pydotfactory.py

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from distutils.version import LooseVersion
try:
    from urllib.request import quote
except ImportError:
    from urllib import quote
 
import os
 
import pydot
 
 
# Reference implementation for a dotcode factory
class PydotFactory():
 
    def __init__(self):
        pass
 
    def escape_label(self, name):
        if name in ['graph', 'subgraph', 'node', 'edge']:
            ret = '%s_' % name
        else:
            ret = name
        return ret
 
    def escape_name(self, name):
        ret = quote(name.strip())
        ret = ret.replace('/', '__')
        ret = ret.replace('%', '_')
        ret = ret.replace('-', '_')
        return self.escape_label(ret)
 
    def get_graph(
            self, graph_type='digraph', rank='same', simplify=True,
            rankdir='TB', ranksep=0.2, compound=True):
        # Lucid version of pydot bugs with certain settings, not sure which
        # version exactly fixes those
        if LooseVersion(pydot.__version__) > LooseVersion('1.0.10'):
            graph = pydot.Dot('graphname',
                              graph_type=graph_type,
                              rank=rank,
                              rankdir=rankdir,
                              simplify=simplify
                              )
            graph.set_ranksep(ranksep)
            graph.set_compound(compound)
        else:
            graph = pydot.Dot('graphname',
                              graph_type=graph_type,
                              rank=rank,
                              rankdir=rankdir)
        return graph
 
    def add_node_to_graph(self,
                          graph,
                          nodename,
                          nodelabel=None,
                          shape='box',
                          color=None,
                          url=None,
                          tooltip=None):
        """
        Create a node item for this factory, adds it to the graph.
 
        Node name can vary from label but must always be same for the same node label
        """
        if nodename is None or nodename == '':
            raise ValueError('Empty Node name')
        if nodelabel is None:
            nodelabel = nodename
        node = pydot.Node(self.escape_name(nodename))
        node.set_shape(shape)
        node.set_label(self.escape_label(nodelabel))
        if tooltip is not None:
            node.set_tooltip(tooltip)
        elif url is not None:
            node.set_tooltip(url)
        if url is not None:
            node.set_URL(self.escape_name(url))
        if color is not None:
            node.set_color(color)
        graph.add_node(node)
 
    def add_subgraph_to_graph(self,
                              graph,
                              subgraphname,
                              rank='same',
                              simplify=True,
                              rankdir='TB',
                              ranksep=0.2,
                              compound=True,
                              color=None,
                              shape='box',
                              style='bold',
                              subgraphlabel=None):
        """
        Create a cluster subgraph item for this factory, adds it to the graph.
 
        cluster name can vary from label but must always be same for the same node label.
        Most layouters require cluster names to start with cluster.
        """
        if subgraphname is None or subgraphname == '':
            raise ValueError('Empty subgraph name')
        g = pydot.Cluster(self.escape_name(subgraphname),
                          rank=rank, rankdir=rankdir, simplify=simplify)
        if 'set_style' in g.__dict__:
            g.set_style(style)
        if 'set_shape' in g.__dict__:
            g.set_shape(shape)
        if LooseVersion(pydot.__version__) > LooseVersion('1.0.10'):
            g.set_compound(compound)
            g.set_ranksep(ranksep)
        subgraphlabel = subgraphname if subgraphlabel is None else subgraphlabel
        subgraphlabel = self.escape_label(subgraphlabel)
        if subgraphlabel:
            g.set_label(subgraphlabel)
        if 'set_color' in g.__dict__:
            if color is not None:
                g.set_color(color)
        graph.add_subgraph(g)
        return g
 
    def add_edge_to_graph(
            self, graph, nodename1, nodename2, label=None, url=None,
            simplify=True, style=None, penwidth=1, color=None):
        if simplify and LooseVersion(pydot.__version__) < LooseVersion('1.0.10'):
            if graph.get_edge(self.escape_name(nodename1), self.escape_name(nodename2)) != []:
                return
        edge = pydot.Edge(self.escape_name(nodename1), self.escape_name(nodename2))
        if label is not None and label != '':
            edge.set_label(label)
        if url is not None:
            edge.set_URL(self.escape_name(url))
        if style is not None:
            edge.set_style(style)
        edge.obj_dict['attributes']['penwidth'] = str(penwidth)
        if color is not None:
            edge.obj_dict['attributes']['colorR'] = str(color[0])
            edge.obj_dict['attributes']['colorG'] = str(color[1])
            edge.obj_dict['attributes']['colorB'] = str(color[2])
        graph.add_edge(edge)
 
    def create_dot(self, graph):
        dot = graph.create_dot()
        if type(dot) != str:
            dot = dot.decode()
        # sadly pydot generates line wraps cutting between numbers
        return dot.replace('\\%s' % os.linesep, '').replace('\\\n', '')