Added var declaration in Netscript 1.0. Loops and conditionals no longer incur RAM cost, but base RAM cost increased from 1.4 to 1.6 GB

src/Constants.js

@@ -42,11 +42,11 @@ let CONSTANTS = {
 
     /* Netscript Constants */
     //RAM Costs for different commands
-    ScriptBaseRamCost:              1.4,
+    ScriptBaseRamCost:              1.6,
     ScriptDomRamCost:               100,
-    ScriptWhileRamCost:             0.2,
+    ScriptWhileRamCost:             0,
-    ScriptForRamCost:               0.2,
+    ScriptForRamCost:               0,
-    ScriptIfRamCost:                0.15,
+    ScriptIfRamCost:                0,
     ScriptHackRamCost:              0.1,
     ScriptGrowRamCost:              0.15,
     ScriptWeakenRamCost:            0.15,
@@ -490,17 +490,15 @@ let CONSTANTS = {
 
     LatestUpdate:
     "v0.38.1<br>"  +
-    "* Bug Fix: Using 'Object.prototype' functions like toLocaleString() or toString() should no longer cause errors in NetscriptJS<br>" +
+    "* Added 'var' declarations in Netscript 1.0 (only works with 'var', not 'let' or 'const')<br>"  +
-    "* Implemented by Github user hydroflame:<br>"  +
+    "* Script base RAM cost is now 1.6 GB (increased from 1.4 GB)<br>" +
-    "*** Accessing the 'window' and 'document' objects in Netscript JS now requires a large amount of RAM (100 GB)<br>" +
+    "* While/for loops and if statements no longer cost RAM in scripts<br>"  +
-    "*** Added game option to suppress travel confirmation<br>"  +
+    "* Made short-circuit evaluation logic more consistent in Netscript 1.0 (see https://github.com/danielyxie/bitburner/issues/308)<br>" +
-    "*** Text on buttons can no longer be highlighted<br>" +
+    "* Changelog button in the Options menu now links to the new Changelog URL (by Github user thePalindrome)<br>" +
-    "*** Bug Fix: Fixed an issue that caused NaN values when exporting Real Estate in Corporations<br>" +
+    "* Skill level calculation is now 'smoother' (by Github user hydroflame)<br>" +
-    "*** Bug Fix: Competition and Demand displays in Corporation are now correct (were reversed before)<br>" +
+    "* Added a button to 'beautify' scripts in the text editor (by Github user hydroflame)<br>" +
-    "*** Added ps() Netscript function<br>"  +
+    "* Added favicon (by Github user kopelli)"
-    "*** Bug Fix: grow() should no longer return/log a negative value when it runs on a server that's already at max money<br>" +
+
-    "*** Bug Fix: serverExists() Netscript function should now properly return false for non-existent hostname/ips<br>" +
-    "*** Bug Fix: Sever's security level should now properly increase when its money is grown to max value"
 
 }
 

src/NetscriptEvaluator.js

@@ -224,6 +224,9 @@ function evaluate(exp, workerScript) {
             case "AssignmentExpression":
                 return evalAssignment(exp, workerScript);
                 break;
+            case "VariableDeclaration":
+                return evalVariableDeclaration(exp, workerScript);
+                break;
             case "UpdateExpression":
                 if (exp.argument.type==="Identifier"){
                     if (exp.argument.name in env.vars){
@@ -333,11 +336,11 @@ function evaluate(exp, workerScript) {
 function evalBinary(exp, workerScript){
     return evaluate(exp.left, workerScript).then(function(expLeft) {
         //Short circuiting
-        if (expLeft == true && exp.operator === "||") {
+        if (expLeft && exp.operator === "||") {
-            return Promise.resolve(true);
+            return Promise.resolve(expLeft);
         }
-        if (expLeft == false && exp.operator === "&&") {
+        if (!expLeft && exp.operator === "&&") {
-            return Promise.resolve(false);
+            return Promise.resolve(expLeft);
         }
         return evaluate(exp.right, workerScript).then(function(expRight) {
             switch (exp.operator){
@@ -511,6 +514,41 @@ function evalAssignment(exp, workerScript) {
     });
 }
 
+function evalVariableDeclaration(exp, workerScript) {
+    var env = workerScript.env;
+    if (env.stopFlag) {return Promise.reject(workerScript);}
+
+    if (!(exp.declarations instanceof Array)) {
+        return Promise.reject(makeRuntimeRejectMsg(workerScript, "Variable declarations parsed incorrectly. This may be a syntax error"));
+    }
+
+    if (exp.kind !== "var") {
+        return Promise.reject(makeRuntimeRejectMsg(workerScript, "Only 'var' declarations are currently allowed (let, const, etc. are not allowed)"));
+    }
+
+    return Promise.all(exp.declarations.map((decl)=>{
+        evalVariableDeclarator(decl, workerScript);
+    })).then(function(res) {
+        return Promise.resolve(res);
+    });
+}
+
+//A Variable Declaration contains an array of Variable Declarators
+function evalVariableDeclarator(exp, workerScript) {
+    var env = workerScript.env;
+    if (exp.type !== "VariableDeclarator") {
+        return Promise.reject(makeRuntimeRejectMsg(workerScript, "Invalid AST Node passed into evalVariableDeclarator: " + exp.type));
+    }
+    if (exp.init == null) {
+        env.set(exp.id.name, null);
+        return Promise.resolve(null);
+    } else {
+        return evaluate(exp.init, workerScript).then(function(initValue) {
+            env.set(exp.id.name, initValue);
+        });
+    }
+}
+
 function evaluateIf(exp, workerScript, i) {
     var env = workerScript.env;
     return evaluate(exp.test, workerScript).then(function(condRes) {

src/NetscriptWorker.js

@@ -194,7 +194,7 @@ function runScriptsLoop() {
             } else {
                 try {
                     var ast = parse(workerScripts[i].code, {sourceType:"module"});
-                    //console.log(ast);
+                    console.log(ast);
                 } catch (e) {
                     console.log("Error parsing script: " + workerScripts[i].name);
                     dialogBoxCreate("Syntax ERROR in " + workerScripts[i].name + ":<br>" +  e);

src/Script.js

@@ -60,7 +60,7 @@ function scriptEditorInit() {
     }
     var beautifyButton = createElement("a", {
         class:"a-link-button", display:"inline-block",
-        innerText:"beautify",
+        innerText:"Beautify",
         clickListener:()=>{
             beautifyScript();
             return false;