mirror of
https://github.com/danog/psalm.git
synced 2024-12-13 09:47:29 +01:00
265 lines
8.7 KiB
PHP
265 lines
8.7 KiB
PHP
<?php
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namespace Psalm\Checker;
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use PhpParser;
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class ScopeChecker
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{
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const ACTION_END = 'END';
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const ACTION_BREAK = 'BREAK';
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const ACTION_CONTINUE = 'CONTINUE';
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const ACTION_NONE = 'NONE';
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const ACTION_RETURN = 'RETURN';
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/**
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* @param array<PhpParser\Node\Stmt> $stmts
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*
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* @return bool
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*/
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public static function doesEverBreak(array $stmts)
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{
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if (empty($stmts)) {
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return false;
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}
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for ($i = count($stmts) - 1; $i >= 0; --$i) {
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$stmt = $stmts[$i];
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if ($stmt instanceof PhpParser\Node\Stmt\Break_) {
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return true;
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}
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if ($stmt instanceof PhpParser\Node\Stmt\If_) {
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if (self::doesEverBreak($stmt->stmts)) {
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return true;
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}
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if ($stmt->else && self::doesEverBreak($stmt->else->stmts)) {
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return true;
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}
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foreach ($stmt->elseifs as $elseif) {
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if (self::doesEverBreak($elseif->stmts)) {
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return true;
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}
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}
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}
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}
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return false;
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}
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/**
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* @param array<PhpParser\Node> $stmts
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* @param bool $continue_is_break when checking inside a switch statement, continue is an alias of break
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* @param bool $return_is_exit Exit and Throw statements are treated differently from return if this is false
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*
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* @return string[] one or more of 'LEAVE', 'CONTINUE', 'BREAK' (or empty if no single action is found)
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*/
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public static function getFinalControlActions(
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array $stmts,
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$continue_is_break = false,
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$return_is_exit = true
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) {
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if (empty($stmts)) {
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return [self::ACTION_NONE];
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}
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$control_actions = [];
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for ($i = 0, $c = count($stmts); $i < $c; ++$i) {
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$stmt = $stmts[$i];
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if ($stmt instanceof PhpParser\Node\Stmt\Return_ ||
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$stmt instanceof PhpParser\Node\Stmt\Throw_ ||
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($stmt instanceof PhpParser\Node\Stmt\Expression && $stmt->expr instanceof PhpParser\Node\Expr\Exit_)
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) {
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if (!$return_is_exit && $stmt instanceof PhpParser\Node\Stmt\Return_) {
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return [self::ACTION_RETURN];
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}
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return [self::ACTION_END];
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}
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if ($stmt instanceof PhpParser\Node\Stmt\Continue_) {
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if ($continue_is_break
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&& (!$stmt->num || !$stmt->num instanceof PhpParser\Node\Scalar\LNumber || $stmt->num->value < 2)
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) {
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return [self::ACTION_BREAK];
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}
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return [self::ACTION_CONTINUE];
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}
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if ($stmt instanceof PhpParser\Node\Stmt\Break_) {
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return [self::ACTION_BREAK];
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}
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if ($stmt instanceof PhpParser\Node\Stmt\If_) {
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$if_statement_actions = self::getFinalControlActions($stmt->stmts, $continue_is_break);
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$else_statement_actions = $stmt->else
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? self::getFinalControlActions($stmt->else->stmts, $continue_is_break)
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: [];
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$all_same = count($if_statement_actions) === 1
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&& $if_statement_actions == $else_statement_actions
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&& $if_statement_actions !== [self::ACTION_NONE];
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$all_elseif_actions = [];
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if ($stmt->elseifs) {
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foreach ($stmt->elseifs as $elseif) {
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$elseif_control_actions = self::getFinalControlActions($elseif->stmts, $continue_is_break);
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$all_same = $all_same && $elseif_control_actions == $if_statement_actions;
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if (!$all_same) {
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$all_elseif_actions = array_merge($elseif_control_actions, $all_elseif_actions);
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}
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}
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}
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if ($all_same) {
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return $if_statement_actions;
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}
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$control_actions = array_merge(
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$control_actions,
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$if_statement_actions,
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$else_statement_actions,
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$all_elseif_actions
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);
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}
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if ($stmt instanceof PhpParser\Node\Stmt\Switch_) {
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$has_ended = false;
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$has_non_breaking_default = false;
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$has_default_terminator = false;
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// iterate backwards in a case statement
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for ($d = count($stmt->cases) - 1; $d >= 0; --$d) {
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$case = $stmt->cases[$d];
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$case_actions = self::getFinalControlActions($case->stmts, true);
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if (array_intersect([self::ACTION_BREAK, self::ACTION_CONTINUE], $case_actions)) {
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// clear out any default breaking notions
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$has_non_breaking_default = false;
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continue 2;
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}
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if (!$case->cond) {
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$has_non_breaking_default = true;
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}
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$case_does_end = $case_actions == [self::ACTION_END];
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if ($case_does_end) {
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$has_ended = true;
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}
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if (!$case_does_end && !$has_ended) {
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continue 2;
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}
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if ($has_non_breaking_default && $case_does_end) {
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$has_default_terminator = true;
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}
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}
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if ($has_default_terminator || isset($stmt->allMatched)) {
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return [self::ACTION_END];
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}
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}
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if ($stmt instanceof PhpParser\Node\Stmt\While_) {
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$control_actions = array_merge(self::getFinalControlActions($stmt->stmts), $control_actions);
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}
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if ($stmt instanceof PhpParser\Node\Stmt\Do_) {
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$do_actions = self::getFinalControlActions($stmt->stmts);
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if (count($do_actions) && !in_array(self::ACTION_NONE, $do_actions, true)) {
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return $do_actions;
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}
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$control_actions = array_merge($control_actions, $do_actions);
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}
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if ($stmt instanceof PhpParser\Node\Stmt\TryCatch) {
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$try_statement_actions = self::getFinalControlActions($stmt->stmts, $continue_is_break);
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if ($stmt->catches) {
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$all_same = count($try_statement_actions) === 1;
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foreach ($stmt->catches as $catch) {
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$catch_actions = self::getFinalControlActions($catch->stmts, $continue_is_break);
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$all_same = $all_same && $try_statement_actions == $catch_actions;
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if (!$all_same) {
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$control_actions = array_merge($control_actions, $catch_actions);
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}
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}
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if ($all_same && $try_statement_actions !== [self::ACTION_NONE]) {
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return $try_statement_actions;
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}
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}
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if ($stmt->finally) {
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if ($stmt->finally->stmts) {
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$finally_statement_actions = self::getFinalControlActions(
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$stmt->finally->stmts,
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$continue_is_break
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);
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if (!in_array(self::ACTION_NONE, $finally_statement_actions, true)) {
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return $finally_statement_actions;
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}
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}
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if (!$stmt->catches && !in_array(self::ACTION_NONE, $try_statement_actions, true)) {
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return $try_statement_actions;
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}
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}
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$control_actions = array_merge($control_actions, $try_statement_actions);
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}
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}
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$control_actions[] = self::ACTION_NONE;
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return array_unique($control_actions);
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}
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/**
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* @param array<PhpParser\Node> $stmts
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*
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* @return bool
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*/
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public static function onlyThrows(array $stmts)
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{
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if (empty($stmts)) {
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return false;
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}
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for ($i = count($stmts) - 1; $i >= 0; --$i) {
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$stmt = $stmts[$i];
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if ($stmt instanceof PhpParser\Node\Stmt\Throw_) {
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return true;
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}
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if ($stmt instanceof PhpParser\Node\Stmt\Nop) {
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continue;
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}
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return false;
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}
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return false;
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}
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}
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