def read_at_rule(self, at_keyword_token, tokens):
"""Read an at-rule from a token stream.
:param at_keyword_token:
The ATKEYWORD token that starts this at-rule
You may have read it already to distinguish the rule
from a ruleset.
:param tokens:
An iterator of subsequent tokens. Will be consumed just enough
for one at-rule.
:return:
An unparsed :class:`AtRule`.
:raises:
:class:`~.parsing.ParseError` if the head is invalid for the core
grammar. The body is **not** validated. See :class:`AtRule`.
"""
# CSS syntax is case-insensitive
at_keyword = at_keyword_token.value.lower()
head = []
# For the ParseError in case `tokens` is empty:
token = at_keyword_token
for token in tokens:
if token.type in '{;':
break
# Ignore white space just after the at-keyword.
else:
head.append(token)
# On unexpected end of stylesheet, pretend that a ';' was there
head = strip_whitespace(head)
for head_token in head:
validate_any(head_token, 'at-rule head')
body = token.content if token.type == '{' else None
return AtRule(at_keyword, head, body,
at_keyword_token.line, at_keyword_token.column)
def read_at_rule(self, at_keyword_token, tokens):
"""Read an at-rule from a token stream.
:param at_keyword_token:
The ATKEYWORD token that starts this at-rule
You may have read it already to distinguish the rule
from a ruleset.
:param tokens:
An iterator of subsequent tokens. Will be consumed just enough
for one at-rule.
:return:
An unparsed :class:`AtRule`.
:raises:
:class:`~.parsing.ParseError` if the head is invalid for the core
grammar. The body is **not** validated. See :class:`AtRule`.
"""
# CSS syntax is case-insensitive
at_keyword = at_keyword_token.value.lower()
head = []
# For the ParseError in case `tokens` is empty:
token = at_keyword_token
for token in tokens:
if token.type in '{;':
break
# Ignore white space just after the at-keyword.
else:
head.append(token)
# On unexpected end of stylesheet, pretend that a ';' was there
head = strip_whitespace(head)
for head_token in head:
validate_any(head_token, 'at-rule head')
body = token.content if token.type == '{' else None
return AtRule(at_keyword, head, body,
at_keyword_token.line, at_keyword_token.column)
def parse_ruleset(self, first_token, tokens):
"""Parse a ruleset: a selector followed by declaration block.
:param first_token:
The first token of the ruleset (probably of the selector).
You may have read it already to distinguish the rule
from an at-rule.
:param tokens:
an iterator of subsequent tokens. Will be consumed just enough
for one ruleset.
:return:
a tuple of a :class:`RuleSet` and an error list.
The errors are recovered :class:`~.parsing.ParseError` in declarations.
(Parsing continues from the next declaration on such errors.)
:raises:
:class:`~.parsing.ParseError` if the selector is invalid for the
core grammar.
Note a that a selector can be valid for the core grammar but
not for CSS 2.1 or another level.
"""
selector = []
for token in chain([first_token], tokens):
if token.type == '{':
# Parse/validate once we’ve read the whole rule
selector = strip_whitespace(selector)
if not selector:
raise ParseError(first_token, 'empty selector')
for selector_token in selector:
validate_any(selector_token, 'selector')
declarations, errors = self.parse_declaration_list(
token.content)
ruleset = RuleSet(selector, declarations,
first_token.line, first_token.column)
return ruleset, errors
else:
selector.append(token)
raise ParseError(token, 'no declaration block found for ruleset')
def parse_ruleset(self, first_token, tokens):
"""Parse a ruleset: a selector followed by declaration block.
:param first_token:
The first token of the ruleset (probably of the selector).
You may have read it already to distinguish the rule
from an at-rule.
:param tokens:
an iterator of subsequent tokens. Will be consumed just enough
for one ruleset.
:return:
a tuple of a :class:`RuleSet` and an error list.
The errors are recovered :class:`~.parsing.ParseError` in declarations.
(Parsing continues from the next declaration on such errors.)
:raises:
:class:`~.parsing.ParseError` if the selector is invalid for the
core grammar.
Note a that a selector can be valid for the core grammar but
not for CSS 2.1 or another level.
"""
selector = []
for token in chain([first_token], tokens):
if token.type == '{':
# Parse/validate once we’ve read the whole rule
selector = strip_whitespace(selector)
if not selector:
raise ParseError(first_token, 'empty selector')
for selector_token in selector:
validate_any(selector_token, 'selector')
declarations, errors = self.parse_declaration_list(
token.content)
ruleset = RuleSet(selector, declarations,
first_token.line, first_token.column)
return ruleset, errors
else:
selector.append(token)
raise ParseError(token, 'no declaration block found for ruleset')