1 files changed, 42 insertions, 0 deletions
diff --git a/src/parser/parse/acorn.ts b/src/parser/parse/acorn.ts
new file mode 100644
index 000000000..7fc0f8f67
--- /dev/null
+++ b/src/parser/parse/acorn.ts
@@ -0,0 +1,42 @@
+import type { Node } from 'acorn';
+import { parseExpression } from '@babel/parser';
+// import acorn from 'acorn';
+// // @ts-ignore
+// import jsx from 'acorn-jsx';
+// const acornJsx = acorn.Parser.extend(jsx());
+
+export const parse = (source: string): Node => {
+  throw new Error('No longer used.');
+  // acorn.parse(source, {
+  //   sourceType: 'module',
+  //   ecmaVersion: 2020,
+  //   locations: true,
+  // });
+};
+
+export const parse_expression_at = (source: string, index: number): number => {
+  // TODO: Clean up after acorn -> @babel/parser move
+  try {
+    // First, try to parse the expression. Unlike acorn, @babel/parser isn't relaxed
+    // enough to just stop after the first expression, so we almost always expect a
+    // parser error here instead. This is expected, so handle it.
+    parseExpression(source.slice(index), {
+      sourceType: 'module',
+      plugins: ['jsx', 'typescript'],
+    });
+    throw new Error('Parse error.'); // Expected to fail.
+  } catch (err) {
+    if (err.message.startsWith('Unexpected token') && source[index + err.pos] === '}') {
+      return index + err.pos;
+    }
+    if (err.pos) {
+      err.pos = index + err.pos;
+    }
+    throw err;
+  }
+};
+// acornJsx.parseExpressionAt(source, index, {
+//   sourceType: 'module',
+//   ecmaVersion: 2020,
+//   locations: true,
+// });
+\ No newline at end of file