Guard ViewBind migration with Fiber context check #171
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Summary of Changes
Hello @ReneWerner87, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request refines the existing ViewBind migration tool to ensure that it only modifies Bind() calls that are part of a Fiber context. This enhancement prevents unintended changes to Bind() calls from other packages or contexts, making the migration process more robust and targeted. A new regression test has also been added to validate this guarded behavior.
Highlights
- Refined ViewBind Migration Logic: The MigrateViewBind function now uses a more specific regular expression and a conditional replacement logic to ensure that .Bind() calls are only converted to .ViewBind() when they are associated with a Fiber context.
- Added Regression Test for Non-Fiber Bind Calls: A new test case has been introduced to verify that Bind() calls not related to a Fiber context are correctly ignored by the migration tool, preventing erroneous modifications.
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Code Review
The pull request correctly identifies the need to limit the ViewBind migration to only fiber.Ctx receivers and adds a useful regression test. However, the regular expression used for matching .Bind calls is not robust enough to handle arguments that contain nested parentheses, such as function calls. This can cause the migration to fail on valid code patterns. I've provided a suggestion to improve the regular expression to make the migration more reliable.
| func MigrateViewBind(cmd *cobra.Command, cwd string, _, _ *semver.Version) error { | ||
| // Replace .Bind() with arguments, not the Bind() from the binding package | ||
| reViewBind := regexp.MustCompile(`\.Bind\(([^)]+)\)`) | ||
| reViewBind := regexp.MustCompile(`(\w+)\.Bind\(([^)]+)\)`) |
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The regular expression ([^)]+) for capturing arguments is not robust for cases where arguments themselves contain parentheses, such as in a function call. For example, a call like c.Bind(someFunc(a)) will not be matched by this regex, and thus will not be migrated. This can lead to incomplete migrations.
A more robust approach would be to use a non-greedy match for the arguments. This can handle simple nested parentheses. To also ensure multi-line arguments are supported (as . does not match newlines by default), the (?s) flag should be used.
I suggest updating the regex to be more resilient.
| reViewBind := regexp.MustCompile(`(\w+)\.Bind\(([^)]+)\)`) | |
| reViewBind := regexp.MustCompile(`(?s)(\w+)\.Bind\((.*?)\)`) |
Summary
Testing
go test ./...https://chatgpt.com/codex/tasks/task_e_68a9d82d86008326aad3f5d43f4727e2