#!/usr/bin/env python

import unittest

def _destrvis(s):
	r = []
	state = 0
	for i in s:
		if state == 0:
			if i == '\\':
				state = 1
				v = 0
			else:
				r.append(i)
		elif state in (1, 2):
			v = v * 8 + int(i)
			state += 1
		elif state == 3:
			v = v * 8 + int(i)
			r.append(chr(v))
			state = 0
			
	return ''.join(r)

def parse(fname):
	with open(fname) as fp:
		i = fp.readline().strip()
		if not i.startswith('#mtree'):
			raise ValueError('not an mtree file')

		path = []
		res = {}

		while True:
			i = fp.readline().strip()

			# don't believe the bsdtar mtree output
			# contains the cases marked below
			if not i:
				break
			elif i.startswith('#'):	# pragma: no cover
				raise NotImplementedError
			elif i.startswith('/set'):	# pragma: no cover
				raise NotImplementedError
			elif i.startswith('/unset'):	# pragma: no cover
				raise NotImplementedError

			parts = i.split()
			fname = parts.pop(0)
			while parts[-1] == '\\':
				del parts[-1]
				parts.extend(fp.readline().strip().split())

			res[fname] = dict(x.split('=') for x in parts)

		return res

class Test(unittest.TestCase):
	def test_parsemtree(self):
		self.assertRaises(ValueError, parse, 'fixtures/genfixtures.py')

		data = parse('fixtures/sample.mtree')

		proof = {
			'.': {
				'time': '1567323634.0'
			},
			"./\\134\\040\\015\\012\\134*\\134?\\134['\\012": {
				'size': '0',
				'sha512digest': 'cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e',
				'time': '1567323609.0'
			},
			'./test.txt': {
				'size': '15',
				'sha512digest': '7d5768d47b6bc27dc4fa7e9732cfa2de506ca262a2749cb108923e5dddffde842bbfee6cb8d692fb43aca0f12946c521cce2633887914ca1f96898478d10ad3f',
				'time': '1567323634.0'
			},
		}

		self.assertEqual(data, proof)

	def test_debsstr(self):
		self.assertEqual(_destrvis(r'\015'), '\r')
		self.assertEqual(_destrvis(r'\011'), '\t')
		self.assertEqual(_destrvis(
		    "./\\134\\040\\015\\012\\134*\\134?\\134['\\012"),
		    "./\134\040\015\012\134*\134?\134['\012")