fix #1602: преобразование ЭлементСпискаЗначений в строку

[Mr-Rm]

Summary by CodeRabbit

• Improvements

  • List elements now convert to strings using presentation format when available, with automatic fallback to default conversion when not.

• Tests

  • Added test coverage for list element string conversion functionality.

[coderabbitai]

Walkthrough

This PR adds a ToString() method override to the ValueListItem class that prefers Presentation over Value.ToString(), refactors property accessors with null-coalescing behavior, and introduces corresponding test coverage for list element string conversion.

Changes

Cohort / File(s)	Summary
ValueListItem.cs refactoring src/OneScript.StandardLibrary/Collections/ValueList/ValueListItem.cs	Streamlined property accessors (Presentation, Check) with expression-bodied get/set and null-coalescing; added ToString() override that prioritizes Presentation over Value.ToString() fallback
String conversion test addition tests/value-list.os	Added new exported test procedure ТестДолжен_ПроверитьПреобразованиеЭлементаСпискаВСтроку() and registered it in the test collection builder ПолучитьСписокТестов()

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Straightforward method override with clear null-coalescing logic
• Property accessor refactoring follows common C# patterns
• New test is isolated and additive with no modifications to existing test logic

Poem

🐰 A string representation takes shape,
Presentation blooms, or Value won't escape,
The ToString hops with elegance true,
And tests dance along to verify too! ✨

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: adding string conversion functionality (ToString override) to the ValueListItem class, directly addressing issue #1602.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e5188ef and e3fcb95.

📒 Files selected for processing (2)

• src/OneScript.StandardLibrary/Collections/ValueList/ValueListItem.cs (1 hunks)
• tests/value-list.os (1 hunks)

🧰 Additional context used

🧠 Learnings (1)

📚 Learning: 2024-10-01T08:10:34.187Z

Learnt from: Mr-Rm
Repo: EvilBeaver/OneScript PR: 1456
File: src/ScriptEngine/Compiler/StackMachineCodeGenerator.cs:308-308
Timestamp: 2024-10-01T08:10:34.187Z
Learning: Если метод `ToString()` обеспечивает достаточное представление константы, возможно, хранение поля `presentation` не требуется.

Applied to files:

• src/OneScript.StandardLibrary/Collections/ValueList/ValueListItem.cs

🧬 Code graph analysis (1)

src/OneScript.StandardLibrary/Collections/ValueList/ValueListItem.cs (1)

src/ScriptEngine/Machine/ValueFactory.cs (1)

• ValueFactory (17-175)

🔇 Additional comments (6)

src/OneScript.StandardLibrary/Collections/ValueList/ValueListItem.cs (4)

31-31: LGTM!

The simplification to an auto-property is appropriate and maintains the same functionality.

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36-37: LGTM!

The expression-bodied syntax with null-coalescing operator correctly normalizes null values to empty strings while maintaining the same behavior.

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41-41: LGTM!

The simplification to an auto-property is appropriate.

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46-47: LGTM!

The expression-bodied syntax with null-coalescing operator correctly normalizes null values to undefined values via ValueFactory.Create().

tests/value-list.os (2)

22-22: LGTM!

The new test is correctly added to the test collection with consistent naming.

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397-413: Excellent test coverage!

The test comprehensively covers the string conversion behavior including edge cases:

• No presentation specified (falls back to value)
• Empty presentation (falls back to value)
• Undefined presentation (normalized and falls back to value)
• Space presentation (preserved as presentation)

[coderabbitai]

⚠️ Potential issue | 🔴 Critical

Add null check for Value to prevent NullReferenceException.

If Value is null, calling Value.ToString() will throw a NullReferenceException. Since Value is not initialized in the constructor and is a settable property, it can be null.

Apply this diff to add a null check:

 public override string ToString()
- => !String.IsNullOrEmpty(_presentationHolder) ? _presentationHolder : Value.ToString();+ => !String.IsNullOrEmpty(_presentationHolder) ? _presentationHolder : Value?.ToString() ?? String.Empty;

📝 Committable suggestion

‼️IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	publicoverridestringToString()
	=>!String.IsNullOrEmpty(_presentationHolder)?_presentationHolder:Value.ToString();
	publicoverridestringToString()
	=>!String.IsNullOrEmpty(_presentationHolder)?_presentationHolder:Value?.ToString()??String.Empty;

🤖 Prompt for AI Agents

In src/OneScript.StandardLibrary/Collections/ValueList/ValueListItem.cs around
lines 50-51, the ToString() implementation calls Value.ToString() which can
throw a NullReferenceException if Value is null; change the logic so it returns
_presentationHolder if present, otherwise if Value is non-null return
Value.ToString(), and if Value is null return an empty string (or another safe
default) to avoid the exception.