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@ -1,5 +1,4 @@ |
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# Use of this source code is governed by a BSD-style license that can be |
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# found in the LICENSE file. |
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# Use of this source code is governed by the MIT license. |
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__license__ = "MIT" |
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try: |
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@ -7,14 +6,25 @@ try: |
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except ImportError , e: |
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from collections import Callable |
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import re |
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import shlex |
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import sys |
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import warnings |
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try: |
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import soupsieve |
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except ImportError, 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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from bs4.dammit import EntitySubstitution |
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DEFAULT_OUTPUT_ENCODING = "utf-8" |
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PY3K = (sys.version_info[0] > 2) |
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nonwhitespace_re = re.compile(r"\S+") |
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# NOTE: This isn't used as of 4.7.0. I'm leaving it for a little bit on |
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# the off chance someone imported it for their own use. |
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whitespace_re = re.compile(r"\s+") |
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def _alias(attr): |
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@ -207,7 +217,7 @@ class PageElement(object): |
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if formatter is None: |
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output = s |
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else: |
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if callable(formatter): |
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if isinstance(formatter, Callable): |
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# Backwards compatibility -- you used to pass in a formatting method. |
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output = formatter(s) |
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else: |
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@ -256,26 +266,26 @@ class PageElement(object): |
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self.previous_element.next_element = self |
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self.next_element = next_element |
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if self.next_element: |
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if self.next_element is not None: |
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self.next_element.previous_element = self |
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self.next_sibling = next_sibling |
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if self.next_sibling: |
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if self.next_sibling is not None: |
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self.next_sibling.previous_sibling = self |
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if (not previous_sibling |
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if (previous_sibling is None |
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and self.parent is not None and self.parent.contents): |
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previous_sibling = self.parent.contents[-1] |
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self.previous_sibling = previous_sibling |
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if previous_sibling: |
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if previous_sibling is not None: |
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self.previous_sibling.next_sibling = self |
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nextSibling = _alias("next_sibling") # BS3 |
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previousSibling = _alias("previous_sibling") # BS3 |
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def replace_with(self, replace_with): |
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if not self.parent: |
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if self.parent is None: |
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raise ValueError( |
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"Cannot replace one element with another when the" |
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"element to be replaced is not part of a tree.") |
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@ -292,7 +302,7 @@ class PageElement(object): |
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def unwrap(self): |
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my_parent = self.parent |
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if not self.parent: |
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if self.parent is None: |
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raise ValueError( |
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"Cannot replace an element with its contents when that" |
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"element is not part of a tree.") |
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@ -340,7 +350,7 @@ class PageElement(object): |
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def _last_descendant(self, is_initialized=True, accept_self=True): |
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"Finds the last element beneath this object to be parsed." |
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if is_initialized and self.next_sibling: |
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if is_initialized and self.next_sibling is not None: |
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last_child = self.next_sibling.previous_element |
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else: |
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last_child = self |
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@ -430,18 +440,24 @@ class PageElement(object): |
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"""Appends the given tag to the contents of this tag.""" |
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self.insert(len(self.contents), tag) |
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def insert_before(self, predecessor): |
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"""Makes the given element the immediate predecessor of this one. |
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def extend(self, tags): |
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"""Appends the given tags to the contents of this tag.""" |
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for tag in tags: |
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self.append(tag) |
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The two elements will have the same parent, and the given element |
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def insert_before(self, *args): |
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"""Makes the given element(s) the immediate predecessor of this one. |
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The elements will have the same parent, and the given elements |
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will be immediately before this one. |
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""" |
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if self is predecessor: |
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raise ValueError("Can't insert an element before itself.") |
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parent = self.parent |
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if parent is None: |
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raise ValueError( |
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"Element has no parent, so 'before' has no meaning.") |
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if any(x is self for x in args): |
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raise ValueError("Can't insert an element before itself.") |
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for predecessor in args: |
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# Extract first so that the index won't be screwed up if they |
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# are siblings. |
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if isinstance(predecessor, PageElement): |
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@ -449,24 +465,29 @@ class PageElement(object): |
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index = parent.index(self) |
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parent.insert(index, predecessor) |
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def insert_after(self, successor): |
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"""Makes the given element the immediate successor of this one. |
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def insert_after(self, *args): |
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"""Makes the given element(s) the immediate successor of this one. |
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The two elements will have the same parent, and the given element |
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The elements will have the same parent, and the given elements |
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will be immediately after this one. |
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""" |
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if self is successor: |
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raise ValueError("Can't insert an element after itself.") |
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# Do all error checking before modifying the tree. |
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parent = self.parent |
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if parent is None: |
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raise ValueError( |
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"Element has no parent, so 'after' has no meaning.") |
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if any(x is self for x in args): |
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raise ValueError("Can't insert an element after itself.") |
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offset = 0 |
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for successor in args: |
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# Extract first so that the index won't be screwed up if they |
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# are siblings. |
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if isinstance(successor, PageElement): |
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successor.extract() |
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index = parent.index(self) |
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parent.insert(index+1, successor) |
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parent.insert(index+1+offset, successor) |
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offset += 1 |
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def find_next(self, name=None, attrs={}, text=None, **kwargs): |
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"""Returns the first item that matches the given criteria and |
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@ -657,82 +678,6 @@ class PageElement(object): |
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yield i |
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i = i.parent |
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# Methods for supporting CSS selectors. |
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tag_name_re = re.compile('^[a-zA-Z0-9][-.a-zA-Z0-9:_]*$') |
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# /^([a-zA-Z0-9][-.a-zA-Z0-9:_]*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/ |
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# \---------------------------/ \---/\-------------/ \-------/ |
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# | | | | |
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# | | | The value |
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# | | ~,|,^,$,* or = |
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# | Attribute |
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# Tag |
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attribselect_re = re.compile( |
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r'^(?P<tag>[a-zA-Z0-9][-.a-zA-Z0-9:_]*)?\[(?P<attribute>[\w-]+)(?P<operator>[=~\|\^\$\*]?)' + |
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r'=?"?(?P<value>[^\]"]*)"?\]$' |
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) |
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def _attr_value_as_string(self, value, default=None): |
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"""Force an attribute value into a string representation. |
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A multi-valued attribute will be converted into a |
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space-separated stirng. |
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""" |
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value = self.get(value, default) |
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if isinstance(value, list) or isinstance(value, tuple): |
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value =" ".join(value) |
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return value |
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def _tag_name_matches_and(self, function, tag_name): |
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if not tag_name: |
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return function |
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else: |
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def _match(tag): |
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return tag.name == tag_name and function(tag) |
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return _match |
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def _attribute_checker(self, operator, attribute, value=''): |
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"""Create a function that performs a CSS selector operation. |
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Takes an operator, attribute and optional value. Returns a |
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function that will return True for elements that match that |
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combination. |
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""" |
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if operator == '=': |
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# string representation of `attribute` is equal to `value` |
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return lambda el: el._attr_value_as_string(attribute) == value |
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elif operator == '~': |
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# space-separated list representation of `attribute` |
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# contains `value` |
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def _includes_value(element): |
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attribute_value = element.get(attribute, []) |
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if not isinstance(attribute_value, list): |
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attribute_value = attribute_value.split() |
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return value in attribute_value |
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return _includes_value |
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elif operator == '^': |
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# string representation of `attribute` starts with `value` |
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return lambda el: el._attr_value_as_string( |
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attribute, '').startswith(value) |
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elif operator == '$': |
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# string representation of `attribute` ends with `value` |
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return lambda el: el._attr_value_as_string( |
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attribute, '').endswith(value) |
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elif operator == '*': |
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# string representation of `attribute` contains `value` |
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return lambda el: value in el._attr_value_as_string(attribute, '') |
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elif operator == '|': |
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# string representation of `attribute` is either exactly |
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# `value` or starts with `value` and then a dash. |
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def _is_or_starts_with_dash(element): |
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attribute_value = element._attr_value_as_string(attribute, '') |
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return (attribute_value == value or attribute_value.startswith( |
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value + '-')) |
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return _is_or_starts_with_dash |
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else: |
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return lambda el: el.has_attr(attribute) |
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# Old non-property versions of the generators, for backwards |
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# compatibility with BS3. |
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def nextGenerator(self): |
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@ -1193,7 +1138,7 @@ class Tag(PageElement): |
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# First off, turn a string formatter into a Formatter object. This |
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# will stop the lookup from happening over and over again. |
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if not isinstance(formatter, Formatter) and not callable(formatter): |
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if not isinstance(formatter, Formatter) and not isinstance(formatter, Callable): |
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formatter = self._formatter_for_name(formatter) |
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attrs = [] |
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if self.attrs: |
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@ -1298,7 +1243,7 @@ class Tag(PageElement): |
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""" |
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# First off, turn a string formatter into a Formatter object. This |
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# will stop the lookup from happening over and over again. |
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if not isinstance(formatter, Formatter) and not callable(formatter): |
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if not isinstance(formatter, Formatter) and not isinstance(formatter, Callable): |
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formatter = self._formatter_for_name(formatter) |
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pretty_print = (indent_level is not None) |
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@ -1394,250 +1339,41 @@ class Tag(PageElement): |
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current = current.next_element |
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# CSS selector code |
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_selector_combinators = ['>', '+', '~'] |
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_select_debug = False |
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quoted_colon = re.compile('"[^"]*:[^"]*"') |
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def select_one(self, selector): |
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def select_one(self, selector, namespaces=None, **kwargs): |
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"""Perform a CSS selection operation on the current element.""" |
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value = self.select(selector, limit=1) |
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value = self.select(selector, namespaces, 1, **kwargs) |
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if value: |
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return value[0] |
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return None |
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def select(self, selector, _candidate_generator=None, limit=None): |
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"""Perform a CSS selection operation on the current element.""" |
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def select(self, selector, namespaces=None, limit=None, **kwargs): |
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"""Perform a CSS selection operation on the current element. |
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# Handle grouping selectors if ',' exists, ie: p,a |
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if ',' in selector: |
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context = [] |
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selectors = [x.strip() for x in selector.split(",")] |
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# If a selector is mentioned multiple times we don't want |
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# to use it more than once. |
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used_selectors = set() |
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# We also don't want to select the same element more than once, |
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# if it's matched by multiple selectors. |
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selected_object_ids = set() |
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for partial_selector in selectors: |
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if partial_selector == '': |
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raise ValueError('Invalid group selection syntax: %s' % selector) |
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if partial_selector in used_selectors: |
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continue |
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used_selectors.add(partial_selector) |
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candidates = self.select(partial_selector, limit=limit) |
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for candidate in candidates: |
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# This lets us distinguish between distinct tags that |
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# represent the same markup. |
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object_id = id(candidate) |
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if object_id not in selected_object_ids: |
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context.append(candidate) |
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selected_object_ids.add(object_id) |
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if limit and len(context) >= limit: |
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break |
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return context |
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tokens = shlex.split(selector) |
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current_context = [self] |
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This uses the SoupSieve library. |
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if tokens[-1] in self._selector_combinators: |
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raise ValueError( |
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'Final combinator "%s" is missing an argument.' % tokens[-1]) |
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:param selector: A string containing a CSS selector. |
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if self._select_debug: |
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print 'Running CSS selector "%s"' % 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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for index, token in enumerate(tokens): |
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new_context = [] |
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new_context_ids = set([]) |
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:param limit: After finding this number of results, stop looking. |
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if tokens[index-1] in self._selector_combinators: |
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# This token was consumed by the previous combinator. Skip it. |
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if self._select_debug: |
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print ' Token was consumed by the previous combinator.' |
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continue |
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:param kwargs: Any extra arguments you'd like to pass in to |
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soupsieve.select(). |
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""" |
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if namespaces is None: |
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namespaces = self._namespaces |
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if self._select_debug: |
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print ' Considering token "%s"' % token |
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recursive_candidate_generator = None |
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tag_name = None |
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# Each operation corresponds to a checker function, a rule |
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# for determining whether a candidate matches the |
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# selector. Candidates are generated by the active |
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# iterator. |
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checker = None |
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m = self.attribselect_re.match(token) |
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if m is not None: |
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# Attribute selector |
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tag_name, attribute, operator, value = m.groups() |
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checker = self._attribute_checker(operator, attribute, value) |
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elif '#' in token: |
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# ID selector |
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tag_name, tag_id = token.split('#', 1) |
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def id_matches(tag): |
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return tag.get('id', None) == tag_id |
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checker = id_matches |
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elif '.' in token: |
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# Class selector |
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tag_name, klass = token.split('.', 1) |
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classes = set(klass.split('.')) |
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def classes_match(candidate): |
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return classes.issubset(candidate.get('class', [])) |
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checker = classes_match |
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elif ':' in token and not self.quoted_colon.search(token): |
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# Pseudo-class |
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tag_name, pseudo = token.split(':', 1) |
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if tag_name == '': |
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raise ValueError( |
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"A pseudo-class must be prefixed with a tag name.") |
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pseudo_attributes = re.match(r'([a-zA-Z\d-]+)\(([a-zA-Z\d]+)\)', pseudo) |
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found = [] |
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if pseudo_attributes is None: |
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pseudo_type = pseudo |
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pseudo_value = None |
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else: |
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pseudo_type, pseudo_value = pseudo_attributes.groups() |
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if pseudo_type == 'nth-of-type': |
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try: |
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pseudo_value = int(pseudo_value) |
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except: |
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if limit is None: |
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limit = 0 |
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if soupsieve is None: |
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raise NotImplementedError( |
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'Only numeric values are currently supported for the nth-of-type pseudo-class.') |
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if pseudo_value < 1: |
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raise ValueError( |
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'nth-of-type pseudo-class value must be at least 1.') |
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|
class Counter(object): |
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def __init__(self, destination): |
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self.count = 0 |
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self.destination = destination |
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def nth_child_of_type(self, tag): |
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self.count += 1 |
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if self.count == self.destination: |
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return True |
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|
else: |
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|
return False |
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|
checker = Counter(pseudo_value).nth_child_of_type |
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|
else: |
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|
raise NotImplementedError( |
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|
'Only the following pseudo-classes are implemented: nth-of-type.') |
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|
|
|
elif token == '*': |
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|
# Star selector -- matches everything |
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|
pass |
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|
elif token == '>': |
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|
# Run the next token as a CSS selector against the |
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|
|
# direct children of each tag in the current context. |
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|
recursive_candidate_generator = lambda tag: tag.children |
|
|
|
elif token == '~': |
|
|
|
# Run the next token as a CSS selector against the |
|
|
|
# siblings of each tag in the current context. |
|
|
|
recursive_candidate_generator = lambda tag: tag.next_siblings |
|
|
|
elif token == '+': |
|
|
|
# For each tag in the current context, run the next |
|
|
|
# token as a CSS selector against the tag's next |
|
|
|
# sibling that's a tag. |
|
|
|
def next_tag_sibling(tag): |
|
|
|
yield tag.find_next_sibling(True) |
|
|
|
recursive_candidate_generator = next_tag_sibling |
|
|
|
|
|
|
|
elif self.tag_name_re.match(token): |
|
|
|
# Just a tag name. |
|
|
|
tag_name = token |
|
|
|
else: |
|
|
|
raise ValueError( |
|
|
|
'Unsupported or invalid CSS selector: "%s"' % token) |
|
|
|
if recursive_candidate_generator: |
|
|
|
# This happens when the selector looks like "> foo". |
|
|
|
# |
|
|
|
# The generator calls select() recursively on every |
|
|
|
# member of the current context, passing in a different |
|
|
|
# candidate generator and a different selector. |
|
|
|
# |
|
|
|
# In the case of "> foo", the candidate generator is |
|
|
|
# one that yields a tag's direct children (">"), and |
|
|
|
# the selector is "foo". |
|
|
|
next_token = tokens[index+1] |
|
|
|
def recursive_select(tag): |
|
|
|
if self._select_debug: |
|
|
|
print ' Calling select("%s") recursively on %s %s' % (next_token, tag.name, tag.attrs) |
|
|
|
print '-' * 40 |
|
|
|
for i in tag.select(next_token, recursive_candidate_generator): |
|
|
|
if self._select_debug: |
|
|
|
print '(Recursive select picked up candidate %s %s)' % (i.name, i.attrs) |
|
|
|
yield i |
|
|
|
if self._select_debug: |
|
|
|
print '-' * 40 |
|
|
|
_use_candidate_generator = recursive_select |
|
|
|
elif _candidate_generator is None: |
|
|
|
# By default, a tag's candidates are all of its |
|
|
|
# children. If tag_name is defined, only yield tags |
|
|
|
# with that name. |
|
|
|
if self._select_debug: |
|
|
|
if tag_name: |
|
|
|
check = "[any]" |
|
|
|
else: |
|
|
|
check = tag_name |
|
|
|
print ' Default candidate generator, tag name="%s"' % check |
|
|
|
if self._select_debug: |
|
|
|
# This is redundant with later code, but it stops |
|
|
|
# a bunch of bogus tags from cluttering up the |
|
|
|
# debug log. |
|
|
|
def default_candidate_generator(tag): |
|
|
|
for child in tag.descendants: |
|
|
|
if not isinstance(child, Tag): |
|
|
|
continue |
|
|
|
if tag_name and not child.name == tag_name: |
|
|
|
continue |
|
|
|
yield child |
|
|
|
_use_candidate_generator = default_candidate_generator |
|
|
|
else: |
|
|
|
_use_candidate_generator = lambda tag: tag.descendants |
|
|
|
else: |
|
|
|
_use_candidate_generator = _candidate_generator |
|
|
|
|
|
|
|
count = 0 |
|
|
|
for tag in current_context: |
|
|
|
if self._select_debug: |
|
|
|
print " Running candidate generator on %s %s" % ( |
|
|
|
tag.name, repr(tag.attrs)) |
|
|
|
for candidate in _use_candidate_generator(tag): |
|
|
|
if not isinstance(candidate, Tag): |
|
|
|
continue |
|
|
|
if tag_name and candidate.name != tag_name: |
|
|
|
continue |
|
|
|
if checker is not None: |
|
|
|
try: |
|
|
|
result = checker(candidate) |
|
|
|
except StopIteration: |
|
|
|
# The checker has decided we should no longer |
|
|
|
# run the generator. |
|
|
|
break |
|
|
|
if checker is None or result: |
|
|
|
if self._select_debug: |
|
|
|
print " SUCCESS %s %s" % (candidate.name, repr(candidate.attrs)) |
|
|
|
if id(candidate) not in new_context_ids: |
|
|
|
# If a tag matches a selector more than once, |
|
|
|
# don't include it in the context more than once. |
|
|
|
new_context.append(candidate) |
|
|
|
new_context_ids.add(id(candidate)) |
|
|
|
elif self._select_debug: |
|
|
|
print " FAILURE %s %s" % (candidate.name, repr(candidate.attrs)) |
|
|
|
|
|
|
|
current_context = new_context |
|
|
|
if limit and len(current_context) >= limit: |
|
|
|
current_context = current_context[:limit] |
|
|
|
|
|
|
|
if self._select_debug: |
|
|
|
print "Final verdict:" |
|
|
|
for i in current_context: |
|
|
|
print " %s %s" % (i.name, i.attrs) |
|
|
|
return current_context |
|
|
|
"Cannot execute CSS selectors because the soupsieve package is not installed." |
|
|
|
) |
|
|
|
|
|
|
|
return soupsieve.select(selector, self, namespaces, limit, **kwargs) |
|
|
|
|
|
|
|
# Old names for backwards compatibility |
|
|
|
def childGenerator(self): |
|
|
|
@ -1689,7 +1425,7 @@ class SoupStrainer(object): |
|
|
|
def _normalize_search_value(self, value): |
|
|
|
# Leave it alone if it's a Unicode string, a callable, a |
|
|
|
# regular expression, a boolean, or None. |
|
|
|
if (isinstance(value, unicode) or callable(value) or hasattr(value, 'match') |
|
|
|
if (isinstance(value, unicode) or isinstance(value, Callable) or hasattr(value, 'match') |
|
|
|
or isinstance(value, bool) or value is None): |
|
|
|
return value |
|
|
|
|
|
|
|
|
JackDandy
6 years ago