make is-valid colorscale array more strict

Author: etpinard

src/components/colorscale/is_valid_scale_array.js

@@ -14,20 +14,24 @@ var tinycolor = require('tinycolor2');
 
 module.exports = function isValidScaleArray(scl) {
     var isValid = true,
-        highestVal = 0,
-        si;
-
-    if(!Array.isArray(scl)) return false;
-    else {
-        if(+scl[0][0] !== 0 || +scl[scl.length - 1][0] !== 1) return false;
-        for(var i = 0; i < scl.length; i++) {
-            si = scl[i];
-            if(si.length !== 2 || +si[0] < highestVal || !tinycolor(si[1]).isValid()) {
-                isValid = false;
-                break;
-            }
-            highestVal = +si[0];
+        highestVal = 0;
+
+    if(!Array.isArray(scl) || scl.length === 0) return false;
+
+    if(!scl[0] || !scl[scl.length - 1]) return false;
+
+    if(+scl[0][0] !== 0 || +scl[scl.length - 1][0] !== 1) return false;
+
+    for(var i = 0; i < scl.length; i++) {
+        var si = scl[i];
+
+        if(si.length !== 2 || +si[0] < highestVal || !tinycolor(si[1]).isValid()) {
+            isValid = false;
+            break;
         }
-        return isValid;
+
+        highestVal = +si[0];
     }
+
+    return isValid;
 };

test/jasmine/tests/colorscale_test.js

@@ -20,6 +20,13 @@ describe('Test colorscale:', function() {
 
         it('should accept only array of 2-item arrays', function() {
             expect(isValidScale('a')).toBe(false);
+            expect(isValidScale([])).toBe(false);
+            expect(isValidScale([null, undefined])).toBe(false);
+            expect(isValidScale([{}, [1, 'rgb(0, 0, 200']])).toBe(false);
+            expect(isValidScale([[0, 'rgb(200, 0, 0)'], {}])).toBe(false);
+            expect(isValidScale([[0, 'rgb(0, 0, 200)'], undefined])).toBe(false);
+            expect(isValidScale([null, [1, 'rgb(0, 0, 200)']])).toBe(false);
+            expect(isValidScale(['a', 'b'])).toBe(false);
             expect(isValidScale(['a'])).toBe(false);
             expect(isValidScale([['a'], ['b']])).toBe(false);
 

test/jasmine/tests/lib_test.js

@@ -905,8 +905,6 @@ describe('Test lib.js:', function() {
                 bad3 = [ ['red'], ['blue']],
                 bad4 = ['red', 'blue'];
 
-            // Fails at [], should be an easy fix though.
-
             var shouldPass = ['Viridis', 'Greens', good],
                 shouldFail = ['red', 1, undefined, null, {}, [], bad, bad2, bad3, bad4];