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diff --git a/utils/DSAextract.py b/utils/DSAextract.py
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+#! /usr/bin/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
+
+import re
+import string
+import sys
+
+
+if len(sys.argv) < 3:
+	print '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:
+	regexp_list.append(re.compile(name))
+
+#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 unecessary checks on all the edge lines
+	if not arrowexp.search(buffer):
+		#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
+			if regexp.search(buffer):
+				node_set |= set([re.split('\s+',buffer,2)[1]])
+	buffer = input.readline()
+
+
+#test code
+#print '\n'
+
+print node_name_set
+
+#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
+	if arrowexp.search(buffer):
+		#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:
+					output.write(buffer)
+	elif nodeexp.search(buffer): #this is a node line
+		node = re.split('\s+', buffer,2)[1]
+		if node in node_set:
+			output.write(buffer)
+	else: #this is a support line
+		output.write(buffer)
+	buffer = input.readline()
+