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<?php
/**
* This file is part of PDepend.
*
* PHP Version 5
*
* Copyright (c) 2008-2017 Manuel Pichler <[email protected]>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Manuel Pichler nor the names of his
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @copyright 2008-2017 Manuel Pichler. All rights reserved.
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
*/
namespace PDepend\Source\AST;
use PDepend\Source\ASTVisitor\ASTVisitor;
/**
* An instance of this class represents a function or method parameter within
* the analyzed source code.
*
* <code>
* <?php
* class Builder
* {
* public function buildNode($name, $line, ASTCompilationUnit $unit) {
* }
* }
*
* function parse(Builder $builder, $file) {
* }
* </code>
*
* @copyright 2008-2017 Manuel Pichler. All rights reserved.
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
*/
class ASTParameter extends AbstractASTArtifact
{
/**
* The parent function or method instance.
*
* @var AbstractASTCallable
*/
private $declaringFunction = null;
/**
* The parameter position.
*
* @var int
*/
private $position = 0;
/**
* Is this parameter optional or mandatory?
*
* @var bool
*/
private $optional = false;
/**
* The wrapped formal parameter instance.
*
* @var ASTFormalParameter
*/
private $formalParameter = null;
/**
* The wrapped variable declarator instance.
*
* @var ASTVariableDeclarator
*/
private $variableDeclarator = null;
/**
* Constructs a new parameter instance for the given AST node.
*/
public function __construct(ASTFormalParameter $formalParameter)
{
$this->formalParameter = $formalParameter;
$this->variableDeclarator = $formalParameter->getFirstChildOfType(
'PDepend\\Source\\AST\\ASTVariableDeclarator'
);
$this->id = spl_object_hash($this);
}
/**
* Returns the item name.
*
* @return string
*/
public function getName()
{
return $this->variableDeclarator->getImage();
}
/**
* Returns the line number where the item declaration can be found.
*
* @return int
*/
public function getStartLine()
{
return $this->formalParameter->getStartLine();
}
/**
* Returns the line number where the item declaration ends.
*
* @return int The last source line for this item.
*/
public function getEndLine()
{
return $this->formalParameter->getEndLine();
}
/**
* Returns the parent function or method instance or <b>null</b>
*
* @return AbstractASTCallable
*
* @since 0.9.5
*/
public function getDeclaringFunction()
{
return $this->declaringFunction;
}
/**
* Sets the parent function or method object.
*
* @return void
*
* @since 0.9.5
*/
public function setDeclaringFunction(AbstractASTCallable $function)
{
$this->declaringFunction = $function;
}
/**
* This method will return the class where the parent method was declared.
* The returned value will be <b>null</b> if the parent is a function.
*
* @todo Review this for refactoring, maybe create a empty getParent()?
*
* @return AbstractASTClassOrInterface|null
*
* @since 0.9.5
*/
public function getDeclaringClass()
{
if ($this->declaringFunction instanceof ASTMethod) {
return $this->declaringFunction->getParent();
}
return null;
}
/**
* Returns the parameter position in the method/function signature.
*
* @return int
*/
public function getPosition()
{
return $this->position;
}
/**
* Sets the parameter position in the method/function signature.
*
* @param int $position The parameter position.
*
* @return void
*/
public function setPosition($position)
{
$this->position = $position;
}
/**
* Returns the class type of this parameter. This method will return
* <b>null</b> for all scalar type, only classes or interfaces are used.
*
* @return AbstractASTClassOrInterface|null
*
* @since 0.9.5
*/
public function getClass()
{
$classReference = $this->formalParameter->getFirstChildOfType(
'PDepend\\Source\\AST\\ASTClassOrInterfaceReference'
);
if ($classReference === null) {
return null;
}
return $classReference->getType();
}
/**
* This method will return <b>true</b> when the parameter is passed by
* reference.
*
* @return bool
*
* @since 0.9.5
*/
public function isPassedByReference()
{
return $this->formalParameter->isPassedByReference();
}
/**
* This method will return <b>true</b> when the parameter was declared with
* the array type hint, otherwise the it will return <b>false</b>.
*
* @return bool
*
* @since 0.9.5
*/
public function isArray()
{
$node = $this->formalParameter->getChild(0);
return ($node instanceof ASTTypeArray);
}
/**
* This method will return <b>true</b> when current parameter is a simple
* scalar or it is an <b>array</b> or type explicit declared with a default
* value <b>null</b>.
*
* @return bool
*
* @since 0.9.5
*/
public function allowsNull()
{
$node = $this->formalParameter->getChild(0);
if ($this->isTypeAllowingNull($node)) {
return true;
}
if (!($node instanceof ASTTypeArray)
&& !($node instanceof ASTScalarType)
&& $this->getClass() === null
) {
return true;
}
if ($this->isDefaultValueAvailable() && $this->getDefaultValue() === null) {
return true;
}
return false;
}
/**
* This method will return <b>true</b> when this parameter is optional and
* can be left blank on invocation.
*
* @return bool
*
* @since 0.9.5
*/
public function isOptional()
{
return $this->optional;
}
/**
* This method can be used to mark a parameter optional. Note that a
* parameter is only optional when it has a default value an no following
* parameter has no default value.
*
* @param bool $optional Boolean flag that marks this parameter a
* optional or not.
*
* @return void
*
* @since 0.9.5
*/
public function setOptional($optional)
{
$this->optional = (boolean) $optional;
}
/**
* This method will return <b>true</b> when the parameter declaration
* contains a default value.
*
* @return bool
*
* @since 0.9.5
*/
public function isDefaultValueAvailable()
{
$value = $this->variableDeclarator->getValue();
if ($value === null) {
return false;
}
return $value->isValueAvailable();
}
/**
* This method will return the declared default value for this parameter.
* Please note that this method will return <b>null</b> when no default
* value was declared, therefore you should combine calls to this method and
* {@link ASTParameter::isDefaultValueAvailable()} to
* detect a NULL-value.
*
* @return mixed
*
* @since 0.9.5
*/
public function getDefaultValue()
{
$value = $this->variableDeclarator->getValue();
return $value === null ? null : $value->getValue();
}
/**
* Returns the wrapped formal parameter instance.
*
* @return ASTFormalParameter
*/
public function getFormalParameter()
{
return $this->formalParameter;
}
/**
* This method returns a string representation of this parameter.
*
* @return string
*/
public function __toString()
{
$required = $this->isOptional() ? 'optional' : 'required';
$reference = $this->isPassedByReference() ? '&' : '';
$typeHint = '';
if ($this->isArray() === true) {
$typeHint = ' array';
} elseif ($this->getClass() !== null) {
$typeHint = ' ' . $this->getClass()->getName();
}
$default = '';
if ($this->isDefaultValueAvailable()) {
$default = ' = ';
$value = $this->getDefaultValue();
if ($value === null) {
$default .= 'NULL';
$typeHint .= ($typeHint !== '' ? ' or NULL' : '');
} elseif ($value === false) {
$default .= 'false';
} elseif ($value === true) {
$default .= 'true';
} elseif (is_array($value) === true) {
$default .= 'Array';
} elseif (is_string($value) === true) {
$default .= "'" . $value . "'";
} else {
$default .= $value;
}
}
return sprintf(
'Parameter #%d [ <%s>%s %s%s%s ]',
$this->position,
$required,
$typeHint,
$reference,
$this->getName(),
$default
);
}
/**
* @param ASTNode $node
*
* @return bool
*/
private function isTypeAllowingNull($node)
{
if ($node instanceof ASTUnionType) {
foreach ($node->getChildren() as $child) {
if ($this->isTypeAllowingNull($child)) {
return true;
}
}
}
return $node instanceof ASTScalarType && $node->isNull();
}
}