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Monyet

Crystal implementation of the Monkey Language

Monyet has a sibling implementation for Kotlin: monkey.kt

Status

The two books (Writing An Interpreter In Go and Writing A Compiler in Go) are implemented.

Commands

Before running the command you must have crystal and shards installed on your machine

Script Description
tests.sh Run all the tests
checks.sh Run format tool and ameba checks
build.sh Release build
benchmarks.sh Run the classic monkey benchmark (fibonacci(35)), requires one command (--eval,--eval-fast,--vm,--vm-fast)
repl.sh Run the Monyet REPL

Compiling variants

There are two different implementations for the compiler/VM.

  • The default variant, based on Array(UInt8) as Bytecode and OffsetArray arrays for read operations
  • The slices variant, based purely on Slice(UInt8)

The slices variant is more idiomatic but the default variant has better performance (around 10%).

To compile with a different variant you can the flag --define=slice to your compile or test. Additionally, both build.sh and test.sh have lines that you can comment/uncomment to enable different variants

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An implementation of the monkey language on Crystal

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