author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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"""Registration facilities for DOM. This module should not be used |
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directly. Instead, the functions getDOMImplementation and |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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registerDOMImplementation should be imported from xml.dom.""" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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from xml.dom.minicompat import * # isinstance, StringTypes |
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# This is a list of well-known implementations. Well-known names |
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# should be published by posting to xml-sig@python.org, and are |
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# subsequently recorded in this file. |
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well_known_implementations = { |
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'minidom':'xml.dom.minidom', |
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'4DOM': 'xml.dom.DOMImplementation', |
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} |
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# DOM implementations not officially registered should register |
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# themselves with their |
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registered = {} |
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|
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def registerDOMImplementation(name, factory): |
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"""registerDOMImplementation(name, factory) |
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|
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Register the factory function with the name. The factory function |
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should return an object which implements the DOMImplementation |
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interface. The factory function can either return the same object, |
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or a new one (e.g. if that implementation supports some |
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customization).""" |
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registered[name] = factory |
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def _good_enough(dom, features): |
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"_good_enough(dom, features) -> Return 1 if the dom offers the features" |
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for f,v in features: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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if not dom.hasFeature(f,v): |
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return 0 |
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return 1 |
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def getDOMImplementation(name = None, features = ()): |
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"""getDOMImplementation(name = None, features = ()) -> DOM implementation. |
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|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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Return a suitable DOM implementation. The name is either |
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well-known, the module name of a DOM implementation, or None. If |
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it is not None, imports the corresponding module and returns |
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DOMImplementation object if the import succeeds. |
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|
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If name is not given, consider the available implementations to |
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find one with the required feature set. If no implementation can |
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be found, raise an ImportError. The features list must be a sequence |
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of (feature, version) pairs which are passed to hasFeature.""" |
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import os |
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creator = None |
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mod = well_known_implementations.get(name) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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if mod: |
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mod = __import__(mod, {}, {}, ['getDOMImplementation']) |
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return mod.getDOMImplementation() |
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elif name: |
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return registered[name]() |
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elif os.environ.has_key("PYTHON_DOM"): |
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return getDOMImplementation(name = os.environ["PYTHON_DOM"]) |
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|
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# User did not specify a name, try implementations in arbitrary |
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# order, returning the one that has the required features |
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if isinstance(features, StringTypes): |
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features = _parse_feature_string(features) |
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for creator in registered.values(): |
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dom = creator() |
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if _good_enough(dom, features): |
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return dom |
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|
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for creator in well_known_implementations.keys(): |
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try: |
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dom = getDOMImplementation(name = creator) |
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except StandardError: # typically ImportError, or AttributeError |
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continue |
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if _good_enough(dom, features): |
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return dom |
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|
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raise ImportError,"no suitable DOM implementation found" |
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81 |
|
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def _parse_feature_string(s): |
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features = [] |
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parts = s.split() |
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i = 0 |
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length = len(parts) |
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while i < length: |
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feature = parts[i] |
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if feature[0] in "0123456789": |
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raise ValueError, "bad feature name: %r" % (feature,) |
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i = i + 1 |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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version = None |
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if i < length: |
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v = parts[i] |
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if v[0] in "0123456789": |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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i = i + 1 |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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version = v |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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features.append((feature, version)) |
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return tuple(features) |