From 651c3f7c944abeeee188325e4ec83ea76372c510 Mon Sep 17 00:00:00 2001
From: WayneCui <zhuxiaozhu8167@163.com>
Date: Fri, 15 Mar 2019 21:04:35 +0800
Subject: [PATCH] FEAT: add dsf by JS

---
 javascript/43_topological_sorting/dsf.js | 91 ++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 javascript/43_topological_sorting/dsf.js

diff --git a/javascript/43_topological_sorting/dsf.js b/javascript/43_topological_sorting/dsf.js
new file mode 100644
index 00000000..0f9016b1
--- /dev/null
+++ b/javascript/43_topological_sorting/dsf.js
@@ -0,0 +1,91 @@
+
+function Graph() {
+    var graph = {
+        adj: new Map(),
+        addEdge: function (from, to){
+            if(!this.adj.get(from)) {
+                this.adj.set(from, [ to ]);
+            } else {
+                this.adj.get(from).push(to);
+            }
+        },
+        sortingByDsf: function(){
+            var inverseAdj = new Map();
+            var keys = this.adj.keys();
+            for(let key of keys) {
+                let blk = this.adj.get(key);
+                if(blk) {
+                    for(let v of blk) {
+                        if(!inverseAdj.get(v)) {
+                            inverseAdj.set(v, [key]);
+                        } else {
+                            inverseAdj.get(v).push(key);
+                        }
+                    }
+                }
+            }
+
+            let inKeys = inverseAdj.keys();
+            let vertexes = new Set([...keys, ...inKeys]);
+            let visited = [];
+            for(let vertex of vertexes) {
+                if(!visited.includes(vertex)) {
+                    visited.push(vertex);
+                    this.dsf(vertex, inverseAdj, visited);
+                }
+            }
+        },
+        dsf: function(vertex, inverseAdj, visited) {
+            if(!inverseAdj.get(vertex)) {
+                inverseAdj.set(vertex, []);
+            }
+
+            for(let v of inverseAdj.get(vertex)) {
+                if(visited.includes(v)) {
+                    continue;
+                }
+
+                visited.push(v);
+
+                this.dsf(v, inverseAdj, visited);
+            }
+
+            console.log("->" + vertex);
+        }
+    }
+
+    return graph;
+}
+
+var dag = new Graph();
+dag.addEdge(2, 1);
+dag.addEdge(3, 2);
+dag.addEdge(2, 4);
+dag.addEdge(4, 1);
+dag.sortingByDsf();
+
+
+var dag2 = new Graph();
+dag2.addEdge("main", "parse_options");
+dag2.addEdge("main", "tail_file");
+dag2.addEdge("main", "tail_forever");
+dag2.addEdge("tail_file", "pretty_name");
+dag2.addEdge("tail_file", "write_header");
+dag2.addEdge("tail_file", "tail");
+dag2.addEdge("tail_forever", "recheck");
+dag2.addEdge("tail_forever", "pretty_name");
+dag2.addEdge("tail_forever", "write_header");
+dag2.addEdge("tail_forever", "dump_remainder");
+dag2.addEdge("tail", "tail_lines");
+dag2.addEdge("tail", "tail_bytes");
+dag2.addEdge("tail_lines", "start_lines");
+dag2.addEdge("tail_lines", "dump_remainder");
+dag2.addEdge("tail_lines", "file_lines");
+dag2.addEdge("tail_lines", "pipe_lines");
+dag2.addEdge("tail_bytes", "xlseek");
+dag2.addEdge("tail_bytes", "start_bytes");
+dag2.addEdge("tail_bytes", "dump_remainder");
+dag2.addEdge("tail_bytes", "pipe_bytes");
+dag2.addEdge("file_lines", "dump_remainder");
+dag2.addEdge("recheck", "pretty_name");
+dag2.sortingByDsf();