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json_parser.py
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json_parser.py
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# -*- coding: utf-8 -*-
def log(*args):
print(*args)
def string_element(s):
r = '"'
ec = False
for i, e in enumerate(s[1:]):
r += e
if ec:
ec = False
continue
elif e == '\\':
ec = True
elif e == '"':
break
return r
def cut_blank(s):
r = s
start = True
end = True
blank_tokens = ' \n'
if len(r) == 0:
start = False
end = False
while start:
if r[0] in blank_tokens:
r = r[1:]
else:
start = False
while end:
if r[-1] in blank_tokens:
r = r[:-1]
else:
end = False
return r
def common_element(s):
r = ''
end_tokens = ']},:'
if s[0] == '"':
r = string_element(s)
return r
for i, e in enumerate(s):
if e in end_tokens:
r = s[:i]
r = cut_blank(r)
break
return r
def fomatted_element(s):
r = s
num = '-0123456789'
if r[0] in num:
if '.' in r:
return float(r)
else:
return int(r)
elif r[0] == '"':
r = r[1:-1]
return r
elif r == 'true':
return True
elif r == 'false':
return False
elif r == 'null':
return None
else:
return r
def tokenizer(s):
l = []
count = 0
tokens = '{}[],:'
blank_tokens = ' \n'
for i, e in enumerate(s):
if count > 0:
count -= 1
continue
elif e in blank_tokens:
continue
elif e in tokens:
l.append(e)
elif e == ' ':
pass
else:
token = common_element(s[i:])
count = len(token) - 1
token = fomatted_element(token)
l.append(token)
return l
def list_element(l):
r = []
count = 0
self_count = 0
for i, e in enumerate(l):
self_count += 1
if count > 0:
count -= 1
continue
if e == ']':
break
else:
token, child_count = parser(l[i:])
r.append(token)
count += child_count
if l[i + child_count + 1] == ',':
count += 1
return r, self_count
def dict_element(l):
r = {}
count = 0
self_count = 0
for i, e in enumerate(l):
self_count += 1
if count > 0:
count -= 1
continue
if e == '}':
break
else:
k = e
v, child_count = parser(l[i + 2:])
r[k] = v
count += child_count + 2
if l[i + count + 1] == ',':
count += 1
return r, self_count
def parser(l):
c = 0
if l[0] == '{':
r, child_count = dict_element(l[1:])
c = child_count
pass
elif l[0] == '[':
r, child_count = list_element(l[1:])
c = child_count
else:
r = l[0]
return r, c
def tree(s):
l = tokenizer(s)
r, c = parser(l)
return r
def t_common_element():
s1 = '''"employees": [
{ "firstName":"John" , "lastName":"Doe" },
{ "firstName":"Anna" , "lastName":"Smith" }
'''
s2 = '123 , "lastName":"Smith" }'
assert common_element(s1) == '"employees"', 'common_element 测试1 fail'
assert common_element(s2) == '123', 'common_element 测试2 fail'
def t_tree():
s1 = '''
{
"employees": [
{
"firstName": -12.34,
"lastName": null
},
{
"firstName": true,
"lastName": [
"Smith",
123
]
}
]
}
'''
# s1 = '''{"employees": [{ "firstName":-12.34 , "lastName":null }]}'''
log('字符串:', s1)
log('>>>')
log(tokenizer(s1))
log('>>>')
log('结果:', tree(s1))
s2 = '''
{
"achievement": [
"ach1",
"ach2",
"ach3"
],
"age": 23,
"name": "Tsybius",
"partner": {
"partner_age": 21,
"partner_name": "Galatea",
"partner_sex_is_male": false
},
"sex_is_male": true
}
'''
log('\n\n')
log('字符串:', s2)
log('>>>')
log(tokenizer(s2))
log('>>>')
log('结果:', tree(s2))
def t():
pass
t_common_element()
# t_tokenizer()
t_tree()
if __name__ == '__main__':
t()