Fixed line numbers for diagnostics. Also added a starter graph class so that i can traverse the include tree

server/src/graph.ts

@@ -0,0 +1,26 @@
+type Node = {
+  parents: Map<string, Node>
+  children: Map<string, Node>
+}
+
+export class Graph {
+  public nodes: Map<string, Node> = new Map()
+
+  public hasParents(uri: string): boolean {
+    return this.nodes.has(uri) ? this.nodes.get(uri).parents.size > 0 : false
+  }
+
+  public setParent(uri: string, parent: string) {
+    const par: Node = this.nodes.has(parent) ? this.nodes.get(parent) : {parents: new Map(), children: new Map()}
+    if (this.nodes.has(uri)) {
+      const node = this.nodes.get(uri)
+      node.parents.set(parent, par)
+      par.children.set(uri, node)
+    } else {
+      const node: Node = {parents: new Map([par].map(p => [parent, p]) as [string, Node][]), children: new Map()}
+      par.children.set(uri, node)
+      this.nodes.set(uri, node)
+    }
+    this.nodes.set(parent, par)
+  }
+}