253 lines
8.1 KiB
Python
253 lines
8.1 KiB
Python
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#!/usr/bin/env python
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from __future__ import absolute_import, division, print_function
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import os
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import re
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import subprocess
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import sys
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import tempfile
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###
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class DeltaAlgorithm(object):
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def __init__(self):
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self.cache = set()
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def test(self, changes):
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abstract
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###
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def getTestResult(self, changes):
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# There is no reason to cache successful tests because we will
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# always reduce the changeset when we see one.
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changeset = frozenset(changes)
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if changeset in self.cache:
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return False
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elif not self.test(changes):
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self.cache.add(changeset)
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return False
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else:
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return True
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def run(self, changes, force=False):
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# Make sure the initial test passes, if not then (a) either
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# the user doesn't expect monotonicity, and we may end up
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# doing O(N^2) tests, or (b) the test is wrong. Avoid the
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# O(N^2) case unless user requests it.
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if not force:
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if not self.getTestResult(changes):
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raise ValueError('Initial test passed to delta fails.')
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# Check empty set first to quickly find poor test functions.
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if self.getTestResult(set()):
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return set()
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else:
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return self.delta(changes, self.split(changes))
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def split(self, S):
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"""split(set) -> [sets]
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Partition a set into one or two pieces.
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"""
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# There are many ways to split, we could do a better job with more
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# context information (but then the API becomes grosser).
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L = list(S)
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mid = len(L)//2
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if mid==0:
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return L,
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else:
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return L[:mid],L[mid:]
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def delta(self, c, sets):
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# assert(reduce(set.union, sets, set()) == c)
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# If there is nothing left we can remove, we are done.
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if len(sets) <= 1:
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return c
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# Look for a passing subset.
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res = self.search(c, sets)
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if res is not None:
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return res
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# Otherwise, partition sets if possible; if not we are done.
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refined = sum(map(list, map(self.split, sets)), [])
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if len(refined) == len(sets):
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return c
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return self.delta(c, refined)
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def search(self, c, sets):
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for i,S in enumerate(sets):
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# If test passes on this subset alone, recurse.
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if self.getTestResult(S):
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return self.delta(S, self.split(S))
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# Otherwise if we have more than two sets, see if test
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# pases without this subset.
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if len(sets) > 2:
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complement = sum(sets[:i] + sets[i+1:],[])
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if self.getTestResult(complement):
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return self.delta(complement, sets[:i] + sets[i+1:])
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###
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class Token(object):
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def __init__(self, type, data, flags, file, line, column):
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self.type = type
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self.data = data
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self.flags = flags
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self.file = file
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self.line = line
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self.column = column
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kTokenRE = re.compile(r"""([a-z_]+) '(.*)'\t(.*)\tLoc=<(.*):(.*):(.*)>""",
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re.DOTALL | re.MULTILINE)
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def getTokens(path):
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p = subprocess.Popen(['clang','-dump-raw-tokens',path],
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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out,err = p.communicate()
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tokens = []
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collect = None
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for ln in err.split('\n'):
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# Silly programmers refuse to print in simple machine readable
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# formats. Whatever.
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if collect is None:
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collect = ln
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else:
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collect = collect + '\n' + ln
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if 'Loc=<' in ln and ln.endswith('>'):
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ln,collect = collect,None
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tokens.append(Token(*kTokenRE.match(ln).groups()))
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return tokens
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###
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class TMBDDelta(DeltaAlgorithm):
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def __init__(self, testProgram, tokenLists, log):
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def patchName(name, suffix):
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base,ext = os.path.splitext(name)
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return base + '.' + suffix + ext
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super(TMBDDelta, self).__init__()
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self.testProgram = testProgram
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self.tokenLists = tokenLists
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self.tempFiles = [patchName(f,'tmp')
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for f,_ in self.tokenLists]
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self.targetFiles = [patchName(f,'ok')
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for f,_ in self.tokenLists]
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self.log = log
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self.numTests = 0
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def writeFiles(self, changes, fileNames):
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assert len(fileNames) == len(self.tokenLists)
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byFile = [[] for i in self.tokenLists]
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for i,j in changes:
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byFile[i].append(j)
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for i,(file,tokens) in enumerate(self.tokenLists):
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f = open(fileNames[i],'w')
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for j in byFile[i]:
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f.write(tokens[j])
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f.close()
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return byFile
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def test(self, changes):
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self.numTests += 1
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byFile = self.writeFiles(changes, self.tempFiles)
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if self.log:
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print('TEST - ', end=' ', file=sys.stderr)
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if self.log > 1:
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for i,(file,_) in enumerate(self.tokenLists):
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indices = byFile[i]
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if i:
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sys.stderr.write('\n ')
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sys.stderr.write('%s:%d tokens: [' % (file,len(byFile[i])))
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prev = None
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for j in byFile[i]:
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if prev is None or j != prev + 1:
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if prev:
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sys.stderr.write('%d][' % prev)
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sys.stderr.write(str(j))
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sys.stderr.write(':')
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prev = j
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if byFile[i]:
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sys.stderr.write(str(byFile[i][-1]))
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sys.stderr.write('] ')
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else:
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print(', '.join(['%s:%d tokens' % (file, len(byFile[i]))
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for i,(file,_) in enumerate(self.tokenLists)]), end=' ', file=sys.stderr)
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p = subprocess.Popen([self.testProgram] + self.tempFiles)
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res = p.wait() == 0
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if res:
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self.writeFiles(changes, self.targetFiles)
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if self.log:
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print('=> %s' % res, file=sys.stderr)
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else:
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if res:
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print('\nSUCCESS (%d tokens)' % len(changes))
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else:
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sys.stderr.write('.')
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return res
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def run(self):
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res = super(TMBDDelta, self).run([(i,j)
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for i,(file,tokens) in enumerate(self.tokenLists)
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for j in range(len(tokens))])
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self.writeFiles(res, self.targetFiles)
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if not self.log:
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print(file=sys.stderr)
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return res
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def tokenBasedMultiDelta(program, files, log):
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# Read in the lists of tokens.
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tokenLists = [(file, [t.data for t in getTokens(file)])
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for file in files]
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numTokens = sum([len(tokens) for _,tokens in tokenLists])
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print("Delta on %s with %d tokens." % (', '.join(files), numTokens))
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tbmd = TMBDDelta(program, tokenLists, log)
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res = tbmd.run()
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print("Finished %s with %d tokens (in %d tests)." % (', '.join(tbmd.targetFiles),
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len(res),
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tbmd.numTests))
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def main():
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from optparse import OptionParser, OptionGroup
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parser = OptionParser("%prog <test program> {files+}")
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parser.add_option("", "--debug", dest="debugLevel",
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help="set debug level [default %default]",
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action="store", type=int, default=0)
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(opts, args) = parser.parse_args()
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if len(args) <= 1:
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parser.error('Invalid number of arguments.')
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program,files = args[0],args[1:]
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md = tokenBasedMultiDelta(program, files, log=opts.debugLevel)
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if __name__ == '__main__':
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try:
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main()
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except KeyboardInterrupt:
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print('Interrupted.', file=sys.stderr)
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os._exit(1) # Avoid freeing our giant cache.
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