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280 lines
9.8 KiB
Python
280 lines
9.8 KiB
Python
"""Integration code for CSS selectors using Soup Sieve (pypi: soupsieve)."""
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import warnings
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try:
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import soupsieve
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except ImportError as e:
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soupsieve = None
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warnings.warn(
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'The soupsieve package is not installed. CSS selectors cannot be used.'
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)
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class CSS(object):
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"""A proxy object against the soupsieve library, to simplify its
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CSS selector API.
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Acquire this object through the .css attribute on the
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BeautifulSoup object, or on the Tag you want to use as the
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starting point for a CSS selector.
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The main advantage of doing this is that the tag to be selected
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against doesn't need to be explicitly specified in the function
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calls, since it's already scoped to a tag.
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"""
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def __init__(self, tag, api=soupsieve):
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"""Constructor.
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You don't need to instantiate this class yourself; instead,
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access the .css attribute on the BeautifulSoup object, or on
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the Tag you want to use as the starting point for your CSS
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selector.
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:param tag: All CSS selectors will use this as their starting
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point.
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:param api: A plug-in replacement for the soupsieve module,
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designed mainly for use in tests.
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"""
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if api is None:
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raise NotImplementedError(
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"Cannot execute CSS selectors because the soupsieve package is not installed."
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)
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self.api = api
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self.tag = tag
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def escape(self, ident):
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"""Escape a CSS identifier.
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This is a simple wrapper around soupselect.escape(). See the
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documentation for that function for more information.
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"""
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if soupsieve is None:
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raise NotImplementedError(
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"Cannot escape CSS identifiers because the soupsieve package is not installed."
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)
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return self.api.escape(ident)
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def _ns(self, ns, select):
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"""Normalize a dictionary of namespaces."""
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if not isinstance(select, self.api.SoupSieve) and ns is None:
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# If the selector is a precompiled pattern, it already has
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# a namespace context compiled in, which cannot be
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# replaced.
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ns = self.tag._namespaces
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return ns
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def _rs(self, results):
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"""Normalize a list of results to a Resultset.
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A ResultSet is more consistent with the rest of Beautiful
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Soup's API, and ResultSet.__getattr__ has a helpful error
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message if you try to treat a list of results as a single
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result (a common mistake).
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"""
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# Import here to avoid circular import
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from .element import ResultSet
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return ResultSet(None, results)
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def compile(self, select, namespaces=None, flags=0, **kwargs):
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"""Pre-compile a selector and return the compiled object.
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:param selector: A CSS selector.
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:param namespaces: A dictionary mapping namespace prefixes
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used in the CSS selector to namespace URIs. By default,
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Beautiful Soup will use the prefixes it encountered while
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parsing the document.
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:param flags: Flags to be passed into Soup Sieve's
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soupsieve.compile() method.
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:param kwargs: Keyword arguments to be passed into SoupSieve's
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soupsieve.compile() method.
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:return: A precompiled selector object.
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:rtype: soupsieve.SoupSieve
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"""
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return self.api.compile(
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select, self._ns(namespaces, select), flags, **kwargs
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)
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def select_one(self, select, namespaces=None, flags=0, **kwargs):
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"""Perform a CSS selection operation on the current Tag and return the
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first result.
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This uses the Soup Sieve library. For more information, see
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that library's documentation for the soupsieve.select_one()
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method.
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:param selector: A CSS selector.
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:param namespaces: A dictionary mapping namespace prefixes
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used in the CSS selector to namespace URIs. By default,
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Beautiful Soup will use the prefixes it encountered while
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parsing the document.
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:param flags: Flags to be passed into Soup Sieve's
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soupsieve.select_one() method.
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:param kwargs: Keyword arguments to be passed into SoupSieve's
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soupsieve.select_one() method.
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:return: A Tag, or None if the selector has no match.
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:rtype: bs4.element.Tag
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"""
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return self.api.select_one(
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select, self.tag, self._ns(namespaces, select), flags, **kwargs
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)
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def select(self, select, namespaces=None, limit=0, flags=0, **kwargs):
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"""Perform a CSS selection operation on the current Tag.
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This uses the Soup Sieve library. For more information, see
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that library's documentation for the soupsieve.select()
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method.
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:param selector: A string containing a CSS selector.
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:param namespaces: A dictionary mapping namespace prefixes
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used in the CSS selector to namespace URIs. By default,
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Beautiful Soup will pass in the prefixes it encountered while
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parsing the document.
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:param limit: After finding this number of results, stop looking.
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:param flags: Flags to be passed into Soup Sieve's
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soupsieve.select() method.
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:param kwargs: Keyword arguments to be passed into SoupSieve's
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soupsieve.select() method.
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:return: A ResultSet of Tag objects.
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:rtype: bs4.element.ResultSet
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"""
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if limit is None:
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limit = 0
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return self._rs(
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self.api.select(
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select, self.tag, self._ns(namespaces, select), limit, flags,
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**kwargs
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)
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)
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def iselect(self, select, namespaces=None, limit=0, flags=0, **kwargs):
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"""Perform a CSS selection operation on the current Tag.
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This uses the Soup Sieve library. For more information, see
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that library's documentation for the soupsieve.iselect()
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method. It is the same as select(), but it returns a generator
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instead of a list.
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:param selector: A string containing a CSS selector.
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:param namespaces: A dictionary mapping namespace prefixes
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used in the CSS selector to namespace URIs. By default,
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Beautiful Soup will pass in the prefixes it encountered while
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parsing the document.
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:param limit: After finding this number of results, stop looking.
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:param flags: Flags to be passed into Soup Sieve's
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soupsieve.iselect() method.
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:param kwargs: Keyword arguments to be passed into SoupSieve's
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soupsieve.iselect() method.
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:return: A generator
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:rtype: types.GeneratorType
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"""
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return self.api.iselect(
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select, self.tag, self._ns(namespaces, select), limit, flags, **kwargs
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)
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def closest(self, select, namespaces=None, flags=0, **kwargs):
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"""Find the Tag closest to this one that matches the given selector.
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This uses the Soup Sieve library. For more information, see
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that library's documentation for the soupsieve.closest()
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method.
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:param selector: A string containing a CSS selector.
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:param namespaces: A dictionary mapping namespace prefixes
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used in the CSS selector to namespace URIs. By default,
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Beautiful Soup will pass in the prefixes it encountered while
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parsing the document.
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:param flags: Flags to be passed into Soup Sieve's
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soupsieve.closest() method.
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:param kwargs: Keyword arguments to be passed into SoupSieve's
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soupsieve.closest() method.
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:return: A Tag, or None if there is no match.
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:rtype: bs4.Tag
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"""
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return self.api.closest(
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select, self.tag, self._ns(namespaces, select), flags, **kwargs
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)
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def match(self, select, namespaces=None, flags=0, **kwargs):
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"""Check whether this Tag matches the given CSS selector.
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This uses the Soup Sieve library. For more information, see
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that library's documentation for the soupsieve.match()
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method.
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:param: a CSS selector.
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:param namespaces: A dictionary mapping namespace prefixes
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used in the CSS selector to namespace URIs. By default,
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Beautiful Soup will pass in the prefixes it encountered while
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parsing the document.
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:param flags: Flags to be passed into Soup Sieve's
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soupsieve.match() method.
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:param kwargs: Keyword arguments to be passed into SoupSieve's
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soupsieve.match() method.
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:return: True if this Tag matches the selector; False otherwise.
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:rtype: bool
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"""
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return self.api.match(
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select, self.tag, self._ns(namespaces, select), flags, **kwargs
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)
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def filter(self, select, namespaces=None, flags=0, **kwargs):
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"""Filter this Tag's direct children based on the given CSS selector.
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This uses the Soup Sieve library. It works the same way as
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passing this Tag into that library's soupsieve.filter()
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method. More information, for more information see the
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documentation for soupsieve.filter().
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:param namespaces: A dictionary mapping namespace prefixes
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used in the CSS selector to namespace URIs. By default,
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Beautiful Soup will pass in the prefixes it encountered while
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parsing the document.
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:param flags: Flags to be passed into Soup Sieve's
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soupsieve.filter() method.
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:param kwargs: Keyword arguments to be passed into SoupSieve's
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soupsieve.filter() method.
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:return: A ResultSet of Tag objects.
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:rtype: bs4.element.ResultSet
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"""
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return self._rs(
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self.api.filter(
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select, self.tag, self._ns(namespaces, select), flags, **kwargs
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)
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)
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