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<?php

namespace LanguageServer\FqnUtilities;

use phpDocumentor\Reflection\{Type, Types};

/**

* Returns all possible FQNs in a type

*

* @param Type|null $type

* @return string[]

*/

function getFqnsFromType($type): array

{

$fqns = [];

if ($type instanceof Types\Object_) {

$fqsen = $type->getFqsen();

if ($fqsen !== null) {

$fqns[] = substr((string)$fqsen, 1);

}

}

if ($type instanceof Types\Compound) {

for ($i = 0; $t = $type->get($i); $i++) {

foreach (getFqnsFromType($t) as $fqn) {

$fqns[] = $fqn;

}

}

}

return $fqns;

}

/**

* Returns parent of an FQN.

*

* getFqnParent('') === ''

* getFqnParent('\\') === ''

* getFqnParent('\A') === ''

* getFqnParent('A') === ''

* getFqnParent('\A\') === '\A' // Empty trailing name is considered a name.

*

* @return string

*/

function nameGetParent(string $name): string

{

if ($name === '') { // Special-case handling for the root namespace.

return '';

}

$parts = explode('\\', $name);

array_pop($parts);

return implode('\\', $parts);

}

/**

* Concatenates two names.

*

* nameConcat('\Foo\Bar', 'Baz') === '\Foo\Bar\Baz'

* nameConcat('\Foo\Bar\\', '\Baz') === '\Foo\Bar\Baz'

* nameConcat('\\', 'Baz') === '\Baz'

* nameConcat('', 'Baz') === 'Baz'

*

* @return string

*/

function nameConcat(string $a, string $b): string

{

if ($a === '') {

return $b;

}

$a = rtrim($a, '\\');

$b = ltrim($b, '\\');

return "$a\\$b";

}

/**

* Returns the first component of $name.

*

* nameGetFirstPart('Foo\Bar') === 'Foo'

* nameGetFirstPart('\Foo\Bar') === 'Foo'

* nameGetFirstPart('') === ''

* nameGetFirstPart('\') === ''

*/

function nameGetFirstPart(string $name): string

{

$parts = explode('\\', $name, 3);

if ($parts[0] === '' && count($parts) > 1) {

return $parts[1];

} else {

return $parts[0];

}

}

/**

* Removes the first component of $name.

*

* nameWithoutFirstPart('Foo\Bar') === 'Bar'

* nameWithoutFirstPart('\Foo\Bar') === 'Bar'

* nameWithoutFirstPart('') === ''

* nameWithoutFirstPart('\') === ''

*/

function nameWithoutFirstPart(string $name): string

{

$parts = explode('\\', $name, 3);

if ($parts[0] === '') {

array_shift($parts);

}

array_shift($parts);

return implode('\\', $parts);

}

/**

* @param string $name Name to match against

* @param string $prefix Prefix $name has to starts with

* @return bool

*/

function nameStartsWith(string $name, string $prefix): bool

{

return strlen($name) >= strlen($prefix)

&& strncmp($name, $prefix, strlen($prefix)) === 0;

}