ANN: pyTenjin 1.1.0 - a high-speed and full-featured template engine

Makoto Kuwata kwa at kuwata-lab.com
Fri Feb 17 04:00:00 CET 2012


I released pyTenjin 1.1.0.
http://pypi.python.org/pypi/Tenjin/
http://www.kuwata-lab.com/tenjin/


Overview of pyTenjin
--------------------

* Very fast: about 10 times faster than Django template engine
* Easy to learn: no need to learn template-original language
* Full-featured: nestable layout template, partial template, preprocessing, etc.
* Lightweight: only 2000 lines of code and very fast to import.
* Google App Engine supported


Documents
---------

* User's Guide
  http://www.kuwata-lab.com/tenjin/pytenjin-users-guide.html
* Examples
  http://www.kuwata-lab.com/tenjin/pytenjin-examples.html
* CHANGES
  http://www.kuwata-lab.com/tenjin/pytenjin-CHANGES.txt


Install
-------

    $ sudo easy_install Tenjin

Or:

    $ wget http://pypi.python.org/packages/source/T/Tenjin/Tenjin-1.1.0.tar.gz
    $ tar xzf Tenjin-1.1.0.tar.gz
    $ cd Tenjin-1.1.0/
    $ sudo python setup.py install


Example
-------

    ## views/example.pyhtml
    <?py #@ARGS title, items ?>
    <h2>${title}</h2>
    <table>
      <?py cycle = new_cycle('odd', 'even') ?>
      <?py for item in items: ?>
      <tr class="${cycle()}">
        <td>${item}</td>
      </tr>
      <?py #endfor ?>
    </table>

    ## main.py
    import tenjin
    #tenjin.set_template_encoding('utf-8')  # optional (default 'utf-8')
    from tenjin.helpers import *
    from tenjin.html import *
    engine = tenjin.Engine(path=['views'])
    context = {'title': 'Example', 'items': ['Haruhi', 'Mikuru', 'Yuki'] }
    output = engine.render('example.pyhtml', context)
    print(output)

    ## output
    $ python main.py
    <h2>Example</h2>
    <table>
      <tr class="odd">
        <td>Haruhi</td>
      </tr>
      <tr class="even">
        <td>Mikuru</td>
      </tr>
      <tr class="odd">
        <td>Yuki</td>
      </tr>
    </table>


Enhancements and Changes in this release
----------------------------------------

(See http://www.kuwata-lab.com/tenjin/pytenjin-CHANGES.txt for details.)

* [Change] !! IMPORTANT!! Default cache file format is changed from
  marshal format to text format.
  You should remove all cache files to use this release.

* [Enhance] Embedded pattern '${}' and '#{}' can contain pair of '{' and '}'. ::

      <p>${foo({'x':1})}</p>          # OK
      <p>${foo({}+{}+{})}</p>         # OK
      <p>${foo({'x':{'y':1}})}</p>    # NG

* [Enhance] New preprocessing mechanism. You can specify your own preprocessor
  class by 'pp' parameter.

* [Enhance] Add 'TrimPreprocessor' which removes spaces ad the
beginning of lines.
  You can reduce size of output by it.

* [Enhance] Add 'PrefixedLinePreprocessor' which converts ':: ...'
into '<?py ... ?>'.
  You may like ':: ...' because it is simpler than '<?py ... ?>'.

* [Enhance] Add 'JavaScriptPreprocessor' class which enables you to embed
  client-side javascript template code into server-side template.

  For example::

      <div id="placeholder">
        <!-- #JS: render_table(items) -->
        <table>
          <?js for (var i = 0, n = items.length; i < n; i++) { ?>
          <tr>
            <td>#{i}</td>
            <td>${items[i]}</td>
          </tr>
          <?js } ?>
        </table>
        <!-- #/JS -->
      </div>
      <script>#{tenjin.JS_FUNC}</script>
      <script>
        var html = render_table(["Haruhi", "Mikuru", "Yuki"]);
        document.getElementById('placehodler').innerHTML = html;
      </script>

  will be converted into::

      <div id="placeholder">
        <script>function render_table(items){var _buf='';
      _buf+='  <table>\n';
           for (var i = 0, n = items.length; i < n; i++) {
      _buf+='    <tr>\n\
            <td>'+_S(i)+'</td>\n\
            <td>'+_E(items[i])+'</td>\n\
          </tr>\n';
           }
      _buf+='  </table>\n';
        return _buf;};</script>
      </div>
      <script>#{tenjin.JS_FUNC}</script>
      <script>
        var html = render_table(["Haruhi", "Mikuru", "Yuki"]);
        document.getElementById('placehodler').innerHTML = html;
      </script>

  by JavaScriptPreprocessor.
  Notice that you should embed 'tenjin.JS_FUNC' to run client-side code.

  How to use it::

      pp = [ tenjin.JavaScriptPreprocessor() ]
      engine = tenjin.Engine(pp=pp)
      output = engine.render('example.pyhtml', {})
      print(html)

* [Enhance] Now supports Jython 2.5.2. (thanks to Lars Hupfeldt Nielsen)

* [Enhance] Now supports PyPy 1.7 or later officially.

* [Change] Template#convert() now converts "\r\n" into "\\r\n".
  This is necessary to follow change of language specification on
  Python 2.7 and 3.2.


Have fun!
--
makoto kuwata



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