def __error(self, error_message, position=None):
"""Report an error at the character just consumed."""
if position is None:
position = max(0, self.__scanner.position - 1)
raise JsonParseException(
error_message, position,
self.__scanner.line_number_for_offset(
position - self.__scanner.position))
def parse_value(self):
"""Parses a Json value from the input."""
start_pos = self.__scanner.position
try:
c = self.__peek_next_non_whitespace()
if c == "{":
return self.__parse_object()
elif c == "[":
return self.__parse_array()
elif c == '"':
if self.__check_repeated_chars('"', offset=1, count=2):
return self.__parse_triple_quoted_string()
else:
return self.__parse_string_with_concatenation()
elif c == "t":
self.__match("true", "unknown identifier")
return True
elif c == "f":
self.__match("false", "unknown identifier")
return False
elif c == "n":
self.__match("null", "unknown identifier")
return None
# end of the text or empty input.
elif c is None:
if start_pos == 0:
return self.__error("Empty input")
else:
return self.__error("Unexpected end-of-text")
# this must be after None check because we can not compare with None in python3
elif c == "-" or "0" <= c <= "9":
return self.__parse_number()
elif c == "}":
return self.__error("'}' can only be used to end an object")
elif c == "`":
return self.__error(
"Json_lib parser does not support length prefixed strings any more."
)
else:
return self.__error("Unexpected character '%s'" % c)
except IndexError:
raise JsonParseException(
"Parser unexpectantly reached end of input probably due to "
"an terminated string, object, or array",
start_pos,
self.__scanner.line_number_for_offset(start_pos),
)
def parse_value(self):
"""Parses a Json value from the input."""
start_pos = self.__scanner.position
try:
c = self.__peek_next_non_whitespace()
if c == '{':
return self.__parse_object()
elif c == '[':
return self.__parse_array()
elif c == '"':
if self.__check_repeated_chars('"', offset=1, count=2):
return self.__parse_triple_quoted_string()
else:
return self.__parse_string_with_concatenation()
elif c == 't':
self.__match("true", "unknown identifier")
return True
elif c == 'f':
self.__match("false", "unknown identifier")
return False
elif c == 'n':
self.__match("null", "unknown identifier")
return None
elif c == '-' or '0' <= c <= '9':
return self.__parse_number()
elif c == '}':
return self.__error("'}' can only be used to end an object")
elif c == '`':
return self.__parse_length_prefixed_string()
else:
if c is None:
if start_pos == 0:
return self.__error("Empty input")
else:
return self.__error("Unexpected end-of-text")
else:
return self.__error("Unexpected character '%s'" % c)
except IndexError:
raise JsonParseException(
"Parser unexpectantly reached end of input probably due to "
"an terminated string, object, or array", start_pos,
self.__scanner.line_number_for_offset(start_pos))