DM - Programming language

DM is a programming language created in 1994.

#832on PLDB

30Years Old

2kRepos

DM is a programming language for the creation of multi-user worlds. By `world' I mean a virtual multi-media environment where people assume personae through which they interact with one another and computer-controlled objects. This could take the form of a competitive game, a role-playing adventure, a discussion board, or something we haven't even imagined.

Tags: programming language
There are at least 2,108 DM repos on GitHub
Early development of DM happened in BYOND Software
The Google BigQuery Public Dataset GitHub snapshot shows 338 users using DM in 394 repos on GitHub
Explore DM snippets on Rosetta Code
GitHub supports syntax highlighting for DM
Read more about DM on the web: 1.

Example from the web:

mob
  verb
     smile()
        world << "[usr] grins."
     giggle()
        world << "[usr] giggles."
     cry()
        world << "[usr] cries \his heart out."

Example from Linguist:

// This is a single line comment.
/*
	This is a multi-line comment
*/

// Pre-processor keywords

#define PI 3.1415

#if PI == 4

#define G 5

#elif PI == 3

#define I 6

#else

#define K 7

#endif


var/GlobalCounter = 0
var/const/CONST_VARIABLE = 2
var/list/MyList = list("anything", 1, new /datum/entity)
var/list/EmptyList[99] // creates a list of 99 null entries
var/list/NullList = null

/*
	Entity Class
*/

/datum/entity
	var/name = "Entity"
	var/number = 0

/datum/entity/proc/myFunction()
	world.log << "Entity has called myFunction"

/datum/entity/New()
	number = GlobalCounter++

/*
	Unit Class, Extends from Entity
*/

/datum/entity/unit
	name = "Unit"

/datum/entity/unit/New()
	..() // calls the parent's proc; equal to super() and base() in other languages
	number = rand(1, 99)

/datum/entity/unit/myFunction()
	world.log << "Unit has overriden and called myFunction"

// Global Function
/proc/ReverseList(var/list/input)
	var/list/output = list()
	for(var/i = input.len; i >= 1; i--) // IMPORTANT: List Arrays count from 1.
		output += input[i] // "+= x" is ".Add(x)"
	return output

// Bitflags
/proc/DoStuff()
	var/bitflag = 0
	bitflag |= 8
	return bitflag

/proc/DoOtherStuff()
	var/bitflag = 65535 // 16 bits is the maximum amount
	bitflag &= ~8
	return bitflag

// Logic
/proc/DoNothing()
	var/pi = PI
	if(pi == 4)
		world.log << "PI is 4"
	else if(pi == CONST_VARIABLE)
		world.log << "PI is [CONST_VARIABLE]!"
	else
		world.log << "PI is approximety [pi]"

#undef PI // Undefine PI

Language features

Feature	Supported	Example	Token
MultiLine Comments	✓	/* A comment */	/* */
Comments	✓	// A comment
Line Comments	✓	// A comment	//
Semantic Indentation	X