Initial commit

rangevote.js

@@ -0,0 +1,141 @@
+var express = require('express')
+var bodyParser = require('body-parser')
+var fs=require('fs')
+
+var app = express()
+
+
+var Candidates=[ "Chris Christie", "Ron DeSantis", "Nikki Haley", "Mike Pence",
+		 "Vivek Ramaswamy", "Tim Scott", "Donald Trump" ];
+
+function CanId(c)
+{
+    let w=c.split(" ");
+    let lastname=w[w.length-1].toLowerCase();
+    let id=lastname.split("-");
+    let rval=id[id.length-1];
+    return(rval);
+}
+
+// Set up data structures for Range Votes and Plur Votes
+var RangeVotes=new Map();
+var RangePower=new Map();
+var RangeResult=new Map();
+var PlurVotes=new Map();
+var PlurResult=new Map();
+for (let c of Candidates)
+{
+    let k=CanId(c);
+    let v=RangePower.get(k);
+    if (typeof(v)!='number' || v==NaN || v==Infinity) RangePower.set(k,0);
+    v=RangeResult.get(k);
+    if (typeof(v)!='number' || v==NaN || v==Infinity) RangeResult.set(k,0);
+    v=PlurResult.get(k);
+    if (typeof(v)!='number' || v==NaN || v==Infinity) PlurResult.set(k,0);
+}
+
+
+
+// Construct the static page for range voting
+var TheHTML="";
+for (let c of Candidates)
+{
+    TheHTML=TheHTML+'      <tr>'+
+	'          <td>'+c+'</td><td><input type="range" min="-1" max="100" value="-1" id="i-'+CanId(c)+'" name="n-'+CanId(c)+'" /></td><td><span id="o-'+CanId(c)+'">No Opinion</span></td></tr>\n';
+}
+var TemplateHTML=fs.readFileSync("rangevote.html").toString();
+var TemplateSearch="<!-- INJECT0 -->";
+var TemplateIndex=TemplateHTML.indexOf(TemplateSearch);
+TheHTML=TemplateHTML.substr(0,TemplateIndex)+TheHTML+TemplateHTML.substr(TemplateIndex+TemplateSearch.length,1000000);
+
+
+// create application/json parser
+var jsonParser = bodyParser.json()
+
+// create application/x-www-form-urlencoded parser
+var urlencodedParser = bodyParser.urlencoded({ extended: false })
+
+app.get('/', (req, res) => {
+    res.send(TheHTML);
+})
+
+function lerp(a,b,c,d,e)
+{
+    if (a<b) a=b;
+    if (a>c) a=c;
+    let rval=d+(a-b)*(e-d)/(c-b);
+    return(rval);
+}
+
+function PlurVote(ip,NewChoice)
+{
+    let OldChoice=PlurResult.get(ip);
+    if (typeof(OldChoice)=='string') PlurResult.set(OldChoice,PlurResult.get(OldChoice)-1);
+    if (typeof(NewChoice)=='string') PlurResult.set(NewChoice,PlurResult.get(NewChoice)+1);
+}
+
+
+function AddToRangeResult(vote,mult=1)
+{
+    console.log("RangeResult Before "+mult);
+    console.log(RangeResult);
+    console.log("RangePower Before "+mult);
+    console.log(RangePower);
+    for (let[key,val] of vote) if (key) if (val>=0)
+    {
+	RangeResult.set(key,RangeResult.get(key)+val*mult);
+	RangePower.set(key,RangePower.get(key)+mult);
+    }
+    console.log("RangeResult After "+mult);
+    console.log(RangeResult);
+    console.log("RangePower After "+mult);
+    console.log(RangePower);
+}
+
+
+function RangeVote(ip,entries)
+{
+    let r0=null,r1=null;
+    for (let [key,val] of entries) if (typeof(key)=="string" && val>=0)
+    {
+	if (r0) r0=Math.min(r0,val); else r0=val;
+	if (r1) r1=Math.max(r1,val); else r1=val;
+    }
+    if (r1<=r0) return;
+    let NewVote=new Map()
+    for (let [key,val] of entries) if (typeof(key)=="string")
+    {
+	let id=CanId(key);
+	console.log(key+' '+id);
+	let norm=Math.round(lerp(val,r0,r1,0,100));
+	if (val>=0) NewVote.set(id,norm);
+    }
+    let OldVote=RangeVotes.get(ip);
+//    if (OldVote) AddToRangeResult(OldVote,-1);
+    console.log("NewVote");
+    console.log(NewVote);
+    RangeVotes.set(ip,NewVote);
+    AddToRangeResult(NewVote,1);
+}
+
+
+// POST /login gets urlencoded bodies
+app.post('/range_vote', urlencodedParser, function (req, res) {
+    RangeVote(req.socket.remoteAddress,Object.entries(req.body));
+    let str="Results:<br>";
+    for (let c of Candidates)
+    {
+	let key=CanId(c);
+	if (RangePower.get(key)>0) str=str+c+': '+Math.round(RangeResult.get(key)/RangePower.get(key))+'<br>';
+    }
+    res.send(str);
+})
+
+app.post('/plur_vote', urlencodedParser, function (req, res) {
+//    PlurVote(req.socket.remoteAddress,Object.entries(req.body));
+    res.send("Your Plurality Vote Counted!!!");
+})
+
+
+app.listen(3000,function(req,res) { console.log("Listening for connections"); })
+