forked from 5monkeys/djedi-cms-jinja2
/
djedi_jinja.py
193 lines (156 loc) · 5.77 KB
/
djedi_jinja.py
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"""Jinja2 implementations of the Djedi template tags."""
import hashlib
import textwrap
import cio
from djedi.templatetags.djedi_tags import render_node
from jinja2 import Markup, nodes
from jinja2.ext import Extension
from jinja2.lexer import Token
__all__ = ['NodeExtension', 'node']
__version__ = '2.0.1'
__author__ = 'Christopher Rosell <chrippa@5monkeys.se>'
__authors__ = ['Christopher Rosell', 'Andrei Fokau']
DJEDI_TAG = 'node'
DJEDI_BLOCK_TAG = 'blocknode'
DJEDI_INIT_TAG = '__djedi__init__'
DJEDI_NODE_STORAGE = '__djedi_nodes__'
class Builtin(object):
def __init__(self, name):
self.name = name
def __repr__(self):
return self.name
DJEDI_NODE_STORAGE_NODE = (
nodes.If(
# if not isinstance(DJEDI_NODE_STORAGE, dict):
nodes.Not(
nodes.Call(
nodes.Const(Builtin('isinstance')),
[
nodes.Name(DJEDI_NODE_STORAGE, 'load'),
nodes.Const(Builtin('dict')),
], [], None, None
)
),
# DJEDI_NODE_STORAGE = {}
[
nodes.Assign(
nodes.Name(DJEDI_NODE_STORAGE, 'store'),
nodes.Dict([])
),
],
# else: pass
[]
)
)
class NodeExtension(Extension):
tags = set([DJEDI_INIT_TAG, DJEDI_TAG, DJEDI_BLOCK_TAG])
def create_node_id(self, uri, default):
m = hashlib.sha256()
m.update(uri.encode('utf8'))
if default:
m.update(default.encode('utf8'))
return m.hexdigest()
def create_tuple(self, *values, **kwargs):
ctx = kwargs.get('ctx', 'local')
node = kwargs.get('node', nodes.Const)
node_args = kwargs.get('node_args', [])
values = [node(v, *node_args) if isinstance(v, str) else v for v in values]
return nodes.Tuple(values, ctx)
def create_node_storage(self):
# Keep reference to allow adding nodes during parsing
self._node_storage = []
create_nodes = nodes.Assign(
nodes.Name('__', 'local'),
self.call_method(
'_create_nodes',
[
nodes.Name(DJEDI_NODE_STORAGE, 'load'),
nodes.List(self._node_storage),
]
)
)
return [DJEDI_NODE_STORAGE_NODE, create_nodes]
def parse_params(self, parser):
params = {}
while parser.stream.current.type != 'block_end':
if params:
parser.stream.expect('comma')
target = parser.parse_assign_target(name_only=True)
parser.stream.expect('assign')
params[target.name] = parser.parse_expression()
return params
def filter_stream(self, stream):
djedi_init = [
Token(0, 'block_begin', '{%'),
Token(0, 'name', DJEDI_INIT_TAG),
Token(0, 'block_end', '%}'),
Token(0, 'data', '\n')
]
for token in djedi_init:
yield token
for token in stream:
yield token
def buffer_node(self, parser, uri, default):
node_id = self.create_node_id(uri.value, default.value)
for node in self._node_storage:
if node.items[0].value == node_id:
break
else:
self._node_storage.append(self.create_tuple(node_id, uri, default))
return nodes.Getitem(
nodes.Name(DJEDI_NODE_STORAGE, 'load'),
nodes.Const(node_id),
None
)
def parse(self, parser):
# Tag information
token = next(parser.stream)
lineno = token.lineno
tag = token.value
if tag == DJEDI_INIT_TAG:
return [node.set_lineno(lineno) for node in self.create_node_storage()]
# Parse arguments
uri = parser.parse_expression()
params = self.parse_params(parser)
body = []
# If this is a blocknode, parse the body too.
if tag == DJEDI_BLOCK_TAG:
body = parser.parse_statements(['name:end{}'.format(DJEDI_BLOCK_TAG)], drop_needle=True)
if body:
default = body[0].nodes[0].data.rstrip('\n\r ')
default = textwrap.dedent(default)
default = nodes.Const(default)
else:
default = nodes.Const(None)
else:
default = params.pop('default', nodes.Const(None))
edit = params.pop('edit', nodes.Const(True))
# If we got passed const values, we can buffer nodes before render.
can_buffer = all([isinstance(n, nodes.Const) for n in (uri, default)])
if can_buffer:
node_or_uri = self.buffer_node(parser, uri, default)
else:
node_or_uri = uri
params_dict = nodes.Dict([
nodes.Pair(nodes.Const(key), value)
for key, value in params.items()
])
args = [node_or_uri, default, edit, params_dict, nodes.Const(tag)]
return nodes.CallBlock(
self.call_method('_render_node', args=args),
[], [], body
).set_lineno(lineno)
def _create_nodes(self, nodes, local_nodes):
for node_id, uri, default in local_nodes:
if node_id not in nodes:
nodes[node_id] = cio.get(uri, default=default or '')
def _render_node(self, node_or_uri, default, edit, params, tag, caller):
if isinstance(node_or_uri, str):
node = cio.get(node_or_uri, default=default, lazy=False)
else:
node = node_or_uri
return Markup(render_node(node, edit=edit, context=params))
def node(uri, default=None, edit=True, context=None):
"""Function that renders a Djedi node."""
node = cio.get(uri, default=default or u'', lazy=False)
return Markup(render_node(node, edit=edit, context=context))