mirror of
https://github.com/Kozea/WeasyPrint.git
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7a4faac087
Since we have no scrolling mechanism, local and scroll are treated the same.
1423 lines
43 KiB
Python
1423 lines
43 KiB
Python
# coding: utf8
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"""
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weasyprint.css.validation
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-------------------------
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Expand shorthands and validate property values.
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See http://www.w3.org/TR/CSS21/propidx.html and various CSS3 modules.
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:copyright: Copyright 2011-2012 Simon Sapin and contributors, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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from __future__ import division, unicode_literals
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import functools
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from tinycss.color3 import parse_color
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from tinycss.parsing import split_on_comma, remove_whitespace
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from ..logger import LOGGER
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from ..formatting_structure import counters
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from ..compat import urljoin, unquote
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from ..urls import url_is_absolute, iri_to_uri
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from .properties import (INITIAL_VALUES, KNOWN_PROPERTIES, NOT_PRINT_MEDIA,
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Dimension)
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from . import computed_values
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# TODO: unit-test these validators
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# get the sets of keys
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LENGTH_UNITS = set(computed_values.LENGTHS_TO_PIXELS) | set(['ex', 'em'])
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ANGLE_UNITS = set(computed_values.ANGLE_TO_RADIANS)
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# keyword -> (open, insert)
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CONTENT_QUOTE_KEYWORDS = {
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'open-quote': (True, True),
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'close-quote': (False, True),
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'no-open-quote': (True, False),
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'no-close-quote': (False, False),
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}
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BACKGROUND_POSITION_PERCENTAGES = {
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'top': Dimension(0, '%'),
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'left': Dimension(0, '%'),
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'center': Dimension(50, '%'),
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'bottom': Dimension(100, '%'),
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'right': Dimension(100, '%'),
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}
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# yes/no validators for non-shorthand properties
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# Maps property names to functions taking a property name and a value list,
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# returning a value or None for invalid.
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# Also transform values: keyword and URLs are returned as strings.
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# For properties that take a single value, that value is returned by itself
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# instead of a list.
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VALIDATORS = {}
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EXPANDERS = {}
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PREFIXED = set()
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UNPREFIXED = set()
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PREFIX = '-weasy-'
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class InvalidValues(ValueError):
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"""Invalid or unsupported values for a known CSS property."""
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# Validators
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def validator(property_name=None, prefixed=False, unprefixed=False,
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wants_base_url=False):
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"""Decorator adding a function to the ``VALIDATORS``.
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The name of the property covered by the decorated function is set to
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``property_name`` if given, or is inferred from the function name
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(replacing underscores by hyphens).
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:param prefixed:
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Vendor-specific (non-standard) and experimental properties are
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prefixed: stylesheets need to use eg. ``-weasy-bookmark-level: 2``
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instead of ``bookmark-level: 2``.
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See http://wiki.csswg.org/spec/vendor-prefixes
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:param unprefixed:
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Mark properties that used to be prefixed. When used with the prefix,
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they will be ignored be give a specific warning.
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:param wants_base_url:
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The function takes the stylesheet’s base URL as an additional
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parameter.
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"""
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assert not (prefixed and unprefixed)
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def decorator(function):
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"""Add ``function`` to the ``VALIDATORS``."""
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if property_name is None:
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name = function.__name__.replace('_', '-')
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else:
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name = property_name
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assert name in KNOWN_PROPERTIES, name
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assert name not in VALIDATORS, name
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function.wants_base_url = wants_base_url
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VALIDATORS[name] = function
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if prefixed:
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PREFIXED.add(name)
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if unprefixed:
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UNPREFIXED.add(name)
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return function
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return decorator
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def get_keyword(token):
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"""If ``value`` is a keyword, return its name.
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Otherwise return ``None``.
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"""
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if token.type == 'IDENT':
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return token.value.lower()
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def get_single_keyword(tokens):
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"""If ``values`` is a 1-element list of keywords, return its name.
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Otherwise return ``None``.
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"""
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if len(tokens) == 1:
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token = tokens[0]
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if token.type == 'IDENT':
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return token.value.lower()
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def single_keyword(function):
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"""Decorator for validators that only accept a single keyword."""
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@functools.wraps(function)
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def keyword_validator(tokens):
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"""Wrap a validator to call get_single_keyword on tokens."""
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keyword = get_single_keyword(tokens)
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if function(keyword):
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return keyword
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return keyword_validator
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def single_token(function):
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"""Decorator for validators that only accept a single token."""
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@functools.wraps(function)
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def single_token_validator(tokens, *args):
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"""Validate a property whose token is single."""
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if len(tokens) == 1:
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return function(tokens[0], *args)
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single_token_validator.__func__ = function
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return single_token_validator
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def comma_separated_list(function):
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"""Decorator for validators that accept a comma separated list."""
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@functools.wraps(function)
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def wrapper(tokens, *args):
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results = []
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for part in split_on_comma(tokens):
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result = function(remove_whitespace(part), *args)
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if result is None:
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return None
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results.append(result)
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return results
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wrapper.single_value = function
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return wrapper
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def get_length(token, negative=True, percentage=False):
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if (token.unit in LENGTH_UNITS or (percentage and token.unit == '%')
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or (token.type in ('INTEGER', 'NUMBER') and token.value == 0)
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) and (negative or token.value >= 0):
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return Dimension(token.value, token.unit)
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def get_angle(token):
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"""Return whether the argument is an angle token."""
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if token.unit in ANGLE_UNITS:
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return Dimension(token.value, token.unit)
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def safe_urljoin(base_url, url):
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if url_is_absolute(url):
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return iri_to_uri(url)
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elif base_url:
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return iri_to_uri(urljoin(base_url, url))
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else:
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raise InvalidValues(
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'Relative URI reference without a base URI: %r' % url)
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@validator()
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@comma_separated_list
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@single_keyword
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def background_attachment(keyword):
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"""``background-attachment`` property validation."""
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return keyword in ('scroll', 'fixed', 'local')
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@validator('background-color')
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@validator('border-top-color')
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@validator('border-right-color')
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@validator('border-bottom-color')
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@validator('border-left-color')
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@single_token
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def other_colors(token):
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return parse_color(token)
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@validator()
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@single_token
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def outline_color(token):
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if get_keyword(token) == 'invert':
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return 'currentColor'
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else:
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return parse_color(token)
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@validator()
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@single_keyword
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def border_collapse(keyword):
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return keyword in ('separate', 'collapse')
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@validator('color')
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@single_token
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def color(token):
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"""``*-color`` and ``color`` properties validation."""
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result = parse_color(token)
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if result == 'currentColor':
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return 'inherit'
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else:
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return result
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@validator('background-image', wants_base_url=True)
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@comma_separated_list
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@validator('list-style-image', wants_base_url=True)
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@single_token
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def image(token, base_url):
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"""``*-image`` properties validation."""
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if get_keyword(token) == 'none':
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return 'none'
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if token.type == 'URI':
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return safe_urljoin(base_url, token.value)
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@validator()
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@comma_separated_list
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@validator('transform-origin', unprefixed=True)
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def background_position(tokens):
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"""``background-position`` property validation.
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See http://www.w3.org/TR/CSS21/colors.html#propdef-background-position
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"""
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if len(tokens) == 1:
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center = BACKGROUND_POSITION_PERCENTAGES['center']
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token = tokens[0]
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keyword = get_keyword(token)
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if keyword in BACKGROUND_POSITION_PERCENTAGES:
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return BACKGROUND_POSITION_PERCENTAGES[keyword], center
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else:
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length = get_length(token, percentage=True)
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if length:
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return length, center
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elif len(tokens) == 2:
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token_1, token_2 = tokens
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keyword_1, keyword_2 = map(get_keyword, tokens)
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length_1 = get_length(token_1, percentage=True)
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if length_1:
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if keyword_2 in ('top', 'center', 'bottom'):
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return length_1, BACKGROUND_POSITION_PERCENTAGES[keyword_2]
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length_2 = get_length(token_2, percentage=True)
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if length_2:
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return length_1, length_2
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return None # invalid
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length_2 = get_length(token_2, percentage=True)
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if length_2:
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if keyword_1 in ('left', 'center', 'right'):
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return BACKGROUND_POSITION_PERCENTAGES[keyword_1], length_2
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elif (keyword_1 in ('left', 'center', 'right') and
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keyword_2 in ('top', 'center', 'bottom')):
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return (BACKGROUND_POSITION_PERCENTAGES[keyword_1],
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BACKGROUND_POSITION_PERCENTAGES[keyword_2])
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elif (keyword_1 in ('top', 'center', 'bottom') and
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keyword_2 in ('left', 'center', 'right')):
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# Swap tokens. They need to be in (horizontal, vertical) order.
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return (BACKGROUND_POSITION_PERCENTAGES[keyword_2],
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BACKGROUND_POSITION_PERCENTAGES[keyword_1])
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#else: invalid
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@validator()
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@comma_separated_list
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@single_keyword
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def background_repeat(keyword):
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"""``background-repeat`` property validation."""
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return keyword in ('repeat', 'repeat-x', 'repeat-y', 'no-repeat')
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@validator()
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@comma_separated_list
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def background_size(tokens):
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"""Validation for ``background-size``."""
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if len(tokens) == 1:
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token = tokens[0]
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keyword = get_keyword(token)
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if keyword in ('contain', 'cover'):
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return keyword
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if keyword == 'auto':
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return ('auto', 'auto')
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length = get_length(token, negative=False)
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if length:
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return (length, 'auto')
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elif len(tokens) == 2:
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values = []
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for token in tokens:
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if get_keyword(token) == 'auto':
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values.append('auto')
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else:
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length = get_length(token, negative=False)
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if length:
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values.append(token)
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if len(values) == 2:
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return tuple(values)
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@validator('background-clip')
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@validator('background-origin')
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@comma_separated_list
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@single_keyword
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def box(keyword):
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"""Validation for the ``<box>`` type used in ``background-clip``
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and ``background-origin``."""
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return keyword in ('border-box', 'padding-box', 'content-box')
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@validator()
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def border_spacing(tokens):
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"""Validator for the `border-spacing` property."""
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lengths = [get_length(token, negative=False) for token in tokens]
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if all(lengths):
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if len(lengths) == 1:
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return (lengths[0], lengths[0])
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elif len(lengths) == 2:
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return tuple(lengths)
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@validator('border-top-style')
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@validator('border-right-style')
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@validator('border-left-style')
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@validator('border-bottom-style')
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@validator('outline-style')
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@single_keyword
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def border_style(keyword):
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"""``border-*-style`` properties validation."""
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return keyword in ('none', 'hidden', 'dotted', 'dashed', 'double',
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'inset', 'outset', 'groove', 'ridge', 'solid')
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@validator('border-top-width')
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@validator('border-right-width')
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@validator('border-left-width')
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@validator('border-bottom-width')
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@validator('outline-width')
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@single_token
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def border_width(token):
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"""``border-*-width`` properties validation."""
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length = get_length(token, negative=False)
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if length:
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return length
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keyword = get_keyword(token)
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if keyword in ('thin', 'medium', 'thick'):
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return keyword
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@validator()
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@single_keyword
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def box_sizing(keyword):
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"""Validation for the ``box-sizing`` property from css3-ui"""
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return keyword in ('padding-box', 'border-box', 'content-box')
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@validator()
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@single_keyword
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def caption_side(keyword):
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"""``caption-side`` properties validation."""
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return keyword in ('top', 'bottom')
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@validator()
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@single_keyword
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def clear(keyword):
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"""``clear`` property validation."""
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return keyword in ('left', 'right', 'both', 'none')
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@validator()
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@single_token
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def clip(token):
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"""Validation for the ``clip`` property."""
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function = parse_function(token)
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if function:
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name, args = function
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if name == 'rect' and len(args) == 4:
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values = []
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for arg in args:
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if get_keyword(arg) == 'auto':
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values.append('auto')
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else:
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length = get_length(arg)
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if length:
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values.append(length)
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if len(values) == 4:
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return values
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if get_keyword(token) == 'auto':
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return []
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||
|
||
|
||
@validator(wants_base_url=True)
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def content(tokens, base_url):
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"""``content`` property validation."""
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keyword = get_single_keyword(tokens)
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if keyword in ('normal', 'none'):
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return keyword
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parsed_tokens = [validate_content_token(base_url, v) for v in tokens]
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||
if None not in parsed_tokens:
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||
return parsed_tokens
|
||
|
||
|
||
def validate_content_token(base_url, token):
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||
"""Validation for a signle token for the ``content`` property.
|
||
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||
Return (type, content) or False for invalid tokens.
|
||
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||
"""
|
||
quote_type = CONTENT_QUOTE_KEYWORDS.get(get_keyword(token))
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if quote_type is not None:
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return ('QUOTE', quote_type)
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||
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type_ = token.type
|
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if type_ == 'STRING':
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return ('STRING', token.value)
|
||
if type_ == 'URI':
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return ('URI', safe_urljoin(base_url, token.value))
|
||
function = parse_function(token)
|
||
if function:
|
||
name, args = function
|
||
prototype = (name, [a.type for a in args])
|
||
args = [a.value for a in args]
|
||
if prototype == ('attr', ['IDENT']):
|
||
return (name, args[0])
|
||
elif prototype in (('counter', ['IDENT']),
|
||
('counters', ['IDENT', 'STRING'])):
|
||
args.append('decimal')
|
||
return (name, args)
|
||
elif prototype in (('counter', ['IDENT', 'IDENT']),
|
||
('counters', ['IDENT', 'STRING', 'IDENT'])):
|
||
style = args[-1]
|
||
if style in ('none', 'decimal') or style in counters.STYLES:
|
||
return (name, args)
|
||
|
||
|
||
def parse_function(function_token):
|
||
"""Return ``(name, args)`` if the given token is a function
|
||
with comma-separated arguments, or None.
|
||
.
|
||
"""
|
||
if function_token.type == 'FUNCTION':
|
||
content = [t for t in function_token.content if t.type != 'S']
|
||
if len(content) % 2:
|
||
for token in content[1::2]:
|
||
if token.type != 'DELIM' or token.value != ',':
|
||
break
|
||
else:
|
||
return function_token.function_name.lower(), content[::2]
|
||
|
||
|
||
@validator()
|
||
def counter_increment(tokens):
|
||
"""``counter-increment`` property validation."""
|
||
return counter(tokens, default_integer=1)
|
||
|
||
|
||
@validator()
|
||
def counter_reset(tokens):
|
||
"""``counter-reset`` property validation."""
|
||
return counter(tokens, default_integer=0)
|
||
|
||
|
||
def counter(tokens, default_integer):
|
||
"""``counter-increment`` and ``counter-reset`` properties validation."""
|
||
if get_single_keyword(tokens) == 'none':
|
||
return []
|
||
tokens = iter(tokens)
|
||
token = next(tokens, None)
|
||
assert token, 'got an empty token list'
|
||
results = []
|
||
while token is not None:
|
||
counter_name = get_keyword(token)
|
||
if counter_name is None:
|
||
return # expected a keyword here
|
||
if counter_name in ('none', 'initial', 'inherit'):
|
||
raise InvalidValues('Invalid counter name: ' + counter_name)
|
||
token = next(tokens, None)
|
||
if token is not None and token.type == 'INTEGER':
|
||
# Found an integer. Use it and get the next token
|
||
integer = token.value
|
||
token = next(tokens, None)
|
||
else:
|
||
# Not an integer. Might be the next counter name.
|
||
# Keep `token` for the next loop iteration.
|
||
integer = default_integer
|
||
results.append((counter_name, integer))
|
||
return results
|
||
|
||
|
||
@validator('top')
|
||
@validator('right')
|
||
@validator('left')
|
||
@validator('bottom')
|
||
@validator('margin-top')
|
||
@validator('margin-right')
|
||
@validator('margin-bottom')
|
||
@validator('margin-left')
|
||
@single_token
|
||
def lenght_precentage_or_auto(token):
|
||
"""``margin-*`` properties validation."""
|
||
length = get_length(token, percentage=True)
|
||
if length:
|
||
return length
|
||
if get_keyword(token) == 'auto':
|
||
return 'auto'
|
||
|
||
|
||
@validator('height')
|
||
@validator('width')
|
||
@single_token
|
||
def width_height(token):
|
||
"""Validation for the ``width`` and ``height`` properties."""
|
||
length = get_length(token, negative=False, percentage=True)
|
||
if length:
|
||
return length
|
||
if get_keyword(token) == 'auto':
|
||
return 'auto'
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def direction(keyword):
|
||
"""``direction`` property validation."""
|
||
return keyword in ('ltr', 'rtl')
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def display(keyword):
|
||
"""``display`` property validation."""
|
||
return keyword in (
|
||
'inline', 'block', 'inline-block', 'list-item', 'none',
|
||
'table', 'inline-table', 'table-caption',
|
||
'table-row-group', 'table-header-group', 'table-footer-group',
|
||
'table-row', 'table-column-group', 'table-column', 'table-cell')
|
||
|
||
|
||
@validator('float')
|
||
@single_keyword
|
||
def float_(keyword): # XXX do not hide the "float" builtin
|
||
"""``float`` property validation."""
|
||
return keyword in ('left', 'right', 'none')
|
||
|
||
|
||
@validator()
|
||
@comma_separated_list
|
||
def font_family(tokens):
|
||
"""``font-family`` property validation."""
|
||
if len(tokens) == 1 and tokens[0].type == 'STRING':
|
||
return tokens[0].value
|
||
elif tokens and all(token.type == 'IDENT' for token in tokens):
|
||
return ' '.join(token.value for token in tokens)
|
||
|
||
|
||
@validator()
|
||
@single_token
|
||
def font_size(token):
|
||
"""``font-size`` property validation."""
|
||
length = get_length(token, percentage=True)
|
||
if length:
|
||
return length
|
||
font_size_keyword = get_keyword(token)
|
||
if font_size_keyword in ('smaller', 'larger'):
|
||
raise InvalidValues('value not supported yet')
|
||
if (
|
||
font_size_keyword in computed_values.FONT_SIZE_KEYWORDS #or
|
||
#keyword in ('smaller', 'larger')
|
||
):
|
||
return font_size_keyword
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def font_style(keyword):
|
||
"""``font-style`` property validation."""
|
||
return keyword in ('normal', 'italic', 'oblique')
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def font_stretch(keyword):
|
||
"""Validation for the ``font-stretch`` property."""
|
||
return keyword in (
|
||
'ultra-condensed', 'extra-condensed', 'condensed', 'semi-condensed',
|
||
'normal',
|
||
'semi-expanded', 'expanded', 'extra-expanded', 'ultra-expanded')
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def font_variant(keyword):
|
||
"""``font-variant`` property validation."""
|
||
return keyword in ('normal', 'small-caps')
|
||
|
||
|
||
@validator()
|
||
@single_token
|
||
def font_weight(token):
|
||
"""``font-weight`` property validation."""
|
||
keyword = get_keyword(token)
|
||
if keyword in ('normal', 'bold', 'bolder', 'lighter'):
|
||
return keyword
|
||
if token.type == 'INTEGER':
|
||
if token.value in [100, 200, 300, 400, 500, 600, 700, 800, 900]:
|
||
return token.value
|
||
|
||
|
||
@validator('letter-spacing')
|
||
@validator('word-spacing')
|
||
@single_token
|
||
def spacing(token):
|
||
"""Validation for ``letter-spacing`` and ``word-spacing``."""
|
||
if get_keyword(token) == 'normal':
|
||
return 'normal'
|
||
length = get_length(token)
|
||
if length:
|
||
return length
|
||
|
||
|
||
@validator()
|
||
@single_token
|
||
def line_height(token):
|
||
"""``line-height`` property validation."""
|
||
if get_keyword(token) == 'normal':
|
||
return 'normal'
|
||
if (token.type in ('NUMBER', 'INTEGER', 'DIMENSION', 'PERCENTAGE') and
|
||
token.value >= 0):
|
||
return Dimension(token.value, token.unit)
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def list_style_position(keyword):
|
||
"""``list-style-position`` property validation."""
|
||
return keyword in ('inside', 'outside')
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def list_style_type(keyword):
|
||
"""``list-style-type`` property validation."""
|
||
return keyword in ('none', 'decimal') or keyword in counters.STYLES
|
||
|
||
|
||
@validator('padding-top')
|
||
@validator('padding-right')
|
||
@validator('padding-bottom')
|
||
@validator('padding-left')
|
||
@validator('min-width')
|
||
@validator('min-height')
|
||
@single_token
|
||
def length_or_precentage(token):
|
||
"""``padding-*`` properties validation."""
|
||
length = get_length(token, negative=False, percentage=True)
|
||
if length:
|
||
return length
|
||
|
||
|
||
@validator('max-width')
|
||
@validator('max-height')
|
||
@single_token
|
||
def max_width_height(token):
|
||
"""Validation for max-width and max-height"""
|
||
length = get_length(token, negative=False, percentage=True)
|
||
if length:
|
||
return length
|
||
if get_keyword(token) == 'none':
|
||
return Dimension(float('inf'), 'px')
|
||
|
||
|
||
@validator()
|
||
@single_token
|
||
def opacity(token):
|
||
"""Validation for the ``opacity`` property."""
|
||
if token.type in ('NUMBER', 'INTEGER'):
|
||
return min(1, max(0, token.value))
|
||
|
||
|
||
@validator()
|
||
@single_token
|
||
def z_index(token):
|
||
"""Validation for the ``z-index`` property."""
|
||
if get_keyword(token) == 'auto':
|
||
return 'auto'
|
||
if token.type == 'INTEGER':
|
||
return token.value
|
||
|
||
|
||
@validator('orphans')
|
||
@validator('widows')
|
||
@single_token
|
||
def orphans_widows(token):
|
||
"""Validation for the ``orphans`` or ``widows`` properties."""
|
||
if token.type == 'INTEGER':
|
||
value = token.value
|
||
if value >= 1:
|
||
return value
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def overflow(keyword):
|
||
"""Validation for the ``overflow`` property."""
|
||
return keyword in ('auto', 'visible', 'hidden', 'scroll')
|
||
|
||
|
||
@validator('page-break-before')
|
||
@validator('page-break-after')
|
||
@single_keyword
|
||
def page_break(keyword):
|
||
"""Validation for the ``page-break-before`` and ``page-break-after``
|
||
properties.
|
||
|
||
"""
|
||
return keyword in ('auto', 'always', 'left', 'right', 'avoid')
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def page_break_inside(keyword):
|
||
"""Validation for the ``page-break-inside`` property."""
|
||
return keyword in ('auto', 'avoid')
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def position(keyword):
|
||
"""``position`` property validation."""
|
||
return keyword in ('static', 'relative', 'absolute', 'fixed')
|
||
|
||
|
||
@validator()
|
||
def quotes(tokens):
|
||
"""``quotes`` property validation."""
|
||
if (tokens and len(tokens) % 2 == 0
|
||
and all(v.type == 'STRING' for v in tokens)):
|
||
strings = [v.value for v in tokens]
|
||
# Separate open and close quotes.
|
||
# eg. ['«', '»', '“', '”'] -> (['«', '“'], ['»', '”'])
|
||
return strings[::2], strings[1::2]
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def table_layout(keyword):
|
||
"""Validation for the ``table-layout`` property"""
|
||
if keyword in ('fixed', 'auto'):
|
||
return keyword
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def text_align(keyword):
|
||
"""``text-align`` property validation."""
|
||
return keyword in ('left', 'right', 'center', 'justify')
|
||
|
||
|
||
@validator()
|
||
def text_decoration(tokens):
|
||
"""``text-decoration`` property validation."""
|
||
keywords = [get_keyword(v) for v in tokens]
|
||
if keywords == ['none']:
|
||
return 'none'
|
||
if all(keyword in ('underline', 'overline', 'line-through', 'blink')
|
||
for keyword in keywords):
|
||
unique = set(keywords)
|
||
if len(unique) == len(keywords):
|
||
# No duplicate
|
||
# blink is accepted but ignored
|
||
# "Conforming user agents may simply not blink the text."
|
||
return frozenset(unique - set(['blink']))
|
||
|
||
|
||
@validator()
|
||
@single_token
|
||
def text_indent(token):
|
||
"""``text-indent`` property validation."""
|
||
length = get_length(token, percentage=True)
|
||
if length:
|
||
return length
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def text_transform(keyword):
|
||
"""``text-align`` property validation."""
|
||
return keyword in ('none', 'uppercase', 'lowercase', 'capitalize')
|
||
|
||
|
||
@validator()
|
||
@single_token
|
||
def vertical_align(token):
|
||
"""Validation for the ``vertical-align`` property"""
|
||
length = get_length(token, percentage=True)
|
||
if length:
|
||
return length
|
||
keyword = get_keyword(token)
|
||
if keyword in ('baseline', 'middle', 'sub', 'super',
|
||
'text-top', 'text-bottom', 'top', 'bottom'):
|
||
return keyword
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def visibility(keyword):
|
||
"""``white-space`` property validation."""
|
||
return keyword in ('visible', 'hidden', 'collapse')
|
||
|
||
|
||
@validator()
|
||
@single_keyword
|
||
def white_space(keyword):
|
||
"""``white-space`` property validation."""
|
||
return keyword in ('normal', 'pre', 'nowrap', 'pre-wrap', 'pre-line')
|
||
|
||
|
||
@validator(unprefixed=True)
|
||
@single_keyword
|
||
def image_rendering(keyword):
|
||
"""Validation for ``image-rendering``."""
|
||
return keyword in ('auto', 'optimizespeed', 'optimizequality')
|
||
|
||
|
||
@validator(unprefixed=True)
|
||
def size(tokens):
|
||
"""``size`` property validation.
|
||
|
||
See http://www.w3.org/TR/css3-page/#page-size-prop
|
||
|
||
"""
|
||
lengths = [get_length(token, negative=False) for token in tokens]
|
||
if all(lengths):
|
||
if len(lengths) == 1:
|
||
return (lengths[0], lengths[0])
|
||
elif len(lengths) == 2:
|
||
return tuple(lengths)
|
||
|
||
keywords = [get_keyword(v) for v in tokens]
|
||
if len(keywords) == 1:
|
||
keyword = keywords[0]
|
||
if keyword in computed_values.PAGE_SIZES:
|
||
return computed_values.PAGE_SIZES[keyword]
|
||
elif keyword in ('auto', 'portrait'):
|
||
return computed_values.INITIAL_PAGE_SIZE
|
||
elif keyword == 'landscape':
|
||
return computed_values.INITIAL_PAGE_SIZE[::-1]
|
||
|
||
if len(keywords) == 2:
|
||
if keywords[0] in ('portrait', 'landscape'):
|
||
orientation, page_size = keywords
|
||
elif keywords[1] in ('portrait', 'landscape'):
|
||
page_size, orientation = keywords
|
||
else:
|
||
page_size = None
|
||
if page_size in computed_values.PAGE_SIZES:
|
||
width_height = computed_values.PAGE_SIZES[page_size]
|
||
if orientation == 'portrait':
|
||
return width_height
|
||
else:
|
||
height, width = width_height
|
||
return width, height
|
||
|
||
|
||
@validator(prefixed=True) # Non-standard
|
||
@single_token
|
||
def anchor(token):
|
||
"""Validation for ``anchor``."""
|
||
if get_keyword(token) == 'none':
|
||
return 'none'
|
||
function = parse_function(token)
|
||
if function:
|
||
name, args = function
|
||
prototype = (name, [a.type for a in args])
|
||
args = [a.value for a in args]
|
||
if prototype == ('attr', ['IDENT']):
|
||
return (name, args[0])
|
||
|
||
|
||
@validator(prefixed=True, wants_base_url=True) # Non-standard
|
||
@single_token
|
||
def link(token, base_url):
|
||
"""Validation for ``link``."""
|
||
if get_keyword(token) == 'none':
|
||
return 'none'
|
||
elif token.type == 'URI':
|
||
if token.value.startswith('#'):
|
||
return 'internal', unquote(token.value[1:])
|
||
else:
|
||
return 'external', safe_urljoin(base_url, token.value)
|
||
function = parse_function(token)
|
||
if function:
|
||
name, args = function
|
||
prototype = (name, [a.type for a in args])
|
||
args = [a.value for a in args]
|
||
if prototype == ('attr', ['IDENT']):
|
||
return (name, args[0])
|
||
|
||
|
||
@validator(prefixed=True) # Non-standard
|
||
@single_token
|
||
def hyphens(token):
|
||
"""Validation for ``hyphens``."""
|
||
keyword = get_keyword(token)
|
||
if keyword in ('none', 'manual', 'auto'):
|
||
return keyword
|
||
elif token.type in ('NUMBER', 'INTEGER') and 0 <= token.value <= 1:
|
||
return token.value
|
||
|
||
|
||
@validator(prefixed=True) # Non-standard
|
||
@single_token
|
||
def lang(token):
|
||
"""Validation for ``lang``."""
|
||
if get_keyword(token) == 'none':
|
||
return 'none'
|
||
function = parse_function(token)
|
||
if function:
|
||
name, args = function
|
||
prototype = (name, [a.type for a in args])
|
||
args = [a.value for a in args]
|
||
if prototype == ('attr', ['IDENT']):
|
||
return (name, args[0])
|
||
elif token.type == 'STRING':
|
||
return ('string', token.value)
|
||
|
||
|
||
@validator(prefixed=True) # CSS3 GCPM, experimental
|
||
@single_token
|
||
def bookmark_label(token):
|
||
"""Validation for ``bookmark-label``."""
|
||
keyword = get_keyword(token)
|
||
if keyword in ('none', 'contents', 'content-before',
|
||
'content-element', 'content-after'):
|
||
return ('keyword', keyword)
|
||
elif token.type == 'STRING':
|
||
return ('string', token.value)
|
||
|
||
|
||
@validator(prefixed=True) # CSS3 GCPM, experimental
|
||
@single_token
|
||
def bookmark_level(token):
|
||
"""Validation for ``bookmark-level``."""
|
||
if token.type == 'INTEGER':
|
||
value = token.value
|
||
if value >= 1:
|
||
return value
|
||
elif get_keyword(token) == 'none':
|
||
return 'none'
|
||
|
||
|
||
@validator(unprefixed=True)
|
||
def transform(tokens):
|
||
if get_single_keyword(tokens) == 'none':
|
||
return []
|
||
else:
|
||
return [transform_function(v) for v in tokens]
|
||
|
||
|
||
def transform_function(token):
|
||
function = parse_function(token)
|
||
if not function:
|
||
raise InvalidValues
|
||
name, args = function
|
||
|
||
if len(args) == 1:
|
||
angle = get_angle(args[0])
|
||
length = get_length(args[0], percentage=True)
|
||
if name in ('rotate', 'skewx', 'skewy') and angle:
|
||
return name, angle
|
||
elif name in ('translatex', 'translate') and length:
|
||
return 'translate', (length, computed_values.ZERO_PIXELS)
|
||
elif name == 'translatey' and length:
|
||
return 'translate', (computed_values.ZERO_PIXELS, length)
|
||
elif name == 'scalex' and args[0].type in ('NUMBER', 'INTEGER'):
|
||
return 'scale', (args[0].value, 1)
|
||
elif name == 'scaley' and args[0].type in ('NUMBER', 'INTEGER'):
|
||
return 'scale', (1, args[0].value)
|
||
elif name == 'scale' and args[0].type in ('NUMBER', 'INTEGER'):
|
||
return 'scale', (args[0].value,) * 2
|
||
elif len(args) == 2:
|
||
if name == 'scale' and all(a.type in ('NUMBER', 'INTEGER')
|
||
for a in args):
|
||
return name, [arg.value for arg in args]
|
||
lengths = tuple(get_length(token, percentage=True) for token in args)
|
||
if name == 'translate' and all(lengths):
|
||
return name, lengths
|
||
elif len(args) == 6 and name == 'matrix' and all(
|
||
a.type in ('NUMBER', 'INTEGER') for a in args):
|
||
return name, [arg.value for arg in args]
|
||
raise InvalidValues
|
||
|
||
|
||
# Expanders
|
||
|
||
# Let's be consistent, always use ``name`` as an argument even
|
||
# when it is useless.
|
||
# pylint: disable=W0613
|
||
|
||
def expander(property_name):
|
||
"""Decorator adding a function to the ``EXPANDERS``."""
|
||
def expander_decorator(function):
|
||
"""Add ``function`` to the ``EXPANDERS``."""
|
||
assert property_name not in EXPANDERS, property_name
|
||
EXPANDERS[property_name] = function
|
||
return function
|
||
return expander_decorator
|
||
|
||
|
||
@expander('border-color')
|
||
@expander('border-style')
|
||
@expander('border-width')
|
||
@expander('margin')
|
||
@expander('padding')
|
||
def expand_four_sides(base_url, name, tokens):
|
||
"""Expand properties setting a token for the four sides of a box."""
|
||
# Make sure we have 4 tokens
|
||
if len(tokens) == 1:
|
||
tokens *= 4
|
||
elif len(tokens) == 2:
|
||
tokens *= 2 # (bottom, left) defaults to (top, right)
|
||
elif len(tokens) == 3:
|
||
tokens.append(tokens[1]) # left defaults to right
|
||
elif len(tokens) != 4:
|
||
raise InvalidValues(
|
||
'Expected 1 to 4 token components got %i' % len(tokens))
|
||
for suffix, token in zip(('-top', '-right', '-bottom', '-left'), tokens):
|
||
i = name.rfind('-')
|
||
if i == -1:
|
||
new_name = name + suffix
|
||
else:
|
||
# eg. border-color becomes border-*-color, not border-color-*
|
||
new_name = name[:i] + suffix + name[i:]
|
||
|
||
# validate_non_shorthand returns [(name, value)], we want
|
||
# to yield (name, value)
|
||
result, = validate_non_shorthand(
|
||
base_url, new_name, [token], required=True)
|
||
yield result
|
||
|
||
|
||
def generic_expander(*expanded_names, **kwargs):
|
||
"""Decorator helping expanders to handle ``inherit`` and ``initial``.
|
||
|
||
Wrap an expander so that it does not have to handle the 'inherit' and
|
||
'initial' cases, and can just yield name suffixes. Missing suffixes
|
||
get the initial value.
|
||
|
||
"""
|
||
wants_base_url = kwargs.pop('wants_base_url', False)
|
||
assert not kwargs
|
||
def generic_expander_decorator(wrapped):
|
||
"""Decorate the ``wrapped`` expander."""
|
||
@functools.wraps(wrapped)
|
||
def generic_expander_wrapper(base_url, name, tokens):
|
||
"""Wrap the expander."""
|
||
keyword = get_single_keyword(tokens)
|
||
if keyword in ('inherit', 'initial'):
|
||
results = dict.fromkeys(expanded_names, keyword)
|
||
skip_validation = True
|
||
else:
|
||
skip_validation = False
|
||
results = {}
|
||
if wants_base_url:
|
||
result = wrapped(name, tokens, base_url)
|
||
else:
|
||
result = wrapped(name, tokens)
|
||
for new_name, new_token in result:
|
||
assert new_name in expanded_names, new_name
|
||
if new_name in results:
|
||
raise InvalidValues(
|
||
'got multiple %s values in a %s shorthand'
|
||
% (new_name.strip('-'), name))
|
||
results[new_name] = new_token
|
||
|
||
for new_name in expanded_names:
|
||
if new_name.startswith('-'):
|
||
# new_name is a suffix
|
||
actual_new_name = name + new_name
|
||
else:
|
||
actual_new_name = new_name
|
||
|
||
if new_name in results:
|
||
value = results[new_name]
|
||
if not skip_validation:
|
||
# validate_non_shorthand returns [(name, value)]
|
||
(actual_new_name, value), = validate_non_shorthand(
|
||
base_url, actual_new_name, value, required=True)
|
||
else:
|
||
value = 'initial'
|
||
|
||
yield actual_new_name, value
|
||
return generic_expander_wrapper
|
||
return generic_expander_decorator
|
||
|
||
|
||
@expander('list-style')
|
||
@generic_expander('-type', '-position', '-image', wants_base_url=True)
|
||
def expand_list_style(name, tokens, base_url):
|
||
"""Expand the ``list-style`` shorthand property.
|
||
|
||
See http://www.w3.org/TR/CSS21/generate.html#propdef-list-style
|
||
|
||
"""
|
||
type_specified = image_specified = False
|
||
none_count = 0
|
||
for token in tokens:
|
||
if get_keyword(token) == 'none':
|
||
# Can be either -style or -image, see at the end which is not
|
||
# otherwise specified.
|
||
none_count += 1
|
||
none_token = token
|
||
continue
|
||
|
||
if list_style_type([token]) is not None:
|
||
suffix = '-type'
|
||
type_specified = True
|
||
elif list_style_position([token]) is not None:
|
||
suffix = '-position'
|
||
elif image([token], base_url) is not None:
|
||
suffix = '-image'
|
||
image_specified = True
|
||
else:
|
||
raise InvalidValues
|
||
yield suffix, [token]
|
||
|
||
if not type_specified and none_count:
|
||
yield '-type', [none_token]
|
||
none_count -= 1
|
||
|
||
if not image_specified and none_count:
|
||
yield '-image', [none_token]
|
||
none_count -= 1
|
||
|
||
if none_count:
|
||
# Too many none tokens.
|
||
raise InvalidValues
|
||
|
||
|
||
@expander('border')
|
||
def expand_border(base_url, name, tokens):
|
||
"""Expand the ``border`` shorthand property.
|
||
|
||
See http://www.w3.org/TR/CSS21/box.html#propdef-border
|
||
|
||
"""
|
||
for suffix in ('-top', '-right', '-bottom', '-left'):
|
||
for new_prop in expand_border_side(base_url, name + suffix, tokens):
|
||
yield new_prop
|
||
|
||
|
||
@expander('border-top')
|
||
@expander('border-right')
|
||
@expander('border-bottom')
|
||
@expander('border-left')
|
||
@expander('outline')
|
||
@generic_expander('-width', '-color', '-style')
|
||
def expand_border_side(name, tokens):
|
||
"""Expand the ``border-*`` shorthand properties.
|
||
|
||
See http://www.w3.org/TR/CSS21/box.html#propdef-border-top
|
||
|
||
"""
|
||
for token in tokens:
|
||
if parse_color(token) is not None:
|
||
suffix = '-color'
|
||
elif border_width([token]) is not None:
|
||
suffix = '-width'
|
||
elif border_style([token]) is not None:
|
||
suffix = '-style'
|
||
else:
|
||
raise InvalidValues
|
||
yield suffix, [token]
|
||
|
||
|
||
@expander('background')
|
||
def expand_background(base_url, name, tokens):
|
||
"""Expand the ``background`` shorthand property.
|
||
|
||
See http://dev.w3.org/csswg/css3-background/#the-background
|
||
|
||
"""
|
||
properties = [
|
||
'background_color', 'background_image', 'background_repeat',
|
||
'background_attachment', 'background_position', 'background_size',
|
||
'background_clip', 'background_origin']
|
||
keyword = get_single_keyword(tokens)
|
||
if keyword in ('initial', 'inherit'):
|
||
for name in properties:
|
||
yield name, keyword
|
||
return
|
||
|
||
def parse_layer(tokens, can_have_color=False):
|
||
results = {}
|
||
def add(name, value):
|
||
if value is None:
|
||
return False
|
||
name = 'background_' + name
|
||
if name in results:
|
||
raise InvalidValues
|
||
results[name] = value
|
||
return True
|
||
|
||
# Make `tokens` a stack
|
||
tokens = list(reversed(tokens))
|
||
while tokens:
|
||
token = tokens.pop()
|
||
if can_have_color and add('color', parse_color(token)):
|
||
continue
|
||
if add('image', image.single_value([token], base_url)):
|
||
continue
|
||
if add('repeat', background_repeat.single_value([token])):
|
||
continue
|
||
if add('attachment', background_attachment.single_value([token])):
|
||
continue
|
||
position = background_position.single_value([token])
|
||
if position is not None:
|
||
if tokens:
|
||
next_token = tokens.pop()
|
||
if add('position', background_position.single_value(
|
||
[token, next_token])):
|
||
continue # A two-token position.
|
||
# Put the unused token back for the next loop iteration
|
||
tokens.append(next_token)
|
||
assert add('position', position)
|
||
continue
|
||
raise InvalidValues
|
||
|
||
color = results.pop(
|
||
'background_color', INITIAL_VALUES['background_color'])
|
||
for name in properties:
|
||
if name not in results:
|
||
results[name] = INITIAL_VALUES[name][0]
|
||
return color, results
|
||
|
||
layers = reversed(split_on_comma(tokens))
|
||
color, last_layer = parse_layer(next(layers), can_have_color=True)
|
||
results = dict((k, [v]) for k, v in last_layer.items())
|
||
for tokens in layers:
|
||
_, layer = parse_layer(tokens)
|
||
for name, value in layer.items():
|
||
results[name].append(value)
|
||
for name, values in results.items():
|
||
yield name, values[::-1] # "Un-reverse"
|
||
yield 'background-color', color
|
||
|
||
|
||
@expander('font')
|
||
@generic_expander('-style', '-variant', '-weight', '-size',
|
||
'line-height', '-family') # line-height is not a suffix
|
||
def expand_font(name, tokens):
|
||
"""Expand the ``font`` shorthand property.
|
||
|
||
http://www.w3.org/TR/CSS21/fonts.html#font-shorthand
|
||
"""
|
||
expand_font_keyword = get_single_keyword(tokens)
|
||
if expand_font_keyword in ('caption', 'icon', 'menu', 'message-box',
|
||
'small-caption', 'status-bar'):
|
||
raise InvalidValues('System fonts are not supported')
|
||
|
||
# Make `tokens` a stack
|
||
tokens = list(reversed(tokens))
|
||
# Values for font-style font-variant and font-weight can come in any
|
||
# order and are all optional.
|
||
while tokens:
|
||
token = tokens.pop()
|
||
if get_keyword(token) == 'normal':
|
||
# Just ignore 'normal' keywords. Unspecified properties will get
|
||
# their initial token, which is 'normal' for all three here.
|
||
# TODO: fail if there is too many 'normal' values?
|
||
continue
|
||
|
||
if font_style([token]) is not None:
|
||
suffix = '-style'
|
||
elif font_variant([token]) is not None:
|
||
suffix = '-variant'
|
||
elif font_weight([token]) is not None:
|
||
suffix = '-weight'
|
||
else:
|
||
# We’re done with these three, continue with font-size
|
||
break
|
||
yield suffix, [token]
|
||
|
||
# Then font-size is mandatory
|
||
# Latest `token` from the loop.
|
||
if font_size([token]) is None:
|
||
raise InvalidValues
|
||
yield '-size', [token]
|
||
|
||
# Then line-height is optional, but font-family is not so the list
|
||
# must not be empty yet
|
||
if not tokens:
|
||
raise InvalidValues
|
||
|
||
token = tokens.pop()
|
||
if token.type == 'DELIM' and token.value == '/':
|
||
token = tokens.pop()
|
||
if line_height([token]) is None:
|
||
raise InvalidValues
|
||
yield 'line-height', [token]
|
||
else:
|
||
# We pop()ed a font-family, add it back
|
||
tokens.append(token)
|
||
|
||
# Reverse the stack to get normal list
|
||
tokens.reverse()
|
||
if font_family(tokens) is None:
|
||
raise InvalidValues
|
||
yield '-family', tokens
|
||
|
||
|
||
def validate_non_shorthand(base_url, name, tokens, required=False):
|
||
"""Default validator for non-shorthand properties."""
|
||
if not required and name not in KNOWN_PROPERTIES:
|
||
hyphens_name = name.replace('_', '-')
|
||
if hyphens_name in KNOWN_PROPERTIES:
|
||
raise InvalidValues('did you mean %s?' % hyphens_name)
|
||
else:
|
||
raise InvalidValues('unknown property')
|
||
|
||
if not required and name not in VALIDATORS:
|
||
raise InvalidValues('property not supported yet')
|
||
|
||
keyword = get_single_keyword(tokens)
|
||
if keyword in ('initial', 'inherit'):
|
||
value = keyword
|
||
else:
|
||
function = VALIDATORS[name]
|
||
if function.wants_base_url:
|
||
value = function(tokens, base_url)
|
||
else:
|
||
value = function(tokens)
|
||
if value is None:
|
||
raise InvalidValues
|
||
return [(name, value)]
|
||
|
||
|
||
def preprocess_declarations(base_url, declarations):
|
||
"""
|
||
Expand shorthand properties and filter unsupported properties and values.
|
||
|
||
Log a warning for every ignored declaration.
|
||
|
||
Return a iterable of ``(name, value, priority)`` tuples.
|
||
|
||
"""
|
||
def validation_error(level, reason):
|
||
getattr(LOGGER, level)('Ignored `%s: %s` at %i:%i, %s.',
|
||
declaration.name, declaration.value.as_css(),
|
||
declaration.line, declaration.column, reason)
|
||
|
||
for declaration in declarations:
|
||
name = declaration.name
|
||
|
||
if name in PREFIXED and not name.startswith(PREFIX):
|
||
validation_error('warn',
|
||
'the property is experimental or non-standard, use '
|
||
+ PREFIX + name)
|
||
continue
|
||
|
||
if name in NOT_PRINT_MEDIA:
|
||
validation_error('info',
|
||
'the property does not apply for the print media')
|
||
continue
|
||
|
||
if name.startswith(PREFIX):
|
||
unprefixed_name = name[len(PREFIX):]
|
||
if unprefixed_name in UNPREFIXED:
|
||
validation_error('warn',
|
||
'the property was unprefixed, use ' + unprefixed_name)
|
||
continue
|
||
if unprefixed_name in PREFIXED:
|
||
name = unprefixed_name
|
||
|
||
expander_ = EXPANDERS.get(name, validate_non_shorthand)
|
||
tokens = remove_whitespace(declaration.value)
|
||
try:
|
||
# Use list() to consume generators now and catch any error.
|
||
result = list(expander_(base_url, name, tokens))
|
||
except InvalidValues as exc:
|
||
validation_error('warn',
|
||
exc.args[0] if exc.args and exc.args[0] else 'invalid value')
|
||
continue
|
||
|
||
priority = declaration.priority
|
||
for long_name, value in result:
|
||
yield long_name.replace('-', '_'), value, priority
|