author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 28 Feb 2009 12:10:19 +0000 | |
changeset 1554 | 163c879d1ffe |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Implementation of JSONDecoder |
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3 |
""" |
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import re |
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import sys |
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|
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from django.utils.simplejson.scanner import Scanner, pattern |
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try: |
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from django.utils.simplejson._speedups import scanstring as c_scanstring |
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except ImportError: |
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11 |
pass |
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|
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FLAGS = re.VERBOSE | re.MULTILINE | re.DOTALL |
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|
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15 |
def _floatconstants(): |
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import struct |
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import sys |
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_BYTES = '7FF80000000000007FF0000000000000'.decode('hex') |
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if sys.byteorder != 'big': |
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_BYTES = _BYTES[:8][::-1] + _BYTES[8:][::-1] |
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nan, inf = struct.unpack('dd', _BYTES) |
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return nan, inf, -inf |
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|
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NaN, PosInf, NegInf = _floatconstants() |
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def linecol(doc, pos): |
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lineno = doc.count('\n', 0, pos) + 1 |
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if lineno == 1: |
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colno = pos |
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else: |
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colno = pos - doc.rindex('\n', 0, pos) |
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return lineno, colno |
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def errmsg(msg, doc, pos, end=None): |
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lineno, colno = linecol(doc, pos) |
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if end is None: |
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return '%s: line %d column %d (char %d)' % (msg, lineno, colno, pos) |
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endlineno, endcolno = linecol(doc, end) |
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return '%s: line %d column %d - line %d column %d (char %d - %d)' % ( |
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msg, lineno, colno, endlineno, endcolno, pos, end) |
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_CONSTANTS = { |
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'-Infinity': NegInf, |
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'Infinity': PosInf, |
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'NaN': NaN, |
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'true': True, |
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'false': False, |
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'null': None, |
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} |
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def JSONConstant(match, context, c=_CONSTANTS): |
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s = match.group(0) |
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fn = getattr(context, 'parse_constant', None) |
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if fn is None: |
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rval = c[s] |
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else: |
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rval = fn(s) |
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return rval, None |
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pattern('(-?Infinity|NaN|true|false|null)')(JSONConstant) |
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64 |
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def JSONNumber(match, context): |
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match = JSONNumber.regex.match(match.string, *match.span()) |
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integer, frac, exp = match.groups() |
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if frac or exp: |
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fn = getattr(context, 'parse_float', None) or float |
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res = fn(integer + (frac or '') + (exp or '')) |
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else: |
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fn = getattr(context, 'parse_int', None) or int |
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res = fn(integer) |
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return res, None |
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pattern(r'(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?')(JSONNumber) |
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76 |
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STRINGCHUNK = re.compile(r'(.*?)(["\\\x00-\x1f])', FLAGS) |
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BACKSLASH = { |
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80 |
'"': u'"', '\\': u'\\', '/': u'/', |
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81 |
'b': u'\b', 'f': u'\f', 'n': u'\n', 'r': u'\r', 't': u'\t', |
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} |
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83 |
|
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84 |
DEFAULT_ENCODING = "utf-8" |
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85 |
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86 |
def py_scanstring(s, end, encoding=None, strict=True, _b=BACKSLASH, _m=STRINGCHUNK.match): |
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87 |
if encoding is None: |
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encoding = DEFAULT_ENCODING |
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89 |
chunks = [] |
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90 |
_append = chunks.append |
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begin = end - 1 |
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92 |
while 1: |
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chunk = _m(s, end) |
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if chunk is None: |
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95 |
raise ValueError( |
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errmsg("Unterminated string starting at", s, begin)) |
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end = chunk.end() |
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98 |
content, terminator = chunk.groups() |
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99 |
if content: |
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if not isinstance(content, unicode): |
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content = unicode(content, encoding) |
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_append(content) |
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103 |
if terminator == '"': |
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104 |
break |
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105 |
elif terminator != '\\': |
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if strict: |
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107 |
raise ValueError(errmsg("Invalid control character %r at", s, end)) |
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108 |
else: |
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109 |
_append(terminator) |
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110 |
continue |
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111 |
try: |
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|
112 |
esc = s[end] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
113 |
except IndexError: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
114 |
raise ValueError( |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
115 |
errmsg("Unterminated string starting at", s, begin)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
116 |
if esc != 'u': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
117 |
try: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
118 |
m = _b[esc] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
119 |
except KeyError: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
120 |
raise ValueError( |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
121 |
errmsg("Invalid \\escape: %r" % (esc,), s, end)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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changeset
|
122 |
end += 1 |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
123 |
else: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
124 |
esc = s[end + 1:end + 5] |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
125 |
next_end = end + 5 |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
126 |
msg = "Invalid \\uXXXX escape" |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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changeset
|
127 |
try: |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
54
diff
changeset
|
128 |
if len(esc) != 4: |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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changeset
|
129 |
raise ValueError |
323
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
130 |
uni = int(esc, 16) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
131 |
if 0xd800 <= uni <= 0xdbff and sys.maxunicode > 65535: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
132 |
msg = "Invalid \\uXXXX\\uXXXX surrogate pair" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
133 |
if not s[end + 5:end + 7] == '\\u': |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
134 |
raise ValueError |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
135 |
esc2 = s[end + 7:end + 11] |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
136 |
if len(esc2) != 4: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
137 |
raise ValueError |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
138 |
uni2 = int(esc2, 16) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
139 |
uni = 0x10000 + (((uni - 0xd800) << 10) | (uni2 - 0xdc00)) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
140 |
next_end += 6 |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
141 |
m = unichr(uni) |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
142 |
except ValueError: |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
143 |
raise ValueError(errmsg(msg, s, end)) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
144 |
end = next_end |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
145 |
_append(m) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
146 |
return u''.join(chunks), end |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
147 |
|
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
54
diff
changeset
|
148 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
149 |
# Use speedup |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
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parents:
54
diff
changeset
|
150 |
try: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
151 |
scanstring = c_scanstring |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
152 |
except NameError: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
153 |
scanstring = py_scanstring |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
154 |
|
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
155 |
def JSONString(match, context): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
156 |
encoding = getattr(context, 'encoding', None) |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
157 |
strict = getattr(context, 'strict', True) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
158 |
return scanstring(match.string, match.end(), encoding, strict) |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
159 |
pattern(r'"')(JSONString) |
03e267d67478
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parents:
diff
changeset
|
160 |
|
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
161 |
|
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
162 |
WHITESPACE = re.compile(r'\s*', FLAGS) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
163 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
164 |
def JSONObject(match, context, _w=WHITESPACE.match): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
165 |
pairs = {} |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
166 |
s = match.string |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
167 |
end = _w(s, match.end()).end() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
168 |
nextchar = s[end:end + 1] |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
169 |
# Trivial empty object |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
diff
changeset
|
170 |
if nextchar == '}': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
171 |
return pairs, end + 1 |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
172 |
if nextchar != '"': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
173 |
raise ValueError(errmsg("Expecting property name", s, end)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
174 |
end += 1 |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
175 |
encoding = getattr(context, 'encoding', None) |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
176 |
strict = getattr(context, 'strict', True) |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
177 |
iterscan = JSONScanner.iterscan |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
178 |
while True: |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
179 |
key, end = scanstring(s, end, encoding, strict) |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
180 |
end = _w(s, end).end() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
181 |
if s[end:end + 1] != ':': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
182 |
raise ValueError(errmsg("Expecting : delimiter", s, end)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
183 |
end = _w(s, end + 1).end() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
184 |
try: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
185 |
value, end = iterscan(s, idx=end, context=context).next() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
186 |
except StopIteration: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
187 |
raise ValueError(errmsg("Expecting object", s, end)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
188 |
pairs[key] = value |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
189 |
end = _w(s, end).end() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
190 |
nextchar = s[end:end + 1] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
191 |
end += 1 |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
192 |
if nextchar == '}': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
193 |
break |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
194 |
if nextchar != ',': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
195 |
raise ValueError(errmsg("Expecting , delimiter", s, end - 1)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
196 |
end = _w(s, end).end() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
197 |
nextchar = s[end:end + 1] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
198 |
end += 1 |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
199 |
if nextchar != '"': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
200 |
raise ValueError(errmsg("Expecting property name", s, end - 1)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
201 |
object_hook = getattr(context, 'object_hook', None) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
202 |
if object_hook is not None: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
203 |
pairs = object_hook(pairs) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
204 |
return pairs, end |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
205 |
pattern(r'{')(JSONObject) |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
206 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
207 |
|
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
208 |
def JSONArray(match, context, _w=WHITESPACE.match): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
209 |
values = [] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
210 |
s = match.string |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
211 |
end = _w(s, match.end()).end() |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
212 |
# Look-ahead for trivial empty array |
54
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
213 |
nextchar = s[end:end + 1] |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
214 |
if nextchar == ']': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
215 |
return values, end + 1 |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
216 |
iterscan = JSONScanner.iterscan |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
217 |
while True: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
218 |
try: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
219 |
value, end = iterscan(s, idx=end, context=context).next() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
220 |
except StopIteration: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
221 |
raise ValueError(errmsg("Expecting object", s, end)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
222 |
values.append(value) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
223 |
end = _w(s, end).end() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
224 |
nextchar = s[end:end + 1] |
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end += 1 |
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if nextchar == ']': |
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break |
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if nextchar != ',': |
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raise ValueError(errmsg("Expecting , delimiter", s, end)) |
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end = _w(s, end).end() |
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return values, end |
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pattern(r'\[')(JSONArray) |
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234 |
|
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ANYTHING = [ |
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JSONObject, |
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JSONArray, |
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JSONString, |
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JSONConstant, |
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JSONNumber, |
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241 |
] |
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242 |
|
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JSONScanner = Scanner(ANYTHING) |
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|
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class JSONDecoder(object): |
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""" |
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Simple JSON <http://json.org> decoder |
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Performs the following translations in decoding by default: |
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|
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+---------------+-------------------+ |
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| JSON | Python | |
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+===============+===================+ |
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| object | dict | |
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+---------------+-------------------+ |
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| array | list | |
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+---------------+-------------------+ |
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| string | unicode | |
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+---------------+-------------------+ |
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| number (int) | int, long | |
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+---------------+-------------------+ |
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| number (real) | float | |
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+---------------+-------------------+ |
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| true | True | |
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+---------------+-------------------+ |
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| false | False | |
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+---------------+-------------------+ |
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| null | None | |
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+---------------+-------------------+ |
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271 |
|
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It also understands ``NaN``, ``Infinity``, and ``-Infinity`` as |
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their corresponding ``float`` values, which is outside the JSON spec. |
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""" |
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_scanner = Scanner(ANYTHING) |
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__all__ = ['__init__', 'decode', 'raw_decode'] |
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def __init__(self, encoding=None, object_hook=None, parse_float=None, |
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parse_int=None, parse_constant=None, strict=True): |
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""" |
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``encoding`` determines the encoding used to interpret any ``str`` |
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objects decoded by this instance (utf-8 by default). It has no |
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effect when decoding ``unicode`` objects. |
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285 |
|
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Note that currently only encodings that are a superset of ASCII work, |
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strings of other encodings should be passed in as ``unicode``. |
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288 |
|
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``object_hook``, if specified, will be called with the result |
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of every JSON object decoded and its return value will be used in |
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place of the given ``dict``. This can be used to provide custom |
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deserializations (e.g. to support JSON-RPC class hinting). |
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293 |
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``parse_float``, if specified, will be called with the string |
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of every JSON float to be decoded. By default this is equivalent to |
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float(num_str). This can be used to use another datatype or parser |
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for JSON floats (e.g. decimal.Decimal). |
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298 |
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``parse_int``, if specified, will be called with the string |
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of every JSON int to be decoded. By default this is equivalent to |
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int(num_str). This can be used to use another datatype or parser |
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for JSON integers (e.g. float). |
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303 |
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``parse_constant``, if specified, will be called with one of the |
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following strings: -Infinity, Infinity, NaN, null, true, false. |
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This can be used to raise an exception if invalid JSON numbers |
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are encountered. |
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""" |
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self.encoding = encoding |
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self.object_hook = object_hook |
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self.parse_float = parse_float |
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self.parse_int = parse_int |
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self.parse_constant = parse_constant |
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self.strict = strict |
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315 |
|
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def decode(self, s, _w=WHITESPACE.match): |
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""" |
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Return the Python representation of ``s`` (a ``str`` or ``unicode`` |
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instance containing a JSON document) |
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""" |
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obj, end = self.raw_decode(s, idx=_w(s, 0).end()) |
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end = _w(s, end).end() |
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if end != len(s): |
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raise ValueError(errmsg("Extra data", s, end, len(s))) |
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return obj |
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326 |
|
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def raw_decode(self, s, **kw): |
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""" |
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Decode a JSON document from ``s`` (a ``str`` or ``unicode`` beginning |
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with a JSON document) and return a 2-tuple of the Python |
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representation and the index in ``s`` where the document ended. |
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332 |
|
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This can be used to decode a JSON document from a string that may |
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have extraneous data at the end. |
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""" |
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kw.setdefault('context', self) |
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try: |
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obj, end = self._scanner.iterscan(s, **kw).next() |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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|
339 |
except StopIteration: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
340 |
raise ValueError("No JSON object could be decoded") |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
341 |
return obj, end |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
342 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
343 |
__all__ = ['JSONDecoder'] |