Function read_gml 

pub fn read_gml<R: Read>(input: R) -> IgraphResult<Graph>

Read a graph from GML format.

Parses the first graph [ ... ] block. Extracts directed (0 or 1, default 0), node [ id N ] entries, and edge [ source N target N ] entries. All other keys/values are skipped.

Node ids need not be contiguous or start at 0 — the reader maps them to internal vertex indices in the order they appear.

Examples

use rust_igraph::{Graph, read_gml};

let gml = b"graph [\n  directed 0\n  node [ id 1 ]\n  node [ id 2 ]\n  node [ id 3 ]\n  edge [ source 1 target 2 ]\n  edge [ source 2 target 3 ]\n]";
let g = read_gml(&gml[..]).unwrap();
assert_eq!(g.vcount(), 3);
assert_eq!(g.ecount(), 2);
assert!(!g.is_directed());