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HS: MutationObserver mock + on mutation dispatch (+7 tests)

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Parser: parse-on-feat now consumes `of FILTER` after `mutation` event-name,
where FILTER is `attributes`/`childList`/`characterData` ident or `@a [or @b]*`
attr-token chain. Emits :of-filter dict on parts. Compiler: scan-on threads
of-filter-info; mutation event-name emits `(do (hs-on …) (hs-on-mutation-attach!
TARGET MODE ATTRS))`. Runtime: hs-on-mutation-attach! constructs a real
MutationObserver with config matched to filter and dispatches "mutation" event
with records detail. Runner: HsMutationObserver mock with global registry;
prototype hooks on El.setAttribute/appendChild/removeChild/_setInnerHTML fire
matching observers synchronously, with __hsMutationActive guard preventing
recursion. Generator: dropped 7 mutation tests from skip-list, added
evaluate(setAttribute) and evaluate(appendChild) body patterns.

hs-upstream-on: 36/70 → 43/70. Smoke 0-195 unchanged at 170/195.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-04-25 11:52:54 +00:00
parent 1340284bc8
commit 13e0254261
9 changed files with 560 additions and 261 deletions
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33
tests/playwright/generate-sx-tests.py
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@@ -114,13 +114,6 @@ SKIP_TEST_NAMES = {
"can filter events based on count range",
"can filter events based on unbounded count range",
"can mix ranges",
"can listen for general mutations",
"can listen for attribute mutations",
"can listen for specific attribute mutations",
"can listen for childList mutations",
"can listen for multiple mutations",
"can listen for multiple mutations 2",
"can listen for attribute mutations on other elements",
"each behavior installation has its own event queue",
"can catch exceptions thrown in js functions",
"can catch exceptions thrown in hyperscript functions",
@@ -1166,6 +1159,32 @@ def parse_dev_body(body, elements, var_names):
ops.append(f'(if (dom-has-class? {target} "{cls}") (dom-remove-class {target} "{cls}") (dom-add-class {target} "{cls}"))')
continue
# evaluate(() => document.querySelector(SEL).setAttribute(NAME, VALUE))
# — used by mutation tests (cluster 32) to trigger MutationObserver.
m = re.match(
r'''evaluate\(\s*\(\)\s*=>\s*document\.querySelector\(\s*([\'"])([^\'"]+)\1\s*\)'''
r'''\.setAttribute\(\s*([\'"])([\w-]+)\3\s*,\s*([\'"])([^\'"]*)\5\s*\)\s*\)\s*$''',
stmt_na, re.DOTALL,
)
if m and seen_html:
sel = re.sub(r'^#work-area\s+', '', m.group(2))
target = selector_to_sx(sel, elements, var_names)
ops.append(f'(dom-set-attr {target} "{m.group(4)}" "{m.group(6)}")')
continue
# evaluate(() => document.querySelector(SEL).appendChild(document.createElement(TAG)))
# — used by mutation childList tests (cluster 32).
m = re.match(
r'''evaluate\(\s*\(\)\s*=>\s*document\.querySelector\(\s*([\'"])([^\'"]+)\1\s*\)'''
r'''\.appendChild\(\s*document\.createElement\(\s*([\'"])([\w-]+)\3\s*\)\s*\)\s*\)\s*$''',
stmt_na, re.DOTALL,
)
if m and seen_html:
sel = re.sub(r'^#work-area\s+', '', m.group(2))
target = selector_to_sx(sel, elements, var_names)
ops.append(f'(dom-append {target} (dom-create-element "{m.group(4)}"))')
continue
# evaluate(() => { var range = document.createRange();
# var textNode = document.getElementById(ID).firstChild;
# range.setStart(textNode, N); range.setEnd(textNode, M);