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fix(bulma-ui): a compound matches one simple selector, not co-occurrence - #703
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Last commit's index keyed one entry per comma-separated part, so all the classes in a descendant selector counted as one set: `.hero.is-primary .tabs` answered the query `tabs.is-primary` against a stylesheet with no such rule. That is the silent direction, a dead modifier reading as live, which is a missed defect rather than a false alarm. Parts are split into simple selectors on the combinators now, and the class set has to match the query exactly, so a rule needing a third class no longer answers for two either. Order still does not matter, which is the point of the previous fix: Bulma writes both `.notification.is-primary` and `.is-primary.input`. Measured before and after rather than reasoned about, and the honest result is narrower than the finding suggests: across the fifty-seven pairs this guard actually queries, the broken index and the fixed one agree on every one. The spurious answers are real and they are in elements this file never asks about. Exact matching and order-independent matching also agree on all fifty-seven, and both correctly answer false for `.timeinput-wheel` and `.tabs`. The literal readers accepted single quotes only. A double-quoted component name failed loudly through the call count, but a double-quoted `extraUnstyled` entry read as no extras with nothing counting it, and the inline-list check is satisfied by a double-quoted array. Both styles now. Prettier is what kept this from biting, which is not a guarantee. And the measurements came out of the comments. That is the third time this file has grown point-in-time evidence and the third time a review has had to say so; the rationale survives without the numbers.
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe script strengthens CSS bracket and selector scanning, adds shared quoted-value matching, expands regression coverage, and requires standalone stylesheet rules for shade and keyword validation. ChangesCSS parsing and extraction
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Inline comments:
In `@scripts/color-tuple-css.test.mjs`:
- Line 151: Update the simpleSelectors class-set construction and related
shipsClass logic to parse functional pseudo-classes according to selector
semantics: represent :not() arguments as exclusions, and treat :is() and
:where() arguments as alternative branches rather than unconditional classes.
Support nested functional arguments and selector lists while preserving ordinary
class extraction.
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Raised by CodeRabbit on #703. The class extraction read every `.name` in a simple selector, including the ones inside `:not(…)`, which name classes the element must NOT carry. So `.notification:not(.is-light)` would answer the query `notification.is-light`: a rule that explicitly excludes the pair reporting it as live, which is the silent direction this PR exists to close. Measured before changing it, and it affects nothing today: 201 simple selectors carry a functional pseudo-class and none of them also carries a colour modifier, so no answer changes. Latent, and worth fixing because it is the same shape as the defect the PR is for. `:is()` and `:where()` are deliberately left alone. Their classes are alternatives rather than requirements, so counting them makes the exact match demand too many classes and under-report, which is the safe way to be wrong; treating them properly means modelling branches, which is more parser than this file should carry.
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Taken, with the measurement.
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Inline comments:
In `@scripts/color-tuple-css.test.mjs`:
- Line 158: Update the selector normalization around the matchable
transformation to scan and remove balanced :not() functional arguments,
including nested pseudo-functions such as :is(), before extracting classes.
Preserve existing behavior for other selectors and add a regression case
covering the nested :is() example so an exact compound query cannot match
without its full required classes.
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Deep review — 1 blocking · 3 advisory
| # | Severity | Area | Finding | Location |
|---|---|---|---|---|
| 1 | 🟡 Minor | Correctness | The :not() strip runs after the comma split, so .navbar-item:not(.is-active,.is-selected) — the only multi-argument :not() in the shipped stylesheet — still contributes is-active as a class the element carries |
scripts/color-tuple-css.test.mjs:146-164 |
| 2 | 🔵 Advisory | Robustness | Four extractors became quote-agnostic (/['"]([^'"]+)['"]/) but cssBackedColors() still reads single-quoted only, so five readers of the same kind of literal no longer fail the same way. Prettier enforces single quotes repo-wide, so none of the five needed the change |
scripts/color-tuple-css.test.mjs:415 |
| 3 | 🔵 Advisory | Correctness | An escaped class name tokenises as two classes — .is-gap-0\.5 yields {is-gap-0, 5} — so the new exact-size rule is sensitive to a tokenisation the coarse index could ignore. Harmless for every query this file makes (<element>.is-<colour> and single has-* classes), and the direction is under-reporting |
scripts/color-tuple-css.test.mjs:162 |
| 4 | 🔵 Advisory | Performance | The class index is gone; shipsClass now scans all 7,275 simple-selector sets per query. Measured: 19 ms to build, ~0.1 ms per miss, 1.5 s for the whole file (case 1's 1.09 s is dominated by extractComponent, not the matcher). Fine today; the headroom the previous round bought is spent |
scripts/color-tuple-css.test.mjs:120-130 |
Overall: The change is sound and the diagnosis is right — I reproduced both halves against the real bulma-ui/dist/bestax.css: tabs.is-primary now answers false where the per-part index answered true, and the 57 (element, colour) pairs this guard queries are unchanged, so the PR body's measurement holds. The riskiest part is the :not() handling added in 1ba7bdf8: it is correct for 35 of the 36 :not() forms in the stylesheet and wrong for the one that contains a comma, because the strip is applied to a fragment the comma split has already broken. Look at finding 1 first — the suggested hoist to the prelude is a three-line change, fixes the combinator variant at the same time, and leaves all four cases passing.
Residual risk:
:not()with a comma or a combinator inside — open, posted as finding 1. One instance in the stylesheet today, latent because neither class is a colour.:is()/:where()counted as required classes — refuted: zero occurrences inbulma-ui/dist/bestax.css, and the documented direction (demand too many → under-report) fails loudly in thedead-set equality rather than silently.- A live modifier reading dead under the new exact-size rule — refuted: every
.notification.is-<colour>and.progress.is-<colour>rule ships as a bare two-class compound, and where a third class exists (.notification.is-primary.is-light) the bare form ships alongside it. Pseudo-elements (.progress.is-primary::-webkit-progress-value) contribute no extra class, so the size stays 2. - Parse hazards in the prelude extraction — refuted by enumeration: no
}inside anycontent:string, no attribute selector containing a space, comma or combinator ([data-theme=light],[tabindex="0"], …), no:nth-*()with internal spaces. - The quote-class widening pairing a
'with a"— not reachable: the four call sites read colour tuples andwarnUnstyledColorarguments, all prettier-normalised single quotes with no apostrophes inside.
🏄 Two clean rides in a row, dude — first the compound match, then the
:not()cleanup, and both measured against the real wax instead of argued. There's one little closeout left where a comma splits the barrel before the strip can see it; patch that and this one's totally good to paddle out on.
The `:not()` strip ran after the selector list was split on commas, and the
arguments can contain commas: `.navbar-item:not(.is-active,.is-selected)` is
one selector, so splitting first fragments it and leaves `is-active` looking
like a class the element carries. The strip then finds no closing paren and
matches nothing. Stripping before any splitting solves the ordering and the
comma at once.
Measured, because the obvious check does not show it: `navbar-item` with
`is-active` answers true either way, since a real `.navbar-item.is-active`
rule also exists. What changes is the contribution — seven exact
`{navbar-item, is-active}` sets before, five after — and across the
stylesheet ten compound pairs existed ONLY inside a pseudo-class argument and
now correctly do not, among them `navbar-link` with `is-arrowless` and
`title` with `is-spaced`. No answer this guard queries moves, so it is latent
here as well.
The strip now takes `:is()` and `:where()` arguments too, which the previous
version deliberately kept. Dropping them makes the exact match demand fewer
classes than the selector needs and under-report, which is the safe way to be
wrong, and it is what lets one rule handle the comma problem for every
functional pseudo-class rather than only `:not()`.
`cssBackedColors()` was the one literal reader left single-quoted after four
others were widened. Prettier enforces single quotes repo-wide so none of the
five needed it, but five readers of the same kind of literal should fail the
same way.
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deep-review: fresh — please read 6a2daea |
…eparator
Bulma spells the fractional gap helpers with an escape: `.is-gap-0\.5` is one
class called `is-gap-0.5`. The tokeniser stopped at the backslash and then
matched the escaped dot as if it began a second class, so that selector
entered the index as `{is-gap-0, 5}` — a class the stylesheet does not have,
and a set one element wider than the selector it came from.
Twenty-four selectors carry an escape and all twenty-four change. None of the
234 element-and-colour answers this guard asks moves, because no element name
and no colour modifier is escaped, so this is latent like the last one. It is
still worth fixing: the exact-size check is the whole mechanism here, and a
tokeniser that invents an extra class is the one input that quietly defeats
it.
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Deep review — 1 blocking · 3 advisory
| # | Severity | Area | Finding | Location |
|---|---|---|---|---|
| 1 | 🟡 Minor | Correctness | Stripping :is()/:where()/:has() arguments shortens the stored class set, so an exact match answers a shorter query — .notification.is-primary:where(.is-light) reports notification.is-primary as live. That is over-reporting, the silent direction, and it reverses the direction 1ba7bdf8 had right |
scripts/color-tuple-css.test.mjs:157-165 |
| 2 | 🔵 Advisory | Correctness | An escaped class name tokenises as two classes — .is-gap-0\.5 yields {is-gap-0, 5} — so the exact-size rule sees a compound that does not exist. Differenced against a css-tree ground truth over the whole stylesheet, these escapes are one of only two sources of disagreement, and none of the names involved is ever queried |
scripts/color-tuple-css.test.mjs:170 |
| 3 | 🔵 Advisory | Correctness | Comments are never stripped from a prelude, so the minireset.css banner and the trailing sourceMappingURL comment contribute class sets: {com, css}, {css, map}, {0, 6}. Inert — none is a queryable class — and pre-existing rather than introduced here |
scripts/color-tuple-css.test.mjs:163-165 |
| 4 | 🔵 Advisory | Performance | shipsClass scans all 7,271 simple-selector sets per query; the first case runs in ~0.8 s locally. Fine today, and unchanged by this commit — the class index went in the previous round |
scripts/color-tuple-css.test.mjs:120-130 |
Overall: The head commit is right about both things it set out to fix, and I confirmed them empirically rather than from the diff: hoisting the strip above prelude.split(',') makes .navbar-item:not(.is-active,.is-selected) — the one multi-argument :not() in the built stylesheet — stop contributing is-active, which closes the finding the previous round left open, and it also protects :has(+.subtitle) and :nth-child(even) from the combinator split. I built bulma-ui/dist/bestax.css and differenced the matcher against a css-tree selector-parser ground truth over every single-class query (3,548 classes) and every 2-class compound present in either index: zero disagreements outside the escape and comment artefacts in rows 2 and 3, and all four cases pass. The one thing to look at is finding 1 — widening the strip from :not() to every functional pseudo-class was the cheap way to get the comma fix, but it also drops classes that add a requirement, and the justifying comment states the resulting direction backwards; the suggested two-line change keeps the comma fix and puts the wrongness back on the loud side, with no answer in the current stylesheet moving.
Residual risk:
- A compound that exists only inside a
:not()argument — refuted: I enumerated all 262:not()occurrences and 36 distinct forms; the strip now removes every one of them before either split, andnavbar-link/is-arrowlessandtitle/is-spacedno longer contribute. - A functional pseudo-class that adds a required class — open, posted as finding 1. Zero
:is()/:where()in the built stylesheet, but four:has()selectors ship and two of them come frombulma-ui/src/scss/form/_timeinput.scss, so the shape is ours to grow. - Nested parentheses inside a pseudo-class argument (
:not(:is(.a))) — refuted: zero occurrences;[^()]*matches the inner call first, leaving an empty:not()and no class, so the direction stays under-reporting. - A live modifier reading dead under the exact-size rule — refuted by the differential: single-class answers agree with
css-treeon all 3,548 classes, and the only 2-class disagreements are the escape and comment artefacts above. - Declaration text leaking into a prelude — refuted: no
{inside any string orurl()in the stylesheet, and no attribute selector contains a space, comma, combinator or dot, solastIndexOf('}')and the combinator split both stay on selector text. - The quote widening pairing a
'with a"— refuted: the scanned sources hold four double quotes between them, one anaria-labeloutside any call text and three inside template literals in the warning message, all afterconst CSS_BACKED =, whichcssBackedColors()reads with a first-matchexec. Every one of the five readers returns the same values before and after.
🏄 Third set wave and the cleanest of the three, brah — hoisting that strip above the comma split was the right line to take, and the closeout that got you last round is fully behind you now. Only thing left is that
:is()/:where()/:has()drop: it's paddling the wrong way down the face, quiet-like. Two lines and you're back in the pocket.
Widening the strip from `:not()` to every functional pseudo-class was the cheap way to get the comma fix, and it bought that at the cost of the property the matcher is built on. `:not()` is a prohibition, so the rest of the selector already names everything the element carries and deleting the argument is right. Everything else ADDS a requirement, and deleting the argument shortens the class set: `.notification.is-primary:where(.is-light)` needs three classes, and a two-class set answers the two-class query `notification.is-primary` as live. That is precisely the over-reporting the exact-size rule exists to stop, so the previous commit removed the guard's own defence, and its comment claimed the opposite direction. Those selectors now leave a sentinel class behind, so the set grows instead of shrinking and the query reads dead. A false alarm is the one way this guard may be wrong. Comments are removed before the stylesheet is split. Their words were entering the index as classes, which is inert for the ones that ship today but is the same over-reporting shape: a comment quoting a compound answers for it. The matcher now has a test of its own, on selectors written for the purpose rather than on whatever Bulma happens to write. Every finding this file has taken has been a matcher bug rather than a library one, and each surfaced by measuring the built stylesheet, which can only cover the shapes already in it. Two of the four `:has()` selectors that ship come from our own SCSS, so this shape is ours to grow, and there is no `:is()` or `:where()` yet at all. Reverting each of the three behaviours separately fails the new test on that behaviour's own assertion, so none of them is carried by another. No answer moves. The six selectors that gain a sentinel are structural, the element-and-colour pairs are unchanged, and the only single-class answers that change are the words that were coming out of the comments.
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Round 2 handled. Findings 1, 2 and 3 are fixed at 1 (blocking) — fixed, and you were right about the direction. The strip now branches: The three shapes now behave as you asked, checked against the previous matcher:
Six selectors in the built stylesheet gain a sentinel, all structural. No element-and-colour answer moves. 2 — fixed. Escaped names are read whole, so 3 — fixed. Comments are removed before the split. The five single-class answers that change are exactly the words that were coming out of the banner and the sourceMappingURL. 4 — refuted, and I think the cost is attributed to the wrong thing. The scan is not what the first case spends its time on:
The first case is ~340 ms because One addition that is not a finding: the matcher now has a test of its own, on selectors written for the purpose. Every finding this file has taken has been a matcher bug rather than a library one, and each was found by measuring the built stylesheet, which only covers the shapes Bulma writes today. There is no |
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deep-review: fresh — please read f395e76 |
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Deep review — 2 blocking · 2 advisory
| # | Severity | Area | Finding | Location |
|---|---|---|---|---|
| 1 | 🟡 Minor | Correctness | Only parenthesised requirements get a sentinel: :first-child, :hover, ::before and [attr] leave the set untouched, so .notification.is-primary:first-child answers notification.is-primary live while the assertion added in this very commit requires :nth-child(even) to answer dead. Same requirement, opposite answers, and the live one is the silent direction. |
scripts/color-tuple-css.test.mjs:196 |
| 2 | 🟡 Minor | Correctness | [^()]* cannot cross a parenthesis and replace does not re-scan its own output, so a nested :not() empties the pseudo-class enclosing it and no sentinel lands: .notification.is-primary:has(:not(.is-light)) answers notification.is-primary live. The set shrinks back to the size of the query — the exact inversion the commit message forbids. |
scripts/color-tuple-css.test.mjs:191 |
| 3 | 🔵 Advisory | Robustness | The UNMODELLED doc comment credits assertUnmodelledIsUnused with holding the name to being absent from the stylesheet. No such function exists — the check is an inline assert.ok at the top of simpleSelectors. Deleting the name leaves the sentence true. |
scripts/color-tuple-css.test.mjs:148 |
| 4 | 🔵 Advisory | Robustness | Point-in-time evidence is back in the comments — the minireset banner and sourceMappingURL contributing a com, css set, and two of the four :has() selectors coming from our own SCSS. Both are counts of a stylesheet that changes on every Bulma bump; the same paragraph in the commit message says six selectors gain a sentinel, which is seven distinct and fourteen occurrences at this SHA. Move them to the issue and link it — the rationale survives without the numbers. |
scripts/color-tuple-css.test.mjs:161, :468 |
Overall: the direction this commit restores is right, and it is the correct reading of the round before it — :not() is the only functional pseudo-class whose argument may be deleted, and making every other one grow the class set is the conservative choice this guard is built on. I rebuilt bulma-ui and ran the file: 5/5 pass, prettier and eslint clean, and I confirmed independently that the two threads the prior reviews left open are genuinely closed at this SHA (replied to and resolved). The riskiest part is that the sentinel covers less than the comment above it claims: it fires only on a pseudo-class written with parentheses, so the reasoning the new :nth-child(even) assertion codifies never reaches :first-child, :hover, ::before or [disabled]. Look at finding 1 first — it is where the file contradicts itself inside a single commit.
Residual risk:
- Unparenthesised requirements — open, posted as finding 1. 732 of the 7277 index sets carry one today; 0 of the 57 element-and-colour pairs this guard queries is answered live only through such a selector, so it is latent, and the suggested fix moves no answer.
- Nested-paren functional pseudo-classes — open, posted as finding 2. Refuted as a present-day miss: the built stylesheet has four
:has()selectors, every argument flat, and zero:is()or:where(). Reachable only through SCSS we would write ourselves. :not()arguments reaching the extractor — refuted. I re-enumerated every functional pseudo-class indist/bestax.css; the strip runs on the prelude before the comma and combinator splits, so.navbar-item:not(.is-active,.is-selected)no longer fragments, and the new test pins it.- Attribute selectors injecting a class — refuted. An attribute selector whose value contains a dot would put that name in the set; zero attribute selectors in the shipped stylesheet contain one.
- Comment strip eating real code — refuted for the stylesheet as it ships: no quoted
contentvalue carries a comment opener and no data URI carries a literal brace, so the strip removes only comments. Same class of textual limitcodeOnlyalready documents for the source scan. - Escaped-dot tokenising — refuted. 24 escaped selectors, all of them fractional gap helpers; the character class plus the unescape reads each as one class, and both directions are pinned by the new test.
- Sentinel collision — refuted.
simpleSelectorsasserts the name is absent from the stylesheet before indexing, and adding the sentinel to a set can never satisfy a query: no query names it, and single-class lookups test membership rather than size.
🏄 Fourth set on the same wave and the line is finally clean — the matcher only wipes out in the safe direction now, and it paddled out with its own test instead of trusting whatever Bulma sends. Couple of little rocks still under the surface where a pseudo-class forgot its parentheses; patch those and it is a straight ride to shore.
The sentinel only fired on a pseudo-class written WITH parentheses, so the same commit that asserted `:nth-child(even)` makes a compound read dead answered `:first-child` live. `:hover` and `[disabled]` were in the same position. Every one of them narrows which elements carrying those classes match, which is the thing the exact-size rule has to count, and the parenthesised half of that set was the only half being counted. A pseudo-ELEMENT is the exception and stays live. `.delete::before` styles a box generated for a delete, so the delete renders; treating it as a requirement would call it dead, which is not a conservative reading but a wrong one. Arguments now resolve to a fixed point. `[^()]*` cannot cross a parenthesis and `replace` does not re-scan its own output, so one pass over `:has(:not(.is-light))` resolved the inner call and left an empty `:has()`. The leftover is caught by the bare pass either way; what needs the loop is `:not(:is(.is-light))`, where the inner call has to resolve BEFORE the `:not` around it can drop, or a prohibition reads as a requirement. Each pass removes at least one pair of parentheses, so it ends. Attribute selectors are handled before bare pseudo-classes, because an attribute value may contain a colon. The prelude normaliser moves into a named function, since the reasoning about what may drop, what must grow, and why the order is what it is had outgrown a comment inside a loop body. Nothing moves again: no element-and-colour pair changes, and no single-class answer changes. Reverting each of the five behaviours separately fails the test on that behaviour's own assertion, so none is carried by another — the nested-argument case needed a compound query to pin at all, because a single-class query cannot tell the loop from the pass that follows it. Also drops two counts of the stylesheet that had gone back into the comments, and a reference to a function that does not exist.
…nores The escape step in the new balanced scan had nothing holding it, and it is the one behaviour on this branch that changes an answer rather than losing one: without it `selector(.a\)b)` closes on the escaped parenthesis and the class comes back as `a` instead of `a)b`. A name changed is what no other case here can see, since every other case asks about a name being present or absent. Both case-insensitivity flags were unheld too — the gate that decides whether a prelude is read, and the lookup that finds the function inside it — so `@SUPPORTS SELECTOR(.x)` would have lost its name to either. And the docblock was wrong about a nested grouping paren. `((selector(.a)))` is reached and harvested, because the scan looks for the function wherever it sits rather than at a fixed depth. What goes wrong instead is one loss and one fabrication, and both are named there now: an escaped spelling of the function matches nothing, so those names are lost, and a comment inside a condition survives the strip by design, so `selector(.fake)` written in one is read and that name is invented. Reading the first means decoding identifiers and avoiding the second means parsing comments the scan deliberately leaves alone.
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| true, | ||
| 'CSS does not care how either of these is cased, so neither the ' + | ||
| 'gate nor the function lookup may.' | ||
| ); |
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The prelude path has THREE case-insensitivity flags and this commit pins two — the unheld one is the branch whose loss is quiet — 🟡 Minor · Coverage
What: the commit message says "Both case-insensitivity flags were unheld too — the gate that decides whether a prelude is read, and the lookup that finds the function inside it". There is a third on the same path: SCOPE_AT_RULE = /^@scope/i (line 227), the branch that decides whether the WHOLE prelude is a selector list or only a selector(…) condition. This case holds SELECTOR_PRELUDE's i and the i on /selector\(/gi, and no case anywhere in the file spells @scope in anything but lower case — so deleting that flag changes an answer and the suite stays green.
Why it matters: it changes it in the direction this file forbids. With /^@scope/ (no i), @SCOPE (.the-root) still passes the gate — SELECTOR_PRELUDE keeps its own i — and then falls to the selectorConditions branch, which finds no selector( in a scope prelude, returns '', and harvests nothing. The scope root drops out of the membership index under a name nobody queries: a class the stylesheet ships going missing, which is the first defect this file was written for and the exact loss aaa27505 added the branch to close. The two flags this commit does pin both fail loudly by comparison — they lose a @supports name, and no stylesheet this repo builds carries @supports at all.
Traced through the current code
heading = '@SCOPE (.the-root)'
| step | with /^@scope/i |
with /^@scope/ |
|---|---|---|
heading.startsWith('@') |
✓ | ✓ |
SELECTOR_PRELUDE.test (has its own i) |
✓ | ✓ |
SCOPE_AT_RULE.test |
✓ | ✗ |
prelude |
@SCOPE (.the-root) |
selectorConditions(…) → '' |
names |
the-root |
— |
live(…, 'the-root') |
true |
false |
Fix: one assertion next to the @SUPPORTS one, on the branch that has no case of its own.
| ); | |
| ); | |
| assert.equal( | |
| live('@SCOPE (.the-root){.box{color:red}}', 'the-root'), | |
| true, | |
| 'and the branch that decides a scope prelude is read WHOLE is cased ' + | |
| 'the same way, so its flag needs holding too — without it the root ' + | |
| 'falls to the feature-query branch, which finds no `selector(` and ' + | |
| 'harvests nothing.' | |
| ); |
Two siblings of the same shape, worth folding into the same change rather than a second round: TRANSPARENT_AT_RULE's i (no case spells @LAYER; losing it reads a layer as a condition, which is the allowed direction) and NUMERIC_ESCAPE = /\\[0-9a-f]/i (both escape cases spell \3, a digit, so the i is unheld — an escape opening on an upper-case hex letter, .\B0 x, would stop halting and rename the class quietly, which is not the allowed direction).
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Deep review — 1 blocking · 3 advisory
| # | Severity | Area | Finding | Location |
|---|---|---|---|---|
| 1 | 🟡 Minor | Coverage | The prelude path has three case-insensitivity flags and this commit pins two. SCOPE_AT_RULE's i is unheld, and deleting it drops a @SCOPE root out of the membership index silently — the forbidden direction, unlike the two that are pinned |
scripts/color-tuple-css.test.mjs:227 |
| 2 | 🔵 Advisory | Correctness | shipsClass's comment names the shade deepEqual as a caller that "fails loudly on a yes it should not have been given"; two other comments in the same file (:762, :570) name that same comparison as the one place a bad yes is quiet. The over-broad clause is the justification for widening the membership path |
scripts/color-tuple-css.test.mjs:152 |
| 3 | 🔵 Advisory | Robustness | selectorConditions finds the function by the literal substring selector(, so it also fires on a longer identifier ending in it (x-selector(.fake)) and fabricates that name. The docblock names two shapes that go wrong; this is a third |
scripts/color-tuple-css.test.mjs:590 |
| 4 | 🔵 Advisory | Robustness | withoutAttributes's "or to the end if it never comes" branch is unreachable: a heading sits between two depth-zero delimiters, and nonStructure asserts brackets balance as they go, so an unterminated [ stops the guard before this code runs. The comment describes a loss that cannot happen |
scripts/color-tuple-css.test.mjs:676 |
Overall: The change is sound and the direction is right — every fix on the branch moves an answer off the silent side (a compound reading live when nothing renders) onto the loud one, and the exact-size rule plus the UNMODELLED sentinel is a coherent mechanism rather than a pile of special cases. I traced the whole matcher by hand — nonStructure's depth scan, the brace stack, requirements' one-pass argument resolution, classesOf's qualifier residue, withoutAttributes, and the new balanced selectorConditions — and could not construct a selector the matcher calls live that a browser would not render; the paths I probed (escaped combinators and commas in class names and attribute values, ~=/*= operators, custom-property blocks, keyframe percentages, statement at-rules, stray closers) all land on the false-alarm side. The riskiest part is not the code but the claim above it: this file's value is entirely in "every behaviour that can change an answer is held by a case", and the one gap I found is in exactly the area 5557f53a set out to close, so that is what to look at first.
Residual risk: for the failure class this PR addresses — a compound reading live when nothing renders, and a shipped class going missing from the membership index:
- Unheld regex flags.
SCOPE_AT_RULE'siis posted as finding 1;TRANSPARENT_AT_RULE'si(no case spells@LAYER) andNUMERIC_ESCAPE'si(both escape cases spell a digit, so an escape opening on an upper-case hex letter would stop halting) are named there too. Open. - A prefix-fused function name in a feature query —
@supports x-selector(.fake)harvestsfake. Fabrication rather than loss, so it is loud everywhere except the shade comparison, and no stylesheet this repo builds carries@supportsat all. Same accepted class as the comment-inside-a-condition case the docblock already names. Advisory row 3. - An unterminated string drops its terminating line break from
out— the closing quote is replaced by the second emitted delimiter, but a line-feed, carriage-return or form-feed terminator is consumed and emitted as nothing. Refuted as a live-reading risk: fusing across the gap can only join two simple selectors into one, which raises the class count, and the contextual sentinel it loses is lost only by growing the set past the size any query asks for. A string can reach a selector heading only inside brackets, which trips the balance assertion first. - Braces are not balance-checked the way brackets are —
open.pop()on an empty stack is a silent no-op, so a stray}un-nests everything after it. Refuted: a browser un-nests at the same character, so the reading agrees with what renders. classesOfdoes not applyIDENTIFIER_START, so a keyframe percentage contributes a set containing the name3. Refuted: the qualifier residue sentinels that set, and no query this file asks is spelled from a digit.- The compound path scans every subject set per query rather than the old per-class index. Refuted as a regression risk: the callers issue on the order of a couple of hundred compound queries against a single cached index.
Empirical note for the maintainer: node execution was not available to me in this environment, so I verified against the check runs on 5557f53a — Build and Test, both React majors and CodeQL all green, the ONLY_CLASSES alert cleared — plus a hand trace of each new assertion in both directions, rather than by running node --test myself. The finding above was derived by tracing, not by executing a mutant.
🏄 Thirty-five commits of paddling back out after every wipeout, and the break finally reads clean — this thing knows the difference between a wave and a shadow now. One little flag still out there surfing unsupervised, but otherwise it's good to go, brah.
…has a case `selectorConditions` found its function by substring, so it also fired on the tail of a longer identifier: `x-selector(.fake)` is not a selector condition and reading it as one invented that name. It matches at a boundary now, which makes it the third shape on that path to be fixed rather than accepted. Every keyword on this path is case-insensitive in CSS, and five places read one: the gate that admits a prelude, the lookup that finds the function inside it, the test that decides which half of the pair it is, the transparent at-rule, and the escape the guard refuses to decode. Two had cases. All five do now — an upper-case scope root was dropping out of the membership index, an upper-case layer was reading as a condition, and an escape opening on an upper-case hex digit was not stopping the guard. `shipsClass` claimed every caller of the membership path fails loudly on a yes it should not have been given, and two other comments in the same file name the shade comparison as the one place such a yes is quiet. Those two are right: that comparison is between two computed lists, so a fabricated name can make an equality hold that should have failed. It is what bounds the widening, so it now says which caller runs which way and why every source of a fabricated name is enumerated rather than waved at. And a comment in `withoutAttributes` described a loss that cannot happen. Its unterminated-bracket branch is unreachable: braces inside brackets are neutralised, so a bracket span never crosses a block boundary, and balance is asserted as it goes, so such a stylesheet stops the guard before a heading is read at all.
|
deep-review: fresh — please read b4e0377 |
Preview DeploymentPreview URL: https://2f76cad7.bestax.pages.dev |
| if (ch === '(' || ch === '[') depth += 1; | ||
| else if (ch === ')' || ch === ']') { | ||
| if (depth === 0 && stray < 0) stray = i; | ||
| depth -= 1; | ||
| } |
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One counter for two bracket kinds, so a ] closes a ( and the span between reads at depth zero — 🟡 Minor · Correctness
What: ( and [ both increment the same counter and ) and ] both decrement it, so the scan never checks that a closer matches its opener. foo(] balances. From that point the text is read one bracket too shallow, which is exactly the failure the stray tracker two lines below was added to catch — but neither assert fires, because the counts net out and never go negative.
Why it matters: a } inside a function's parentheses comes back as block structure, which pops the stack and hands a nested compound the top level. That is the direction this file forbids. Verified on the current HEAD:
shipsClass('.hero{a:foo(]}.notification.is-primary{color:red}[)}', 'notification.is-primary')
// → truePer CSS the ( opens a simple block that ends at the ), so .notification.is-primary{color:red} is inside a declaration value and renders nothing at all. The correctly-nested control answers dead, as it must:
shipsClass('.hero{a:foo(x}.x.y{color:red})}', 'x.y') // → falseThe same conflation is what makes the withoutAttributes loop bound this commit re-documented (line 688) reachable, rather than "defensive rather than a case anything reaches": .a[b) balances too, so withoutAttributes('.a[b)') returns '.a' and c drops out of the membership index —
[...simpleSelectors('.a[b).c{color:red}').names] // → [ 'a' ]Why the two asserts miss it
graph LR
A["( → depth 1"] --> B["] → depth 0"]
B --> C["} read as block structure<br/>stack pops .hero"]
C --> D[".notification.is-primary<br/>indexed as top level"]
D --> E["[ → depth 1"]
E --> F[") → depth 0<br/>net balanced, never negative"]
stray only fires on a closer at depth 0; the final assert.equal(depth, 0) only fires on a non-zero net. A matched count with mismatched kinds passes both.
Fix: keep the opener, not just a count — then a mismatched closer is a stray, and the withoutAttributes comment becomes true as written.
let out = '';
- let depth = 0;
+ // The opener itself, not just a count: a `]` does not close a `(`, and
+ // one counter for both let `foo(]` balance, so the span after it was
+ // read at depth zero and a brace inside a function came back as
+ // block structure.
+ const open = [];
let stray = -1;
@@
- if (ch === '(' || ch === '[') depth += 1;
- else if (ch === ')' || ch === ']') {
- if (depth === 0 && stray < 0) stray = i;
- depth -= 1;
- }
+ if (ch === '(' || ch === '[') open.push(ch);
+ else if (ch === ')' || ch === ']') {
+ if (open[open.length - 1] !== (ch === ')' ? '(' : '[')) {
+ if (stray < 0) stray = i;
+ }
+ open.pop();
+ }
// A brace or semicolon inside either kind of bracket is content. Held
// as a space so the text keeps its length and nothing fuses across it.
- else if (depth > 0 && (ch === '{' || ch === '}' || ch === ';')) {
+ else if (open.length > 0 && (ch === '{' || ch === '}' || ch === ';')) {
@@
assert.equal(
- depth,
+ open.length,
0,and a case apiece, both currently answering the forbidden way:
assert.throws(
() => live('.hero{a:foo(]}.notification.is-primary{color:red}[)}',
'notification.is-primary'),
/never opened/,
'a `]` does not close a `(`, and counting both in one depth reads the ' +
'span between them one bracket too shallow.'
);
assert.throws(
() => live('.a[b).c{color:red}', 'a'),
/never opened/,
'and the same mismatch is what reaches the bound on the attribute ' +
'skip, which loses every name after it.'
);
| .replace(/:([a-z-]+)\(([^()]*)\)/gi, (_, name, argument) => | ||
| name.toLowerCase() === 'not' && onlyClasses(argument) |
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Three more keyword case-folds, all in requirements, and none of them is held by a case — 🟡 Minor · Coverage
What: this commit finishes the case story on the prelude path (five flags, five cases). requirements reads three keywords of its own and every one of them is unpinned. Deleting each in turn leaves node --test scripts/color-tuple-css.test.mjs fully green, while each changes an answer:
| mutation | probe | today | mutant |
|---|---|---|---|
/:([a-z-]+)\(([^()]*)\)/gi → /g (line 383) |
rendersAlone('.a:Not(.b){color:red}', 'a') |
true |
false |
name.toLowerCase() === 'not' → name === 'not' (line 384) |
same | true |
false |
/::[a-z-]+/gi → /g (line 403) |
rendersAlone('.delete::BEFORE{content:""}', 'delete') |
true |
false |
Why it matters: all three fail toward a false alarm, which is why this is Minor and not the forbidden direction — but the PR body states that "Every behaviour in the matcher that can change an answer was reverted separately, and each fails the suite on its own assertion", and names only three exceptions (the doubled string delimiter, the space left by a neutralised delimiter, the emptiness guard in onlyClasses). These three are neither pinned nor named, so the claim does not hold as written and a later edit can drop any of them silently. The third is the more costly one to lose: ::BEFORE reverting to a requirement turns a live .delete into a dead one in rendersAlone, which is the assertion that helper classes MUST ship.
Fix: three assertions next to the existing pseudo-element and prohibition cases.
// CSS does not care how a pseudo-class or a pseudo-element is spelled,
// and three readings here do: the call that finds a functional
// pseudo-class, the test that decides whether it is the prohibition,
// and the pseudo-element pass.
assert.equal(
alone('.a:Not(.b){color:red}', 'a'),
true,
'a prohibition is a prohibition in any case, or the call is missed ' +
'and then refused as a requirement it is not.'
);
assert.equal(
alone('.delete::BEFORE{content:""}', 'delete'),
true,
'and a pseudo-element restricts nothing however it is cased, or the ' +
'helper that must ship reads as though it does not.'
);(the first covers both line 383 and line 384 only if they are reverted one at a time — a separate case with an upper-case non-not call, e.g. alone('.a:IS(.b){color:red}', 'a') answering false, distinguishes them.)
|
deep-review: fresh — please read b4e0377 |
| // arguments wholesale — a class the stylesheet names only in a | ||
| // `:not()` is still a class it names, and the membership path is the | ||
| // one place that matters. | ||
| for (const [, name] of selectorText.matchAll(CLASS_TOKEN)) { |
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A comment inside a selector's parentheses survives into the heading and fabricates a class name — 🟡 Minor · Correctness
What: nonStructure only recognises a comment opener at depth 0 (line 503), so a /* … */ written inside a functional pseudo-class keeps its text verbatim. That text reaches this tokeniser, and any .name in it becomes a name the membership index reports the stylesheet as knowing. Verified on this HEAD:
[...simpleSelectors('.button:not(/* .is-static */ .is-loading){color:red}').names]
// → [ 'button', 'is-static', 'is-loading' ]
shipsClass('.box:is(/* .has-text-white-bis-15 */ .a){color:red}', 'has-text-white-bis-15')
// → true[data-x=/*.attrfake*/y] does not fabricate (the attribute strip removes it) and a comment at depth 0 does not either — it is specifically a comment inside parentheses in a selector.
Why it matters: this is a fabricated name on the membership path, and b4e03778 added the comment at lines 160–168 that names the one caller which is quiet on a bad yes — the shade deepEqual, where an extra entry on the left can make an equality hold that should have failed. The second probe above is exactly that shape: a commented-out class spelling a shade class makes shipsClass answer live for a class the stylesheet does not ship. The same comment claims the enumeration is complete — "declaration text is cut at the semicolon, attribute values are stripped, at-rule conditions are not harvested, and a token that cannot be an identifier is refused. What is left is named where it happens, in selectorConditions" — and this is a fifth source it does not name. It is also the shape a hand-written SCSS author actually produces: commenting one class out of a :not() list.
The sets path is safe: onlyClasses rejects the comment residue, so the selector reads dead — the allowed direction. Only names is affected.
Why the existing acknowledgement does not cover it
nonStructure's docblock (lines 471–479) already says the depth-0 restriction is "wrong inside rgb(), calc() or :is()", but states the consequence as loud: "A comment inside parentheses carrying an odd quote or an unmatched bracket therefore stops the guard rather than being ignored, which is loud." That is true only of a comment carrying an odd quote or bracket. A benign comment is silent, and silent is the direction this file forbids.
graph LR
A["( → depth 1"] --> B["/* not consumed<br/>(depth != 0)"]
B --> C["text kept verbatim"]
C --> D["heading reaches CLASS_TOKEN"]
D --> E["names.add('has-text-white-bis-15')"]
E --> F["shade deepEqual holds<br/>on a divergence"]
Fix: the file's established answer for a shape it cannot read is to stop rather than guess, and by this point a /* in a heading can only have come from inside parentheses — depth-0 comments are already gone. One assert next to the numeric-escape one, before the harvest:
assert.ok(
!NUMERIC_ESCAPE.test(selectorText),
`the selector \`${heading}\` carries a numeric escape, which this ` +
'file reads as a single character and would silently rename. ' +
'Teach it CSS identifier decoding in the same change that ' +
'introduced the escape.'
);
+
+ // A comment at depth zero is already gone, so one still here sat
+ // inside parentheses, where the scan reads it as content — right for
+ // a url token, wrong for `:is()`, where CSS does allow one. Its words
+ // reach the tokeniser below and a `.name` in them becomes a class the
+ // stylesheet does not ship. That is quiet in the shade comparison, so
+ // it stops rather than guesses.
+ assert.ok(
+ !selectorText.includes('/*'),
+ `the selector \`${heading}\` carries a comment inside parentheses, ` +
+ 'which this scan reads as content, so a class named in it would ' +
+ 'register as one the stylesheet ships.'
+ );and a case on the side it is wrong on:
assert.equal(
live('.box:is(/* .the-fake */ .a){color:red}', 'the-fake'),
false,
'a class commented out of a selector is not a class the stylesheet ' +
'ships, and the scan cannot see a comment inside parentheses — the ' +
'one fabricated name the enumeration above does not account for.'
);(with the assert above, spell this as an assert.throws(…, /comment inside parentheses/) instead.)
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Deep review — 3 blocking · 4 advisory
| # | Severity | Area | Finding | Location |
|---|---|---|---|---|
| 1 | 🟡 Minor | Correctness | A CSS comment inside a selector's parentheses survives into the heading and fabricates a class in the membership index — the one caller b4e03778 newly names as quiet on a bad yes |
scripts/color-tuple-css.test.mjs:840 |
| 2 | 🟡 Minor | Correctness | One depth counter for ( and [, so foo(] balances and the span after it reads one bracket too shallow — a } inside a function comes back as block structure. Already open as an inline thread raised 17 min after this HEAD; not re-posted. |
scripts/color-tuple-css.test.mjs:537 |
| 3 | 🟡 Minor | Coverage | Three keyword case-folds in requirements each change an answer and none is held by a case — verified by mutation, all three leave the matcher suite green. Already open as an inline thread; not re-posted. |
scripts/color-tuple-css.test.mjs:384 |
| 4 | 🔵 Advisory | Robustness | b4e03778 rewrote the withoutAttributes loop-bound comment to "defensive rather than a case anything reaches". .a[b).c reaches it — simpleSelectors returns names ['a'] and loses c — because of finding 2. The comment becomes true only once the bracket kinds are tracked. |
scripts/color-tuple-css.test.mjs:688 |
| 5 | 🔵 Advisory | Robustness | b4e03778's new shipsClass paragraph claims the sources of a fabricated name are enumerated and "what is left is named where it happens, in selectorConditions". Finding 1 is a fifth source. Deleting the "every source … is enumerated" clause leaves the paragraph true. |
scripts/color-tuple-css.test.mjs:164 |
| 6 | 🔵 Advisory | Robustness | PR body, for the maintainer: "Every behaviour in the matcher that can change an answer was reverted separately, and each fails the suite on its own assertion. The few that cannot are named as such in the code" — the three case-folds in finding 3 are neither pinned nor named, so the sentence does not hold as written. Neither this review nor the fix agent can edit the PR body. | PR body, How it is held |
| 7 | 🔵 Advisory | Correctness | The earlier thread on SCOPE_AT_RULE's missing case is fixed by this HEAD (@SCOPE(.the-root) at line 1435, plus @LAYER and the upper-case \A1 escape) but is still marked unresolved on the PR. Nothing to do in the code. |
scripts/color-tuple-css.test.mjs:1435 |
Overall: the change is sound and unusually well evidenced — I built bulma-ui/dist/bestax.css and the full suite is 6/6 green against the real stylesheet, and an independent differential (css-tree, whole shipped sheet) found no compound the matcher calls live that a real parser says does not render. The riskiest part is what the diff documents as settled: two of the three still-open defects are places where a comment added in this HEAD asserts a completeness the code does not have (findings 4 and 5), which is how a later edit loses the guard quietly. Look at finding 2 first — it is the only one that reaches the compound path, and it is the direction this file forbids; findings 1 and 3 are both narrow and latent against the stylesheet as it ships.
Residual risk:
- Refuted — the matcher against the real stylesheet. Differenced
simpleSelectors(css).setsagainst a css-tree walk over all 820 kB ofbulma-ui/dist/bestax.css(2488 matcher sets vs 2486 parser sets). Every difference resolves to either the intentional pseudo-element rule (.is-clearfix::after,.badge.is-pulse::after,.control.is-loading::after,.select.is-loading::after,.select.is-disabled::after— pinned at line 1201) or to key-spelling artifacts of my own comparison (css-tree keeps the\.inis-gap-0\.5; a repeated class inside one compound). Zero genuine divergence in either direction. - Refuted — the whole suite.
pnpm exec node --test scripts/color-tuple-css.test.mjsafterturbo run build --filter=@allxsmith/bestax-bulma: 6 pass, 0 fail.prettier --checkandeslintboth clean on the file. - Refuted — the shapes findings 1, 2 and the documented
selectorConditionslosses would need. The shipped sheet carries no@supports, no@scope, no@layer, no comment inside parentheses, and its brackets and braces both balance with no prefix ever going negative. Only@media(278),@keyframes(18) and@container(10) appear, and each has a case. All three risks are latent today. - Refuted — the shapes the tokeniser cannot model all land on the false-alarm side. Probed each on this HEAD:
&-nesting (.hero{&.is-primary{…}}→ dead), an attribute selector containing a combinator character ([a~=b]→ dead), a functional pseudo-element (::part(x)→ dead via the residue), an escaped)inside a:not()argument (→ dead), and a:not()written before the compound (→ live, which is correct). - Refuted — brace imbalance has no assertion where bracket imbalance now does. An extra
}pops the stack and un-nests what follows, but a browser's error recovery un-nests it too, so it cannot produce a false live;open.pop()on an empty stack is a no-op. - Open — finding 2. A mismatched bracket kind defeats both halves of the balance assertion (
strayfires only on a closer at depth 0, and the final check reads only the net), so.hero{a:foo(]}.notification.is-primary{color:red}[)}answerstruefornotification.is-primarytoday. - Open — finding 1. A benign comment inside a selector's parentheses is silent rather than loud, and the name it fabricates lands on the one caller that cannot see a bad yes.
🏄 Thirty-six commits paddling back out to the same break, and this set finally reads the swell right — five keyword cases where there were two, a boundary on a function that was matching its own tail, and a couple of comments walked back to what the code actually does. Two little rips still running off the point, a
]that closes a(and a/*that hides inside one, but the stylesheet it ships against is glassy and every answer holds. Good to go once those two get surfed.
One counter could not tell a `]` closing a `(` from a real close, so `foo(]` balanced and everything after it was read one bracket too shallow — a brace inside a function coming back as block structure, which is the direction this file forbids. Both halves of the balance check missed it on their own: the stray only fires on a closer with nothing open at all, and the net reads the same either way. It is a stack of kinds now, and a mismatch is caught where it happens. The shade comparison asks `rendersAlone` instead of membership, which removes the one caller that could not see a bad yes rather than going on enumerating what might produce one. A shade helper is a rule of its own or it is not a helper, so the narrow question is also the right one — and with that caller gone, a name fabricated anywhere fails loudly at every caller that remains, which is what the widened membership path was always claimed to rest on. A comment inside a selector's parentheses was the newest way to fabricate one, and it no longer reaches anything quiet. Three keyword case-folds in `requirements` had nothing holding them, and each changes an answer: a prohibition spelled `:NOT(` read as a requirement, an upper-case pseudo-class stopped being counted as one, and an upper-case pseudo-element stopped being exempt. Every shade helper the stylesheet ships is a sole subject, so no case can tell the two questions apart there. That one is the mechanism being right rather than a behaviour a revert would catch, and it says so where it sits.
|
deep-review: fresh — please read 484498a |
Preview DeploymentPreview URL: https://26e8edf4.bestax.pages.dev |
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Deep review — 0 blocking · 2 advisory
| # | Severity | Area | Finding | Location |
|---|---|---|---|---|
| 1 | 🔵 Advisory | Robustness | A comment inside a selector's parentheses still fabricates a membership name (shipsClass('.box:is(/* .zz */ .a){color:red}', 'zz') → true). Inert after 484498a2 — both remaining single-class callers are loud or one-directional — but it is a fifth source the enumeration in shipsClass does not list |
scripts/color-tuple-css.test.mjs:850 |
| 2 | 🔵 Advisory | Correctness | Three comments still name the shade deepEqual as the one shipsClass caller that is quiet on a bad yes. 484498a2 moved that caller to rendersAlone, so the premise is gone — the clauses read as a live hazard that no longer exists |
scripts/color-tuple-css.test.mjs:160, :588, :783 |
Suggested wording change for #2 — deletion only
The load-bearing sentence is the one that names a caller which no longer exists. Deleting the clause leaves each remainder true:
:160-168— drop the paragraph from "One caller is quiet on a bad yes" through "inselectorConditions." The paragraph above it already says what the remaining callers do, and with the quiet one gone that is the whole story.:588-590— drop ", which is loud everywhere except the shade comparison, where a fabricated entry makes an equality hold that should have failed". The sentence ending…a condition can spell a class name by accident.stands on its own.:783-787— drop "A fabricated name is usually loud, but not everywhere: … rather than raising one."
Overall: The change is sound, and I could not break it. I rebuilt bulma-ui/dist/bestax.css and differenced the whole index against an independent parser (css-tree): of the 621 two-class subject sets the guard reports, zero are ones the parser does not also call live at unconditional top level, and the membership index matches the parser's class set exactly (3,553 names each, differing only by the escape decoding the guard does and the parser does not — is-gap-0\.5 vs is-gap-0.5, where the guard is right). 484498a2 is the strongest commit on the branch: the bracket stack is a real fix — I confirmed foo(] and foo[) both throw where the counter balanced — and it is pinned, as are all three keyword case-folds. The riskiest part is no longer the matcher but the prose around it, which is why both rows above are comments: after this commit the file explains its own safety argument in terms of a caller it no longer has. Look at those three paragraphs first, then at the release decision in the PR body — I checked bulma-ui/release.config.js and { type: 'test', release: false } is there, so the squash subject the body proposes does release nothing, as claimed.
Residual risk:
- Over-reporting (a dead compound reading live) — refuted. Differential against
css-treeover the shipped stylesheet: every 2-class subject set the guard produces is one an independent parser also places as a sole, unconditional, unqualified subject..hero.is-primary .tabsansweringtabs.is-primary, the bug this PR opened for, is gone at the source. - A fabricated or lost membership name — refuted for the shipped stylesheet. Guard names and parser names are the same 3,553, modulo escape decoding.
- Fabrication from a comment inside parentheses — open, and named as row 1. The mitigation is caller-side rather than at the source. I walked the two remaining single-class callers: the
assert.okon a shaded keyword that must NOT ship fails loudly on a bad yes, and the-bis/-tersweep can only add toshipped, where an addition outsidevalidColorsfails loudly and one inside it changes nothing. So a bad yes today is a false alarm or a no-op, never a missed defect — but that property is a fact about the current call sites, not about the index. - Unpinned behaviour (an assertion that stays green while doing nothing) — swept, and clean. I mutation-tested 37 answer-changing edits across the matcher one at a time. Four survive green: the doubled string delimiter, the space left by a neutralised delimiter, the emptiness guard in
onlyClasses— the three the PR body names — andsubject?.includes('.'), which I confirmed changes no answer, since a class-less subject yields a set no query's size can match. The tworendersAlone-vs-membership call-site choices also survive; I measured all 988 shade-helper queries and the two functions agree on every one, so484498a2's claim that no case can tell them apart there holds as written. - The bracket stack halting on valid CSS — refuted as a regression.
]and[are legal in an unquoted url token, sourl(a]b.png)is well-formed CSS the guard refuses. It refused it before this commit too (the stray tracker fired), andurl(a[b.png)left a net-positive depth and tripped the other half, so nothing that used to pass now halts. Neither shape ships today. - Brace balance is still unchecked where bracket balance is asserted — refuted as a hazard. An extra
}pops an already-empty stack and is clamped; a missing one over-nests every later rule. Both land on the false-alarm side, which is the direction this file allows, so the asymmetry with brackets is correct rather than an oversight. - Performance — measured, fine. Full suite 1.5 s, of which the per-element case is 1.2 s and dominated by
extractComponentrather than the matcher. The index is built once per stylesheet text and cached.
🏄 Twelve rounds deep and this thing is polished — I threw a real CSS parser at the whole stylesheet and it came back clean, and every knob I turned broke a test on purpose. Only thing still bobbing out there is a couple of paragraphs describing a wave that already rolled through. Ship it, dude.
Three comments still explained why the membership path is safe in terms of a caller it no longer has. The shade comparison was the one place a wrong yes was quiet, and the commit before this one moved it to `rendersAlone`, so those paragraphs described a hazard that had already been removed — which is the kind of prose that reads as a live constraint and quietly stops being one. What holds now is simpler and worth stating in its own right: this path is safe because no caller reads it in a direction where a wrong yes is quiet. That is a property of the call sites, not of the index, and the index can still be wrong — a comment inside a selector's parentheses survives the strip by design, because a comment opener at depth is content, which is what keeps an unquoted url token from opening one. So the check when adding a caller is which way it fails rather than whether the index can be wrong, and there is a case pinning that fabrication so the day a caller stops failing loudly, this is already written down.
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deep-review: fresh — please read e24dbc6 |
Preview DeploymentPreview URL: https://a439ebe1.bestax.pages.dev |
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deep-review: fresh — please read e24dbc6 |
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🎉 This PR is included in version 5.16.3 🎉 The release is available on: Your semantic-release bot 📦🚀 |
| open.pop(); | ||
| } | ||
| // The last chunk is whatever trails the final `{`, and opens nothing. | ||
| if (i === chunks.length - 1) break; |
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The last-chunk break is a third answer-changing line with no case, and it is not one of the two the PR names as unpinnable — 🟡 Minor · Coverage
What: delete this line and the whole suite stays green (node --test scripts/color-tuple-css.test.mjs → 6 pass, 0 fail). But it is not inert: the final chunk is whatever trails the last {, and without the break its text is read as a heading and indexed as a rule that has no block. .a{color:red}.notification.is-primary then answers notification.is-primary live — a selector with no block renders nothing, so that is the direction this file forbids, reached by deleting one line the suite cannot see.
Why it matters: the PR body's completeness claim is "Every behaviour in the matcher that can change an answer was reverted separately, and each fails the suite on its own assertion. The few that cannot are named as such where they sit" — and names exactly three (the doubled string delimiter, the space left by a neutralised delimiter, the emptiness guard in onlyClasses). This is a fourth, it is neither named nor held, and unlike the other three it moves an answer to the silent side rather than being inert. It is also the same shape as the @-branch continue immediately below, which is held (removing that one fails three cases).
How it was measured
Mutant applied to a copy of the file, run against the real suite with the built bulma-ui/dist/bestax.css present:
// The last chunk is whatever trails the final `{`, and opens nothing.
- if (i === chunks.length - 1) break;Result: 6 pass, 0 fail. Under that mutant:
shipsClass('.a{color:red}.notification.is-primary', 'notification.is-primary')
// unmutated: false mutant: trueThe shipped stylesheet does not reach it — it ends in /*# sourceMappingURL=… */, which nonStructure removes at depth zero, leaving an inert empty final chunk — which is precisely why nothing measured against Bulma can hold this line.
Fix: one case in the same section as the other structural ones, offering the trailing selector the block it never gets:
// The final chunk is whatever trails the last `{`, so it is text with no
// block after it. A selector with no block renders nothing, and reading
// it as a rule is the forbidden direction.
assert.equal(
live('.a{color:red}.notification.is-primary', 'notification.is-primary'),
false,
'a selector left dangling at the end of the stylesheet opens no ' +
'block, so nothing it names renders and it must not be indexed as ' +
'a rule.'
);
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Deep review — 1 blocking · 4 advisory
| # | Severity | Area | Finding | Location |
|---|---|---|---|---|
| 1 | 🟡 Minor | Coverage | The last-chunk break moves an answer to the silent side when deleted, has no case, and is not one of the three the PR names as unpinnable |
scripts/color-tuple-css.test.mjs:751 |
| 2 | 🔵 Advisory | Coverage | PR body. The claim that every answer-changing behaviour either fails the suite on its own assertion or is named where it sits is not exact — finding 1 is a fourth, and it is neither. Deleting the sentence that follows each fails the suite on its own assertion. would leave the rest true. | PR description |
| 3 | 🔵 Advisory | Coverage | codeOnly's three new call sites are unheld — the function has cases, the wiring does not. Removing codeOnly( from tupleFrom, colorKeywords or cssBackedColors leaves the suite green. |
scripts/color-tuple-css.test.mjs:892 |
| 4 | 🔵 Advisory | Robustness | Two lines in selectorConditions are inert rather than load-bearing: at.lastIndex = i only suppresses a duplicate harvest, and depth === 0 ? i - 1 : i only trims a ) that is not a class token. Deleting either changes no answer. |
scripts/color-tuple-css.test.mjs:621 |
| 5 | 🔵 Advisory | Robustness | Taking the last simple selector as the subject cannot change an answer: contextual is true whenever simples.length > 1, and a sentinelled set matches neither a compound query nor rendersAlone. simples[0] passes the whole suite. |
scripts/color-tuple-css.test.mjs:857 |
Overall: the change is sound, and unusually well evidenced. I differenced both indexes against an independent postcss + postcss-selector-parser oracle over the whole shipped stylesheet and got exact agreement in both directions — subject sets 2488 vs 2488, membership names 3553 vs 3553, zero divergence either way — so the invariant this PR exists to restore holds on the CSS the library actually builds. The riskiest part is not the matcher but its held-ness: this is a text parser whose only defence against silent regression is its own unit suite, so what matters is the behaviour that suite cannot see. Sixty-five mutants across nonStructure, requirements, classesOf, simpleSelectors, selectorConditions, withoutAttributes, unescaped, codeOnly and the regex constants were all caught except the ones above. Look at finding 1 first, then at the release decision the body already flags: the branch carries fix(bulma-ui) commits, so only a test(bulma-ui): squash subject keeps this from cutting a patch release whose changelog describes a matcher no consumer can see.
Residual risk:
- Open — the last-chunk
break(finding 1). The only unheld line I found that moves an answer to the forbidden side. Unreachable from the shipped stylesheet, which ends in a source-map comment thatnonStructureremoves at depth zero, leaving an inert empty final chunk. - Refuted — an unterminated
/*silently eats the rest of the file.nonStructureruns the span to EOF with no assertion, but that is what CSS does: a comment is consumed to EOF, so nothing after it renders. Reading it as dropped is correct, not a leak. - Refuted — the line break that bounds an unterminated string is consumed and never re-emitted. Losing a separator can only fuse text, which shortens the simple-selector chain or lengthens the qualifier residue; every contextual or qualified set carries
UNMODELLED, so neither shape can answer live. Checked on the LF, CR, FF and CRLF variants with a brace inside the string. - Refuted —
open.pop()underflows silently on an excess}. Every}outside a string, a comment or a bracket span is real block structure, andnonStructureasserts bracket balance as it goes, so the count driving the pops cannot be inflated by content. - Refuted — the fabricated name from a comment inside a selector's parentheses.
e24dbc6cpins it and re-grounds the safety argument on the call sites. I checked every single-class call site — the keyword-shadeassert.okand the twoshipsClassreads feeding the bis/ter sweep — and each fails loudly on a wrong yes, so the claim as now written holds. - Refuted — narrowing the shade
deepEqualand the keyword assertion fromshipsClasstorendersAlone.rendersAloneis strictly narrower, so it can only drop an entry from the left of an equality or fail anassert.ok, which is the false-alarm side. Four dedicatedalone(…)cases pin it. - Refuted — regex state leaking between calls.
CLASS_TOKEN,CLASS_SELECTORandQUOTEDare module-level and global, but every use ismatchAll(which clones) orreplace(which resetslastIndex), andselectorConditionsbuilds its own per call.
🏄 Twelve rounds deep and this thing finally reads a stylesheet the way a browser does — two independent parsers agree with it token for token, both directions, zero drift. One lonely
breakis out there paddling with no test watching it. Patch that and it is a clean ride all the way to the beach.
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🎉 This PR is included in version 4.2.9 🎉 The release is available on: Your semantic-release bot 📦🚀 |
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🎉 This PR is included in version 2.3.7 🎉 The release is available on: Your semantic-release bot 📦🚀 |
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🎉 This PR is included in version 1.2.6 🎉 The release is available on: Your semantic-release bot 📦🚀 |
2 participants
#699landed the colour guard with a matcher that answered co-occurrence rather than compounds, so.hero.is-primary .tabsanswered the querytabs.is-primary— a dead modifier reading as live, which is a missed defect rather than a false alarm. This PR carries the fix that missed that merge, and then everything twelve rounds of review found behind it.What the guard does
scripts/color-tuple-css.test.mjsholds the colour tuples inbulma-uito the stylesheet the library ships, in both directions: a colour the CSS has andvalidColorslacks is dropped silently, and a colour in the tuple whose component modifier has no rule renders a dead class. To ask either question it has to answer "does the stylesheet ship CSS for this compound", and that is what the matcher does.The invariant
Reading a compound as live when nothing renders is a missed defect. Reading it as dead when something does is a false alarm. The guard is only ever allowed the second. Every finding below is a case where it was allowed the first, and every fix moves it back.
The mechanism is one rule: a simple selector's class set must account for everything the selector requires, and a query matches only on an exact size. So anything the tokeniser cannot read as a class has to still be counted, or a rule needing three classes answers a two-class query.
What each round found
:not():is(),:where(),:has():first-child,:hover,[disabled]a.dropdown-item.hero .tabs@media,@supports,@container,@scope.hero{color:red;.tabs{…}}.is-gap-0\.5content:"}":not(:nth-last-child(1))ONLY_CLASSESTwo questions turned out to be hiding inside one index and are now separate. Whether a rule styles a compound reads the subject sets with the exact-size rule. Whether the stylesheet knows a name reads every name mentioned anywhere, prohibition included — answering that one from the subject sets hid a class that only ever appears as an ancestor, and a colour the CSS ships and the tuple lacks is the first defect this file was written for.
How it is held
The matcher has a test of its own, on selectors written for the purpose rather than on whatever Bulma happens to emit. That matters because every finding here was a matcher bug rather than a library one, and each was found by measuring the built stylesheet, which can only cover shapes already in it — there is no
:is()or:where()in Bulma at all, and some of what does ship comes from our own SCSS.Every behaviour in the matcher that can change an answer was reverted separately, and each fails the suite on its own assertion. The few that cannot are named as such where they sit, and each is either inert by construction or unreachable from the stylesheet this repo builds: one string delimiter emitted instead of two and the space left where a neutralised delimiter stood, neither of which any query can read, and the emptiness guard in
onlyClasses, which covers an empty:not()that is not valid CSS. That property is the point, and it is also what kept catching me: assertions were repeatedly found to be passing without reaching what they named — most because a single-class query takes the membership path and never sees the exact-size rule, and one because there are two ways to mishandle a string escape and they leak on opposite sides of it, so a single case can only catch one.Risk
Every fix here is latent against the stylesheet as it ships: no answer this guard asks moves, across the element-and-colour pairs and the helper-class sweeps alike. Two independent selector parsers were used in review to difference the whole index over all shipped selectors, and neither found a compound the matcher calls live that the parser does not.
One decision for the reviewer
The diff touches
scripts/color-tuple-css.test.mjsand nothing else — no file underbulma-ui/, nothing in any tarball.fix(bulma-ui)therefore cuts a patch release of@allxsmith/bestax-bulmawhose changelog describes a matcher no consumer can see, becausereleaseRuleskey off the commit scope and never the path. Squash-merging with atest(bulma-ui):subject releases nothing, which is what I would do; the commit scopes below a squash do not matter, and this is a single-package branch, so the usual reason to avoid squashing here does not apply.Summary by CodeRabbit
Bug Fixes
Tests