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from __future__ import absolute_import, unicode_literals
import os
from itertools import product
import errno
from django.contrib.staticfiles.storage import staticfiles_storage
from django.conf import settings
from scss import (
Scss, dequote, log, SourceFile, SassRule, config,
)
from django_pyscss.utils import find_all_files
# TODO: It's really gross to modify this global settings variable.
# This is where PyScss is supposed to find the image files for making sprites.
config.STATIC_ROOT = find_all_files
config.STATIC_URL = staticfiles_storage.url('scss/')
# This is where PyScss places the sprite files.
config.ASSETS_ROOT = os.path.join(settings.STATIC_ROOT, 'scss', 'assets')
# PyScss expects a trailing slash.
config.ASSETS_URL = staticfiles_storage.url('scss/assets/')
def idempotent_makedirs(path, *args, **kwargs):
"""
os.makedirs throws an error if the directory already existed. This function
does not. See https://github.com/fusionbox/django-pyscss/issues/23
"""
try:
os.makedirs(path, *args, **kwargs)
except OSError as e:
if e.errno != errno.EEXIST:
raise
class DjangoScss(Scss):
"""
A subclass of the Scss compiler that uses the storages API for accessing
files.
"""
supported_extensions = ['.scss', '.sass', '.css']
def get_file_from_storage(self, filename):
try:
filename = staticfiles_storage.path(filename)
except NotImplementedError:
# remote storages don't implement path
pass
if staticfiles_storage.exists(filename):
return filename, staticfiles_storage
else:
return None, None
def get_file_from_finders(self, filename):
for file_and_storage in find_all_files(filename):
return file_and_storage
return None, None
def get_file_and_storage(self, filename):
# TODO: the switch probably shouldn't be on DEBUG
if settings.DEBUG:
return self.get_file_from_finders(filename)
else:
return self.get_file_from_storage(filename)
def get_possible_import_paths(self, path, relative_to=None):
"""
Returns an iterable of possible paths for an import.
relative_to is None in the case that the SCSS is being rendered from a
string or if it is the first file.
"""
paths = []
if path.startswith('/'): # absolute import
path = path[1:]
elif relative_to: # relative import
path = os.path.join(relative_to, path)
dirname, filename = os.path.split(path)
name, ext = os.path.splitext(filename)
if ext:
search_exts = [ext]
else:
search_exts = self.supported_extensions
for prefix, suffix in product(('_', ''), search_exts):
paths.append(os.path.join(dirname, prefix + name + suffix))
paths.append(path)
return paths
def _find_source_file(self, filename, relative_to=None):
paths = self.get_possible_import_paths(filename, relative_to)
log.debug('Searching for %s in %s', filename, paths)
for name in paths:
full_filename, storage = self.get_file_and_storage(name)
if full_filename:
if full_filename not in self.source_file_index:
with storage.open(full_filename) as f:
source = f.read()
source_file = SourceFile(
full_filename,
source,
)
# SourceFile.__init__ calls os.path.realpath on this, we don't want
# that, we want them to remain relative.
source_file.parent_dir = os.path.dirname(name)
self.source_files.append(source_file)
self.source_file_index[full_filename] = source_file
return self.source_file_index[full_filename]
def _do_import(self, rule, scope, block):
"""
Implements @import using the django storages API.
"""
# Protect against going to prohibited places...
if any(scary_token in block.argument for scary_token in ('..', '://', 'url(')):
rule.properties.append((block.prop, None))
return
full_filename = None
names = block.argument.split(',')
for name in names:
name = dequote(name.strip())
relative_to = rule.source_file.parent_dir
source_file = self._find_source_file(name, relative_to)
if source_file is None:
i_codestr = self._do_magic_import(rule, scope, block)
if i_codestr is not None:
source_file = SourceFile.from_string(i_codestr)
self.source_files.append(source_file)
self.source_file_index[full_filename] = source_file
if source_file is None:
log.warn("File to import not found or unreadable: '%s' (%s)", name, rule.file_and_line)
continue
import_key = (name, source_file.parent_dir)
if rule.namespace.has_import(import_key):
# If already imported in this scope, skip
continue
_rule = SassRule(
source_file=source_file,
lineno=block.lineno,
import_key=import_key,
unparsed_contents=source_file.contents,
# rule
options=rule.options,
properties=rule.properties,
extends_selectors=rule.extends_selectors,
ancestry=rule.ancestry,
namespace=rule.namespace,
)
rule.namespace.add_import(import_key, rule.import_key, rule.file_and_line)
self.manage_children(_rule, scope)
def Compilation(self, scss_string=None, scss_file=None, super_selector=None,
filename=None, is_sass=None, line_numbers=True,
relative_to=None):
"""
Overwritten to call _find_source_file instead of
SourceFile.from_filename. Also added the relative_to option.
"""
idempotent_makedirs(config.ASSETS_ROOT)
if super_selector:
self.super_selector = super_selector + ' '
self.reset()
source_file = None
if scss_string is not None:
source_file = SourceFile.from_string(scss_string, filename, is_sass, line_numbers)
# Set the parent_dir to be something meaningful instead of the
# current working directory, which is never correct for DjangoScss.
source_file.parent_dir = relative_to
elif scss_file is not None:
# Call _find_source_file instead of SourceFile.from_filename
source_file = self._find_source_file(scss_file)
if source_file is not None:
# Clear the existing list of files
self.source_files = []
self.source_file_index = dict()
self.source_files.append(source_file)
self.source_file_index[source_file.filename] = source_file
# this will compile and manage rule: child objects inside of a node
self.parse_children()
# this will manage @extends
self.apply_extends()
rules_by_file, css_files = self.parse_properties()
all_rules = 0
all_selectors = 0
exceeded = ''
final_cont = ''
files = len(css_files)
for source_file in css_files:
rules = rules_by_file[source_file]
fcont, total_rules, total_selectors = self.create_css(rules)
all_rules += total_rules
all_selectors += total_selectors
if not exceeded and all_selectors > 4095:
exceeded = " (IE exceeded!)"
log.error("Maximum number of supported selectors in Internet Explorer (4095) exceeded!")
if files > 1 and self.scss_opts.get('debug_info', False):
if source_file.is_string:
final_cont += "/* %s %s generated add up to a total of %s %s accumulated%s */\n" % (
total_selectors,
'selector' if total_selectors == 1 else 'selectors',
all_selectors,
'selector' if all_selectors == 1 else 'selectors',
exceeded)
else:
final_cont += "/* %s %s generated from '%s' add up to a total of %s %s accumulated%s */\n" % (
total_selectors,
'selector' if total_selectors == 1 else 'selectors',
source_file.filename,
all_selectors,
'selector' if all_selectors == 1 else 'selectors',
exceeded)
final_cont += fcont
return final_cont
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