A parse that failed is not a check that passed - #39
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The structural check over `src/probe.rs` walked whatever tree-sitter recovered
and reported what it found. Over a source that did not parse, what it finds is
nothing -- and nothing is exactly what it prints over a module that complies.
Measured, on a fixture with an unterminated string literal three lines above
the defect: the `Command::new("git")` the rule exists to refuse is not a
`call_expression` any more, the walk misses it, and the check goes green over
the file it was written for. The same fixture, one character different, is
refused. Both are in the test now, because a claim about invisibility is worth
nothing without the twin that shows the verdict flipping.
`unparsed` answers where the grammar gave up, and every reader asks it before
counting anything. It reports line 6 for a mistake on line 3, since recovery
keeps lexing past the opening quote and gives up further down -- pinned in the
assertion rather than smoothed over, because a reader sent to the wrong line is
owed the difference.
`comments.rs` decides this the other way for the rule it carries, and the
difference is the point rather than an inconsistency: comments survive error
recovery, so a forbidden-comment rule reading a broken file still sees the
comments, and a structural rule asking whether a shape appears anywhere does
not have that luck. The shape it missed is the shape it was hunting.
ADR 0003 carries the evaluation this came out of: the same rule written in
ast-grep, thirteen lines against about thirty-five, with the diagnostics free
and a second grammar costing a rule rather than an implementation. It is not
adopted here, because the rule already runs and a second checker over one
answer is two answers free to disagree -- this repository has run that
experiment once already, with a pin check that counted an unreachable remote as
passed. What the comparison did produce is two findings that outlive it: a
matcher can refuse a shape that is present and cannot require one that must be,
which is the direction `require_regexp` exists for one tier down; and a
structural provider's clean exit is evidence only when a parse-failure rule
runs beside it. The second one goes into the provider contract.
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📝 WalkthroughWalkthroughThe structural checks now use shared tree-sitter parsing, reject recovered or malformed syntax, and reuse command-construction counting. Tests cover valid fixtures and malformed source. ADR 0003 documents the structural provider contract and parse-failure boundary. ChangesStructural parse validation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change improves parse-failure handling, but the current structural checks can still miss required Git-environment cleanup when it is moved outside the intended helper and can overlook command construction outside a function. Those gaps could let unsafe repository-targeting behavior pass without a failing check, so merge should wait until the predicates are scoped correctly and all relevant call sites are covered. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #39 +/- ##
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Coverage 89.44% 89.44%
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Files 31 31
Lines 9732 9732
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Hits 8705 8705
Misses 1027 1027 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Actionable comments posted: 3
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Inline comments:
In `@docs/adr/0003-the-structural-tier-and-what-a-clean-run-means.md`:
- Around line 80-84: Bind the structural assertions in
tests/structural_git_env.rs to the body of detached rather than searching all of
src/probe.rs. Parse or otherwise isolate detached and verify all eight required
env_remove calls occur within that function, preserving the intended protection
against inherited GIT_* variables.
In `@tests/structural_git_env.rs`:
- Around line 276-284: The regression fixture in
tests/structural_git_env.rs:276-284 should either make repaired differ from
swallowed only by the closing quote, preserving the intended delimiter-only
regression, or revise the test description to document the broader repair.
Update docs/adr/0003-the-structural-tier-and-what-a-clean-run-means.md:104-105
to match the chosen behavior; both sites require changes if the broader repair
remains intentional.
- Around line 191-198: Update bare_constructions to retain Command::new calls
whose enclosing_function result is None, excluding only calls enclosed by
Some("detached"). Remove the filter_map that discards None values and apply the
predicate directly to the optional enclosing function result.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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docs/adr/0003-the-structural-tier-and-what-a-clean-run-means.mdtests/structural_git_env.rs
Three findings from review, and the first is the one that matters: the
assertions that `detached` still strips were `source.contains("\"GIT_DIR\"")`
over the whole module. That sentence is satisfied by a comment, by a message
string, and by a `GIT_DIR` in any other function -- and it covered three of the
eight names git exports, so a helper that had stopped removing the other five
passed it. `stripped_names` reads the call and the literals out of `detached`'s
own body, and the assertion names all eight.
What it deliberately still does not prove: which name reaches which call. The
helper hands `env_remove` a loop variable, so the argument at the call site is
an identifier, and following a value into a loop is the tier above a syntax
tree. Written down in the function and in ADR 0003 rather than left as an
assertion that reads stronger than it is.
The other two:
* `bare_constructions` dropped every call with no enclosing function, where the
check it replaced counted one as an offender. A static initializer or a
module-level const is not `detached`, and "nowhere in particular" is not the
helper. It returns the offenders now, so the repository check and the
fixtures ask one question through one function.
* The twins in the parse fixture differed by a variable name as well as by the
quote, so the pair did not isolate what it claims to isolate. One character
apart now, as stated.
The required-shape assertions are driven both ways as well: the helper in the
offending fixture removes something and names it, the one in the clean fixture
removes nothing and is read as stripping nothing. An assertion nobody has seen
fail may be reading the wrong thing.
2 participants
Answers two deliverables of #13: the ast-grep comparison, and the parse-error behaviour the structural tier was asked to define. The comparison found a defect in the check this repository already runs, so the fix travels with it.
The defect
tests/structural_git_env.rswalked whatever tree-sitter recovered fromsrc/probe.rsand reported what it found. Over a source that did not parse, what it finds is nothing -- and nothing is byte-identical to what it prints over a module that complies.Measured, on a fixture with an unterminated string literal three lines above the defect: the
Command::new("git")the rule exists to refuse is no longer acall_expression, the walk misses it, and the check goes green over the exact file it was written for. The same fixture one character different is refused. Both twins are in the test, because a claim about invisibility is worth nothing without the one that shows the verdict flipping.unparsednow answers where the grammar gave up, and every reader asks it first. It reports line 6 for a mistake on line 3 -- recovery keeps lexing past the opening quote -- and that is pinned in the assertion rather than smoothed over.comments.rsdecides this the other way for the rule it carries, and the difference is the point: comments survive error recovery, so a forbidden-comment rule reading a broken file still sees them. A structural rule asking whether a shape appears anywhere does not have that luck.ADR 0003, the comparison it came out of
The same rule in ast-grep is thirteen lines against about thirty-five, over the same grammar this binary already links, with the diagnostics -- span, line, column, rule id, severity -- free. The same property in Python is twenty-three lines in the same schema, where one consuming repository states it in 492 lines of hand-written Python.
Three findings the line count does not carry:
language:. N rules in one schema beats N implementations in N languages, and it is not the cross-grammar abstraction the question asked about.GIT_DIRand still callsenv_remove-- a rule about a construct that must exist, which a list of matched nodes has no vocabulary for. This is the directionrequire_regexpexists for one tier down.ast-grep scanover the swallowed fixture exits 0 with no output. The state is recoverable with a second rule matchingkind: ERROR, but it is a second rule, per adopter, that nothing requires.Not adopted for this rule, on duplication rather than merit: the rule already runs here, and a second checker over one answer is two answers free to disagree -- which this repository has already had once, from a pin check that counted an unreachable remote as passed. ast-grep is adoptable as a provider and needs no new mechanism to be; the parse-failure requirement goes into the provider contract.
Checks
cargo test,cargo clippy --all-targets,cargo fmt --check,uphold scan,uphold check, the Python suite and the generated-file checks all pass locally, and the commit went through the installed hooks.Summary by CodeRabbit
Bug Fixes
Documentation