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File Content: NameContext.php

<?php declare(strict_types=1);

namespace PhpParser;

use PhpParser\Node\Name;
use PhpParser\Node\Name\FullyQualified;
use PhpParser\Node\Stmt;

class NameContext {
    /** @var null|Name Current namespace */
    protected ?Name $namespace;

/** @var Name[][] Map of format [aliasType => [aliasName => originalName]] */
    protected array $aliases = [];

/** @var Name[][] Same as $aliases but preserving original case */
    protected array $origAliases = [];

/** @var ErrorHandler Error handler */
    protected ErrorHandler $errorHandler;

/**
     * Create a name context.
     *
     * @param ErrorHandler $errorHandler Error handling used to report errors
     */
    public function __construct(ErrorHandler $errorHandler) {
        $this->errorHandler = $errorHandler;
    }

/**
     * Start a new namespace.
     *
     * This also resets the alias table.
     *
     * @param Name|null $namespace Null is the global namespace
     */
    public function startNamespace(?Name $namespace = null): void {
        $this->namespace = $namespace;
        $this->origAliases = $this->aliases = [
            Stmt\Use_::TYPE_NORMAL   => [],
            Stmt\Use_::TYPE_FUNCTION => [],
            Stmt\Use_::TYPE_CONSTANT => [],
        ];
    }

/**
     * Add an alias / import.
     *
     * @param Name $name Original name
     * @param string $aliasName Aliased name
     * @param Stmt\Use_::TYPE_* $type One of Stmt\Use_::TYPE_*
     * @param array<string, mixed> $errorAttrs Attributes to use to report an error
     */
    public function addAlias(Name $name, string $aliasName, int $type, array $errorAttrs = []): void {
        // Constant names are case sensitive, everything else case insensitive
        if ($type === Stmt\Use_::TYPE_CONSTANT) {
            $aliasLookupName = $aliasName;
        } else {
            $aliasLookupName = strtolower($aliasName);
        }

if (isset($this->aliases[$type][$aliasLookupName])) {
            $typeStringMap = [
                Stmt\Use_::TYPE_NORMAL   => '',
                Stmt\Use_::TYPE_FUNCTION => 'function ',
                Stmt\Use_::TYPE_CONSTANT => 'const ',
            ];

$this->errorHandler->handleError(new Error(
                sprintf(
                    'Cannot use %s%s as %s because the name is already in use',
                    $typeStringMap[$type], $name, $aliasName
                ),
                $errorAttrs
            ));
            return;
        }

$this->aliases[$type][$aliasLookupName] = $name;
        $this->origAliases[$type][$aliasName] = $name;
    }

/**
     * Get current namespace.
     *
     * @return null|Name Namespace (or null if global namespace)
     */
    public function getNamespace(): ?Name {
        return $this->namespace;
    }

/**
     * Get resolved name.
     *
     * @param Name $name Name to resolve
     * @param Stmt\Use_::TYPE_* $type One of Stmt\Use_::TYPE_{FUNCTION|CONSTANT}
     *
     * @return null|Name Resolved name, or null if static resolution is not possible
     */
    public function getResolvedName(Name $name, int $type): ?Name {
        // don't resolve special class names
        if ($type === Stmt\Use_::TYPE_NORMAL && $name->isSpecialClassName()) {
            if (!$name->isUnqualified()) {
                $this->errorHandler->handleError(new Error(
                    sprintf("'\\%s' is an invalid class name", $name->toString()),
                    $name->getAttributes()
                ));
            }
            return $name;
        }

// fully qualified names are already resolved
        if ($name->isFullyQualified()) {
            return $name;
        }

// Try to resolve aliases
        if (null !== $resolvedName = $this->resolveAlias($name, $type)) {
            return $resolvedName;
        }

if ($type !== Stmt\Use_::TYPE_NORMAL && $name->isUnqualified()) {
            if (null === $this->namespace) {
                // outside of a namespace unaliased unqualified is same as fully qualified
                return new FullyQualified($name, $name->getAttributes());
            }

// Cannot resolve statically
            return null;
        }

// if no alias exists prepend current namespace
        return FullyQualified::concat($this->namespace, $name, $name->getAttributes());
    }

/**
     * Get resolved class name.
     *
     * @param Name $name Class ame to resolve
     *
     * @return Name Resolved name
     */
    public function getResolvedClassName(Name $name): Name {
        return $this->getResolvedName($name, Stmt\Use_::TYPE_NORMAL);
    }

/**
     * Get possible ways of writing a fully qualified name (e.g., by making use of aliases).
     *
     * @param string $name Fully-qualified name (without leading namespace separator)
     * @param Stmt\Use_::TYPE_* $type One of Stmt\Use_::TYPE_*
     *
     * @return Name[] Possible representations of the name
     */
    public function getPossibleNames(string $name, int $type): array {
        $lcName = strtolower($name);

if ($type === Stmt\Use_::TYPE_NORMAL) {
            // self, parent and static must always be unqualified
            if ($lcName === "self" || $lcName === "parent" || $lcName === "static") {
                return [new Name($name)];
            }
        }

// Collect possible ways to write this name, starting with the fully-qualified name
        $possibleNames = [new FullyQualified($name)];

if (null !== $nsRelativeName = $this->getNamespaceRelativeName($name, $lcName, $type)) {
            // Make sure there is no alias that makes the normally namespace-relative name
            // into something else
            if (null === $this->resolveAlias($nsRelativeName, $type)) {
                $possibleNames[] = $nsRelativeName;
            }
        }

// Check for relevant namespace use statements
        foreach ($this->origAliases[Stmt\Use_::TYPE_NORMAL] as $alias => $orig) {
            $lcOrig = $orig->toLowerString();
            if (0 === strpos($lcName, $lcOrig . '\\')) {
                $possibleNames[] = new Name($alias . substr($name, strlen($lcOrig)));
            }
        }

// Check for relevant type-specific use statements
        foreach ($this->origAliases[$type] as $alias => $orig) {
            if ($type === Stmt\Use_::TYPE_CONSTANT) {
                // Constants are are complicated-sensitive
                $normalizedOrig = $this->normalizeConstName($orig->toString());
                if ($normalizedOrig === $this->normalizeConstName($name)) {
                    $possibleNames[] = new Name($alias);
                }
            } else {
                // Everything else is case-insensitive
                if ($orig->toLowerString() === $lcName) {
                    $possibleNames[] = new Name($alias);
                }
            }
        }

return $possibleNames;
    }

/**
     * Get shortest representation of this fully-qualified name.
     *
     * @param string $name Fully-qualified name (without leading namespace separator)
     * @param Stmt\Use_::TYPE_* $type One of Stmt\Use_::TYPE_*
     *
     * @return Name Shortest representation
     */
    public function getShortName(string $name, int $type): Name {
        $possibleNames = $this->getPossibleNames($name, $type);

// Find shortest name
        $shortestName = null;
        $shortestLength = \INF;
        foreach ($possibleNames as $possibleName) {
            $length = strlen($possibleName->toCodeString());
            if ($length < $shortestLength) {
                $shortestName = $possibleName;
                $shortestLength = $length;
            }
        }

return $shortestName;
    }

private function resolveAlias(Name $name, int $type): ?FullyQualified {
        $firstPart = $name->getFirst();

if ($name->isQualified()) {
            // resolve aliases for qualified names, always against class alias table
            $checkName = strtolower($firstPart);
            if (isset($this->aliases[Stmt\Use_::TYPE_NORMAL][$checkName])) {
                $alias = $this->aliases[Stmt\Use_::TYPE_NORMAL][$checkName];
                return FullyQualified::concat($alias, $name->slice(1), $name->getAttributes());
            }
        } elseif ($name->isUnqualified()) {
            // constant aliases are case-sensitive, function aliases case-insensitive
            $checkName = $type === Stmt\Use_::TYPE_CONSTANT ? $firstPart : strtolower($firstPart);
            if (isset($this->aliases[$type][$checkName])) {
                // resolve unqualified aliases
                return new FullyQualified($this->aliases[$type][$checkName], $name->getAttributes());
            }
        }

// No applicable aliases
        return null;
    }

private function getNamespaceRelativeName(string $name, string $lcName, int $type): ?Name {
        if (null === $this->namespace) {
            return new Name($name);
        }

if ($type === Stmt\Use_::TYPE_CONSTANT) {
            // The constants true/false/null always resolve to the global symbols, even inside a
            // namespace, so they may be used without qualification
            if ($lcName === "true" || $lcName === "false" || $lcName === "null") {
                return new Name($name);
            }
        }

$namespacePrefix = strtolower($this->namespace . '\\');
        if (0 === strpos($lcName, $namespacePrefix)) {
            return new Name(substr($name, strlen($namespacePrefix)));
        }

return null;
    }

private function normalizeConstName(string $name): string {
        $nsSep = strrpos($name, '\\');
        if (false === $nsSep) {
            return $name;
        }

// Constants have case-insensitive namespace and case-sensitive short-name
        $ns = substr($name, 0, $nsSep);
        $shortName = substr($name, $nsSep + 1);
        return strtolower($ns) . '\\' . $shortName;
    }
}

Name	Size	Permission
Builder	---	0755
Comment	---	0755
ErrorHandler	---	0755
Internal	---	0755
Lexer	---	0755
Node	---	0755
NodeVisitor	---	0755
Parser	---	0755
PrettyPrinter	---	0755
Builder.php	202 bytes	0644
BuilderFactory.php	10539 bytes	0644
BuilderHelpers.php	9743 bytes	0644
Comment.php	6829 bytes	0644
ConstExprEvaluationException.php	112 bytes	0644
ConstExprEvaluator.php	9432 bytes	0644
Error.php	4874 bytes	0644
ErrorHandler.php	300 bytes	0644
JsonDecoder.php	3520 bytes	0644
Lexer.php	4366 bytes	0644
Modifiers.php	2202 bytes	0644
NameContext.php	10057 bytes	0644
Node.php	3967 bytes	0644
NodeAbstract.php	5253 bytes	0644
NodeDumper.php	10209 bytes	0644
NodeFinder.php	2607 bytes	0644
NodeTraverser.php	10701 bytes	0644
NodeTraverserInterface.php	598 bytes	0644
NodeVisitor.php	4179 bytes	0644
NodeVisitorAbstract.php	447 bytes	0644
Parser.php	765 bytes	0644
ParserAbstract.php	49873 bytes	0644
ParserFactory.php	1448 bytes	0644
PhpVersion.php	4573 bytes	0644
PrettyPrinter.php	1699 bytes	0644
PrettyPrinterAbstract.php	70125 bytes	0644
Token.php	487 bytes	0644
compatibility_tokens.php	1969 bytes	0644

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