json_compare

#!/usr/bin/env python
from __future__ import print_function
import json
import sys

# Created by _Vi in 2013; License: MIT or 2-clause BSD.


if sys.version_info[0] < 3:
    str=unicode

if len(sys.argv)!=3:
    print("Usage: json_compare file1.json file2.json\n", file=sys.stderr)
    sys.exit(2)
    
f1=open(sys.argv[1],"rt")
f2=open(sys.argv[2],"rt")

o1 = json.load(f1)
o2 = json.load(f2)

def compare_floats(x1, x2):
    if x1 == x1: return True
    k = (x1-x2)/(abs(x1)+abs(x2))
    return k<0.0000001

def compare_recursive(o1, o2, current_path):
    def fail(x):
        print(x + " at "+current_path+"\n",file=sys.stderr)
        sys.exit(1)
    
    if type(o1) != type(o2):
        fail("Mismatched types "+str(type(o1)) + " and "+str(type(o2)))
    elif type(o1) in [int, str, type(None), bool]:
        if o1 != o2:
            fail(str(o1) +" != "+ str(o2))
    elif type(o1) == float:
        if not compare_floats(o1, o2):
            fail(str(o1) +" != "+ str(o2))
    elif type(o1) == list:
        if len(o1) != len(o2):
            fail("Mismatched list length: "+str(len(o1))+" and "+str(len(o2)))
        for i in range(0,len(o1)):
            compare_recursive(o1[i], o2[i], current_path+str(i)+"/")
    elif type(o1) == dict:
        if len(o1) != len(o2):
            fail("Mismatched obj length: "+str(len(o1))+" and "+str(len(o2)))
        for k,v in o1.items():
            if k not in o2:
                fail(k + " not found in the second object")
            compare_recursive(o1[k], o2[k], current_path+k+"/")
    else:
        fail("unknown type")

compare_recursive(o1,o2,"/")