add component state, top-level await support (#26)

1 files changed, 42 insertions, 0 deletions

diff --git a/src/parser/parse/read/expression.ts b/src/parser/parse/read/expression.ts
new file mode 100644
index 000000000..f691f4772
--- /dev/null
+++ b/src/parser/parse/read/expression.ts
@@ -0,0 +1,42 @@
+import { parse_expression_at } from '../acorn.js';
+import { Parser } from '../index.js';
+import { whitespace } from '../../utils/patterns.js';
+// import { Node } from 'estree';
+
+// @ts-ignore
+export default function read_expression(parser: Parser): string {
+  try {
+    const start = parser.index;
+    let index = parse_expression_at(parser.template, parser.index);
+    let num_parens = 0;
+
+    for (let i = parser.index; i < start; i += 1) {
+      if (parser.template[i] === '(') num_parens += 1;
+    }
+
+    while (num_parens > 0) {
+      const char = parser.template[index];
+
+      if (char === ')') {
+        num_parens -= 1;
+      } else if (!whitespace.test(char)) {
+        parser.error(
+          {
+            code: 'unexpected-token',
+            message: 'Expected )',
+          },
+          index
+        );
+      }
+
+      index += 1;
+    }
+
+    parser.index = index;
+
+    return parser.template.substring(start, index);
+    // return node as Node;
+  } catch (err) {
+    parser.acorn_error(err);
+  }
+}
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