Lodash: Refactor away from _.kebabCase() in block editor

packages/block-editor/src/components/colors/utils.js

@@ -1,11 +1,15 @@
 /**
  * External dependencies
  */
-import { kebabCase } from 'lodash';
 import { colord, extend } from 'colord';
 import namesPlugin from 'colord/plugins/names';
 import a11yPlugin from 'colord/plugins/a11y';
 
+/**
+ * Internal dependencies
+ */
+import { kebabCase } from '../../utils/object';
+
 extend( [ namesPlugin, a11yPlugin ] );
 
 /**

packages/block-editor/src/components/colors/with-colors.js

@@ -1,8 +1,3 @@
-/**
- * External dependencies
- */
-import { kebabCase } from 'lodash';
-
 /**
  * WordPress dependencies
  */
@@ -19,6 +14,7 @@ import {
 	getMostReadableColor,
 } from './utils';
 import useSetting from '../use-setting';
+import { kebabCase } from '../../utils/object';
 
 /**
  * Capitalizes the first letter in a string.

packages/block-editor/src/components/font-sizes/utils.js

@@ -1,7 +1,7 @@
 /**
- * External dependencies
+ * Internal dependencies
  */
-import { kebabCase } from 'lodash';
+import { kebabCase } from '../../utils/object';
 
 /**
  *  Returns the font size object based on an array of named font sizes and the namedFontSize and customFontSize values.

packages/block-editor/src/components/global-styles/use-global-styles-output.js

@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import { get, kebabCase, set } from 'lodash';
+import { get, set } from 'lodash';
 
 /**
  * WordPress dependencies
@@ -32,6 +32,7 @@ import { PresetDuotoneFilter } from '../duotone/components';
 import { getGapCSSValue } from '../../hooks/gap';
 import { store as blockEditorStore } from '../../store';
 import { LAYOUT_DEFINITIONS } from '../../layouts/definitions';
+import { kebabCase } from '../../utils/object';
 
 // List of block support features that can have their related styles
 // generated under their own feature level selector rather than the block's.

packages/block-editor/src/hooks/font-family.js

@@ -1,8 +1,3 @@
-/**
- * External dependencies
- */
-import { kebabCase } from 'lodash';
-
 /**
  * WordPress dependencies
  */
@@ -15,6 +10,7 @@ import TokenList from '@wordpress/token-list';
  */
 import { shouldSkipSerialization } from './utils';
 import { TYPOGRAPHY_SUPPORT_KEY } from './typography';
+import { kebabCase } from '../utils/object';
 
 export const FONT_FAMILY_SUPPORT_KEY = 'typography.__experimentalFontFamily';
 

packages/block-editor/src/hooks/layout.js

@@ -2,7 +2,6 @@
  * External dependencies
  */
 import classnames from 'classnames';
-import { kebabCase } from 'lodash';
 
 /**
  * WordPress dependencies
@@ -31,6 +30,7 @@ import BlockList from '../components/block-list';
 import { getLayoutType, getLayoutTypes } from '../layouts';
 import { useBlockEditingMode } from '../components/block-editing-mode';
 import { LAYOUT_DEFINITIONS } from '../layouts/definitions';
+import { kebabCase } from '../utils/object';
 
 const layoutBlockSupportKey = 'layout';
 

packages/block-editor/src/hooks/use-typography-props.js

@@ -1,7 +1,6 @@
 /**
  * External dependencies
  */
-import { kebabCase } from 'lodash';
 import classnames from 'classnames';
 
 /**
@@ -13,6 +12,7 @@ import {
 	getTypographyFontSizeValue,
 	getFluidTypographyOptionsFromSettings,
 } from '../components/global-styles/typography-utils';
+import { kebabCase } from '../utils/object';
 
 /*
  * This utility is intended to assist where the serialization of the typography

packages/block-editor/src/utils/object.js

@@ -1,3 +1,8 @@
+/**
+ * External dependencies
+ */
+import { paramCase } from 'change-case';
+
 /**
  * Converts a path to an array of its fragments.
  * Supports strings, numbers and arrays:
@@ -19,6 +24,36 @@ function normalizePath( path ) {
 	return [ path ];
 }
 
+/**
+ * Converts any string to kebab case.
+ * Backwards compatible with Lodash's `_.kebabCase()`.
+ * Backwards compatible with `_wp_to_kebab_case()`.
+ *
+ * @see https://lodash.com/docs/4.17.15#kebabCase
+ * @see https://developer.wordpress.org/reference/functions/_wp_to_kebab_case/
+ *
+ * @param {string} str String to convert.
+ * @return {string} Kebab-cased string
+ */
+export function kebabCase( str ) {
+	let input = str;
+	if ( typeof str !== 'string' ) {
+		input = str?.toString?.() ?? '';
+	}
+
+	// See https://github.com/lodash/lodash/blob/b185fcee26b2133bd071f4aaca14b455c2ed1008/lodash.js#L4970
+	input = input.replace( /['\u2019]/, '' );
+
+	return paramCase( input, {
+		splitRegexp: [
+			/(?!(?:1ST|2ND|3RD|[4-9]TH)(?![a-z]))([a-z0-9])([A-Z])/g, // fooBar => foo-bar, 3Bar => 3-bar
+			/(?!(?:1st|2nd|3rd|[4-9]th)(?![a-z]))([0-9])([a-z])/g, // 3bar => 3-bar
+			/([A-Za-z])([0-9])/g, // Foo3 => foo-3, foo3 => foo-3
+			/([A-Z])([A-Z][a-z])/g, // FOOBar => foo-bar
+		],
+	} );
+}
+
 /**
  * Clones an object.
  * Non-object values are returned unchanged.

packages/block-editor/src/utils/test/object.js

@@ -1,7 +1,102 @@
 /**
  * Internal dependencies
  */
-import { setImmutably } from '../object';
+import { kebabCase, setImmutably } from '../object';
+
+describe( 'kebabCase', () => {
+	it( 'separates lowercase letters, followed by uppercase letters', () => {
+		expect( kebabCase( 'fooBar' ) ).toEqual( 'foo-bar' );
+	} );
+
+	it( 'separates numbers, followed by uppercase letters', () => {
+		expect( kebabCase( '123FOO' ) ).toEqual( '123-foo' );
+	} );
+
+	it( 'separates numbers, followed by lowercase characters', () => {
+		expect( kebabCase( '123bar' ) ).toEqual( '123-bar' );
+	} );
+
+	it( 'separates uppercase letters, followed by numbers', () => {
+		expect( kebabCase( 'FOO123' ) ).toEqual( 'foo-123' );
+	} );
+
+	it( 'separates lowercase letters, followed by numbers', () => {
+		expect( kebabCase( 'foo123' ) ).toEqual( 'foo-123' );
+	} );
+
+	it( 'separates uppercase groups from capitalized groups', () => {
+		expect( kebabCase( 'FOOBar' ) ).toEqual( 'foo-bar' );
+	} );
+
+	it( 'removes any non-dash special characters', () => {
+		expect(
+			kebabCase( 'foo±§!@#$%^&*()-_=+/?.>,<\\|{}[]`~\'";:bar' )
+		).toEqual( 'foo-bar' );
+	} );
+
+	it( 'removes any spacing characters', () => {
+		expect( kebabCase( ' foo \t \n \r \f \v bar ' ) ).toEqual( 'foo-bar' );
+	} );
+
+	it( 'groups multiple dashes into a single one', () => {
+		expect( kebabCase( 'foo---bar' ) ).toEqual( 'foo-bar' );
+	} );
+
+	it( 'returns an empty string unchanged', () => {
+		expect( kebabCase( '' ) ).toEqual( '' );
+	} );
+
+	it( 'returns an existing kebab case string unchanged', () => {
+		expect( kebabCase( 'foo-123-bar' ) ).toEqual( 'foo-123-bar' );
+	} );
+
+	it( 'returns an empty string if any nullish type is passed', () => {
+		expect( kebabCase( undefined ) ).toEqual( '' );
+		expect( kebabCase( null ) ).toEqual( '' );
+	} );
+
+	it( 'converts any unexpected non-nullish type to a string', () => {
+		expect( kebabCase( 12345 ) ).toEqual( '12345' );
+		expect( kebabCase( [] ) ).toEqual( '' );
+		expect( kebabCase( {} ) ).toEqual( 'object-object' );
+	} );
+
+	/**
+	 * Should cover all test cases of `_wp_to_kebab_case()`.
+	 *
+	 * @see https://developer.wordpress.org/reference/functions/_wp_to_kebab_case/
+	 * @see https://github.com/WordPress/wordpress-develop/blob/76376fdbc3dc0b3261de377dffc350677345e7ba/tests/phpunit/tests/functions/wpToKebabCase.php#L35-L62
+	 */
+	it.each( [
+		[ 'white', 'white' ],
+		[ 'white+black', 'white-black' ],
+		[ 'white:black', 'white-black' ],
+		[ 'white*black', 'white-black' ],
+		[ 'white.black', 'white-black' ],
+		[ 'white black', 'white-black' ],
+		[ 'white	black', 'white-black' ],
+		[ 'white-to-black', 'white-to-black' ],
+		[ 'white2white', 'white-2-white' ],
+		[ 'white2nd', 'white-2nd' ],
+		[ 'white2ndcolor', 'white-2-ndcolor' ],
+		[ 'white2ndColor', 'white-2nd-color' ],
+		[ 'white2nd_color', 'white-2nd-color' ],
+		[ 'white23color', 'white-23-color' ],
+		[ 'white23', 'white-23' ],
+		[ '23color', '23-color' ],
+		[ 'white4th', 'white-4th' ],
+		[ 'font2xl', 'font-2-xl' ],
+		[ 'whiteToWhite', 'white-to-white' ],
+		[ 'whiteTOwhite', 'white-t-owhite' ],
+		[ 'WHITEtoWHITE', 'whit-eto-white' ],
+		[ 42, '42' ],
+		[ "i've done", 'ive-done' ],
+		[ '#ffffff', 'ffffff' ],
+		[ '$ffffff', 'ffffff' ],
+	] )( 'converts %s properly to %s', ( input, expected ) => {
+		expect( kebabCase( input ) ).toEqual( expected );
+	} );
+} );
 
 describe( 'setImmutably', () => {
 	describe( 'handling falsy values properly', () => {