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XHPASTTree.php
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Mon, Feb 17, 09:52

XHPASTTree.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 XHPASTTree {
protected $tree = array();
protected $stream = array();
public static function newFromData($php_source) {
$future = xhpast_get_parser_future($php_source);
return self::newFromDataAndResolvedExecFuture(
$php_source,
$future->resolve());
}
public static function newFromDataAndResolvedExecFuture(
$php_source,
array $resolved) {
list($err, $stdout, $stderr) = $resolved;
if ($err) {
if ($err == 1) {
$matches = null;
$is_syntax = preg_match(
'/^XHPAST Parse Error: (.*) on line (\d+)/',
$stderr,
$matches);
if ($is_syntax) {
throw new XHPASTSyntaxErrorException($matches[2], $stderr);
}
}
throw new Exception("XHPAST failed to parse file data {$err}: {$stderr}");
}
$data = json_decode($stdout, true);
if (!is_array($data)) {
throw new Exception("XHPAST: failed to decode tree.");
}
return new XHPASTTree($data['tree'], $data['stream'], $php_source);
}
public function __construct(array $tree, array $stream, $source) {
$ii = 0;
$offset = 0;
foreach ($stream as $token) {
$this->stream[$ii] = new XHPASTToken(
$ii,
$token[0],
substr($source, $offset, $token[1]),
$offset,
$this);
$offset += $token[1];
++$ii;
}
$this->buildTree(array($tree));
}
public function getRootNode() {
return $this->tree[0];
}
protected function buildTree(array $tree) {
$ii = count($this->tree);
$nodes = array();
foreach ($tree as $node) {
$this->tree[$ii] = new XHPASTNode($ii, $node, $this);
$nodes[$ii] = $node;
++$ii;
}
foreach ($nodes as $node_id => $node) {
if (isset($node[3])) {
$children = $this->buildTree($node[3]);
foreach ($children as $child) {
$child->setParentNode($this->tree[$node_id]);
}
$this->tree[$node_id]->setChildren($children);
}
}
return array_select_keys($this->tree, array_keys($nodes));
}
public function getRawTokenStream() {
return $this->stream;
}
public function renderAsText() {
return $this->executeRenderAsText(array($this->getRootNode()), 0);
}
protected function executeRenderAsText($list, $depth) {
$return = '';
foreach ($list as $node) {
if ($depth) {
$return .= str_repeat(' ', $depth);
}
$return .= $node->getDescription()."\n";
$return .= $this->executeRenderAsText($node->getChildren(), $depth + 1);
}
return $return;
}
public static function evalStaticString($string) {
$string = '<?php '.rtrim($string, ';').';';
$tree = XHPASTTree::newFromData($string);
$statements = $tree->getRootNode()->selectDescendantsOfType('n_STATEMENT');
if (count($statements) != 1) {
throw new Exception("String does not parse into exactly one statement!");
}
// Return the first one, trying to use reset() with iterators ends in tears.
foreach ($statements as $statement) {
return $statement->evalStatic();
}
}
}

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