Adhoc Language¶

Note

This page is taken from GTAdhocToolchain's wiki.

Assume we are starting from Javascript/Python, which is the closest to adhoc.

Most of the syntax has been figured out from (in order of advancements):

Adhoc bytecode itself, which is pretty verbose
GTS Closed Beta, which had some leftover tinyweb scripts in source form
GT Sport scripts, which had various asserts, by that point most of the language was figured out
GT7, which has an adhoc compiler (albeit without its accompanying preprocessor), which helped figure out most if not all of the rest of the language such as list assignments. Notes here.

Basic Things¶

Things you would expect but will mention just to be sure, the following trivial statements/expressions are allowed:

Variables, only with the var keyword
Bool literals
Number literals (hex, binary, octal also supported, essentially the majority of the the javascript spec)
if/else if/else statements
Loop statements (for, while, do ... while) with continue or break
Switch statements (with case/default)
Arrays with []
Binary operators (+, -, /, %, *) and ** (pow)
Bitwise operators (^, &, |, >>, <<, etc)
Unary operators (!, ~, -, +, ++<variable>, <variable>++, <variable>--, --<variable>)
Logical operators (||, &&)
Strings, essentially the majority of the javascript spec

Nulls: `null` = `nil`¶

Every dereferenced value is a nil, instead of a null.

So always check for nil.

if (myVariable == nil)
    return;

Modules, Classes, Attributes and Statics¶

Modules & Statics¶

Modules have a completely different meaning in Adhoc. Think of them as C++ namespaces, they can be navigated to.

Classes also exist, and are used to define types that inherit from a base adhoc object.

Either of them supports functions and methods.

Methods are members of a class and requires an instance to be called. Functions are static.

module MyModule
{
   function myFunction() { ... }
   method myMethod() { ... } // Note the keyword 'method'
}

For static variables, the keyword static is used. They are accessed in a C++ namespace manner, or through [] indexing:

module StaticModule
{
  static PI = 3.14;
}

// Access static field
var pi = StaticModule::PI;

// Access a static field by name
var pi = StaticModule["PI"];

// Navigating through engine modules to call a function
pdistd::MPjson::Encode(/* ... */);

If you need to use something from the global modules/top-level and ignore current module scope, you can use the :: operator prefix (similar to C++'s scope resolution operator):

static x = 1;

function test_func()
{
    var x = 2;
    print ::x; // would print 1
}

Attributes¶

Properties are called attributes in adhoc. They are defined with the attribute keyword, just like how you would declare a var or static.

Without value: attribute myAttribute - Will be defaulted to nil
With value: attribute myAttribute = []

Note

Attributes with values are only supported in Adhoc Version 7 and above.

class Dog
{
   attribute name;
}

Attributes can also be defined in modules.

Class Constructors¶

Class constructors are defined with the __init__ method identifier. Local attributes are accessed using the self keyword.

class Dog
{
   attribute name;

   method __init__(name)
   {
      self.name = name;
   }
}

var obj = MyObject("FooBar");

To access an attribute:

var name = obj.name;

Class Inheritance¶

The : token instead of extends in Javascript or Java.

class BetterObject
{
  ...
}

class EvenBetterObject : BetterObject
{
 ...
}

Module Constructors¶

Note

Adhoc Version 12 and above, but only starting from GT6.

Module constructors are completely new in Adhoc. They are very rarely used, but these are mostly used for initializing UI widgets with user data or with UI method events. They allow defining a constructor for any object that will run once the UI system sees a new object registered (i.e appendChild onto a composite)

var myObject = someWidget.doCopy();
module (myObject)
{
   attribute myAttr;

   method onCancel()
   {
      // ...
   }
}

myObject.myAttr; // ❌ myAttr is not yet defined!

Strings & Interpolation¶

There is only one type of string declaration, quotes.

var str = "Hello world!";
var combinedStrings = "hello"
                      "world!";

var interpolated = "hello, %{name}!"; // Notice %, instead of $ in javascript.

// Multi-line strings with interpolation is also supported and will be automatically concatenated.
var interpolatedWith = "hello"
                       "world! "
                       "My name is %{name}!";

Maps¶

Note

Adhoc Version 11 and above.

Maps are Key/Value collections, similar to javascript's map or C#'s dictionaries. Adhoc supports them natively.

var myMap = Map();
var myMap2 = [:]; // Shortcut to creation
var myMapWithElements = ["MyKey":"MyValue", "MyKey2": "MyValue2"]; // Creation with 2 pairs

myMap["hello"] = "world!";
myMap.getMapCount(); // 1
myMapWithElements.getMapCount(); // 2

List Assignments (array/map deconstruction)¶

Adhoc has a neat new feature where arrays can be deconstructed into variables directly.

The | syntax is used.

|var one, var two| = [1, 2];
// one = 1, two = 2

You can also assign into existing variables, module paths, or attributes:

attribute myAttribute;
static MyModule
{
    static MyStatic;
}

|myAttrbibute, MyModule::MyStatic| = [1, 2];

This syntax also supports nested deconstruction using the { and } syntax within a list assignment (not ever used by the games, but it exists):

|var one, {var two, var three}| = [1, [2, 3]];
// one = 1, two = 2, three = 3

You can also deconstruct one or multiple elements of an array, and the rest of the array into another variable, using the rest ... syntax:

|var one, var two...| = [1, 2, 3];
// one = 1, two = [2, 3]

In Functions¶

This syntax is also supported in functions. If you define a function as:

function myFunction({one, two})
{

}

And then call it as:

myFunction([1, 2]);

a and b will be defined as variables of the function and can be used right away.

Note that the rest syntax ... is still supported here.

Foreach¶

Note

Adhoc version 11 and above.

Adhoc supports foreach clauses.

var arr = ["one", "two", "three"];
var combined;
foreach (var i in arr)
  combined += i + " ";

// combined = "one two three "

You can also deconstruct arrays/maps in a foreach using the previously mentioned list assignment:

var map = ["Name": "Bob", "Age": 18];
foreach (|var key, var value| in map) // list assignment/deconstruction
{
    // ...
}

Native Number Types¶

By default, number literals are integers, aka Int.

You can define various different types of number literals:

var myInt = 1; // or Int(1);
var myUint = 1u; // or UInt(1), 1U
var myLong = 1l; // or Long(1), 1L
var myULong = 1ul; // or ULong(1), 1UL
var myFloat = 1.0; // or Float(1)
var myDouble = 1.0d; // or Double(1), 1.0D
var myByte = Byte(1); // signed byte
var myUByte = UByte(1);
var myShort = Short(1);
var myUShort = UShort(1);

UInt, Long, ULong, Double respectively are all natively built-in types starting from GT PSP Adhoc ontop of Bool, Int, Float.

Tip

If you declare a number trivially that will not fit in a Int, it will be promoted to the larger integer size, i.e 10000000000 will be compiled as a Long.

Imports¶

Imports are mostly used python-like.

import main::*; // Imports/copies all modules from the specified module into the current one.
import myModule::myFunction; // Imports/copies a static/function into the current one.
import myModule::myStatic as obj; // Imports a static into an object.

Preprocessor¶

Adhoc is closer to C in that regard, as it supports a preprocessor out of the box.

Includes¶

C-type includes are supported.

#include "projects/gt6/my_project/myinclude.ad"

Defines/Macros¶

// Trivial define
#define PI 3.14

// Macro
#define ADD(x,y) (x+y)
var val = ADD(5, 6)

// Multi-line macro
#define HELLO_WORLD() "hello" \
                      "world";

NOTE: Token concatenation ## is not supported on this toolchain's preprocessor yet.

Note

A list of builtin defines is available here.

Conditions¶

#if, #ifdef, #elseif, #else, #endif are supported.

#ifdef DEBUG
  ...
#endif

Function Gotchas¶

Default function values¶

Note

Adhoc version 7 and above.

function myFunction(a = 5) 
{

}

Captured Variables¶

Variables outside function expressions are captured.

var myVariable = 0;
var myFunc = function (){
  return myVariable + 100;
}

Arrow Functions¶

Warning

Arrow functions are not supported, presumably for consistency. Always declare a function with the function keyword, and curly brackets.

Rest Parameters¶

Note

Adhoc version 7 and above.

Identical to javascript except the syntax is swapped around.

function myFunction(args...) // Not ...args!
{
    ...
}

Code allowed everywhere¶

Top level, in module or class bodies, code is allowed everywhere.

module MyModule
{
    static myStaticArray = [];
    myStaticArray.push("hello world");
}

Module extensions are also allowed within function themselves.

function myFunction()
{
    module main
    {
        // Anything put here will be part of the "main" module.
        // Declaring a static variable will make it belong to the "main" module.
    }
}

Undefs¶

Undefs let you undefine functions or static symbols. Very rarely used.

function myFunction()
{
   ...
}

undef myFunction; // "myFunction" is undefined, now nil if called.

Operator Overloading¶

Adhoc supports fully overloading operators. Very rarely used, but supported.

class OperatorOverloadClassTest
{
    attribute value = "";

    method __init__(val)
    {
        self.value = val;
    }

    method __add__(val) // Needs to be the internal label for a designated operator, in this case, __add__ = +
    {
       return OperatorOverloadClassTest(value + val);
    }
}
var obj = MyOperatorOverloadingClass();
obj += "hello world!";
// obj.value is now "hello world!"

List of operators & their names for overriding:

Internal Name	Operator
Constructor	`__init__`
Object Creation	`__new__`
Super (?)	`__super__`
`()` (call)	`__call__`
Finalizer	`__fini__`
`[]` (getter)	`__get_attr__`
`[]` (setter)	`__set_attr__`
`+`	`__add__`
`-`	`__sub__`
`*`	`__mul__`
`/`	`__div__`
`%`	`__mod__`
`**`	`__pow__`
`~`	`__invert__`
`&`	`__and__`
`\\|`	`__or__`
`^`	`__xor__`
`@++`	`__post_incr__`
`@--`	`__post_decr__`
`++@`	`__pre_incr__`
`--@`	`__pre_decr__`
`==`	`__eq__`
`!=`	`__ne__`
`>=`	`__ge__`
`<=`	`__le__`
`<`	`__lt__`
`!`	`__not__`
`<<`	`__lshift__`
`>>`	`__rshift__`
`-@`	`__uminus__`
`+@`	`__uplus__`

Maybe __prototype__, __module__, __method__ based on GT7?

Static Scopes¶

Static fields can be accessed from any module or class depth.

module RootModule
{
  static sStaticField;

  module ChildModule
  {
    function setParentField()
    {
      sStaticfield = "hello world!";
    }
  }
}

Async/Await¶

Note

GT6 and above.

async function myAsyncFunction() // Must mark as async
{
  var result = await getObject();
}

Finalizer Statements¶

Finalizer statements allows running code once the current module is finalized/cleaned up. Rarely used.

function func(context)
{
  CursorUtil::setCursor(context, "wait"); // Set cursor to waiting mode
  finally
  {
      // This will be executed once the module is finalized.
      // It will not execute immediately.
      CursorUtil::setCursor(context, "cursor_chrome");
  } 
}

Yield Statements¶

Mostly unknown, may be similar to unity's yield statement where the runtime waits for the next frame.

function func(context)
{
  yield;
}

A value can also be passed to it (though purpose unknown):

function func(context)
{
  yield 1;
}

Requires¶

Requires allows importing all contents of a script onto the current one.

require "MyScript.adc"

Symbols¶

Similar to Javascript's Symbols, they are defined with single quotes.

var symbol = 'my cool symbol';

Variadic Function calls¶

Calling functions with their arguments being represented by an array can be called using the call() keyword:

function sum(arg1, arg2)
{
   return arg1 + arg2;
}

// call(func, argument array) - NOTE: function or method must be script defined.
call(sum, [9, 10]); // 21

Identifier Literals¶

Identifier literals allow defining identifiers with normally illegal characters incase you have to.

Mostly used for generated code. GT7's DumpBuiltinModule function uses this for instance.

var `my totally valid identifier` = "hello world";

module `my module`
{

}

Delegates¶

Note

GT Sport and above.

function myFunc()
{
    return "hello world";
}

delegate myDelegate; // It is not possible to directly assign a function to a delegate
myDelegate = myFunc; // This will not override myDelegate with a function, rather assign a function to the delegate
return myDelegate(); // "hello world"

Pass by reference¶

function getXY(x_ref, y_ref) // Common practice is to add the `_ref` suffix OR (less common) `ref_` prefix.
{
   *x_ref = 1;
   *y_ref = 1;
}

var x, y;
getXY(&x, &y);

// x = 1, y = 1

Note that you can also pass attributes/statics i.e &myobject.myattr or even array elements i.e &MyArray[0].

Object Selectors¶

Warning

This one is still sort of unclear.

This feature seems to allow calling grabbing method/attribute references using the .* operator.

scripts/gt5/UsedCarList.ad

method __get_elem__(i)
{
    return self.*attr_map[i];
}

method __set_elem__(i, val)
{
    self.*attr_map[i] = val;
}

projects/gt5/arcade/CarRoot.ad

var delay_load_complete = method(context)
{
    self.Info::FadeEffect.start();
}

self.Info::tuner_logo.on_delay_load_complete = *self.*delay_load_complete;

Optional Syntax¶

Note

GT Sport and above.

GT Sport introduced the JUMP_IF_NIL and LOGICAL_OPTIONAL instructions, which implements the Optional Chaining and Nullish Coalescing features in adhoc.

var myAttributeValue = myObject?.myAttribute;
if (myAttributeValue == nil)
    return;

Also works with arrays and object selectors:

var myValue = myObject?.*myVariable;
var myValue2 = myObject?["myAttributeName"];

Nullish coalescing works the same.

var myValue = myString ?? "default";

Not supported from javascript¶

Anything modern ECMAScript-ish features (arguably not needed).
let, const keywords are not implemented.
for..in and for..of are replaced by the much more convenient foreach.
===, !== operators
Dynamic objects var obj = {}
Everything else that hasn't been mentioned here.

Adhoc Language¶

Basic Things¶

Nulls: null = nil¶

Modules, Classes, Attributes and Statics¶

Modules & Statics¶

Attributes¶

Class Constructors¶

Class Inheritance¶

Module Constructors¶

Strings & Interpolation¶

Maps¶

List Assignments (array/map deconstruction)¶

In Functions¶

Foreach¶

Native Number Types¶

Imports¶

Preprocessor¶

Includes¶

Defines/Macros¶

Conditions¶

Function Gotchas¶

Default function values¶

Captured Variables¶

Arrow Functions¶

Rest Parameters¶

Code allowed everywhere¶

Undefs¶

Operator Overloading¶

Static Scopes¶

Async/Await¶

Finalizer Statements¶

Yield Statements¶

Requires¶

Symbols¶

Variadic Function calls¶

Identifier Literals¶

Delegates¶

Pass by reference¶

Object Selectors¶

Optional Syntax¶

Not supported from javascript¶

Nulls: `null` = `nil`¶