Mercurial > cpython-lru_cache-weakref

annotate Lib/json/decoder.py @ 51749:1408feec0084 3.0

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Merged revisions 69798 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r69798 | benjamin.peterson | 2009-02-19 22:02:38 -0600 (Thu, 19 Feb 2009) | 13 lines Merged revisions 69769,69776 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r69769 | georg.brandl | 2009-02-19 02:30:06 -0600 (Thu, 19 Feb 2009) | 1 line #5310, #3558: fix operator precedence table. ........ r69776 | georg.brandl | 2009-02-19 10:34:51 -0600 (Thu, 19 Feb 2009) | 2 lines #5317: update IronPython URL. ........ ................
author Benjamin Peterson <benjamin@python.org>
date Fri, 20 Feb 2009 04:05:32 +0000
parents 00e467db6182
children 93c929a2fac7
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1 """Implementation of JSONDecoder
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2 """
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3
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4 import re
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5 import sys
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6
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7 from json.scanner import Scanner, pattern
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8 try:
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9 from _json import scanstring as c_scanstring
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10 except ImportError:
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11 c_scanstring = None
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12
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13 __all__ = ['JSONDecoder']
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14
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15 FLAGS = re.VERBOSE | re.MULTILINE | re.DOTALL
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16
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17 NaN, PosInf, NegInf = float('nan'), float('inf'), float('-inf')
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18
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20 def linecol(doc, pos):
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21 if isinstance(doc, bytes):
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22 newline = b'\n'
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23 else:
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24 newline = '\n'
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25 lineno = doc.count(newline, 0, pos) + 1
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26 if lineno == 1:
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27 colno = pos
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28 else:
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29 colno = pos - doc.rindex(newline, 0, pos)
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30 return lineno, colno
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31
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33 def errmsg(msg, doc, pos, end=None):
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34 lineno, colno = linecol(doc, pos)
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35 if end is None:
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36 fmt = '{0}: line {1} column {2} (char {3})'
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37 return fmt.format(msg, lineno, colno, pos)
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38 endlineno, endcolno = linecol(doc, end)
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39 fmt = '{0}: line {1} column {2} - line {3} column {4} (char {5} - {6})'
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40 return fmt.format(msg, lineno, colno, endlineno, endcolno, pos, end)
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42
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43 _CONSTANTS = {
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44 '-Infinity': NegInf,
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45 'Infinity': PosInf,
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46 'NaN': NaN,
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47 'true': True,
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48 'false': False,
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49 'null': None,
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50 }
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51
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52
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53 def JSONConstant(match, context, c=_CONSTANTS):
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54 s = match.group(0)
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55 fn = getattr(context, 'parse_constant', None)
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56 if fn is None:
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57 rval = c[s]
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58 else:
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59 rval = fn(s)
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60 return rval, None
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61 pattern('(-?Infinity|NaN|true|false|null)')(JSONConstant)
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62
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63
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64 def JSONNumber(match, context):
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65 match = JSONNumber.regex.match(match.string, *match.span())
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66 integer, frac, exp = match.groups()
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67 if frac or exp:
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68 fn = getattr(context, 'parse_float', None) or float
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69 res = fn(integer + (frac or '') + (exp or ''))
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70 else:
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71 fn = getattr(context, 'parse_int', None) or int
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72 res = fn(integer)
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73 return res, None
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74 pattern(r'(-?(?:0|[1-9][0-9]*))(\.[0-9]+)?([eE][-+]?[0-9]+)?')(JSONNumber)
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75
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76
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77 STRINGCHUNK = re.compile(r'(.*?)(["\\\x00-\x1f])', FLAGS)
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78 BACKSLASH = {
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79 '"': '"', '\\': '\\', '/': '/',
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80 'b': '\b', 'f': '\f', 'n': '\n', 'r': '\r', 't': '\t',
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81 }
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82
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83 DEFAULT_ENCODING = "utf-8"
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84
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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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88 encoding = DEFAULT_ENCODING
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89 chunks = []
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90 _append = chunks.append
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91 begin = end - 1
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92 while 1:
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93 chunk = _m(s, end)
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94 if chunk is None:
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95 raise ValueError(
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96 errmsg("Unterminated string starting at", s, begin))
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97 end = chunk.end()
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98 content, terminator = chunk.groups()
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99 if content:
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100 if not isinstance(content, str):
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101 content = str(content, encoding)
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102 _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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106 if strict:
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107 msg = "Invalid control character {0!r} at".format(terminator)
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108 raise ValueError(errmsg(msg, s, end))
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109 else:
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110 _append(terminator)
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111 continue
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112 try:
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113 esc = s[end]
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114 except IndexError:
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115 raise ValueError(
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116 errmsg("Unterminated string starting at", s, begin))
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117 if esc != 'u':
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118 try:
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119 m = _b[esc]
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120 except KeyError:
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121 msg = "Invalid \\escape: {0!r}".format(esc)
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122 raise ValueError(errmsg(msg, s, end))
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123 end += 1
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124 else:
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125 esc = s[end + 1:end + 5]
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126 next_end = end + 5
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127 msg = "Invalid \\uXXXX escape"
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128 try:
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129 if len(esc) != 4:
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130 raise ValueError
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131 uni = int(esc, 16)
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132 if 0xd800 <= uni <= 0xdbff and sys.maxunicode > 65535:
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133 msg = "Invalid \\uXXXX\\uXXXX surrogate pair"
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134 if not s[end + 5:end + 7] == '\\u':
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135 raise ValueError
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136 esc2 = s[end + 7:end + 11]
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137 if len(esc2) != 4:
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138 raise ValueError
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139 uni2 = int(esc2, 16)
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140 uni = 0x10000 + (((uni - 0xd800) << 10) | (uni2 - 0xdc00))
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141 next_end += 6
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142 m = chr(uni)
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143 except ValueError:
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144 raise ValueError(errmsg(msg, s, end))
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145 end = next_end
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146 _append(m)
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147 return ''.join(chunks), end
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148
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149
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150 # Use speedup
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151 if c_scanstring is not None:
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152 scanstring = c_scanstring
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153 else:
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154 scanstring = py_scanstring
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155
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156 def JSONString(match, context):
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157 encoding = getattr(context, 'encoding', None)
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158 strict = getattr(context, 'strict', True)
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159 return scanstring(match.string, match.end(), encoding, strict)
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160 pattern(r'"')(JSONString)
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161
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162
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163 WHITESPACE = re.compile(r'\s*', FLAGS)
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164
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165
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166 def JSONObject(match, context, _w=WHITESPACE.match):
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167 pairs = {}
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168 s = match.string
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169 end = _w(s, match.end()).end()
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170 nextchar = s[end:end + 1]
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171 # Trivial empty object
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172 if nextchar == '}':
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173 return pairs, end + 1
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174 if nextchar != '"':
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175 raise ValueError(errmsg("Expecting property name", s, end))
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176 end += 1
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177 encoding = getattr(context, 'encoding', None)
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178 strict = getattr(context, 'strict', True)
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179 iterscan = JSONScanner.iterscan
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180 while True:
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181 key, end = scanstring(s, end, encoding, strict)
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182 end = _w(s, end).end()
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183 if s[end:end + 1] != ':':
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184 raise ValueError(errmsg("Expecting : delimiter", s, end))
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185 end = _w(s, end + 1).end()
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186 try:
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187 value, end = next(iterscan(s, idx=end, context=context))
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188 except StopIteration:
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189 raise ValueError(errmsg("Expecting object", s, end))
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190 pairs[key] = value
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191 end = _w(s, end).end()
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192 nextchar = s[end:end + 1]
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193 end += 1
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194 if nextchar == '}':
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195 break
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196 if nextchar != ',':
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197 raise ValueError(errmsg("Expecting , delimiter", s, end - 1))
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198 end = _w(s, end).end()
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199 nextchar = s[end:end + 1]
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200 end += 1
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201 if nextchar != '"':
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202 raise ValueError(errmsg("Expecting property name", s, end - 1))
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203 object_hook = getattr(context, 'object_hook', None)
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204 if object_hook is not None:
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205 pairs = object_hook(pairs)
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206 return pairs, end
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207 pattern(r'{')(JSONObject)
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208
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209
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210 def JSONArray(match, context, _w=WHITESPACE.match):
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211 values = []
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212 s = match.string
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213 end = _w(s, match.end()).end()
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214 # Look-ahead for trivial empty array
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215 nextchar = s[end:end + 1]
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216 if nextchar == ']':
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217 return values, end + 1
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218 iterscan = JSONScanner.iterscan
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219 while True:
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220 try:
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221 value, end = next(iterscan(s, idx=end, context=context))
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222 except StopIteration:
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223 raise ValueError(errmsg("Expecting object", s, end))
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224 values.append(value)
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225 end = _w(s, end).end()
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226 nextchar = s[end:end + 1]
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227 end += 1
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228 if nextchar == ']':
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229 break
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230 if nextchar != ',':
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231 raise ValueError(errmsg("Expecting , delimiter", s, end))
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232 end = _w(s, end).end()
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233 return values, end
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234 pattern(r'\[')(JSONArray)
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235
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236
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237 ANYTHING = [
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238 JSONObject,
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239 JSONArray,
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240 JSONString,
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241 JSONConstant,
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242 JSONNumber,
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243 ]
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244
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245 JSONScanner = Scanner(ANYTHING)
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246
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247
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248 class JSONDecoder(object):
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249 """Simple JSON <http://json.org> decoder
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250
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251 Performs the following translations in decoding by default:
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252
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253 +---------------+-------------------+
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254 | JSON | Python |
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255 +===============+===================+
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256 | object | dict |
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257 +---------------+-------------------+
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258 | array | list |
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259 +---------------+-------------------+
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260 | string | unicode |
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261 +---------------+-------------------+
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262 | number (int) | int, long |
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263 +---------------+-------------------+
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264 | number (real) | float |
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265 +---------------+-------------------+
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266 | true | True |
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267 +---------------+-------------------+
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268 | false | False |
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269 +---------------+-------------------+
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270 | null | None |
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271 +---------------+-------------------+
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272
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273 It also understands ``NaN``, ``Infinity``, and ``-Infinity`` as
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274 their corresponding ``float`` values, which is outside the JSON spec.
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275 """
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276
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277 _scanner = Scanner(ANYTHING)
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278 __all__ = ['__init__', 'decode', 'raw_decode']
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279
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280 def __init__(self, encoding=None, object_hook=None, parse_float=None,
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281 parse_int=None, parse_constant=None, strict=True):
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282 """``encoding`` determines the encoding used to interpret any ``str``
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283 objects decoded by this instance (utf-8 by default). It has no
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284 effect when decoding ``unicode`` objects.
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285
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286 Note that currently only encodings that are a superset of ASCII work,
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287 strings of other encodings should be passed in as ``unicode``.
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288
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289 ``object_hook``, if specified, will be called with the result of
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290 every JSON object decoded and its return value will be used in
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291 place of the given ``dict``. This can be used to provide custom
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292 deserializations (e.g. to support JSON-RPC class hinting).
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293
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294 ``parse_float``, if specified, will be called with the string
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295 of every JSON float to be decoded. By default this is equivalent to
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296 float(num_str). This can be used to use another datatype or parser
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297 for JSON floats (e.g. decimal.Decimal).
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298
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299 ``parse_int``, if specified, will be called with the string
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300 of every JSON int to be decoded. By default this is equivalent to
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301 int(num_str). This can be used to use another datatype or parser
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302 for JSON integers (e.g. float).
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303
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304 ``parse_constant``, if specified, will be called with one of the
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305 following strings: -Infinity, Infinity, NaN, null, true, false.
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306 This can be used to raise an exception if invalid JSON numbers
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307 are encountered.
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308
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309 """
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310 self.encoding = encoding
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311 self.object_hook = object_hook
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312 self.parse_float = parse_float
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313 self.parse_int = parse_int
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314 self.parse_constant = parse_constant
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315 self.strict = strict
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316
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317 def decode(self, s, _w=WHITESPACE.match):
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318 """
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319 Return the Python representation of ``s`` (a ``str`` or ``unicode``
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320 instance containing a JSON document)
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321
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322 """
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323 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
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324 end = _w(s, end).end()
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325 if end != len(s):
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326 raise ValueError(errmsg("Extra data", s, end, len(s)))
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327 return obj
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328
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329 def raw_decode(self, s, **kw):
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330 """Decode a JSON document from ``s`` (a ``str`` or ``unicode`` beginning
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331 with a JSON document) and return a 2-tuple of the Python
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332 representation and the index in ``s`` where the document ended.
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333
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334 This can be used to decode a JSON document from a string that may
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335 have extraneous data at the end.
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336
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337 """
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338 kw.setdefault('context', self)
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339 try:
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340 obj, end = next(self._scanner.iterscan(s, **kw))
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341 except StopIteration:
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342 raise ValueError("No JSON object could be decoded")
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343 return obj, end