Documentation Generation and Mapping

class Mapper:
    """
    Maps source code to documentation objects and handles output generation.
    
    The Mapper coordinates the entire documentation generation pipeline:
    - Discovers and loads source files
    - Parses code into object representations  
    - Maps objects to documentation structure
    - Renders output using templates
    
    Attributes:
        objects (list[PythonObject]): Top-level documentation objects
        paths (list[str]): Paths to generated documentation files
    """
    
    def load(self, patterns: list[str], dirs: list[str], ignore: list[str]) -> bool:
        """
        Load and parse source files from specified directories.
        
        Args:
            patterns (list[str]): File patterns to include (e.g., ['*.py', '*.pyi'])
            dirs (list[str]): Source directories to scan
            ignore (list[str]): Patterns to ignore (e.g., ['*tests*'])
            
        Returns:
            bool: True if any source files were found and loaded
            
        Recursively discovers Python files, parses them using astroid,
        and builds the complete object hierarchy.
        """
    
    def map(self, options: list[str]) -> None:
        """
        Map loaded objects to documentation structure.
        
        Args:
            options (list[str]): AutoAPI options controlling content inclusion
            
        Processes the loaded objects according to configuration options:
        - Filters objects based on inclusion options
        - Resolves inheritance relationships
        - Builds cross-reference mappings
        - Organizes objects into documentation hierarchy
        """
    
    def output_rst(self, source_suffix: str = '.rst') -> None:
        """
        Generate reStructuredText documentation files.
        
        Args:
            source_suffix (str): File extension for generated files
            
        Renders all mapped objects to .rst files using Jinja2 templates:
        - Creates individual files for modules, classes, etc.
        - Generates index files with navigation
        - Applies custom templates if configured
        - Writes files to autoapi_root directory
        """

from autoapi._mapper import Mapper

# File pattern matching
"""The Mapper discovers source files using glob patterns:
- Default patterns: ['*.py', '*.pyi']
- Custom patterns via autoapi_file_patterns
- Recursive directory scanning
- Ignore pattern filtering
"""

# Directory structure handling
"""Supports complex project structures:
- Single-file modules
- Package hierarchies with __init__.py
- Namespace packages (PEP 420)
- Mixed source and binary distributions
"""

def load(self, patterns, dirs, ignore):
    """
    Multi-stage loading process:
    
    1. File Discovery:
       - Scan directories recursively
       - Apply include/exclude patterns
       - Build file path lists
    
    2. Parsing:
       - Parse each file with astroid
       - Handle syntax errors gracefully
       - Extract object hierarchies
    
    3. Organization:
       - Build package/module structure
       - Resolve import relationships
       - Create cross-reference mappings
    
    Returns True if any files were successfully loaded.
    """

def map(self, options):
    """
    Apply AutoAPI options to control content inclusion:
    
    Options processed:
    - 'members': Include documented members
    - 'undoc-members': Include undocumented members  
    - 'private-members': Include private members (_name)
    - 'special-members': Include special methods (__name__)
    - 'show-inheritance': Display inheritance relationships
    - 'show-module-summary': Generate module summary tables
    - 'imported-members': Include imported objects
    """

# Inheritance processing
"""The mapping stage resolves complex inheritance:
- Method Resolution Order (MRO) calculation
- Inherited member identification
- Abstract method detection
- Multiple inheritance support
- Mixin class handling
"""

# Cross-reference building
"""Creates comprehensive cross-reference data:
- Type annotation resolution
- Import alias tracking
- Inter-module references
- External package references
"""

def output_rst(self, source_suffix='.rst'):
    """
    Template-based rendering system:
    
    1. Template Selection:
       - Object type determines template (class.rst, function.rst)
       - Custom templates override defaults
       - Template inheritance supported
    
    2. Context Preparation:
       - Object properties and metadata
       - Configuration values
       - Cross-reference data
       - Sphinx-specific context
    
    3. Rendering:
       - Jinja2 template processing
       - reStructuredText generation
       - File output with proper encoding
    """

# Default templates (autoapi/templates/python/):
"""
├── base.rst              # Base template with common elements
├── index.rst             # Main API index page
├── package.rst           # Package documentation
├── module.rst            # Module documentation
├── class.rst             # Class documentation
├── function.rst          # Function documentation
├── method.rst            # Method documentation
├── property.rst          # Property documentation
├── attribute.rst         # Attribute documentation
├── data.rst              # Data/variable documentation
└── exception.rst         # Exception class documentation
"""

# Template customization
"""Custom templates can be provided via:
- autoapi_template_dir configuration
- Template inheritance from defaults
- Per-object-type template overrides
"""

# Mapper uses Sphinx configuration values:
"""
- autoapi_root: Output directory for generated files
- autoapi_own_page_level: Level for separate pages
- autoapi_member_order: Member ordering preference
- autoapi_include_summaries: Summary table generation
- autoapi_template_dir: Custom template directory
- autoapi_prepare_jinja_env: Environment customization
"""

# Generated file structure:
"""
autoapi/                  # Default autoapi_root
├── index.rst            # Main API index
├── package_name/        # Package directory
│   ├── index.rst       # Package index
│   ├── module.rst      # Module documentation
│   └── subpackage/     # Nested packages
└── _templates/         # Template overrides (if any)
"""

# Page level control:
"""
autoapi_own_page_level determines file organization:
- 'module': Each module gets own file
- 'class': Each class gets own file  
- 'function': Each function gets own file
"""

# Error handling strategies:
"""
1. Parse Errors:
   - Log syntax errors with file/line info
   - Continue processing other files
   - Generate partial documentation

2. Import Resolution:
   - Handle missing dependencies gracefully
   - Use string representations for unresolved types
   - Maintain cross-references where possible

3. Template Errors:
   - Fall back to simpler templates
   - Log rendering issues
   - Generate basic documentation over none

4. File System:
   - Handle permission issues
   - Create directories as needed
   - Atomic file writing where possible
"""

def prepare_jinja_env(jinja_env):
    """
    Customize Jinja2 environment for advanced template features.
    
    Args:
        jinja_env: Jinja2 environment instance
        
    Can be configured via autoapi_prepare_jinja_env:
    - Add custom filters
    - Register template functions
    - Configure autoescape settings
    - Add template globals
    """

# Sphinx event integration:
"""
The Mapper integrates with Sphinx events:
- autoapi-skip-member: Filter objects during mapping
- build-finished: Clean up generated files
- source-read: Populate cross-references
"""

from autoapi._mapper import Mapper

# Create and configure mapper
mapper = Mapper()

# Load source files
success = mapper.load(
    patterns=['*.py', '*.pyi'],
    dirs=['src', 'mypackage'],
    ignore=['*tests*', '*migrations*']
)

if success:
    # Map objects with options
    mapper.map([
        'members',
        'undoc-members',
        'show-inheritance',
        'show-module-summary'
    ])
    
    # Generate documentation files
    mapper.output_rst('.rst')
    
    # Access generated objects
    for obj in mapper.objects:
        print(f"Generated docs for: {obj.name}")