tests/examplefiles/example.u

 // This is a one line comment.
  /* an inner comment */

 /* nested /* comments */ */

  /*
    /*
       Multi-line.
    */
  */

// Binary blob escape.
//"some text \B(3)("\") ouhyeah" == "\"\\\"";
"some text \B(3)("\") ouhyeah" == "\"\\\"";
'some text \B(3)('\') ouhyeah' == '\'\\\'';

//"\B(4)()"'()";
"\B(4)()"'()";
'\B(4)()'"()';

//blob size limits
"hey ! \B(0)() oh !"

//blob format is wrong
"hey ! \B(2)(aaa) oh !"
"hey ! \B(100)(aaa) oh !"

//multiple blob in a string
"hey ! \B(3)(aaa) hey ! \B(3)(aaa) oh !"

// multiple digits blob size
"hey ! \B(10)(aaaaaaaaaa)  !"
"hey ! \B(10)(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)  !"
"hey ! \B(100)(a)  !"

// multiple digits blob size
"hey ! \B(007)(aaaaaaa)  !"
"hey ! \B(007)(aa)  !"
"hey ! \B(007)(aaaaaaaaaaaaaaaaaa)  !"

// deprecated and restricted keyworks
emit Event.new;
static int main();

loopn (2) {echo("a");};

foreach (var i : [1,2,3,4]) {
	echo(i);
};

function() {};

var 'if';
var this.'else';

var '%x';
var '1 2 3';
var this.'[]';

// angles
pi == 180deg;
pi == 200grad;

// Dictionary
[ => ]; // The empty dictionary

// duration
1d   == 24h;
0.5d == 12h;
1h   == 60min;
1min == 60s;
1s   == 1000ms;

1s == 1;
1s 2s 3s == 6;
1s 1ms == 1.001;
1ms 1s == 1.001;


            1 == 1;
            1 == 1.0;
          1.2 == 1.2000;
      1.234e6 == 1234000;
        1e+11 == 1E+11;
         1e10 == 10000000000;
         1e30 == 1e10 * 1e10 * 1e10;


0.000001;

0.0000001;

0.00000000001;

1e+3;

1E-5;


1.;
// [00004701:error] !!! syntax error: unexpected ;

      0x2a == 42;
      0x2A == 42;
  0xabcdef == 11259375;
  0xABCDEF == 11259375;
0xFFFFFFFF == 4294967295;


//123foo;
//[00005658:error] !!! syntax error: invalid token: '123foo'
//12.3foo;
//[00018827:error] !!! syntax error: invalid token: '12.3foo'
0xabcdef;
//[00060432] 11259375
//0xabcdefg;
//[00061848:error] !!! syntax error: invalid token: '0xabcdefg'


[]; // The empty list
[1, 2, 3];

// Special characters.
"\"" == "\"";
"\\" == "\\";

// ASCII characters.
"\a" == "\007"; "\a" == "\x07";
"\b" == "\010"; "\b" == "\x08";
"\f" == "\014"; "\f" == "\x0c";
"\n" == "\012"; "\n" == "\x0a";
"\r" == "\015"; "\r" == "\x0d";
"\t" == "\011"; "\t" == "\x09";
"\v" == "\013"; "\v" == "\x0b";

// Octal escapes.
"\0" == "\00"; "\0" == "\000";
"\0000" == "\0""0";
"\062\063" == "23";

// Hexadecimal escapes.
"\x00" == "\0";
"\x32\x33" == "23";


"foo" "bar" "baz" == "foobarbaz";

// Tuples
();
[00000000] ()
(1,);
[00000000] (1,)
(1, 2);
[00000000] (1, 2)
(1, 2, 3, 4,);
[00000000] (1, 2, 3, 4)

function Global.verboseId(var x)
{
  echo(x) | x
}|;
class verboseId(Global).math : verboseId(Math)
{
};

{
  for (3)
  {
    sleep(1s);
    echo("ping");
  },
  sleep(0.5s);
  for (3)
  {
    sleep(1s);
    echo("pong");
  },
};

       1 + 1 ==    2;
       1 - 2 ==   -1;
       2 * 3 ==    6;
      10 / 2 ==    5;
     2 ** 10 == 1024;
    -(1 + 2) ==   -3;
   1 + 2 * 3 ==    7;
 (1 + 2) * 3 ==    9;
     -2 ** 2 ==   -4;
   - - - - 1 ==    1;

a = b
a += b
a -= b
a *= b
a /= b
a %= b
a ^= b


var value = 0|;
var valueAlias = value|;
value += 10;
valueAlias;
var myList = []|;
var myList.specialFeature = 42|;
myList += [1, 2, 3];
myList.specialFeature;
var myOtherList = myList + [4, 5];
myOtherList.specialFeature;
var something = []|;
var somethingElse = something|;
something += [1, 2];
somethingElse += [3, 4];
something;


class Counter
{
  var count = 0;
  function init (n)   { var this.count = n };
  // Display the value, and the identity.
  function asString() { "%s @ %s" % [count, uid ] };
  function '+'(var n) { new(count + n) };
  function '-'(var n) { new(count - n) };
}|;


class ImmutableCounter : Counter
{
  function '+='(var n) { this + n };
  function '-='(var n) { this - n };
}|;

var ic1 = ImmutableCounter.new(0);
var ic2 = ic1;

ic1 += 1;
ic1;
ic2;


a << b
a >> b
a ^ b

4 << 2 == 16;
4 >> 2 ==  1;

!a
a && b
a || b

true && true;
true || false;
!true == false;
true || (1 / 0);
(false && (1 / 0)) == false;

a == b
a != b
a === b
a !== b
a ~= b
a =~= b
a < b
a <= b
a > b
a >= b

assert{
 ! (0 < 0);
    0 <= 0;
    0 == 0;
   0 !== 0;
};

a in b
a not in b
a[args]
a[args] = v

1     in [0, 1, 2];
3 not in [0, 1, 2];

"one"   in     ["zero" => 0, "one" => 1, "two" => 2];
"three" not in ["zero" => 0, "one" => 1, "two" => 2];

a.b
a.b(args)
a->b
a->b = v
a.&b

var obj = Object.new|;
function obj.f() { 24 }|;


var f = function(a, b) {
  echo(b + a);
}|
f(1, 0);


function g3()
{
  return; // Stop execution at this point and return void
  echo(0); // This is not executed
}|

Object.setProperty, to define/set a property.
Object.getProperty, to get a property.
Object.removeProperty, to delete a property.
Object.hasProperty, to test for the existence of a property.
Object.properties, to get all the properties of a slot.

enum Suit
{
  hearts,
  diamonds,
  clubs,
  spades, // Last comma is optional
};

for (var suit in Suit)
  echo("%s the ace of %s." % [find_ace(suit), suit]);

switch ( ("foo", [1, 2]) )
{
  // The pattern does not match the values of the list.
  case ("foo", [2, 1]):
    echo("fail");

  // The pattern does not match the tuple.
  case ["foo", [1, 2]]:
    echo("fail");

  // The pattern matches and binds the variable "l"
  // but the condition is not verified.
  case ("foo", var l) if l.size == 0:
    echo("fail");

  // The pattern matches.
  case ("foo", [var a, var b]):
    echo("foo(%s, %s)" % [a, b]);
};
//[00000000] *** foo(1, 2)

{
  ["b" => var b, "a" => var a] = ["a" => 1, "b" => 2, "c" => 3];
  echo("a = %d, b = %d" % [a, b]);
};
//[00000000] *** a = 1, b = 2


switch (["speed" => 2, "time" => 6s])
{
  case ["speed" => var s] if s > 3:
    echo("Too fast");
  case ["speed" => var s, "time" => var t] if s * t > 10:
    echo("Too far");
};
//[00000000] *** Too far


try
{
  throw ("message", 0)
}
catch (var e if e.isA(Exception))
{
  echo(e.message)
}
catch ((var msg, var value) if value.isA(Float))
{
  echo("%s: %d" % [msg, value])
};
//[00000000] *** message: 0


{
  var e = Event.new;
  at (e?(var msg, var value) if value % 2 == 0)
    echo("%s: %d" % [msg, value]);

  // Does not trigger the "at" because the guard is not verified.
  e!("message", 1);

  // Trigger the "at".
  e!("message", 2);
};
//[00000000] *** message: 2

for (var i = 0; i < 8; i++)
{
  if (i % 2 != 0)
    continue;
  echo(i);
};

do (1024)
{
  assert(this == 1024);
  assert(sqrt == 32);
  setSlot("y", 23);
}.y;

{
  var n = 10|;
  var res = []|;
  loop;{
    n--;
    res << n;
    if (n == 0)
      break
  };
  res
}


{
  var n = 10|;
  var res = []|;
  loop|{
    n--;
    res << n;
    if (n == 0)
      break
  };
  res
}


var j = 3|
while (0 < j)
{
  echo(j);
  j--;
};


{
  var i = 4|
  while| (true)
  {
    i -= 1;
    echo ("in: " + i);
    if (i == 1)
      break
    else if (i == 2)
      continue;
    echo ("out: " + i);
  };
};


function test(e)
{
  try
  { throw e;  }
  catch (0)
  { echo("zero") }
  catch ([var x, var y])
  { echo(x + y) }
} | {};

try   { echo("try") }
catch { echo("catch")}
else  { echo("else")};


try
{
  echo("inside");
}
finally
{
  echo("finally");
};
//[00000001] *** inside
//[00000002] *** finally

at (e?(var start) ~ 1s)
  echo("in : %s" % (time - start).round)
onleave
  echo("out: %s" % (time - start).round);

// This emission is too short to trigger the at.
e!(time);

// This one is long enough.
// The body triggers 1s after the emission started.
e!(time) ~ 2s;
//[00001000] *** in : 1
//[00002000] *** out: 2


timeout (2.1s)
  every (1s)
    echo("Are you still there?");
//[00000000] *** Are you still there?
//[00001000] *** Are you still there?
//[00002000] *** Are you still there?

  every| (1s)
  {
    echo("aba");
  };

for, (var i = 3; 0 < i; i -= 1)
{
  echo (i);
};


for& (var i: [0, 1, 2])
{
  echo (i * i);
};

loop,{
};


waituntil (e?(1, var b));

whenever (e?("arg", var arg) if arg % 2)
  echo("e (%s) on" % arg)
else
  echo("e off");


  while, (i)
  {
    var j = i -= 1;
  }|


var y = 0;
{
  sleep(0.5s);
  y = 100 smooth:3s,
},