blob: 96f818bd2a8316ce4d1e664846d95fd3247b6f03 [file] [log] [blame]
#!/usr/bin/env python
# this is a script to extract given named nodes from a dot file, with
# the associated edges. An edge is kept iff for edge x -> y
# x and y are both nodes specified to be kept.
# known issues: if a line contains '->' and is not an edge line
# problems will occur. If node labels do not begin with
# Node this also will not work. Since this is designed to work
# on DSA dot output and not general dot files this is ok.
# If you want to use this on other files rename the node labels
# to Node[.*] with a script or something. This also relies on
# the length of a node name being 13 characters (as it is in all
# DSA dot output files)
# Note that the name of the node can be any substring of the actual
# name in the dot file. Thus if you say specify COLLAPSED
# as a parameter this script will pull out all COLLAPSED
# nodes in the file
# Specifying escape characters in the name like \n also will not work,
# as Python
# will make it \\n, I'm not really sure how to fix this
# currently the script prints the names it is searching for
# to STDOUT, so you can check to see if they are what you intend
from __future__ import print_function
import re
import string
import sys
if len(sys.argv) < 3:
"usage is ./DSAextract <dot_file_to_modify> \
<output_file> [list of nodes to extract]"
# open the input file
input = open(sys.argv[1], "r")
# construct a set of node names
node_name_set = set()
for name in sys.argv[3:]:
node_name_set |= set([name])
# construct a list of compiled regular expressions from the
# node_name_set
regexp_list = []
for name in node_name_set:
# used to see what kind of line we are on
nodeexp = re.compile("Node")
# used to check to see if the current line is an edge line
arrowexp = re.compile("->")
node_set = set()
# read the file one line at a time
buffer = input.readline()
while buffer != "":
# filter out the unnecessary checks on all the edge lines
if not
# check to see if this is a node we are looking for
for regexp in regexp_list:
# if this name is for the current node, add the dot variable name
# for the node (it will be Node(hex number)) to our set of nodes
node_set |= set([re.split("\s+", buffer, 2)[1]])
buffer = input.readline()
# test code
# print '\n'
# print node_set
# open the output file
output = open(sys.argv[2], "w")
# start the second pass over the file
input = open(sys.argv[1], "r")
buffer = input.readline()
while buffer != "":
# there are three types of lines we are looking for
# 1) node lines, 2) edge lines 3) support lines (like page size, etc)
# is this an edge line?
# note that this is no completely robust, if a none edge line
# for some reason contains -> it will be missidentified
# hand edit the file if this happens
# check to make sure that both nodes are in the node list
# if they are print this to output
nodes = arrowexp.split(buffer)
nodes[0] = string.strip(nodes[0])
nodes[1] = string.strip(nodes[1])
if nodes[0][:13] in node_set and nodes[1][:13] in node_set:
elif # this is a node line
node = re.split("\s+", buffer, 2)[1]
if node in node_set:
else: # this is a support line
buffer = input.readline()