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AASTNode.php
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Fri, Feb 7, 10:44

AASTNode.php
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<?php
abstract class AASTNode extends Phobject {
private $id;
protected $l;
protected $r;
private $typeID;
private $typeName;
protected $tree;
private $children = array();
private $parentNode = null;
private $previousSibling = null;
private $nextSibling = null;
private $selectCache;
private $tokenCache;
abstract public function isStaticScalar();
abstract public function getDocblockToken();
abstract public function evalStatic();
abstract public function getStringLiteralValue();
public function __construct($id, array $data, AASTTree $tree) {
$this->id = $id;
$this->typeID = $data[0];
if (isset($data[1])) {
$this->l = $data[1];
} else {
$this->l = -1;
}
if (isset($data[2])) {
$this->r = $data[2];
} else {
$this->r = -1;
}
$this->tree = $tree;
}
final public function getParentNode() {
return $this->parentNode;
}
final public function setParentNode(AASTNode $node = null) {
$this->parentNode = $node;
return $this;
}
final public function getPreviousSibling() {
return $this->previousSibling;
}
final public function setPreviousSibling(AASTNode $node = null) {
$this->previousSibling = $node;
return $this;
}
final public function getNextSibling() {
return $this->nextSibling;
}
final public function setNextSibling(AASTNode $node = null) {
$this->nextSibling = $node;
return $this;
}
final public function getID() {
return $this->id;
}
final public function getTypeID() {
return $this->typeID;
}
final public function getTree() {
return $this->tree;
}
final public function getTypeName() {
if (empty($this->typeName)) {
$this->typeName =
$this->tree->getNodeTypeNameFromTypeID($this->getTypeID());
}
return $this->typeName;
}
final public function getChildren() {
return $this->children;
}
final public function setChildren(array $children) {
// We don't call `assert_instances_of($children, 'AASTNode')` because doing
// so would incur a significant performance penalty.
$this->children = $children;
return $this;
}
public function getChildrenOfType($type) {
$nodes = array();
foreach ($this->children as $child) {
if ($child->getTypeName() == $type) {
$nodes[] = $child;
}
}
return $nodes;
}
public function getChildOfType($index, $type) {
$child = $this->getChildByIndex($index);
if ($child->getTypeName() != $type) {
throw new Exception(
pht(
"Child in position '%d' is not of type '%s': %s",
$index,
$type,
$this->getDescription()));
}
return $child;
}
public function getChildByIndex($index) {
// NOTE: Microoptimization to avoid calls like array_values() or idx().
$idx = 0;
foreach ($this->children as $child) {
if ($idx == $index) {
return $child;
}
++$idx;
}
throw new Exception(pht("No child with index '%d'.", $index));
}
/**
* Build a cache to improve the performance of
* @{method:selectDescendantsOfType}. This cache makes a time/memory tradeoff
* by aggressively caching node descendants. It may improve the tree's query
* performance substantially if you make a large number of queries, but also
* requires a significant amount of memory.
*
* This builds a cache for the entire tree and improves performance of all
* @{method:selectDescendantsOfType} calls.
*/
public function buildSelectCache() {
$cache = array();
foreach ($this->getChildren() as $id => $child) {
$type_id = $child->getTypeID();
if (empty($cache[$type_id])) {
$cache[$type_id] = array();
}
$cache[$type_id][$id] = $child;
foreach ($child->buildSelectCache() as $type_id => $nodes) {
if (empty($cache[$type_id])) {
$cache[$type_id] = array();
}
$cache[$type_id] += $nodes;
}
}
$this->selectCache = $cache;
return $this->selectCache;
}
/**
* Build a cache to improve the performance of @{method:selectTokensOfType}.
* This cache makes a time/memory tradeoff by aggressively caching token
* types. It may improve the tree's query performance substantially if you
* make a large number of queries, but also requires a significant amount of
* memory.
*
* This builds a cache for this node only.
*/
public function buildTokenCache() {
$cache = array();
foreach ($this->getTokens() as $id => $token) {
$cache[$token->getTypeName()][$id] = $token;
}
$this->tokenCache = $cache;
return $this->tokenCache;
}
public function selectTokensOfType($type_name) {
return $this->selectTokensOfTypes(array($type_name));
}
/**
* Select all tokens of any given types.
*/
public function selectTokensOfTypes(array $type_names) {
$tokens = array();
foreach ($type_names as $type_name) {
if (isset($this->tokenCache)) {
$cached_tokens = idx($this->tokenCache, $type_name, array());
foreach ($cached_tokens as $id => $cached_token) {
$tokens[$id] = $cached_token;
}
} else {
foreach ($this->getTokens() as $id => $token) {
if ($token->getTypeName() == $type_name) {
$tokens[$id] = $token;
}
}
}
}
return $tokens;
}
final public function isDescendantOf(AASTNode $node) {
for ($it = $this; $it !== null; $it = $it->getParentNode()) {
if ($it === $node) {
return true;
}
}
return false;
}
public function selectDescendantsOfType($type_name) {
return $this->selectDescendantsOfTypes(array($type_name));
}
public function selectDescendantsOfTypes(array $type_names) {
$nodes = array();
foreach ($type_names as $type_name) {
$type = $this->getTypeIDFromTypeName($type_name);
if (isset($this->selectCache)) {
if (isset($this->selectCache[$type])) {
$nodes = $nodes + $this->selectCache[$type];
}
} else {
$nodes = $nodes + $this->executeSelectDescendantsOfType($this, $type);
}
}
return AASTNodeList::newFromTreeAndNodes($this->tree, $nodes);
}
protected function executeSelectDescendantsOfType($node, $type) {
$results = array();
foreach ($node->getChildren() as $id => $child) {
if ($child->getTypeID() == $type) {
$results[$id] = $child;
}
$results += $this->executeSelectDescendantsOfType($child, $type);
}
return $results;
}
public function getTokens() {
if ($this->l == -1 || $this->r == -1) {
return array();
}
$tokens = $this->tree->getRawTokenStream();
$result = array();
foreach (range($this->l, $this->r) as $token_id) {
$result[$token_id] = $tokens[$token_id];
}
return $result;
}
public function getConcreteString() {
$values = array();
foreach ($this->getTokens() as $token) {
$values[] = $token->getValue();
}
return implode('', $values);
}
public function getSemanticString() {
$tokens = $this->getTokens();
foreach ($tokens as $id => $token) {
if ($token->isComment()) {
unset($tokens[$id]);
}
}
return implode('', mpull($tokens, 'getValue'));
}
public function getIndentation() {
$tokens = $this->getTokens();
$left = head($tokens);
while ($left &&
(!$left->isAnyWhitespace() ||
strpos($left->getValue(), "\n") === false)) {
$left = $left->getPrevToken();
}
if (!$left) {
return null;
}
return preg_replace("/^.*\n/s", '', $left->getValue());
}
public function getDescription() {
$concrete = $this->getConcreteString();
if (strlen($concrete) > 75) {
$concrete = substr($concrete, 0, 36).'...'.substr($concrete, -36);
}
$concrete = addcslashes($concrete, "\\\n\"");
return pht('a node of type %s: "%s"', $this->getTypeName(), $concrete);
}
final protected function getTypeIDFromTypeName($type_name) {
return $this->tree->getNodeTypeIDFromTypeName($type_name);
}
final public function getOffset() {
$stream = $this->tree->getRawTokenStream();
if (empty($stream[$this->l])) {
return null;
}
return $stream[$this->l]->getOffset();
}
final public function getLength() {
$stream = $this->tree->getRawTokenStream();
if (empty($stream[$this->r])) {
return null;
}
return $stream[$this->r]->getOffset() - $this->getOffset();
}
public function getSurroundingNonsemanticTokens() {
$before = array();
$after = array();
$tokens = $this->tree->getRawTokenStream();
if ($this->l != -1) {
$before = $tokens[$this->l]->getNonsemanticTokensBefore();
}
if ($this->r != -1) {
$after = $tokens[$this->r]->getNonsemanticTokensAfter();
}
return array($before, $after);
}
final public function getLineNumber() {
return idx($this->tree->getOffsetToLineNumberMap(), $this->getOffset());
}
final public function getEndLineNumber() {
return idx(
$this->tree->getOffsetToLineNumberMap(),
$this->getOffset() + $this->getLength());
}
/**
* Determines whether the current node appears //after// a specified node in
* the tree.
*
* @param AASTNode
* @return bool
*/
final public function isAfter(AASTNode $node) {
return head($this->getTokens())->getOffset() >
last($node->getTokens())->getOffset();
}
/**
* Determines whether the current node appears //before// a specified node in
* the tree.
*
* @param AASTNode
* @return bool
*/
final public function isBefore(AASTNode $node) {
return last($this->getTokens())->getOffset() <
head($node->getTokens())->getOffset();
}
/**
* Determines whether a specified node is a descendant of the current node.
*
* @param AASTNode
* @return bool
*/
final public function containsDescendant(AASTNode $node) {
return !$this->isAfter($node) && !$this->isBefore($node);
}
public function dispose() {
foreach ($this->getChildren() as $child) {
$child->dispose();
}
unset($this->selectCache);
}
}

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