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base.py

from __future__ import absolute_import, division, unicode_literals
from pip._vendor.six import text_type

from ..constants import scopingElements, tableInsertModeElements, namespaces

# The scope markers are inserted when entering object elements,
# marquees, table cells, and table captions, and are used to prevent formatting
# from "leaking" into tables, object elements, and marquees.
Marker = None

listElementsMap = {
    None: (frozenset(scopingElements), False),
    "button": (frozenset(scopingElements | {(namespaces["html"], "button")}), False),
    "list": (frozenset(scopingElements | {(namespaces["html"], "ol"),
                                          (namespaces["html"], "ul")}), False),
    "table": (frozenset([(namespaces["html"], "html"),
                         (namespaces["html"], "table")]), False),
    "select": (frozenset([(namespaces["html"], "optgroup"),
                          (namespaces["html"], "option")]), True)
}

class Node(object):
    """Represents an item in the tree"""
    def __init__(self, name):
        """Creates a Node

:arg name: The tag name associated with the node

"""
        # The tag name associated with the node
        self.name = name
        # The parent of the current node (or None for the document node)
        self.parent = None
        # The value of the current node (applies to text nodes and comments)
        self.value = None
        # A dict holding name -> value pairs for attributes of the node
        self.attributes = {}
        # A list of child nodes of the current node. This must include all
        # elements but not necessarily other node types.
        self.childNodes = []
        # A list of miscellaneous flags that can be set on the node.
        self._flags = []

def __str__(self):
        attributesStr = " ".join(["%s=\"%s\"" % (name, value)
                                  for name, value in
                                  self.attributes.items()])
        if attributesStr:
            return "<%s %s>" % (self.name, attributesStr)
        else:
            return "<%s>" % (self.name)

def __repr__(self):
        return "<%s>" % (self.name)

def appendChild(self, node):
        """Insert node as a child of the current node

:arg node: the node to insert

"""
        raise NotImplementedError

def insertText(self, data, insertBefore=None):
        """Insert data as text in the current node, positioned before the
        start of node insertBefore or to the end of the node's text.

:arg data: the data to insert

:arg insertBefore: True if you want to insert the text before the node
            and False if you want to insert it after the node

"""
        raise NotImplementedError

def insertBefore(self, node, refNode):
        """Insert node as a child of the current node, before refNode in the
        list of child nodes. Raises ValueError if refNode is not a child of
        the current node

:arg node: the node to insert

:arg refNode: the child node to insert the node before

"""
        raise NotImplementedError

def removeChild(self, node):
        """Remove node from the children of the current node

:arg node: the child node to remove

"""
        raise NotImplementedError

def reparentChildren(self, newParent):
        """Move all the children of the current node to newParent.
        This is needed so that trees that don't store text as nodes move the
        text in the correct way

:arg newParent: the node to move all this node's children to

"""
        # XXX - should this method be made more general?
        for child in self.childNodes:
            newParent.appendChild(child)
        self.childNodes = []

def cloneNode(self):
        """Return a shallow copy of the current node i.e. a node with the same
        name and attributes but with no parent or child nodes
        """
        raise NotImplementedError

def hasContent(self):
        """Return true if the node has children or text, false otherwise
        """
        raise NotImplementedError

class ActiveFormattingElements(list):
    def append(self, node):
        equalCount = 0
        if node != Marker:
            for element in self[::-1]:
                if element == Marker:
                    break
                if self.nodesEqual(element, node):
                    equalCount += 1
                if equalCount == 3:
                    self.remove(element)
                    break
        list.append(self, node)

def nodesEqual(self, node1, node2):
        if not node1.nameTuple == node2.nameTuple:
            return False

if not node1.attributes == node2.attributes:
            return False

return True

class TreeBuilder(object):
    """Base treebuilder implementation

* documentClass - the class to use for the bottommost node of a document
    * elementClass - the class to use for HTML Elements
    * commentClass - the class to use for comments
    * doctypeClass - the class to use for doctypes

"""
    # pylint:disable=not-callable

# Document class
    documentClass = None

# The class to use for creating a node
    elementClass = None

# The class to use for creating comments
    commentClass = None

# The class to use for creating doctypes
    doctypeClass = None

# Fragment class
    fragmentClass = None

def __init__(self, namespaceHTMLElements):
        """Create a TreeBuilder

:arg namespaceHTMLElements: whether or not to namespace HTML elements

"""
        if namespaceHTMLElements:
            self.defaultNamespace = "http://www.w3.org/1999/xhtml"
        else:
            self.defaultNamespace = None
        self.reset()

def reset(self):
        self.openElements = []
        self.activeFormattingElements = ActiveFormattingElements()

# XXX - rename these to headElement, formElement
        self.headPointer = None
        self.formPointer = None

self.insertFromTable = False

self.document = self.documentClass()

def elementInScope(self, target, variant=None):

# If we pass a node in we match that. if we pass a string
        # match any node with that name
        exactNode = hasattr(target, "nameTuple")
        if not exactNode:
            if isinstance(target, text_type):
                target = (namespaces["html"], target)
            assert isinstance(target, tuple)

listElements, invert = listElementsMap[variant]

for node in reversed(self.openElements):
            if exactNode and node == target:
                return True
            elif not exactNode and node.nameTuple == target:
                return True
            elif (invert ^ (node.nameTuple in listElements)):
                return False

assert False  # We should never reach this point

def reconstructActiveFormattingElements(self):
        # Within this algorithm the order of steps described in the
        # specification is not quite the same as the order of steps in the
        # code. It should still do the same though.

# Step 1: stop the algorithm when there's nothing to do.
        if not self.activeFormattingElements:
            return

# Step 2 and step 3: we start with the last element. So i is -1.
        i = len(self.activeFormattingElements) - 1
        entry = self.activeFormattingElements[i]
        if entry == Marker or entry in self.openElements:
            return

# Step 6
        while entry != Marker and entry not in self.openElements:
            if i == 0:
                # This will be reset to 0 below
                i = -1
                break
            i -= 1
            # Step 5: let entry be one earlier in the list.
            entry = self.activeFormattingElements[i]

while True:
            # Step 7
            i += 1

# Step 8
            entry = self.activeFormattingElements[i]
            clone = entry.cloneNode()  # Mainly to get a new copy of the attributes

# Step 9
            element = self.insertElement({"type": "StartTag",
                                          "name": clone.name,
                                          "namespace": clone.namespace,
                                          "data": clone.attributes})

# Step 10
            self.activeFormattingElements[i] = element

# Step 11
            if element == self.activeFormattingElements[-1]:
                break

def clearActiveFormattingElements(self):
        entry = self.activeFormattingElements.pop()
        while self.activeFormattingElements and entry != Marker:
            entry = self.activeFormattingElements.pop()

def elementInActiveFormattingElements(self, name):
        """Check if an element exists between the end of the active
        formatting elements and the last marker. If it does, return it, else
        return false"""

for item in self.activeFormattingElements[::-1]:
            # Check for Marker first because if it's a Marker it doesn't have a
            # name attribute.
            if item == Marker:
                break
            elif item.name == name:
                return item
        return False

def insertRoot(self, token):
        element = self.createElement(token)
        self.openElements.append(element)
        self.document.appendChild(element)

def insertDoctype(self, token):
        name = token["name"]
        publicId = token["publicId"]
        systemId = token["systemId"]

doctype = self.doctypeClass(name, publicId, systemId)
        self.document.appendChild(doctype)

def insertComment(self, token, parent=None):
        if parent is None:
            parent = self.openElements[-1]
        parent.appendChild(self.commentClass(token["data"]))

def createElement(self, token):
        """Create an element but don't insert it anywhere"""
        name = token["name"]
        namespace = token.get("namespace", self.defaultNamespace)
        element = self.elementClass(name, namespace)
        element.attributes = token["data"]
        return element

def _getInsertFromTable(self):
        return self._insertFromTable

def _setInsertFromTable(self, value):
        """Switch the function used to insert an element from the
        normal one to the misnested table one and back again"""
        self._insertFromTable = value
        if value:
            self.insertElement = self.insertElementTable
        else:
            self.insertElement = self.insertElementNormal

insertFromTable = property(_getInsertFromTable, _setInsertFromTable)

def insertElementNormal(self, token):
        name = token["name"]
        assert isinstance(name, text_type), "Element %s not unicode" % name
        namespace = token.get("namespace", self.defaultNamespace)
        element = self.elementClass(name, namespace)
        element.attributes = token["data"]
        self.openElements[-1].appendChild(element)
        self.openElements.append(element)
        return element

def insertElementTable(self, token):
        """Create an element and insert it into the tree"""
        element = self.createElement(token)
        if self.openElements[-1].name not in tableInsertModeElements:
            return self.insertElementNormal(token)
        else:
            # We should be in the InTable mode. This means we want to do
            # special magic element rearranging
            parent, insertBefore = self.getTableMisnestedNodePosition()
            if insertBefore is None:
                parent.appendChild(element)
            else:
                parent.insertBefore(element, insertBefore)
            self.openElements.append(element)
        return element

def insertText(self, data, parent=None):
        """Insert text data."""
        if parent is None:
            parent = self.openElements[-1]

if (not self.insertFromTable or (self.insertFromTable and
                                         self.openElements[-1].name
                                         not in tableInsertModeElements)):
            parent.insertText(data)
        else:
            # We should be in the InTable mode. This means we want to do
            # special magic element rearranging
            parent, insertBefore = self.getTableMisnestedNodePosition()
            parent.insertText(data, insertBefore)

def getTableMisnestedNodePosition(self):
        """Get the foster parent element, and sibling to insert before
        (or None) when inserting a misnested table node"""
        # The foster parent element is the one which comes before the most
        # recently opened table element
        # XXX - this is really inelegant
        lastTable = None
        fosterParent = None
        insertBefore = None
        for elm in self.openElements[::-1]:
            if elm.name == "table":
                lastTable = elm
                break
        if lastTable:
            # XXX - we should really check that this parent is actually a
            # node here
            if lastTable.parent:
                fosterParent = lastTable.parent
                insertBefore = lastTable
            else:
                fosterParent = self.openElements[
                    self.openElements.index(lastTable) - 1]
        else:
            fosterParent = self.openElements[0]
        return fosterParent, insertBefore

def generateImpliedEndTags(self, exclude=None):
        name = self.openElements[-1].name
        # XXX td, th and tr are not actually needed
        if (name in frozenset(("dd", "dt", "li", "option", "optgroup", "p", "rp", "rt")) and
                name != exclude):
            self.openElements.pop()
            # XXX This is not entirely what the specification says. We should
            # investigate it more closely.
            self.generateImpliedEndTags(exclude)

def getDocument(self):
        """Return the final tree"""
        return self.document

def getFragment(self):
        """Return the final fragment"""
        # assert self.innerHTML
        fragment = self.fragmentClass()
        self.openElements[0].reparentChildren(fragment)
        return fragment

def testSerializer(self, node):
        """Serialize the subtree of node in the format required by unit tests

:arg node: the node from which to start serializing

"""
        raise NotImplementedError

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2024-03-03 10:36:51
..	dir	-	root/linksafe	0755	2024-03-03 10:36:51
__pycache__	dir	-	root/linksafe	0755	2024-03-03 10:36:51
__init__.py	text/plain	3.51 KB	root/linksafe	0644	2023-11-13 09:24:38
base.py	text/x-script.python	14.22 KB	root/linksafe	0644	2023-11-13 09:24:38
dom.py	text/x-script.python	8.72 KB	root/linksafe	0644	2023-11-13 09:24:38
etree.py	text/x-script.python	12.54 KB	root/linksafe	0644	2023-11-13 09:24:38
etree_lxml.py	text/plain	14.42 KB	root/linksafe	0644	2023-11-13 09:24:38

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