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https://github.com/jart/cosmopolitan.git
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a6baba1b07
The WIN32 CreateProcess() function does not require an .exe or .com suffix in order to spawn an executable. Now that we have Cosmo bash we're no longer so dependent on the cmd.exe prompt.
75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
"""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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if __name__ == 'PYOBJ':
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import _json
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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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