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Add dot_parser.py

This commit is contained in:
Thomas Applencourt 2015-07-16 08:59:10 +02:00
parent 7eee7cc36d
commit 21d5f63841

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