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import json
def try_parse(json_string: str):
try:
return json.loads(json_string)
except json.JSONDecodeError:
return DirtyJson.parse_string(json_string)
def parse(json_string: str):
return DirtyJson.parse_string(json_string)
def stringify(obj, **kwargs):
return json.dumps(obj, ensure_ascii=False, **kwargs)
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
# Add bounds checking to prevent IndexError
if not json_string:
# Return None for empty strings
return None
self.index = self.get_start_pos(self.json_string)
# Ensure index is within bounds
if self.index >= len(self.json_string):
# If start position is beyond string length, return None
return None
self.current_char = self.json_string[self.index]
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:
if self.current_char.isspace():
self._advance()
elif (
self.current_char == "/" and self._peek(1) == "/"
): # Single-line comment
self._skip_single_line_comment()
elif (
self.current_char == "/" and self._peek(1) == "*"
): # Multi-line comment
self._skip_multi_line_comment()
else:
break
def _skip_single_line_comment(self):
while self.current_char is not None and self.current_char != "\n":
self._advance()
if self.current_char == "\n":
self._advance()
def _skip_multi_line_comment(self):
self._advance(2) # Skip /*
while self.current_char is not None:
if self.current_char == "*" and self._peek(1) == "/":
self._advance(2) # Skip */
break
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 == "{":
if self._peek(1) == "{": # Handle {{
self._advance(2)
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:
# first char should match current char
if not self.current_char or self.current_char.lower() != text[0].lower():
return False
# peek remaining chars
remaining = len(text) - 1
if self._peek(remaining).lower() == text[1:].lower():
self._advance(len(text))
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 == "}":
if self._peek(1) == "}": # Handle }}
self._advance(2)
else:
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
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()
# handle trailing commas, end of array
self._skip_whitespace()
if self.current_char is None or self.current_char == "]":
if self.current_char == "]":
self._advance()
self.stack.pop()
return
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":
self._advance() # Skip 'u'
unicode_char = ""
# Try to collect exactly 4 hex digits
for _ in range(4):
if self.current_char is None or not self.current_char.isalnum():
# If we can't get 4 hex digits, treat it as a literal '\u' followed by whatever we got
return result + "\\u" + unicode_char
unicode_char += self.current_char
self._advance()
try:
result += chr(int(unicode_char, 16))
except ValueError:
# If invalid hex value, treat as literal
result += "\\u" + unicode_char
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_unquoted_string(self):
result = ""
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 + 1
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
def get_start_pos(self, input_str: str) -> int:
chars = ["{", "[", '"']
indices = [input_str.find(char) for char in chars if input_str.find(char) != -1]
return min(indices) if indices else 0
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