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"""RedundantImportDetector.py

Discover redundant java imports using brute force.

Requires Python 2.3"""

import os, sys, re

from glob import glob

reportFile = file("RedundantImports.txt", 'w')

startDir = 'D:\\aaa-TIJ4\\code'

# Regular expression to find the block of import statements:

findImports = re.compile("\n(?:import .*?\n)+")

baseDir = os.path.abspath(".")

print "basDir:", baseDir

def main():

for javaFile in glob("*.java") + glob("**/*.java"):

print javaFile

checkImports(os.path.join(baseDir, javaFile))

def checkImports(javaFile):

java = file(javaFile).read()

imports = findImports.search(java)

if imports:

imports = [f for f in imports.group(0).split('\n') if f != '']

fileParts = findImports.split(java)

assert len(fileParts) == 2

for mutated in mutateImports(imports):

file(javaFile, 'w').write(fileParts[0] + mutated + fileParts[1])

print "changing to", os.path.dirname(javaFile)

os.chdir(os.path.dirname(javaFile))

if os.system("javac " + os.path.basename(javaFile)) == 0:

print >>reportFile, javaFile + "\n" + mutated

redundantRemoved = "\n".join(

[m for m in mutated.split("\n")

if not m.startswith("//")])

print >>reportFile, redundantRemoved

file(javaFile, 'w').write(fileParts[0] +

redundantRemoved + fileParts[1])

return # No further attempts

file(javaFile, 'w').write(java) # Restore original file

def mutateImports(imports):

'''Generates different versions of imports, each with a

different line commented out'''

for i in range(len(imports)):

mutated = imports[:]

mutated[i] = '//' + mutated[i]

yield "\n".join([''] + mutated + [''])

if __name__ == "__main__": main()