Add optional native parser routing

Author: adamziel

packages/mysql-on-sqlite/src/mysql/class-wp-mysql-lexer.php

@@ -2,5 +2,9 @@
 
 require_once __DIR__ . '/class-wp-mysql-polyfill-lexer.php';
 
-class WP_MySQL_Lexer extends WP_MySQL_Polyfill_Lexer {
+if ( ! class_exists( 'WP_MySQL_Native_Lexer', false ) ) {
+	require_once __DIR__ . '/class-wp-mysql-native-lexer.php';
+}
+
+class WP_MySQL_Lexer extends WP_MySQL_Native_Lexer {
 }

packages/mysql-on-sqlite/src/mysql/class-wp-mysql-native-lexer.php

@@ -0,0 +1,4 @@
+<?php
+
+class WP_MySQL_Native_Lexer extends WP_MySQL_Polyfill_Lexer {
+}

packages/mysql-on-sqlite/src/mysql/class-wp-mysql-native-parser.php

@@ -0,0 +1,4 @@
+<?php
+
+class WP_MySQL_Native_Parser extends WP_MySQL_Polyfill_Parser {
+}

packages/mysql-on-sqlite/src/mysql/class-wp-mysql-parser.php

@@ -2,5 +2,13 @@
 
 require_once __DIR__ . '/class-wp-mysql-polyfill-parser.php';
 
-class WP_MySQL_Parser extends WP_MySQL_Polyfill_Parser {
+if ( class_exists( 'WP_MySQL_Native_Parser', false ) ) {
+	if ( ! function_exists( 'wp_sqlite_mysql_native_export_grammar' ) ) {
+		require_once __DIR__ . '/mysql-rust-bridge.php';
+	}
+} else {
+	require_once __DIR__ . '/class-wp-mysql-native-parser.php';
+}
+
+class WP_MySQL_Parser extends WP_MySQL_Native_Parser {
 }

packages/mysql-on-sqlite/src/mysql/mysql-rust-bridge.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * Bridge helpers for the optional Rust MySQL lexer/parser extension.
+ * PHP keeps the grammar object, while Rust owns the exported parser state.
+ */
+
+/**
+ * Export grammar internals for the native parser.
+ *
+ * @param WP_Parser_Grammar $grammar Parser grammar.
+ * @return array<string, mixed>
+ */
+function wp_sqlite_mysql_native_export_grammar( WP_Parser_Grammar $grammar ): array {
+	return array(
+		'highest_terminal_id'         => $grammar->highest_terminal_id,
+		'rules'                       => $grammar->rules,
+		'lookahead_is_match_possible' => $grammar->lookahead_is_match_possible,
+		'rule_names'                  => $grammar->rule_names,
+		'fragment_ids'                => $grammar->fragment_ids,
+	);
+}