The FML Data Serialization Language

FML is a data serialization language. It allows to manipulate data in several types.

Specification

• Comments: FML allows one-line comments. Comments start with a hash symbol (#). E.g. # This is a comment.
• Keys: keys can be started with an underscore (_) or letter, followed by numbers, lower or upper case letters, and/or underscores.
• Values:
  • Strings: strings must be in double-quotes. E.g. "this is a string".
  • Chars: chars must be in quotes. E.g. 'c'.
  • Integers¹: e.g. 255.
  • Float¹: e.g. floats can be write 255., 255.0 or 255f.
  • Array: arrays must be curly between braces ({ }) separated by comma (,). E.g. {0, 1, 2}, {'a', 'b', 'c'}, {{0, 1}, {0, 1}} and so on.

¹ Some types must be parsed as maximum language precision for that type.

File in FML Notation

# All data types of a FML file.

# Literals
string:"string \"between\" double quotes";
char:'c';
quote_in_char:'\'';

# Numerics
int:10;
float:0.5;

# Booleans
boolTrue:true;
boolFalse:false;

# Vector
stringArr:{"yes", "no", "maybe"};
chargArr:{'a', 'b', 'c'};
intArr:{0, 1, 2, 10, -5};
floatArr:{0.9, 1.7, -0.2, 1.06, -5.618};
boolArr:{true, false, true};

# Matrix
multArr2:{
  {0, 1, 2},
  {0, 1, 2},
  {0, 1, 2}
};

# Multidimensional array
multArr3:{
  {
    {0, 1, 2},
    {0, 1, 2},
    {0, 1, 2}
  },
  {
    {0, 1, 2},
    {0, 1, 2},
    {0, 1, 2}
  },
  {
    {0, 1, 2},
    {0, 1, 2},
    {0, 1, 2}
  }
};

# Sub-structures
sub_str:
  v1: 10;
  v2: "sub";
;

# Array of sub-structures
stringArr:{
  sub_str:
    v1:10;
    v2:"sub";
  ;,
  sub_str:
    v1:11;
    v2:"sup";
  ;,
  sub_str:
    v1:20;
    v2:"sut";
  ;
};