|
| 1 | +# -*- coding: utf-8 -*- |
| 2 | + |
| 3 | +""" |
| 4 | +omijson.core |
| 5 | +~~~~~~~~~~~~ |
| 6 | +
|
| 7 | +This module provides the core omnijson functionality. |
| 8 | +
|
| 9 | +""" |
| 10 | + |
| 11 | +import sys |
| 12 | + |
| 13 | +engine = None |
| 14 | +_engine = None |
| 15 | + |
| 16 | + |
| 17 | +options = [ |
| 18 | + ['ujson', 'loads', 'dumps', (ValueError,)], |
| 19 | + ['yajl', 'loads', 'dumps', (TypeError, ValueError)], |
| 20 | + ['jsonlib2', 'read', 'write', (ValueError,)], |
| 21 | + ['jsonlib', 'read', 'write', (ValueError,)], |
| 22 | + ['simplejson', 'loads', 'dumps', (TypeError, ValueError)], |
| 23 | + ['json', 'loads', 'dumps', (TypeError, ValueError)], |
| 24 | + ['simplejson_from_packages', 'loads', 'dumps', (ValueError,)], |
| 25 | +] |
| 26 | + |
| 27 | + |
| 28 | +def _import(engine): |
| 29 | + try: |
| 30 | + if '_from_' in engine: |
| 31 | + engine, package = engine.split('_from_') |
| 32 | + m = __import__(package, globals(), locals(), [engine], -1) |
| 33 | + return getattr(m, engine) |
| 34 | + |
| 35 | + return __import__(engine) |
| 36 | + |
| 37 | + except ImportError: |
| 38 | + return False |
| 39 | + |
| 40 | + |
| 41 | +def loads(s, **kwargs): |
| 42 | + """Loads JSON object.""" |
| 43 | + |
| 44 | + try: |
| 45 | + return _engine[0](s) |
| 46 | + |
| 47 | + except: |
| 48 | + # crazy 2/3 exception hack |
| 49 | + # http://www.voidspace.org.uk/python/weblog/arch_d7_2010_03_20.shtml |
| 50 | + |
| 51 | + ExceptionClass, why = sys.exc_info()[:2] |
| 52 | + |
| 53 | + if any([(issubclass(ExceptionClass, e)) for e in _engine[2]]): |
| 54 | + raise JSONError(why) |
| 55 | + else: |
| 56 | + raise why |
| 57 | + |
| 58 | + |
| 59 | +def dumps(o, **kwargs): |
| 60 | + """Dumps JSON object.""" |
| 61 | + |
| 62 | + try: |
| 63 | + return _engine[1](o) |
| 64 | + |
| 65 | + except: |
| 66 | + ExceptionClass, why = sys.exc_info()[:2] |
| 67 | + |
| 68 | + if any([(issubclass(ExceptionClass, e)) for e in _engine[2]]): |
| 69 | + raise JSONError(why) |
| 70 | + else: |
| 71 | + raise why |
| 72 | + |
| 73 | + |
| 74 | +class JSONError(ValueError): |
| 75 | + """JSON Failed.""" |
| 76 | + |
| 77 | + |
| 78 | +# ------ |
| 79 | +# Magic! |
| 80 | +# ------ |
| 81 | + |
| 82 | + |
| 83 | +for e in options: |
| 84 | + |
| 85 | + __engine = _import(e[0]) |
| 86 | + |
| 87 | + if __engine: |
| 88 | + engine, _engine = e[0], e[1:4] |
| 89 | + |
| 90 | + for i in (0, 1): |
| 91 | + _engine[i] = getattr(__engine, _engine[i]) |
| 92 | + |
| 93 | + break |
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