refactor(lodash): replace usage of snakeCase (#321)

Author: redgeoff

src/icon.js

@@ -1,6 +1,6 @@
 import React from 'react';
 import IconMui from '@material-ui/core/Icon';
-import snakeCase from 'lodash/snakeCase';
+import utils from './utils';
 
 // Note: we use font icons instead of SVG icons as this allows us to support any icon dynamically
 // without adding all icons to the JS bundle. The MaterialUI icons are about 54KB which is
@@ -15,10 +15,10 @@ export default class Icon extends React.PureComponent {
     }
   };
 
-  // Convert to the font icon name so that we can use the SVG Icon names. This allows us to make
-  // changes to this logic without changing the calling code.
+  // Convert to the font icon name so that we can use the SVG Icon names in the MSON. This allows us
+  // switch between font and SVG icons without changing the MSON definitions.
   toFontIconName(svgIconName) {
-    return snakeCase(svgIconName);
+    return utils.snakeCase(svgIconName);
   }
 
   render() {

src/utils.js

@@ -9,5 +9,16 @@ class Utils {
     });
     return definedProps;
   }
+
+  snakeCase(str) {
+    // 1. Make the first letter lower case so that we don't prepend an underscore in step 2
+    const a = str.charAt(0).toLowerCase() + str.slice(1);
+
+    // 2. Convert all caps to lower case and prepend an underscore in all cases, except the first.
+    const b = a.replace(/([A-Z])/g, (match) => '_' + match.toLowerCase());
+
+    // 3. Convert any sequence of non-alphanumeric characters to a single underscore
+    return b.replace(/[^a-z0-9]+/, '_');
+  }
 }
 export default new Utils();

src/utils.test.js

@@ -0,0 +1,8 @@
+import utils from './utils';
+
+it('should convert to snake case', () => {
+  expect(utils.snakeCase('Foo Bar')).toEqual('foo_bar');
+  expect(utils.snakeCase('fooBar')).toEqual('foo_bar');
+  expect(utils.snakeCase('FooBar')).toEqual('foo_bar');
+  expect(utils.snakeCase('Foo   Bar')).toEqual('foo_bar');
+});