GustoLang

A toy language written in kotlin. The original idea was to make a language that was simple to pick up for beginners however I have just been implementing features for fun. The plan right now is to get this targeting the JVM.

Another goal of this project is to try out a few idioms. You may have noticed the build passing tag. Every commit to this project is run through Travis CI and passed through a suite of unit tests. I also just wanted to learn Kotlin.

Road Map

• Desired syntax and semantics

  • Code blocks - Done
  • Variables and assignment - Done
  • Expressions - Done
  • If statements - Done
  • While loops - Done
  • Input and output - Done
  • Function calls - Done
  • Variable types (decimal, character?) - Done
  • Lists - Done
  • Foreach over lists
  • List API to find size, remove first, append lists together etc.
    • Length - Done
    • First
    • Last
    • Remove
    • Append
  • Make lists indexed by strings and other variables as well
  • Allow functions to return nothing. Detect all code paths return the same value. - Started (naive implementation)
  • Static type checking - Done
  • Anonymous functions - Done

• Interpretation

  • jar command line interpreter - Done
  • Javascript interpreter - Done

• Compilation

  • JVM

• Features to consider

  • Target LLVM IR (and as a result all the platforms LLVM targets)
    • Figure out how to work with LLVM garbage collectors
  • Dead variable analysis
  • Unreachable code analysis
  • Constant propagation and expression simplifications
  • Function inlining

Syntax/Grammar

The syntax changes every time I have a cool idea. I keep a formal definition in the file "grammar" however I forget to update this sometimes. I usually keep a working example on my website.