added web editor to subfolder of frontend

frontend/web-editor/src/repl.js

@@ -0,0 +1,27 @@
+const log = require('./editor/log.js').log
+
+module.exports = {
+  eval: (arg, callback) => {
+    var self = this
+
+    // wrap everything in an async function
+  var jsString = `(async() => {
+    ${arg}
+})().catch(${(err) => log(err.message, "log-error")})`
+    var isError = false
+    try {
+      eval(jsString)
+      // log(jsString)
+      log('')
+    } catch (e) {
+      isError = true
+      console.log("logging", e)
+      // var err = e.constructor('Error in Evaled Script: ' + e.message);
+      // console.log(err.lineNumber)
+      log(e.message, "log-error")
+      //console.log('ERROR', JSON.stringify(e))
+    }
+  //  console.log('callback is', callback)
+    if(callback) callback(jsString, isError)
+  }
+}