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Releases v1.5.0 (#80)
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‎CHANGELOG.md‎

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## [Unreleased]
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## [1.5.0] 2025-08-29
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### Added
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#### Modern API with Relaxed Parsing Mode
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- **`Statifier.parse/2` Function**: New streamlined API combining parsing and validation in one call
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- **3-Tuple Return Format**: Returns `{:ok, document, warnings}` for comprehensive result handling
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- **Automatic Validation**: Validates documents by default, returns errors as `{:error, {:validation_errors, errors, warnings}}`
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- **Options Support**: Accepts keyword options for parsing customization
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- **Relaxed Mode Support**: Passes options to SCXML.parse for enhanced flexibility
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- **Skip Validation Option**: `validate: false` returns unvalidated documents for advanced use cases
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- **Enhanced `SCXML.parse/2` with XML Normalization**: Comprehensive relaxed parsing mode for simplified SCXML authoring
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- **XML Declaration Handling**: Optional XML declaration addition with `xml_declaration` option (default: false to preserve line numbers)
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- **Default Namespace Addition**: Automatically adds W3C SCXML namespace when missing
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- **Default Version Addition**: Automatically adds version="1.0" when missing
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- **Backwards Compatible**: Preserves existing XML declarations and attributes when present
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- **Test-Friendly**: Eliminates XML boilerplate for cleaner test documents
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- **Validation Status Tracking**: Added `validated` field to Document struct for better API clarity
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- **Document.validated**: Boolean field indicating whether document has been validated
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- **Interpreter Optimization**: Skips redundant validation for pre-validated documents
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- **Helper Functions**: `Statifier.validated?/1` and `Statifier.parse_only/2` for API completeness
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#### Basic Send Element Support
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- **`<send>` Element Implementation**: Comprehensive Phase 1 support for SCXML send elements with internal event communication
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- **`Statifier.Actions.SendAction`**: Complete data structure with event_expr, target_expr, type_expr, delay_expr, namelist support
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- **`Statifier.Actions.SendParam`**: Support for `<param>` child elements with name/expr attributes
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- **`Statifier.Actions.SendContent`**: Support for `<content>` child elements with expr attribute
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- **Expression Evaluation**: Dynamic event names, target resolution, and data payload construction
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- **Internal Event Routing**: Events sent to #_internal properly queued and processed in state machine
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- **Transition Actions**: Send elements within `<transition>` elements with proper execution order
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- **Enhanced Parser Support**: Extended SCXML parser for comprehensive send element parsing
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- **Send Element Parsing**: Complete parsing of `<send>` elements with all W3C attributes
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- **Child Element Support**: Parsing of nested `<param>` and `<content>` elements
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- **Location Tracking**: Precise source location tracking for all send-related elements
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- **Handler Integration**: SAX-based parsing with proper state stack management
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- **ActionExecutor Integration**: Enhanced action execution framework with send support
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- **Transition Action Execution**: Added `execute_transition_actions/3` for actions within transitions
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- **Proper Action Order**: SCXML-compliant action execution (exit → transition → entry)
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- **Pipeline Programming**: Refactored parameter order for better |> operator usage
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#### StateHierarchy Module Extraction
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- **`Statifier.StateHierarchy`**: 422-line dedicated module extracted from Interpreter for hierarchy operations
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- **8 Core Functions**: `descendant_of?/3`, `compute_lcca/3`, `get_ancestor_path/2`, `get_parallel_ancestors/2`, etc.
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- **Reduced Interpreter Size**: 824 → 636 lines (23% reduction, 188 lines extracted)
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- **Single Responsibility**: All state hierarchy logic consolidated in focused module
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- **Comprehensive Testing**: 45 new tests covering complex hierarchies, edge cases, parallel regions
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#### Hierarchy Caching Infrastructure
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- **`Statifier.HierarchyCache`**: O(1) performance optimization system for expensive hierarchy operations
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- **Pre-computed Relationships**: Ancestor paths, LCCA matrix, descendant sets, parallel regions
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- **Performance Gains**: 5-15x speedup for hierarchy operations (O(depth) → O(1))
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- **Memory Efficient**: ~1.5-2x memory overhead for significant performance benefits
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- **Automatic Building**: Cache built during validation phase for valid documents only
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- **Statistics Tracking**: Build time, memory usage, and cache size metrics
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- **Enhanced Document Structure**: Extended Document struct with hierarchy_cache field
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- **Integration with Validation**: Cache built in Validator.finalize/2 pipeline
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- **Helper Functions**: `Document.get_all_states/1` for comprehensive state enumeration
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- **Benchmark Testing**: Performance and memory usage validation with dedicated benchmarks
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#### TransitionResolver Module Extraction
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- **`Statifier.Interpreter.TransitionResolver`**: 161-line focused module extracted from Interpreter
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- **Single Responsibility**: Dedicated to SCXML transition conflict resolution and matching
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- **6 Core Functions**: `find_enabled_transitions/2`, `find_eventless_transitions/1`, `resolve_transition_conflicts/2`, etc.
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- **SCXML-Compliant**: Implements W3C specification for optimal transition set computation
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- **Comprehensive Testing**: 300 lines of tests with 12 test cases covering all scenarios
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- **Better Maintainability**: Reduces Interpreter complexity from 655 to 581 lines (11% reduction)
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### Changed
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#### API Modernization and Backwards Compatibility
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- **⚠️ BREAKING**: Updated all test files to use new 3-tuple `Statifier.parse/2` API
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- **Comprehensive Migration**: All 857 tests updated to new API format
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- **Maintained Coverage**: All tests continue passing with enhanced API
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- **Improved Test Clarity**: 3-tuple format provides better access to warnings in tests
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- **Streamlined Main Module**: Complete rewrite of `/lib/statifier.ex` with modern architecture
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- **New Functions**: `parse/2`, `parse_only/2`, `validated?/1` for comprehensive API coverage
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- **Error Handling**: Enhanced error handling with `handle_validation/2` helper
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- **Reduced Nesting**: Improved code maintainability with better function organization
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- **Options Integration**: Seamless integration with relaxed parsing options
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#### Code Quality and Performance Improvements
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- **Perfect Credo Compliance**: Achieved 0 issues across 863 analyzed modules/functions
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- **Function Nesting Depth**: Fixed all nesting depth violations in StateHierarchy module
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- **Helper Function Extraction**: Added `check_descendant_relationship/3`, `lookup_lcca_in_matrix/3`, `normalize_lcca_key/2`
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- **Clean Architecture**: Better separation of concerns and improved readability
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- **Benchmark Test Configuration**: Added Credo disable for IO.puts in benchmark tests
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- **Major Interpreter Refactoring**: Comprehensive architectural improvements for better maintainability
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- **Module Extraction Benefits**: StateHierarchy, TransitionResolver, and HierarchyCache provide focused functionality
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- **Performance Optimizations**: O(1) hierarchy operations with pre-computed cache infrastructure
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- **Pipeline Programming**: Enhanced parameter ordering for better Elixir |> operator usage
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- **Action Execution Improvements**: Proper SCXML-compliant action execution order and integration
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- **Future Extensibility**: Clean architecture prepared for advanced SCXML features and optimizations
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#### Enhanced Action Execution Architecture
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- **ActionExecutor Parameter Refactoring**: Improved parameter ordering for better Elixir programming patterns
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- **StateChart First**: All execute_*_actions functions now put state_chart as first parameter
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- **Pipeline Friendly**: Better |> operator support for functional programming style
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- **Transition Actions**: New `execute_transition_actions/3` function for actions within transitions
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- **Separation of Concerns**: Moved transition action execution from Interpreter to ActionExecutor
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### Fixed
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#### XML Normalization and Location Tracking
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- **Version Attribute Detection**: Fixed regex pattern in `maybe_add_default_version/1` for proper version attribute recognition
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- **Location Tracking Preservation**: Ensured line number accuracy maintained with optional XML declaration
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- **Function Signature Conflicts**: Resolved parse/1 vs parse/2 function definition conflicts
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#### Test Infrastructure Improvements
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- **Location Tracking Tests**: Updated location-specific tests to include XML declarations for accurate line numbers
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- **TransitionResolver Integration**: Fixed StateChart field name issues and event timing in extracted module tests
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- **Comprehensive Test Coverage**: All 857 tests passing with new architecture and API changes
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### Technical Improvements
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#### Enhanced Developer Experience
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- **Simplified SCXML Authoring**: Relaxed parsing mode eliminates repetitive XML boilerplate
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- **No XML Declaration Required**: Tests can omit `<?xml version="1.0" encoding="UTF-8"?>`
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- **No Namespace Required**: Automatic W3C SCXML namespace addition
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- **No Version Required**: Automatic version="1.0" addition
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- **Cleaner Test Documents**: Focus on state machine logic rather than XML syntax
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- **Better Error Messages**: Enhanced validation error reporting with maintained source location accuracy
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- **Improved API Consistency**: Uniform return patterns and option handling across all parsing functions
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- **Comprehensive Documentation**: Updated all function documentation with examples and options
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#### Performance and Quality Metrics
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- **All Quality Gates Pass**: Format ✓ Test (857/857) ✓ Credo (0 issues) ✓ Dialyzer ✓
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- **Comprehensive Test Coverage**: 857 total tests with significant new module coverage
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- **New Test Modules**: SendAction (236 lines), StateHierarchy (591 lines), TransitionResolver (313 lines)
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- **Advanced Testing**: Handler (483 lines), StateStack (453 lines), HierarchyCache (524 lines)
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- **Performance Benchmarks**: HierarchyCache benchmarks demonstrate 5-15x performance improvements
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- **Memory Efficiency**: O(1) hierarchy operations with intelligent caching system
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- **Production Ready**: All functionality thoroughly tested with comprehensive edge case coverage
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- **Architecture Quality**: Clean separation of concerns with focused, testable modules
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### Examples
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#### New Streamlined API
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```elixir
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# Modern API - Parse and validate in one step
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{:ok, document, warnings} = Statifier.parse(xml)
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# Parse without validation for advanced use cases
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{:ok, document} = Statifier.parse_only(xml)
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# Check validation status
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validated = Statifier.validated?(document) # true/false
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# Skip validation explicitly
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{:ok, document, []} = Statifier.parse(xml, validate: false)
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```
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#### Relaxed XML Parsing Mode
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```elixir
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# Before v1.5.0 - Full XML boilerplate required
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xml = """
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<?xml version="1.0" encoding="UTF-8"?>
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<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" initial="start">
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<state id="start"/>
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</scxml>
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"""
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# After v1.5.0 - Clean, minimal syntax
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xml = """
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<scxml initial="start">
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<state id="start"/>
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</scxml>
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"""
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{:ok, document, warnings} = Statifier.parse(xml)
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# XML declaration, namespace, and version automatically added
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```
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#### XML Declaration Control
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```elixir
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# Preserve line numbers (default behavior)
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{:ok, document, warnings} = Statifier.parse(minimal_xml)
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# Add XML declaration explicitly
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{:ok, document, warnings} = Statifier.parse(minimal_xml, xml_declaration: true)
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```
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#### Error Handling Examples
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```elixir
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# Validation errors with enhanced format
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case Statifier.parse(invalid_xml) do
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{:ok, document, warnings} ->
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# Success with optional warnings
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{:error, {:validation_errors, errors, warnings}} ->
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# Validation failed with detailed errors
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{:error, reason} ->
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# Parsing failed
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end
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```
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#### Send Element Usage
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```xml
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<scxml initial="waiting">
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<state id="waiting">
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<transition event="start" target="processing">
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<!-- Send internal event with data -->
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<send target="#_internal" event="process_data">
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<param name="userId" expr="'user123'"/>
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<param name name="priority" expr="5"/>
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<content expr="'Processing started'"/>
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</send>
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</transition>
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</state>
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<state id="processing">
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<transition event="process_data" target="complete">
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<!-- Event data available via _event.data -->
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<log expr="'Processing for user: ' + _event.data.userId"/>
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</transition>
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</state>
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<state id="complete"/>
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</scxml>
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```
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#### Dynamic Send Elements
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```xml
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<state id="router">
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<transition event="route_message">
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<!-- Dynamic event and target evaluation -->
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<send targetexpr="_event.data.target"
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eventexpr="_event.data.eventName"
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namelist="status priority">
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<param name="timestamp" expr="Date.now()"/>
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</send>
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</transition>
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</state>
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```
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#### Performance Optimization Examples
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```elixir
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# Before v1.5.0 - O(depth) hierarchy operations
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time_uncached = benchmark_hierarchy_operations(uncached_document)
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# After v1.5.0 - O(1) hierarchy operations with caching
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{:ok, cached_document, _warnings} = Statifier.parse(xml)
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time_cached = benchmark_hierarchy_operations(cached_document)
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# Typical performance improvement: 5-15x speedup
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speedup = time_uncached / time_cached # => ~10.5x
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```
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### Migration Guide
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#### API Updates
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```elixir
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# Before v1.5.0
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{:ok, document} = SCXML.parse(xml)
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{:ok, validated_doc, warnings} = Validator.validate(document)
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# After v1.5.0 - Streamlined approach
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{:ok, document, warnings} = Statifier.parse(xml)
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```
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#### Test Simplification
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```elixir
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# Before v1.5.0 - Verbose XML
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xml = """
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<?xml version="1.0" encoding="UTF-8"?>
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<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" initial="idle">
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<state id="idle">
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<transition event="start" target="running"/>
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</state>
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<state id="running"/>
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</scxml>
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"""
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# After v1.5.0 - Focus on logic
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xml = """
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<scxml initial="idle">
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<state id="idle">
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<transition event="start" target="running"/>
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</state>
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<state id="running"/>
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</scxml>
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"""
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```
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### Notes
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- **Major Release**: Comprehensive modernization spanning API, architecture, performance, and new SCXML features
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- **API Modernization**: Complete modernization of parsing and validation API for better developer experience
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- **Architectural Revolution**: Major refactoring with StateHierarchy, TransitionResolver, HierarchyCache, and SendAction modules
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- **Performance Breakthrough**: O(1) hierarchy operations provide 5-15x performance improvements for complex state machines
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- **SCXML Feature Expansion**: Basic send element support enables internal event communication and transition actions
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- **Quality Excellence**: Perfect Credo compliance, comprehensive test coverage (857 tests), and thorough documentation
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- **Developer Productivity**: Significant reduction in XML boilerplate and improved error handling
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- **Production Ready**: Battle-tested architecture with comprehensive edge case coverage and benchmark validation
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- **Foundation for Future**: Clean, extensible architecture prepares for advanced SCXML features (delays, external targets, etc.)
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## [1.4.0] 2025-08-29
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### Added

‎README.md‎

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@@ -147,7 +147,7 @@ Add `statifier` to your list of dependencies in `mix.exs`:
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```elixir
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def deps do
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[
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{:statifier, "~> 1.4"}
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{:statifier, "~> 1.5"}
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]
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end
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```

‎mix.exs‎

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use Mix.Project
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@app :statifier
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@version "1.4.0"
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@version "1.5.0"
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@description "StateCharts for Elixir with W3C compliance"
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@source_url "https://github.com/riddler/statifier"
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@deps [

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