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<?php
/**
* PHPCSUtils, utility functions and classes for PHP_CodeSniffer sniff developers.
*
* @package PHPCSUtils
* @copyright 2019-2020 PHPCSUtils Contributors
* @license https://opensource.org/licenses/LGPL-3.0 LGPL3
* @link https://github.com/PHPCSStandards/PHPCSUtils
*/
namespace PHPCSUtils\Utils;
use PHP_CodeSniffer\Exceptions\RuntimeException;
use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Util\Tokens;
use PHPCSUtils\BackCompat\BCFile;
use PHPCSUtils\Internal\Cache;
use PHPCSUtils\Tokens\Collections;
use PHPCSUtils\Utils\Conditions;
use PHPCSUtils\Utils\GetTokensAsString;
use PHPCSUtils\Utils\Parentheses;
/**
* Utility functions for use when examining T_NAMESPACE tokens and to determine the
* namespace of arbitrary tokens.
*
* @link https://www.php.net/language.namespaces PHP Manual on namespaces.
*
* @since 1.0.0
*/
final class Namespaces
{
/**
* Determine what a T_NAMESPACE token is used for.
*
* @since 1.0.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $stackPtr The position of the `T_NAMESPACE` token.
*
* @return string Either `'declaration'`, `'operator'` or an empty string.
* An empty string will be returned if it couldn't be
* reliably determined what the `T_NAMESPACE` token is used for,
* which, in most cases, will mean the code contains a parse/fatal error.
*
* @throws \PHP_CodeSniffer\Exceptions\RuntimeException If the specified position is
* not a `T_NAMESPACE` token.
*/
public static function getType(File $phpcsFile, $stackPtr)
{
static $findAfter;
if (isset($findAfter) === false) {
/*
* Set up array of tokens which can only be used in combination with the keyword as operator
* and which cannot be confused with other keywords.
*/
$findAfter = Tokens::$assignmentTokens
+ Tokens::$comparisonTokens
+ Tokens::$operators
+ Tokens::$castTokens
+ Tokens::$blockOpeners
+ Collections::incrementDecrementOperators()
+ Collections::objectOperators()
+ Collections::shortArrayListOpenTokensBC();
$findAfter[\T_OPEN_CURLY_BRACKET] = \T_OPEN_CURLY_BRACKET;
}
$tokens = $phpcsFile->getTokens();
if (isset($tokens[$stackPtr]) === false || $tokens[$stackPtr]['code'] !== \T_NAMESPACE) {
throw new RuntimeException('$stackPtr must be of type T_NAMESPACE');
}
$next = $phpcsFile->findNext(Tokens::$emptyTokens, ($stackPtr + 1), null, true);
if ($next === false) {
// Live coding or parse error.
return '';
}
if (empty($tokens[$stackPtr]['conditions']) === false
|| empty($tokens[$stackPtr]['nested_parenthesis']) === false
) {
/*
* Namespace declarations are only allowed at top level, so this can definitely not
* be a namespace declaration.
*/
if ($tokens[$next]['code'] === \T_NS_SEPARATOR) {
return 'operator';
}
return '';
}
$start = BCFile::findStartOfStatement($phpcsFile, $stackPtr);
if ($start === $stackPtr
&& ($tokens[$next]['code'] === \T_STRING
|| $tokens[$next]['code'] === \T_NAME_QUALIFIED
|| $tokens[$next]['code'] === \T_OPEN_CURLY_BRACKET)
) {
return 'declaration';
}
if (($tokens[$next]['code'] === \T_NS_SEPARATOR
|| $tokens[$next]['code'] === \T_NAME_FULLY_QUALIFIED) // PHP 8.0 parse error.
&& ($start !== $stackPtr
|| $phpcsFile->findNext($findAfter, ($stackPtr + 1), null, false, null, true) !== false)
) {
return 'operator';
}
return '';
}
/**
* Determine whether a T_NAMESPACE token is the keyword for a namespace declaration.
*
* @since 1.0.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $stackPtr The position of a `T_NAMESPACE` token.
*
* @return bool `TRUE` if the token passed is the keyword for a namespace declaration.
* `FALSE` if not.
*
* @throws \PHP_CodeSniffer\Exceptions\RuntimeException If the specified position is
* not a `T_NAMESPACE` token.
*/
public static function isDeclaration(File $phpcsFile, $stackPtr)
{
return (self::getType($phpcsFile, $stackPtr) === 'declaration');
}
/**
* Determine whether a T_NAMESPACE token is used as an operator.
*
* @link https://www.php.net/language.namespaces.nsconstants PHP Manual about the use of the
* namespace keyword as an operator.
*
* @since 1.0.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $stackPtr The position of a `T_NAMESPACE` token.
*
* @return bool `TRUE` if the namespace token passed is used as an operator. `FALSE` if not.
*
* @throws \PHP_CodeSniffer\Exceptions\RuntimeException If the specified position is
* not a `T_NAMESPACE` token.
*/
public static function isOperator(File $phpcsFile, $stackPtr)
{
return (self::getType($phpcsFile, $stackPtr) === 'operator');
}
/**
* Get the complete namespace name as declared.
*
* For hierarchical namespaces, the namespace name will be composed of several tokens,
* i.e. "MyProject\Sub\Level", which will be returned together as one string.
*
* @since 1.0.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $stackPtr The position of a `T_NAMESPACE` token.
* @param bool $clean Optional. Whether to get the name stripped
* of potentially interlaced whitespace and/or
* comments. Defaults to `true`.
*
* @return string|false The namespace name; or `FALSE` if the specified position is not a
* `T_NAMESPACE` token, the token points to a namespace operator
* or when parse errors are encountered/during live coding.
* > Note: The name can be an empty string for a valid global
* namespace declaration.
*/
public static function getDeclaredName(File $phpcsFile, $stackPtr, $clean = true)
{
try {
if (self::isDeclaration($phpcsFile, $stackPtr) === false) {
// Not a namespace declaration.
return false;
}
} catch (RuntimeException $e) {
// Non-existent token or not a namespace keyword token.
return false;
}
$endOfStatement = $phpcsFile->findNext(Collections::namespaceDeclarationClosers(), ($stackPtr + 1));
if ($endOfStatement === false) {
// Live coding or parse error.
return false;
}
$next = $phpcsFile->findNext(Tokens::$emptyTokens, ($stackPtr + 1), ($endOfStatement + 1), true);
if ($next === $endOfStatement) {
// Declaration of global namespace. I.e.: namespace {}.
// If not a scoped {} namespace declaration, no name/global declarations are invalid
// and result in parse errors, but that's not our concern.
return '';
}
if ($clean === false) {
return \trim(GetTokensAsString::origContent($phpcsFile, $next, ($endOfStatement - 1)));
}
return \trim(GetTokensAsString::noEmpties($phpcsFile, $next, ($endOfStatement - 1)));
}
/**
* Find the stack pointer to the namespace declaration applicable for an arbitrary token.
*
* Take note:
* 1. When a namespace declaration token or a token which is part of the namespace
* name is passed to this method, the result will be `false` as technically, these tokens
* are not _within_ a namespace.
* 2. This method has no opinion on whether the token passed is actually _subject_
* to namespacing.
*
* @since 1.0.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $stackPtr The token for which to determine
* the namespace.
*
* @return int|false Token pointer to the namespace keyword for the applicable namespace
* declaration; or `FALSE` if it couldn't be determined or
* if no namespace applies.
*/
public static function findNamespacePtr(File $phpcsFile, $stackPtr)
{
$tokens = $phpcsFile->getTokens();
// Check for the existence of the token.
if (isset($tokens[$stackPtr]) === false) {
return false;
}
// The namespace keyword in a namespace declaration is itself not namespaced.
if ($tokens[$stackPtr]['code'] === \T_NAMESPACE
&& self::isDeclaration($phpcsFile, $stackPtr) === true
) {
return false;
}
// Check for scoped namespace {}.
$namespacePtr = Conditions::getCondition($phpcsFile, $stackPtr, \T_NAMESPACE);
if ($namespacePtr !== false) {
return $namespacePtr;
}
/*
* Not in a scoped namespace, so let's see if we can find a non-scoped namespace instead.
* Keeping in mind that:
* - there can be multiple non-scoped namespaces in a file (bad practice, but is allowed);
* - the namespace keyword can also be used as an operator;
* - a non-named namespace resolves to the global namespace;
* - and that namespace declarations can't be nested in anything, so we can skip over any
* nesting structures.
*/
if (Cache::isCached($phpcsFile, __METHOD__, $stackPtr) === true) {
return Cache::get($phpcsFile, __METHOD__, $stackPtr);
}
// Start by breaking out of any scoped structures this token is in.
$prev = $stackPtr;
$firstCondition = Conditions::getFirstCondition($phpcsFile, $stackPtr);
if ($firstCondition !== false) {
$prev = $firstCondition;
}
// And break out of any surrounding parentheses as well.
$firstParensOpener = Parentheses::getFirstOpener($phpcsFile, $prev);
if ($firstParensOpener !== false) {
$prev = $firstParensOpener;
}
$find = [
\T_NAMESPACE,
\T_CLOSE_CURLY_BRACKET,
\T_CLOSE_PARENTHESIS,
\T_CLOSE_SHORT_ARRAY,
\T_CLOSE_SQUARE_BRACKET,
\T_DOC_COMMENT_CLOSE_TAG,
\T_ATTRIBUTE_END,
];
$returnValue = false;
do {
$prev = $phpcsFile->findPrevious($find, ($prev - 1));
if ($prev === false) {
break;
}
if ($tokens[$prev]['code'] === \T_CLOSE_CURLY_BRACKET) {
// Stop if we encounter a scoped namespace declaration as we already know we're not in one.
if (isset($tokens[$prev]['scope_condition']) === true
&& $tokens[$tokens[$prev]['scope_condition']]['code'] === \T_NAMESPACE
) {
break;
}
// Skip over other scoped structures for efficiency.
if (isset($tokens[$prev]['scope_condition']) === true) {
$prev = $tokens[$prev]['scope_condition'];
} elseif (isset($tokens[$prev]['scope_opener']) === true) {
// Shouldn't be possible, but just in case.
$prev = $tokens[$prev]['scope_opener']; // @codeCoverageIgnore
}
continue;
}
// Skip over other nesting structures for efficiency.
if (isset($tokens[$prev]['bracket_opener']) === true) {
$prev = $tokens[$prev]['bracket_opener'];
continue;
}
if (isset($tokens[$prev]['parenthesis_owner']) === true) {
$prev = $tokens[$prev]['parenthesis_owner'];
continue;
} elseif (isset($tokens[$prev]['parenthesis_opener']) === true) {
$prev = $tokens[$prev]['parenthesis_opener'];
continue;
}
// Skip over potentially large attributes.
if (isset($tokens[$prev]['attribute_opener'])) {
$prev = $tokens[$prev]['attribute_opener'];
continue;
}
// Skip over potentially large docblocks.
if (isset($tokens[$prev]['comment_opener'])) {
$prev = $tokens[$prev]['comment_opener'];
continue;
}
// So this is a namespace keyword, check if it's a declaration.
if ($tokens[$prev]['code'] === \T_NAMESPACE
&& self::isDeclaration($phpcsFile, $prev) === true
) {
// Now make sure the token was not part of the declaration.
$endOfStatement = $phpcsFile->findNext(Collections::namespaceDeclarationClosers(), ($prev + 1));
if ($endOfStatement > $stackPtr) {
// Token is part of the declaration, return false.
break;
}
$returnValue = $prev;
break;
}
} while (true);
Cache::set($phpcsFile, __METHOD__, $stackPtr, $returnValue);
return $returnValue;
}
/**
* Determine the namespace name an arbitrary token lives in.
*
* Note: this method has no opinion on whether the token passed is actually _subject_
* to namespacing.
*
* @since 1.0.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $stackPtr The token for which to determine
* the namespace.
*
* @return string Namespace name; or an empty string if the namespace couldn't be
* determined or when no namespace applies.
*/
public static function determineNamespace(File $phpcsFile, $stackPtr)
{
$namespacePtr = self::findNamespacePtr($phpcsFile, $stackPtr);
if ($namespacePtr === false) {
return '';
}
$namespace = self::getDeclaredName($phpcsFile, $namespacePtr);
if ($namespace !== false) {
return $namespace;
}
return '';
}
}