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A small templating language
This implements a small templating language for use internally in
Paste and Paste Script. This language implements if/elif/else,
for/continue/break, expressions, and blocks of Python code. The
syntax is::
{{any expression (function calls etc)}}
{{any expression | filter}}
{{for x in y}}...{{endfor}}
{{if x}}x{{elif y}}y{{else}}z{{endif}}
{{py:x=1}}
{{py:
def foo(bar):
return 'baz'
}}
{{default var = default_value}}
{{# comment}}
You use this with the ``Template`` class or the ``sub`` shortcut.
The ``Template`` class takes the template string and the name of
the template (for errors) and a default namespace. Then (like
``string.Template``) you can call the ``tmpl.substitute(**kw)``
method to make a substitution (or ``tmpl.substitute(a_dict)``).
``sub(content, **kw)`` substitutes the template immediately. You
can use ``__name='tmpl.html'`` to set the name of the template.
If there are syntax errors ``TemplateError`` will be raised.
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Lex a string into chunks:
>>> lex('hey')
['hey']
>>> lex('hey {{you}}')
['hey ', ('you', (1, 7))]
>>> lex('hey {{')
Traceback (most recent call last):
...
TemplateError: No }} to finish last expression at line 1 column 7
>>> lex('hey }}')
Traceback (most recent call last):
...
TemplateError: }} outside expression at line 1 column 7
>>> lex('hey {{ {{')
Traceback (most recent call last):
...
TemplateError: {{ inside expression at line 1 column 10
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Takes a lexed set of tokens, and removes whitespace when there is
a directive on a line by itself:
>>> tokens = lex('{{if x}}\nx\n{{endif}}\ny', trim_whitespace=False)
>>> tokens
[('if x', (1, 3)), '\nx\n', ('endif', (3, 3)), '\ny']
>>> trim_lex(tokens)
[('if x', (1, 3)), 'x\n', ('endif', (3, 3)), 'y']
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Parses a string into a kind of AST
>>> parse('{{x}}')
[('expr', (1, 3), 'x')]
>>> parse('foo')
['foo']
>>> parse('{{if x}}test{{endif}}')
[('cond', (1, 3), ('if', (1, 3), 'x', ['test']))]
>>> parse('series->{{for x in y}}x={{x}}{{endfor}}')
['series->', ('for', (1, 11), ('x',), 'y', ['x=', ('expr', (1, 27), 'x')])]
>>> parse('{{for x, y in z:}}{{continue}}{{endfor}}')
[('for', (1, 3), ('x', 'y'), 'z', [('continue', (1, 21))])]
>>> parse('{{py:x=1}}')
[('py', (1, 3), 'x=1')]
>>> parse('{{if x}}a{{elif y}}b{{else}}c{{endif}}')
[('cond', (1, 3), ('if', (1, 3), 'x', ['a']), ('elif', (1, 12), 'y', ['b']), ('else', (1, 23), None, ['c']))]
Some exceptions::
>>> parse('{{continue}}')
Traceback (most recent call last):
...
TemplateError: continue outside of for loop at line 1 column 3
>>> parse('{{if x}}foo')
Traceback (most recent call last):
...
TemplateError: No {{endif}} at line 1 column 3
>>> parse('{{else}}')
Traceback (most recent call last):
...
TemplateError: else outside of an if block at line 1 column 3
>>> parse('{{if x}}{{for x in y}}{{endif}}{{endfor}}')
Traceback (most recent call last):
...
TemplateError: Unexpected endif at line 1 column 25
>>> parse('{{if}}{{endif}}')
Traceback (most recent call last):
...
TemplateError: if with no expression at line 1 column 3
>>> parse('{{for x y}}{{endfor}}')
Traceback (most recent call last):
...
TemplateError: Bad for (no "in") in 'x y' at line 1 column 3
>>> parse('{{py:x=1\ny=2}}')
Traceback (most recent call last):
...
TemplateError: Multi-line py blocks must start with a newline at line 1 column 3
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