From 1fb8b8da418e25e4ecd60426b5fe1a84368b1fb1 Mon Sep 17 00:00:00 2001
From: Gianni Ceccarelli <gianni.ceccarelli@broadbean.com>
Date: Mon, 29 Jul 2019 17:32:35 +0100
Subject: half JS implementation

---
 js/mixed-server.js | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 js/mixed-server.js

(limited to 'js/mixed-server.js')

diff --git a/js/mixed-server.js b/js/mixed-server.js
new file mode 100644
index 0000000..3e103ed
--- /dev/null
+++ b/js/mixed-server.js
@@ -0,0 +1,86 @@
+'use strict';
+
+class Model {
+    constructor() {
+        this.words = new Map();
+    }
+
+    add_words(words) {
+        for (let word of words) {
+            this.words.set(word,1+(this.words.get(word) || 0));
+        }
+    }
+
+    get_most_common_pairs(how_many) {
+        let pairs = [...this.words];
+        pairs.sort((a,b) => { return b[1] - a[1] });
+        pairs.splice(how_many);
+        return pairs;
+    }
+};
+
+class View {
+    words_from_input(input) {
+        return input.split(/\s+/).filter(word => word.length > 0);
+    }
+
+    table_from_ranked_pairs(ranked_pairs) {
+        return ranked_pairs.map( pair => View.vsprintf('%-15s %3d',pair) ).join("\n");
+    }
+};
+View.vsprintf = require('sprintf-js').vsprintf;
+
+class HTTPController {
+    constructor(model,view) {
+        this.model = model;
+        this.view = view;
+    }
+
+    on_request(req,res) {
+        if (req.method == 'GET') {
+            this.get_words(req,res)
+        }
+        else if (req.method == 'POST') {
+            this.post_words(req,res)
+        }
+    }
+
+    respond(res,text) {
+        res.setHeader('Content-type','text/plain');
+        res.statusCode = 200;
+        res.write(`${text}\n`,'',() => { res.end() });
+    }
+    
+    get_words(req,res) {
+        const query = HTTPController.url_parse(req.url,true).query;
+        const how_many = query.n || 10;
+        const most_common_pairs = this.model.get_most_common_pairs(how_many);
+        const table = this.view.table_from_ranked_pairs(most_common_pairs);
+
+        this.respond(res,table);
+    }
+
+    post_words(req,res) {
+        let buffer = '';
+        req.on('data', (chunk) => {
+            buffer += chunk;
+        });
+        req.on('end', () => {
+            const words = this.view.words_from_input(buffer);
+            this.model.add_words(words);
+            this.respond(res,'ok');
+        })
+    }
+}
+HTTPController.url_parse = require('url').parse;
+
+const model = new Model();
+const view = new View();
+
+const http = require('http');
+const httpcontroller = new HTTPController(model,view);
+const httpserver = http.createServer((req,res) => {
+    httpcontroller.on_request(req,res);
+});
+
+httpserver.listen(8080,'localhost');
-- 
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