11.10 Map

RedundantImportDetector.py

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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()
+