Style book: create static categories (#65430)

This commit creates a static category map based on list defined in Style Book: Iterate on presentation and design. #53431. It also:

- Sorts examples based on static categories and their subcategories
- Introduces simple layout for subcategories (under theme)
- Adds unit tests for utils
- Converts utils to TypeScript

Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>
Co-authored-by: aaronrobertshaw <aaronrobertshaw@git.wordpress.org>
Co-authored-by: vcanales <vcanales@git.wordpress.org>
Co-authored-by: jasmussen <joen@git.wordpress.org>

packages/edit-site/src/components/style-book/categories.ts

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+/**
+ * WordPress dependencies
+ */
+import { getCategories } from '@wordpress/blocks';
+
+/**
+ * Internal dependencies
+ */
+import type {
+	BlockExample,
+	StyleBookCategory,
+	CategoryExamples,
+} from './types';
+import {
+	STYLE_BOOK_CATEGORIES,
+	STYLE_BOOK_THEME_SUBCATEGORIES,
+} from './constants';
+
+/**
+ * Returns category examples for a given category definition and list of examples.
+ * @param {StyleBookCategory} categoryDefinition The category definition.
+ * @param {BlockExample[]}    examples           An array of block examples.
+ * @return {CategoryExamples|undefined} An object containing the category examples.
+ */
+export function getExamplesByCategory(
+	categoryDefinition: StyleBookCategory,
+	examples: BlockExample[]
+): CategoryExamples | undefined {
+	if ( ! categoryDefinition?.slug || ! examples?.length ) {
+		return;
+	}
+
+	if ( categoryDefinition?.subcategories?.length ) {
+		return categoryDefinition.subcategories.reduce(
+			( acc, subcategoryDefinition ) => {
+				const subcategoryExamples = getExamplesByCategory(
+					subcategoryDefinition,
+					examples
+				);
+				if ( subcategoryExamples ) {
+					acc.subcategories = [
+						...acc.subcategories,
+						subcategoryExamples,
+					];
+				}
+				return acc;
+			},
+			{
+				title: categoryDefinition.title,
+				slug: categoryDefinition.slug,
+				subcategories: [],
+			}
+		);
+	}
+
+	const blocksToInclude = categoryDefinition?.blocks || [];
+	const blocksToExclude = categoryDefinition?.exclude || [];
+	const categoryExamples = examples.filter( ( example ) => {
+		return (
+			! blocksToExclude.includes( example.name ) &&
+			( example.category === categoryDefinition.slug ||
+				blocksToInclude.includes( example.name ) )
+		);
+	} );
+
+	if ( ! categoryExamples.length ) {
+		return;
+	}
+
+	return {
+		title: categoryDefinition.title,
+		slug: categoryDefinition.slug,
+		examples: categoryExamples,
+	};
+}
+
+/**
+ * Returns category examples for a given category definition and list of examples.
+ *
+ * @return {StyleBookCategory[]} An array of top-level category definitions.
+ */
+export function getTopLevelStyleBookCategories(): StyleBookCategory[] {
+	const reservedCategories = [
+		...STYLE_BOOK_THEME_SUBCATEGORIES,
+		...STYLE_BOOK_CATEGORIES,
+	].map( ( { slug } ) => slug );
+	const extraCategories = getCategories().filter(
+		( { slug } ) => ! reservedCategories.includes( slug )
+	);
+	return [ ...STYLE_BOOK_CATEGORIES, ...extraCategories ];
+}

packages/edit-site/src/components/style-book/constants.ts

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+/**
+ * WordPress dependencies
+ */
+import { __ } from '@wordpress/i18n';
+
+/**
+ * Internal dependencies
+ */
+import type { StyleBookCategory } from './types';
+
+export const STYLE_BOOK_THEME_SUBCATEGORIES: Omit<
+	StyleBookCategory,
+	'subcategories'
+>[] = [
+	{
+		slug: 'site-identity',
+		title: __( 'Site Identity' ),
+		blocks: [ 'core/site-logo', 'core/site-title', 'core/site-tagline' ],
+	},
+	{
+		slug: 'design',
+		title: __( 'Design' ),
+		blocks: [ 'core/navigation', 'core/avatar', 'core/post-time-to-read' ],
+		exclude: [ 'core/home-link', 'core/navigation-link' ],
+	},
+	{
+		slug: 'posts',
+		title: __( 'Posts' ),
+		blocks: [
+			'core/post-title',
+			'core/post-excerpt',
+			'core/post-author',
+			'core/post-author-name',
+			'core/post-author-biography',
+			'core/post-date',
+			'core/post-terms',
+			'core/term-description',
+			'core/query-title',
+			'core/query-no-results',
+			'core/query-pagination',
+			'core/query-numbers',
+		],
+	},
+	{
+		slug: 'comments',
+		title: __( 'Comments' ),
+		blocks: [
+			'core/comments-title',
+			'core/comments-pagination',
+			'core/comments-pagination-numbers',
+			'core/comments',
+			'core/comments-author-name',
+			'core/comment-content',
+			'core/comment-date',
+			'core/comment-edit-link',
+			'core/comment-reply-link',
+			'core/comment-template',
+			'core/post-comments-count',
+			'core/post-comments-link',
+		],
+	},
+];
+
+export const STYLE_BOOK_CATEGORIES: StyleBookCategory[] = [
+	{
+		slug: 'text',
+		title: __( 'Text' ),
+		blocks: [
+			'core/post-content',
+			'core/home-link',
+			'core/navigation-link',
+		],
+	},
+	{
+		slug: 'colors',
+		title: __( 'Colors' ),
+		blocks: [ 'custom/colors' ],
+	},
+	{
+		slug: 'theme',
+		title: __( 'Theme' ),
+		subcategories: STYLE_BOOK_THEME_SUBCATEGORIES,
+	},
+	{
+		slug: 'media',
+		title: __( 'Media' ),
+		blocks: [ 'core/post-featured-image' ],
+	},
+	{
+		slug: 'widgets',
+		title: __( 'Widgets' ),
+		blocks: [],
+	},
+	{
+		slug: 'embed',
+		title: __( 'Embeds' ),
+		include: [],
+	},
+];
+
+// The content area of the Style Book is rendered within an iframe so that global styles
+// are applied to elements within the entire content area. To support elements that are
+// not part of the block previews, such as headings and layout for the block previews,
+// additional CSS rules need to be passed into the iframe. These are hard-coded below.
+// Note that button styles are unset, and then focus rules from the `Button` component are
+// applied to the `button` element, targeted via `.edit-site-style-book__example`.
+// This is to ensure that browser default styles for buttons are not applied to the previews.
+export const STYLE_BOOK_IFRAME_STYLES = `
+	// Forming a "block formatting context" to prevent margin collapsing.
+	// @see https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Block_formatting_context
+	.is-root-container {
+		display: flow-root;
+	}
+	
+	body {
+		position: relative;
+		padding: 32px !important;
+	}
+
+	.edit-site-style-book__examples {
+		max-width: 1200px;
+		margin: 0 auto;
+	}
+
+	.edit-site-style-book__example {
+	    max-width: 900px;
+		border-radius: 2px;
+		cursor: pointer;
+		display: flex;
+		flex-direction: column;
+		gap: 40px;
+		padding: 16px;
+		width: 100%;
+		box-sizing: border-box;
+		scroll-margin-top: 32px;
+		scroll-margin-bottom: 32px;
+		margin: 0 auto 40px auto;
+	}
+
+	.edit-site-style-book__example.is-selected {
+		box-shadow: 0 0 0 1px var(--wp-components-color-accent, var(--wp-admin-theme-color, #007cba));
+	}
+
+	.edit-site-style-book__example:focus:not(:disabled) {
+		box-shadow: 0 0 0 var(--wp-admin-border-width-focus) var(--wp-components-color-accent, var(--wp-admin-theme-color, #007cba));
+		outline: 3px solid transparent;
+	}
+
+	.edit-site-style-book__examples.is-wide .edit-site-style-book__example {
+		flex-direction: row;
+	}
+	
+	.edit-site-style-book__subcategory-title,
+	.edit-site-style-book__example-title {
+		font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
+		font-size: 11px;
+		font-weight: 500;
+		line-height: normal;
+		margin: 0;
+		text-align: left;
+		text-transform: uppercase;
+	}
+	
+	.edit-site-style-book__subcategory-title {
+		font-size: 16px;
+		margin-bottom: 40px;
+    	border-bottom: 1px solid #ddd;
+    	padding-bottom: 8px;
+	}
+
+	.edit-site-style-book__examples.is-wide .edit-site-style-book__example-title {
+		text-align: right;
+		width: 120px;
+	}
+
+	.edit-site-style-book__example-preview {
+		width: 100%;
+	}
+
+	.edit-site-style-book__example-preview .block-editor-block-list__insertion-point,
+	.edit-site-style-book__example-preview .block-list-appender {
+		display: none;
+	}
+
+	.edit-site-style-book__example-preview .is-root-container > .wp-block:first-child {
+		margin-top: 0;
+	}
+	.edit-site-style-book__example-preview .is-root-container > .wp-block:last-child {
+		margin-bottom: 0;
+	}
+`;

packages/edit-site/src/components/style-book/examples.ts

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+/**
+ * WordPress dependencies
+ */
+import { __, sprintf } from '@wordpress/i18n';
+import {
+	getBlockType,
+	getBlockTypes,
+	getBlockFromExample,
+	createBlock,
+} from '@wordpress/blocks';
+
+/**
+ * Internal dependencies
+ */
+import type { BlockExample } from './types';
+
+/**
+ * Returns a list of examples for registered block types.
+ *
+ * @return {BlockExample[]} An array of block examples.
+ */
+export function getExamples(): BlockExample[] {
+	const nonHeadingBlockExamples = getBlockTypes()
+		.filter( ( blockType ) => {
+			const { name, example, supports } = blockType;
+			return (
+				name !== 'core/heading' &&
+				!! example &&
+				supports.inserter !== false
+			);
+		} )
+		.map( ( blockType ) => ( {
+			name: blockType.name,
+			title: blockType.title,
+			category: blockType.category,
+			blocks: getBlockFromExample( blockType.name, blockType.example ),
+		} ) );
+	const isHeadingBlockRegistered = !! getBlockType( 'core/heading' );
+
+	if ( ! isHeadingBlockRegistered ) {
+		return nonHeadingBlockExamples;
+	}
+
+	// Use our own example for the Heading block so that we can show multiple
+	// heading levels.
+	const headingsExample = {
+		name: 'core/heading',
+		title: __( 'Headings' ),
+		category: 'text',
+		blocks: [ 1, 2, 3, 4, 5, 6 ].map( ( level ) => {
+			return createBlock( 'core/heading', {
+				content: sprintf(
+					// translators: %d: heading level e.g: "1", "2", "3"
+					__( 'Heading %d' ),
+					level
+				),
+				level,
+			} );
+		} ),
+	};
+
+	return [ headingsExample, ...nonHeadingBlockExamples ];
+}