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XHPASTTree.php
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Wed, Apr 9, 17:12

XHPASTTree.php
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<?php
/*
* Copyright 2012 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.
*/
/**
* @group xhpast
*/
final class XHPASTTree extends AASTTree {
public function __construct(array $tree, array $stream, $source) {
$this->setTreeType('XHP');
$this->setNodeConstants(xhp_parser_node_constants());
$this->setTokenConstants(xhpast_parser_token_constants());
parent::__construct($tree, $stream, $source);
}
public function newNode($id, array $data, AASTTree $tree) {
return new XHPASTNode($id, $data, $tree);
}
public function newToken(
$id,
$type,
$value,
$offset,
AASTTree $tree) {
return new XHPASTToken($id, $type, $value, $offset, $tree);
}
public static function newFromData($php_source) {
$future = xhpast_get_parser_future($php_source);
return self::newFromDataAndResolvedExecFuture(
$php_source,
$future->resolve());
}
public static function evalStaticString($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();
}
}
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);
}
}

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