Monkey Lang

Currently extending the Monkey programming language designed in Writing An Interpreter In Go and Writing a Compiler in Go by Thorsten Ball. I highly recommend picking up a copy of his books.

I'll formally document the language and it's features at some point, but for now I'm keeping a list of the additional functionality I've added on top of original design.

All additional features (where applicable) have been implemented for both the interpreter and the compiler:

1. Ability to execute Monkey files (.mo file ext) in addition to the interactive console. This is now the default behavior. Add --console flag when executing to drop into the REPL instead.
2. Both file execution and console usage respond to an --engine= flag where you can choose to use the evaluator or the VM.
3. Logical operators && and ||
4. Single line comments starting with //
5. Multi line comments using /* */
6. const variable declaration (although it only mocks let at this point until I add variable reassignment)
7. Modulo operator %
8. Postfix operators ++ and --
9. Comparison operators >= and <=
10. String comparisons using != and ==
11. Line numbers throughout the tokens/lexer/parsing/evaluator used for better errors.
12. Ability to have question marks in identifiers. Ex: has_attribute?
13. Additional builtin functions:

    Type	Builtin
    Array	pop, join
    String	split

14. VS Code syntax highlighting extension. Not yet published, but working and provides basic syntax highlighting.
15. Add installation support through brew
16. Add roughly +20% code coverage

Installation

Option A:

brew tap bradford-hamilton/monkey
brew install bradford-hamilton/monkey/monkey

Option B:

If you mosey on over to releases, you'll find binaries for darwin, linux, windows, and amd64. You can download directly from there.

Option C:

If you have Go installed on your machine, use go install:

go install github.com/bradford-hamilton/monkey-lang

This will place the binary in your go/bin and is ready to use.

Usage

Build

go build -o monkey main.go

Run

./monkey [option...] filePath

Examples

Running with vm

./monkey --engine=vm examples/program.mo

Running with evaluator

./monkey --engine=eval examples/program.mo

Run interactive console

./monkey --console

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