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master > master: grammatik auslagern

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RD
2021-05-07 06:37:32 +02:00
parent 92c1aa4d61
commit ff8b7132f0
3 changed files with 44 additions and 38 deletions
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44
code/aussagenlogik/schema.py
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@@ -18,42 +18,9 @@ from typing import Union;
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
## lexer
lexerAussagenlogik = Lark(
'''
%import common.WS
%import common.NUMBER
%import common.WORD
%ignore WS
?start: expr | open
?expr: atomic | not | closed
?open: and | and_long | or | or_long | impl
?closed: "(" open ")"
// atomische Ausdrücke
?atomic: false | true | atom | generic
?false: "0" -> kontr
?true: "1" -> taut
?atom: /A[0-9]+/ -> atom
?generic: "{" /((?!({|})).)+/ "}" -> beliebig
// Symbole
?symb_not: /!/ -> symb
?symb_and: /&+/ -> symb
?symb_or: /\\|+/ -> symb
?symb_impl: /->|=>/ -> symb
// Junktoren
?not: symb_not expr -> neg
?and: expr symb_and expr -> konj
?and_long: [ expr ( symb_and expr )+ ] -> konj_lang
?or: expr symb_or expr -> disj
?or_long: [ expr ( symb_or expr )+ ] -> disj_lang
?impl: expr symb_impl expr -> impl
''',
regex=True
);
with open('aussagenlogik/grammar.lark', 'r') as fp:
grammar = ''.join(fp.readlines());
lexerAussagenlogik = Lark(grammar, start='expr', regex=True);
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# KLASSE: Syntaxbaum
@@ -87,14 +54,15 @@ class SyntaxBaum(object):
signature = ' '.join(signature_parts);
self.expr = signature.format(*self.children);
if self.kind in [ 'konj', 'konj_lang', 'disj', 'disj_lang', 'impl' ]:
self.expr = '( {} )'.format(self.expr);
self.expr = ('(' if self.expr.startswith('(') else '( ') + self.expr;
self.expr += (')' if self.expr.endswith(')') else ' )');
return;
def __str__(self):
return self.expr;
def pretty(self):
return self.tree.pretty();
return self.tree.pretty(indent_str='- ');
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# METHODE: string -> Syntaxbaum