496 lines
14 KiB
Python
496 lines
14 KiB
Python
# -*- coding: Latin-1 -*-
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"""Graphviz's dot language parser.
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The dotparser parses graphviz files in dot and dot files and transforms them
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into a class representation defined by pydot.
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The module needs pyparsing (tested with version 1.2.2) and pydot (tested with 0.9.10)
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Author: Michael Krause <michael@krause-software.de>
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Fixes by: Ero Carrera <ero@dkbza.org>
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"""
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__author__ = ['Michael Krause', 'Ero Carrera']
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__license__ = 'MIT'
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import sys
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import glob
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import pydot
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import re
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import codecs
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from pyparsing import __version__ as pyparsing_version
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from pyparsing import ( nestedExpr, Literal, CaselessLiteral, Word, Upcase, OneOrMore, ZeroOrMore,
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Forward, NotAny, delimitedList, oneOf, Group, Optional, Combine, alphas, nums,
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restOfLine, cStyleComment, nums, alphanums, printables, empty, quotedString,
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ParseException, ParseResults, CharsNotIn, _noncomma, dblQuotedString, QuotedString, ParserElement )
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class P_AttrList:
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def __init__(self, toks):
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self.attrs = {}
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i = 0
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while i < len(toks):
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attrname = toks[i]
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if i+2 < len(toks) and toks[i+1] == '=':
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attrvalue = toks[i+2]
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i += 3
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else:
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attrvalue = None
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i += 1
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self.attrs[attrname] = attrvalue
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def __repr__(self):
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return "%s(%r)" % (self.__class__.__name__, self.attrs)
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class DefaultStatement(P_AttrList):
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def __init__(self, default_type, attrs):
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self.default_type = default_type
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self.attrs = attrs
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def __repr__(self):
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return "%s(%s, %r)" % (self.__class__.__name__,
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self.default_type, self.attrs)
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top_graphs = list()
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def push_top_graph_stmt(str, loc, toks):
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attrs = {}
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g = None
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for element in toks:
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if( isinstance(element, (ParseResults, tuple, list)) and
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len(element) == 1 and isinstance(element[0], basestring) ):
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element = element[0]
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if element == 'strict':
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attrs['strict'] = True
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elif element in ['graph', 'digraph']:
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attrs = {}
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g = pydot.Dot(graph_type=element, **attrs)
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attrs['type'] = element
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top_graphs.append( g )
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elif isinstance( element, basestring):
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g.set_name( element )
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elif isinstance(element, pydot.Subgraph):
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g.obj_dict['attributes'].update( element.obj_dict['attributes'] )
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g.obj_dict['edges'].update( element.obj_dict['edges'] )
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g.obj_dict['nodes'].update( element.obj_dict['nodes'] )
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g.obj_dict['subgraphs'].update( element.obj_dict['subgraphs'] )
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g.set_parent_graph(g)
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elif isinstance(element, P_AttrList):
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attrs.update(element.attrs)
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elif isinstance(element, (ParseResults, list)):
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add_elements(g, element)
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else:
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raise ValueError, "Unknown element statement: %r " % element
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if len( top_graphs ) == 1:
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return top_graphs[0]
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return top_graphs
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def add_defaults(element, defaults):
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d = element.__dict__
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for key, value in defaults.items():
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if not d.get(key):
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d[key] = value
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def add_elements(g, toks, defaults_graph=None, defaults_node=None, defaults_edge=None):
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if defaults_graph is None:
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defaults_graph = {}
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if defaults_node is None:
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defaults_node = {}
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if defaults_edge is None:
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defaults_edge = {}
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for elm_idx, element in enumerate(toks):
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if isinstance(element, (pydot.Subgraph, pydot.Cluster)):
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add_defaults(element, defaults_graph)
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g.add_subgraph(element)
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elif isinstance(element, pydot.Node):
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add_defaults(element, defaults_node)
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g.add_node(element)
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elif isinstance(element, pydot.Edge):
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add_defaults(element, defaults_edge)
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g.add_edge(element)
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elif isinstance(element, ParseResults):
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for e in element:
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add_elements(g, [e], defaults_graph, defaults_node, defaults_edge)
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elif isinstance(element, DefaultStatement):
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if element.default_type == 'graph':
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default_graph_attrs = pydot.Node('graph', **element.attrs)
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g.add_node(default_graph_attrs)
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elif element.default_type == 'node':
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default_node_attrs = pydot.Node('node', **element.attrs)
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g.add_node(default_node_attrs)
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elif element.default_type == 'edge':
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default_edge_attrs = pydot.Node('edge', **element.attrs)
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g.add_node(default_edge_attrs)
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defaults_edge.update(element.attrs)
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else:
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raise ValueError, "Unknown DefaultStatement: %s " % element.default_type
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elif isinstance(element, P_AttrList):
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g.obj_dict['attributes'].update(element.attrs)
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else:
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raise ValueError, "Unknown element statement: %r" % element
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def push_graph_stmt(str, loc, toks):
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g = pydot.Subgraph('')
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add_elements(g, toks)
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return g
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def push_subgraph_stmt(str, loc, toks):
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g = pydot.Subgraph('')
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for e in toks:
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if len(e)==3:
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e[2].set_name(e[1])
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if e[0] == 'subgraph':
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e[2].obj_dict['show_keyword'] = True
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return e[2]
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else:
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if e[0] == 'subgraph':
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e[1].obj_dict['show_keyword'] = True
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return e[1]
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return g
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def push_default_stmt(str, loc, toks):
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# The pydot class instances should be marked as
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# default statements to be inherited by actual
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# graphs, nodes and edges.
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#
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default_type = toks[0][0]
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if len(toks) > 1:
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attrs = toks[1].attrs
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else:
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attrs = {}
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if default_type in ['graph', 'node', 'edge']:
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return DefaultStatement(default_type, attrs)
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else:
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raise ValueError, "Unknown default statement: %r " % toks
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def push_attr_list(str, loc, toks):
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p = P_AttrList(toks)
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return p
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def get_port(node):
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if len(node)>1:
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if isinstance(node[1], ParseResults):
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if len(node[1][0])==2:
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if node[1][0][0]==':':
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return node[1][0][1]
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return None
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def do_node_ports(node):
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node_port = ''
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if len(node) > 1:
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node_port = ''.join( [str(a)+str(b) for a,b in node[1] ] )
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return node_port
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def push_edge_stmt(str, loc, toks):
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tok_attrs = [a for a in toks if isinstance(a, P_AttrList)]
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attrs = {}
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for a in tok_attrs:
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attrs.update(a.attrs)
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e = []
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if isinstance(toks[0][0], pydot.Graph):
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n_prev = pydot.frozendict(toks[0][0].obj_dict)
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else:
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n_prev = toks[0][0] + do_node_ports( toks[0] )
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if isinstance(toks[2][0], ParseResults):
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n_next_list = [[n.get_name(),] for n in toks[2][0] ]
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for n_next in [n for n in n_next_list]:
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n_next_port = do_node_ports(n_next)
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e.append(pydot.Edge(n_prev, n_next[0]+n_next_port, **attrs))
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elif isinstance(toks[2][0], pydot.Graph):
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e.append(pydot.Edge(n_prev, pydot.frozendict(toks[2][0].obj_dict), **attrs))
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elif isinstance(toks[2][0], pydot.Node):
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node = toks[2][0]
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if node.get_port() is not None:
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name_port = node.get_name() + ":" + node.get_port()
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else:
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name_port = node.get_name()
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e.append(pydot.Edge(n_prev, name_port, **attrs))
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elif isinstance(toks[2][0], type('')):
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for n_next in [n for n in tuple(toks)[2::2]]:
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if isinstance(n_next, P_AttrList) or not isinstance(n_next[0], type('')):
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continue
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n_next_port = do_node_ports( n_next )
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e.append(pydot.Edge(n_prev, n_next[0]+n_next_port, **attrs))
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n_prev = n_next[0]+n_next_port
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else:
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# UNEXPECTED EDGE TYPE
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pass
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return e
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def push_node_stmt(s, loc, toks):
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if len(toks) == 2:
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attrs = toks[1].attrs
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else:
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attrs = {}
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node_name = toks[0]
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if isinstance(node_name, list) or isinstance(node_name, tuple):
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if len(node_name)>0:
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node_name = node_name[0]
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n = pydot.Node(str(node_name), **attrs)
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return n
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graphparser = None
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def graph_definition():
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global graphparser
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if not graphparser:
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# punctuation
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colon = Literal(":")
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lbrace = Literal("{")
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rbrace = Literal("}")
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lbrack = Literal("[")
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rbrack = Literal("]")
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lparen = Literal("(")
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rparen = Literal(")")
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equals = Literal("=")
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comma = Literal(",")
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dot = Literal(".")
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slash = Literal("/")
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bslash = Literal("\\")
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star = Literal("*")
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semi = Literal(";")
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at = Literal("@")
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minus = Literal("-")
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# keywords
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strict_ = CaselessLiteral("strict")
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graph_ = CaselessLiteral("graph")
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digraph_ = CaselessLiteral("digraph")
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subgraph_ = CaselessLiteral("subgraph")
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node_ = CaselessLiteral("node")
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edge_ = CaselessLiteral("edge")
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# token definitions
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identifier = Word(alphanums + "_." ).setName("identifier")
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double_quoted_string = QuotedString('"', multiline=True, unquoteResults=False) # dblQuotedString
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alphastring_ = OneOrMore(CharsNotIn(_noncomma + ' '))
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def parse_html(s, loc, toks):
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return '<%s>' % ''.join(toks[0])
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opener = '<'
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closer = '>'
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html_text = nestedExpr( opener, closer,
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( CharsNotIn( opener + closer ) )
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).setParseAction(parse_html).leaveWhitespace()
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ID = ( identifier | html_text |
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double_quoted_string | #.setParseAction(strip_quotes) |
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alphastring_ ).setName("ID")
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float_number = Combine(Optional(minus) +
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OneOrMore(Word(nums + "."))).setName("float_number")
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righthand_id = (float_number | ID ).setName("righthand_id")
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port_angle = (at + ID).setName("port_angle")
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port_location = (OneOrMore(Group(colon + ID)) |
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Group(colon + lparen + ID + comma + ID + rparen)).setName("port_location")
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port = (Group(port_location + Optional(port_angle)) |
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Group(port_angle + Optional(port_location))).setName("port")
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node_id = (ID + Optional(port))
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a_list = OneOrMore(ID + Optional(equals + righthand_id) +
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Optional(comma.suppress())).setName("a_list")
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attr_list = OneOrMore(lbrack.suppress() + Optional(a_list) +
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rbrack.suppress()).setName("attr_list")
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attr_stmt = (Group(graph_ | node_ | edge_) + attr_list).setName("attr_stmt")
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edgeop = (Literal("--") | Literal("->")).setName("edgeop")
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stmt_list = Forward()
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graph_stmt = Group(lbrace.suppress() + Optional(stmt_list) +
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rbrace.suppress() + Optional(semi.suppress()) ).setName("graph_stmt")
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edge_point = Forward()
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edgeRHS = OneOrMore(edgeop + edge_point)
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edge_stmt = edge_point + edgeRHS + Optional(attr_list)
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subgraph = Group(subgraph_ + Optional(ID) + graph_stmt).setName("subgraph")
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edge_point << Group(subgraph | graph_stmt | node_id ).setName('edge_point')
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node_stmt = (node_id + Optional(attr_list) + Optional(semi.suppress())).setName("node_stmt")
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assignment = (ID + equals + righthand_id).setName("assignment")
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stmt = (assignment | edge_stmt | attr_stmt | subgraph | graph_stmt | node_stmt).setName("stmt")
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stmt_list << OneOrMore(stmt + Optional(semi.suppress()))
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graphparser = OneOrMore( (Optional(strict_) + Group((graph_ | digraph_)) +
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Optional(ID) + graph_stmt).setResultsName("graph") )
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singleLineComment = Group("//" + restOfLine) | Group("#" + restOfLine)
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# actions
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graphparser.ignore(singleLineComment)
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graphparser.ignore(cStyleComment)
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assignment.setParseAction(push_attr_list)
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a_list.setParseAction(push_attr_list)
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edge_stmt.setParseAction(push_edge_stmt)
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node_stmt.setParseAction(push_node_stmt)
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attr_stmt.setParseAction(push_default_stmt)
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subgraph.setParseAction(push_subgraph_stmt)
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graph_stmt.setParseAction(push_graph_stmt)
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graphparser.setParseAction(push_top_graph_stmt)
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return graphparser
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def parse_dot_data(data):
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global top_graphs
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top_graphs = list()
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if data.startswith( codecs.BOM_UTF8 ):
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data = data.decode( 'utf-8' ).lstrip( unicode(codecs.BOM_UTF8, "utf8") )
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data = data.encode( 'ascii' )
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try:
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graphparser = graph_definition()
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if pyparsing_version >= '1.2':
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graphparser.parseWithTabs()
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tokens = graphparser.parseString(data)
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if len(tokens) == 1:
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return tokens[0]
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else:
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return [g for g in tokens]
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except ParseException, err:
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print err.line
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print " "*(err.column-1) + "^"
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print err
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return None
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