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parity probe: cross-tier corpus + fix python remainder + asm modulo

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New: wasm/tests/parity-cross-tier.mjs runs the parity-corpus.mjs (216
test cases tagged by whitepaper section / R7RS concept) against three
tiers — native python (reference), c-wasm, asm-wasm — and fails on any
unknown divergence. Known gaps live in KNOWN_DIVERGE so the table stays
green while the bignum / call/cc / etc. work proceeds.

Wired into `make wasm-test` so a regression against any spec claim gets
caught before merge.

Bugs caught and fixed:
  - python remainder: was `signed_a % signed_b * sign(a)`, which double-
    applied the sign of a (python's % floors) — gave -3 for (-17, 5)
    instead of the R7RS-correct -2. Now uses abs() on both sides.
  - asm-wasm modulo: was i32.rem_s (truncated, remainder semantics)
    where R7RS modulo wants sign of divisor. Added the "if rem and
    divisor disagree on sign, add divisor" branch.

Cross-tier numbers after fix:
  216 passing
    3 known diverge: expt-2-100, expt-3-50, big-arith — all asm-wasm
      (no bignums on the asm tier yet; whitepaper §2.1 claim still open)
    0 fail

REPL layout: body is now the scroll container, prompt-bar is
position:fixed at the viewport bottom so it doesn't get pushed off
screen by a long transcript. Empty space above the prompt on a fresh
session reads like a terminal.

All other tests still pass: 20 unit, 8 integration, 11 functional.
This commit is contained in:
russell@unturf.com 2026-06-14 15:21:19 -04:00
parent c50a9da7e8
commit 7ea65dba21
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17 changed files with 357 additions and 38 deletions
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24
www/repl/repl.css
View file

@ -1,11 +1,12 @@
/* lumbda repl — grid-only layout. Inherits palette + base from style.css. */
body.repl {
display: grid;
/* header (fixed) scrolling-stream (everything else) */
grid-template-rows: auto 1fr;
height: 100vh;
overflow: hidden;
/* Body scrolls naturally. The prompt-bar is position: fixed so it
* stays glued to the viewport bottom; the transcript reserves bottom
* padding equal to the prompt-bar height so its last line isn't hidden
* underneath. */
min-height: 100vh;
overflow: auto;
}
/* ─── Lock screen overlay ──────────────────────────────────────── */
@ -176,12 +177,13 @@ body.repl {
* fresh sessions show the prompt up near the top and it drifts down
* with each new entry. */
.repl-stream {
overflow: auto;
padding: 0.5rem 1rem 0.8rem;
padding: 0.5rem 1rem 0;
background: var(--code-bg);
display: grid;
grid-template-rows: auto auto auto;
align-content: start;
/* Leave room for the fixed prompt bar at the viewport bottom. */
padding-bottom: calc(3.6rem + env(safe-area-inset-bottom, 0));
}
.transcript {
font-family: var(--mono);
@ -232,12 +234,16 @@ body.repl {
/* ─── Prompt bar ───────────────────────────────────────────────── */
.prompt-bar {
position: fixed;
left: 0; right: 0; bottom: 0;
z-index: 50;
display: grid;
grid-template-columns: auto 1fr auto auto;
gap: 0.4rem;
align-items: center;
padding: 0.3rem 0;
background: transparent;
padding: 0.5rem 1rem;
background: var(--code-bg);
border-top: 1px solid var(--rule);
}
.prompt-bar .prompt-sigil {
color: var(--green);