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For a detailed discussion of this code, see this chapter from 500 Lines:
http://aosabook.org/en/500L/a-template-engine.html
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S)�Templitea� A simple template renderer, for a nano-subset of Django syntax.
Supported constructs are extended variable access::
{{var.modifier.modifier|filter|filter}}
loops::
{% for var in list %}...{% endfor %}
and ifs::
{% if var %}...{% endif %}
Comments are within curly-hash markers::
{# This will be ignored #}
Any of these constructs can have a hypen at the end (`-}}`, `-%}`, `-#}`),
which will collapse the whitespace following the tag.
Construct a Templite with the template text, then use `render` against a
dictionary context to create a finished string::
templite = Templite('''
<h1>Hello {{name|upper}}!</h1>
{% for topic in topics %}
<p>You are interested in {{topic}}.</p>
{% endif %}
''',
{'upper': str.upper},
)
text = templite.render({
'name': "Ned",
'topics': ['Python', 'Geometry', 'Juggling'],
})
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zTemplite._expr_codec C s t d | | f � � d S)z6Raise a syntax error using `msg`, and showing `thing`.z%s: %rN)r )r �msg�thingr r r r@ � s zTemplite._syntax_errorc C s3 t j d | � s" | j d | � | j | � d S)z�Track that `name` is used as a variable.
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