"""JSON token scanner

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"""

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import re

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try:

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from _json import make_scanner as c_make_scanner

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except ImportError:

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c_make_scanner = None

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__all__ = ['make_scanner']

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NUMBER_RE = re.compile(

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

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

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def py_make_scanner(context):

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parse_object = context.parse_object

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parse_array = context.parse_array

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parse_string = context.parse_string

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match_number = NUMBER_RE.match

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strict = context.strict

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parse_float = context.parse_float

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parse_int = context.parse_int

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parse_constant = context.parse_constant

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object_hook = context.object_hook

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object_pairs_hook = context.object_pairs_hook

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memo = context.memo

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def _scan_once(string, idx):

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try:

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nextchar = string[idx]

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except IndexError:

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raise StopIteration(idx)

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if nextchar == '"':

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return parse_string(string, idx + 1, strict)

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elif nextchar == '{':

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

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_scan_once, object_hook, object_pairs_hook, memo)

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elif nextchar == '[':

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

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

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return None, idx + 4

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

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return True, idx + 4

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

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return False, idx + 5

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m = match_number(string, idx)

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if m is not None:

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integer, frac, exp = m.groups()

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if frac or exp:

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

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else:

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res = parse_int(integer)

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return res, m.end()

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

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return parse_constant('NaN'), idx + 3

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

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return parse_constant('Infinity'), idx + 8

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

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

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else:

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raise StopIteration(idx)

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def scan_once(string, idx):

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try:

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return _scan_once(string, idx)

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finally:

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memo.clear()

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return scan_once

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make_scanner = c_make_scanner or py_make_scanner

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