FEAT: add ac_automata_unicode by JS

javascript/36_ac_automata/ac_automata_unicode.js

@@ -0,0 +1,109 @@
+
+class ACNode {
+    constructor(data){
+        this.data = data;
+        this.children = new Map();
+        this.isEndingChar = false;
+        this.length = 0;
+        this.fail = null;
+    }
+}
+
+class ACTree {
+
+    constructor(data){
+        this.root = new ACNode('/')
+    }
+
+    insert (text) {
+        let node = this.root;
+        for (let char of text) {
+            if(!node.children.get(char)) {
+                node.children.set(char, new ACNode(char));
+            }
+            node = node.children.get(char);
+        }
+
+        node.isEndingChar = true;
+        node.length = text.length;
+    }
+
+    buildFailurePointer() {
+        let root = this.root;
+        let queue = [];
+        queue.push(root);
+
+        while (queue.length > 0) {
+            let p = queue.shift();
+
+            for(var pc of p.children.values()){
+                if (!pc) {
+                    continue;
+                } 
+
+                if(p == root) {
+                    pc.fail = root;
+                } else {
+                    let q = p.fail;
+                    while (q) {
+                        let qc = q.children.get(pc.data);
+                        if(qc) {
+                            pc.fail = qc;
+                            break;
+                        }
+                        q = q.fail;
+                    }
+                    if(!q) {
+                        pc.fail = root;
+                    }
+                }
+                queue.push(pc);
+            }
+        }
+    }
+
+    match (text) {
+        let root = this.root;
+        let n = text.length;
+        let p = root;
+
+        for(let i = 0; i < n; i++) {
+            let char = text[i];
+            while(!p.children.get(char) && p != root){
+                p = p.fail;
+            }
+
+            p = p.children.get(char);
+            if(!p) {
+                p = root;
+            }
+
+            let tmp = p;
+            while ( tmp != root) {
+                if (tmp.isEndingChar == true) {
+                    console.log(`Start from ${i - p.length + 1}, length: ${p.length}`);
+                }
+                tmp = tmp.fail;
+            }
+        }
+    }
+}
+
+function match( text, patterns) {
+    let automata = new ACTree();
+    for (let pattern of patterns) {
+        automata.insert(pattern);
+    }
+
+    automata.buildFailurePointer();
+    automata.match(text);
+}
+
+let patterns = ["at", "art", "oars", "soar"];
+let text = "soarsoars";
+match(text, patterns);
+
+let patterns2 = ["Fxtec Pro1", "谷歌Pixel"];
+let text2 = "一家总部位于伦敦的公司Fxtex在MWC上就推出了一款名为Fxtec Pro1的手机，该机最大的亮点就是采用了侧滑式全键盘设计。DxOMark年度总榜发布 华为P20 Pro/谷歌Pixel 3争冠";
+match(text2, patterns2);
+