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57 lines
2.3 KiB
Python
57 lines
2.3 KiB
Python
"""A collection of modules for iterating through different kinds of
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tree, generating tokens identical to those produced by the tokenizer
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module.
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To create a tree walker for a new type of tree, you need to do
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implement a tree walker object (called TreeWalker by convention) that
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implements a 'serialize' method taking a tree as sole argument and
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returning an iterator generating tokens.
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"""
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from __future__ import absolute_import, division, unicode_literals
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import sys
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from ..utils import default_etree
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treeWalkerCache = {}
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def getTreeWalker(treeType, implementation=None, **kwargs):
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"""Get a TreeWalker class for various types of tree with built-in support
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treeType - the name of the tree type required (case-insensitive). Supported
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values are:
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"dom" - The xml.dom.minidom DOM implementation
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"pulldom" - The xml.dom.pulldom event stream
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"etree" - A generic walker for tree implementations exposing an
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elementtree-like interface (known to work with
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ElementTree, cElementTree and lxml.etree).
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"lxml" - Optimized walker for lxml.etree
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"genshi" - a Genshi stream
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implementation - (Currently applies to the "etree" tree type only). A module
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implementing the tree type e.g. xml.etree.ElementTree or
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cElementTree."""
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treeType = treeType.lower()
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if treeType not in treeWalkerCache:
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if treeType in ("dom", "pulldom"):
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name = "%s.%s" % (__name__, treeType)
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__import__(name)
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mod = sys.modules[name]
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treeWalkerCache[treeType] = mod.TreeWalker
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elif treeType == "genshi":
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from . import genshistream
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treeWalkerCache[treeType] = genshistream.TreeWalker
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elif treeType == "lxml":
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from . import lxmletree
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treeWalkerCache[treeType] = lxmletree.TreeWalker
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elif treeType == "etree":
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from . import etree
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if implementation is None:
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implementation = default_etree
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# XXX: NEVER cache here, caching is done in the etree submodule
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return etree.getETreeModule(implementation, **kwargs).TreeWalker
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return treeWalkerCache.get(treeType)
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