# Implementation Plan

## Phase 1: Core Infrastructure

- [x] 1. Set up YAML plugin module structure


  - Create `tree_sitter_analyzer/languages/yaml_plugin.py`
  - Create `tree_sitter_analyzer/queries/yaml.py`
  - Create `tree_sitter_analyzer/formatters/yaml_formatter.py`
  - Create `tests/test_yaml/` directory for tests
  - _Requirements: Foundation for all YAML components_

- [x] 1.1 Implement YAMLElement data model


  - Add `YAMLElement` class to `tree_sitter_analyzer/models.py`
  - Include attributes: key, value, value_type, anchor_name, alias_target, nesting_level, document_index, child_count
  - Ensure YAMLElement extends CodeElement properly
  - _Requirements: 4.2_

- [x] 1.2 Write property test for YAMLElement data model

  - **Property 9: Output Schema Consistency**
  - **Validates: Requirements 4.1, 4.2**
  - Test that YAMLElement has all required attributes
  - Test serialization to JSON produces valid output

- [x] 1.3 Implement YAML queries module

  - Create `tree_sitter_analyzer/queries/yaml.py`
  - Define queries for: document, stream, block_mapping, block_sequence, flow_mapping, flow_sequence, scalars, anchor, alias, comment
  - Follow CSS/Markdown query structure
  - _Requirements: 5.1_

- [x] 1.4 Write property test for query definitions







  - **Property 11: Query Result Correctness**
  - **Validates: Requirements 5.1, 5.2, 5.3, 5.4**
  - Test that all defined queries are valid tree-sitter syntax

## Phase 2: Plugin Implementation

- [x] 2. Implement YAMLPlugin class
  - Create `YAMLPlugin` class extending `LanguagePlugin`
  - Implement `get_language_name()` returning "yaml"
  - Implement `get_file_extensions()` returning [".yaml", ".yml"]
  - Implement `create_extractor()` returning `YAMLElementExtractor`
  - Implement `get_supported_element_types()`
  - Implement `get_queries()` returning YAML_QUERIES
  - _Requirements: 3.1, 3.2_

- [x] 2.1 Implement graceful degradation for tree-sitter-yaml

  - Add try/except for tree-sitter-yaml import
  - Log warning when not available
  - Return appropriate error result when unavailable
  - _Requirements: 3.4, 6.5_


- [x] 2.2 Write property test for file extension selection

  - **Property 7: File Extension Selection**
  - **Validates: Requirements 3.2**
  - Test that .yaml and .yml files are handled by YAMLPlugin


- [x] 2.3 Implement YAMLElementExtractor class

  - Create `YAMLElementExtractor` class extending `ElementExtractor`
  - Implement `extract_functions()` returning empty list
  - Implement `extract_classes()` returning empty list
  - Implement `extract_variables()` returning empty list
  - Implement `extract_imports()` returning empty list
  - _Requirements: 1.1_



- [x] 2.4 Implement YAML element extraction methods
  - Implement `extract_yaml_elements()` main entry point
  - Implement `extract_mappings()` for key-value pairs
  - Implement `extract_sequences()` for lists
  - Implement `extract_scalars()` for single values
  - _Requirements: 1.2, 1.3, 2.1_

- [x] 2.5 Write property test for structure extraction












  - **Property 2: Structure Extraction Completeness**
  - **Validates: Requirements 1.2, 1.3, 1.4**
  - Test that all mappings, sequences, and nested structures are extracted



- [x] 2.6 Implement anchor and alias extraction
  - Implement `extract_anchors()` for &anchor definitions
  - Implement `extract_aliases()` for *alias references
  - Store anchor_name and alias_target without resolving
  - _Requirements: 2.2_


- [x] 2.7 Write property test for anchor/alias detection

  - **Property 6: Anchor and Alias Detection**
  - **Validates: Requirements 2.2**
  - Test that anchors and aliases are identified with correct names



- [x] 2.8 Implement comment extraction
  - Implement `extract_comments()` for # comments
  - Associate comments with nearby elements where possible
  - _Requirements: 2.3_

- [x] 2.9 Implement multi-document support
  - Implement `extract_documents()` for --- separated documents
  - Assign document_index to each element
  - _Requirements: 1.5_

- [x] 2.10 Write property test for multi-document separation

  - **Property 3: Multi-Document Separation**


  - **Validates: Requirements 1.5**
  - Test that each document is extracted separately with correct index

- [x] 2.11 Implement nesting level calculation
  - Calculate AST-based logical depth (not indentation)
  - Handle both Block and Flow styles consistently
  - _Requirements: 1.4_

- [x] 2.12 Checkpoint - Ensure all tests pass

  - Ensure all tests pass, ask the user if questions arise.

## Phase 3: Analysis and Formatting

- [x] 3. Implement analyze_file method
  - Implement `YAMLPlugin.analyze_file()` async method
  - Use tree-sitter-yaml for parsing
  - Return AnalysisResult with extracted elements
  - Handle encoding detection
  - _Requirements: 1.1, 4.1_

- [x] 3.1 Write property test for parsing consistency

  - **Property 1: Parsing Round-Trip Consistency**
  - **Validates: Requirements 1.1**
  - Test that parsing produces consistent results across invocations

- [x] 3.2 Implement error handling

  - Handle invalid YAML syntax with descriptive error messages
  - Attempt multiple encodings for non-UTF-8 files
  - Handle empty files gracefully
  - Handle comment-only files
  - _Requirements: 6.1, 6.2, 6.3, 6.4_

- [x]* 3.3 Write property test for error handling





  - **Property 12: Error Handling Robustness**
  - **Validates: Requirements 6.1**
  - Test that invalid YAML returns error result without crashing

- [x] 3.4 Write property test for encoding resilience

  - **Property 13: Encoding Resilience**
  - **Validates: Requirements 6.2**
  - Test that non-UTF-8 files are handled with fallback encodings


- [x] 3.5 Implement YAMLFormatter class

  - Create `YAMLFormatter` class extending `BaseFormatter`
  - Implement `format_summary()` for overview
  - Implement `format_structure()` for detailed structure
  - Implement `format_advanced()` for comprehensive analysis
  - Implement `format_table()` for tabular output
  - _Requirements: 4.3, 4.4_


- [x] 3.6 Write property test for output format support


  - **Property 10: Output Format Support**
  - **Validates: Requirements 4.3, 4.5**
  - Test that text, json, csv formats produce valid output

- [x] 3.7 Write property test for element metadata






  - **Property 4: Element Metadata Completeness**
  - **Validates: Requirements 2.4, 2.5**
  - Test that all elements have accurate start_line, end_line, raw_text

- [x] 3.8 Write property test for scalar type identification






  - **Property 5: Scalar Type Identification**
  - **Validates: Requirements 2.1**
  - Test that scalar types (string, number, boolean, null) are correctly identified



- [x] 3.9 Checkpoint - Ensure all tests pass

  - Ensure all tests pass, ask the user if questions arise.

## Phase 4: Integration

- [x] 4. Register plugin in entry points
  - Add yaml entry point to `pyproject.toml`
  - Add tree-sitter-yaml to dependencies
  - Add yaml to optional-dependencies
  - _Requirements: 3.1_

- [x] 4.1 Register formatter in formatter registry


  - Add YAMLFormatter to `tree_sitter_analyzer/formatters/formatter_registry.py`
  - Ensure formatter is selected for yaml language
  - _Requirements: 4.3_

- [x] 4.2 Write property test for language isolation






  - **Property 8: Language Isolation**
  - **Validates: Requirements 3.5**
  - Test that YAML plugin doesn't affect other language plugins





- [x] 4.3 Add YAML to MCP server capabilities
  - Update MCP server to include YAML in supported languages
  - Ensure YAML tools work through MCP interface
  - _Requirements: 7.3_

- [x] 4.4 Checkpoint - Ensure all tests pass
  - Ensure all tests pass, ask the user if questions arise.


## Phase 5: Testing and Documentation



- [x] 5. Create sample YAML test files
  - Create `examples/sample_config.yaml` with comprehensive YAML features
  - Include mappings, sequences, anchors, aliases, multi-document
  - Create edge case files (empty, comments-only, invalid)
  - _Requirements: 7.1, 7.2_

- [x] 5.1 Create golden master test
  - Add YAML golden master to `tests/golden_masters/`
  - Ensure output stability across versions
  - _Requirements: 7.4_

- [x] 5.2 Create integration tests
  - Test CLI integration with YAML files
  - Test MCP tool integration
  - Test plugin manager registration
  - _Requirements: 7.3_

- [x] 5.3 Update documentation


  - Update README.md with YAML support information
  - Add YAML to supported languages list
  - Document YAML-specific features and queries
  - _Requirements: Documentation_

- [x] 5.4 Final checkpoint - Ensure all tests pass



  - Ensure all tests pass, ask the user if questions arise.
  - Run full test suite
  - Verify cross-platform compatibility
  - Check that all requirements are met
