88 lines
3.3 KiB
XML
88 lines
3.3 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
|
|
<class name="Expression" inherits="RefCounted" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
|
|
<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.
|
|
[codeblocks]
|
|
[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)
|
|
[/gdscript]
|
|
[csharp]
|
|
public Expression expression = new Expression();
|
|
|
|
public override void _Ready()
|
|
{
|
|
GetNode<LineEdit>("LineEdit").TextSubmitted += OnTextEntered;
|
|
}
|
|
|
|
private void OnTextEntered(string command)
|
|
{
|
|
Error error = expression.Parse(command);
|
|
if (error != Error.Ok)
|
|
{
|
|
GD.Print(expression.GetErrorText());
|
|
return;
|
|
}
|
|
object result = expression.Execute();
|
|
if (!expression.HasExecuteFailed())
|
|
{
|
|
GetNode<LineEdit>("LineEdit").Text = result.ToString();
|
|
}
|
|
}
|
|
[/csharp]
|
|
[/codeblocks]
|
|
</description>
|
|
<tutorials>
|
|
</tutorials>
|
|
<methods>
|
|
<method name="execute">
|
|
<return type="Variant" />
|
|
<param index="0" name="inputs" type="Array" default="[]" />
|
|
<param index="1" name="base_instance" type="Object" default="null" />
|
|
<param index="2" name="show_error" type="bool" default="true" />
|
|
<param index="3" name="const_calls_only" type="bool" default="false" />
|
|
<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" />
|
|
<description>
|
|
Returns the error text if [method parse] has failed.
|
|
</description>
|
|
</method>
|
|
<method name="has_execute_failed" qualifiers="const">
|
|
<return type="bool" />
|
|
<description>
|
|
Returns [code]true[/code] if [method execute] has failed.
|
|
</description>
|
|
</method>
|
|
<method name="parse">
|
|
<return type="int" enum="Error" />
|
|
<param index="0" name="expression" type="String" />
|
|
<param index="1" name="input_names" type="PackedStringArray" default="PackedStringArray()" />
|
|
<description>
|
|
Parses the expression and returns an [enum Error] code.
|
|
You can optionally specify names of variables that may appear in the expression with [param input_names], so that you can bind them when it gets executed.
|
|
</description>
|
|
</method>
|
|
</methods>
|
|
</class>
|