CodeMirror

# Sample mscgen program

# See http://www.mcternan.me.uk/mscgen or

# https://sverweij.github.io/mscgen_js for more samples

msc {

  # options

  hscale="1.2";

​

  # entities/ lifelines

  a [label="Entity A"],

  b [label="Entity B", linecolor="red", arclinecolor="red", textbgcolor="pink"],

  c [label="Entity C"];

​

  # arcs/ messages

  a => c [label="doSomething(args)"];

  b => c [label="doSomething(args)"];

  c >> * [label="everyone asked me", arcskip="1"];

  c =>> c [label="doing something"];

  c -x * [label="report back", arcskip="1"];

  |||;

  --- [label="shows's over, however ..."];

  b => a [label="did you see c doing something?"];

  a -> b [label="nope"];

  b :> a [label="shall we ask again?"];

  a => b [label="naah"];

  ...;

}

​

# Xù - expansions to MscGen to support inline expressions

#      https://github.com/sverweij/mscgen_js/blob/master/wikum/xu.md

# More samples: https://sverweij.github.io/mscgen_js

xu {

  hscale="0.8",

  width="700";

​

  a,

  b [label="change store"],

  c,

  d [label="necro queue"],

  e [label="natalis queue"],

  f;

​

  a =>> b [label="get change list()"];

  a alt f [label="changes found"] { /* alt is a xu specific keyword*/

    b >> a [label="list of changes"];

    a =>> c [label="cull old stuff (list of changes)"];

    b loop e [label="for each change"] { // loop is xu specific as well...

      /*

       * Interesting stuff happens.

       */

      c =>> b [label="get change()"];

      b >> c [label="change"];

      c alt e [label="change too old"] {

        c =>> d [label="queue(change)"];

        --- [label="change newer than latest run"];

        c =>> e [label="queue(change)"];

        --- [label="all other cases"];

        ||| [label="leave well alone"];

      };

    };

​

    c >> a [label="done

    processing"];

​

    /* shucks! nothing found ...*/

    --- [label="nothing found"];

    b >> a [label="nothing"];

    a note a [label="silent exit"];

  };

}

​

# MsGenny - simplified version of MscGen / Xù

#           https://github.com/sverweij/mscgen_js/blob/master/wikum/msgenny.md

# More samples: https://sverweij.github.io/mscgen_js

a -> b   : a -> b  (signal);

a => b   : a => b  (method);

b >> a   : b >> a  (return value);

a =>> b  : a =>> b (callback);

a -x b   : a -x b  (lost);

a :> b   : a :> b  (emphasis);

a .. b   : a .. b  (dotted);

a -- b   : "a -- b straight line";

a note a : a note a\n(note),

b box b  : b box b\n(action);

a rbox a : a rbox a\n(reference),

b abox b : b abox b\n(state/ condition);

|||      : ||| (empty row);

...      : ... (omitted row);

---      : --- (comment);

​