1 files changed, 142 insertions, 0 deletions
diff --git a/packages/astro-parser/src/utils/names.ts b/packages/astro-parser/src/utils/names.ts
new file mode 100644
index 000000000..f041d20ce
--- /dev/null
+++ b/packages/astro-parser/src/utils/names.ts
@@ -0,0 +1,142 @@
+import { isIdentifierStart, isIdentifierChar } from 'acorn';
+import full_char_code_at from './full_char_code_at.js';
+
+export const globals = new Set([
+  'alert',
+  'Array',
+  'Boolean',
+  'clearInterval',
+  'clearTimeout',
+  'confirm',
+  'console',
+  'Date',
+  'decodeURI',
+  'decodeURIComponent',
+  'document',
+  'Element',
+  'encodeURI',
+  'encodeURIComponent',
+  'Error',
+  'EvalError',
+  'Event',
+  'EventSource',
+  'fetch',
+  'global',
+  'globalThis',
+  'history',
+  'Infinity',
+  'InternalError',
+  'Intl',
+  'isFinite',
+  'isNaN',
+  'JSON',
+  'localStorage',
+  'location',
+  'Map',
+  'Math',
+  'NaN',
+  'navigator',
+  'Number',
+  'Node',
+  'Object',
+  'parseFloat',
+  'parseInt',
+  'process',
+  'Promise',
+  'prompt',
+  'RangeError',
+  'ReferenceError',
+  'RegExp',
+  'sessionStorage',
+  'Set',
+  'setInterval',
+  'setTimeout',
+  'String',
+  'SyntaxError',
+  'TypeError',
+  'undefined',
+  'URIError',
+  'URL',
+  'window',
+]);
+
+export const reserved = new Set([
+  'arguments',
+  'await',
+  'break',
+  'case',
+  'catch',
+  'class',
+  'const',
+  'continue',
+  'debugger',
+  'default',
+  'delete',
+  'do',
+  'else',
+  'enum',
+  'eval',
+  'export',
+  'extends',
+  'false',
+  'finally',
+  'for',
+  'function',
+  'if',
+  'implements',
+  'import',
+  'in',
+  'instanceof',
+  'interface',
+  'let',
+  'new',
+  'null',
+  'package',
+  'private',
+  'protected',
+  'public',
+  'return',
+  'static',
+  'super',
+  'switch',
+  'this',
+  'throw',
+  'true',
+  'try',
+  'typeof',
+  'var',
+  'void',
+  'while',
+  'with',
+  'yield',
+]);
+
+const void_element_names = /^(?:area|base|br|col|command|embed|hr|img|input|keygen|link|meta|param|source|track|wbr)$/;
+
+/** Is this a void HTML element? */
+export function is_void(name: string) {
+  return void_element_names.test(name) || name.toLowerCase() === '!doctype';
+}
+
+/** Is this a valid HTML element? */
+export function is_valid(str: string): boolean {
+  let i = 0;
+
+  while (i < str.length) {
+    const code = full_char_code_at(str, i);
+    if (!(i === 0 ? isIdentifierStart : isIdentifierChar)(code, true)) return false;
+
+    i += code <= 0xffff ? 1 : 2;
+  }
+
+  return true;
+}
+
+/** Utility to normalize HTML */
+export function sanitize(name: string) {
+  return name
+    .replace(/[^a-zA-Z0-9_]+/g, '_')
+    .replace(/^_/, '')
+    .replace(/_$/, '')
+    .replace(/^[0-9]/, '_$&');
+}