside the python interpretor.

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