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# work in progress, but quite good already
# able to parse json like this, even when cut in half:
# {
# name: John Doe,
# 'age': 30,
# 'some': undefined,
# other: tRue,
# city: "New York",
# "hobbies": ["reading", 'cycling'],
# married: false,
# children: null,
# "bio": """A multi-line
# biography that
# spans several lines""",
# 'quote': """Another
# multi-line quote
# using single quotes"""
# }
class DirtyJson:
def __init__(self):
self._reset()
def _reset(self):
self.json_string = ""
self.index = 0
self.current_char = None
self.result = None
self.stack = []
@staticmethod
def parse_string(json_string):
parser = DirtyJson()
return parser.parse(json_string)
def parse(self, json_string):
self._reset()
self.json_string = json_string
self.current_char = self.json_string[0]
self._parse()
return self.result
def feed(self, chunk):
self.json_string += chunk
if not self.current_char and self.json_string:
self.current_char = self.json_string[0]
self._parse()
return self.result
def _advance(self,count=1):
self.index += count
if self.index < len(self.json_string):
self.current_char = self.json_string[self.index]
else:
self.current_char = None
def _skip_whitespace(self):
while self.current_char is not None and self.current_char.isspace():
self._advance()
def _parse(self):
if self.result is None:
self.result = self._parse_value()
else:
self._continue_parsing()
def _continue_parsing(self):
while self.current_char is not None:
if isinstance(self.result, dict):
self._parse_object_content()
elif isinstance(self.result, list):
self._parse_array_content()
elif isinstance(self.result, str):
self.result = self._parse_string()
else:
break
def _parse_value(self):
self._skip_whitespace()
if self.current_char == '{':
return self._parse_object()
elif self.current_char == '[':
return self._parse_array()
elif self.current_char in ['"', "'", "`"]:
if self._peek(2) == self.current_char * 2: # type: ignore
return self._parse_multiline_string()
return self._parse_string()
elif self.current_char and (self.current_char.isdigit() or self.current_char in ['-', '+']):
return self._parse_number()
elif self._match("true"):
return True
elif self._match('false'):
return False
elif self._match('null') or self._match("undefined"):
return None
elif self.current_char:
return self._parse_unquoted_string()
return None
def _match(self, text:str) -> bool:
cnt = len(text)
if self._peek(cnt).lower() == text.lower():
self._advance(cnt)
return True
return False
def _parse_object(self):
obj = {}
self._advance() # Skip opening brace
self.stack.append(obj)
self._parse_object_content()
return obj
def _parse_object_content(self):
while self.current_char is not None:
self._skip_whitespace()
if self.current_char == '}':
self._advance()
self.stack.pop()
return
if self.current_char is None:
self.stack.pop()
return # End of input reached while parsing object
key = self._parse_key()
value = None
self._skip_whitespace()
if self.current_char == ':':
self._advance()
value = self._parse_value()
elif self.current_char is None:
value = None # End of input reached after key
else:
value = self._parse_value()
self.stack[-1][key] = value
self._skip_whitespace()
if self.current_char == ',':
self._advance()
continue
elif self.current_char != '}':
if self.current_char is None:
self.stack.pop()
return # End of input reached after value
# Allow missing comma between key-value pairs
continue
def _parse_key(self):
self._skip_whitespace()
if self.current_char in ['"', "'"]:
return self._parse_string()
else:
return self._parse_unquoted_key()
def _parse_unquoted_key(self):
result = ""
while self.current_char is not None and not self.current_char.isspace() and self.current_char not in [':', ',', '}', ']']:
result += self.current_char
self._advance()
return result
def _parse_array(self):
arr = []
self._advance() # Skip opening bracket
self.stack.append(arr)
self._parse_array_content()
return arr
def _parse_array_content(self):
while self.current_char is not None:
self._skip_whitespace()
if self.current_char == ']':
self._advance()
self.stack.pop()
return
value = self._parse_value()
self.stack[-1].append(value)
self._skip_whitespace()
if self.current_char == ',':
self._advance()
elif self.current_char != ']':
self.stack.pop()
return
def _parse_string(self):
result = ""
quote_char = self.current_char
self._advance() # Skip opening quote
while self.current_char is not None and self.current_char != quote_char:
if self.current_char == '\\':
self._advance()
if self.current_char in ['"', "'", '\\', '/', 'b', 'f', 'n', 'r', 't']:
result += {'b': '\b', 'f': '\f', 'n': '\n', 'r': '\r', 't': '\t'}.get(self.current_char, self.current_char)
elif self.current_char == 'u':
unicode_char = ""
for _ in range(4):
if self.current_char is None:
return result
unicode_char += self.current_char
self._advance()
result += chr(int(unicode_char, 16))
continue
else:
result += self.current_char
self._advance()
if self.current_char == quote_char:
self._advance() # Skip closing quote
return result
def _parse_multiline_string(self):
result = ""
quote_char = self.current_char
self._advance(3) # Skip first quote
while self.current_char is not None:
if self.current_char == quote_char and self._peek(2) == quote_char * 2: # type: ignore
self._advance(3) # Skip first quote
break
result += self.current_char
self._advance()
return result.strip()
def _parse_number(self):
number_str = ""
while self.current_char is not None and (self.current_char.isdigit() or self.current_char in ['-', '+', '.', 'e', 'E']):
number_str += self.current_char
self._advance()
try:
return int(number_str)
except ValueError:
return float(number_str)
def _parse_true(self):
self._advance()
for char in 'rue':
if self.current_char != char:
return None
self._advance()
return True
def _parse_false(self):
self._advance()
for char in 'alse':
if self.current_char != char:
return None
self._advance()
return False
def _parse_null(self):
self._advance()
for char in 'ull':
if self.current_char != char:
return None
self._advance()
return None
def _parse_unquoted_string(self):
result = ""
# while self.current_char is not None and not self.current_char.isspace() and self.current_char not in [':', ',', '}', ']']:
while self.current_char is not None and self.current_char not in [':', ',', '}', ']']:
result += self.current_char
self._advance()
self._advance()
return result.strip()
def _peek(self, n):
peek_index = self.index
result = ''
for _ in range(n):
if peek_index < len(self.json_string):
result += self.json_string[peek_index]
peek_index += 1
else:
break
return result |