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Edit File : UseStatementPass.php \| Size : 4.08 KB
<?php /* * This file is part of Psy Shell. * * (c) 2012-2018 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. / namespace Psy\CodeCleaner; use PhpParser\Node; use PhpParser\Node\Name; use PhpParser\Node\Name\FullyQualified as FullyQualifiedName; use PhpParser\Node\Stmt\GroupUse; use PhpParser\Node\Stmt\Namespace_; use PhpParser\Node\Stmt\Use_; use PhpParser\NodeTraverser; /* * Provide implicit use statements for subsequent execution. * * The use statement pass remembers the last use statement line encountered: * * use Foo\Bar as Baz; * * ... which it then applies implicitly to all future evaluated code, until the * current namespace is replaced by another namespace. / class UseStatementPass extends CodeCleanerPass { private $aliases = []; private $lastAliases = []; private $lastNamespace = null; /* * Re-load the last set of use statements on re-entering a namespace. * * This isn't how namespaces normally work, but because PsySH has to spin * up a new namespace for every line of code, we do this to make things * work like you'd expect. * * @param Node $node / public function enterNode(Node $node) { if ($node instanceof Namespace_) { // If this is the same namespace as last namespace, let's do ourselves // a favor and reload all the aliases... if (\strtolower($node->name) === \strtolower($this->lastNamespace)) { $this->aliases = $this->lastAliases; } } } /* * If this statement is a namespace, forget all the aliases we had. * * If it's a use statement, remember the alias for later. Otherwise, apply * remembered aliases to the code. * * @param Node $node / public function leaveNode(Node $node) { if ($node instanceof Use_) { // Store a reference to every "use" statement, because we'll need // them in a bit. foreach ($node->uses as $use) { $alias = $use->alias ?: \end($use->name->parts); $this->aliases[\strtolower($alias)] = $use->name; } return NodeTraverser::REMOVE_NODE; } elseif ($node instanceof GroupUse) { // Expand every "use" statement in the group into a full, standalone // "use" and store 'em with the others. foreach ($node->uses as $use) { $alias = $use->alias ?: \end($use->name->parts); $this->aliases[\strtolower($alias)] = Name::concat($node->prefix, $use->name, [ 'startLine' => $node->prefix->getAttribute('startLine'), 'endLine' => $use->name->getAttribute('endLine'), ]); } return NodeTraverser::REMOVE_NODE; } elseif ($node instanceof Namespace_) { // Start fresh, since we're done with this namespace. $this->lastNamespace = $node->name; $this->lastAliases = $this->aliases; $this->aliases = []; } else { foreach ($node as $name => $subNode) { if ($subNode instanceof Name) { // Implicitly thunk all aliases. if ($replacement = $this->findAlias($subNode)) { $node->$name = $replacement; } } } return $node; } } /* * Find class/namespace aliases. * * @param Name $name * * @return FullyQualifiedName\|null */ private function findAlias(Name $name) { $that = \strtolower($name); foreach ($this->aliases as $alias => $prefix) { if ($that === $alias) { return new FullyQualifiedName($prefix->toString()); } elseif (\substr($that, 0, \strlen($alias) + 1) === $alias . '\\') { return new FullyQualifiedName($prefix->toString() . \substr($name, \strlen($alias))); } } } } Back

Edit File : UseStatementPass.php | Size : 4.08 KB

<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2018 Justin Hileman
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Psy\CodeCleaner;

use PhpParser\Node;
use PhpParser\Node\Name;
use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
use PhpParser\Node\Stmt\GroupUse;
use PhpParser\Node\Stmt\Namespace_;
use PhpParser\Node\Stmt\Use_;
use PhpParser\NodeTraverser;

/**
 * Provide implicit use statements for subsequent execution.
 *
 * The use statement pass remembers the last use statement line encountered:
 *
 *     use Foo\Bar as Baz;
 *
 * ... which it then applies implicitly to all future evaluated code, until the
 * current namespace is replaced by another namespace.
 */
class UseStatementPass extends CodeCleanerPass
{
    private $aliases       = [];
    private $lastAliases   = [];
    private $lastNamespace = null;

/**
     * Re-load the last set of use statements on re-entering a namespace.
     *
     * This isn't how namespaces normally work, but because PsySH has to spin
     * up a new namespace for every line of code, we do this to make things
     * work like you'd expect.
     *
     * @param Node $node
     */
    public function enterNode(Node $node)
    {
        if ($node instanceof Namespace_) {
            // If this is the same namespace as last namespace, let's do ourselves
            // a favor and reload all the aliases...
            if (\strtolower($node->name) === \strtolower($this->lastNamespace)) {
                $this->aliases = $this->lastAliases;
            }
        }
    }

/**
     * If this statement is a namespace, forget all the aliases we had.
     *
     * If it's a use statement, remember the alias for later. Otherwise, apply
     * remembered aliases to the code.
     *
     * @param Node $node
     */
    public function leaveNode(Node $node)
    {
        if ($node instanceof Use_) {
            // Store a reference to every "use" statement, because we'll need
            // them in a bit.
            foreach ($node->uses as $use) {
                $alias = $use->alias ?: \end($use->name->parts);
                $this->aliases[\strtolower($alias)] = $use->name;
            }

return NodeTraverser::REMOVE_NODE;
        } elseif ($node instanceof GroupUse) {
            // Expand every "use" statement in the group into a full, standalone
            // "use" and store 'em with the others.
            foreach ($node->uses as $use) {
                $alias = $use->alias ?: \end($use->name->parts);
                $this->aliases[\strtolower($alias)] = Name::concat($node->prefix, $use->name, [
                    'startLine' => $node->prefix->getAttribute('startLine'),
                    'endLine'   => $use->name->getAttribute('endLine'),
                ]);
            }

return NodeTraverser::REMOVE_NODE;
        } elseif ($node instanceof Namespace_) {
            // Start fresh, since we're done with this namespace.
            $this->lastNamespace = $node->name;
            $this->lastAliases   = $this->aliases;
            $this->aliases       = [];
        } else {
            foreach ($node as $name => $subNode) {
                if ($subNode instanceof Name) {
                    // Implicitly thunk all aliases.
                    if ($replacement = $this->findAlias($subNode)) {
                        $node->$name = $replacement;
                    }
                }
            }

return $node;
        }
    }

/**
     * Find class/namespace aliases.
     *
     * @param Name $name
     *
     * @return FullyQualifiedName|null
     */
    private function findAlias(Name $name)
    {
        $that = \strtolower($name);
        foreach ($this->aliases as $alias => $prefix) {
            if ($that === $alias) {
                return new FullyQualifiedName($prefix->toString());
            } elseif (\substr($that, 0, \strlen($alias) + 1) === $alias . '\\') {
                return new FullyQualifiedName($prefix->toString() . \substr($name, \strlen($alias)));
            }
        }
    }
}

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