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Co-authored-by: logbie <1138960+logbie@users.noreply.github.com>
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📝 WalkthroughWalkthroughThis PR refactors uppercase and lowercase text handling in ChangesCase conversion helper refactoring
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Possibly related PRs
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Pull request overview
This PR refactors the text stdlib’s casing builtins by consolidating the shared “fast-path” logic (skip allocation if the string is already in the target case) into a single helper function, reducing duplicated code in touppercase/tolowercase.
Changes:
- Added a shared helper
change_case_if_neededto determine whether a casing transformation would change the input. - Updated
native_touppercaseandnative_tolowercaseto use the shared helper instead of duplicated per-function logic.
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| change_case_if_needed(text, char::to_lowercase, str::to_lowercase) | ||
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🧹 Nitpick comments (1)
src/stdlib/text.rs (1)
104-122: ⚡ Quick winConsider adding tests for the case-conversion optimization.
While the refactoring correctly preserves behavior and all existing tests pass, consider adding unit tests that explicitly verify:
- Already-uppercase strings return the same Arc (no allocation)
- Already-lowercase strings return the same Arc (no allocation)
- Mixed-case strings are transformed correctly
- Unicode expansion cases (e.g., "ßeta".to_uppercase() → "SSETA")
This would document the optimization behavior and prevent future regressions.
📋 Example test cases
#[test] fn test_touppercase_already_upper() { let upper = Arc::from("HELLO"); let result = native_touppercase(vec![Value::Text(Arc::clone(&upper))]).unwrap(); if let Value::Text(result_text) = result { assert_eq!(result_text.as_ref(), "HELLO"); // Optimization: should return same Arc assert!(Arc::ptr_eq(&upper, &result_text)); } else { panic!("Expected text"); } } #[test] fn test_tolowercase_already_lower() { let lower = Arc::from("hello"); let result = native_tolowercase(vec![Value::Text(Arc::clone(&lower))]).unwrap(); if let Value::Text(result_text) = result { assert_eq!(result_text.as_ref(), "hello"); // Optimization: should return same Arc assert!(Arc::ptr_eq(&lower, &result_text)); } else { panic!("Expected text"); } } #[test] fn test_touppercase_transforms() { let result = native_touppercase(vec![Value::Text(Arc::from("hello"))]).unwrap(); assert_eq!(result, Value::Text(Arc::from("HELLO"))); } #[test] fn test_touppercase_unicode_expansion() { let result = native_touppercase(vec![Value::Text(Arc::from("ßeta"))]).unwrap(); assert_eq!(result, Value::Text(Arc::from("SSETA"))); }🤖 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 104 - 122, Add unit tests that exercise the change_case_if_needed optimization via native_touppercase and native_tolowercase: write tests that create Arc<str> inputs for already-uppercase and already-lowercase strings and assert Arc::ptr_eq(&orig, &result_text) to ensure no allocation, tests that verify mixed-case strings are transformed to the expected result, and a Unicode-expansion test (e.g., "ßeta" -> "SSETA") to assert correct transformed content; use the existing Value::Text wrapper and unwrap the native_* functions' Result to compare both pointer-equality for optimized no-op cases and content equality for transformed cases.
🤖 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.
Nitpick comments:
In `@src/stdlib/text.rs`:
- Around line 104-122: Add unit tests that exercise the change_case_if_needed
optimization via native_touppercase and native_tolowercase: write tests that
create Arc<str> inputs for already-uppercase and already-lowercase strings and
assert Arc::ptr_eq(&orig, &result_text) to ensure no allocation, tests that
verify mixed-case strings are transformed to the expected result, and a
Unicode-expansion test (e.g., "ßeta" -> "SSETA") to assert correct transformed
content; use the existing Value::Text wrapper and unwrap the native_* functions'
Result to compare both pointer-equality for optimized no-op cases and content
equality for transformed cases.
Summary of Changes
native_touppercaseandnative_tolowercasefunctions insrc/stdlib/text.rscontained duplicated logic for checking if a string was already in the desired case before applying the case transformation.change_case_if_neededto replace the type-specific fast-path bounds checking variants.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 6448561099310927995 started by @logbie
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