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f5836b40d4
For the time being we don't support writing a description for those, preferring
having all details in the method's description.
Using self-closing tags saves half the lines, and prevents contributors from
thinking that they should write the argument or return documentation there.
(cherry picked from commit 7adf4cc9b5)
64 lines
2.6 KiB
XML
64 lines
2.6 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Expression" inherits="Reference" version="3.4">
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<brief_description>
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A class that stores an expression you can execute.
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</brief_description>
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<description>
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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.
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An example expression text using the built-in math functions could be [code]sqrt(pow(3,2) + pow(4,2))[/code].
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In the following example we use a [LineEdit] node to write our expression and show the result.
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[codeblock]
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onready var expression = Expression.new()
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func _ready():
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$LineEdit.connect("text_entered", self, "_on_text_entered")
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func _on_text_entered(command):
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var error = expression.parse(command, [])
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if error != OK:
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print(expression.get_error_text())
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return
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var result = expression.execute([], null, true)
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if not expression.has_execute_failed():
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$LineEdit.text = str(result)
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[/codeblock]
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="execute">
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<return type="Variant" />
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<argument index="0" name="inputs" type="Array" default="[ ]" />
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<argument index="1" name="base_instance" type="Object" default="null" />
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<argument index="2" name="show_error" type="bool" default="true" />
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<description>
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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].
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If you defined input variables in [method parse], you can specify their values in the inputs array, in the same order.
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</description>
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</method>
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<method name="get_error_text" qualifiers="const">
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<return type="String" />
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<description>
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Returns the error text if [method parse] has failed.
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</description>
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</method>
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<method name="has_execute_failed" qualifiers="const">
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<return type="bool" />
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<description>
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Returns [code]true[/code] if [method execute] has failed.
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</description>
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</method>
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<method name="parse">
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<return type="int" enum="Error" />
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<argument index="0" name="expression" type="String" />
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<argument index="1" name="input_names" type="PoolStringArray" default="PoolStringArray( )" />
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<description>
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Parses the expression and returns an [enum Error] code.
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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.
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</description>
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</method>
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</methods>
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<constants>
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</constants>
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</class>
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