Code Smells: Multiple Components Need Refactoring for Better Maintainability and Code Quality

首先定位 ImportOrderer.scanImports、CommandLineOptionsParser.parseRange 和 JavaCommentsHelper.rewrite，然后阅读它们周围的调用方和现有测试。将每个方法视为单独的重构区域，并在修改前后运行现有测试套件。完成的标准是组织结构和可读性得到改善，同时不发生任何功能或 API 变更，并且所有测试都通过。

Description

Several code quality issues that would benefit from refactoring have been identified in the codebase. These issues impact maintainability and code readability.

Areas Needing Attention

1. Complex Method in ImportOrderer

Location: com.google.googlejavaformat.java.ImportOrderer.scanImports
Type: Implementation Smell
Problem: Complex Method (Cyclomatic complexity of 15)

Current Issues:

• Multiple responsibilities mixed in single method
• High cyclomatic complexity makes code hard to understand
• Difficult to maintain and test
• Deep nesting levels

Suggested Changes:

• Extract import scanning logic into separate methods
• Create helper class for related data
• Split complex logic into smaller, focused methods
• Improve code organization with clear responsibilities

2. Magic Numbers in CommandLineOptionsParser

Location: com.google.googlejavaformat.java.CommandLineOptionsParser.parseRange
Type: Implementation Smell
Problem: Magic Number, Missing Proper Default Case

Current Issues:

• Usage of magic numbers (1, 2)
• Missing default case in switch statement
• Implicit meaning of numbers reduces readability
• Poor error handling

Suggested Changes:

• Introduce named constants for numeric values
• Add proper default case handling
• Improve error messaging
• Enhance code readability and maintainability

3. Long Statement in JavaCommentsHelper

Location: com.google.googlejavaformat.java.JavaCommentsHelper.rewrite
Type: Implementation Smell
Problem: Long Statement

Current Issues:

• Complex nested logic in single statement
• Multiple responsibilities combined
• Difficult to maintain and test
• Poor code organization

Suggested Changes:

• Extract methods for different responsibilities
• Improve method organization
• Enhance readability
• Better separation of concerns

Expected Improvements

1. Better code readability
2. Easier maintenance
3. Improved testability
4. Clearer code organization
5. Better separation of concerns

Requirements

• No functional changes should be introduced
• All tests must pass
• Follow project coding standards
• Maintain backward compatibility
• Changes should be purely refactoring-focused

Next Steps

1. Review proposed changes
2. Evaluate impact on codebase
3. Consider integration strategy
4. Plan for pull request submission
5. Address any concerns raised by maintainers

Additional Notes

• All changes will follow project's code style guidelines
• Focus is on improving code quality metrics
• No API changes planned
• Will maintain existing behavior

/label refactoring code-quality implementation-smells