# (List (Item "three"))))
## TODO: later: expand grammar
# S -> Cmd List "to" Item
# Cmd -> "delete"
############
t1 = Tree('List', [
Tree('Item', [1]),
Tree('List', [Tree('Item', [2]),
Tree('List', [Tree('Item', [3])])])
])
print(t1)
print(t1.flatten())
###########
# A slightly larger grammar
'''
S -> "copy" List "to" Item
S -> "delete" List
S -> "rename" Item "to" Item
List -> Item List | Item
'''
#(copy (List ...) to (Item ...))
#(copy (List f1 (List f2 (List f3))) to (Item folder))
# Tree('S', ['copy', Tree('List', [...]), to, Tree('Item', [...])])
## TODO: later: expand grammar
# S -> Cmd List "to" Item
# Cmd -> "delete"
############
t1 = Tree('List', [
Tree('Item', [1]),
Tree('List', [
Tree('Item', [2]),
Tree('List', [Tree('Item', [3])])])])
print(t1)
print(t1.flatten())
###########
# A slightly larger grammar
'''
S -> "copy" List "to" Item
S -> "delete" List
S -> "rename" Item "to" Item
List -> Item List | Item
'''
#(copy (List ...) to (Item ...))
#(copy (List f1 (List f2 (List f3))) to (Item folder))
# Tree('S', ['copy', Tree('List', [...]), to, Tree('Item', [...])])
