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Edit File : NameContext.php \| Size : 9.69 KB
<?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 $namespace; /* @var Name[][] Map of format [aliasType => [aliasName => originalName]] / protected $aliases = []; /* @var Name[][] Same as $aliases but preserving original case / protected $origAliases = []; /* @var ErrorHandler Error handler / protected $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) { $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 int $type One of Stmt\Use_::TYPE_* * @param array $errorAttrs Attributes to use to report an error / public function addAlias(Name $name, string $aliasName, int $type, array $errorAttrs = []) { // Constant names are case sensitive, everything else case insensitive if ($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() { return $this->namespace; } /* * Get resolved name. * * @param Name $name Name to resolve * @param int $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 $type) { // don't resolve special class names if ($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 int $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 int $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, $type) { $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) { 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) { $nsSep = strrpos($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; } } Back

Edit File : NameContext.php | Size : 9.69 KB

<?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 $namespace;

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

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

/** @var ErrorHandler Error handler */
    protected $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) {
        $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 int    $type        One of Stmt\Use_::TYPE_*
     * @param array  $errorAttrs Attributes to use to report an error
     */
    public function addAlias(Name $name, string $aliasName, int $type, array $errorAttrs = []) {
        // Constant names are case sensitive, everything else case insensitive
        if ($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() {
        return $this->namespace;
    }

/**
     * Get resolved name.
     *
     * @param Name $name Name to resolve
     * @param int  $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 $type) {
        // don't resolve special class names
        if ($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 int    $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 int    $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, $type) {
        $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) {
        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) {
        $nsSep = strrpos($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;
    }
}

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