130 lines
4.3 KiB
Python
130 lines
4.3 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# IMPORTS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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from __future__ import annotations;
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# install: lark; lark-parser; lark-parser[regex].
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# https://lark-parser.readthedocs.io/en/latest/grammar.html
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from lark import Lark;
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from lark import Tree;
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from typing import List;
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from typing import Union;
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# GLOBALE KONSTANTEN
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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## lexer
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with open('aussagenlogik/grammar.lark', 'r') as fp:
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grammar = ''.join(fp.readlines());
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lexerAussagenlogik = Lark(grammar, start='expr', regex=True);
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# KLASSE: Syntaxbaum
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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class SyntaxBaum(object):
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expr: str;
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kind: str;
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children: List[SyntaxBaum];
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tree: Tree;
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def __init__(self, fml: Tree):
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self.kind = fml.data;
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if len(fml.children) == 1 and isinstance(fml.children[0], str):
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self.expr = fml.children[0];
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self.children = [];
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self.tree = Tree(self.kind, fml.children);
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else:
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self.children = [ SyntaxBaum(child) for child in fml.children if isinstance(child, Tree) and child.data != 'symb' ];
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self.tree = Tree(self.kind, [child.tree for child in self.children]);
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signature_parts = [];
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i = 0;
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for teilfml in fml.children:
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if isinstance(teilfml, str):
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signature_parts.append(teilfml);
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elif teilfml.data == 'symb':
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signature_parts.append(getText(teilfml));
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else:
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signature_parts.append('{{{}}}'.format(i));
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i += 1;
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signature = ' '.join(signature_parts);
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self.expr = signature.format(*self.children);
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if self.kind in [ 'konj', 'konj_lang', 'disj', 'disj_lang', 'impl' ]:
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self.expr = ('(' if self.expr.startswith('(') else '( ') + self.expr;
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self.expr += (')' if self.expr.endswith(')') else ' )');
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return;
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def __str__(self):
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return self.expr;
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def pretty(self):
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return self.tree.pretty(indent_str='- ');
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# METHODE: string -> Syntaxbaum
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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def stringToSyntaxbaum(u: str) -> SyntaxBaum:
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try:
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return SyntaxBaum(lexerAussagenlogik.parse(u));
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except:
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raise Exception('Ausdruck \033[1m{}\033[0m konnte nicht erkannt werden!'.format(u));
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# METHODEN: Erkennung von Formeltypen
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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def isAtom(fml: SyntaxBaum) -> bool:
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return fml.kind == 'atom';
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def isBeliebig(fml: SyntaxBaum) -> bool:
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return fml.kind == 'beliebig';
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def isTrueSymbol(fml: SyntaxBaum) -> bool:
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return fml.kind == 'taut';
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def isFalseSymbol(fml: SyntaxBaum) -> bool:
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return fml.kind == 'kontr';
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def isNegation(fml: SyntaxBaum) -> bool:
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return fml.kind == 'neg';
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def isConjunction(fml: SyntaxBaum) -> bool:
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return fml.kind == 'konj';
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def isLongConjunction(fml: SyntaxBaum) -> bool:
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return fml.kind == 'konj_lang';
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def isDisjunction(fml: SyntaxBaum) -> bool:
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return fml.kind == 'disj';
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def isLongDisjunction(fml: SyntaxBaum) -> bool:
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return fml.kind == 'disj_lang';
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def isImplication(fml: SyntaxBaum) -> bool:
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return fml.kind == 'impl';
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# METHODEN: Formel -> Textinhalt
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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def getText(fml: Tree) -> str:
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text = fml.children[0];
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if isinstance(text, str):
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return text;
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raise Exception('Konnte Textinhalt nicht ablesen!');
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def getName(fml: SyntaxBaum) -> str:
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return fml.expr;
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# METHODEN: Formel -> Textinhalt
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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def prettifyTree(fml: Union[Tree, SyntaxBaum]) -> str:
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return fml.pretty();
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