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import re
import cgi
import collections
import os
import copy
try:
import markupsafe
escape = markupsafe.escape
literal = markupsafe.Markup
except ImportError:
escape = lambda x: cgi.escape(unicode(x))
literal = unicode
class Modifiers(dict):
"""Dictionary with a decorator for assigning functions to keys."""
def set(self, key):
"""
Decorator function to set the given key to the decorated function.
>>> modifiers = {}
>>> @modifiers.set('P')
... def render_tongue(self, tag_name=None, context=None):
... return ":P %s" % tag_name
>>> modifiers
{'P': <function render_tongue at 0x...>}
"""
def setter(func):
self[key] = func
return func
return setter
class Template(object):
tag_re = None
otag = '{{'
ctag = '}}'
modifiers = Modifiers()
def __init__(self, template=None, context=None, **kwargs):
from view import View
self.template = template
if kwargs:
context.update(kwargs)
self.view = context if isinstance(context, View) else View(context=context)
self._compile_regexps()
def _compile_regexps(self):
tags = {
'otag': re.escape(self.otag),
'ctag': re.escape(self.ctag)
}
section = r"%(otag)s[\#|^]([^\}]*)%(ctag)s\s*(.+?\s*)%(otag)s/\1%(ctag)s"
self.section_re = re.compile(section % tags, re.M|re.S)
tag = r"%(otag)s(#|=|&|!|>|\{)?(.+?)\1?%(ctag)s+"
self.tag_re = re.compile(tag % tags)
def _render_sections(self, template, view):
while True:
match = self.section_re.search(template)
if match is None:
break
section, section_name, inner = match.group(0, 1, 2)
section_name = section_name.strip()
it = self.view.get(section_name, None)
replacer = ''
# Callable
if it and isinstance(it, collections.Callable):
replacer = it(inner)
# Dictionary
elif it and hasattr(it, 'keys') and hasattr(it, '__getitem__'):
if section[2] != '^':
replacer = self._render_dictionary(inner, it)
# Lists
elif it and hasattr(it, '__iter__'):
if section[2] != '^':
replacer = self._render_list(inner, it)
# Other objects
elif it and isinstance(it, object):
if section[2] != '^':
replacer = self._render_dictionary(inner, it)
# Falsey and Negated or Truthy and Not Negated
elif (not it and section[2] == '^') or (it and section[2] != '^'):
replacer = self._render_dictionary(inner, it)
template = literal(template.replace(section, replacer))
return template
def _render_tags(self, template):
while True:
match = self.tag_re.search(template)
if match is None:
break
tag, tag_type, tag_name = match.group(0, 1, 2)
tag_name = tag_name.strip()
func = self.modifiers[tag_type]
replacement = func(self, tag_name)
template = template.replace(tag, replacement)
return template
def _render_dictionary(self, template, context):
self.view.context_list.insert(0, context)
template = Template(template, self.view)
out = template.render()
self.view.context_list.pop(0)
return out
def _render_list(self, template, listing):
insides = []
for item in listing:
insides.append(self._render_dictionary(template, item))
return ''.join(insides)
@modifiers.set(None)
def _render_tag(self, tag_name):
raw = self.view.get(tag_name, '')
# For methods with no return value
if not raw and raw is not 0:
if tag_name == '.':
raw = self.view.context_list[0]
else:
return ''
return escape(raw)
@modifiers.set('!')
def _render_comment(self, tag_name):
return ''
@modifiers.set('>')
def _render_partial(self, template_name):
from pystache import Loader
markup = Loader().load_template(template_name, self.view.template_path, encoding=self.view.template_encoding)
template = Template(markup, self.view)
return template.render()
@modifiers.set('=')
def _change_delimiter(self, tag_name):
"""Changes the Mustache delimiter."""
self.otag, self.ctag = tag_name.split(' ')
self._compile_regexps()
return ''
@modifiers.set('{')
@modifiers.set('&')
def render_unescaped(self, tag_name):
"""Render a tag without escaping it."""
return literal(self.view.get(tag_name, ''))
def render(self, encoding=None):
template = self._render_sections(self.template, self.view)
result = self._render_tags(template)
if encoding is not None:
result = result.encode(encoding)
return result
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