# Coding conventions

How to style your C and Ruby code which you want to submit.

## C code

The core part (parser, bytecode-interpreter, core-lib, etc.) of mruby is
written in the C programming language. Please note the following hints for your
C code:

### Comply with C99 (ISO/IEC 9899:1999)

mruby should be highly portable to other systems and compilers. For that it is
recommended to keep your code as close as possible to the C99 standard
(http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf).

Although we target C99, VC is also an important target for mruby, so that we
avoid local variable declaration in the middle.

### Reduce library dependencies to a minimum

The dependencies to libraries should be put to an absolute minimum. This
increases the portability but makes it also easier to cut away parts of mruby
on-demand.

### Don't use C++ style comments

    /* This is the prefered comment style */

Use C++ style comments only for temporary comment e.g. commenting out some code lines.

### Insert a break after the method return value:

    int
    main(void)
    {
      ...
    }

## Ruby code

Parts of the standard library of mruby is written in the Ruby programming language
itself. Please note the following hints for your Ruby code:

### Comply with the Ruby standard (ISO/IEC 30170:2012)

mruby is currently targeting to execute Ruby code which complies to ISO/IEC
30170:2012 (http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=59579).