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"""JSON token scanner

"""

import re

try:

from _json import make_scanner as c_make_scanner

except ImportError:

c_make_scanner = None

__all__ = ['make_scanner']

NUMBER_RE = re.compile(

r'(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?',

(re.VERBOSE | re.MULTILINE | re.DOTALL))

def py_make_scanner(context):

parse_object = context.parse_object

parse_array = context.parse_array

parse_string = context.parse_string

match_number = NUMBER_RE.match

strict = context.strict

parse_float = context.parse_float

parse_int = context.parse_int

parse_constant = context.parse_constant

object_hook = context.object_hook

object_pairs_hook = context.object_pairs_hook

memo = context.memo

def _scan_once(string, idx):

try:

nextchar = string[idx]

except IndexError:

raise StopIteration(idx) from None

if nextchar == '"':

return parse_string(string, idx + 1, strict)

elif nextchar == '{':

return parse_object((string, idx + 1), strict,

_scan_once, object_hook, object_pairs_hook, memo)

elif nextchar == '[':

return parse_array((string, idx + 1), _scan_once)

elif nextchar == 'n' and string[idx:idx + 4] == 'null':

return None, idx + 4

elif nextchar == 't' and string[idx:idx + 4] == 'true':

return True, idx + 4

elif nextchar == 'f' and string[idx:idx + 5] == 'false':

return False, idx + 5

m = match_number(string, idx)

if m is not None:

integer, frac, exp = m.groups()

if frac or exp:

res = parse_float(integer + (frac or '') + (exp or ''))

else:

res = parse_int(integer)

return res, m.end()

elif nextchar == 'N' and string[idx:idx + 3] == 'NaN':

return parse_constant('NaN'), idx + 3

elif nextchar == 'I' and string[idx:idx + 8] == 'Infinity':

return parse_constant('Infinity'), idx + 8

elif nextchar == '-' and string[idx:idx + 9] == '-Infinity':

return parse_constant('-Infinity'), idx + 9

else:

raise StopIteration(idx)

def scan_once(string, idx):

try:

return _scan_once(string, idx)

finally:

memo.clear()

return scan_once

make_scanner = c_make_scanner or py_make_scanner

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