Adds required features to SCION and SCXML tests by johnnyt · Pull Request #12 · riddler/sc

This repository was archived by the owner on Sep 12, 2025. It is now read-only.

CLAUDE.md

-Original file line number
+Diff line change
@@ Expand Up @@
     ## Dependencies
+    - **`predicator`** (~> 2.0) - Safe condition (boolean predicate) evaluator
     - **`saxy`** (~> 1.6) - Fast, memory-efficient SAX XML parser with position tracking support
     ## Development Dependencies
@@ Expand Down Expand Up @@
     - **Modular validator architecture** - refactored from 386-line monolith into focused modules
     - **Full Credo compliance** - all code quality issues resolved
-    🚧 **Future Extensions:**
+    ## SCXML Feature Implementation Roadmap
-    - History states (`<history>`) - missing from parser and interpreter
-    - Internal transitions (`type="internal"`) and targetless transitions
-    - Executable content elements (`<onentry>`, `<onexit>`, `<raise>`, `<assign>`, `<script>`, `<send>`)
-    - Enhanced datamodel support with more expression functions
-    - Enhanced validation for complex SCXML constructs
-    - Additional parser formats (JSON, YAML) leveraging same validation/optimization pipeline
+    📋 **Comprehensive Implementation Plan Available**: See `documentation/SCXML_IMPLEMENTATION_PLAN.md` for detailed 3-phase roadmap to achieve 98%+ test coverage across 444 SCION and W3C tests.
-    The implementation follows the W3C SCXML specification closely and includes comprehensive test coverage from both W3C and SCION test suites. The current interpreter provides a solid foundation for basic SCXML functionality with clear areas identified for future enhancement.
+    ### Current Implementation Status (Phase 0 - Complete)
+    ✅ **Structural SCXML Features** - Complete W3C compliance for basic state machine functionality:
+    - Core state machine elements (states, transitions, parallel, initial)
+    - SCXML-compliant processing model (microstep/macrostep, exit sets, LCCA)
+    - Conditional transitions with expression evaluation
+    - Eventless/automatic transitions (NULL transitions)
+    - Feature detection and test validation infrastructure
+    **Current Test Coverage**: 294/444 tests passing (66.2%)
+    ### Planned Implementation Phases
+    🚧 **Phase 1: Basic Executable Content (2-3 weeks)**
+    **Target**: Unlock 80-100 additional tests (30% improvement)
+    - **`<onentry>` / `<onexit>` actions** - Execute actions during state entry/exit
+    - **`<raise event="name"/>` elements** - Generate internal events
+    - **`<log expr="message"/>` elements** - Debug logging support
+    - **Action execution framework** - Infrastructure for executable content
+    **Expected Outcome**: ~374 tests passing (84% coverage)
+    🚧 **Phase 2: Data Model & Expression Evaluation (4-6 weeks)**
+    **Target**: Unlock 50-70 additional tests (25% improvement)
+    - **`<datamodel>` / `<data>` elements** - Variable storage and initialization
+    - **`<assign location="var" expr="value"/>` elements** - Variable assignment
+    - **JavaScript expression engine** - Full ECMAScript expression support
+    - **Enhanced condition evaluation** - Access to datamodel variables
+    **Expected Outcome**: ~420 tests passing (95% coverage)
+    🚧 **Phase 3: Advanced Features (2-3 weeks)**
+    **Target**: Achieve comprehensive SCXML support (98%+ coverage)
+    - **`<history>` states** - Shallow and deep history state support
+    - **`<send>` elements** - External event sending with delays
+    - **`<script>` elements** - Inline JavaScript execution
+    - **Internal/targetless transitions** - Advanced transition behaviors
+    **Expected Outcome**: ~440+ tests passing (98%+ coverage)
+    ### Implementation Architecture
+    The phased approach maintains backward compatibility while systematically adding SCXML features:
+. **Parser Extensions**: Add executable content parsing to existing SAX-based parser
+. **Interpreter Integration**: Extend microstep/macrostep processing with action execution
+. **Data Model Layer**: Add variable storage and JavaScript expression evaluation
+. **Feature Detection Updates**: Maintain comprehensive feature tracking
+. **Test Coverage Validation**: Ensure each phase improves test coverage without regressions
+    ### Success Metrics
+    - **Phase 1**: 370+ tests passing, all basic executable content working
+    - **Phase 2**: 415+ tests passing, full datamodel and expression support
+    - **Phase 3**: 435+ tests passing, comprehensive SCXML implementation
+    - **Final Goal**: 98%+ test coverage, industry-leading SCXML compliance
+    The implementation plan transforms SC from a basic state machine library into a comprehensive, production-ready SCXML engine with industry-leading test coverage and W3C compliance.
     - Always refer to state machines as state charts
     - Always run 'mix format' after writing an Elixir file.

README.md

            
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                      Diff line number
                      Diff line change
                  
    @@ -60,8 +60,6 @@ An Elixir implementation of SCXML (State Chart XML) state charts with a focus on
  
    ### **✅ SCXML-Compliant Processing Engine**

    **COMPLETED** - Full W3C SCXML specification compliance with proper domain terminology:

    - **`Microstep/Macrostep Execution`** - Implements SCXML event processing model with microstep (single transition set execution) and macrostep (series of microsteps until stable)

    - **`Eventless Transitions`** - Transitions without event attributes (called NULL transitions in SCXML spec) that fire automatically upon state entry

    - **`Exit Set Computation`** - Implements W3C SCXML exit set calculation algorithm for determining which states to exit during transitions

    @@ -73,8 +71,6 @@ An Elixir implementation of SCXML (State Chart XML) state charts with a focus on
  
    ### **✅ Enhanced Parallel State Support**

    **COMPLETED** - Fixed critical regression and enhanced parallel state semantics:

    - **`Cross-Parallel Boundaries`** - Proper exit semantics when transitions leave parallel regions

    - **`Sibling State Management`** - Automatic exit of parallel siblings when transitions exit their shared parent  

    - **`Self-Transitions`** - Transitions within parallel regions preserve unaffected parallel regions

    @@ -83,17 +79,13 @@ An Elixir implementation of SCXML (State Chart XML) state charts with a focus on
  
    ### **✅ Feature-Based Test Validation System**

    **COMPLETED** - Improves test accuracy by validating that tests actually exercise intended SCXML functionality:

    - **`SC.FeatureDetector`** - Analyzes SCXML documents to detect used features

    - **Feature validation** - Tests fail when they depend on unsupported features  

    - **False positive prevention** - No more "passing" tests that silently ignore unsupported features

    - **Capability tracking** - Clear visibility into which SCXML features are supported

    ### **✅ Modular Validator Architecture**

    **COMPLETED** - Refactored monolithic validator into focused, maintainable modules:

    - **`SC.Validator`** - Main orchestrator (from 386-line monolith)

    - **`SC.Validator.StateValidator`** - State ID validation

    - **`SC.Validator.TransitionValidator`** - Transition target validation  

    @@ -103,8 +95,6 @@ An Elixir implementation of SCXML (State Chart XML) state charts with a focus on
  
    ### **✅ Initial State Elements**

    **COMPLETED** - Full W3C-compliant support for `<initial>` elements:

    - **Parser support** - `<initial>` elements with `<transition>` children

    - **Interpreter logic** - Proper initial state entry via initial elements

    - **Comprehensive validation** - Conflict detection, target validation, structure validation

    @@ -116,7 +106,6 @@ The next major areas for development focus on expanding SCXML feature support:
  
    ### **High Priority Features**

    - **Conditional Transitions** - `cond` attribute evaluation for dynamic transitions

    - **Executable Content** - `<onentry>`, `<onexit>`, `<assign>`, `<script>` elements

    - **Datamodel Support** - `<data>` elements with expression evaluation

    - **History States** - Shallow and deep history state support

    @@ -156,10 +145,10 @@ xml = """
  
    </scxml>

    """

    {:ok, document} = SC.Parser.SCXML.parse(xml)

    {:ok, document} = SC.parse(xml)

    # Initialize state chart

    {:ok, state_chart} = SC.Interpreter.initialize(document)

    {:ok, state_chart} = SC.interpret(document)

    # Check active states

    active_states = SC.Interpreter.active_states(state_chart)

    @@ -191,8 +180,8 @@ xml = """
  
    </scxml>

    """

    {:ok, document} = SC.Parser.SCXML.parse(xml)

    {:ok, state_chart} = SC.Interpreter.initialize(document)

    {:ok, document} = SC.parse(xml)

    {:ok, state_chart} = SC.interpret(document)

    # Eventless transitions processed automatically during initialization

    active_states = SC.Interpreter.active_states(state_chart)

    @@ -224,8 +213,8 @@ xml = """
  
    </scxml>

    """

    {:ok, document} = SC.Parser.SCXML.parse(xml)

    {:ok, state_chart} = SC.Interpreter.initialize(document)

    {:ok, document} = SC.parse(xml)

    {:ok, state_chart} = SC.interpret(document)

    # Both parallel regions active simultaneously

    active_states = SC.Interpreter.active_states(state_chart)

    @@ -235,9 +224,9 @@ active_states = SC.Interpreter.active_states(state_chart)
  
    ### Document Validation

    ```elixir

    {:ok, document} = SC.Parser.SCXML.parse(xml)

    {:ok, document} = SC.parse(xml)

    case SC.Validator.validate(document) do

    case SC..validate(document) do

      {:ok, optimized_document, warnings} -> 

        # Document is valid and optimized, warnings are non-fatal

        IO.puts("Valid document with #{length(warnings)} warnings")

    @@ -338,13 +327,13 @@ mix test test/sc/parser/scxml_test.exs
  
    ```elixir

    # 1. Parse: XML → Document structure

    {:ok, document} = SC.Parser.SCXML.parse(xml)

    {:ok, document} = SC.parse(xml)

    # 2. Validate: Check semantics + optimize with lookup maps  

    {:ok, optimized_document, warnings} = SC.Validator.validate(document)

    {:ok, optimized_document, warnings} = SC..validate(document)

    # 3. Interpret: Run state chart with optimized lookups

    {:ok, state_chart} = SC.Interpreter.initialize(optimized_document)

    {:ok, state_chart} = SC.interpret(optimized_document)

    ```

    ## Performance Optimizations

    @@ -362,7 +351,7 @@ The implementation includes several key optimizations for production use:
  
    ```elixir

    # Automatic hierarchical entry

    {:ok, state_chart} = SC.Interpreter.initialize(document)

    {:ok, state_chart} = SC.interpret(document)

    active_states = SC.Interpreter.active_states(state_chart)

    # Returns only leaf states (compound/parallel states entered automatically)

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