mruby

mruby

Developer(s)	Yukihiro Matsumoto et al.
Initial release	April 20, 2012; 9 years ago (2012-04-20)
Stable release	3.0.0 / March 5, 2021; 9 months ago (2021-03-05)[1]
Repository	github.com/mruby/mruby
Written in	C and Ruby
Operating system	Cross-platform
Standard(s)	ISO/IEC 30170:2012
Type	Ruby programming language interpreter
License	MIT License[2]
Website	mruby.org

mruby is an interpreter for the Ruby programming language with the intention of being lightweight and easily embeddable.^[3][4] The project is headed by Yukihiro Matsumoto, with over 100 contributors currently working on the project.

Features[]

mruby 1.0 supports the Ruby 2.1 core API, but none of the standard library. As well as being able to execute most basic Ruby code, mruby also features a bytecode compiler and virtual machine, as well as the ability to be easily embedded and integrated into C or C++ code, in a similar manner to Lua or Tcl.

mruby 2.0.0^[5] adds support for several Ruby 2.x methods beyond Ruby 2.1. v2.0.0 also changed to variable length bytecode instructions format.

mruby bytecode can be embedded in C code, and thus, can be compiled into a standalone executable.^[6]

mruby also aims^[3] to be compliant with the ISO/IEC 30170:2012 standard.^[7]

Examples[]

Calling mruby from C[]

#include <stdio.h>
#include <mruby.h>
#include <mruby/compile.h>

int main(void) {
    mrb_state *mrb = mrb_open();
    char code[] = "5.times { puts 'mruby is awesome!' }";

    printf("Executing Ruby code with mruby:\n");
    mrb_load_string(mrb, code);

    mrb_close(mrb);
    return 0;
}

Assuming that you have mruby installed and in your path, the following program can be compiled and executed by running the following command from your terminal:^[8]

$ cc example.c -lmruby -lm -o example
$ ./example

Precompiled Bytecode[]

mruby includes a minimalistic virtual machine used to execute mruby bytecode, nicknamed ritevm:

$ mrbc test.rb
$ mruby -b test.mrb

The first command compiles Ruby code to mruby bytecode, creating a file called "test.mrb", which can then be executed by appending the "-b" flag to the normal interpreter arguments.^[9]

References[]

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