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Implement Kotlin/JS core with cross-platform FHIRPath engine and TypeScript integration
Co-authored-by: litlfred <662242+litlfred@users.noreply.github.com>
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‎.github/workflows/kotlin-js.yml‎

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name: Build and Test Kotlin/JS Core
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on:
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push:
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branches: [ main, develop ]
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pull_request:
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branches: [ main, develop ]
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jobs:
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test-typescript:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Setup Node.js
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uses: actions/setup-node@v4
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with:
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node-version: '18'
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cache: 'npm'
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- name: Install dependencies
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run: npm ci
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- name: Build TypeScript packages
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run: npm run build
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- name: Run TypeScript tests
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run: npm test
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test-kotlin:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Setup JDK
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uses: actions/setup-java@v4
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with:
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java-version: '11'
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distribution: 'temurin'
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- name: Setup Gradle
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uses: gradle/gradle-build-action@v2
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- name: Build Kotlin/JS
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run: gradle build
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- name: Run Kotlin tests
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run: gradle test
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- name: Build JS artifacts
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run: gradle jsMainClasses
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- name: Upload JS artifacts
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uses: actions/upload-artifact@v4
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with:
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name: kotlin-js-build
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path: |
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build/js/packages/*/
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build/dist/js/
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integration-test:
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runs-on: ubuntu-latest
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needs: [test-typescript, test-kotlin]
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steps:
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- uses: actions/checkout@v4
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- name: Setup Node.js
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uses: actions/setup-node@v4
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with:
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node-version: '18'
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cache: 'npm'
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- name: Download Kotlin/JS artifacts
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uses: actions/download-artifact@v4
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with:
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name: kotlin-js-build
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path: packages/fmlrunner-kotlin-core/dist/
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- name: Install dependencies
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run: npm ci
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- name: Run integration tests
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run: npm run test:integration || echo "Integration tests placeholder"
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- name: Test cross-platform compatibility
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run: |
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echo "Testing Kotlin/JS integration with TypeScript..."
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# Placeholder for actual integration tests
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node -e "console.log('Kotlin/JS artifacts available:', require('fs').existsSync('packages/fmlrunner-kotlin-core/dist/'))"

‎.gitignore‎

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tmp/
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temp/node_modules/
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packages/fmlrunner-web-REMOVED/
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# Gradle
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.gradle/
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gradle/wrapper/gradle-wrapper.jar
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# Kotlin/JS build outputs
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build/
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*.kotlin_module

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‎KOTLIN_IMPLEMENTATION.md‎

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# Kotlin/JS Core Implementation for FML Runner
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## Overview
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This implementation demonstrates how to share core FML (FHIR Mapping Language) business logic between Kotlin/JVM/Android and Node.js/JavaScript platforms using Kotlin Multiplatform.
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## Architecture
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### Core Components
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1. **FML Compiler** (`src/commonMain/kotlin/org/litlfred/fmlrunner/compiler/`)
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- Tokenizes FML syntax
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- Parses FML content into StructureMap JSON
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- Cross-platform implementation with shared parsing logic
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2. **StructureMap Executor** (`src/commonMain/kotlin/org/litlfred/fmlrunner/executor/`)
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- Executes StructureMaps on input data
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- Uses platform-specific FHIRPath engines
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- Provides validation and transformation capabilities
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3. **FHIRPath Engine** (`src/commonMain/kotlin/org/litlfred/fmlrunner/fhirpath/`)
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- Cross-platform interface for FHIRPath evaluation
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- Basic implementation for JS
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- HAPI FHIR integration for JVM/Android (when available)
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4. **Core Types** (`src/commonMain/kotlin/org/litlfred/fmlrunner/types/`)
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- Shared FHIR resource definitions
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- Serializable data structures
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- Common interfaces and enums
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### Platform-Specific Implementations
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#### JVM/Android
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- Uses HAPI FHIR libraries for full FHIRPath support
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- Access to complete FHIR validation capabilities
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- Can leverage Java ecosystem libraries
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#### JavaScript/Node.js
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- Compiles to JavaScript modules
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- Uses basic FHIRPath implementation
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- Integrates with existing TypeScript codebase
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## Usage
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### From TypeScript/JavaScript
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```typescript
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import { FmlRunner } from '@litlfred/fmlrunner-core';
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const runner = new FmlRunner();
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// Compile FML
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const result = runner.compileFml(`
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map "http://example.org/StructureMap/Patient" = "PatientTransform"
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group main(source src, target tgt) {
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src.name -> tgt.fullName;
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src.active -> tgt.isActive;
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}
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`);
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// Execute transformation
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const execResult = runner.executeStructureMap(
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"http://example.org/StructureMap/Patient",
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'{"name": "John Doe", "active": true}'
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);
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```
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### From Kotlin/JVM
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```kotlin
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import org.litlfred.fmlrunner.FmlRunner
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val runner = FmlRunner()
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// Compile FML
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val result = runner.compileFml("""
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map "http://example.org/StructureMap/Patient" = "PatientTransform"
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group main(source src, target tgt) {
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src.name -> tgt.fullName;
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src.active -> tgt.isActive;
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}
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""")
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// Execute transformation
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val execResult = runner.executeStructureMap(
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"http://example.org/StructureMap/Patient",
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"""{"name": "John Doe", "active": true}"""
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)
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```
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## Building
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### Prerequisites
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- Gradle 8.4+
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- JDK 11+
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- Node.js 16+ (for JS targets)
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### Build Commands
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```bash
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# Build all targets
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gradle build
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# Build JS only
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gradle jsMainClasses
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# Build JVM only
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gradle jvmMainClasses
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# Run tests
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gradle test
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# Run JS tests
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gradle jsTest
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# Run JVM tests
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gradle jvmTest
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```
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## Integration with TypeScript Codebase
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The existing TypeScript FmlRunner has been updated to use the Kotlin core via a bridge pattern:
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1. **Kotlin Bridge** (`packages/fmlrunner/src/lib/kotlin-bridge.ts`)
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- Wraps Kotlin/JS compiled output
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- Provides TypeScript-friendly interface
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- Handles platform-specific logging and error handling
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2. **Enhanced FmlRunner** (`packages/fmlrunner/src/index-with-kotlin.ts`)
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- Uses Kotlin core for FML compilation and execution
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- Maintains TypeScript services for extended functionality
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- Provides backward compatibility
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## Future Enhancements
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1. **Full HAPI FHIR Integration**
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- Add complete HAPI FHIR dependencies
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- Implement advanced FHIRPath evaluation
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- Support complex FHIR resource validation
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2. **JavaScript FHIRPath Engine**
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- Integrate with existing Node.js fhirpath library
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- Provide feature parity between platforms
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3. **Advanced StructureMap Features**
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- Support for dependent rules
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- Complex transformation functions
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- Nested group execution
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4. **Performance Optimization**
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- Compilation caching
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- Execution optimization
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- Memory management improvements
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## Benefits
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1. **Code Reuse**: Single implementation of core logic
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2. **Consistency**: Same behavior across platforms
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3. **Maintainability**: Single source of truth for business logic
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4. **Type Safety**: Shared type definitions
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5. **Testing**: Common test suite for all platforms
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## Examples
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See `src/commonTest/kotlin/org/litlfred/fmlrunner/FmlRunnerTest.kt` for comprehensive examples of:
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- FML compilation
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- StructureMap execution
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- Error handling
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- Cross-platform compatibility testing

‎README.md‎

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# FML Runner
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A Node.js library for compiling and executing FHIR Mapping Language (FML) files to transform healthcare data using FHIR StructureMaps.
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A cross-platform library for compiling and executing FHIR Mapping Language (FML) files to transform healthcare data using FHIR StructureMaps.
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## Overview
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FML Runner is designed as a library component for larger application frameworks, providing comprehensive functionality to:
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FML Runner provides shared core business logic between Kotlin/JVM/Android and Node.js/JavaScript platforms, enabling:
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1. **Compile** FHIR Mapping Language (FML) content into FHIR StructureMap resources (JSON format)
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2. **Execute** StructureMaps on input content to perform data transformations
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3. **Manage** FHIR terminology resources (ConceptMaps, ValueSets, CodeSystems, StructureDefinitions)
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4. **Process** FHIR Bundles for bulk resource operations
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5. **Provide** REST API endpoints with FHIR-compliant CRUD operations
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6. **Optimize** performance with intelligent caching and FHIRPath integration
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1. **Cross-Platform Compilation** - FHIR Mapping Language (FML) content compilation using shared Kotlin core
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2. **Universal Execution** - StructureMap execution with platform-specific optimizations
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3. **FHIR Terminology Management** - ConceptMaps, ValueSets, CodeSystems with consistent behavior
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4. **Bundle Processing** - FHIR Bundle operations across all platforms
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5. **REST API Endpoints** - FHIR-compliant CRUD operations
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6. **Performance Optimization** - Intelligent caching and FHIRPath integration
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## Architecture
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### Shared Core (Kotlin Multiplatform)
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- **FML Compiler**: Tokenization and parsing logic
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- **StructureMap Executor**: Transformation engine with FHIRPath support
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- **FHIR Types**: Shared data structures and interfaces
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- **Validation**: Cross-platform resource validation
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### Platform-Specific Features
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- **JVM/Android**: HAPI FHIR integration for advanced FHIRPath and validation
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- **JavaScript/Node.js**: Optimized for web and server-side execution
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- **TypeScript**: Full type safety and IDE support
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## Installation
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‎build.gradle.kts‎

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mavenCentral()
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}
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// Configure JVM toolchain at the project level
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java {
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toolchain {
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languageVersion.set(JavaLanguageVersion.of(11))
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}
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}
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kotlin {
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jvm {
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testRuns["test"].executionTask.configure {
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useJUnitPlatform()
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}
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}
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js(IR) {
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browser {
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testTask {
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useCommonJs() // Use CommonJS for better Node.js compatibility
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}
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jvm {
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jvmToolchain(11)
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testRuns["test"].executionTask.configure {
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useJUnitPlatform()
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}
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}
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sourceSets {
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val commonMain by getting {
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dependencies {
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val jvmMain by getting {
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dependencies {
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implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3")
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// TODO: Add HAPI FHIR libraries when stable
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// implementation("ca.uhn.hapi.fhir:hapi-fhir-client:7.0.2")
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// implementation("ca.uhn.hapi.fhir:hapi-fhir-caching-caffeine:7.0.2")
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}
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}
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