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abnf2parglare.py
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abnf2parglare.py
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import parglare
import sys
from tools import timeit
from dhall.parglare_adapter import to_parglare_grammar
from grammar_desugaring import (
StringTerminal, RangeTerminal, Name,
Sequence, Alternative, Optional, RangeRepetition, ExactRepetition,
Grammar,
)
abnf_grammar, start_symbol = to_parglare_grammar(
{
'start': [['_?', 'rules', '_?']],
'rules': [['rules', '_', 'rule'], ['rule']],
'rule': [['identifier', '_?', '=', '_?', 'definition0']],
'definition0': [
['definition0', '_?', '/', '_?', 'definition1'],
['definition1'],
],
'definition1': [
['definition1', '_', 'definition2'],
['definition2'],
],
'definition2': [
['dec', 'definition3'],
['dec?', '*', 'dec?', 'definition3'],
['definition3'],
],
'definition3': [
['(', '_?', 'definition0', '_?', ')'],
['[', '_?', 'definition0', '_?', ']'],
['%x', 'hex', '-', 'hex'],
['%d', 'dec', '-', 'dec'],
['string'],
['identifier'],
],
'hex_string': [['hex_string', 'dot', 'hex'], ['hex']],
'dec_string': [['dec_string', 'dot', 'dec'], ['dec']],
'string': [
['%x', 'hex_string'],
['%d', 'dec_string'],
['"', 'quoted_string', '"'],
],
'_?': [['_'], []],
'dec?': [['dec'], []],
},
{
'*': ('string', '*'),
'-': ('string', '-'),
'_': ('regexp', r'([ \r\n\t]|;[^\r\n]*\r\n)+'),
'=': ('string', '='),
'"': ('string', '"'),
'(': ('string', '('),
')': ('string', ')'),
'/': ('string', '/'),
'[': ('string', '['),
']': ('string', ']'),
'%d': ('string', r'%d'),
'dec': ('regexp', r'0|([1-9][0-9]*)'),
'dot': ('string', '.'),
'hex': ('regexp', r'[0-9A-Fa-f]+'),
'identifier': ('regexp', r'[a-zA-Z][0-9a-zA-Z\-_]*'),
'quoted_string': ('regexp', r'[^"]*'),
'%x': ('string', r'%x'),
},
'start',
)
def default(v, default):
if v is None:
return default
else:
return v
def take(constructor, indexes):
def f(_, c):
return constructor(*(c[i] for i in indexes))
return f
def take_raw(i):
def f(_, c):
return c[i]
return f
concat_0_2_actions = [
lambda _, c: c[0] + [c[2]],
lambda _, c: c,
]
with timeit('making grammar parser'):
abnf_parser = parglare.GLRParser(
abnf_grammar,
start_production=start_symbol,
ws='',
actions={
'dec?': parglare.actions.optional,
'hex?': parglare.actions.optional,
'hex': lambda _, v: int(v, 16),
'dec': lambda _, v: int(v, 10),
'hex_string': concat_0_2_actions,
'dec_string': concat_0_2_actions,
'string': [
lambda _, c: ''.join(map(chr, c[1])),
lambda _, c: ''.join(map(chr, c[1])),
take_raw(1),
],
'definition0': [
lambda _, c: Alternative((c[0], c[4])),
take_raw(0),
],
'definition1': [
lambda _, c: Sequence((c[0], c[2])),
take_raw(0),
],
'definition2': [
lambda _, c: ExactRepetition(c[0], c[1]),
lambda _, c: RangeRepetition(c[3], c[0], c[2]),
take_raw(0),
],
'definition3': [
take_raw(2),
take(Optional, [2]),
take(RangeTerminal, [1, 3]),
take(RangeTerminal, [1, 3]),
take(StringTerminal, [0]),
take(Name, [0]),
],
'rule': lambda _, c: (c[0], c[4]),
'rules': concat_0_2_actions,
'start': lambda _, c: Grammar(dict(c[1])),
'__start': take_raw(0),
},
)
if __name__ == '__main__':
from pprint import pprint
with timeit('parsing the grammar'):
trees = abnf_parser.parse(sys.stdin.read())
assert len(trees) == 1
tree = trees[0]
productions, terminals = tree.to_productions_dict()
print('grammar = ', end='')
pprint((productions, terminals))