[POC] Stringview

[qazxcdswe123]

The main idea is to eliminate the cost of constructing an Array from String then ArrayView it.

However, this implementation lacks some important property, like

match view {
  ['-', '>', .. as rest] => ...
}

Which is extensively used in minimoonbit's implementation. This is not ideal, and the compiler should be able to handle this case

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[peter-jerry-ye-code-review]

Based on the provided git diff output, here are three potential issues or suggestions for improvement in the MoonBit code:

1. Repeated Test Cases:

   • File: builtin/stringview_test.mbt
   • Issue: There are several repeated test cases with the same name. For example, panic string_as_view_start_index_error, panic string_as_view_end_index_error, and panic string_as_view_length_index_error are each repeated twice.
   • Suggestion: Remove the duplicate test cases to avoid redundancy and potential confusion. Each test case should have a unique name to clearly identify its purpose.

2. Error Handling in guard Statements:

   • File: builtin/stringview.mbt
   • Issue: The guard statements use abort for error handling, which might not be the most graceful way to handle errors.
   • Suggestion: Consider using a more controlled error handling mechanism, such as raising an error or returning an error type. This would allow for better error propagation and handling in a larger application.

3. Use of |> ignore in Tests:

   • File: builtin/stringview_test.mbt
   • Issue: The |> ignore operator is used in several test cases to ignore the result of an expression that is expected to cause a panic.
   • Suggestion: Instead of ignoring the result, consider using a try/catch block to explicitly handle the expected error, which can provide more clarity and ensure that the test case is properly verifying the error condition.

These observations are based on the provided code snippets and the context of MoonBit programming language. They aim to enhance code clarity, maintainability, and error handling practices.

[coveralls]

Pull Request Test Coverage Report for Build 3106

Details

• 13 of 13 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 83.493%

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Totals
Change from base Build 3103:	0.09%
Covered Lines:	3930
Relevant Lines:	4707

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💛 - Coveralls