/usr/lib/python2.7/dist-packages/scss/rule.py is in python-pyscss 1.3.5-2build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from __future__ import print_function
from __future__ import unicode_literals
import logging
import re
from scss.namespace import Namespace
log = logging.getLogger(__name__)
SORTED_SELECTORS = False
sort = sorted if SORTED_SELECTORS else lambda it: it
def extend_unique(seq, more):
"""Return a new sequence containing the items in `seq` plus any items in
`more` that aren't already in `seq`, preserving the order of both.
"""
seen = set(seq)
new = []
for item in more:
if item not in seen:
seen.add(item)
new.append(item)
return seq + type(seq)(new)
class SassRule(object):
"""At its heart, a CSS rule: combination of a selector and zero or more
properties. But this is Sass, so it also tracks some Sass-flavored
metadata, like `@extend` rules and `@media` nesting.
"""
def __init__(
self, source_file, import_key=None, unparsed_contents=None,
num_header_lines=0,
options=None, legacy_compiler_options=None, properties=None,
namespace=None,
lineno=0, extends_selectors=frozenset(),
ancestry=None,
nested=0,
from_source_file=None, from_lineno=0):
self.from_source_file = from_source_file
self.from_lineno = from_lineno
self.source_file = source_file
self.import_key = import_key
self.lineno = lineno
self.num_header_lines = num_header_lines
self.unparsed_contents = unparsed_contents
self.legacy_compiler_options = legacy_compiler_options or {}
self.options = options or {}
self.extends_selectors = extends_selectors
if namespace is None:
assert False
self.namespace = Namespace()
else:
self.namespace = namespace
if properties is None:
self.properties = []
else:
self.properties = properties
if ancestry is None:
self.ancestry = RuleAncestry()
else:
self.ancestry = ancestry
self.nested = nested
self.descendants = 0
def __repr__(self):
# TODO probably want to encode this with string_escape on python 2, and
# similar elsewhere, especially since this file has unicode_literals
return "<SassRule %s, %d props>" % (
self.ancestry,
len(self.properties),
)
@property
def selectors(self):
# TEMPORARY
if self.ancestry.headers and self.ancestry.headers[-1].is_selector:
return self.ancestry.headers[-1].selectors
else:
return ()
@property
def file_and_line(self):
"""Return the filename and line number where this rule originally
appears, in the form "foo.scss:3". Used for error messages.
"""
ret = "%s:%d" % (self.source_file.path, self.lineno)
if self.from_source_file:
ret += " (%s:%d)" % (self.from_source_file.path, self.from_lineno)
return ret
@property
def is_empty(self):
"""Return whether this rule is considered "empty" -- i.e., has no
contents that should end up in the final CSS.
"""
if self.properties:
# Rules containing CSS properties are never empty
return False
if not self.descendants:
for header in self.ancestry.headers:
if header.is_atrule and header.directive != '@media':
# At-rules should always be preserved, UNLESS they are @media
# blocks, which are known to be noise if they don't have any
# contents of their own
return False
return True
@property
def is_pure_placeholder(self):
selectors = self.selectors
if not selectors:
return False
for s in selectors:
if not s.has_placeholder:
return False
return True
def copy(self):
return type(self)(
source_file=self.source_file,
lineno=self.lineno,
from_source_file=self.from_source_file,
from_lineno=self.from_lineno,
unparsed_contents=self.unparsed_contents,
legacy_compiler_options=self.legacy_compiler_options,
options=self.options,
#properties=list(self.properties),
properties=self.properties,
extends_selectors=self.extends_selectors,
#ancestry=list(self.ancestry),
ancestry=self.ancestry,
namespace=self.namespace.derive(),
nested=self.nested,
)
class RuleAncestry(object):
def __init__(self, headers=()):
self.headers = tuple(headers)
def __repr__(self):
return "<%s %r>" % (type(self).__name__, self.headers)
def __len__(self):
return len(self.headers)
def with_nested_selectors(self, c_selectors):
if self.headers and self.headers[-1].is_selector:
# Need to merge with parent selectors
p_selectors = self.headers[-1].selectors
new_selectors = []
for p_selector in p_selectors:
for c_selector in c_selectors:
new_selectors.append(c_selector.with_parent(p_selector))
# Replace the last header with the new merged selectors
new_headers = self.headers[:-1] + (BlockSelectorHeader(new_selectors),)
return RuleAncestry(new_headers)
else:
# Whoops, no parent selectors. Just need to double-check that
# there are no uses of `&`.
for c_selector in c_selectors:
if c_selector.has_parent_reference:
raise ValueError("Can't use parent selector '&' in top-level rules")
# Add the children as a new header
new_headers = self.headers + (BlockSelectorHeader(c_selectors),)
return RuleAncestry(new_headers)
def with_more_selectors(self, selectors):
"""Return a new ancestry that also matches the given selectors. No
nesting is done.
"""
if self.headers and self.headers[-1].is_selector:
new_selectors = extend_unique(
self.headers[-1].selectors,
selectors)
new_headers = self.headers[:-1] + (
BlockSelectorHeader(new_selectors),)
return RuleAncestry(new_headers)
else:
new_headers = self.headers + (BlockSelectorHeader(selectors),)
return RuleAncestry(new_headers)
class BlockHeader(object):
"""..."""
# TODO doc me depending on how UnparsedBlock is handled...
is_atrule = False
is_scope = False
is_selector = False
@classmethod
def parse(cls, prop, has_contents=False):
num_lines = prop.count('\n')
prop = prop.strip()
# Simple pre-processing
if prop.startswith('+') and not has_contents:
# Expand '+' at the beginning of a rule as @include. But not if
# there's a block, because that's probably a CSS selector.
# DEVIATION: this is some semi hybrid of Sass and xCSS syntax
prop = '@include ' + prop[1:]
try:
if '(' not in prop or prop.index(':') < prop.index('('):
prop = prop.replace(':', '(', 1)
if '(' in prop:
prop += ')'
except ValueError:
pass
elif prop.startswith('='):
# Expand '=' at the beginning of a rule as @mixin
prop = '@mixin ' + prop[1:]
elif prop.startswith('@prototype '):
# Remove '@prototype '
# TODO what is @prototype??
prop = prop[11:]
# Minor parsing
if prop.startswith('@'):
# This pattern MUST NOT BE ABLE TO FAIL!
# This is slightly more lax than the CSS syntax technically allows,
# e.g. identifiers aren't supposed to begin with three hyphens.
# But we don't care, and will just spit it back out anyway.
m = re.match(
'@(else if|[-_a-zA-Z0-9\U00000080-\U0010FFFF]*)\\b',
prop, re.I)
directive = m.group(0).lower()
argument = prop[len(directive):].strip()
if not argument:
argument = None
return BlockAtRuleHeader(directive, argument, num_lines)
elif prop.split(None, 1)[0].endswith(':'):
# Syntax is "<scope>: [prop]" -- if the optional prop exists, it
# becomes the first rule with no suffix
scope, unscoped_value = prop.split(':', 1)
scope = scope.rstrip()
unscoped_value = unscoped_value.lstrip()
return BlockScopeHeader(scope, unscoped_value, num_lines)
else:
return BlockSelectorHeader(prop, num_lines)
class BlockAtRuleHeader(BlockHeader):
is_atrule = True
def __init__(self, directive, argument, num_lines=0):
self.directive = directive
self.argument = argument
self.num_lines = num_lines
def __repr__(self):
return "<%s %r %r>" % (type(self).__name__, self.directive, self.argument)
def render(self):
if self.argument:
return "%s %s" % (self.directive, self.argument)
else:
return self.directive
class BlockSelectorHeader(BlockHeader):
is_selector = True
def __init__(self, selectors, num_lines=0):
self.selectors = tuple(selectors)
self.num_lines = num_lines
def __repr__(self):
return "<%s %r>" % (type(self).__name__, self.selectors)
def render(self, sep=', ', super_selector=''):
return sep.join(sort(
super_selector + s.render()
for s in self.selectors
if not s.has_placeholder))
class BlockScopeHeader(BlockHeader):
is_scope = True
def __init__(self, scope, unscoped_value, num_lines=0):
self.scope = scope
if unscoped_value:
self.unscoped_value = unscoped_value
else:
self.unscoped_value = None
self.num_lines = num_lines
class UnparsedBlock(object):
"""A Sass block whose contents have not yet been parsed.
At the top level, CSS (and Sass) documents consist of a sequence of blocks.
A block may be a ruleset:
selector { block; block; block... }
Or it may be an @-rule:
@rule arguments { block; block; block... }
Or it may be only a single property declaration:
property: value
pyScss's first parsing pass breaks the document into these blocks, and each
block becomes an instance of this class.
"""
def __init__(self, parent_rule, lineno, prop, unparsed_contents):
self.parent_rule = parent_rule
self.header = BlockHeader.parse(prop, has_contents=bool(unparsed_contents))
# Basic properties
self.lineno = (
parent_rule.lineno - parent_rule.num_header_lines + lineno - 1)
self.prop = prop
self.unparsed_contents = unparsed_contents
@property
def directive(self):
return self.header.directive
@property
def argument(self):
return self.header.argument
### What kind of thing is this?
@property
def is_atrule(self):
return self.header.is_atrule
@property
def is_scope(self):
return self.header.is_scope
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