mirror of
https://github.com/godotengine/godot.git
synced 2024-11-21 03:18:37 +08:00
73 lines
2.5 KiB
XML
73 lines
2.5 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
|
|
<class name="Expression" inherits="Reference" category="Core" version="3.1">
|
|
<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(get_error_text())
|
|
return
|
|
var result = expression.execute([], null, true)
|
|
if not expression.has_execute_failed():
|
|
$LineEdit.text = str(result)
|
|
[/codeblock]
|
|
</description>
|
|
<tutorials>
|
|
</tutorials>
|
|
<demos>
|
|
</demos>
|
|
<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].
|
|
</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="PoolStringArray" default="PoolStringArray( )">
|
|
</argument>
|
|
<description>
|
|
Parses the expression and returns a [enum @GlobalScope.Error].
|
|
</description>
|
|
</method>
|
|
</methods>
|
|
<constants>
|
|
</constants>
|
|
</class>
|