<?hh // strict

/**

* Copyright (c) 2015-present, Facebook, Inc.

* All rights reserved.

*

* This source code is licensed under the BSD-style license found in the

* LICENSE file in the root directory of this source tree. An additional grant

* of patent rights can be found in the PATENTS file in the same directory.

*/

/**

* Base class to generate a method or a constructor.

* See CodegenMethod or CodegenConstructor

*/

abstract class CodegenMethodBase extends CodegenFunctionBase

implements ICodeBuilderRenderer {

use CodegenWithVisibility;

protected bool $isAbstract = false;

protected bool $isStatic = false;

private bool $isFinal = false;

private ?CodegenClassBase $containingClass = null;

public function setIsFinal(bool $value = true): this {

$this->isFinal = $value;

return $this;

}

public function setIsAbstract(bool $value = true): this {

$this->isAbstract = $value;

return $this;

}

public function setIsStatic(bool $value = true): this {

$this->isStatic = $value;

return $this;

}

public function isAbstract(): bool {

return $this->isAbstract;

}

public function isStatic(): bool {

return $this->isStatic;

}

public function setContainingClass(CodegenClassBase $class): this {

$this->containingClass = $class;

if ($this->containingClass instanceof CodegenInterface) {

$this->isAbstract = true;

}

return $this;

}

private function getFunctionDeclaration(): string {

// $keywords is shared by both single and multi line declaration

$keywords = hack_builder()

->addIf($this->isFinal && !$this->isAbstract, 'final ')

->addIf(

$this->isAbstract &&

!($this->containingClass instanceof CodegenInterface),

'abstract '

)

->add($this->getVisibility() . ' ')

->addIf($this->isStatic, 'static ')

->addIf($this->isAsync && !$this->isAbstract, 'async ')

->add('function ')

->getCode();

return $this->getFunctionDeclarationBase($keywords, $this->isAbstract);

}

public function appendToBuilder(HackBuilder $builder): HackBuilder {

$id = '';

if ($this->isManualBody()) {

invariant($this->containingClass, 'The method should belong to a class');

$id = $this->containingClass->getName() . '::';

}

$func_declaration = $this->getFunctionDeclaration();

return

$this->appendToBuilderBase(

$builder,

$func_declaration,

$this->isAbstract,

$id

);

}

}