def __init__(self, title):
"""Initialize a new Book object with a specified title"""
self._BEGIN = datetime.datetime.now().isoformat()
self._END = datetime.datetime.now().isoformat()
# Initialize Book members
self._title = str(title).strip()
self._author = list()
self._meta = dict({'desc': str()})
self._nodes = dict()
# Create "Book Cover"
self._nodes[self._BEGIN] = Node()
self._nodes[self._BEGIN]._set_id(self._BEGIN)
self._nodes[self._BEGIN].set_text("[ " + self._title + " ]")
# Create "End Page"
self._nodes[self._END] = Node()
self._nodes[self._END]._set_id(self._END)
self._nodes[self._END].set_text("The End")
#
return None
def add_branch(self, node=None, text=None):
"""Add new node to specified existing node.
Input Arguments:
node - ID of node to branch off. Default is START_OF_BOOK
text - Text to associate with newly created node. Default is ""
Returns:
ID of newly created node
"""
node = node or self._BEGIN
assert(node in self._nodes)
new_node = Node()
new_id = new_node.get_id()
if text is not None:
new_node.set_text(text)
self._nodes[new_id] = new_node
self._nodes[node].add_link(new_id)
return new_id
def add_branch(self, node=None, text=None):
"""Add new node to specified existing node.
Input Arguments:
node - ID of node to branch off. Default is START_OF_BOOK
text - Text to associate with newly created node. Default is ""
Returns:
ID of newly created node
"""
node = node or self._BEGIN
assert (node in self._nodes)
new_node = Node()
new_id = new_node.get_id()
if text is not None:
new_node.set_text(text)
self._nodes[new_id] = new_node
self._nodes[node].add_link(new_id)
return new_id
def insert_branch(self, node, break_pt):
"""Break a specified node in two, thus introducing a new branch point.
Input Arguments:
node - ID of node to insert branch point
break_pt - location in node for new branch point
Returns:
ID of original node
"""
assert (node in self._nodes)
assert (0 < break_pt < len(self._nodes[node].get_text()))
new_node = Node()
new_id = new_node.get_id()
new_node.set_text(self._nodes[node].get_text()[break_pt:])
new_node._set_links(self._nodes[node].get_links())
self._nodes[new_id] = new_node
self._nodes[node].set_text(self._nodes[node].get_text()[0:break_pt])
self._nodes[node]._set_links({new_id: 0.0})
return node
def insert_branch(self, node, break_pt):
"""Break a specified node in two, thus introducing a new branch point.
Input Arguments:
node - ID of node to insert branch point
break_pt - location in node for new branch point
Returns:
ID of original node
"""
assert(node in self._nodes)
assert(0 < break_pt < len(self._nodes[node].get_text()))
new_node = Node()
new_id = new_node.get_id()
new_node.set_text(self._nodes[node].get_text()[break_pt:])
new_node._set_links(self._nodes[node].get_links())
self._nodes[new_id] = new_node
self._nodes[node].set_text(self._nodes[node].get_text()[0:break_pt])
self._nodes[node]._set_links({new_id: 0.0})
return node