<?php

/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *     Dariusz Rumiński <dariusz.ruminski@gmail.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace PhpCsFixer\Fixer\Basic;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\Fixer\ConfigurationDefinitionFixerInterface;
use PhpCsFixer\Fixer\WhitespacesAwareFixerInterface;
use PhpCsFixer\FixerConfiguration\FixerConfigurationResolver;
use PhpCsFixer\FixerConfiguration\FixerOptionBuilder;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;

/**
 * Fixer for rules defined in PSR2 ¶4.1, ¶4.4, ¶5.
 *
 * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
 */
final class BracesFixer extends AbstractFixer implements ConfigurationDefinitionFixerInterface, WhitespacesAwareFixerInterface
{
    /**
     * @internal
     */
    const LINE_NEXT = 'next';

    /**
     * @internal
     */
    const LINE_SAME = 'same';

    /**
     * {@inheritdoc}
     */
    public function getDefinition()
    {
        return new FixerDefinition(
            'The body of each structure MUST be enclosed by braces. Braces should be properly placed. Body of braces should be properly indented.',
            [
                new CodeSample(
'<?php

class Foo {
    public function bar($baz) {
        if ($baz = 900) echo "Hello!";

        if ($baz = 9000)
            echo "Wait!";

        if ($baz == true)
        {
            echo "Why?";
        }
        else
        {
            echo "Ha?";
        }

        if (is_array($baz))
            foreach ($baz as $b)
            {
                echo $b;
            }
    }
}
'
                ),
                new CodeSample(
'<?php
$positive = function ($item) { return $item >= 0; };
$negative = function ($item) {
                return $item < 0; };
',
                    ['allow_single_line_closure' => true]
                ),
                new CodeSample(
'<?php

class Foo
{
    public function bar($baz)
    {
        if ($baz = 900) echo "Hello!";

        if ($baz = 9000)
            echo "Wait!";

        if ($baz == true)
        {
            echo "Why?";
        }
        else
        {
            echo "Ha?";
        }

        if (is_array($baz))
            foreach ($baz as $b)
            {
                echo $b;
            }
    }
}
',
                    ['position_after_functions_and_oop_constructs' => self::LINE_SAME]
                ),
            ]
        );
    }

    /**
     * {@inheritdoc}
     */
    public function getPriority()
    {
        // should be run after the ElseIfFixer, NoEmptyStatementFixer and NoUselessElseFixer
        return -25;
    }

    /**
     * {@inheritdoc}
     */
    public function isCandidate(Tokens $tokens)
    {
        return true;
    }

    /**
     * {@inheritdoc}
     */
    protected function applyFix(\SplFileInfo $file, Tokens $tokens)
    {
        $this->fixCommentBeforeBrace($tokens);
        $this->fixMissingControlBraces($tokens);
        $this->fixIndents($tokens);
        $this->fixControlContinuationBraces($tokens);
        $this->fixSpaceAroundToken($tokens);
        $this->fixDoWhile($tokens);
    }

    /**
     * {@inheritdoc}
     */
    protected function createConfigurationDefinition()
    {
        return new FixerConfigurationResolver([
            (new FixerOptionBuilder('allow_single_line_closure', 'Whether single line lambda notation should be allowed.'))
                ->setAllowedTypes(['bool'])
                ->setDefault(false)
                ->getOption(),
            (new FixerOptionBuilder('position_after_functions_and_oop_constructs', 'whether the opening brace should be placed on "next" or "same" line after classy constructs (non-anonymous classes, interfaces, traits, methods and non-lambda functions).'))
                ->setAllowedValues([self::LINE_NEXT, self::LINE_SAME])
                ->setDefault(self::LINE_NEXT)
                ->getOption(),
            (new FixerOptionBuilder('position_after_control_structures', 'whether the opening brace should be placed on "next" or "same" line after control structures.'))
                ->setAllowedValues([self::LINE_NEXT, self::LINE_SAME])
                ->setDefault(self::LINE_SAME)
                ->getOption(),
            (new FixerOptionBuilder('position_after_anonymous_constructs', 'whether the opening brace should be placed on "next" or "same" line after anonymous constructs (anonymous classes and lambda functions).'))
                ->setAllowedValues([self::LINE_NEXT, self::LINE_SAME])
                ->setDefault(self::LINE_SAME)
                ->getOption(),
        ]);
    }

    private function fixCommentBeforeBrace(Tokens $tokens)
    {
        $tokensAnalyzer = new TokensAnalyzer($tokens);
        $controlTokens = $this->getControlTokens();

        for ($index = $tokens->count() - 1; 0 <= $index; --$index) {
            $token = $tokens[$index];

            if ($token->isGivenKind($controlTokens)) {
                $prevIndex = $this->findParenthesisEnd($tokens, $index);
            } elseif (
                ($token->isGivenKind(T_FUNCTION) && $tokensAnalyzer->isLambda($index)) ||
                ($token->isGivenKind(T_CLASS) && $tokensAnalyzer->isAnonymousClass($index))
            ) {
                $prevIndex = $tokens->getNextTokenOfKind($index, ['{']);
                $prevIndex = $tokens->getPrevMeaningfulToken($prevIndex);
            } else {
                continue;
            }

            $commentIndex = $tokens->getNextNonWhitespace($prevIndex);
            $commentToken = $tokens[$commentIndex];

            if (!$commentToken->isGivenKind(T_COMMENT) || 0 === strpos($commentToken->getContent(), '/*')) {
                continue;
            }

            $braceIndex = $tokens->getNextMeaningfulToken($commentIndex);
            $braceToken = $tokens[$braceIndex];

            if (!$braceToken->equals('{')) {
                continue;
            }

            $tokenTmp = $tokens[$braceIndex];

            $newBraceIndex = $prevIndex + 1;
            for ($i = $braceIndex; $i > $newBraceIndex; --$i) {
                // we might be moving one white space next to another, these have to be merged
                $tokens[$i] = $tokens[$i - 1];
                if ($tokens[$i]->isWhitespace() && $tokens[$i + 1]->isWhitespace()) {
                    $tokens[$i] = new Token([T_WHITESPACE, $tokens[$i]->getContent().$tokens[$i + 1]->getContent()]);
                    $tokens->clearAt($i + 1);
                }
            }

            $tokens[$newBraceIndex] = $tokenTmp;
            $c = $tokens[$braceIndex]->getContent();
            if (substr_count($c, "\n") > 1) {
                // left trim till last line break
                $tokens[$braceIndex] = new Token([T_WHITESPACE, substr($c, strrpos($c, "\n"))]);
            }
        }
    }

    private function fixControlContinuationBraces(Tokens $tokens)
    {
        $controlContinuationTokens = $this->getControlContinuationTokens();

        for ($index = \count($tokens) - 1; 0 <= $index; --$index) {
            $token = $tokens[$index];

            if (!$token->isGivenKind($controlContinuationTokens)) {
                continue;
            }

            $prevIndex = $tokens->getPrevNonWhitespace($index);
            $prevToken = $tokens[$prevIndex];

            if (!$prevToken->equals('}')) {
                continue;
            }

            $tokens->ensureWhitespaceAtIndex(
                $index - 1,
                1,
                self::LINE_NEXT === $this->configuration['position_after_control_structures'] ?
                    $this->whitespacesConfig->getLineEnding().$this->detectIndent($tokens, $index)
                    : ' '
            );
        }
    }

    private function fixDoWhile(Tokens $tokens)
    {
        for ($index = \count($tokens) - 1; 0 <= $index; --$index) {
            $token = $tokens[$index];

            if (!$token->isGivenKind(T_DO)) {
                continue;
            }

            $parenthesisEndIndex = $this->findParenthesisEnd($tokens, $index);
            $startBraceIndex = $tokens->getNextNonWhitespace($parenthesisEndIndex);
            $endBraceIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $startBraceIndex);
            $nextNonWhitespaceIndex = $tokens->getNextNonWhitespace($endBraceIndex);
            $nextNonWhitespaceToken = $tokens[$nextNonWhitespaceIndex];

            if (!$nextNonWhitespaceToken->isGivenKind(T_WHILE)) {
                continue;
            }

            $tokens->ensureWhitespaceAtIndex($nextNonWhitespaceIndex - 1, 1, ' ');
        }
    }

    private function fixIndents(Tokens $tokens)
    {
        $classyTokens = Token::getClassyTokenKinds();
        $classyAndFunctionTokens = array_merge([T_FUNCTION], $classyTokens);
        $controlTokens = $this->getControlTokens();
        $indentTokens = array_filter(
            array_merge($classyAndFunctionTokens, $controlTokens),
            static function ($item) {
                return T_SWITCH !== $item;
            }
        );
        $tokensAnalyzer = new TokensAnalyzer($tokens);

        for ($index = 0, $limit = \count($tokens); $index < $limit; ++$index) {
            $token = $tokens[$index];

            // if token is not a structure element - continue
            if (!$token->isGivenKind($indentTokens)) {
                continue;
            }

            // do not change indent for `while` in `do ... while ...`
            if (
                $token->isGivenKind(T_WHILE)
                && $tokensAnalyzer->isWhilePartOfDoWhile($index)
            ) {
                continue;
            }

            if (
                $this->configuration['allow_single_line_closure']
                && $token->isGivenKind(T_FUNCTION)
                && $tokensAnalyzer->isLambda($index)
            ) {
                $braceEndIndex = $tokens->findBlockEnd(
                    Tokens::BLOCK_TYPE_CURLY_BRACE,
                    $tokens->getNextTokenOfKind($index, ['{'])
                );

                if (!$this->isMultilined($tokens, $index, $braceEndIndex)) {
                    $index = $braceEndIndex;

                    continue;
                }
            }

            if ($token->isGivenKind($classyAndFunctionTokens)) {
                $startBraceIndex = $tokens->getNextTokenOfKind($index, [';', '{']);
                $startBraceToken = $tokens[$startBraceIndex];
            } else {
                $parenthesisEndIndex = $this->findParenthesisEnd($tokens, $index);
                $startBraceIndex = $tokens->getNextNonWhitespace($parenthesisEndIndex);
                $startBraceToken = $tokens[$startBraceIndex];
            }

            // structure without braces block - nothing to do, e.g. do { } while (true);
            if (!$startBraceToken->equals('{')) {
                continue;
            }

            $endBraceIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $startBraceIndex);

            $indent = $this->detectIndent($tokens, $index);

            // fix indent near closing brace
            $tokens->ensureWhitespaceAtIndex($endBraceIndex - 1, 1, $this->whitespacesConfig->getLineEnding().$indent);

            // fix indent between braces
            $lastCommaIndex = $tokens->getPrevTokenOfKind($endBraceIndex - 1, [';', '}']);

            $nestLevel = 1;
            for ($nestIndex = $lastCommaIndex; $nestIndex >= $startBraceIndex; --$nestIndex) {
                $nestToken = $tokens[$nestIndex];

                if ($nestToken->equalsAny([')', [CT::T_BRACE_CLASS_INSTANTIATION_CLOSE]])) {
                    $nestIndex = $tokens->findBlockStart(
                        $nestToken->equals(')') ? Tokens::BLOCK_TYPE_PARENTHESIS_BRACE : Tokens::BLOCK_TYPE_BRACE_CLASS_INSTANTIATION,
                        $nestIndex
                    );

                    continue;
                }

                if (1 === $nestLevel) {
                    // Next token is the beginning of a line that can be indented when
                    // the current token is a `;`, a `}` or the opening `{` of current
                    // scope. Current token may also be a comment that follows `;` or
                    // `}`, in which case indentation will only be fixed if this
                    // comment is followed by a newline.
                    $nextLineCanBeIndented = false;
                    if ($nestToken->equalsAny([';', '}'])) {
                        $nextLineCanBeIndented = true;
                    } elseif ($this->isCommentWithFixableIndentation($tokens, $nestIndex)) {
                        for ($i = $nestIndex; $i > $startBraceIndex; --$i) {
                            if ($tokens[$i]->equalsAny([';', '}'])) {
                                $nextLineCanBeIndented = true;

                                break;
                            }

                            if (!$tokens[$i]->isWhitespace() && !$tokens[$i]->isComment()) {
                                break;
                            }
                        }

                        if ($nextLineCanBeIndented || $i === $startBraceIndex) {
                            $nextToken = $tokens[$nestIndex + 1];
                            $nextLineCanBeIndented = $nextToken->isWhitespace() && 1 === Preg::match('/\R/', $nextToken->getContent());
                        }
                    }

                    if (!$nextLineCanBeIndented) {
                        continue;
                    }

                    $nextNonWhitespaceNestIndex = $tokens->getNextNonWhitespace($nestIndex);
                    $nextNonWhitespaceNestToken = $tokens[$nextNonWhitespaceNestIndex];

                    if (
                        // next Token is not a comment on its own line
                        !($nextNonWhitespaceNestToken->isComment() && (
                            !$tokens[$nextNonWhitespaceNestIndex - 1]->isWhitespace()
                            || !Preg::match('/\R/', $tokens[$nextNonWhitespaceNestIndex - 1]->getContent())
                        )) &&
                        // and it is not a `$foo = function () {};` situation
                        !($nestToken->equals('}') && $nextNonWhitespaceNestToken->equalsAny([';', ',', ']', [CT::T_ARRAY_SQUARE_BRACE_CLOSE]])) &&
                        // and it is not a `Foo::{bar}()` situation
                        !($nestToken->equals('}') && $nextNonWhitespaceNestToken->equals('(')) &&
                        // and it is not a `${"a"}->...` and `${"b{$foo}"}->...` situation
                        !($nestToken->equals('}') && $tokens[$nestIndex - 1]->equalsAny(['"', "'", [T_CONSTANT_ENCAPSED_STRING]])) &&
                        // and next token is not a closing tag that would break heredoc/nowdoc syntax
                        !($tokens[$nestIndex - 1]->isGivenKind(T_END_HEREDOC) && $nextNonWhitespaceNestToken->isGivenKind(T_CLOSE_TAG))
                    ) {
                        if (
                            (
                                self::LINE_NEXT !== $this->configuration['position_after_control_structures']
                                && $nextNonWhitespaceNestToken->isGivenKind($this->getControlContinuationTokens())
                                && !$tokens[$tokens->getPrevNonWhitespace($nextNonWhitespaceNestIndex)]->isComment()
                            )
                            || $nextNonWhitespaceNestToken->isGivenKind(T_CLOSE_TAG)
                            || (
                                self::LINE_NEXT !== $this->configuration['position_after_control_structures']
                                && $nextNonWhitespaceNestToken->isGivenKind(T_WHILE)
                                && $tokensAnalyzer->isWhilePartOfDoWhile($nextNonWhitespaceNestIndex)
                            )
                        ) {
                            $whitespace = ' ';
                        } else {
                            $nextToken = $tokens[$nestIndex + 1];
                            $nextWhitespace = '';

                            if ($nextToken->isWhitespace()) {
                                $nextWhitespace = rtrim($nextToken->getContent(), " \t");

                                if ('' !== $nextWhitespace) {
                                    $nextWhitespace = Preg::replace(
                                        sprintf('/%s$/', $this->whitespacesConfig->getLineEnding()),
                                        '',
                                        $nextWhitespace,
                                        1
                                    );
                                }
                            }

                            $whitespace = $nextWhitespace.$this->whitespacesConfig->getLineEnding().$indent;

                            if (!$nextNonWhitespaceNestToken->equals('}')) {
                                $determineIsIndentableBlockContent = function ($contentIndex) use ($tokens) {
                                    if (!$tokens[$contentIndex]->isComment()) {
                                        return true;
                                    }

                                    if (!$tokens[$tokens->getPrevMeaningfulToken($contentIndex)]->equals(';')) {
                                        return true;
                                    }

                                    $nextIndex = $tokens->getNextMeaningfulToken($contentIndex);

                                    if (!$tokens[$nextIndex]->equals('}')) {
                                        return true;
                                    }

                                    $nextNextIndex = $tokens->getNextMeaningfulToken($nextIndex);

                                    if (null === $nextNextIndex) {
                                        return true;
                                    }

                                    if ($tokens[$nextNextIndex]->equalsAny([
                                        [T_ELSE],
                                        [T_ELSEIF],
                                        ',',
                                    ])) {
                                        return false;
                                    }

                                    return true;
                                };

                                // add extra indent only if current content is not a comment for content outside of current block
                                if ($determineIsIndentableBlockContent($nestIndex + 2)) {
                                    $whitespace .= $this->whitespacesConfig->getIndent();
                                }
                            }
                        }

                        $this->ensureWhitespaceAtIndexAndIndentMultilineComment($tokens, $nestIndex + 1, $whitespace);
                    }
                }

                if ($nestToken->equals('}')) {
                    ++$nestLevel;

                    continue;
                }

                if ($nestToken->equals('{')) {
                    --$nestLevel;

                    continue;
                }
            }

            // fix indent near opening brace
            if (isset($tokens[$startBraceIndex + 2]) && $tokens[$startBraceIndex + 2]->equals('}')) {
                $tokens->ensureWhitespaceAtIndex($startBraceIndex + 1, 0, $this->whitespacesConfig->getLineEnding().$indent);
            } else {
                $nextToken = $tokens[$startBraceIndex + 1];
                $nextNonWhitespaceToken = $tokens[$tokens->getNextNonWhitespace($startBraceIndex)];

                // set indent only if it is not a case, when comment is following { on same line
                if (
                    !$nextNonWhitespaceToken->isComment()
                    || ($nextToken->isWhitespace() && 1 === substr_count($nextToken->getContent(), "\n")) // preserve blank lines
                ) {
                    $this->ensureWhitespaceAtIndexAndIndentMultilineComment(
                        $tokens,
                        $startBraceIndex + 1,
                        $this->whitespacesConfig->getLineEnding().$indent.$this->whitespacesConfig->getIndent()
                    );
                }
            }

            if ($token->isGivenKind($classyTokens) && !$tokensAnalyzer->isAnonymousClass($index)) {
                if (self::LINE_SAME === $this->configuration['position_after_functions_and_oop_constructs'] && !$tokens[$tokens->getPrevNonWhitespace($startBraceIndex)]->isComment()) {
                    $ensuredWhitespace = ' ';
                } else {
                    $ensuredWhitespace = $this->whitespacesConfig->getLineEnding().$indent;
                }

                $tokens->ensureWhitespaceAtIndex($startBraceIndex - 1, 1, $ensuredWhitespace);
            } elseif (
                $token->isGivenKind(T_FUNCTION) && !$tokensAnalyzer->isLambda($index)
                || (
                    self::LINE_NEXT === $this->configuration['position_after_control_structures'] && $token->isGivenKind($controlTokens)
                    || (
                        self::LINE_NEXT === $this->configuration['position_after_anonymous_constructs']
                        && (
                            $token->isGivenKind(T_FUNCTION) && $tokensAnalyzer->isLambda($index)
                            || $token->isGivenKind(T_CLASS) && $tokensAnalyzer->isAnonymousClass($index)
                        )
                    )
                )
            ) {
                $isAnonymousClass = $token->isGivenKind($classyTokens) && $tokensAnalyzer->isAnonymousClass($index);

                $closingParenthesisIndex = $tokens->getPrevTokenOfKind($startBraceIndex, [')']);
                if (null === $closingParenthesisIndex && !$isAnonymousClass) {
                    continue;
                }

                if (!$isAnonymousClass) {
                    $prevToken = $tokens[$closingParenthesisIndex - 1];
                }

                if (!$isAnonymousClass && $prevToken->isWhitespace() && false !== strpos($prevToken->getContent(), "\n")) {
                    if (!$tokens[$startBraceIndex - 2]->isComment()) {
                        $tokens->ensureWhitespaceAtIndex($startBraceIndex - 1, 1, ' ');
                    }
                } else {
                    if (
                        self::LINE_SAME === $this->configuration['position_after_functions_and_oop_constructs']
                        && (
                            $token->isGivenKind(T_FUNCTION) && !$tokensAnalyzer->isLambda($index)
                            || $token->isGivenKind($classyTokens) && !$tokensAnalyzer->isAnonymousClass($index)
                        )
                        && !$tokens[$tokens->getPrevNonWhitespace($startBraceIndex)]->isComment()
                    ) {
                        $ensuredWhitespace = ' ';
                    } else {
                        $ensuredWhitespace = $this->whitespacesConfig->getLineEnding().$indent;
                    }

                    $tokens->ensureWhitespaceAtIndex($startBraceIndex - 1, 1, $ensuredWhitespace);
                }
            } else {
                $tokens->ensureWhitespaceAtIndex($startBraceIndex - 1, 1, ' ');
            }

            // reset loop limit due to collection change
            $limit = \count($tokens);
        }
    }

    private function fixMissingControlBraces(Tokens $tokens)
    {
        $controlTokens = $this->getControlTokens();

        for ($index = $tokens->count() - 1; 0 <= $index; --$index) {
            $token = $tokens[$index];

            if (!$token->isGivenKind($controlTokens)) {
                continue;
            }

            $parenthesisEndIndex = $this->findParenthesisEnd($tokens, $index);
            $tokenAfterParenthesis = $tokens[$tokens->getNextMeaningfulToken($parenthesisEndIndex)];

            // if Token after parenthesis is { then we do not need to insert brace, but to fix whitespace before it
            if ($tokenAfterParenthesis->equals('{') && self::LINE_SAME === $this->configuration['position_after_control_structures']) {
                $tokens->ensureWhitespaceAtIndex($parenthesisEndIndex + 1, 0, ' ');

                continue;
            }

            // do not add braces for cases:
            // - structure without block, e.g. while ($iter->next());
            // - structure with block, e.g. while ($i) {...}, while ($i) : {...} endwhile;
            if ($tokenAfterParenthesis->equalsAny([';', '{', ':'])) {
                continue;
            }

            $statementEndIndex = $this->findStatementEnd($tokens, $parenthesisEndIndex);

            // insert closing brace
            $tokens->insertAt($statementEndIndex + 1, [new Token([T_WHITESPACE, ' ']), new Token('}')]);

            // insert missing `;` if needed
            if (!$tokens[$statementEndIndex]->equalsAny([';', '}'])) {
                $tokens->insertAt($statementEndIndex + 1, new Token(';'));
            }

            // insert opening brace
            $tokens->insertAt($parenthesisEndIndex + 1, new Token('{'));
            $tokens->ensureWhitespaceAtIndex($parenthesisEndIndex + 1, 0, ' ');
        }
    }

    private function fixSpaceAroundToken(Tokens $tokens)
    {
        $controlTokens = $this->getControlTokens();

        for ($index = $tokens->count() - 1; 0 <= $index; --$index) {
            $token = $tokens[$index];

            // Declare tokens don't follow the same rules are other control statements
            if ($token->isGivenKind(T_DECLARE)) {
                $this->fixDeclareStatement($tokens, $index);
            } elseif ($token->isGivenKind($controlTokens) || $token->isGivenKind(CT::T_USE_LAMBDA)) {
                $nextNonWhitespaceIndex = $tokens->getNextNonWhitespace($index);

                if (!$tokens[$nextNonWhitespaceIndex]->equals(':')) {
                    $tokens->ensureWhitespaceAtIndex(
                        $index + 1,
                        0,
                        self::LINE_NEXT === $this->configuration['position_after_control_structures'] && !$tokens[$nextNonWhitespaceIndex]->equals('(') ?
                            $this->whitespacesConfig->getLineEnding().$this->detectIndent($tokens, $index)
                            : ' '
                    );
                }

                $prevToken = $tokens[$index - 1];

                if (!$prevToken->isWhitespace() && !$prevToken->isComment() && !$prevToken->isGivenKind(T_OPEN_TAG)) {
                    $tokens->ensureWhitespaceAtIndex($index - 1, 1, ' ');
                }
            }
        }
    }

    /**
     * @param Tokens $tokens
     * @param int    $index
     *
     * @return string
     */
    private function detectIndent(Tokens $tokens, $index)
    {
        while (true) {
            $whitespaceIndex = $tokens->getPrevTokenOfKind($index, [[T_WHITESPACE]]);

            if (null === $whitespaceIndex) {
                return '';
            }

            $whitespaceToken = $tokens[$whitespaceIndex];

            if (false !== strpos($whitespaceToken->getContent(), "\n")) {
                break;
            }

            $prevToken = $tokens[$whitespaceIndex - 1];

            if ($prevToken->isGivenKind([T_OPEN_TAG, T_COMMENT]) && "\n" === substr($prevToken->getContent(), -1)) {
                break;
            }

            $index = $whitespaceIndex;
        }

        $explodedContent = explode("\n", $whitespaceToken->getContent());

        return end($explodedContent);
    }

    /**
     * @param Tokens $tokens
     * @param int    $structureTokenIndex
     *
     * @return int
     */
    private function findParenthesisEnd(Tokens $tokens, $structureTokenIndex)
    {
        $nextIndex = $tokens->getNextMeaningfulToken($structureTokenIndex);
        $nextToken = $tokens[$nextIndex];

        // return if next token is not opening parenthesis
        if (!$nextToken->equals('(')) {
            return $structureTokenIndex;
        }

        return $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $nextIndex);
    }

    /**
     * @param Tokens $tokens
     * @param int    $parenthesisEndIndex
     *
     * @return int
     */
    private function findStatementEnd(Tokens $tokens, $parenthesisEndIndex)
    {
        $nextIndex = $tokens->getNextMeaningfulToken($parenthesisEndIndex);
        $nextToken = $tokens[$nextIndex];

        if (!$nextToken) {
            return $parenthesisEndIndex;
        }

        if ($nextToken->equals('{')) {
            return $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $nextIndex);
        }

        if ($nextToken->isGivenKind($this->getControlTokens())) {
            $parenthesisEndIndex = $this->findParenthesisEnd($tokens, $nextIndex);

            $endIndex = $this->findStatementEnd($tokens, $parenthesisEndIndex);

            if ($nextToken->isGivenKind([T_IF, T_TRY, T_DO])) {
                $openingTokenKind = $nextToken->getId();

                while (true) {
                    $nextIndex = $tokens->getNextMeaningfulToken($endIndex);
                    $nextToken = isset($nextIndex) ? $tokens[$nextIndex] : null;
                    if ($nextToken && $nextToken->isGivenKind($this->getControlContinuationTokensForOpeningToken($openingTokenKind))) {
                        $parenthesisEndIndex = $this->findParenthesisEnd($tokens, $nextIndex);

                        $endIndex = $this->findStatementEnd($tokens, $parenthesisEndIndex);

                        if ($nextToken->isGivenKind($this->getFinalControlContinuationTokensForOpeningToken($openingTokenKind))) {
                            return $endIndex;
                        }
                    } else {
                        break;
                    }
                }
            }

            return $endIndex;
        }

        $index = $parenthesisEndIndex;

        while (true) {
            $token = $tokens[++$index];

            // if there is some block in statement (eg lambda function) we need to skip it
            if ($token->equals('{')) {
                $index = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $index);

                continue;
            }

            if ($token->equals(';')) {
                return $index;
            }

            if ($token->isGivenKind(T_CLOSE_TAG)) {
                return $tokens->getPrevNonWhitespace($index);
            }
        }

        throw new \RuntimeException('Statement end not found.');
    }

    private function getControlTokens()
    {
        static $tokens = [
            T_DECLARE,
            T_DO,
            T_ELSE,
            T_ELSEIF,
            T_FINALLY,
            T_FOR,
            T_FOREACH,
            T_IF,
            T_WHILE,
            T_TRY,
            T_CATCH,
            T_SWITCH,
        ];

        return $tokens;
    }

    private function getControlContinuationTokens()
    {
        static $tokens = [
            T_CATCH,
            T_ELSE,
            T_ELSEIF,
            T_FINALLY,
        ];

        return $tokens;
    }

    private function getControlContinuationTokensForOpeningToken($openingTokenKind)
    {
        if (T_IF === $openingTokenKind) {
            return [
                T_ELSE,
                T_ELSEIF,
            ];
        }

        if (T_DO === $openingTokenKind) {
            return [T_WHILE];
        }

        if (T_TRY === $openingTokenKind) {
            return [
                T_CATCH,
                T_FINALLY,
            ];
        }

        return [];
    }

    private function getFinalControlContinuationTokensForOpeningToken($openingTokenKind)
    {
        if (T_IF === $openingTokenKind) {
            return [T_ELSE];
        }

        if (T_TRY === $openingTokenKind) {
            return [T_FINALLY];
        }

        return [];
    }

    /**
     * @param Tokens $tokens
     * @param int    $index
     */
    private function fixDeclareStatement(Tokens $tokens, $index)
    {
        $tokens->removeTrailingWhitespace($index);

        $startParenthesisIndex = $tokens->getNextTokenOfKind($index, ['(']);
        $tokens->removeTrailingWhitespace($startParenthesisIndex);

        $endParenthesisIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $startParenthesisIndex);
        $tokens->removeLeadingWhitespace($endParenthesisIndex);

        $startBraceIndex = $tokens->getNextTokenOfKind($endParenthesisIndex, [';', '{']);
        $startBraceToken = $tokens[$startBraceIndex];

        if ($startBraceToken->equals('{')) {
            $this->fixSingleLineWhitespaceForDeclare($tokens, $startBraceIndex);
        }
    }

    /**
     * @param Tokens $tokens
     * @param int    $startBraceIndex
     */
    private function fixSingleLineWhitespaceForDeclare(Tokens $tokens, $startBraceIndex)
    {
        // fix single-line whitespace before {
        // eg: `declare(ticks=1){` => `declare(ticks=1) {`
        // eg: `declare(ticks=1)   {` => `declare(ticks=1) {`
        if (
            !$tokens[$startBraceIndex - 1]->isWhitespace() ||
            $tokens[$startBraceIndex - 1]->isWhitespace(" \t")
        ) {
            $tokens->ensureWhitespaceAtIndex($startBraceIndex - 1, 1, ' ');
        }
    }

    /**
     * @param Tokens $tokens
     * @param int    $index
     * @param string $whitespace
     */
    private function ensureWhitespaceAtIndexAndIndentMultilineComment(Tokens $tokens, $index, $whitespace)
    {
        if ($tokens[$index]->isWhitespace()) {
            $nextTokenIndex = $tokens->getNextNonWhitespace($index);
        } else {
            $nextTokenIndex = $index;
        }

        $nextToken = $tokens[$nextTokenIndex];
        if ($nextToken->isComment()) {
            $previousToken = $tokens[$nextTokenIndex - 1];

            // do not indent inline comments used to comment out unused code
            if (
                (0 === strpos($nextToken->getContent(), '//'.$this->whitespacesConfig->getIndent()) || '//' === $nextToken->getContent())
                && $previousToken->isWhitespace() && 1 === Preg::match('/\R$/', $previousToken->getContent())
            ) {
                return;
            }

            $tokens[$nextTokenIndex] = new Token([
                $nextToken->getId(),
                Preg::replace(
                    '/(\R)'.$this->detectIndent($tokens, $nextTokenIndex).'/',
                    '$1'.Preg::replace('/^.*\R([ \t]*)$/s', '$1', $whitespace),
                    $nextToken->getContent()
                ),
            ]);
        }

        $tokens->ensureWhitespaceAtIndex($index, 0, $whitespace);
    }

    /**
     * @param Tokens $tokens
     * @param int    $startParenthesisIndex
     * @param int    $endParenthesisIndex
     *
     * @return bool
     */
    private function isMultilined(Tokens $tokens, $startParenthesisIndex, $endParenthesisIndex)
    {
        for ($i = $startParenthesisIndex; $i < $endParenthesisIndex; ++$i) {
            if (false !== strpos($tokens[$i]->getContent(), "\n")) {
                return true;
            }
        }

        return false;
    }

    /**
     * Returns whether the token at given index is a comment whose indentation
     * can be fixed.
     *
     * Indentation of a comment is not changed when the comment is part of a
     * multi-line message whose lines are all single-line comments and at least
     * one line has meaningful content.
     *
     * @param Tokens $tokens
     * @param int    $index
     *
     * @return bool
     */
    private function isCommentWithFixableIndentation(Tokens $tokens, $index)
    {
        if (!$tokens[$index]->isComment()) {
            return false;
        }

        if (0 === strpos($tokens[$index]->getContent(), '/*')) {
            return true;
        }

        $firstCommentIndex = $index;
        while (true) {
            $i = $this->getSiblingContinuousSingleLineComment($tokens, $firstCommentIndex, false);
            if (null === $i) {
                break;
            }

            $firstCommentIndex = $i;
        }

        $lastCommentIndex = $index;
        while (true) {
            $i = $this->getSiblingContinuousSingleLineComment($tokens, $lastCommentIndex, true);
            if (null === $i) {
                break;
            }

            $lastCommentIndex = $i;
        }

        if ($firstCommentIndex === $lastCommentIndex) {
            return true;
        }

        for ($i = $firstCommentIndex + 1; $i < $lastCommentIndex; ++$i) {
            if (!$tokens[$i]->isWhitespace() && !$tokens[$i]->isComment()) {
                return false;
            }
        }

        return true;
    }

    /**
     * @param Tokens $tokens
     * @param int    $index
     * @param bool   $after
     *
     * @return null|int
     */
    private function getSiblingContinuousSingleLineComment(Tokens $tokens, $index, $after)
    {
        $siblingIndex = $index;
        do {
            if ($after) {
                $siblingIndex = $tokens->getNextTokenOfKind($siblingIndex, [[T_COMMENT]]);
            } else {
                $siblingIndex = $tokens->getPrevTokenOfKind($siblingIndex, [[T_COMMENT]]);
            }

            if (null === $siblingIndex) {
                return null;
            }
        } while (0 === strpos($tokens[$siblingIndex]->getContent(), '/*'));

        $newLines = 0;
        for ($i = min($siblingIndex, $index) + 1, $max = max($siblingIndex, $index); $i < $max; ++$i) {
            if ($tokens[$i]->isWhitespace() && Preg::match('/\R/', $tokens[$i]->getContent())) {
                if (1 === $newLines || Preg::match('/\R.*\R/', $tokens[$i]->getContent())) {
                    return null;
                }

                ++$newLines;
            }
        }

        return $siblingIndex;
    }
}