Update dashedToCamelCase

Author: asamuzaK

lib/parsers.js

@@ -410,11 +410,15 @@ exports.parseImage = function parseImage(val) {
 };
 
 // utility to translate from border-width to borderWidth
-var dashedToCamelCase = function (dashed) {
-  var i;
+exports.dashedToCamelCase = function (dashed) {
+  if (dashed.startsWith('--')) {
+    return dashed;
+  }
+  // skip leading hyphen in vendor prefixed value, e.g. -webkit-foo
+  var i = /^\-[a-z]/.test(dashed) ? 1 : 0;
   var camel = '';
   var nextCap = false;
-  for (i = 0; i < dashed.length; i++) {
+  for (; i < dashed.length; i++) {
     if (dashed[i] !== '-') {
       camel += nextCap ? dashed[i].toUpperCase() : dashed[i];
       nextCap = false;
@@ -424,7 +428,6 @@ var dashedToCamelCase = function (dashed) {
   }
   return camel;
 };
-exports.dashedToCamelCase = dashedToCamelCase;
 
 var isSpace = /\s/;
 var openingDeliminators = ['"', "'", '('];
@@ -525,7 +528,7 @@ exports.shorthandSetter = function (property, shorthandFor) {
     Object.keys(obj).forEach(function (subprop) {
       // in case subprop is an implicit property, this will clear
       // *its* subpropertiesX
-      var camel = dashedToCamelCase(subprop);
+      var camel = exports.dashedToCamelCase(subprop);
       this[camel] = obj[subprop];
       // in case it gets translated into something else (0 -> 0px)
       obj[subprop] = this[camel];

test/parsers.js

@@ -900,9 +900,37 @@ describe('parseImage', () => {
 
   it.todo('test');
 });
+
 describe('dashedToCamelCase', () => {
-  it.todo('test');
+  it('should not camelize custom property', () => {
+    let input = '--foo-bar-baz';
+    let output = parsers.dashedToCamelCase(input);
+
+    assert.strictEqual(output, '--foo-bar-baz');
+  });
+
+  it('should camelize value', () => {
+    let input = 'foo-bar-baz';
+    let output = parsers.dashedToCamelCase(input);
+
+    assert.strictEqual(output, 'fooBarBaz');
+  });
+
+  it('should camelize vendor prefixed value', () => {
+    let input = '-webkit-foo';
+    let output = parsers.dashedToCamelCase(input);
+
+    assert.strictEqual(output, 'webkitFoo');
+  });
+
+  it('should not camelize snake cased value', () => {
+    let input = 'foo_bar_baz';
+    let output = parsers.dashedToCamelCase(input);
+
+    assert.strictEqual(output, 'foo_bar_baz');
+  });
 });
+
 describe('shorthandParser', () => {
   it.todo('test');
 });