1 files changed, 54 insertions, 0 deletions
diff --git a/IO/GraphFile.cs b/IO/GraphFile.cs
new file mode 100644
index 0000000..9298e4b
--- /dev/null
+++ b/IO/GraphFile.cs
@@ -0,0 +1,54 @@
+using System.Text.RegularExpressions;
+using Graph.Interfaces;
+
+namespace Graph.IO
+{
+    public static class GraphFile
+    {
+        public static Graph<double> Read(IFileReader reader)
+        {
+            string[] lines = reader.Lines;
+            Graph<double> graph = new Graph<double>();
+
+            foreach (string line in reader.Lines)
+            {
+                // split string into vertex id and the edges
+                string[] parts = line.Split(" ", 2);
+
+                // parse vertex id
+                int vertex = int.Parse(parts[0]);
+
+                // parse edges, matches pairs of number two at a time, i.e. "num num"
+                Match match = Regex.Match(parts[1], @"[^ ]+ [^ ]+");
+                while (match.Success)
+                {
+                    // for each match, split the "vertex weight" pair 
+                    string[] edge = match.Value.Split(" ", 2);
+
+                    // add edge to graph (vertex1, vertex2, weight)
+                    graph.AddEdge(new Edge<double>(
+                        vertex,
+                        int.Parse(edge[0]),
+                        double.Parse(edge[1])
+                    ));
+
+                    // iterate match
+                    match = match.NextMatch();
+                }
+            }
+
+            return graph;
+        }
+
+        public static void Print(Graph<double> graph, IFileWriter writer)
+        {
+            string outstring = "";
+            graph.Vertices.ForEach(v =>
+            {
+                outstring += $"\n{v.Id}";
+                v.Edges.ForEach(e => outstring += $" {e.V} {e.Weight.ToString("F1")}");
+            });
+            writer.WriteAllText(outstring.Trim());
+        }
+    }
+}
+\ No newline at end of file