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it keeps it from trying to add the same node to the node set over and over if it matches multiple given patterns. Also in cases where there are a lot of patterns to be matched, and it matches an early one, this will make the script run slightly faster. It's more there because it logically should be, than anything else, I mean, Python is never going to be fast ;-) llvm-svn: 24876
112 lines
3.3 KiB
Python
112 lines
3.3 KiB
Python
#! /usr/bin/python
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#this is a script to extract given named nodes from a dot file, with
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#the associated edges. An edge is kept iff for edge x -> y
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# x and y are both nodes specified to be kept.
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#known issues: if a line contains '->' and is not an edge line
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#problems will occur. If node labels do not begin with
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#Node this also will not work. Since this is designed to work
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#on DSA dot output and not general dot files this is ok.
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#If you want to use this on other files rename the node labels
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#to Node[.*] with a script or something. This also relies on
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#the length of a node name being 13 characters (as it is in all
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#DSA dot output files)
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#Note that the name of the node can be any substring of the actual
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#name in the dot file. Thus if you say specify COLLAPSED
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#as a parameter this script will pull out all COLLAPSED
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#nodes in the file
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#Specifying escape characters in the name like \n also will not work,
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#as Python
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#will make it \\n, I'm not really sure how to fix this
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#currently the script prints the names it is searching for
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#to STDOUT, so you can check to see if they are what you intend
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import re
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import string
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import sys
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if len(sys.argv) < 3:
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print 'usage is ./DSAextract <dot_file_to_modify> \
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<output_file> [list of nodes to extract]'
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#open the input file
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input = open(sys.argv[1], 'r')
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#construct a set of node names
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node_name_set = set()
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for name in sys.argv[3:]:
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node_name_set |= set([name])
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#construct a list of compiled regular expressions from the
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#node_name_set
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regexp_list = []
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for name in node_name_set:
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regexp_list.append(re.compile(name))
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#used to see what kind of line we are on
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nodeexp = re.compile('Node')
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#used to check to see if the current line is an edge line
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arrowexp = re.compile('->')
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node_set = set()
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#read the file one line at a time
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buffer = input.readline()
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while buffer != '':
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#filter out the unecessary checks on all the edge lines
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if not arrowexp.search(buffer):
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#check to see if this is a node we are looking for
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for regexp in regexp_list:
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#if this name is for the current node, add the dot variable name
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#for the node (it will be Node(hex number)) to our set of nodes
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if regexp.search(buffer):
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node_set |= set([re.split('\s+',buffer,2)[1]])
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break
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buffer = input.readline()
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#test code
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#print '\n'
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print node_name_set
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#print node_set
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#open the output file
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output = open(sys.argv[2], 'w')
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#start the second pass over the file
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input = open(sys.argv[1], 'r')
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buffer = input.readline()
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while buffer != '':
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#there are three types of lines we are looking for
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#1) node lines, 2) edge lines 3) support lines (like page size, etc)
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#is this an edge line?
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#note that this is no completely robust, if a none edge line
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#for some reason contains -> it will be missidentified
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#hand edit the file if this happens
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if arrowexp.search(buffer):
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#check to make sure that both nodes are in the node list
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#if they are print this to output
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nodes = arrowexp.split(buffer)
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nodes[0] = string.strip(nodes[0])
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nodes[1] = string.strip(nodes[1])
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if nodes[0][:13] in node_set and \
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nodes[1][:13] in node_set:
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output.write(buffer)
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elif nodeexp.search(buffer): #this is a node line
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node = re.split('\s+', buffer,2)[1]
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if node in node_set:
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output.write(buffer)
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else: #this is a support line
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output.write(buffer)
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buffer = input.readline()
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