From 6215b1177e377b512aaa1296faa6311f809135f2 Mon Sep 17 00:00:00 2001
From: eunhhu <necpition205@gmail.com>
Date: Mon, 19 Oct 2026 06:18:49 +0100
Subject: 140's 8, box layout, written in aup with no new opcode (aup's
 examples/layout.aup: a subset of CSS Flexbox 1 written down first, one line,
 row or column, padding, gap, six justify-content, four align-items, grow and
 shrink with 9.7's loop, cross sizes stretched, nothing sized by content):
 2,000 random trees (29,388 nodes; 7,659 items frozen at their padding by the
 loop) are Taffy 0.15's within 0.01 (layout_taffy, built by cargo; the worst
 8.3e-5) and layout.py's bit for bit on the three paths, the paths the same;
 the single-pass subset first tried refused 66% of trees, so the loop came in;
 Taffy given min sizes equal to the padding (given 0 it floors at 0 while
 resolving lengths, where 9.7 floors the content box), the reference adding
 from the left (sum compensates since Python 3.12); module_specs in make
 check: 100 trees (tests/specs/layout); bars: 116 lines against Python's 54,
 4,754 ns a node, Taffy's 644 (7.4x), pure Python 5,396 (Pure 1.14x faster),
 1,494 instructions a node (9.7's loop 44%); four frictions; aup's rows read
 by position no longer copy (99,067 ns a node before); the suite table's row
 8; CHECKPOINT's direction row

---
 tests/check.py               |  25 ++++++++++++++++++++++++-
 tests/specs/layout/README.md |   7 +++++++
 tests/specs/layout/trees.bin | Bin 0 -> 218992 bytes
 3 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 tests/specs/layout/README.md
 create mode 100644 tests/specs/layout/trees.bin

(limited to 'tests')

diff --git a/tests/check.py b/tests/check.py
index 5574b80..dd64e03 100644
--- a/tests/check.py
+++ b/tests/check.py
@@ -1738,7 +1738,9 @@ def module_specs(aup, pure, work):
     at a time, cut anywhere, to the same requests; line breaking (UAX #14) by its
     examples/linebreak.aup on LineBreakTest.txt's lines (tests/specs/linebreak);
     RFC 6298's retransmission timer by its examples/rto.aup on a scenario's
-    events (tests/specs/rto), the model's state after each."""
+    events (tests/specs/rto), the model's state after each; box layout (a
+    subset of CSS Flexbox 1) by its examples/layout.aup on trees
+    (tests/specs/layout), each box bit for bit."""
     import hashlib
     import os
     import random
@@ -1988,6 +1990,27 @@ def module_specs(aup, pure, work):
                                                  len(s['retransmits'])] == want, ('rto', period, want)
         events += len(out)
     runs['rto'] = {'scenarios': 2, 'events': events}
+    # Box layout (a subset of CSS Flexbox 1, its examples/layout.aup): trees as layout.py lays them out (tests/specs/layout,
+    # Taffy's within 0.01), a tree a message of its nodes in preorder, its boxes bit for bit on the three paths.
+    program = work / 'layout.pmod'
+    compile_module(aup, EXAMPLES / 'layout.aup', program)
+    given, trees = (pure / 'tests/specs/layout/trees.bin').read_bytes(), []
+    while given:
+        n = struct.unpack_from('<I', given)[0]
+        trees.append((given[4:4 + 112 * n], [list(struct.unpack_from('<4d', given, 4 + 112 * n + 32 * k)) for k in range(n)]))
+        given = given[4 + 144 * n:]
+    given = ''.join(f'message tree {rows.hex()}\n' for rows, _ in trees)
+    shown = {name: subprocess.run([str(pure / 'build/pure-run'), str(program)], input=given, capture_output=True, text=True,
+                                  timeout=120, env=dict(os.environ, **env)).stdout
+             for name, env in (('batches', {'PURE_JIT': '0'}), ('rounds', {'PURE_JIT': '0', 'PURE_BATCH': '0'}), ('all', {'PURE_JIT': 'all'}))}
+    for name in ('rounds', 'all'):
+        assert shown[name] == shown['batches'], ('layout', name)
+    out = shown['batches'].splitlines()
+    assert len(out) == len(trees), ('layout', len(out))
+    for (_, want), line in zip(trees, out):
+        state = json.loads(line)
+        assert state['fault'] == 'none' and [[b['x'], b['y'], b['w'], b['h']] for b in state['states']['boxes']] == want, want
+    runs['layout'] = {'trees': len(trees), 'nodes': sum(len(w) for _, w in trees)}
     return runs
 
 
diff --git a/tests/specs/layout/README.md b/tests/specs/layout/README.md
new file mode 100644
index 0000000..3341c4e
--- /dev/null
+++ b/tests/specs/layout/README.md
@@ -0,0 +1,7 @@
+# Box layout (a subset of CSS Flexbox 1): 100 trees
+
+`trees.bin` holds the first 100 trees `research/experiments/044-specs/layout_check.py` draws, each a u32 count of its
+nodes, their rows in preorder (14 binary64s: parent, column, w, h, grow, shrink, basis, left, right, top, bottom, gap,
+justify, align), then their boxes (x, y, w, h, each relative to its parent's), as `layout.py` works them out; Taffy
+0.15's are the same within 0.01. `tests/check.py`'s `module_specs` gives each tree to aup's `examples/layout.aup` as a
+message, on Pure's three paths: its boxes must be these, bit for bit.
diff --git a/tests/specs/layout/trees.bin b/tests/specs/layout/trees.bin
new file mode 100644
index 0000000..387caff
Binary files /dev/null and b/tests/specs/layout/trees.bin differ
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