many_to_one.py 文件源码

def _as_graph(self, finals: Optional[List[str]]) -> Digraph:  # pragma: no cover
        if Digraph is None:
            raise ImportError('The graphviz package is required to draw the graph.')
        graph = Digraph()
        if finals is None:
            patterns = [
                '{}: {} with {}'.format(
                    self._colored_pattern(i), html.escape(str(p.expression)), self._format_constraint_set(c)
                ) for i, (p, l, c) in enumerate(self.patterns)
            ]
            graph.node('patterns', '<<b>Patterns:</b><br/>\n{}>'.format('<br/>\n'.join(patterns)), {'shape': 'box'})

        self._make_graph_nodes(graph, finals)
        if finals is None:
            constraints = [
                '{}: {} for {}'.format(self._colored_constraint(i), html.escape(str(c)), self._format_pattern_set(p))
                for i, (c, p) in enumerate(self.constraints)
            ]
            graph.node(
                'constraints', '<<b>Constraints:</b><br/>\n{}>'.format('<br/>\n'.join(constraints)), {'shape': 'box'}
            )
        self._make_graph_edges(graph)
        return graph