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90 lines
2.8 KiB
Python
90 lines
2.8 KiB
Python
# todo make sure what they mean by desc undefined? None or empty? Answer: None :) it can never be empty but None is sometimes returned.
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# I am implementing everything as dicts to speed up property creation
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# Warning: value, get, set props of dest are PyJs types. Rest is Py!
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def is_data_descriptor(desc):
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return desc and ('value' in desc or 'writable' in desc)
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def is_accessor_descriptor(desc):
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return desc and ('get' in desc or 'set' in desc)
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def is_generic_descriptor(
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desc
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): # generic means not the data and not the setter - therefore it must be one that changes only enum and conf
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return desc and not (is_data_descriptor(desc)
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or is_accessor_descriptor(desc))
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def from_property_descriptor(desc, space):
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if not desc:
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return {}
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obj = space.NewObject()
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if is_data_descriptor(desc):
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obj.define_own_property(
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'value', {
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'value': desc['value'],
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'writable': True,
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'enumerable': True,
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'configurable': True
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}, False)
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obj.define_own_property(
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'writable', {
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'value': desc['writable'],
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'writable': True,
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'enumerable': True,
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'configurable': True
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}, False)
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else:
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obj.define_own_property(
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'get', {
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'value': desc['get'],
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'writable': True,
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'enumerable': True,
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'configurable': True
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}, False)
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obj.define_own_property(
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'set', {
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'value': desc['set'],
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'writable': True,
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'enumerable': True,
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'configurable': True
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}, False)
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obj.define_own_property(
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'writable', {
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'value': desc['writable'],
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'writable': True,
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'enumerable': True,
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'configurable': True
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}, False)
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obj.define_own_property(
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'enumerable', {
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'value': desc['enumerable'],
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'writable': True,
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'enumerable': True,
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'configurable': True
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}, False)
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return obj
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def to_property_descriptor(obj):
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if obj._type() != 'Object':
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raise TypeError()
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desc = {}
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for e in ('enumerable', 'configurable', 'writable'):
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if obj.has_property(e):
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desc[e] = obj.get(e).to_boolean().value
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if obj.has_property('value'):
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desc['value'] = obj.get('value')
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for e in ('get', 'set'):
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if obj.has_property(e):
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cand = obj.get(e)
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if not (cand.is_callable() or cand.is_undefined()):
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raise TypeError()
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if ('get' in desc or 'set' in desc) and ('value' in desc
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or 'writable' in desc):
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raise TypeError()
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