def test_fmap():
t = Tree(1, [ Tree(2, [ Tree(3)
, Tree(4)
])
, Tree(5, [ Tree(6, [ Tree(7)
])
])
])
expected = Tree(2, [ Tree(4, [ Tree(6)
, Tree(8)
])
, Tree(10, [ Tree(12, [ Tree(14)
])
])
])
assert_equals(expected, t.fmap(lambda x: x*2))
def test_build_tree():
def children_for(x):
return range(0, x/2)
expected = Tree(8, [ Tree(0)
, Tree(1)
, Tree(2, [ Tree(0)
])
, Tree(3, [ Tree(0)
])
])
assert_equals(expected, Tree.build_tree(8, children_for))
def _build_manifest(cls, path, f, ignored_directories=None):
if not path:
raise ValueError("path must be a non-empty string")
if not f:
raise ValueError("transform function must be specified")
path = os.path.abspath(path)
if not os.path.isdir(path):
raise ValueError("{} does not name a directory".format(path))
if not ignored_directories:
ignored_directories = []
def child_directories(dirname):
names = [os.path.join(dirname, name) for name in os.listdir(dirname) if not name.startswith(".")]
return [name for name in names if os.path.isdir(name) and not name in ignored_directories]
directory_tree = Tree.build_tree(path, child_directories)
manifest_tree = directory_tree.fmap(f)
return { entry.path: entry for entry in itertools.chain.from_iterable(manifest_tree) }
def test_fmap_no_children():
t = Tree(1)
assert_equals(Tree(2), t.fmap(lambda x: x*2))
