v0.4.3

CodeNothing Programming Language Interpreter v0.4.3 Changelog

[v0.4.3] - 2025-07-25

🚀 Major Feature: Switch Pattern Matching Expansion

• Range Matching: Added case 1..10 syntax
  • Integer ranges: case 1..100
  • Float ranges: case 0.0..1.0
  • Mixed-type range comparisons
• Guard Conditions: Added case x if condition syntax
  • Variable binding: case x if x > 0
  • Complex conditions: case x if x % 2 == 0 && x < 100
  • Dynamic condition evaluation
• Switch Expressions: Added value-returning switch expressions
  • Expression syntax: case value => expression
  • Auto-break mechanism
  • Fully compatible with existing statement form

✨ Syntax Enhancements

• Pattern Matching System: New CasePattern enum supporting multiple patterns
  • Value(Expression): Traditional value matching
  • Range(start, end): Range matching
  • Guard(var, condition): Guard condition matching
  • Destructure(pattern): Destructuring matching (reserved interface)
• Mixed Syntax Support: Different patterns can be mixed in single switch
• Type Safety: Strong type checking ensures pattern consistency

🔧 Technical Implementation

• AST Extension: Added CasePattern, SwitchType, DestructurePattern
• Parser Enhancement: Intelligent pattern recognition
  • Auto-detection of range operator ..
  • Guard condition if keyword recognition
  • Expression form => operator support
• Interpreter Optimization: Efficient pattern matching algorithm
  • Range check optimization
  • Guard condition variable binding
  • Expression evaluation caching

📝 Syntax Examples

// Range matching  
switch (score) {  
    case 90..100 => "Excellent",  
    case 80..89 => "Good",  
    default => "Needs improvement"  
};  

// Guard conditions  
switch (value) {  
    case x if x % 2 == 0 => "Even",  
    case x if x > 100 => "Large number",  
    default => "Other"  
};  

// Switch expression (reserved feature)  
grade : string = switch (score) {  
    case 90..100 => "A",  
    case 80..89 => "B",  
    default => "F"  
};  

🎯 Compatibility

• Fully Backward Compatible: Existing switch statements unchanged
• Gradual Adoption: New features can be adopted progressively
• Performance Optimized: No impact on existing code performance

🧪 Test Coverage

• Basic Tests: Core pattern matching verification
• Complex Tests: Nested/mixed patterns and edge cases
• Practical Tests: Real-world scenario simulations

🔧 Critical Fix: using file Statement Optimization

• Smart Preprocessing: Complete file import mechanism redesign

  • Recursive import support
  • Intelligent path resolution
  • Cycle detection
  • File caching optimization

• Preprocessing Stage Handling: Major architectural improvement

  • Direct file content merging
  • Zero runtime overhead
  • Clear import markers
  • Simplified AST

• Enhanced Error Handling: Better developer experience

  • Detailed error messages
  • Early error detection
  • Clear cycle import warnings

• Seamless Switch Integration:

  // patterns.cn  
  fn isEven(x : int) : bool { return x % 2 == 0; }  
  const SMALL_RANGE : int = 10;  
  
  // main.cn  
  using file "patterns.cn";  
  switch (value) {  
      case 1..SMALL_RANGE => "Small range",  
      case x if isEven(x) => "Even",  
      default => "Other"  
  }  
  

🚀 Modular Development Support

• Pattern Libraries: Reusable pattern matching libraries
• Constant Library Import: Constants for range matching
• Function Library Integration: Guard conditions using imported functions
• Large Project Support: Modular development capabilities

📈 Performance Optimization

• Preprocessing Optimization: File imports handled at compile-time
• Smart Caching: Files processed only once
• Memory Optimization: Reduced runtime memory usage

🔧 Critical Fix: Relative Path Resolution

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CodeNothing 编程语言解释器 v0.4.3 更新日志

[v0.4.3] - 2025-07-25

🚀 重大新功能：Switch 模式匹配扩展

• 范围匹配支持: 新增 case 1..10 语法
  • 整数范围: case 1..100
  • 浮点数范围: case 0.0..1.0
  • 混合类型范围比较
• Guard 条件支持: 新增 case x if condition 语法
  • 变量绑定: case x if x > 0
  • 复杂条件: case x if x % 2 == 0 && x < 100
  • 动态条件判断
• Switch 表达式支持: 新增返回值的 switch 表达式
  • 表达式语法: case value => expression
  • 自动 break 机制
  • 完全兼容现有语句形式

✨ 语法增强

• 模式匹配系统: 全新 CasePattern 枚举支持多种模式
  • Value(Expression): 传统值匹配
  • Range(start, end): 范围匹配
  • Guard(var, condition): Guard 条件匹配
  • Destructure(pattern): 解构匹配（预留接口）
• 混合语法支持: 同一 switch 支持不同模式混用
• 类型安全: 强类型检查确保模式一致性

🔧 技术实现

• AST 扩展: 新增 CasePattern、SwitchType、DestructurePattern
• 解析器增强: 智能模式识别
  • 自动检测范围操作符 ..
  • Guard 条件 if 关键字识别
  • 表达式形式 => 操作符支持
• 解释器优化: 高效模式匹配算法
  • 范围检查优化
  • Guard 条件变量绑定
  • 表达式求值缓存

📝 语法示例

// 范围匹配  
switch (score) {  
    case 90..100 => "优秀",  
    case 80..89 => "良好",  
    default => "需努力"  
};  

// Guard 条件  
switch (value) {  
    case x if x % 2 == 0 => "偶数",  
    case x if x > 100 => "大数",  
    default => "其他"  
};  

// Switch 表达式（预留功能）  
grade : string = switch (score) {  
    case 90..100 => "A",  
    case 80..89 => "B",  
    default => "F"  
};  

🎯 兼容性

• 完全向后兼容: 现有 switch 语句无需修改
• 渐进式采用: 可逐步引入新特性
• 性能优化: 不影响现有代码性能

🧪 测试覆盖

• 基础测试: 核心模式匹配验证
• 复杂测试: 嵌套/混合模式及边界条件
• 实际测试: 真实场景模拟

🔧 重大修复：using file 语句优化

• 智能预处理系统: 文件导入机制重构

  • 递归导入支持
  • 智能路径解析
  • 循环检测
  • 文件缓存优化

• 预处理阶段处理: 重大架构改进

  • 直接文件内容合并
  • 零运行时开销
  • 清晰导入标记
  • AST 简化

• 错误处理增强: 更好开发体验

  • 详细错误信息
  • 提前错误检测
  • 明确循环导入警告

• 无缝 Switch 集成:

  // patterns.cn  
  fn isEven(x : int) : bool { return x % 2 == 0; }  
  const SMALL_RANGE : int = 10;  
  
  // main.cn  
  using file "patterns.cn";  
  switch (value) {  
      case 1..SMALL_RANGE => "小范围",  
      case x if isEven(x) => "偶数",  
      default => "其他"  
  }  
  

🚀 模块化开发支持

• 模式库系统: 可重用模式匹配库
• 常量库导入: 范围匹配用常量
• 函数库集成: Guard 条件使用导入函数
• 大型项目支持: 模块化开发能力

📈 性能优化

• 预处理优化: 文件导入编译时完成
• 智能缓存: 文件仅处理一次
• 内存优化: 降低运行时内存占用

🔧 重大修复：相对路径解析问题修复

Full Changelog: CodeNothingCommunity/CodeNothing@v0.4.2...v0.4.3