Started error handling

src/blocks/affineDecrypt.js

@@ -9,15 +9,15 @@ module.exports =  {
     },
     a: {
       name: "a",
-      type: "text",
+      type: "number",
       required: true,
-      inline: false
+      inline: true
     },
     b: {
       name: "b",
-      type: "text",
+      type: "number",
       required: true,
-      inline: false
+      inline: true
     }
   },
   output: true,
@@ -33,7 +33,7 @@ module.exports =  {
     }
 
     if(!require("./util/coPrime.js")(a, 26)){
-      console.log(a, 26, "not coprime");
+      throw "a and 26 must be coprime";
       return "";
     }
 

src/outputCalculation.js

@@ -3,7 +3,9 @@ var events = require("./events.js");
 var blocks = require("./blocks");
 
 function resolveOutput(block, cache){
+  try{
     var inputValues = {};
+    var error = "";
     for(var input in block.inputs){
       if(block.inputs[input].joined){ //if it's joined to something else
         if(block.inputs[input].joined in cache){ //if output of other block is already in cache
@@ -17,13 +19,20 @@ function resolveOutput(block, cache){
       else if(block.inputs[input].value){ //if value is already set, just save that
         inputValues[input] = block.inputs[input].value;
       }
+      if(blocks[block.type].inputs[input].required && !(inputValues[input])){ //if input is required and is missing
+        throw "A required input is missing";
+      }
     }
 
     var output = blocks[block.type].execute(inputValues, block);
     cache[block.id] = output;
-
     return output;
   }
+  catch(err){
+    console.log("ERROR", err);
+    return "";
+  }
+}
 
 function calculateOutputBlocks(){
   var cache = {};