def load(self, source):
"""
读取json格式数据，source为json字符串。若遇到json格式错误，抛出异常。
"""
start = Tool.escape_whitespace(source, 0)
obj, end = self._decode(source, start)
end = Tool.escape_whitespace(source, end)
if end != len(source):
raise ValueError(Tool.errmsg("Extra data", source, end, len(source)))
return obj
def _decode_list(self, string, index):
values = []
nextchar = string[index:index + 1]
if nextchar in Tool.WhiteSpace:
index = Tool.escape_whitespace(string, index + 1)
nextchar = string[index:index + 1]
if nextchar == ']':
return values, index + 1
while True:
try:
value, index = self._decode(string, index)
except StopIteration:
raise ValueError(Tool.errmsg("Expecting object", string, index))
values.append(value)
nextchar = string[index:index + 1]
if nextchar in Tool.WhiteSpace:
index = Tool.escape_whitespace(string, index + 1)
nextchar = string[index:index + 1]
index += 1
if nextchar == ']':
break
elif nextchar != ',':
raise ValueError(Tool.errmsg("Expecting , delimiter", string, index))
try:
if string[index] in Tool.WhiteSpace:
index += 1
if string[index] in Tool.WhiteSpace:
index = Tool.escape_whitespace(string, index + 1)
except IndexError:
pass
return values, index
def _decode_float_int(self, string, index):
integer = ''
frac = ''
exp = ''
isInt = True
isFrac = False
isExp = False
while True:
if len(string) == index:
break
nextchar = string[index]
if nextchar in Tool.WhiteSpace:
index = Tool.escape_whitespace(string, index)
elif nextchar == '-' or nextchar == '+' or ('0' <= nextchar <= '9'):
if isInt:
integer += nextchar
index += 1
elif isFrac and not isExp:
frac += nextchar
index += 1
elif isExp:
exp += nextchar
index += 1
elif nextchar == '.':
isInt = False
isFrac = True
frac += nextchar
index += 1
elif nextchar == 'e' or nextchar == 'E':
isExp = True
exp += nextchar
index += 1
else:
break
if isFrac:
res = float(integer + frac + exp)
else:
res = int(integer)
return res, index
def _decode_dict(self, string, index):
values = []
nextchar = string[index:index + 1]
if nextchar != '"':
if nextchar in Tool.WhiteSpace:
index = Tool.escape_whitespace(string, index)
nextchar = string[index:index + 1]
if nextchar == '}':
values = {}
return values, index + 1
elif nextchar != '"':
raise ValueError(Tool.errmsg("Expecting property name", string, index))
index += 1
while True:
key, index = self._decode_string(string, index)
if string[index: index + 1] != ':':
index = Tool.escape_whitespace(string, index)
if string[index:index + 1] != ':':
raise ValueError(Tool.errmsg("Expecting : delimiter", string, index))
index += 1
try:
if string[index] in Tool.WhiteSpace:
index += 1
if string[index] in Tool.WhiteSpace:
index = Tool.escape_whitespace(string, index + 1)
except IndexError:
pass
try:
value, index = self._decode(string, index)
except StopIteration:
raise ValueError(Tool.errmsg("Expecting object", string, index))
values.append((key, value))
try:
nextchar = string[index]
if nextchar in Tool.WhiteSpace:
index = Tool.escape_whitespace(string, index)
nextchar = string[index]
except IndexError:
nextchar = ''
index += 1
if nextchar == '}':
break
elif nextchar != ',':
raise ValueError(Tool.errmsg("Expecting , delimiter", string, index))
try:
nextchar = string[index]
if nextchar in Tool.WhiteSpace:
index += 1
nextchar = string[index]
if nextchar in Tool.WhiteSpace:
index = Tool.escape_whitespace(string, index + 1)
nextchar = string[index]
except IndexError:
nextchar = ''
index += 1
if nextchar != '"':
raise ValueError(Tool.errmsg("Expecting property name", string, index))
values = dict(values)
return values, index
