Add Java Language support to LSH

[sarweshwaran-rs]

Add Java syntax highlighting definition

Summary

Adds Java syntax highlighting support to the Lightweight Syntax Highlighter (LSH).

Changes

New Java Language Definition

Added a new syntax definition:

crates/lsh/definitions/java.lsh

The Java definition provides highlighting for:

• comments
• string literals
• text blocks (""")
• character literals
• annotations
• control-flow keywords
• language keywords
• primitive types
• class declarations
• interface declarations
• enum declarations
• record declarations
• constructors
• method declarations
• method calls
• generic types
• constants
• object construction via new
• language literals (true, false, null)
• this and super

Editor Integration

Added color mappings for:

• HighlightKind::Type
• HighlightKind::StorageAnnotation
• HighlightKind::StorageType

in:

crates/edit/src/buffer/mod.rs

This ensures the new Java syntax definition is rendered with appropriate colors.

Testing

Tested using Java source files containing:

• classes
• interfaces
• enums
• records
• annotations
• generic collections
• constructors
• method declarations
• method invocations
• text blocks
• comments
• control-flow constructs
• exception handling

Examples tested include:

public class Main { }
interface Shape { }
enum Color { RED, GREEN, BLUE }
record User(String name, int age) { }

List<String> names = new ArrayList<>();

@Override
public String toString() {
    return "Main";
}

The editor successfully recognizes and highlights Java source files (*.java) using the new LSH definition.

Screenshots

The attached screenshots demonstrate highlighting of:

• annotations
• comments
• strings and text blocks
• primitive types
• generics
• class/interface/enum/record declarations
• constructors
• method declarations and calls
• constants
• control-flow constructs
• exception handling

Screenshot 1

Screenshot 2

Screenshot 3

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