katagami: a simple xml/html template library
Project description
This library is one of many Python templating libraries.
Features
based on XML’s Processing instructions (<?…?>)
supports both of Python 2 and Python 3
caching by functools.lru_cache (only in Python 3)
Example
Setup:
>>> def _(html, encoding='utf-8'): ... print(render(io.BytesIO(html)).decode(encoding))
Make a HTML string with inline expression and Python’s for (Block structure):
>>> _(b'''<html>
... <body>
... <? for name in ['world']: {?>
... <p>hello, <?=name?></p>
... <?}?>
... </body>
... </html>''')
<html>
<body>
<BLANKLINE>
<p>hello, world</p>
<BLANKLINE>
</body>
</html>
Inline expression
This feature evaluates your inline expression and output to result:
>>> _(b'''<html><body>
... <?='hello, world'?>
... </body></html>''')
<html><body>
hello, world
</body></html>
By the default, this example raises an exception, evaluated expression must be str (unicode in Python 2):
>>> _(b'''<html><body> ... <?=1?> ... </body></html>''') Traceback (most recent call last): ... TypeError: Can't convert 'int' object to str implicitly
Set the cast_string feature:
>>> _(b'''<html><body>
... <?=feature cast_string="True"?>
... <?=1?>
... </body></html>''')
<html><body>
<BLANKLINE>
1
</body></html>
Also set the trap_exceptions feature:
>>> _(b'''<html><body>
... <?=feature trap_exceptions="True"?>
... <?=1?>
... </body></html>''')
<html><body>
<BLANKLINE>
Can't convert 'int' object to str implicitly
</body></html>
Note
You can use cast_string and trap_exceptions simultaneously.
You can handle cast_string and trap_exceptions by defining the function __str__. By the default, __str__ is str in Python 3 (unicode in Python 2).
Spaces on the both sides of the expression will be stripped. But ‘<?= feature’ is a bad.
You can insert a comment.
Example:
>>> _(b'''<html><body>
... <?py
... def __str__(o):
... return '__str__(%s)' % o
... ?>
... <?=feature cast_string="True" trap_exceptions="True"?>
... <?= 1 ?>
... <?= notfound # get an error ?>
... </body></html>''')
<html><body>
<BLANKLINE>
<BLANKLINE>
__str__(1)
__str__(name 'notfound' is not defined)
</body></html>
Embed script
All indentation will be arranged automatically:
>>> _(b'''<html>
... <?py
... # It is a top level here. This works fine.
... if 1:
... msg = 'message from indented script'
... ?>
... <body>
... <p><?=msg?></p>
... <?py msg = 'message from single line script' # This works fine too. ?>
... <p><?=msg?></p>
... <? if 1: {?>
... <?py
... # Is is nested here. This also works fine.
... msg = 'message from nested indented script'
... ?>
... <p><?=msg?></p>
... <?}?>
... </body>
... </html>''')
<html>
<BLANKLINE>
<body>
<p>message from indented script</p>
<BLANKLINE>
<p>message from single line script</p>
<BLANKLINE>
<BLANKLINE>
<p>message from nested indented script</p>
<BLANKLINE>
</body>
</html>
Block structure
Indentation with C-style block structure:
>>> _(b'''<html>
... <body>
... <p>hello,
... <? try: {?>
... <?=name?>
... <?} except NameError: {?>
... NameError
... <?} else: {?>
... never output here
... <?}?>
... </p>
... </body>
... </html>''')
<html>
<body>
<p>hello,
<BLANKLINE>
<BLANKLINE>
NameError
<BLANKLINE>
</p>
</body>
</html>
Note
‘<? }’ and ‘{ ?>’ are wrong. Don’t insert space. ‘<?}’ and ‘{?>’ are correct.
Ending colon (‘:’) is required.
Block closing ‘<?}?>’ is required.
Encoding detection
Encoding will be detected automatically:
>>> _(b'''<html>
... <head><meta charset="shift-jis"></head>
... <body>\x93\xfa\x96{\x8c\xea</body>
... </html>''', 'shift-jis')
<html>
<head><meta charset="shift-jis"></head>
<body>\u65e5\u672c\u8a9e</body>
</html>
Supported formats:
<?xml encoding=”ENCODING”?>
<meta charset=”ENCODING”>
<meta http-equiv=”Content-Type” content=”MIMETYPE; ENCODING”>
API
katagami.render
katagami.render(__file__, __encoding__=None, **locals)
__file__ – file-like object (use io.BytesIO for string input) or filename.
__encoding__ – Set encoding of __file__ and the return value. Automatically detect the encoding if None.
locals – local and global namespace values for template script.
return – bytes in Python 3, str in Python 2. The return value is encoded by __encoding__ or automatically detected encoding.
Rendering template flow:
detect encoding
decode to str in Python 3 (unicode in Python 2)
translate template to Python script
compile and exec the script
encode result to bytes in Python 3 (str in Python 2)
History
1.0.0 remove backward compatibility
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