Add OperationError error type and use for errors to be printed to the output panel

.babelrc

@@ -10,5 +10,10 @@
             "modules": false,
             "useBuiltIns": true
         }]
+    ],
+    "plugins": [
+        ["babel-plugin-transform-builtin-extend", {
+            "globals": ["Error"]
+        }]
     ]
 }

package-lock.json

@@ -228,14 +228,12 @@
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
-      "dev": true
     },
     "ansi-styles": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4="
-      "dev": true
     },
     "anymatch": {
       "version": "2.0.0",
@@ -471,7 +469,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
       "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
-      "dev": true,
       "requires": {
         "chalk": "1.1.3",
         "esutils": "2.0.2",
@@ -681,7 +678,6 @@
       "version": "6.23.0",
       "resolved": "https://registry.npmjs.org/babel-messages/-/babel-messages-6.23.0.tgz",
       "integrity": "sha1-8830cDhYA1sqKVHG7F7fbGLyYw4=",
-      "dev": true,
       "requires": {
         "babel-runtime": "6.26.0"
       }
@@ -724,6 +720,15 @@
         "babel-runtime": "6.26.0"
       }
     },
+    "babel-plugin-transform-builtin-extend": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-builtin-extend/-/babel-plugin-transform-builtin-extend-1.1.2.tgz",
+      "integrity": "sha1-Xpb+z1i4+h7XTvytiEdbKvPJEW4=",
+      "requires": {
+        "babel-runtime": "6.26.0",
+        "babel-template": "6.26.0"
+      }
+    },
     "babel-plugin-transform-es2015-arrow-functions": {
       "version": "6.22.0",
       "resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-arrow-functions/-/babel-plugin-transform-es2015-arrow-functions-6.22.0.tgz",
@@ -1071,7 +1076,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-template/-/babel-template-6.26.0.tgz",
       "integrity": "sha1-3gPi0WOWsGn0bdn/+FIfsaDjXgI=",
-      "dev": true,
       "requires": {
         "babel-runtime": "6.26.0",
         "babel-traverse": "6.26.0",
@@ -1084,7 +1088,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.26.0.tgz",
       "integrity": "sha1-RqnL1+3MYsjlwGTi0tjQ9ANXZu4=",
-      "dev": true,
       "requires": {
         "babel-code-frame": "6.26.0",
         "babel-messages": "6.23.0",
@@ -1101,7 +1104,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
       "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
-      "dev": true,
       "requires": {
         "babel-runtime": "6.26.0",
         "esutils": "2.0.2",
@@ -1112,8 +1114,7 @@
     "babylon": {
       "version": "6.18.0",
       "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
-      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
+      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ=="
-      "dev": true
     },
     "balanced-match": {
       "version": "1.0.0",
@@ -1674,7 +1675,6 @@
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
       "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-      "dev": true,
       "requires": {
         "ansi-styles": "2.2.1",
         "escape-string-regexp": "1.0.5",
@@ -2505,7 +2505,6 @@
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
       "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-      "dev": true,
       "requires": {
         "ms": "2.0.0"
       }
@@ -2934,8 +2933,7 @@
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
+      "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
-      "dev": true
     },
     "escodegen": {
       "version": "1.9.1",
@@ -5178,8 +5176,7 @@
     "globals": {
       "version": "9.18.0",
       "resolved": "https://registry.npmjs.org/globals/-/globals-9.18.0.tgz",
-      "integrity": "sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ==",
+      "integrity": "sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ=="
-      "dev": true
     },
     "globby": {
       "version": "5.0.0",
@@ -5598,7 +5595,6 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/has-ansi/-/has-ansi-2.0.0.tgz",
       "integrity": "sha1-NPUEnOHs3ysGSa8+8k5F7TVBbZE=",
-      "dev": true,
       "requires": {
         "ansi-regex": "2.1.1"
       }
@@ -6329,7 +6325,6 @@
       "version": "2.2.3",
       "resolved": "https://registry.npmjs.org/invariant/-/invariant-2.2.3.tgz",
       "integrity": "sha512-7Z5PPegwDTyjbaeCnV0efcyS6vdKAU51kpEmS7QFib3P4822l8ICYyMn7qvJnc+WzLoDsuI9gPMKbJ8pCu8XtA==",
-      "dev": true,
       "requires": {
         "loose-envify": "1.3.1"
       }
@@ -6747,8 +6742,7 @@
     "js-tokens": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-3.0.2.tgz",
-      "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls=",
+      "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls="
-      "dev": true
     },
     "js-yaml": {
       "version": "3.7.0",
@@ -7459,7 +7453,6 @@
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.3.1.tgz",
       "integrity": "sha1-0aitM/qc4OcT1l/dCsi3SNR4yEg=",
-      "dev": true,
       "requires": {
         "js-tokens": "3.0.2"
       }
@@ -7855,8 +7848,7 @@
     "ms": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
-      "dev": true
     },
     "multicast-dns": {
       "version": "6.2.3",
@@ -11251,7 +11243,6 @@
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-      "dev": true,
       "requires": {
         "ansi-regex": "2.1.1"
       }
@@ -11322,8 +11313,7 @@
     "supports-color": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc="
-      "dev": true
     },
     "svgo": {
       "version": "0.7.2",
@@ -11537,8 +11527,7 @@
     "to-fast-properties": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
-      "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
+      "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc="
-      "dev": true
     },
     "to-object-path": {
       "version": "0.3.0",

package.json

@@ -68,6 +68,7 @@
   },
   "dependencies": {
     "babel-polyfill": "^6.26.0",
+    "babel-plugin-transform-builtin-extend": "1.1.2",
     "bcryptjs": "^2.4.3",
     "bignumber.js": "^6.0.0",
     "bootstrap": "^3.3.7",

src/core/Recipe.mjs

@@ -8,6 +8,7 @@
 import OpModules from "./config/modules/OpModules";
 import OperationConfig from "./config/OperationConfig.json";
 import log from "loglevel";
+import OperationError from "./errors/OperationError";
 
 /**
  * The Recipe controls a list of Operations and the Dish they operate on.
@@ -175,6 +176,11 @@ class Recipe  {
                     dish.set(output, op.outputType);
                 }
             } catch (err) {
+                // print expected errors in output pane
+                if (err instanceof OperationError) {
+                    dish.set(err.message, "string");
+                    return i;
+                } else {
                     const e = typeof err == "string" ? { message: err } : err;
 
                     e.progress = i;
@@ -189,6 +195,7 @@ class Recipe  {
                     throw e;
                 }
             }
+        }
 
         log.debug("Recipe complete");
         return this.opList.length;

src/core/errors/OperationError.mjs

@@ -0,0 +1,20 @@
+/**
+ * Create custom error type for handling operation input errors.
+ * i.e. where the operation can handle the error and print a
+ * message to the screen.
+ */
+class OperationError extends Error {
+    /**
+     * Standard error constructor. Adds no new behaviour.
+     * @param args standard error args
+     */
+    constructor(...args) {
+        super(...args);
+
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, OperationError);
+        }
+    }
+}
+
+export default OperationError;

src/core/operations/CartesianProduct.mjs

@@ -5,6 +5,7 @@
  */
 
 import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
 
 /**
  * Set cartesian product operation
@@ -44,7 +45,8 @@ class CartesianProduct extends Operation {
      */
     validateSampleNumbers(sets) {
         if (!sets || sets.length < 2) {
-            throw "Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?";
+            throw new OperationError("Incorrect number of sets, perhaps you" +
+                " need to modify the sample delimiter or add more samples?");
         }
     }
 
@@ -54,16 +56,13 @@ class CartesianProduct extends Operation {
      * @param {string} input
      * @param {Object[]} args
      * @returns {string}
+     * @throws {OperationError}
      */
     run(input, args) {
         [this.sampleDelim, this.itemDelimiter] = args;
         const sets = input.split(this.sampleDelim);
 
-        try {
         this.validateSampleNumbers(sets);
-        } catch (e) {
-            return e;
-        }
 
         return this.runCartesianProduct(...sets.map(s => s.split(this.itemDelimiter)));
     }

src/core/operations/SetDifference.mjs

@@ -5,6 +5,7 @@
  */
 
 import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
 
 /**
  * Set Difference operation
@@ -44,7 +45,7 @@ class SetDifference extends Operation {
      */
     validateSampleNumbers(sets) {
         if (!sets || (sets.length !== 2)) {
-            throw "Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?";
+            throw new OperationError("Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?");
         }
     }
 
@@ -54,16 +55,13 @@ class SetDifference extends Operation {
      * @param {string} input
      * @param {Object[]} args
      * @returns {string}
+     * @throws {OperationError}
      */
     run(input, args) {
         [this.sampleDelim, this.itemDelimiter] = args;
         const sets = input.split(this.sampleDelim);
 
-        try {
         this.validateSampleNumbers(sets);
-        } catch (e) {
-            return e;
-        }
 
         return this.runSetDifference(...sets.map(s => s.split(this.itemDelimiter)));
     }

src/core/operations/SetIntersection.mjs

@@ -5,6 +5,7 @@
  */
 
 import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
 
 /**
  * Set Intersection operation
@@ -44,7 +45,7 @@ class SetIntersection extends Operation {
      */
     validateSampleNumbers(sets) {
         if (!sets || (sets.length !== 2)) {
-            throw "Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?";
+            throw new OperationError("Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?");
         }
     }
 
@@ -54,16 +55,13 @@ class SetIntersection extends Operation {
      * @param {string} input
      * @param {Object[]} args
      * @returns {string}
+     * @throws {OperationError}
      */
     run(input, args) {
         [this.sampleDelim, this.itemDelimiter] = args;
         const sets = input.split(this.sampleDelim);
 
-        try {
         this.validateSampleNumbers(sets);
-        } catch (e) {
-            return e;
-        }
 
         return this.runIntersect(...sets.map(s => s.split(this.itemDelimiter)));
     }

src/core/operations/SetUnion.mjs

@@ -5,6 +5,7 @@
  */
 
 import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
 
 /**
  * Set Union operation
@@ -44,7 +45,7 @@ class SetUnion extends Operation {
      */
     validateSampleNumbers(sets) {
         if (!sets || (sets.length !== 2)) {
-            throw "Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?";
+            throw new OperationError("Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?");
         }
     }
 
@@ -54,16 +55,13 @@ class SetUnion extends Operation {
      * @param {string} input
      * @param {Object[]} args
      * @returns {string}
+     * @throws {OperationError}
      */
     run(input, args) {
         [this.sampleDelim, this.itemDelimiter] = args;
         const sets = input.split(this.sampleDelim);
 
-        try {
         this.validateSampleNumbers(sets);
-        } catch (e) {
-            return e;
-        }
 
         return this.runUnion(...sets.map(s => s.split(this.itemDelimiter)));
     }

src/core/operations/SymmetricDifference.mjs

@@ -6,6 +6,7 @@
 
 import Utils from "../Utils";
 import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
 
 /**
  * Set Symmetric Difference operation
@@ -45,7 +46,7 @@ class SymmetricDifference extends Operation {
      */
     validateSampleNumbers(sets) {
         if (!sets || (sets.length !== 2)) {
-            throw "Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?";
+            throw new OperationError("Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?");
         }
     }
 
@@ -55,16 +56,13 @@ class SymmetricDifference extends Operation {
      * @param {string} input
      * @param {Object[]} args
      * @returns {string}
+     * @throws {OperationError}
      */
     run(input, args) {
         [this.sampleDelim, this.itemDelimiter] = args;
         const sets = input.split(this.sampleDelim);
 
-        try {
         this.validateSampleNumbers(sets);
-        } catch (e) {
-            return e;
-        }
 
         return this.runSymmetricDifference(...sets.map(s => s.split(this.itemDelimiter)));
     }