Inserter: use lighter grammar parse to check allowed status (#64902)

Co-authored-by: ellatrix <ellatrix@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: jsnajdr <jsnajdr@git.wordpress.org>
Co-authored-by: tyxla <tyxla@git.wordpress.org>

packages/block-editor/package.json

@@ -39,6 +39,7 @@
 		"@wordpress/a11y": "file:../a11y",
 		"@wordpress/api-fetch": "file:../api-fetch",
 		"@wordpress/blob": "file:../blob",
+		"@wordpress/block-serialization-default-parser": "file:../block-serialization-default-parser",
 		"@wordpress/blocks": "file:../blocks",
 		"@wordpress/commands": "file:../commands",
 		"@wordpress/components": "file:../components",

packages/block-editor/src/store/private-selectors.js

@@ -20,7 +20,7 @@ import {
 	checkAllowListRecursive,
 	getAllPatternsDependants,
 	getInsertBlockTypeDependants,
-	getParsedPattern,
+	getGrammar,
 } from './utils';
 import { INSERTER_PATTERN_TYPES } from '../components/inserter/block-patterns-tab/utils';
 import { STORE_NAME } from './constants';
@@ -300,10 +300,10 @@ export const hasAllowedPatterns = createRegistrySelector( ( select ) =>
 				if ( ! inserter ) {
 					return false;
 				}
-				const { blocks } = getParsedPattern( pattern );
+				const grammar = getGrammar( pattern );
 				return (
-					checkAllowListRecursive( blocks, allowedBlockTypes ) &&
-					blocks.every( ( { name: blockName } ) =>
+					checkAllowListRecursive( grammar, allowedBlockTypes ) &&
+					grammar.every( ( { name: blockName } ) =>
 						canInsertBlockType( state, blockName, rootClientId )
 					)
 				);

packages/block-editor/src/store/selectors.js

@@ -27,6 +27,7 @@ import {
 	getAllPatternsDependants,
 	getInsertBlockTypeDependants,
 	getParsedPattern,
+	getGrammar,
 } from './utils';
 import { orderBy } from '../utils/sorting';
 import { STORE_NAME } from './constants';
@@ -2376,17 +2377,27 @@ export const __experimentalGetAllowedPatterns = createRegistrySelector(
 			const { getAllPatterns } = unlock( select( STORE_NAME ) );
 			const patterns = getAllPatterns();
 			const { allowedBlockTypes } = getSettings( state );
-
 			const parsedPatterns = patterns
 				.filter( ( { inserter = true } ) => !! inserter )
-				.map( getParsedPattern );
+				.map( ( pattern ) => {
+					return {
+						...pattern,
+						get blocks() {
+							return getParsedPattern( pattern ).blocks;
+						},
+					};
+				} );
+
 			const availableParsedPatterns = parsedPatterns.filter(
-				( { blocks } ) =>
-					checkAllowListRecursive( blocks, allowedBlockTypes )
+				( pattern ) =>
+					checkAllowListRecursive(
+						getGrammar( pattern ),
+						allowedBlockTypes
+					)
 			);
 			const patternsAllowed = availableParsedPatterns.filter(
-				( { blocks } ) =>
-					blocks.every( ( { name } ) =>
+				( pattern ) =>
+					getGrammar( pattern ).every( ( { blockName: name } ) =>
 						canInsertBlockType( state, name, rootClientId )
 					)
 			);

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

@@ -2,6 +2,7 @@
  * WordPress dependencies
  */
 import { parse } from '@wordpress/blocks';
+import { parse as grammarParse } from '@wordpress/block-serialization-default-parser';
 
 /**
  * Internal dependencies
@@ -13,6 +14,7 @@ import { STORE_NAME } from './constants';
 export const withRootClientIdOptionKey = Symbol( 'withRootClientId' );
 
 const parsedPatternCache = new WeakMap();
+const grammarMapCache = new WeakMap();
 
 function parsePattern( pattern ) {
 	const blocks = parse( pattern.content, {
@@ -37,14 +39,24 @@ function parsePattern( pattern ) {
 
 export function getParsedPattern( pattern ) {
 	let parsedPattern = parsedPatternCache.get( pattern );
-	if ( parsedPattern ) {
-		return parsedPattern;
+	if ( ! parsedPattern ) {
+		parsedPattern = parsePattern( pattern );
+		parsedPatternCache.set( pattern, parsedPattern );
 	}
-	parsedPattern = parsePattern( pattern );
-	parsedPatternCache.set( pattern, parsedPattern );
 	return parsedPattern;
 }
 
+export function getGrammar( pattern ) {
+	let grammarMap = grammarMapCache.get( pattern );
+	if ( ! grammarMap ) {
+		grammarMap = grammarParse( pattern.content );
+		// Block names are null only at the top level for whitespace.
+		grammarMap = grammarMap.filter( ( block ) => block.blockName !== null );
+		grammarMapCache.set( pattern, grammarMap );
+	}
+	return grammarMap;
+}
+
 export const checkAllowList = ( list, item, defaultResult = null ) => {
 	if ( typeof list === 'boolean' ) {
 		return list;

packages/block-editor/tsconfig.json

@@ -8,6 +8,7 @@
 	"references": [
 		{ "path": "../a11y" },
 		{ "path": "../api-fetch" },
+		{ "path": "../block-serialization-default-parser" },
 		{ "path": "../blob" },
 		{ "path": "../components" },
 		{ "path": "../compose" },

test/e2e/specs/editor/various/parsing-patterns.spec.js

@@ -0,0 +1,57 @@
+/**
+ * WordPress dependencies
+ */
+const { test, expect } = require( '@wordpress/e2e-test-utils-playwright' );
+
+test.describe( 'Parsing patterns', () => {
+	test( 'Considers a pattern with whitespace an allowed pattern', async ( {
+		admin,
+		editor,
+		page,
+	} ) => {
+		await admin.createNewPost();
+		await editor.insertBlock( {
+			name: 'core/buttons',
+			innerBlocks: [ { name: 'core/button', attributes: { text: 'a' } } ],
+		} );
+		await page.keyboard.press( 'ArrowDown' );
+		await page.getByLabel( 'Toggle block inserter' ).click();
+
+		await page.getByRole( 'tab', { name: 'Patterns' } ).click();
+		await page.evaluate( () => {
+			window.wp.data.dispatch( 'core/block-editor' ).updateSettings( {
+				__experimentalBlockPatterns: [
+					{
+						name: 'test/whitespace',
+						title: 'Pattern with top-level whitespace',
+						description: '',
+						content: `<!-- wp:button -->
+<div class="wp-block-button"><a class="wp-block-button__link wp-element-button">test</a></div>
+<!-- /wp:button -->
+
+<!-- wp:button -->
+<div class="wp-block-button"><a class="wp-block-button__link wp-element-button">test</a></div>
+<!-- /wp:button -->`,
+					},
+				],
+			} );
+		} );
+		await page.fill(
+			'role=region[name="Block Library"i] >> role=searchbox[name="Search for blocks and patterns"i]',
+			'whitespace'
+		);
+		await page
+			.locator( 'role=option[name="Pattern with top-level whitespace"i]' )
+			.click();
+		expect( await editor.getBlocks() ).toMatchObject( [
+			{
+				name: 'core/buttons',
+				innerBlocks: [
+					{ name: 'core/button', attributes: { text: 'a' } },
+					{ name: 'core/button', attributes: { text: 'test' } },
+					{ name: 'core/button', attributes: { text: 'test' } },
+				],
+			},
+		] );
+	} );
+} );