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XHPASTNode.php
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Tue, Jan 7, 03:21

XHPASTNode.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class XHPASTNode {
protected $id;
protected $l;
protected $r;
protected $typeID;
protected $children = array();
protected $tree;
protected $parentNode;
public function __construct($id, array $data, XHPASTTree $tree) {
$this->id = $id;
$this->typeID = $data[0];
$this->l = idx($data, 1, -1);
$this->r = idx($data, 2, -1);
$this->tree = $tree;
}
public function setParentNode($parent_node) {
$this->parentNode = $parent_node;
return $this;
}
public function getParentNode() {
return $this->parentNode;
}
public function setChildren(array $children) {
$this->children = $children;
return $this;
}
public function getID() {
return $this->id;
}
public function getTypeID() {
return $this->typeID;
}
public function getTypeName() {
static $map;
if (empty($map)) {
$map = xhp_parser_node_constants();
}
$type_id = $this->getTypeID();
if (empty($map[$type_id])) {
throw new Exception("No type name for node type ID '{$type_id}'.");
}
return $map[$type_id];
}
public function getChildren() {
return $this->children;
}
public function getChildOfType($index, $type) {
$child = $this->getChildByIndex($index);
if ($child->getTypeName() != $type) {
throw new Exception(
"Child in position '{$index}' is not of type '{$type}': ".
$this->getDescription());
}
return $child;
}
public function getChildByIndex($index) {
$child = idx(array_values($this->children), $index);
if (!$child) {
throw new Exception(
"No child with index '{$index}'.");
}
return $child;
}
public function selectDescendantsOfType($type_name) {
$type = $this->getTypeIDFromTypeName($type_name);
return XHPASTNodeList::newFromTreeAndNodes(
$this->tree,
$this->executeSelectDescendantsOfType($this, $type));
}
protected function executeSelectDescendantsOfType($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('', $values);
}
public function getStringLiteralValue() {
// TODO: This function should accommodate concatenation of literals and
// return 'null' if the literal contains variables.
if ($this->getTypeName() != 'n_STRING_SCALAR') {
return null;
}
$value = $this->getConcreteString();
$value = substr($value, 1, -1);
$value = stripcslashes($value);
return $value;
}
public function getSemanticString() {
$tokens = $this->getTokens();
foreach ($tokens as $id => $token) {
if ($token->isComment()) {
unset($tokens[$id]);
}
}
return implode('', mpull($tokens, 'getValue'));
}
public function getDescription() {
$concrete = $this->getConcreteString();
if (strlen($concrete) > 75) {
$concrete = substr($concrete, 0, 36).'...'.substr($concrete, -36);
}
$concrete = addcslashes($concrete, "\\\n\"");
return 'a node of type '.$this->getTypeName().': "'.$concrete.'"';
}
protected function getTypeIDFromTypeName($type_name) {
static $node_types;
if (empty($node_types)) {
$node_types = xhp_parser_node_constants();
$node_types = array_flip($node_types);
}
if (empty($node_types[$type_name])) {
throw new Exception("Unknown XHPAST Node type name '{$type_name}'!");
}
return $node_types[$type_name];
}
public function getOffset() {
$first_token = idx($this->tree->getRawTokenStream(), $this->l);
if (!$first_token) {
return null;
}
return $first_token->getOffset();
}
public function isStaticScalar() {
return ($this->getTypeName() == 'n_STRING_SCALAR' ||
$this->getTypeName() == 'n_NUMERIC_SCALAR');
}
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, $after);
}
public function getDocblockToken() {
if ($this->l == -1) {
return null;
}
$tokens = $this->tree->getRawTokenStream();
for ($ii = $this->l - 1; $ii >= 0; $ii--) {
if ($tokens[$ii]->getTypeName() == 'T_DOC_COMMENT') {
return $tokens[$ii];
}
if (!$tokens[$ii]->isAnyWhitespace()) {
return null;
}
}
return null;
}
public function evalStatic() {
switch ($this->getTypeName()) {
case 'n_STATEMENT':
return $this->getChildByIndex(0)->evalStatic();
break;
case 'n_STRING_SCALAR':
$value = $this->getSemanticString();
$value = substr($value, 1, -1);
// NOTE: This intentionally treats '$' in strings as a literal dollar
// symbol.
$value = stripcslashes($value);
return (string)$value;
case 'n_NUMERIC_SCALAR':
$value = $this->getSemanticString();
if (preg_match('/^0x/i', $value)) {
// Hex
return (int)base_convert(substr($value, 2), 16, 10);
} else if (preg_match('/^0\d+$/i', $value)) {
// Octal
return (int)base_convert(substr($value, 1), 8, 10);
} else if (preg_match('/^\d+$/', $value)) {
return (int)$value;
} else {
return (double)$value;
}
break;
case 'n_SYMBOL_NAME':
$value = $this->getSemanticString();
if ($value == 'INF') {
return INF;
}
switch (strtolower($value)) {
case 'true':
return true;
case 'false':
return false;
case 'null':
return null;
default:
throw new Exception('Unrecognized symbol name.');
}
break;
case 'n_UNARY_PREFIX_EXPRESSION':
$operator = $this->getChildOfType(0, 'n_OPERATOR');
$operand = $this->getChildByIndex(1);
switch ($operator->getSemanticString()) {
case '-':
return -$operand->evalStatic();
break;
case '+':
return $operand->evalStatic();
break;
default:
throw new Exception("Unexpected operator in static expression.");
}
break;
case 'n_ARRAY_LITERAL':
$result = array();
$values = $this->getChildOfType(0, 'n_ARRAY_VALUE_LIST');
foreach ($values->getChildren() as $child) {
$key = $child->getChildByIndex(0);
$val = $child->getChildByIndex(1);
if ($key->getTypeName() == 'n_EMPTY') {
$result[] = $val->evalStatic();
} else {
$result[$key->evalStatic()] = $val->evalStatic();
}
}
return $result;
default:
throw new Exception("Unexpected node.");
}
}
}

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