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FunctionLikeDocblockParser.php
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<?php
namespace Psalm\Internal\PhpVisitor\Reflector;
use PhpParser;
use Psalm\DocComment;
use Psalm\Exception\DocblockParseException;
use Psalm\Exception\IncorrectDocblockException;
use Psalm\Internal\Analyzer\CommentAnalyzer;
use Psalm\Internal\Scanner\FunctionDocblockComment;
use Psalm\Internal\Scanner\ParsedDocblock;
use function array_shift;
use function array_unique;
use function count;
use function explode;
use function implode;
use function in_array;
use function preg_match;
use function preg_replace;
use function preg_split;
use function reset;
use function str_replace;
use function stripos;
use function strlen;
use function strpos;
use function strtolower;
use function substr;
use function substr_count;
use function trim;
class FunctionLikeDocblockParser
{
/**
* @throws DocblockParseException if there was a problem parsing the docblock
*/
public static function parse(PhpParser\Comment\Doc $comment): FunctionDocblockComment
{
$parsed_docblock = DocComment::parsePreservingLength($comment);
$comment_text = $comment->getText();
$info = new FunctionDocblockComment();
self::checkDuplicatedTags($parsed_docblock);
self::checkUnexpectedTags($parsed_docblock, $info, $comment);
if (isset($parsed_docblock->combined_tags['return'])) {
self::extractReturnType(
$comment,
$parsed_docblock->combined_tags['return'],
$info
);
}
if (isset($parsed_docblock->combined_tags['param'])) {
foreach ($parsed_docblock->combined_tags['param'] as $offset => $param) {
$line_parts = CommentAnalyzer::splitDocLine($param);
if (count($line_parts) === 1 && isset($line_parts[0][0]) && $line_parts[0][0] === '$') {
continue;
}
if (count($line_parts) > 1) {
if (preg_match('/^&?(\.\.\.)?&?\$[A-Za-z0-9_]+,?$/', $line_parts[1])
&& ($line_parts[0] === '' || $line_parts[0][0] !== '{')
) {
$line_parts[1] = str_replace('&', '', $line_parts[1]);
$line_parts[1] = preg_replace('/,$/', '', $line_parts[1]);
$end = $offset + strlen($line_parts[0]);
$line_parts[0] = CommentAnalyzer::sanitizeDocblockType($line_parts[0]);
if ($line_parts[0] === ''
|| ($line_parts[0][0] === '$'
&& !preg_match('/^\$this(\||$)/', $line_parts[0]))
) {
throw new IncorrectDocblockException('Misplaced variable');
}
$info_param = [
'name' => trim($line_parts[1]),
'type' => $line_parts[0],
'line_number' => $comment->getStartLine() + substr_count(
$comment_text,
"\n",
0,
$offset - $comment->getStartFilePos()
),
'start' => $offset,
'end' => $end,
];
if (isset($line_parts[1]) && isset($line_parts[2])) {
$description = substr($param, strlen($line_parts[0]) + strlen($line_parts[1]) + 2);
$info_param['description'] = trim($description);
// Handle multiline description.
$info_param['description'] = preg_replace(
'/\\n \\*\\s+/um',
' ',
$info_param['description']
);
}
$info->params[] = $info_param;
}
} else {
throw new DocblockParseException('Badly-formatted @param');
}
}
}
if (isset($parsed_docblock->combined_tags['param-out'])) {
foreach ($parsed_docblock->combined_tags['param-out'] as $offset => $param) {
$line_parts = CommentAnalyzer::splitDocLine($param);
if (count($line_parts) === 1 && isset($line_parts[0][0]) && $line_parts[0][0] === '$') {
continue;
}
if (count($line_parts) > 1) {
if (!preg_match('/\[[^\]]+\]/', $line_parts[0])
&& preg_match('/^(\.\.\.)?&?\$[A-Za-z0-9_]+,?$/', $line_parts[1])
&& $line_parts[0][0] !== '{'
) {
if ($line_parts[1][0] === '&') {
$line_parts[1] = substr($line_parts[1], 1);
}
$line_parts[0] = str_replace("\n", '', preg_replace('@^[ \t]*\*@m', '', $line_parts[0]));
if ($line_parts[0] === ''
|| ($line_parts[0][0] === '$'
&& !preg_match('/^\$this(\||$)/', $line_parts[0]))
) {
throw new IncorrectDocblockException('Misplaced variable');
}
$line_parts[1] = preg_replace('/,$/', '', $line_parts[1]);
$info->params_out[] = [
'name' => trim($line_parts[1]),
'type' => str_replace("\n", '', $line_parts[0]),
'line_number' => $comment->getStartLine() + substr_count(
$comment_text,
"\n",
0,
$offset - $comment->getStartFilePos()
),
];
}
} else {
throw new DocblockParseException('Badly-formatted @param');
}
}
}
foreach (['psalm-self-out', 'psalm-this-out'] as $alias) {
if (isset($parsed_docblock->tags[$alias])) {
foreach ($parsed_docblock->tags[$alias] as $offset => $param) {
$line_parts = CommentAnalyzer::splitDocLine($param);
if (count($line_parts) > 0) {
$line_parts[0] = str_replace("\n", '', preg_replace('@^[ \t]*\*@m', '', $line_parts[0]));
$info->self_out = [
'type' => str_replace("\n", '', $line_parts[0]),
'line_number' => $comment->getStartLine() + substr_count(
$comment_text,
"\n",
0,
$offset - $comment->getStartFilePos()
),
];
}
}
break;
}
}
if (isset($parsed_docblock->tags['psalm-flow'])) {
foreach ($parsed_docblock->tags['psalm-flow'] as $param) {
$info->flows[] = trim($param);
}
}
if (isset($parsed_docblock->tags['psalm-if-this-is'])) {
foreach ($parsed_docblock->tags['psalm-if-this-is'] as $offset => $param) {
$line_parts = CommentAnalyzer::splitDocLine($param);
$line_parts[0] = str_replace("\n", '', preg_replace('@^[ \t]*\*@m', '', $line_parts[0]));
$info->if_this_is = [
'type' => str_replace("\n", '', $line_parts[0]),
'line_number' => $comment->getStartLine() + substr_count(
$comment->getText(),
"\n",
0,
$offset - $comment->getStartFilePos()
),
];
}
}
if (isset($parsed_docblock->tags['psalm-taint-sink'])) {
foreach ($parsed_docblock->tags['psalm-taint-sink'] as $param) {
$param_parts = preg_split('/\s+/', trim($param));
if (count($param_parts) >= 2) {
$info->taint_sink_params[] = ['name' => $param_parts[1], 'taint' => $param_parts[0]];
}
}
}
// support for MediaWiki taint plugin
if (isset($parsed_docblock->tags['param-taint'])) {
foreach ($parsed_docblock->tags['param-taint'] as $param) {
$param_parts = preg_split('/\s+/', trim($param));
if (count($param_parts) === 2) {
$taint_type = $param_parts[1];
if (strpos($taint_type, 'exec_') === 0) {
$taint_type = substr($taint_type, 5);
if ($taint_type === 'tainted') {
$taint_type = 'input';
}
if ($taint_type === 'misc') {
$taint_type = 'text';
}
$info->taint_sink_params[] = ['name' => $param_parts[0], 'taint' => $taint_type];
}
}
}
}
if (isset($parsed_docblock->tags['psalm-taint-source'])) {
foreach ($parsed_docblock->tags['psalm-taint-source'] as $param) {
$param_parts = preg_split('/\s+/', trim($param));
if ($param_parts[0]) {
$info->taint_source_types[] = $param_parts[0];
}
}
} elseif (isset($parsed_docblock->tags['return-taint'])) {
// support for MediaWiki taint plugin
foreach ($parsed_docblock->tags['return-taint'] as $param) {
$param_parts = preg_split('/\s+/', trim($param));
if ($param_parts[0]) {
if ($param_parts[0] === 'tainted') {
$param_parts[0] = 'input';
}
if ($param_parts[0] === 'misc') {
$param_parts[0] = 'text';
}
if ($param_parts[0] !== 'none') {
$info->taint_source_types[] = $param_parts[0];
}
}
}
}
if (isset($parsed_docblock->tags['psalm-taint-unescape'])) {
foreach ($parsed_docblock->tags['psalm-taint-unescape'] as $param) {
$param = trim($param);
$info->added_taints[] = $param;
}
}
if (isset($parsed_docblock->tags['psalm-taint-escape'])) {
foreach ($parsed_docblock->tags['psalm-taint-escape'] as $param) {
$param = trim($param);
if ($param[0] === '(') {
$line_parts = CommentAnalyzer::splitDocLine($param);
$info->removed_taints[] = CommentAnalyzer::sanitizeDocblockType($line_parts[0]);
} else {
$info->removed_taints[] = explode(' ', $param)[0];
}
}
}
if (isset($parsed_docblock->tags['psalm-assert-untainted'])) {
foreach ($parsed_docblock->tags['psalm-assert-untainted'] as $param) {
$param = trim($param);
$info->assert_untainted_params[] = ['name' => $param];
}
}
if (isset($parsed_docblock->tags['psalm-taint-specialize'])) {
$info->specialize_call = true;
}
if (isset($parsed_docblock->tags['global'])) {
foreach ($parsed_docblock->tags['global'] as $offset => $global) {
$line_parts = CommentAnalyzer::splitDocLine($global);
if (count($line_parts) === 1 && isset($line_parts[0][0]) && $line_parts[0][0] === '$') {
continue;
}
if (count($line_parts) > 1) {
if (!preg_match('/\[[^\]]+\]/', $line_parts[0])
&& preg_match('/^(\.\.\.)?&?\$[A-Za-z0-9_]+,?$/', $line_parts[1])
&& $line_parts[0][0] !== '{'
) {
if ($line_parts[1][0] === '&') {
$line_parts[1] = substr($line_parts[1], 1);
}
if ($line_parts[0][0] === '$' && !preg_match('/^\$this(\||$)/', $line_parts[0])) {
throw new IncorrectDocblockException('Misplaced variable');
}
$line_parts[1] = preg_replace('/,$/', '', $line_parts[1]);
$info->globals[] = [
'name' => $line_parts[1],
'type' => $line_parts[0],
'line_number' => $comment->getStartLine() + substr_count(
$comment_text,
"\n",
0,
$offset - $comment->getStartFilePos()
),
];
}
} else {
throw new DocblockParseException('Badly-formatted @param');
}
}
}
if (isset($parsed_docblock->tags['since'])) {
$since = trim(reset($parsed_docblock->tags['since']));
if (preg_match('/^[4578]\.\d(\.\d+)?$/', $since)) {
$since_parts = explode('.', $since);
$info->since_php_major_version = (int)$since_parts[0];
$info->since_php_minor_version = (int)$since_parts[1];
}
}
if (isset($parsed_docblock->tags['deprecated'])) {
$info->deprecated = true;
}
if (isset($parsed_docblock->tags['internal'])) {
$info->internal = true;
}
if (isset($parsed_docblock->tags['psalm-internal'])) {
$psalm_internal = reset($parsed_docblock->tags['psalm-internal']);
if ($psalm_internal) {
$info->psalm_internal = $psalm_internal;
} else {
throw new DocblockParseException('@psalm-internal annotation used without specifying namespace');
}
$info->psalm_internal = reset($parsed_docblock->tags['psalm-internal']);
$info->internal = true;
}
if (isset($parsed_docblock->tags['psalm-suppress'])) {
foreach ($parsed_docblock->tags['psalm-suppress'] as $offset => $suppress_entry) {
foreach (DocComment::parseSuppressList($suppress_entry) as $issue_offset => $suppressed_issue) {
$info->suppressed_issues[$issue_offset + $offset] = $suppressed_issue;
}
}
}
if (isset($parsed_docblock->tags['throws'])) {
foreach ($parsed_docblock->tags['throws'] as $offset => $throws_entry) {
$throws_class = preg_split('/[\s]+/', $throws_entry)[0];
if (!$throws_class) {
throw new IncorrectDocblockException('Unexpectedly empty @throws');
}
$info->throws[] = [
$throws_class,
$offset,
$comment->getStartLine() + substr_count(
$comment->getText(),
"\n",
0,
$offset - $comment->getStartFilePos()
)
];
}
}
if (stripos($parsed_docblock->description, '@inheritdoc') !== false
|| isset($parsed_docblock->tags['inheritdoc'])
|| isset($parsed_docblock->tags['inheritDoc'])
) {
$info->inheritdoc = true;
}
$templates = [];
if (isset($parsed_docblock->combined_tags['template'])) {
foreach ($parsed_docblock->combined_tags['template'] as $offset => $template_line) {
$template_type = preg_split('/[\s]+/', preg_replace('@^[ \t]*\*@m', '', $template_line));
$template_name = array_shift($template_type);
if (!$template_name) {
throw new IncorrectDocblockException('Empty @template tag');
}
$source_prefix = 'none';
if (isset($parsed_docblock->tags['psalm-template'][$offset])) {
$source_prefix = 'psalm';
} elseif (isset($parsed_docblock->tags['phpstan-template'][$offset])) {
$source_prefix = 'phpstan';
}
if (count($template_type) > 1
&& in_array(strtolower($template_type[0]), ['as', 'super', 'of'], true)
) {
$template_modifier = strtolower(array_shift($template_type));
$templates[$template_name][$source_prefix] = [
$template_name,
$template_modifier,
implode(' ', $template_type),
false
];
} else {
$templates[$template_name][$source_prefix] = [$template_name, null, null, false];
}
}
}
foreach ($templates as $template_entries) {
foreach (['psalm', 'phpstan', 'none'] as $source_prefix) {
if (isset($template_entries[$source_prefix])) {
$info->templates[] = $template_entries[$source_prefix];
break;
}
}
}
if (isset($parsed_docblock->tags['psalm-assert'])) {
foreach ($parsed_docblock->tags['psalm-assert'] as $assertion) {
$line_parts = self::sanitizeAssertionLineParts(CommentAnalyzer::splitDocLine($assertion));
$info->assertions[] = [
'type' => $line_parts[0],
'param_name' => $line_parts[1][0] === '$' ? substr($line_parts[1], 1) : $line_parts[1],
];
}
}
if (isset($parsed_docblock->tags['psalm-assert-if-true'])) {
foreach ($parsed_docblock->tags['psalm-assert-if-true'] as $assertion) {
$line_parts = self::sanitizeAssertionLineParts(CommentAnalyzer::splitDocLine($assertion));
$info->if_true_assertions[] = [
'type' => $line_parts[0],
'param_name' => $line_parts[1][0] === '$' ? substr($line_parts[1], 1) : $line_parts[1],
];
}
}
if (isset($parsed_docblock->tags['psalm-assert-if-false'])) {
foreach ($parsed_docblock->tags['psalm-assert-if-false'] as $assertion) {
$line_parts = self::sanitizeAssertionLineParts(CommentAnalyzer::splitDocLine($assertion));
$info->if_false_assertions[] = [
'type' => $line_parts[0],
'param_name' => $line_parts[1][0] === '$' ? substr($line_parts[1], 1) : $line_parts[1],
];
}
}
$info->variadic = isset($parsed_docblock->tags['psalm-variadic']);
$info->pure = isset($parsed_docblock->tags['psalm-pure'])
|| isset($parsed_docblock->tags['pure']);
if (isset($parsed_docblock->tags['psalm-mutation-free'])) {
$info->mutation_free = true;
}
if (isset($parsed_docblock->tags['psalm-external-mutation-free'])) {
$info->external_mutation_free = true;
}
if (isset($parsed_docblock->tags['no-named-arguments'])) {
$info->no_named_args = true;
}
$info->ignore_nullable_return = isset($parsed_docblock->tags['psalm-ignore-nullable-return']);
$info->ignore_falsable_return = isset($parsed_docblock->tags['psalm-ignore-falsable-return']);
$info->stub_override = isset($parsed_docblock->tags['psalm-stub-override']);
if (!empty($parsed_docblock->description)) {
$info->description = $parsed_docblock->description;
}
return $info;
}
/**
* @psalm-pure
* @param list<string> $line_parts
* @return array{string, string} $line_parts
*/
private static function sanitizeAssertionLineParts(array $line_parts): array
{
if (count($line_parts) < 2 || strpos($line_parts[1], '$') === false) {
throw new IncorrectDocblockException('Misplaced variable');
}
$line_parts[0] = CommentAnalyzer::sanitizeDocblockType($line_parts[0]);
if ($line_parts[1][0] === '$') {
$param_name_parts = explode('->', $line_parts[1]);
foreach ($param_name_parts as $i => $param_name_part) {
if (substr($param_name_part, -2) === '()') {
$param_name_parts[$i] = strtolower($param_name_part);
}
}
$line_parts[1] = implode('->', $param_name_parts);
}
return $line_parts;
}
/**
* @param array<int, string> $return_specials
*/
private static function extractReturnType(
PhpParser\Comment\Doc $comment,
array $return_specials,
FunctionDocblockComment $info
): void {
foreach ($return_specials as $offset => $return_block) {
$return_lines = explode("\n", $return_block);
if (trim($return_lines[0]) === '') {
return;
}
$return_block = trim($return_block);
if ($return_block === '') {
return;
}
$line_parts = CommentAnalyzer::splitDocLine($return_block);
if ($line_parts[0][0] !== '{') {
if ($line_parts[0][0] === '$' && !preg_match('/^\$this(\||$)/', $line_parts[0])) {
throw new IncorrectDocblockException('Misplaced variable');
}
$end = $offset + strlen($line_parts[0]);
$line_parts[0] = CommentAnalyzer::sanitizeDocblockType($line_parts[0]);
$info->return_type = array_shift($line_parts);
$info->return_type_description = $line_parts ? implode(' ', $line_parts) : null;
$info->return_type_line_number
= $comment->getStartLine() + substr_count(
$comment->getText(),
"\n",
0,
$offset - $comment->getStartFilePos()
);
$info->return_type_start = $offset;
$info->return_type_end = $end;
} else {
throw new DocblockParseException('Badly-formatted @return type');
}
break;
}
}
/**
* @throws DocblockParseException if a duplicate is found
*/
private static function checkDuplicatedTags(ParsedDocblock $parsed_docblock): void
{
if (count($parsed_docblock->tags['return'] ?? []) > 1
|| count($parsed_docblock->tags['psalm-return'] ?? []) > 1
|| count($parsed_docblock->tags['phpstan-return'] ?? []) > 1
) {
throw new DocblockParseException('Found duplicated @return or prefixed @return tag');
}
self::checkDuplicatedParams($parsed_docblock->tags['param'] ?? []);
self::checkDuplicatedParams($parsed_docblock->tags['psalm-param'] ?? []);
self::checkDuplicatedParams($parsed_docblock->tags['phpstan-param'] ?? []);
}
/**
* @param array<int, string> $param
*
*
* @throws DocblockParseException if a duplicate is found
*/
private static function checkDuplicatedParams(array $param): void
{
$list_names = self::extractAllParamNames($param);
if (count($list_names) !== count(array_unique($list_names))) {
throw new DocblockParseException('Found duplicated @param or prefixed @param tag');
}
}
/**
* @param array<int, string> $lines
*
* @return list<string>
*
* @psalm-pure
*/
private static function extractAllParamNames(array $lines): array
{
$names = [];
foreach ($lines as $line) {
$split_by_dollar = explode('$', $line, 2);
if (count($split_by_dollar) > 1) {
$split_by_space = explode(' ', $split_by_dollar[1], 2);
$names[] = $split_by_space[0];
}
}
return $names;
}
private static function checkUnexpectedTags(
ParsedDocblock $parsed_docblock,
FunctionDocblockComment $info,
PhpParser\Comment\Doc $comment
): void {
if (isset($parsed_docblock->tags['psalm-import-type'])) {
foreach ($parsed_docblock->tags['psalm-import-type'] as $offset => $_) {
$info->unexpected_tags['psalm-import-type']['lines'][] = self::docblockLineNumber($comment, $offset);
}
}
if (isset($parsed_docblock->combined_tags['var'])) {
$info->unexpected_tags['var'] = ['lines' => [], 'suggested_replacement' => 'param'];
foreach ($parsed_docblock->combined_tags['var'] as $offset => $_) {
$info->unexpected_tags['var']['lines'][] = self::docblockLineNumber($comment, $offset);
}
}
}
private static function docblockLineNumber(PhpParser\Comment\Doc $comment, int $offset): int
{
return $comment->getStartLine() + substr_count(
$comment->getText(),
"\n",
0,
$offset - $comment->getStartFilePos()
);
}
}