Show More
Commit Description:
merge with algo and add brython files that were missing
Commit Description:
merge with algo and add brython files that were missing
References:
File last commit:
Show/Diff file:
Action:
lib/assets/Lib/xml/dom/domreg.py
| 97 lines
| 3.4 KiB
| text/x-python
| PythonLexer
|
| r584 | """Registration facilities for DOM. This module should not be used | |||
| directly. Instead, the functions getDOMImplementation and | ||||
| registerDOMImplementation should be imported from xml.dom.""" | ||||
| # This is a list of well-known implementations. Well-known names | ||||
| # should be published by posting to xml-sig@python.org, and are | ||||
| # subsequently recorded in this file. | ||||
| well_known_implementations = { | ||||
| 'minidom':'xml.dom.minidom', | ||||
| '4DOM': 'xml.dom.DOMImplementation', | ||||
| } | ||||
| # DOM implementations not officially registered should register | ||||
| # themselves with their | ||||
| registered = {} | ||||
| def registerDOMImplementation(name, factory): | ||||
| """registerDOMImplementation(name, factory) | ||||
| Register the factory function with the name. The factory function | ||||
| should return an object which implements the DOMImplementation | ||||
| interface. The factory function can either return the same object, | ||||
| or a new one (e.g. if that implementation supports some | ||||
| customization).""" | ||||
| registered[name] = factory | ||||
| def _good_enough(dom, features): | ||||
| "_good_enough(dom, features) -> Return 1 if the dom offers the features" | ||||
| for f,v in features: | ||||
| if not dom.hasFeature(f,v): | ||||
| return 0 | ||||
| return 1 | ||||
| def getDOMImplementation(name=None, features=()): | ||||
| """getDOMImplementation(name = None, features = ()) -> DOM implementation. | ||||
| Return a suitable DOM implementation. The name is either | ||||
| well-known, the module name of a DOM implementation, or None. If | ||||
| it is not None, imports the corresponding module and returns | ||||
| DOMImplementation object if the import succeeds. | ||||
| If name is not given, consider the available implementations to | ||||
| find one with the required feature set. If no implementation can | ||||
| be found, raise an ImportError. The features list must be a sequence | ||||
| of (feature, version) pairs which are passed to hasFeature.""" | ||||
| import os | ||||
| creator = None | ||||
| mod = well_known_implementations.get(name) | ||||
| if mod: | ||||
| mod = __import__(mod, {}, {}, ['getDOMImplementation']) | ||||
| return mod.getDOMImplementation() | ||||
| elif name: | ||||
| return registered[name]() | ||||
| elif "PYTHON_DOM" in os.environ: | ||||
| return getDOMImplementation(name = os.environ["PYTHON_DOM"]) | ||||
| # User did not specify a name, try implementations in arbitrary | ||||
| # order, returning the one that has the required features | ||||
| if isinstance(features, str): | ||||
| features = _parse_feature_string(features) | ||||
| for creator in registered.values(): | ||||
| dom = creator() | ||||
| if _good_enough(dom, features): | ||||
| return dom | ||||
| for creator in well_known_implementations.keys(): | ||||
| try: | ||||
| dom = getDOMImplementation(name = creator) | ||||
| except Exception: # typically ImportError, or AttributeError | ||||
| continue | ||||
| if _good_enough(dom, features): | ||||
| return dom | ||||
| raise ImportError("no suitable DOM implementation found") | ||||
| def _parse_feature_string(s): | ||||
| features = [] | ||||
| parts = s.split() | ||||
| i = 0 | ||||
| length = len(parts) | ||||
| while i < length: | ||||
| feature = parts[i] | ||||
| if feature[0] in "0123456789": | ||||
| raise ValueError("bad feature name: %r" % (feature,)) | ||||
| i = i + 1 | ||||
| version = None | ||||
| if i < length: | ||||
| v = parts[i] | ||||
| if v[0] in "0123456789": | ||||
| i = i + 1 | ||||
| version = v | ||||
| features.append((feature, version)) | ||||
| return tuple(features) | ||||