Mercurial > cpython-lru_cache-weakref

annotate Lib/json/encoder.py @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents ef47df25423c
children d95e5add3ca4
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rev   line source
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1 """Implementation of JSONEncoder
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2 """
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3
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4 import re
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5 import math
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6
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7 try:
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8 from _json import encode_basestring_ascii as c_encode_basestring_ascii
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9 except ImportError:
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10 c_encode_basestring_ascii = None
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11
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12 __all__ = ['JSONEncoder']
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13
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14 ESCAPE = re.compile(r'[\x00-\x1f\\"\b\f\n\r\t]')
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15 ESCAPE_ASCII = re.compile(r'([\\"]|[^\ -~])')
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16 HAS_UTF8 = re.compile(r'[\x80-\xff]')
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17 ESCAPE_DCT = {
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18 '\\': '\\\\',
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19 '"': '\\"',
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20 '\b': '\\b',
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21 '\f': '\\f',
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22 '\n': '\\n',
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23 '\r': '\\r',
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24 '\t': '\\t',
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25 }
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26 for i in range(0x20):
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27 ESCAPE_DCT.setdefault(chr(i), '\\u{0:04x}'.format(i))
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28
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29 FLOAT_REPR = repr
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30
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31 def floatstr(o, allow_nan=True):
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32 # Check for specials. Note that this type of test is processor- and/or
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33 # platform-specific, so do tests which don't depend on the internals.
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34
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35 if math.isnan(o):
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36 text = 'NaN'
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37 elif math.isinf(o):
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38 if math.copysign(1., o) == 1.:
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39 text = 'Infinity'
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40 else:
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41 text = '-Infinity'
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42 else:
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43 return FLOAT_REPR(o)
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44
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45 if not allow_nan:
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46 msg = "Out of range float values are not JSON compliant: " + repr(o)
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47 raise ValueError(msg)
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48
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49 return text
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50
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51
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52 def encode_basestring(s):
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53 """Return a JSON representation of a Python string
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54
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55 """
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56 def replace(match):
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57 return ESCAPE_DCT[match.group(0)]
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58 return '"' + ESCAPE.sub(replace, s) + '"'
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59
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60
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61 def py_encode_basestring_ascii(s):
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62 if isinstance(s, str) and HAS_UTF8.search(s) is not None:
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63 s = s.decode('utf-8')
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64 def replace(match):
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65 s = match.group(0)
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66 try:
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67 return ESCAPE_DCT[s]
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68 except KeyError:
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69 n = ord(s)
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70 if n < 0x10000:
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71 return '\\u{0:04x}'.format(n)
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72 else:
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73 # surrogate pair
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74 n -= 0x10000
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75 s1 = 0xd800 | ((n >> 10) & 0x3ff)
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76 s2 = 0xdc00 | (n & 0x3ff)
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77 return '\\u{0:04x}\\u{1:04x}'.format(s1, s2)
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78 return '"' + str(ESCAPE_ASCII.sub(replace, s)) + '"'
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79
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80
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81 if c_encode_basestring_ascii is not None:
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82 encode_basestring_ascii = c_encode_basestring_ascii
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83 else:
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84 encode_basestring_ascii = py_encode_basestring_ascii
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85
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86
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87 class JSONEncoder(object):
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88 """Extensible JSON <http://json.org> encoder for Python data structures.
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89
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90 Supports the following objects and types by default:
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91
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92 +-------------------+---------------+
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93 | Python | JSON |
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94 +===================+===============+
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95 | dict | object |
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96 +-------------------+---------------+
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97 | list, tuple | array |
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98 +-------------------+---------------+
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99 | str, unicode | string |
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100 +-------------------+---------------+
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101 | int, long, float | number |
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102 +-------------------+---------------+
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103 | True | true |
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104 +-------------------+---------------+
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105 | False | false |
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106 +-------------------+---------------+
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107 | None | null |
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108 +-------------------+---------------+
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109
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110 To extend this to recognize other objects, subclass and implement a
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111 ``.default()`` method with another method that returns a serializable
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112 object for ``o`` if possible, otherwise it should call the superclass
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113 implementation (to raise ``TypeError``).
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114
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115 """
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116 __all__ = ['__init__', 'default', 'encode', 'iterencode']
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117 item_separator = ', '
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118 key_separator = ': '
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119 def __init__(self, skipkeys=False, ensure_ascii=True,
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120 check_circular=True, allow_nan=True, sort_keys=False,
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121 indent=None, separators=None, encoding='utf-8', default=None):
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122 """Constructor for JSONEncoder, with sensible defaults.
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123
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124 If skipkeys is False, then it is a TypeError to attempt
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125 encoding of keys that are not str, int, long, float or None. If
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126 skipkeys is True, such items are simply skipped.
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127
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128 If ensure_ascii is True, the output is guaranteed to be str
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129 objects with all incoming unicode characters escaped. If
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130 ensure_ascii is false, the output will be unicode object.
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131
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132 If check_circular is True, then lists, dicts, and custom encoded
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133 objects will be checked for circular references during encoding to
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
134 prevent an infinite recursion (which would cause an OverflowError).
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
135 Otherwise, no such check takes place.
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
136
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
137 If allow_nan is True, then NaN, Infinity, and -Infinity will be
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
138 encoded as such. This behavior is not JSON specification compliant,
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
139 but is consistent with most JavaScript based encoders and decoders.
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
140 Otherwise, it will be a ValueError to encode such floats.
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
141
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
142 If sort_keys is True, then the output of dictionaries will be
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
143 sorted by key; this is useful for regression tests to ensure
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
144 that JSON serializations can be compared on a day-to-day basis.
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
145
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
146 If indent is a non-negative integer, then JSON array
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
147 elements and object members will be pretty-printed with that
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Brett Cannon <bcannon@gmail.com>
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diff changeset
148 indent level. An indent level of 0 will only insert newlines.
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
149 None is the most compact representation.
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Brett Cannon <bcannon@gmail.com>
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150
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
151 If specified, separators should be a (item_separator, key_separator)
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
152 tuple. The default is (', ', ': '). To get the most compact JSON
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Brett Cannon <bcannon@gmail.com>
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153 representation you should specify (',', ':') to eliminate whitespace.
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Brett Cannon <bcannon@gmail.com>
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diff changeset
154
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Brett Cannon <bcannon@gmail.com>
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155 If specified, default is a function that gets called for objects
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Brett Cannon <bcannon@gmail.com>
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diff changeset
156 that can't otherwise be serialized. It should return a JSON encodable
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Brett Cannon <bcannon@gmail.com>
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157 version of the object or raise a ``TypeError``.
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Brett Cannon <bcannon@gmail.com>
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158
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Brett Cannon <bcannon@gmail.com>
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159 If encoding is not None, then all input strings will be
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Brett Cannon <bcannon@gmail.com>
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160 transformed into unicode using that encoding prior to JSON-encoding.
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Brett Cannon <bcannon@gmail.com>
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161 The default is UTF-8.
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Brett Cannon <bcannon@gmail.com>
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162
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Brett Cannon <bcannon@gmail.com>
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163 """
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Brett Cannon <bcannon@gmail.com>
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164 self.skipkeys = skipkeys
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Brett Cannon <bcannon@gmail.com>
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165 self.ensure_ascii = ensure_ascii
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Brett Cannon <bcannon@gmail.com>
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166 self.check_circular = check_circular
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Brett Cannon <bcannon@gmail.com>
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167 self.allow_nan = allow_nan
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Brett Cannon <bcannon@gmail.com>
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168 self.sort_keys = sort_keys
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Brett Cannon <bcannon@gmail.com>
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169 self.indent = indent
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Brett Cannon <bcannon@gmail.com>
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170 self.current_indent_level = 0
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Brett Cannon <bcannon@gmail.com>
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171 if separators is not None:
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Brett Cannon <bcannon@gmail.com>
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172 self.item_separator, self.key_separator = separators
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Brett Cannon <bcannon@gmail.com>
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173 if default is not None:
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Brett Cannon <bcannon@gmail.com>
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174 self.default = default
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Brett Cannon <bcannon@gmail.com>
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175 self.encoding = encoding
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Brett Cannon <bcannon@gmail.com>
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176
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Brett Cannon <bcannon@gmail.com>
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177 def _newline_indent(self):
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Brett Cannon <bcannon@gmail.com>
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178 return '\n' + (' ' * (self.indent * self.current_indent_level))
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Brett Cannon <bcannon@gmail.com>
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179
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Brett Cannon <bcannon@gmail.com>
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180 def _iterencode_list(self, lst, markers=None):
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Brett Cannon <bcannon@gmail.com>
parents:
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181 if not lst:
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Brett Cannon <bcannon@gmail.com>
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182 yield '[]'
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Brett Cannon <bcannon@gmail.com>
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183 return
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
184 if markers is not None:
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Brett Cannon <bcannon@gmail.com>
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185 markerid = id(lst)
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Brett Cannon <bcannon@gmail.com>
parents:
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186 if markerid in markers:
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Brett Cannon <bcannon@gmail.com>
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187 raise ValueError("Circular reference detected")
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Brett Cannon <bcannon@gmail.com>
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188 markers[markerid] = lst
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Brett Cannon <bcannon@gmail.com>
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189 yield '['
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Brett Cannon <bcannon@gmail.com>
parents:
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190 if self.indent is not None:
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Brett Cannon <bcannon@gmail.com>
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191 self.current_indent_level += 1
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Brett Cannon <bcannon@gmail.com>
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192 newline_indent = self._newline_indent()
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Brett Cannon <bcannon@gmail.com>
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193 separator = self.item_separator + newline_indent
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Brett Cannon <bcannon@gmail.com>
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194 yield newline_indent
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Brett Cannon <bcannon@gmail.com>
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195 else:
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Brett Cannon <bcannon@gmail.com>
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196 newline_indent = None
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Brett Cannon <bcannon@gmail.com>
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197 separator = self.item_separator
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Brett Cannon <bcannon@gmail.com>
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198 first = True
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Brett Cannon <bcannon@gmail.com>
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199 for value in lst:
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Brett Cannon <bcannon@gmail.com>
parents:
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200 if first:
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Brett Cannon <bcannon@gmail.com>
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201 first = False
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Brett Cannon <bcannon@gmail.com>
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202 else:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
203 yield separator
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
204 for chunk in self._iterencode(value, markers):
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
205 yield chunk
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
206 if newline_indent is not None:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
207 self.current_indent_level -= 1
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
208 yield self._newline_indent()
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
209 yield ']'
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
210 if markers is not None:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
211 del markers[markerid]
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
212
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
213 def _iterencode_dict(self, dct, markers=None):
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
214 if not dct:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
215 yield '{}'
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
216 return
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
217 if markers is not None:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
218 markerid = id(dct)
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
219 if markerid in markers:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
220 raise ValueError("Circular reference detected")
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
221 markers[markerid] = dct
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
222 yield '{'
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
223 key_separator = self.key_separator
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
224 if self.indent is not None:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
225 self.current_indent_level += 1
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
226 newline_indent = self._newline_indent()
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
227 item_separator = self.item_separator + newline_indent
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
228 yield newline_indent
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
229 else:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
230 newline_indent = None
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
231 item_separator = self.item_separator
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
232 first = True
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
233 if self.ensure_ascii:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
234 encoder = encode_basestring_ascii
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
235 else:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
236 encoder = encode_basestring
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
237 allow_nan = self.allow_nan
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
238 if self.sort_keys:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
239 keys = dct.keys()
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
240 keys.sort()
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
241 items = [(k, dct[k]) for k in keys]
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
242 else:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
243 items = dct.iteritems()
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
244 _encoding = self.encoding
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
245 _do_decode = (_encoding is not None
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
246 and not (_encoding == 'utf-8'))
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
247 for key, value in items:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
248 if isinstance(key, str):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
249 if _do_decode:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
250 key = key.decode(_encoding)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
251 elif isinstance(key, basestring):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
252 pass
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
253 # JavaScript is weakly typed for these, so it makes sense to
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
254 # also allow them. Many encoders seem to do something like this.
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
255 elif isinstance(key, float):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
256 key = floatstr(key, allow_nan)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
257 elif isinstance(key, (int, long)):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
258 key = str(key)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
259 elif key is True:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
260 key = 'true'
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
261 elif key is False:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
262 key = 'false'
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
263 elif key is None:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
264 key = 'null'
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
265 elif self.skipkeys:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
266 continue
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
267 else:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
268 raise TypeError("key {0!r} is not a string".format(key))
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
269 if first:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
270 first = False
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diff changeset
271 else:
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272 yield item_separator
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Brett Cannon <bcannon@gmail.com>
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273 yield encoder(key)
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274 yield key_separator
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275 for chunk in self._iterencode(value, markers):
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Brett Cannon <bcannon@gmail.com>
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276 yield chunk
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277 if newline_indent is not None:
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Brett Cannon <bcannon@gmail.com>
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278 self.current_indent_level -= 1
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Brett Cannon <bcannon@gmail.com>
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279 yield self._newline_indent()
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280 yield '}'
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Brett Cannon <bcannon@gmail.com>
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281 if markers is not None:
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282 del markers[markerid]
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283
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Brett Cannon <bcannon@gmail.com>
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284 def _iterencode(self, o, markers=None):
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285 if isinstance(o, basestring):
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Brett Cannon <bcannon@gmail.com>
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286 if self.ensure_ascii:
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Brett Cannon <bcannon@gmail.com>
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287 encoder = encode_basestring_ascii
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Brett Cannon <bcannon@gmail.com>
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288 else:
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289 encoder = encode_basestring
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Brett Cannon <bcannon@gmail.com>
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290 _encoding = self.encoding
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291 if (_encoding is not None and isinstance(o, str)
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Brett Cannon <bcannon@gmail.com>
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292 and not (_encoding == 'utf-8')):
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293 o = o.decode(_encoding)
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Brett Cannon <bcannon@gmail.com>
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294 yield encoder(o)
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Brett Cannon <bcannon@gmail.com>
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295 elif o is None:
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Brett Cannon <bcannon@gmail.com>
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296 yield 'null'
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Brett Cannon <bcannon@gmail.com>
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297 elif o is True:
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298 yield 'true'
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299 elif o is False:
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300 yield 'false'
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301 elif isinstance(o, (int, long)):
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Brett Cannon <bcannon@gmail.com>
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302 yield str(o)
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303 elif isinstance(o, float):
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Brett Cannon <bcannon@gmail.com>
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304 yield floatstr(o, self.allow_nan)
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Brett Cannon <bcannon@gmail.com>
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305 elif isinstance(o, (list, tuple)):
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Brett Cannon <bcannon@gmail.com>
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diff changeset
306 for chunk in self._iterencode_list(o, markers):
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Brett Cannon <bcannon@gmail.com>
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307 yield chunk
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Brett Cannon <bcannon@gmail.com>
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308 elif isinstance(o, dict):
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Brett Cannon <bcannon@gmail.com>
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309 for chunk in self._iterencode_dict(o, markers):
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Brett Cannon <bcannon@gmail.com>
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310 yield chunk
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Brett Cannon <bcannon@gmail.com>
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311 else:
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Brett Cannon <bcannon@gmail.com>
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312 if markers is not None:
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313 markerid = id(o)
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Brett Cannon <bcannon@gmail.com>
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314 if markerid in markers:
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Brett Cannon <bcannon@gmail.com>
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315 raise ValueError("Circular reference detected")
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Brett Cannon <bcannon@gmail.com>
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316 markers[markerid] = o
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Brett Cannon <bcannon@gmail.com>
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diff changeset
317 for chunk in self._iterencode_default(o, markers):
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Brett Cannon <bcannon@gmail.com>
parents:
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318 yield chunk
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Brett Cannon <bcannon@gmail.com>
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diff changeset
319 if markers is not None:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
320 del markers[markerid]
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
321
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
322 def _iterencode_default(self, o, markers=None):
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
323 newobj = self.default(o)
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
324 return self._iterencode(newobj, markers)
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
325
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Brett Cannon <bcannon@gmail.com>
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diff changeset
326 def default(self, o):
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Brett Cannon <bcannon@gmail.com>
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327 """Implement this method in a subclass such that it returns a serializable
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
328 object for ``o``, or calls the base implementation (to raise a
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
329 ``TypeError``).
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Brett Cannon <bcannon@gmail.com>
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diff changeset
330
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
331 For example, to support arbitrary iterators, you could implement
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
332 default like this::
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
333
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
334 def default(self, o):
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
335 try:
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Brett Cannon <bcannon@gmail.com>
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diff changeset
336 iterable = iter(o)
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
337 except TypeError:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
338 pass
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
339 else:
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
340 return list(iterable)
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
341 return JSONEncoder.default(self, o)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
342
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
343 """
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
344 raise TypeError(repr(o) + " is not JSON serializable")
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
345
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
346 def encode(self, o):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
347 """Return a JSON string representation of a Python data structure.
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
348
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
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diff changeset
349 >>> JSONEncoder().encode({"foo": ["bar", "baz"]})
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
350 '{"foo": ["bar", "baz"]}'
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Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
351
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
352 """
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
353 # This is for extremely simple cases and benchmarks.
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
354 if isinstance(o, basestring):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
355 if isinstance(o, str):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
356 _encoding = self.encoding
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
357 if (_encoding is not None
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
358 and not (_encoding == 'utf-8')):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
359 o = o.decode(_encoding)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
360 if self.ensure_ascii:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
361 return encode_basestring_ascii(o)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
362 else:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
363 return encode_basestring(o)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
364 # This doesn't pass the iterator directly to ''.join() because the
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
365 # exceptions aren't as detailed. The list call should be roughly
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
366 # equivalent to the PySequence_Fast that ''.join() would do.
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
367 chunks = list(self.iterencode(o))
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
368 return ''.join(chunks)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
369
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
370 def iterencode(self, o):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
371 """Encode the given object and yield each string representation as
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
372 available.
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
373
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
374 For example::
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
375
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
376 for chunk in JSONEncoder().iterencode(bigobject):
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
377 mysocket.write(chunk)
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
378
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
379 """
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
380 if self.check_circular:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
381 markers = {}
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
382 else:
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
383 markers = None
4ded35754cb7 Add the 'json' package. Code taken from simplejson 1.9 and contributed by Bob
Brett Cannon <bcannon@gmail.com>
parents:
diff changeset
384 return self._iterencode(o, markers)