[JULES] Scheduled Maintenance: Optimized native_replace memory allocations - #514
[JULES] Scheduled Maintenance: Optimized native_replace memory allocations#514logbie wants to merge 1 commit into
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Co-authored-by: logbie <1138960+logbie@users.noreply.github.com>
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📝 WalkthroughWalkthroughThis PR adds a short-circuit optimization to ChangesText Replace Optimization
Estimated code review effort🎯 2 (Simple) | ⏱️ ~7 minutes Possibly related PRs
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Pull request overview
Improves native_replace in the stdlib text module by avoiding unnecessary allocations when the target substring is not present, aligning with other string operation optimizations in src/stdlib/text.rs.
Changes:
- Added a fast-path check (
contains) to return anArc::cloneof the original text when no replacement is needed.
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| // Optimization: avoid string allocation if string doesn't contain old | ||
| if !text.contains(old.as_ref()) { | ||
| return Ok(Value::Text(Arc::clone(&text))); | ||
| } |
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@src/stdlib/text.rs`:
- Around line 282-286: Add a unit test that exercises the optimization path in
native_replace by verifying it returns the original Arc text when the `old`
pattern isn't present: create a test named `test_replace_not_found` in the tests
module that calls `native_replace` with Value::Text(Arc::from("hello world")) as
the text and a non-existent pattern like Value::Text(Arc::from("xyz")), unwraps
the result, and asserts it equals Value::Text(Arc::from("hello world"))); this
ensures the early-return branch (the contains check in native_replace) is
covered.
🪄 Autofix (Beta)
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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| // Optimization: avoid string allocation if string doesn't contain old | ||
| if !text.contains(old.as_ref()) { | ||
| return Ok(Value::Text(Arc::clone(&text))); | ||
| } |
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🛠️ Refactor suggestion | 🟠 Major | ⚡ Quick win
Add test coverage for the optimization path.
The optimization correctly avoids allocation when the pattern is not found, but there's no test case covering this path. Consider adding a test to verify the behavior when old is not present in text.
🧪 Suggested test case
Add this test to the tests module:
#[test]
fn test_replace_not_found() {
let result = native_replace(vec![
Value::Text(Arc::from("hello world")),
Value::Text(Arc::from("xyz")),
Value::Text(Arc::from("rust")),
])
.unwrap();
assert_eq!(result, Value::Text(Arc::from("hello world")));
}🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@src/stdlib/text.rs` around lines 282 - 286, Add a unit test that exercises
the optimization path in native_replace by verifying it returns the original Arc
text when the `old` pattern isn't present: create a test named
`test_replace_not_found` in the tests module that calls `native_replace` with
Value::Text(Arc::from("hello world")) as the text and a non-existent pattern
like Value::Text(Arc::from("xyz")), unwraps the result, and asserts it equals
Value::Text(Arc::from("hello world"))); this ensures the early-return branch
(the contains check in native_replace) is covered.
Summary of Changes
native_replacefunction insrc/stdlib/text.rsunconditionally allocates a new string, even if the substring to replace is not present..contains()to return anArc::cloneof the original string if the substring to replace is not found.Verification Checklist
cargo fmtexecuted and passed.cargo clippyreturned no warnings or errors.cargo testsuites passed (100% success rate).PR created automatically by Jules for task 17032477163809379702 started by @logbie
Summary by CodeRabbit