deb-python-pydotplus/dot_parser.py

496 lines
14 KiB
Python

# -*- 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 (tested with 0.9.10)
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
if len( top_graphs ) == 1:
return top_graphs[0]
return top_graphs
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' ).lstrip( unicode(codecs.BOM_UTF8, "utf8") )
data = data.encode( 'ascii' )
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