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Releases v1.9.0 (#106)
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‎CHANGELOG.md‎

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## [Unreleased]
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## [1.9.0] 2025-09-09
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### Added
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#### Enhanced Data Model Support
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- **`Statifier.active_leaf_states/1`**: Added public API function to retrieve only leaf states from active configuration
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- **Leaf State Focus**: Returns only the leaf (atomic) states that are currently active, excluding ancestor states
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- **MapSet Return**: Returns active leaf states as a MapSet for efficient membership testing and set operations
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- **Public API**: Provides direct access to leaf state information for client applications
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- **Documentation**: Comprehensive function documentation with clear usage examples
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#### Enhanced Event Processing Improvements
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- **SCXML-Compliant Event Matching**: Complete implementation of W3C SCXML event matching patterns
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- **Universal Wildcard**: "*" matches any event name per SCXML specification
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- **Prefix Matching**: "foo" matches "foo", "foo.bar", "foo.bar.baz" with dot-separated token logic
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- **OR Pattern Support**: "foo bar" matches events that match "foo" OR "bar" (space-separated alternatives)
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- **Wildcard Suffix**: "foo.*" matches "foo.bar", "foo.baz" but not "foo" (requires additional tokens)
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- **Token-Based Logic**: Proper dot-separated token parsing for hierarchical event names
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- **Error Event Generation**: Comprehensive error.execution event generation per SCXML specification
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- **Assign Action Errors**: Failed assignments now generate error.execution events with detailed context
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- **Error Event Structure**: Events include reason, type, location, and expression information
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- **Internal Event Queue**: Error events properly queued as internal events for processing
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- **Graceful Error Handling**: State machine continues execution after logging errors
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#### Strict Nested Assignment Validation
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- **Enhanced Datamodel Validation**: Strict checking for nested map assignments to prevent auto-creation
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- **Intermediate Structure Validation**: Assignments to nested paths require all intermediate structures to exist
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- **Type Safety**: Prevents assignment to non-map intermediate values with clear error messages
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- **SCXML Compliance**: Aligns with proper SCXML datamodel semantics for assignment operations
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- **Error Reporting**: Detailed error messages indicating specific validation failures
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### Changed
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#### Test Infrastructure Improvements
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- **Updated Internal Tests**: Modified 9 internal tests to expect strict nested assignment behavior
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- **Correct SCXML Behavior**: Tests now verify proper failure when attempting to assign to non-existent intermediate structures
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- **Error Expectation**: Tests properly expect {:error, reason} responses for invalid assignments
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- **Maintained Coverage**: All test updates preserve comprehensive test coverage
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#### Event Processing Updates
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- **Enhanced Event Module**: Improved event matching capabilities with comprehensive pattern support
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- **Robust Pattern Matching**: Handles complex event patterns with proper token parsing
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- **Performance Optimization**: Efficient string splitting and token comparison algorithms
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- **Comprehensive Testing**: Full test coverage for all event matching scenarios
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### Fixed
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#### Code Quality Improvements
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- **Removed Unnecessary Validation**: Eliminated whitespace validation from Evaluator resolve_location functions
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- **Simplified Logic**: Removed redundant whitespace checking that wasn't addressing root issues
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- **Cleaner Implementation**: Focus on core location resolution functionality without extra validation layers
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- **Performance**: Reduced unnecessary string processing in location resolution
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#### Datamodel Assignment Fixes
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- **Strict Assignment Implementation**: Fixed auto-creation of intermediate map structures in nested assignments
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- **Prevented Invalid Behavior**: No longer auto-creates intermediate maps when assigning to nested paths
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- **Proper Error Handling**: Clear error messages when attempting to assign to non-existent intermediate structures
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- **SCXML Compliance**: Aligns with W3C SCXML specification for datamodel assignment semantics
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### Technical Improvements
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#### Enhanced Test Coverage
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- **Comprehensive Event Testing**: Added extensive tests for SCXML event matching patterns
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- **Universal Wildcard Tests**: Verification that "*" matches all event types
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- **Prefix Pattern Tests**: Testing hierarchical event matching with dot notation
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- **OR Logic Tests**: Validation of space-separated alternative event patterns
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- **Wildcard Suffix Tests**: Complex wildcard pattern testing with proper token requirements
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- **Coverage Achievement**: Improved test coverage to 90.1% (up from 89.7%)
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#### Developer Experience
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- **Enhanced Error Messages**: Improved error context and logging throughout assignment operations
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- **Structured Logging**: Comprehensive logging with metadata for debugging assignment failures
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- **Debug Support**: Enhanced debugging capabilities with elixir log adapter recommendations
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### Examples
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#### Event Matching Patterns
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```xml
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<!-- Universal wildcard - matches any event -->
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<transition event="*" target="catch_all"/>
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<!-- Prefix matching - matches "user", "user.login", "user.logout" -->
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<transition event="user" target="user_handler"/>
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<!-- OR patterns - matches "start" OR "begin" OR "init" -->
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<transition event="start begin init" target="startup"/>
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<!-- Wildcard suffix - matches "system.error", "system.warning" but not "system" -->
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<transition event="system.*" target="system_handler"/>
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```
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#### Error Event Handling
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```xml
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<state id="processing">
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<onentry>
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<!-- This will generate error.execution event if foo doesn't exist -->
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<assign location="foo.bar" expr="'value'"/>
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</onentry>
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<!-- Handle assignment errors -->
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<transition event="error.execution" target="error_state">
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<log expr="'Assignment failed: ' + _event.data.reason"/>
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</transition>
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</state>
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```
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#### Strict Assignment Validation
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```elixir
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# This will now fail with proper error instead of auto-creating structures
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{:error, reason} = Datamodel.put_in_path(%{}, ["foo", "bar"], "value")
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# reason: "Cannot assign to nested path: 'foo' does not exist"
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# Proper usage requires intermediate structures to exist
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datamodel = %{"foo" => %{}}
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{:ok, updated} = Datamodel.put_in_path(datamodel, ["foo", "bar"], "value")
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# updated: %{"foo" => %{"bar" => "value"}}
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```
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### Migration Notes
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- **Event Matching**: Existing event patterns continue to work with enhanced capabilities
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- **Assignment Behavior**: Code relying on auto-creation of intermediate structures may need updates
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- **Error Handling**: New error.execution events provide better error visibility and handling
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- **Test Coverage**: Internal tests updated to reflect correct SCXML assignment behavior
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### Notes
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- **Enhanced SCXML Compliance**: Improved adherence to W3C SCXML specification for event processing and datamodel operations
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- **Better Error Handling**: Comprehensive error event generation and structured error reporting
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- **Robust Event Processing**: Full implementation of SCXML event matching patterns with proper token-based logic
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- **Strict Datamodel Semantics**: Proper validation of nested assignments prevents unexpected behavior
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- **Test Coverage Improvement**: Achieved 90.1% test coverage with comprehensive event matching tests
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## [1.8.0] 2025-09-02
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### Added

‎CLAUDE.md‎

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**Testing:**
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- `mix test` - Run all internal tests (excludes SCION/W3C by default) - 444 tests
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- `mix test` - Run all internal tests (excludes SCION/W3C by default) - 1045 tests
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- `mix test --include scion --include scxml_w3` - Run all tests including SCION and W3C tests
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- `mix test.regression` - Run regression tests that should always pass - 63 tests (critical functionality)
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- `mix test.baseline` - Check which tests are currently passing (for updating regression suite)
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- `mix test --cover` - Run all tests with coverage reporting (maintain 90%+ coverage - currently 92.3%)
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- `mix test --cover` - Run all tests with coverage reporting (maintain 90%+ coverage - currently 90.1%)
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- `mix coveralls` - Alternative coverage command
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- `mix coveralls.detail` - Run tests with detailed coverage report showing uncovered lines
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- `mix test test/statifier/location_test.exs` - Run location tracking tests

‎README.md‎

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```elixir
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def deps do
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[
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{:statifier, "~> 1.8"}
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{:statifier, "~> 1.9"}
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]
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end
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```

‎docs/installation.md‎

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```elixir
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def deps do
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[
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{:statifier, "~> 1.8"}
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{:statifier, "~> 1.9"}
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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 "1.8.0"
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@version "1.9.0"
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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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