Dotx is a full feature library for DOT file parsing and generation. The whole spec https://www.graphviz.org/doc/info/lang.html is implemented.
Documentation can be generated with ExDoc and published on HexDocs. Once published, the docs can be found at https://hexdocs.pm/dotx.
If available in Hex, the package can be installed
by adding khost_topo to your list of dependencies in mix.exs:
def deps do
[
{:dotx, "~> 0.3.0"}
]
endgraph = Dotx.decode(dot_string)
# now you can use graph : see `Dotx.graph()` typespec in doc for usage
dot_string = Dotx.encode(graph)
dot_string = "#{graph}"
# pretty print of graph in the dot format
# to_string() encode the graph thanks to String.Chars protocol
# You can flatten all edge shorthands of DOT : {a b}-> c -> d became
# {a b} a->c b->c b->d
flatgraph = Dotx.flatten(graph)
# You can add a unique ID for every graph and subgraph without one to allow
# easy graph property association of nodes and edges
idgraph = Dotx.identify(graph)
# You can Spread default attributes (`node [...]`, `graph [...]`, `edge [...]`
# to all edges/graphs/nodes descendants of attribute definitions
graph = Dotx.spread_attributes(graph)
# You can create a node database where all shorthands of dot (attributes
# inheritance, inline edges or edges between subgraph) are resolved to get a
# simple usable view of your graph
{nodes,graphs} = Dotx.to_nodes(graph)
%{attrs: %{"edges_from"=> from_a_edges, "graph"=>graphid, "otherattr"=>attr}} = nodes[["A"]]
nodea_graph = %{attrs: %{"someattr"=>attr}} = graphs[graphid]
[%{attrs: %{"someattr"=>attr, "graph"=>graphid}, to: %{id: tonodeid}}|_] = from_a_edges
firstnode_linked_to_a = nodes[tonodeid]
# You can use an erlang `:digraph` to handle your graph and make complex graph analysis :
digraph = Dotx.to_digraph(graph)
vertices = :digraph.get_short_path(digraph,["A"],["B"])