Inheritance #

Expression #

is_refcounted, is_instantiable, core, not_builtin_classes

A class that stores an expression you can execute.

An expression can be made of any arithmetic operation, built-in math function call, method call of a passed instance, or built-in type construction call.

An example expression text using the built-in math functions could be sqrt(pow(3, 2) + pow(4, 2)).

In the following example we use a LineEdit node to write our expression and show the result.

GDScript

var expression = Expression.new()

func _ready():
    $LineEdit.text_submitted.connect(self._on_text_submitted)

func _on_text_submitted(command):
    var error = expression.parse(command)
    if error != OK:
        print(expression.get_error_text())
        return
    var result = expression.execute()
    if not expression.has_execute_failed():
        $LineEdit.text = str(result)

C#

private Expression _expression = new Expression();

public override void _Ready()
{
    GetNode("LineEdit").TextSubmitted += OnTextEntered;
}

private void OnTextEntered(string command)
{
    Error error = _expression.Parse(command);
    if (error != Error.Ok)
    {
        GD.Print(_expression.GetErrorText());
        return;
    }
    Variant result = _expression.Execute();
    if (!_expression.HasExecuteFailed())
    {
        GetNode("LineEdit").Text = result.ToString();
    }
}

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