Animation State Machine grammar

grammar.js

{
  "parameters":  { "name": <time_value>, ... },
  "clips":       { "name": <clip>, ... },
  "states":      [ "name", ... ],
  "transitions": { "name_from": "name_to", ... },
  "start_state": "name"
}

<time_value> ::=
  <number>                                    // result = number; Constant value.
  "#identity"                                 // result = input; Value that returns its input.
  "#name"                                     // result = name(input); Reference to another value defined in "parameters" block.
  [ "compose" <time_value> <time_value> ]     // result = value1(value2(input)); Value composition.
  [ regex("[+\\-*/mMrRfF]+"), <time_value>* ] // Simple arithmetic operation, see below.
  
<clip> ::=
  "#identity"  // Identity clip, does nothing to the model.
  "#name" // Reference to another clip defined in "clips" block.
  "domain:model#variant@clip" // reference to a clip loaded by the model loader. Variant is optional.
  [ "apply", <clip>, <time_value> ] // clip with input transformed with the specified time value.
  [ "slerp", <clip_from>, <clip_to>, <time_value_input>, <time_value_progress> ] // spherical linear blend between 2 clips; result = (1 - progress) * clip_from(input) + progress * clip_to(input).
  [ "trigger_positive", <clip>, <time_value>, "name" ] // clip that fires an additional event when specified time_value switches from negative to positive.
  
Simple arithmetic operation time value expects 1 time value for each character in the operand string,
and applies operands in order to the input value.

Arithmetic operations:
  "+": output = input + arg;
  "-": output = input - arg;
  "*": output = input * arg;
  "/": output = input / arg;
  "m": output = min(input, arg);
  "M": output = max(input, arg);
  "r": output = floor(input / arg) * arg;
  "R": output = ceil(input / arg) * arg;
  "f": output = input - floor(input / arg) * arg;
  "F": output = ceil(input / arg) * arg - input;