Language Module

The language module provides core PMD integration for Scala support, registering the language with PMD's framework and providing version-specific configuration.

Core Language Integration

ScalaLanguageModule

Main language module registration class that integrates Scala with PMD's multilanguage architecture.

public class ScalaLanguageModule extends SimpleLanguageModuleBase {
    public ScalaLanguageModule();
    public static ScalaLanguageModule getInstance();
    public CpdLexer createCpdLexer(LanguagePropertyBundle bundle);
}

Usage Example:

// Get the singleton Scala language module instance
ScalaLanguageModule module = ScalaLanguageModule.getInstance();

// Create a CPD lexer for copy-paste detection
LanguagePropertyBundle bundle = // ... configure language properties
CpdLexer lexer = module.createCpdLexer(bundle);

ScalaLanguageHandler

Language version handler that provides parser instances for different Scala versions.

public class ScalaLanguageHandler extends AbstractPmdLanguageVersionHandler {
    public ScalaParser getParser();
}

Usage Example:

ScalaLanguageHandler handler = new ScalaLanguageHandler();
ScalaParser parser = handler.getParser();

Supported Versions

The module supports the following Scala versions through dialect configuration:

• Scala 2.10: Historical support
• Scala 2.11: Historical support
• Scala 2.12: Primary target version for this module
• Scala 2.13: Default version used when no specific version is specified

Integration Points

PMD Framework Integration

The language module integrates with PMD through:

1. Language Registry: Registers "scala" as a supported language
2. File Extensions: Associates ".scala" files with the Scala language module
3. Version Management: Provides version-specific parsing capabilities
4. CPD Integration: Creates lexers for copy-paste detection

Configuration

Language configuration is handled through:

// Language metadata configuration
LanguageMetadata.withId("scala")
    .name("Scala")
    .extensions("scala")
    .addVersion("2.10")
    .addVersion("2.11") 
    .addVersion("2.12")
    .addDefaultVersion("2.13")

The module automatically configures:

• Language identifier: "scala"
• Display name: "Scala"
• File extensions: ".scala"
• Supported versions with 2.13 as default