js-on-sx: baseline commit (278/280 unit, 148/148 slice, runner stub)

Initial commit of the lib/js/ tree and plans/ directory. A previous
session left template-string work in progress — 278/280 unit tests pass
(2 failing: tpl part-count off-by-one, escaped-backtick ident lookup).
test262-runner.py and scoreboard are placeholders (0/8 with 7 timeouts);
fixing the runner is the next queue item.

lib/js/test262-slice/README.md

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+# JS-on-SX cherry-picked conformance slice
+
+A hand-picked slice inspired by test262 expression tests. Each test is one
+JS expression in a `.js` file, paired with an `.expected` file containing
+the SX-printed result that `js-eval` should produce.
+
+Run via:
+
+    bash lib/js/conformance.sh
+
+The slice intentionally avoids anything not yet implemented (statements,
+`var`/`let`, `function`, regex, template strings, prototypes, `new`,
+`this`, classes, async). Those land in later phases.
+
+## Expected value format
+
+`js-eval` returns SX values. The epoch protocol prints them thus:
+
+| JS value         | Expected file contents |
+|------------------|-----------------------|
+| `42`             | `42`                  |
+| `3.14`           | `3.14`                |
+| `true` / `false` | `true` / `false`      |
+| `"hi"`           | `"hi"`                |
+| `null`           | `nil`                 |
+| `undefined`      | `"js-undefined"`      |
+| `[1,2,3]`        | `(1 2 3)`             |
+| `{}`             | `{}`                  |
+
+The runner does a substring match — the `.expected` file can contain just
+the distinguishing part of the result.

lib/js/test262-slice/arithmetic/add.expected

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+3

lib/js/test262-slice/arithmetic/add.js

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+1 + 2

lib/js/test262-slice/arithmetic/big_expr.expected

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+5

lib/js/test262-slice/arithmetic/big_expr.js

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+1 + 2 * 3 - 4 / 2

lib/js/test262-slice/arithmetic/bitnot.expected

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+-6

lib/js/test262-slice/arithmetic/bitnot.js

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+~5

lib/js/test262-slice/arithmetic/chained.expected

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+10

lib/js/test262-slice/arithmetic/chained.js

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+1 + 2 + 3 + 4

lib/js/test262-slice/arithmetic/div.expected

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+3

lib/js/test262-slice/arithmetic/div.js

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+12 / 4

lib/js/test262-slice/arithmetic/mixed_concat.expected

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+"12"

lib/js/test262-slice/arithmetic/mixed_concat.js

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+1 + "2"

lib/js/test262-slice/arithmetic/mod.expected

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+1

lib/js/test262-slice/arithmetic/mod.js

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+10 % 3

lib/js/test262-slice/arithmetic/neg.expected

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+-5

lib/js/test262-slice/arithmetic/neg.js

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+-5

lib/js/test262-slice/arithmetic/paren_precedence.expected

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+9

lib/js/test262-slice/arithmetic/paren_precedence.js

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+(1 + 2) * 3

lib/js/test262-slice/arithmetic/pos.expected

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+5

lib/js/test262-slice/arithmetic/pos.js

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++5

lib/js/test262-slice/arithmetic/pow.expected

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+1024

lib/js/test262-slice/arithmetic/pow.js

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+2 ** 10

lib/js/test262-slice/arithmetic/pow_right_assoc.expected

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+512

lib/js/test262-slice/arithmetic/pow_right_assoc.js

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+2 ** 3 ** 2

lib/js/test262-slice/arithmetic/precedence.expected

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+7

lib/js/test262-slice/arithmetic/precedence.js

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+1 + 2 * 3

lib/js/test262-slice/arithmetic/string_concat.expected

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+"ab"

lib/js/test262-slice/arithmetic/string_concat.js

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+"a" + "b"

lib/js/test262-slice/arithmetic/sub.expected

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+6

lib/js/test262-slice/arithmetic/sub.js

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+10 - 4

lib/js/test262-slice/async/async_arrow.expected

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+42

lib/js/test262-slice/async/async_arrow.js

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+var double = async x => x * 2;
+var r = null;
+double(21).then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/async_arrow_multiparam.expected

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+42

lib/js/test262-slice/async/async_arrow_multiparam.js

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+var add = async (a, b) => a + b;
+var r = null;
+add(10, 32).then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/async_fn_basic.expected

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+42

lib/js/test262-slice/async/async_fn_basic.js

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+async function f() { return 42; }
+var r = null;
+f().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/async_fn_throws.expected

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+nope

lib/js/test262-slice/async/async_fn_throws.js

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+async function f() { throw "nope"; }
+var r = null;
+f().catch(e => { r = e; });
+__drain();
+r

lib/js/test262-slice/async/async_nested_calls.expected

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+33

lib/js/test262-slice/async/async_nested_calls.js

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+async function inner(x) { return x * 2; }
+async function middle(x) { var r = await inner(x); return r + 1; }
+async function outer(x) { var r = await middle(x); return r * 3; }
+var result = null;
+outer(5).then(v => { result = v; });
+__drain();
+result

lib/js/test262-slice/async/async_returns_promise.expected

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+100

lib/js/test262-slice/async/async_returns_promise.js

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+async function wrap(x) { return Promise.resolve(x); }
+var r = null;
+wrap(100).then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_basic.expected

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+70

lib/js/test262-slice/async/await_basic.js

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+async function add(a, b) { return a + b; }
+async function main() {
+  var r = await add(3, 4);
+  return r * 10;
+}
+var result = null;
+main().then(v => { result = v; });
+__drain();
+result

lib/js/test262-slice/async/await_chain.expected

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+3

lib/js/test262-slice/async/await_chain.js

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+async function step() { return 1; }
+async function main() {
+  var a = await step();
+  var b = await step();
+  var c = await step();
+  return a + b + c;
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_in_loop.expected

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+5

lib/js/test262-slice/async/await_in_loop.js

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+async function one() { return 1; }
+async function main() {
+  var sum = 0;
+  for (var i = 0; i < 5; i = i + 1) {
+    sum = sum + await one();
+  }
+  return sum;
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_nonpromise.expected

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+43

lib/js/test262-slice/async/await_nonpromise.js

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+async function main() {
+  var x = await 42;
+  return x + 1;
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_promise_all.expected

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+6

lib/js/test262-slice/async/await_promise_all.js

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+async function main() {
+  var vs = await Promise.all([Promise.resolve(1), Promise.resolve(2), Promise.resolve(3)]);
+  return vs[0] + vs[1] + vs[2];
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_rejected.expected

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+caught:no

lib/js/test262-slice/async/await_rejected.js

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+async function bad() { throw "no"; }
+async function main() {
+  try { await bad(); return "unreachable"; }
+  catch (e) { return "caught:" + e; }
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_throws_error_object.expected

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+bad

lib/js/test262-slice/async/await_throws_error_object.js

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+async function failing() { throw new Error("bad"); }
+async function main() {
+  try { await failing(); return "unreachable"; }
+  catch (e) { return e.message; }
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/closures/adder.expected

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+44

lib/js/test262-slice/closures/adder.js

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+function mk(n) { return x => x + n; } let add7 = mk(7); add7(10) + add7(20)

lib/js/test262-slice/closures/counter.expected

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+4

lib/js/test262-slice/closures/counter.js

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+function mkc() { let n = 0; return () => { n = n + 1; return n; }; } let c = mkc(); c(); c(); c(); c()

lib/js/test262-slice/closures/multi_closure.expected

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+42

lib/js/test262-slice/closures/multi_closure.js

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+function mkPair() { let x = 0; let y = 0; let setX = v => { x = v; }; let setY = v => { y = v; }; let get = () => x + y; setX(17); setY(25); return get(); } mkPair()

lib/js/test262-slice/closures/nested_scope.expected

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+3

lib/js/test262-slice/closures/nested_scope.js

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+function outer() { let a = 1; function inner() { let b = 2; function deepest() { return a + b; } return deepest(); } return inner(); } outer()

lib/js/test262-slice/closures/sum_sq.expected

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+55

lib/js/test262-slice/closures/sum_sq.js

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+function sumSq(xs) { let t = 0; for (let i = 0; i < xs.length; i = i + 1) t = t + xs[i] * xs[i]; return t; } sumSq([1,2,3,4,5])

lib/js/test262-slice/coercion/implicit_str_add.expected

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+"n=42"

lib/js/test262-slice/coercion/implicit_str_add.js

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+"n=" + 42

lib/js/test262-slice/coercion/loose_str_num.expected

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+true

lib/js/test262-slice/coercion/loose_str_num.js

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+"5" == 5

lib/js/test262-slice/coercion/typeof_bool.expected

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+"boolean"

lib/js/test262-slice/coercion/typeof_bool.js

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+typeof true

lib/js/test262-slice/coercion/typeof_fn.expected

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+"function"

lib/js/test262-slice/coercion/typeof_fn.js

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+typeof (x => x)

lib/js/test262-slice/coercion/typeof_null.expected

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+"object"

lib/js/test262-slice/coercion/typeof_null.js

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+typeof null

lib/js/test262-slice/coercion/typeof_num.expected

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+"number"

lib/js/test262-slice/coercion/typeof_num.js

@@ -0,0 +1 @@
+typeof 42

lib/js/test262-slice/coercion/typeof_str.expected

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+"string"

lib/js/test262-slice/coercion/typeof_str.js

@@ -0,0 +1 @@
+typeof "x"

lib/js/test262-slice/coercion/typeof_undef.expected

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+"undefined"

lib/js/test262-slice/coercion/typeof_undef.js

@@ -0,0 +1 @@
+typeof undefined

lib/js/test262-slice/collections/array_empty.expected

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+0

lib/js/test262-slice/collections/array_empty.js

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+[].length

lib/js/test262-slice/collections/array_index.expected

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+20

lib/js/test262-slice/collections/array_index.js

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+[10,20,30][1]

lib/js/test262-slice/collections/array_length.expected

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+3

lib/js/test262-slice/collections/array_length.js

@@ -0,0 +1 @@
+[1,2,3].length

lib/js/test262-slice/collections/array_nested.expected

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+3

lib/js/test262-slice/collections/array_nested.js

@@ -0,0 +1 @@
+[[1,2],[3,4]][1][0]

lib/js/test262-slice/collections/array_plus_length.expected

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+5

lib/js/test262-slice/collections/array_plus_length.js

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+[1,2,3].length + [4,5].length

lib/js/test262-slice/collections/object_chain.expected

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+42

lib/js/test262-slice/collections/object_chain.js

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+({a:{b:{c:42}}}).a.b.c

lib/js/test262-slice/collections/object_prop.expected

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+1

lib/js/test262-slice/collections/object_prop.js

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+({x:1,y:2}).x

lib/js/test262-slice/collections/string_index.expected

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+"e"

lib/js/test262-slice/collections/string_index.js

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+"hello"[1]

lib/js/test262-slice/collections/string_length.expected

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+5