def init_parser():
"""Set up the parser with the grammar to be recognized.
"""
# CORE
digit = h.ch_range(0x30, 0x39)
alpha = h.choice(h.ch_range(0x41, 0x5a), h.ch_range(0x61, 0x7a))
space = h.in_(b" \t\n\r\f\v")
# AUX.
plus = h.ch(b'+')
slash = h.ch(b'/')
equals = h.ch(b'=')
bsfdig = h.choice(alpha, digit, plus, slash)
bsfdig_4bit = h.in_(b"AEIMQUYcgkosw048")
bsfdig_2bit = h.in_(b"AQgw")
base64_3 = h.repeat_n(bsfdig, 4)
base64_2 = h.sequence(bsfdig, bsfdig, bsfdig_4bit, equals)
base64_1 = h.sequence(bsfdig, bsfdig_2bit, equals, equals)
base64 = h.action(
h.sequence(h.many(base64_3), h.optional(h.choice(base64_2, base64_1))),
act_base64)
# TODO This is not quite the same as the C example, with uses act_ignore.
# But I can't get hammer to filter any value returned by act_ignore.
ws = h.ignore(h.many(space))
document = h.action(h.sequence(ws, base64, ws, h.end_p()), act_document)
# BUG sometimes inputs that should just don't parse.
# It *seemed* to happen mostly with things like "bbbbaaaaBA==".
# Using less actions seemed to make it less likely.
return document
def init_parser():
"""Set up the parser with the grammar to be recognized.
"""
# CORE
digit = h.ch_range(0x30, 0x39)
alpha = h.choice(h.ch_range(0x41, 0x5a), h.ch_range(0x61, 0x7a))
space = h.in_(" \t\n\r\f\v")
# AUX.
plus = h.ch('+')
slash = h.ch('/')
equals = h.ch('=')
bsfdig = h.choice(alpha, digit, plus, slash)
bsfdig_4bit = h.in_("AEIMQUYcgkosw048")
bsfdig_2bit = h.in_("AQgw")
base64_3 = h.repeat_n(bsfdig, 4)
base64_2 = h.sequence(bsfdig, bsfdig, bsfdig_4bit, equals)
base64_1 = h.sequence(bsfdig, bsfdig_2bit, equals, equals)
base64 = h.action(h.sequence(h.many(base64_3),
h.optional(h.choice(base64_2,
base64_1))),
act_base64)
# TODO This is not quite the same as the C example, with uses act_ignore.
# But I can't get hammer to filter any value returned by act_ignore.
ws = h.ignore(h.many(space))
document = h.action(h.sequence(ws, base64, ws, h.end_p()),
act_document)
# BUG sometimes inputs that should just don't parse.
# It *seemed* to happen mostly with things like "bbbbaaaaBA==".
# Using less actions seemed to make it less likely.
return document
def init_parser():
"""Return a parser with the grammar to be recognized.
"""
# CORE
# This is a direct translation of the C example. In C the literal 0x30
# is interchangable with the char literal '0' (note the single quotes).
# This is not the case in Python.
# TODO In the interests of being more Pythonic settle on either string
# literals, or integers
digit = h.ch_range(0x30, 0x39)
alpha = h.choice(h.ch_range(0x41, 0x5a), h.ch_range(0x61, 0x7a))
space = h.in_(" \t\n\r\f\v")
# AUX.
plus = h.ch('+')
slash = h.ch('/')
equals = h.action(h.ch('='), act_equals)
bsfdig = h.action(h.choice(alpha, digit, plus, slash), act_bsfdig)
bsfdig_4bit = h.action(h.in_("AEIMQUYcgkosw048"), act_bsfdig_4bit)
bsfdig_2bit = h.action(h.in_("AQgw"), act_bsfdig_2bit)
base64_3 = h.action(h.repeat_n(bsfdig, 4), act_base64_3)
base64_2 = h.action(h.sequence(bsfdig, bsfdig, bsfdig_4bit, equals),
act_base64_2)
base64_1 = h.action(h.sequence(bsfdig, bsfdig_2bit, equals, equals),
act_base64_1)
base64 = h.action(h.sequence(h.many(base64_3),
h.optional(h.choice(base64_2,
base64_1))),
act_base64)
# TODO This is not quite the same as the C example, with uses act_ignore.
# But I can't get hammer to filter any value returned by act_ignore.
ws = h.ignore(h.many(space))
document = h.action(h.sequence(ws, base64, ws, h.end_p()),
act_document)
# BUG sometimes inputs that should just don't parse.
# It *seemed* to happen mostly with things like "bbbbaaaaBA==".
# Using less actions seemed to make it less likely.
return document
def setUpClass(cls):
cls.parser = h.sequence(h.ch("a"), h.ignore(h.ch("b")), h.ch("c"))
def setUpClass(cls):
cls.parser = h.sequence(h.ch(b"a"), h.ignore(h.ch(b"b")), h.ch(b"c"))