Simple UI Script

A small, extendable interpreter for a minimalist scripting language implemented in Kotlin using the better-parse library.

Features

• Variables: var name = expression
• Data Types: Integer, String, Boolean
• Expressions:
  • Arithmetic: +, -, *, /
  • Comparison: ==, !=, <, >, <=, >=
  • Logical: &&, ||, unary !, unary +, unary -
• Control Flow:
  • if (condition) { ... } else { ... }
  • while (condition) { ... }
• Function Calls: built-in submit() and showAlert(message) for side effects
• AST-based: clear separation between parsing and evaluation

Getting Started

Prerequisites

• JDK 8+ or later
• Gradle or Maven

Build

Using Gradle:

./gradlew build

Using Maven:

mvn clean package

Run Examples

You can run it from your IDE or via a main launcher, for example:

# If you have an application plugin set up in Gradle:
./gradlew run

Extending the Interpreter

This minimal interpreter can be extended with:

• Loops: for, do-while
• Functions: user-defined functions, parameters, return
• Scope Management: local vs. global variables
• Data Structures: Lists, Maps, Arrays
• Error Handling: richer error messages, exception handling (throw/catch)
• Standard Library: print(), toString(), math utilities

To add new grammar rules, update Parser.kt and extend Interpreter.evaluateExpression or executeStatement accordingly.

Contributing

Feel free to open issues or submit pull requests to add features or fix bugs. Please follow the existing code style and add tests for new functionality.

License

This project is released under the GPL3 License.