import sys
import subprocess
import re
import os
import shutil
import json

# usage
# python class-hierarchy.py *directory to scan within*
# outputs nested json
 
if len(sys.argv) < 2:
    print "No path specified"
    sys.exit()
    
path = sys.argv[1]

hasSuperclass = set()
allClassNames = set()
allClasses = {}

for dirpath, dnames, fnames in os.walk(path):
    for f in fnames:
        # if f.endswith(".h") or f.endswith(".m"):
        path = dirpath + '/' + f;
        aFile = open(path)
        for match in re.finditer("@interface\s+(\w+)\s+:\s+(\w+)", aFile.read()):
            if match != None:
                className = match.group(1)
                superClassName = match.group(2)
                # print className + ' ' + superClassName
                if not className in allClasses:
                    classDict = {}
                    allClasses[className] = classDict
                else:
                    classDict = allClasses[className]
                    
                if not superClassName in allClasses:
                    allClasses[superClassName] = {className: classDict}
                else:
                    allClasses[superClassName][className] = classDict
                    
                hasSuperclass.add(className)
                allClassNames.add(superClassName)
                allClassNames.add(className)
                
rootClassNames = allClassNames.difference(hasSuperclass)

tree = {}

for rootClassName in rootClassNames:
    tree[rootClassName] = allClasses[rootClassName]

print json.dumps(tree)