new loplugin to find public methods that can be private

based on the unusedmethods plugin, which I should probably rename at
some point

Change-Id: If197423c59d4350ea1fdc69e99d24b631d9751b9

compilerplugins/clang/unusedmethods.py

@@ -5,10 +5,13 @@ import re
 import io
 
 definitionSet = set()
+publicDefinitionSet = set()
 definitionToSourceLocationMap = dict()
 callSet = set()
-returnSet = set()
+usedReturnSet = set()
 sourceLocationSet = set()
+calledFromOutsideSet = set()
+
 # things we need to exclude for reasons like :
 # - it's a weird template thingy that confuses the plugin
 exclusionSet = set([
@@ -120,19 +123,35 @@ with io.open(sys.argv[1], "rb", buffering=1024*1024) as txt:
         if line.startswith("definition:\t"):
             idx1 = line.find("\t",12)
             idx2 = line.find("\t",idx1+1)
-            funcInfo = (normalizeTypeParams(line[12:idx1]), normalizeTypeParams(line[idx1+1:idx2]))
+            idx3 = line.find("\t",idx2+1)
+            access = line[12:idx1]
+            returnType = line[idx1+1:idx2]
+            nameAndParams = line[idx2+1:idx3]
+            sourceLocation = line[idx3+1:].strip()
+            funcInfo = (normalizeTypeParams(returnType), normalizeTypeParams(nameAndParams))
             definitionSet.add(funcInfo)
-            definitionToSourceLocationMap[funcInfo] = line[idx2+1:].strip()
+            if access == "public":
+                publicDefinitionSet.add(funcInfo)
+            definitionToSourceLocationMap[funcInfo] = sourceLocation
         elif line.startswith("call:\t"):
             idx1 = line.find("\t",6)
-            callSet.add((normalizeTypeParams(line[6:idx1]), normalizeTypeParams(line[idx1+1:].strip())))
+            returnType = line[6:idx1]
+            nameAndParams = line[idx1+1:].strip()
+            callSet.add((normalizeTypeParams(returnType), normalizeTypeParams(nameAndParams)))
         elif line.startswith("usedReturn:\t"):
             idx1 = line.find("\t",12)
-            returnSet.add((normalizeTypeParams(line[12:idx1]), normalizeTypeParams(line[idx1+1:].strip())))
+            returnType = line[12:idx1]
+            nameAndParams = line[idx1+1:].strip()
+            usedReturnSet.add((normalizeTypeParams(returnType), normalizeTypeParams(nameAndParams)))
+        elif line.startswith("calledFromOutsideSet:\t"):
+            idx1 = line.find("\t",22)
+            returnType = line[22:idx1]
+            nameAndParams = line[idx1+1:].strip()
+            calledFromOutsideSet.add((normalizeTypeParams(returnType), normalizeTypeParams(nameAndParams)))
 
-# Invert the definitionToSourceLocationMap
+# Invert the definitionToSourceLocationMap.
 # If we see more than one method at the same sourceLocation, it's being autogenerated as part of a template
-# and we should just ignore
+# and we should just ignore it.
 sourceLocationToDefinitionMap = {}
 for k, v in definitionToSourceLocationMap.iteritems():
     sourceLocationToDefinitionMap[v] = sourceLocationToDefinitionMap.get(v, [])
@@ -253,11 +272,9 @@ tmp1list = sorted(tmp1set, key=lambda v: natural_sort_key(v[1]))
 tmp2set = set()
 for d in definitionSet:
     clazz = d[0] + " " + d[1]
-    if clazz in exclusionSet:
+    if d in usedReturnSet:
         continue
-    if d in returnSet:
-        continue
-    if isOtherConstness(d, returnSet):
+    if isOtherConstness(d, usedReturnSet):
         continue
     if d[0] == "void":
         continue
@@ -287,7 +304,31 @@ for d in definitionSet:
 # sort results by name and line number
 tmp2list = sorted(tmp2set, key=lambda v: natural_sort_key(v[1]))
     
-for t in tmp2list:
+#for t in tmp2list:
+#    print t[1]
+#    print "    ", t[0]
+
+
+# -------------------------------------------
+# Do the "unnecessary public" part
+# -------------------------------------------
+
+tmp3set = set()
+for d in publicDefinitionSet:
+    clazz = d[0] + " " + d[1]
+    if d in calledFromOutsideSet:
+        continue
+    if isOtherConstness(d, calledFromOutsideSet):
+        continue
+    # ignore external code
+    if definitionToSourceLocationMap[d].startswith("external/"):
+       continue
+    tmp3set.add((clazz, definitionToSourceLocationMap[d]))
+
+# sort results by name and line number
+tmp3list = sorted(tmp3set, key=lambda v: natural_sort_key(v[1]))
+    
+for t in tmp3list:
     print t[1]
     print "    ", t[0]