Mercurial > cpython-lru_cache-weakref

annotate Lib/json/decoder.py @ 48715:48dddfd2fbf3

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RPC_WSTR is not available Visual Studio 2003 or earlier. (Maybe I should have defined RPC_WSTR on old compiler, but uuidcreate() is only place using it, so I simply replaced with unsigned short *)
author Hirokazu Yamamoto <ocean-city@m2.ccsnet.ne.jp>
date Sun, 17 Aug 2008 07:26:26 +0000
parents 9f45979558a9
children 83b2d07b475b
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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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19
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20 def linecol(doc, pos):
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21 lineno = doc.count('\n', 0, pos) + 1
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22 if lineno == 1:
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23 colno = pos
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24 else:
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25 colno = pos - doc.rindex('\n', 0, pos)
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26 return lineno, colno
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27
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28
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29 def errmsg(msg, doc, pos, end=None):
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30 lineno, colno = linecol(doc, pos)
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31 if end is None:
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32 fmt = '{0}: line {1} column {2} (char {3})'
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33 return fmt.format(msg, lineno, colno, pos)
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34 endlineno, endcolno = linecol(doc, end)
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35 fmt = '{0}: line {1} column {2} - line {3} column {4} (char {5} - {6})'
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36 return fmt.format(msg, lineno, colno, endlineno, endcolno, pos, end)
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37
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38
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39 _CONSTANTS = {
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40 '-Infinity': NegInf,
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41 'Infinity': PosInf,
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42 'NaN': NaN,
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43 'true': True,
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44 'false': False,
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45 'null': None,
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46 }
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47
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48
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49 def JSONConstant(match, context, c=_CONSTANTS):
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50 s = match.group(0)
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51 fn = getattr(context, 'parse_constant', None)
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52 if fn is None:
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53 rval = c[s]
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54 else:
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55 rval = fn(s)
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56 return rval, None
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57 pattern('(-?Infinity|NaN|true|false|null)')(JSONConstant)
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58
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59
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60 def JSONNumber(match, context):
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61 match = JSONNumber.regex.match(match.string, *match.span())
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62 integer, frac, exp = match.groups()
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63 if frac or exp:
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64 fn = getattr(context, 'parse_float', None) or float
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65 res = fn(integer + (frac or '') + (exp or ''))
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66 else:
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67 fn = getattr(context, 'parse_int', None) or int
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68 res = fn(integer)
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69 return res, None
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70 pattern(r'(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?')(JSONNumber)
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71
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72
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73 STRINGCHUNK = re.compile(r'(.*?)(["\\\x00-\x1f])', FLAGS)
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74 BACKSLASH = {
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75 '"': '"', '\\': '\\', '/': '/',
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76 'b': '\b', 'f': '\f', 'n': '\n', 'r': '\r', 't': '\t',
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77 }
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78
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79 DEFAULT_ENCODING = "utf-8"
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80
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81
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82 def py_scanstring(s, end, encoding=None, strict=True, _b=BACKSLASH, _m=STRINGCHUNK.match):
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83 if encoding is None:
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84 encoding = DEFAULT_ENCODING
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85 chunks = []
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86 _append = chunks.append
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87 begin = end - 1
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88 while 1:
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89 chunk = _m(s, end)
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90 if chunk is None:
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91 raise ValueError(
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92 errmsg("Unterminated string starting at", s, begin))
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93 end = chunk.end()
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94 content, terminator = chunk.groups()
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95 if content:
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96 if not isinstance(content, str):
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97 content = str(content, encoding)
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98 _append(content)
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99 if terminator == '"':
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100 break
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101 elif terminator != '\\':
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102 if strict:
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103 msg = "Invalid control character {0!r} at".format(terminator)
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104 raise ValueError(errmsg(msg, s, end))
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105 else:
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106 _append(terminator)
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107 continue
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108 try:
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109 esc = s[end]
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110 except IndexError:
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111 raise ValueError(
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112 errmsg("Unterminated string starting at", s, begin))
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113 if esc != 'u':
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114 try:
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115 m = _b[esc]
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116 except KeyError:
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117 msg = "Invalid \\escape: {0!r}".format(esc)
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118 raise ValueError(errmsg(msg, s, end))
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119 end += 1
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120 else:
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121 esc = s[end + 1:end + 5]
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122 next_end = end + 5
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123 msg = "Invalid \\uXXXX escape"
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124 try:
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125 if len(esc) != 4:
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126 raise ValueError
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127 uni = int(esc, 16)
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128 if 0xd800 <= uni <= 0xdbff and sys.maxunicode > 65535:
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129 msg = "Invalid \\uXXXX\\uXXXX surrogate pair"
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130 if not s[end + 5:end + 7] == '\\u':
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131 raise ValueError
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132 esc2 = s[end + 7:end + 11]
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133 if len(esc2) != 4:
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134 raise ValueError
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135 uni2 = int(esc2, 16)
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136 uni = 0x10000 + (((uni - 0xd800) << 10) | (uni2 - 0xdc00))
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137 next_end += 6
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138 m = chr(uni)
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139 except ValueError:
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140 raise ValueError(errmsg(msg, s, end))
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141 end = next_end
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142 _append(m)
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143 return ''.join(chunks), end
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144
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145
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146 # Use speedup
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147 if c_scanstring is not None:
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148 scanstring = c_scanstring
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149 else:
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150 scanstring = py_scanstring
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151
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152 def JSONString(match, context):
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153 encoding = getattr(context, 'encoding', None)
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154 strict = getattr(context, 'strict', True)
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155 return scanstring(match.string, match.end(), encoding, strict)
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156 pattern(r'"')(JSONString)
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157
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158
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159 WHITESPACE = re.compile(r'\s*', FLAGS)
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160
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161
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162 def JSONObject(match, context, _w=WHITESPACE.match):
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163 pairs = {}
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164 s = match.string
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165 end = _w(s, match.end()).end()
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166 nextchar = s[end:end + 1]
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167 # Trivial empty object
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168 if nextchar == '}':
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169 return pairs, end + 1
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170 if nextchar != '"':
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171 raise ValueError(errmsg("Expecting property name", s, end))
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172 end += 1
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173 encoding = getattr(context, 'encoding', None)
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174 strict = getattr(context, 'strict', True)
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175 iterscan = JSONScanner.iterscan
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176 while True:
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177 key, end = scanstring(s, end, encoding, strict)
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178 end = _w(s, end).end()
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179 if s[end:end + 1] != ':':
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180 raise ValueError(errmsg("Expecting : delimiter", s, end))
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181 end = _w(s, end + 1).end()
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182 try:
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183 value, end = next(iterscan(s, idx=end, context=context))
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184 except StopIteration:
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185 raise ValueError(errmsg("Expecting object", s, end))
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186 pairs[key] = value
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187 end = _w(s, end).end()
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188 nextchar = s[end:end + 1]
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189 end += 1
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190 if nextchar == '}':
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191 break
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192 if nextchar != ',':
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193 raise ValueError(errmsg("Expecting , delimiter", s, end - 1))
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194 end = _w(s, end).end()
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195 nextchar = s[end:end + 1]
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196 end += 1
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197 if nextchar != '"':
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198 raise ValueError(errmsg("Expecting property name", s, end - 1))
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199 object_hook = getattr(context, 'object_hook', None)
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200 if object_hook is not None:
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201 pairs = object_hook(pairs)
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202 return pairs, end
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203 pattern(r'{')(JSONObject)
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204
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205
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206 def JSONArray(match, context, _w=WHITESPACE.match):
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207 values = []
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208 s = match.string
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209 end = _w(s, match.end()).end()
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210 # Look-ahead for trivial empty array
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211 nextchar = s[end:end + 1]
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212 if nextchar == ']':
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213 return values, end + 1
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214 iterscan = JSONScanner.iterscan
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215 while True:
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216 try:
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217 value, end = next(iterscan(s, idx=end, context=context))
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218 except StopIteration:
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219 raise ValueError(errmsg("Expecting object", s, end))
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220 values.append(value)
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221 end = _w(s, end).end()
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222 nextchar = s[end:end + 1]
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223 end += 1
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224 if nextchar == ']':
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225 break
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226 if nextchar != ',':
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227 raise ValueError(errmsg("Expecting , delimiter", s, end))
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228 end = _w(s, end).end()
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229 return values, end
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230 pattern(r'\[')(JSONArray)
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231
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232
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233 ANYTHING = [
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234 JSONObject,
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235 JSONArray,
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236 JSONString,
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237 JSONConstant,
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238 JSONNumber,
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239 ]
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240
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241 JSONScanner = Scanner(ANYTHING)
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242
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243
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244 class JSONDecoder(object):
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245 """Simple JSON <http://json.org> decoder
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246
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247 Performs the following translations in decoding by default:
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248
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249 +---------------+-------------------+
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250 | JSON | Python |
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251 +===============+===================+
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252 | object | dict |
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253 +---------------+-------------------+
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254 | array | list |
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255 +---------------+-------------------+
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256 | string | unicode |
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257 +---------------+-------------------+
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258 | number (int) | int, long |
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259 +---------------+-------------------+
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260 | number (real) | float |
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261 +---------------+-------------------+
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262 | true | True |
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263 +---------------+-------------------+
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264 | false | False |
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265 +---------------+-------------------+
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266 | null | None |
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267 +---------------+-------------------+
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268
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269 It also understands ``NaN``, ``Infinity``, and ``-Infinity`` as
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270 their corresponding ``float`` values, which is outside the JSON spec.
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271 """
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272
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273 _scanner = Scanner(ANYTHING)
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274 __all__ = ['__init__', 'decode', 'raw_decode']
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275
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276 def __init__(self, encoding=None, object_hook=None, parse_float=None,
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277 parse_int=None, parse_constant=None, strict=True):
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278 """``encoding`` determines the encoding used to interpret any ``str``
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279 objects decoded by this instance (utf-8 by default). It has no
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280 effect when decoding ``unicode`` objects.
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281
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282 Note that currently only encodings that are a superset of ASCII work,
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283 strings of other encodings should be passed in as ``unicode``.
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284
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285 ``object_hook``, if specified, will be called with the result of
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286 every JSON object decoded and its return value will be used in
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287 place of the given ``dict``. This can be used to provide custom
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288 deserializations (e.g. to support JSON-RPC class hinting).
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289
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290 ``parse_float``, if specified, will be called with the string
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291 of every JSON float to be decoded. By default this is equivalent to
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292 float(num_str). This can be used to use another datatype or parser
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293 for JSON floats (e.g. decimal.Decimal).
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294
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295 ``parse_int``, if specified, will be called with the string
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296 of every JSON int to be decoded. By default this is equivalent to
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297 int(num_str). This can be used to use another datatype or parser
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298 for JSON integers (e.g. float).
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299
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300 ``parse_constant``, if specified, will be called with one of the
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301 following strings: -Infinity, Infinity, NaN, null, true, false.
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302 This can be used to raise an exception if invalid JSON numbers
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303 are encountered.
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304
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305 """
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306 self.encoding = encoding
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307 self.object_hook = object_hook
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308 self.parse_float = parse_float
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309 self.parse_int = parse_int
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310 self.parse_constant = parse_constant
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311 self.strict = strict
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312
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313 def decode(self, s, _w=WHITESPACE.match):
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314 """
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315 Return the Python representation of ``s`` (a ``str`` or ``unicode``
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316 instance containing a JSON document)
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317
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318 """
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319 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
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320 end = _w(s, end).end()
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321 if end != len(s):
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322 raise ValueError(errmsg("Extra data", s, end, len(s)))
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323 return obj
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324
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325 def raw_decode(self, s, **kw):
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326 """Decode a JSON document from ``s`` (a ``str`` or ``unicode`` beginning
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327 with a JSON document) and return a 2-tuple of the Python
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328 representation and the index in ``s`` where the document ended.
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329
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330 This can be used to decode a JSON document from a string that may
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331 have extraneous data at the end.
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332
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333 """
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334 kw.setdefault('context', self)
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335 try:
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336 obj, end = next(self._scanner.iterscan(s, **kw))
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337 except StopIteration:
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338 raise ValueError("No JSON object could be decoded")
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339 return obj, end