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from __future__ import absolute_import, print_function, unicode_literals
import re
from .render import renderValue, containsFunctions
from .shared import JSONTemplateError, DeleteMarker, TemplateError, fromNow
from . import builtins
_context_re = re.compile(r'[a-zA-Z_][a-zA-Z0-9_]*$')
def render(template, context):
if type(context) != dict:
raise TemplateError("context must be a dictionary")
if not all(_context_re.match(c) for c in context):
raise TemplateError('top level keys of context must follow '
'/[a-zA-Z_][a-zA-Z0-9_]*/')
full_context = {'now': fromNow('0 seconds', None)}
full_context.update(builtins.build())
full_context.update(context)
rv = renderValue(template, full_context)
if rv is DeleteMarker:
return None
if containsFunctions(rv):
raise TemplateError('evaluated template contained uncalled functions')
return rv
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