from score.tpl import Renderer
import sass
import os
import hashlib
[docs]class SassRenderer(Renderer):
"""
:class:`score.tpl.Renderer` for scss (and sass) files.
"""
def __init__(self, sass_conf, *args, **kwargs):
self._sass_conf = sass_conf
super().__init__(*args, **kwargs)
def render_string(self, string, variables, path=None):
if path and self._sass_conf.cachedir:
cached_result = self._load_cache(path, variables)
if cached_result is not None:
return cached_result
functions = dict((name, value)
for name, value in variables.items()
if callable(value))
functions.update((name, value)
for name, value, _ in self.filetype.globals
if callable(value))
result = sass.compile(string=string,
include_paths=self._tpl_conf.rootdirs,
output_style='expanded',
source_comments='line_numbers',
custom_functions=functions)
# Remove BOM from output:
# https://github.com/dahlia/libsass-python/pull/52
if result.startswith('\ufeff'):
result = result[1:]
if path and self._sass_conf.cachedir:
self._cache(path, variables, result)
return result
def render_file(self, file, variables, path=None):
if path and self._sass_conf.cachedir:
cached_result = self._load_cache(path, variables)
if cached_result is not None:
return cached_result
functions = dict((name, value)
for name, value in variables.items()
if callable(value))
functions.update((name, value)
for name, value, _ in self.filetype.globals
if callable(value))
result = sass.compile(filename=file,
include_paths=self._tpl_conf.rootdirs,
output_style='expanded',
source_comments='line_numbers',
custom_functions=functions)
# Remove BOM from output:
# https://github.com/dahlia/libsass-python/pull/52
if result.startswith('\ufeff'):
result = result[1:]
if path and self._sass_conf.cachedir:
self._cache(path, variables, result)
return result
def _cache(self, path, variables, content):
cachefile = self._cache_file(path, variables)
os.makedirs(os.path.dirname(cachefile), exist_ok=True)
open(cachefile, 'w').write(content)
def _load_cache(self, path, variables):
cachefile = self._cache_file(path, variables)
try:
return open(cachefile).read()
except FileNotFoundError:
return None
def _cache_file(self, path, variables):
cachefile = os.path.join(self._sass_conf.cachedir, path)
if variables:
variables_hash = hashlib.sha256(str(variables)).hexdigest()
cachefile = os.path.join(cachefile, variables_hash)
return cachefile
