#!/usr/bin/env python3
"""Owner-aware diff of two `javap -public` dumps (one per JDK). Usage: api_diff.py OLD.txt NEW.txt"""
import sys

def load(p):
    cur, d = None, {}
    for line in open(p):
        line = line.rstrip("\n")
        if not line.strip():
            continue
        if not line.startswith(" "):
            cur = line.rstrip(" {").split(" extends ")[0].split(" implements ")[0].rsplit(" ", 1)[-1]
            d[cur] = {"__header__": line}
        elif line.strip() != "}":
            d[cur][line.strip()] = True
    return d

a, b = load(sys.argv[1]), load(sys.argv[2])
changes = 0
for c in sorted(set(a) | set(b)):
    if c not in a: print(f"+ class {c}"); changes += 1; continue
    if c not in b: print(f"- class {c}"); changes += 1; continue
    if a[c]["__header__"] != b[c]["__header__"]:
        print(f"~ {c}\n    was: {a[c]['__header__']}\n    now: {b[c]['__header__']}"); changes += 1
    for m in sorted(set(a[c]) - set(b[c]) - {"__header__"}): print(f"- {c}: {m}"); changes += 1
    for m in sorted(set(b[c]) - set(a[c]) - {"__header__"}): print(f"+ {c}: {m}"); changes += 1
print(f"{len(a)} classes in old, {len(b)} in new, {changes} difference(s)")