Version 1

[yaffs-website] / vendor / nikic / php-parser / lib / PhpParser / NodeTraverser.php

diff --git a/vendor/nikic/php-parser/lib/PhpParser/NodeTraverser.php b/vendor/nikic/php-parser/lib/PhpParser/NodeTraverser.php
new file mode 100644 (file)
index 0000000..cce43d9
--- /dev/null
+++ b/vendor/nikic/php-parser/lib/PhpParser/NodeTraverser.php
@@ -0,0 +1,204 @@
+<?php
+
+namespace PhpParser;
+
+class NodeTraverser implements NodeTraverserInterface
+{
+    /**
+     * If NodeVisitor::enterNode() returns DONT_TRAVERSE_CHILDREN, child nodes
+     * of the current node will not be traversed for any visitors.
+     *
+     * For subsequent visitors enterNode() will still be called on the current
+     * node and leaveNode() will also be invoked for the current node.
+     */
+    const DONT_TRAVERSE_CHILDREN = 1;
+
+    /**
+     * If NodeVisitor::enterNode() or NodeVisitor::leaveNode() returns
+     * STOP_TRAVERSAL, traversal is aborted.
+     *
+     * The afterTraverse() method will still be invoked.
+     */
+    const STOP_TRAVERSAL = 2;
+
+    /**
+     * If NodeVisitor::leaveNode() returns REMOVE_NODE for a node that occurs
+     * in an array, it will be removed from the array.
+     *
+     * For subsequent visitors leaveNode() will still be invoked for the
+     * removed node.
+     */
+    const REMOVE_NODE = false;
+
+    /** @var NodeVisitor[] Visitors */
+    protected $visitors;
+
+    /** @var bool Whether traversal should be stopped */
+    protected $stopTraversal;
+
+    /**
+     * Constructs a node traverser.
+     */
+    public function __construct() {
+        $this->visitors = array();
+    }
+
+    /**
+     * Adds a visitor.
+     *
+     * @param NodeVisitor $visitor Visitor to add
+     */
+    public function addVisitor(NodeVisitor $visitor) {
+        $this->visitors[] = $visitor;
+    }
+
+    /**
+     * Removes an added visitor.
+     *
+     * @param NodeVisitor $visitor
+     */
+    public function removeVisitor(NodeVisitor $visitor) {
+        foreach ($this->visitors as $index => $storedVisitor) {
+            if ($storedVisitor === $visitor) {
+                unset($this->visitors[$index]);
+                break;
+            }
+        }
+    }
+
+    /**
+     * Traverses an array of nodes using the registered visitors.
+     *
+     * @param Node[] $nodes Array of nodes
+     *
+     * @return Node[] Traversed array of nodes
+     */
+    public function traverse(array $nodes) {
+        $this->stopTraversal = false;
+
+        foreach ($this->visitors as $visitor) {
+            if (null !== $return = $visitor->beforeTraverse($nodes)) {
+                $nodes = $return;
+            }
+        }
+
+        $nodes = $this->traverseArray($nodes);
+
+        foreach ($this->visitors as $visitor) {
+            if (null !== $return = $visitor->afterTraverse($nodes)) {
+                $nodes = $return;
+            }
+        }
+
+        return $nodes;
+    }
+
+    protected function traverseNode(Node $node) {
+        foreach ($node->getSubNodeNames() as $name) {
+            $subNode =& $node->$name;
+
+            if (is_array($subNode)) {
+                $subNode = $this->traverseArray($subNode);
+                if ($this->stopTraversal) {
+                    break;
+                }
+            } elseif ($subNode instanceof Node) {
+                $traverseChildren = true;
+                foreach ($this->visitors as $visitor) {
+                    $return = $visitor->enterNode($subNode);
+                    if (self::DONT_TRAVERSE_CHILDREN === $return) {
+                        $traverseChildren = false;
+                    } else if (self::STOP_TRAVERSAL === $return) {
+                        $this->stopTraversal = true;
+                        break 2;
+                    } else if (null !== $return) {
+                        $subNode = $return;
+                    }
+                }
+
+                if ($traverseChildren) {
+                    $subNode = $this->traverseNode($subNode);
+                    if ($this->stopTraversal) {
+                        break;
+                    }
+                }
+
+                foreach ($this->visitors as $visitor) {
+                    $return = $visitor->leaveNode($subNode);
+                    if (self::STOP_TRAVERSAL === $return) {
+                        $this->stopTraversal = true;
+                        break 2;
+                    } else if (null !== $return) {
+                        if (is_array($return)) {
+                            throw new \LogicException(
+                                'leaveNode() may only return an array ' .
+                                'if the parent structure is an array'
+                            );
+                        }
+                        $subNode = $return;
+                    }
+                }
+            }
+        }
+
+        return $node;
+    }
+
+    protected function traverseArray(array $nodes) {
+        $doNodes = array();
+
+        foreach ($nodes as $i => &$node) {
+            if (is_array($node)) {
+                $node = $this->traverseArray($node);
+                if ($this->stopTraversal) {
+                    break;
+                }
+            } elseif ($node instanceof Node) {
+                $traverseChildren = true;
+                foreach ($this->visitors as $visitor) {
+                    $return = $visitor->enterNode($node);
+                    if (self::DONT_TRAVERSE_CHILDREN === $return) {
+                        $traverseChildren = false;
+                    } else if (self::STOP_TRAVERSAL === $return) {
+                        $this->stopTraversal = true;
+                        break 2;
+                    } else if (null !== $return) {
+                        $node = $return;
+                    }
+                }
+
+                if ($traverseChildren) {
+                    $node = $this->traverseNode($node);
+                    if ($this->stopTraversal) {
+                        break;
+                    }
+                }
+
+                foreach ($this->visitors as $visitor) {
+                    $return = $visitor->leaveNode($node);
+
+                    if (self::REMOVE_NODE === $return) {
+                        $doNodes[] = array($i, array());
+                        break;
+                    } else if (self::STOP_TRAVERSAL === $return) {
+                        $this->stopTraversal = true;
+                        break 2;
+                    } elseif (is_array($return)) {
+                        $doNodes[] = array($i, $return);
+                        break;
+                    } elseif (null !== $return) {
+                        $node = $return;
+                    }
+                }
+            }
+        }
+
+        if (!empty($doNodes)) {
+            while (list($i, $replace) = array_pop($doNodes)) {
+                array_splice($nodes, $i, 1, $replace);
+            }
+        }
+
+        return $nodes;
+    }
+}