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<?xml version="1.0" encoding="UTF-8" ?>
<class name="Expression" inherits="Reference" version="4.0">
<brief_description>
A class that stores an expression you can execute.
</brief_description>
<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.
An example expression text using the built-in math functions could be [code]sqrt(pow(3,2) + pow(4,2))[/code].
In the following example we use a [LineEdit] node to write our expression and show the result.
[codeblock]
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)
[/codeblock]
</description>
<tutorials>
</tutorials>
<methods>
<method name="execute">
<return type="Variant">
</return>
<argument index="0" name="inputs" type="Array" default="[ ]">
</argument>
<argument index="1" name="base_instance" type="Object" default="null">
</argument>
<argument index="2" name="show_error" type="bool" default="true">
</argument>
<description>
Executes the expression that was previously parsed by [method parse] and returns the result. Before you use the returned object, you should check if the method failed by calling [method has_execute_failed].
If you defined input variables in [method parse], you can specify their values in the inputs array, in the same order.
</description>
</method>
<method name="get_error_text" qualifiers="const">
<return type="String">
</return>
<description>
Returns the error text if [method parse] has failed.
</description>
</method>
<method name="has_execute_failed" qualifiers="const">
<return type="bool">
</return>
<description>
Returns [code]true[/code] if [method execute] has failed.
</description>
</method>
<method name="parse">
<return type="int" enum="Error">
</return>
<argument index="0" name="expression" type="String">
</argument>
<argument index="1" name="input_names" type="PackedStringArray" default="PackedStringArray( )">
</argument>
<description>
Parses the expression and returns an [enum Error] code.
You can optionally specify names of variables that may appear in the expression with [code]input_names[/code], so that you can bind them when it gets executed.
</description>
</method>
</methods>
<constants>
</constants>
</class>
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