Fix REPL

Author: dy

README.md

@@ -1,4 +1,4 @@
-# sub✦script [![build](https://github.com/dy/subscript/actions/workflows/node.js.yml/badge.svg)](https://github.com/dy/subscript/actions/workflows/node.js.yml) [![npm](https://img.shields.io/npm/v/subscript)](http://npmjs.org/subscript) [![ॐ](https://img.shields.io/badge/MIT-%E0%A5%90-white)](https://krishnized.github.io/license)
+# sub<sub><sup> ✦ </sup></sub>script [![build](https://github.com/dy/subscript/actions/workflows/node.js.yml/badge.svg)](https://github.com/dy/subscript/actions/workflows/node.js.yml) [![npm](https://img.shields.io/npm/v/subscript)](http://npmjs.org/subscript) [![demo](https://img.shields.io/badge/demo-%F0%9F%9A%80-white)](https://dy.github.io/subscript/repl) [![ॐ](https://img.shields.io/badge/MIT-%E0%A5%90-white)](https://krishnized.github.io/license)
 
 > Safe expression evaluator & language tool.
 
@@ -15,8 +15,6 @@ subscript`a + b * 2`({ a: 1, b: 3 })  // 7
 * **Self-hosting** — compiles own source (js in js)
 * **Language tool** — modular syntax extensions for custom DSL
 
-[**Try REPL →**](https://dy.github.io/subscript/repl.html)
-
 
 ## Presets
 
@@ -72,7 +70,7 @@ token('px', 200, n => n && [, n[1] + 'px'])  // 5px → "5px"
 See [docs.md](./docs.md) for full API.
 
 
-## Expressions
+## Expressions format
 
 Subscript uses simplified syntax tree format:
 
@@ -106,7 +104,6 @@ subscript`constructor.constructor("alert(1)")()`({})
 // undefined (blocked)
 ```
 
-
 ## Performance
 
 Parse 30k times:
@@ -115,32 +112,39 @@ subscript: ~150 ms 🥇
 justin: ~183 ms
 jsep: ~270 ms 🥈
 jexpr: ~297 ms 🥉
-```
-<!--
 mr-parser: ~420 ms
 expr-eval: ~480 ms
 math-parser: ~570 ms
 math-expression-evaluator: ~900ms
 jexl: ~1056 ms
 mathjs: ~1200 ms
 new Function: ~1154 ms
--->
 
-Evaluate 30k times:
-```
+// Evaluate 30k times:
 new Function  ~7ms   🥇
 subscript     ~15ms  🥈
 justin: ~17 ms
 jsep          ~30ms  🥉
-```
-<!--
 math-expression-evaluator: ~50ms
 expr-eval: ~72 ms
 jexl: ~110 ms
 mathjs: ~119 ms
-mr-parser: -
-math-parser: -
--->
+```
+
+
+## Utils
+
+**Bundle** — create custom dialect bundle:
+```js
+import { bundle } from 'subscript/util/bundle.js'
+
+// Bundle specific features into single file
+const code = await bundle('subscript/jessie.js')
+// → self-contained ES module with parse, compile exports
+```
+
+**REPL** — interactive dialect builder with live bundling:
+[**Try REPL →**](https://dy.github.io/subscript/repl.html)
 
 
 ## Used by

feature/member.js feature/access.jsfeature/member.js renamed to feature/access.js

@@ -1,5 +1,5 @@
 /**
- * Property access and function calls: a.b, a[b], a(b)
+ * Property access: a.b, a[b], a(b), [1,2,3]
  * For private fields (#x), see class.js
  */
 import { access, binary, operator, compile } from '../parse.js';
@@ -24,7 +24,7 @@ operator('[]', (a, b) => {
   // Array literal: [1,2,3] - b is strictly undefined (AST length 2)
   if (b === undefined) {
     a = !a ? [] : a[0] === ',' ? a.slice(1) : [a];
-    a = a.map(a => a[0] === '...' ? (a = compile(a[1]), ctx => a(ctx)) : (a = compile(a), ctx => [a(ctx)]));
+    a = a.map(a => a == null ? (() => undefined) : a[0] === '...' ? (a = compile(a[1]), ctx => a(ctx)) : (a = compile(a), ctx => [a(ctx)]));
     return ctx => a.flatMap(a => a(ctx));
   }
   // Member access: a[b]

feature/group.js

@@ -1,6 +1,6 @@
 import { nary, group, operator, compile } from '../parse.js';
 import { BREAK, CONTINUE } from './loop.js';
-import { prop } from './member.js';
+import { prop } from './access.js';
 
 const STATEMENT = 5, SEQ = 10, ACCESS = 170;
 

feature/module.js

@@ -32,3 +32,11 @@ keyword('export', STATEMENT, () => (space(), ['export', expr(STATEMENT)]));
 
 // default: prefix for export default
 keyword('default', SEQ + 1, () => (space(), ['default', expr(SEQ)]));
+
+// Compile stubs - import/export are parse-only (no runtime semantics)
+import { operator, compile } from '../parse.js';
+operator('import', () => () => undefined);
+operator('export', () => () => undefined);
+operator('from', (a, b) => () => undefined);
+operator('as', (a, b) => () => undefined);
+operator('default', (a) => compile(a));

feature/op/assign-logical.js

@@ -5,7 +5,7 @@
  */
 import { binary, operator, compile } from '../../parse.js';
 import { destructure } from '../destruct.js';
-import { isLval, prop } from '../member.js';
+import { isLval, prop } from '../access.js';
 
 const ASSIGN = 20;
 const err = msg => { throw Error(msg) };

feature/op/bitwise-unsigned.js

@@ -4,7 +4,7 @@
  * >>> >>>=
  */
 import { binary, operator, compile } from '../../parse.js';
-import { isLval, prop } from '../member.js';
+import { isLval, prop } from '../access.js';
 
 const ASSIGN = 20, SHIFT = 100;
 const err = msg => { throw Error(msg) };

feature/op/optional.js

@@ -8,7 +8,7 @@
  * Common in: JS, TS, Swift, Kotlin, C#
  */
 import { token, expr, skip, space, operator, compile } from '../../parse.js';
-import { unsafe } from '../member.js';
+import { unsafe } from '../access.js';
 
 const ACCESS = 170;
 

feature/op/pow.js

@@ -6,7 +6,7 @@
  * ES2016+, not in classic JS/C
  */
 import { binary, operator, compile } from '../../parse.js';
-import { isLval, prop } from '../member.js';
+import { isLval, prop } from '../access.js';
 
 const EXP = 130, ASSIGN = 20;
 

parse.js

@@ -17,7 +17,7 @@ export let idx, cur,
     chr = (cur[at] || '∅') + ptr,
     after = cur.slice(at + 1, at + 20)
   ) => {
-    throw SyntaxError(`${msg} at ${lines.length + 1}:${last.length + 1} — ${before}${chr}${after}`)
+    throw SyntaxError(`${msg} at ${lines.length + 1}:${last.length + 1}\n${(cur[at-41]!=='\n' ? '...' : '') +before}${chr}${after}`)
   },
 
   // attach location to node (returns node for chaining)