Expression

Inherits: Reference < Object A class that stores an expression you can execute.

Description

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. sqrt(pow(3,2) + pow(4,2)). LineEdit node to write our expression and show the result.

  1. onready var expression = Expression.new()func _ready():    $LineEdit.connect("text_entered", self, "_on_text_entered")func _on_text_entered(command):    var error = expression.parse(command, [])    if error != OK:        print(expression.get_error_text())        return    var result = expression.execute([], null, true)    if not expression.has_execute_failed():        $LineEdit.text = str(result)

Methods

Method Descriptions

  • Variant execute ( Array inputs=[ ], Object base_instance=null, bool show_error=true ) parse and returns the result. Before you use the returned object, you should check if the method failed by calling has_execute_failed. parse, you can specify their values in the inputs array, in the same order.
  • String get_error_text ( ) const parse has failed.
  • bool has_execute_failed ( ) const true if execute has failed.
  • Error parse ( String expression, PoolStringArray input_names=PoolStringArray( ) ) Error code. input_names, so that you can bind them when it gets executed.