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decoder.pyc
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Python Compiled Bytecode
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2011-03-24
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# Source Generated with Decompyle++
# File: in.pyc (Python 2.7)
'''Implementation of JSONDecoder
'''
import re
import sys
import struct
from json.scanner import make_scanner
try:
from _json import scanstring as c_scanstring
except ImportError:
c_scanstring = None
__all__ = [
'JSONDecoder']
FLAGS = re.VERBOSE | re.MULTILINE | re.DOTALL
def _floatconstants():
_BYTES = '7FF80000000000007FF0000000000000'.decode('hex')
if sys.byteorder != 'big':
_BYTES = _BYTES[:8][::-1] + _BYTES[8:][::-1]
(nan, inf) = struct.unpack('dd', _BYTES)
return (nan, inf, -inf)
(NaN, PosInf, NegInf) = _floatconstants()
def linecol(doc, pos):
lineno = doc.count('\n', 0, pos) + 1
if lineno == 1:
colno = pos
else:
colno = pos - doc.rindex('\n', 0, pos)
return (lineno, colno)
def errmsg(msg, doc, pos, end = None):
(lineno, colno) = linecol(doc, pos)
if end is None:
fmt = '{0}: line {1} column {2} (char {3})'
return fmt.format(msg, lineno, colno, pos)
(endlineno, endcolno) = None(doc, end)
fmt = '{0}: line {1} column {2} - line {3} column {4} (char {5} - {6})'
return fmt.format(msg, lineno, colno, endlineno, endcolno, pos, end)
_CONSTANTS = {
'-Infinity': NegInf,
'Infinity': PosInf,
'NaN': NaN }
STRINGCHUNK = re.compile('(.*?)(["\\\\\\x00-\\x1f])', FLAGS)
BACKSLASH = {
'"': u'"',
'\\': u'\\',
'/': u'/',
'b': u'\x08',
'f': u'\x0c',
'n': u'\n',
'r': u'\r',
't': u'\t' }
DEFAULT_ENCODING = 'utf-8'
def py_scanstring(s, end, encoding = None, strict = True, _b = BACKSLASH, _m = STRINGCHUNK.match):
'''Scan the string s for a JSON string. End is the index of the
character in s after the quote that started the JSON string.
Unescapes all valid JSON string escape sequences and raises ValueError
on attempt to decode an invalid string. If strict is False then literal
control characters are allowed in the string.
Returns a tuple of the decoded string and the index of the character in s
after the end quote.'''
if encoding is None:
encoding = DEFAULT_ENCODING
chunks = []
_append = chunks.append
begin = end - 1
while None:
chunk = _m(s, end)
if chunk is None:
raise ValueError(errmsg('Unterminated string starting at', s, begin))
end = chunk.end()
(content, terminator) = chunk.groups()
if content:
if not isinstance(content, unicode):
content = unicode(content, encoding)
_append(content)
if terminator == '"':
break
elif terminator != '\\':
if strict:
msg = 'Invalid control character {0!r} at'.format(terminator)
raise ValueError(errmsg(msg, s, end))
_append(terminator)
continue
try:
esc = s[end]
except IndexError:
raise ValueError(errmsg('Unterminated string starting at', s, begin))
if esc != 'u':
try:
char = _b[esc]
except KeyError:
msg = 'Invalid \\escape: ' + repr(esc)
raise ValueError(errmsg(msg, s, end))
end += 1
else:
esc = s[end + 1:end + 5]
next_end = end + 5
if len(esc) != 4:
msg = 'Invalid \\uXXXX escape'
raise ValueError(errmsg(msg, s, end))
uni = int(esc, 16)
if uni <= uni:
pass
elif uni <= 56319 and sys.maxunicode > 65535:
msg = 'Invalid \\uXXXX\\uXXXX surrogate pair'
if not s[end + 5:end + 7] == '\\u':
raise ValueError(errmsg(msg, s, end))
esc2 = s[end + 7:end + 11]
if len(esc2) != 4:
raise ValueError(errmsg(msg, s, end))
uni2 = int(esc2, 16)
uni = 65536 + (uni - 55296 << 10 | uni2 - 56320)
next_end += 6
char = unichr(uni)
end = next_end
continue
return (u''.join(chunks), end)
if not c_scanstring:
pass
scanstring = py_scanstring
WHITESPACE = re.compile('[ \\t\\n\\r]*', FLAGS)
WHITESPACE_STR = ' \t\n\r'
def JSONObject(s_and_end, encoding, strict, scan_once, object_hook, object_pairs_hook, _w = WHITESPACE.match, _ws = WHITESPACE_STR):
(s, end) = s_and_end
pairs = []
pairs_append = pairs.append
nextchar = s[end:end + 1]
if nextchar != '"':
if nextchar in _ws:
end = _w(s, end).end()
nextchar = s[end:end + 1]
if nextchar == '}':
return (pairs, end + 1)
if None != '"':
raise ValueError(errmsg('Expecting property name', s, end))
end += 1
while True:
(key, end) = scanstring(s, end, encoding, strict)
if s[end:end + 1] != ':':
end = _w(s, end).end()
if s[end:end + 1] != ':':
raise ValueError(errmsg('Expecting : delimiter', s, end))
end += 1
try:
if s[end] in _ws:
end += 1
if s[end] in _ws:
end = _w(s, end + 1).end()
except IndexError:
pass
try:
(value, end) = scan_once(s, end)
except StopIteration:
raise ValueError(errmsg('Expecting object', s, end))
pairs_append((key, value))
try:
nextchar = s[end]
if nextchar in _ws:
end = _w(s, end + 1).end()
nextchar = s[end]
except IndexError:
nextchar = ''
end += 1
if nextchar == '}':
break
elif nextchar != ',':
raise ValueError(errmsg('Expecting , delimiter', s, end - 1))
try:
nextchar = s[end]
if nextchar in _ws:
end += 1
nextchar = s[end]
if nextchar in _ws:
end = _w(s, end + 1).end()
nextchar = s[end]
except IndexError:
nextchar = ''
end += 1
if nextchar != '"':
raise ValueError(errmsg('Expecting property name', s, end - 1))
if object_pairs_hook is not None:
result = object_pairs_hook(pairs)
return (result, end)
pairs = None(pairs)
if object_hook is not None:
pairs = object_hook(pairs)
return (pairs, end)
def JSONArray(s_and_end, scan_once, _w = WHITESPACE.match, _ws = WHITESPACE_STR):
(s, end) = s_and_end
values = []
nextchar = s[end:end + 1]
if nextchar in _ws:
end = _w(s, end + 1).end()
nextchar = s[end:end + 1]
if nextchar == ']':
return (values, end + 1)
_append = None.append
while True:
try:
(value, end) = scan_once(s, end)
except StopIteration:
raise ValueError(errmsg('Expecting object', s, end))
_append(value)
nextchar = s[end:end + 1]
if nextchar in _ws:
end = _w(s, end + 1).end()
nextchar = s[end:end + 1]
end += 1
if nextchar == ']':
break
elif nextchar != ',':
raise ValueError(errmsg('Expecting , delimiter', s, end))
try:
if s[end] in _ws:
end += 1
if s[end] in _ws:
end = _w(s, end + 1).end()
continue
except IndexError:
continue
return (values, end)
class JSONDecoder(object):
'''Simple JSON <http://json.org> decoder
Performs the following translations in decoding by default:
+---------------+-------------------+
| JSON | Python |
+===============+===================+
| object | dict |
+---------------+-------------------+
| array | list |
+---------------+-------------------+
| string | unicode |
+---------------+-------------------+
| number (int) | int, long |
+---------------+-------------------+
| number (real) | float |
+---------------+-------------------+
| true | True |
+---------------+-------------------+
| false | False |
+---------------+-------------------+
| null | None |
+---------------+-------------------+
It also understands ``NaN``, ``Infinity``, and ``-Infinity`` as
their corresponding ``float`` values, which is outside the JSON spec.
'''
def __init__(self, encoding = None, object_hook = None, parse_float = None, parse_int = None, parse_constant = None, strict = True, object_pairs_hook = None):
"""``encoding`` determines the encoding used to interpret any ``str``
objects decoded by this instance (utf-8 by default). It has no
effect when decoding ``unicode`` objects.
Note that currently only encodings that are a superset of ASCII work,
strings of other encodings should be passed in as ``unicode``.
``object_hook``, if specified, will be called with the result
of every JSON object decoded and its return value will be used in
place of the given ``dict``. This can be used to provide custom
deserializations (e.g. to support JSON-RPC class hinting).
``object_pairs_hook``, if specified will be called with the result of
every JSON object decoded with an ordered list of pairs. The return
value of ``object_pairs_hook`` will be used instead of the ``dict``.
This feature can be used to implement custom decoders that rely on the
order that the key and value pairs are decoded (for example,
collections.OrderedDict will remember the order of insertion). If
``object_hook`` is also defined, the ``object_pairs_hook`` takes
priority.
``parse_float``, if specified, will be called with the string
of every JSON float to be decoded. By default this is equivalent to
float(num_str). This can be used to use another datatype or parser
for JSON floats (e.g. decimal.Decimal).
``parse_int``, if specified, will be called with the string
of every JSON int to be decoded. By default this is equivalent to
int(num_str). This can be used to use another datatype or parser
for JSON integers (e.g. float).
``parse_constant``, if specified, will be called with one of the
following strings: -Infinity, Infinity, NaN.
This can be used to raise an exception if invalid JSON numbers
are encountered.
If ``strict`` is false (true is the default), then control
characters will be allowed inside strings. Control characters in
this context are those with character codes in the 0-31 range,
including ``'\\t'`` (tab), ``'\\n'``, ``'\\r'`` and ``'\\0'``.
"""
self.encoding = encoding
self.object_hook = object_hook
self.object_pairs_hook = object_pairs_hook
if not parse_float:
pass
self.parse_float = float
if not parse_int:
pass
self.parse_int = int
if not parse_constant:
pass
self.parse_constant = _CONSTANTS.__getitem__
self.strict = strict
self.parse_object = JSONObject
self.parse_array = JSONArray
self.parse_string = scanstring
self.scan_once = make_scanner(self)
def decode(self, s, _w = WHITESPACE.match):
'''Return the Python representation of ``s`` (a ``str`` or ``unicode``
instance containing a JSON document)
'''
(obj, end) = self.raw_decode(s, idx = _w(s, 0).end())
end = _w(s, end).end()
if end != len(s):
raise ValueError(errmsg('Extra data', s, end, len(s)))
return obj
def raw_decode(self, s, idx = 0):
'''Decode a JSON document from ``s`` (a ``str`` or ``unicode``
beginning with a JSON document) and return a 2-tuple of the Python
representation and the index in ``s`` where the document ended.
This can be used to decode a JSON document from a string that may
have extraneous data at the end.
'''
try:
(obj, end) = self.scan_once(s, idx)
except StopIteration:
raise ValueError('No JSON object could be decoded')
return (obj, end)