# Requirements Document

## Introduction

本规范旨在将 Tree-sitter Analyzer 项目的测试覆盖率从当前的 **79.06%**（12808/16201 行）提升到 **100%**。通过系统性地测试所有未覆盖的代码路径、边界情况和错误处理逻辑，确保项目达到生产级质量标准，为用户提供可靠、稳定的代码分析工具。

### 当前覆盖率状况

**总体统计：**
- 需要改进的文件总数：**88 个文件**
- 未覆盖代码行数：**3,393 行**（占总代码的 20.94%）

**按覆盖率分类：**

**严重不足（< 50%）- 7 个文件，共 514 行未覆盖：**
- `cli/__main__.py`: 0.0% (1 行)
- `utils/__init__.py`: 22.2% (45 行)
- `utils/tree_sitter_compat.py`: 34.0% (92 行)
- `formatters/java_formatter.py`: 39.9% (91 行)
- `interfaces/mcp_server.py`: 40.8% (60 行)
- `mcp/tools/universal_analyze_tool.py`: 44.9% (82 行)
- `exceptions.py`: 50.4% (137 行)

**中等不足（50-75%）- 23 个文件，共 1,584 行未覆盖：**
- `utils.py`: 52.0% (107 行)
- `cli/commands/summary_command.py`: 59.5% (18 行)
- `queries/html.py`: 59.5% (11 行)
- `queries/css.py`: 61.5% (11 行)
- `core/engine.py`: 62.3% (77 行)
- `core/query.py`: 63.4% (74 行)
- `cli/commands/find_and_grep_cli.py`: 65.8% (35 行)
- `formatters/markdown_formatter.py`: 66.4% (93 行)
- `language_loader.py`: 66.7% (41 行)
- `cli/commands/list_files_cli.py`: 68.2% (20 行)
- `cli/commands/search_content_cli.py`: 68.5% (24 行)
- `formatters/base_formatter.py`: 68.5% (22 行)
- `languages/markdown_plugin.py`: 68.6% (303 行)
- `security/boundary_manager.py`: 68.8% (34 行)
- `formatters/html_formatter.py`: 70.2% (87 行)
- `plugins/base.py`: 71.1% (38 行)
- `languages/typescript_plugin.py`: 71.7% (221 行)
- `encoding_utils.py`: 72.0% (53 行)
- `language_detector.py`: 72.3% (24 行)
- `cli/__init__.py`: 72.7% (3 行)
- `cli/commands/table_command.py`: 73.0% (29 行)
- `api.py`: 73.8% (66 行)
- `mcp/utils/__init__.py`: 74.1% (7 行)

**轻微不足（75-90%）- 35 个文件，共 1,009 行未覆盖：**
- 包括 `languages/css_plugin.py` (74.1%, 44 行)
- `file_handler.py` (75.0%, 20 行)
- `languages/html_plugin.py` (75.4%, 41 行)
- `query_loader.py` (75.7%, 25 行)
- `languages/python_plugin.py` (76.6%, 146 行)
- `languages/javascript_plugin.py` (76.6%, 161 行)
- `languages/java_plugin.py` (76.8%, 144 行)
- `core/parser.py` (76.6%, 21 行)
- `core/cache_service.py` (76.8%, 21 行)
- `cli/commands/advanced_command.py` (77.9%, 22 行)
- `output_manager.py` (78.0%, 19 行)
- `table_formatter.py` (78.2%, 77 行)
- `security/validator.py` (78.7%, 51 行)
- `mcp/server.py` (78.7%, 82 行)
- 以及其他 21 个文件

**接近完成（90-99%）- 23 个文件，共 286 行未覆盖：**
- 包括 `constants.py` (90.5%, 1 行)
- `cli_main.py` (92.8%, 10 行)
- `interfaces/mcp_adapter.py` (93.3%, 5 行)
- `mcp/tools/analyze_scale_tool.py` (93.3%, 9 行)
- `formatters/formatter_factory.py` (95.7%, 1 行)
- `formatters/python_formatter.py` (96.1%, 7 行)
- `formatters/javascript_formatter.py` (96.6%, 8 行)
- `queries/markdown.py` (97.5%, 0 行)
- `formatters/typescript_formatter.py` (98.0%, 2 行)
- `formatters/formatter_registry.py` (98.5%, 2 行)
- `mcp/tools/analyze_scale_tool_cli_compatible.py` (99.0%, 0 行)
- 以及其他 12 个文件

## Glossary

- **Tree-sitter Analyzer**: 基于 Tree-sitter 的多语言代码解析工具
- **Coverage**: 测试覆盖率，衡量代码被测试执行的比例
- **Property-Based Testing (PBT)**: 基于属性的测试方法，通过生成随机输入验证程序属性
- **Unit Test**: 单元测试，验证单个函数或方法的正确性
- **Integration Test**: 集成测试，验证多个组件协同工作的正确性
- **MCP**: Model Context Protocol，AI 助手集成协议
- **Plugin**: 语言插件，提供特定编程语言的解析支持
- **Formatter**: 格式化器，将解析结果转换为特定输出格式
- **Query**: Tree-sitter 查询，用于从 AST 中提取特定模式

## Requirements

### Requirement 1: Utils Module Coverage Improvement

**User Story:** As a developer, I want the utils module to be thoroughly tested, so that utility functions work reliably across the codebase.

#### Acceptance Criteria

1. WHEN the tree_sitter_compat module handles different tree-sitter versions THEN the system SHALL provide consistent API behavior regardless of version
2. WHEN utility functions process edge case inputs (empty, None, special characters) THEN the system SHALL handle them gracefully without exceptions
3. WHEN logging utilities are configured THEN the system SHALL produce correctly formatted log output
4. WHEN compatibility wrappers are used THEN the system SHALL maintain backward compatibility with older tree-sitter APIs

### Requirement 2: Java Formatter Coverage Improvement

**User Story:** As a developer, I want the Java formatter to be fully tested, so that Java code analysis output is accurate and consistent.

#### Acceptance Criteria

1. WHEN the Java formatter processes class definitions THEN the system SHALL correctly format class names, modifiers, and inheritance
2. WHEN the Java formatter handles annotations THEN the system SHALL include annotation details in the output
3. WHEN the Java formatter processes methods with generics THEN the system SHALL correctly represent generic type parameters
4. WHEN the Java formatter serializes results to JSON THEN deserializing SHALL produce equivalent data structures

### Requirement 3: MCP Server and Tools Coverage Improvement

**User Story:** As a developer, I want MCP server and tools to be fully tested, so that AI assistant integration is reliable.

#### Acceptance Criteria

1. WHEN the MCP server receives a valid tool request THEN the system SHALL execute the tool and return structured results
2. WHEN the universal_analyze_tool processes a file THEN the system SHALL return complete analysis results
3. WHEN the MCP server handles invalid requests THEN the system SHALL return appropriate error responses
4. WHEN MCP tools access files outside project boundaries THEN the system SHALL reject the request with a security error

### Requirement 4: Exception Handling Coverage Improvement

**User Story:** As a developer, I want all exception types to be tested, so that error handling is comprehensive and informative.

#### Acceptance Criteria

1. WHEN a specific exception type is raised THEN the system SHALL include relevant context information in the error message
2. WHEN exceptions are serialized for logging THEN the system SHALL produce readable and complete error information
3. WHEN exception chains occur THEN the system SHALL preserve the original cause information
4. WHEN custom exceptions are caught THEN the system SHALL allow appropriate recovery or re-raising

### Requirement 5: Core Engine and Query Coverage Improvement

**User Story:** As a developer, I want the core engine and query modules to be fully tested, so that code analysis is accurate.

#### Acceptance Criteria

1. WHEN the engine parses source code with syntax errors THEN the system SHALL return partial results with error indicators
2. WHEN the query module executes complex patterns THEN the system SHALL correctly match all qualifying nodes
3. WHEN the engine processes large files THEN the system SHALL complete analysis within acceptable time limits
4. WHEN query results are filtered THEN the system SHALL apply all filter criteria correctly

### Requirement 6: Language Plugin Coverage Improvement

**User Story:** As a developer, I want language plugins (especially Markdown and TypeScript) to be fully tested, so that language-specific parsing is accurate.

#### Acceptance Criteria

1. WHEN the Markdown plugin parses documents with mixed content THEN the system SHALL correctly identify all element types (headers, code blocks, links, tables)
2. WHEN the TypeScript plugin processes complex type definitions THEN the system SHALL correctly extract interface and type information
3. WHEN language plugins handle framework-specific patterns THEN the system SHALL identify framework annotations correctly
4. WHEN language plugins serialize results THEN deserializing SHALL produce equivalent structural information

### Requirement 7: Edge Cases and Error Paths Coverage

**User Story:** As a developer, I want all edge cases and error handling paths to be tested, so that the system behaves correctly in all scenarios.

#### Acceptance Criteria

1. WHEN the system receives empty input THEN the system SHALL handle it gracefully and return appropriate empty results
2. WHEN the system encounters file encoding issues THEN the system SHALL attempt fallback encodings or report clear encoding errors
3. WHEN the system processes files with unusual line endings THEN the system SHALL normalize them correctly
4. WHEN the system handles concurrent operations THEN the system SHALL maintain thread safety and data consistency
5. WHEN the system reaches resource limits THEN the system SHALL fail gracefully with informative error messages

### Requirement 8: Branch Coverage Completion

**User Story:** As a developer, I want all conditional branches to be tested, so that all code paths are verified.

#### Acceptance Criteria

1. WHEN conditional logic evaluates to true THEN the system SHALL execute the true branch correctly
2. WHEN conditional logic evaluates to false THEN the system SHALL execute the false branch correctly
3. WHEN multiple conditions are combined with AND/OR THEN the system SHALL test all logical combinations
4. WHEN switch/case statements are used THEN the system SHALL test all cases including default
5. WHEN exception handlers are present THEN the system SHALL test both success and exception paths

### Requirement 9: Integration and End-to-End Coverage

**User Story:** As a developer, I want integration scenarios to be fully tested, so that components work together correctly.

#### Acceptance Criteria

1. WHEN multiple components interact in a workflow THEN the system SHALL complete the workflow successfully
2. WHEN the CLI invokes core analysis functions THEN the system SHALL produce correct output
3. WHEN the MCP server uses language plugins and formatters THEN the system SHALL return properly formatted results
4. WHEN caching is enabled THEN the system SHALL return cached results on subsequent identical requests
5. WHEN the system processes a complete project THEN the system SHALL analyze all files and aggregate results correctly

### Requirement 10: Property-Based Testing for Critical Functions

**User Story:** As a developer, I want critical functions to be tested with property-based testing, so that they work correctly across a wide range of inputs.

#### Acceptance Criteria

1. WHEN parsers process randomly generated valid code THEN the system SHALL successfully parse and extract structure
2. WHEN formatters receive randomly generated analysis results THEN the system SHALL produce valid output
3. WHEN serialization round-trips occur THEN the system SHALL preserve data integrity (serialize then deserialize equals original)
4. WHEN query patterns are applied to random ASTs THEN the system SHALL return consistent results
5. WHEN security validators check random paths THEN the system SHALL correctly identify valid and invalid paths
