<?php
/**
 * WordPress Coding Standard.
 *
 * @package WPCS\WordPressCodingStandards
 * @link    https://github.com/WordPress/WordPress-Coding-Standards
 * @license https://opensource.org/licenses/MIT MIT
 */

namespace WordPressCS\WordPress\Sniffs\WhiteSpace;

use PHP_CodeSniffer\Util\Tokens;
use PHPCSUtils\Tokens\Collections;
use WordPressCS\WordPress\Sniff;

/**
 * Checks that control structures have the correct spacing around brackets, based upon Squiz code.
 *
 * @since 0.1.0
 * @since 2013-06-11 This sniff no longer supports JS.
 * @since 0.3.0      This sniff now has the ability to fix most errors it flags.
 * @since 0.7.0      This class now extends the WordPressCS native `Sniff` class.
 * @since 0.13.0     Class name changed: this class is now namespaced.
 * @since 3.0.0      Checks related to function declarations have been removed from this sniff.
 *
 * Last synced with base class 2021-11-20 at commit 7f11ffc8222b123c06345afd3261221561c3bb29.
 * Note: This class has diverged quite far from the original. All the same, checking occasionally
 * to see if there are upstream fixes made from which this sniff can benefit, is warranted.
 * @link https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/src/Standards/Squiz/Sniffs/WhiteSpace/ControlStructureSpacingSniff.php
 */
final class ControlStructureSpacingSniff extends Sniff {

	/**
	 * Check for blank lines on start/end of control structures.
	 *
	 * @var boolean
	 */
	public $blank_line_check = false;

	/**
	 * Check for blank lines after control structures.
	 *
	 * @var boolean
	 */
	public $blank_line_after_check = true;

	/**
	 * Require for space before T_COLON when using the alternative syntax for control structures.
	 *
	 * @var string one of 'required', 'forbidden', 'optional'
	 */
	public $space_before_colon = 'required';

	/**
	 * Tokens for which to ignore extra space on the inside of parenthesis.
	 *
	 * For do / else / try / finally, there are no parenthesis, so skip it.
	 *
	 * @since 0.11.0
	 *
	 * @var array
	 */
	private $ignore_extra_space_after_open_paren = array(
		\T_DO      => true,
		\T_ELSE    => true,
		\T_TRY     => true,
		\T_FINALLY => true,
	);

	/**
	 * Returns an array of tokens this test wants to listen for.
	 *
	 * @return array
	 */
	public function register() {
		return array(
			\T_IF,
			\T_WHILE,
			\T_FOREACH,
			\T_FOR,
			\T_SWITCH,
			\T_DO,
			\T_ELSE,
			\T_ELSEIF,
			\T_TRY,
			\T_CATCH,
			\T_FINALLY,
			\T_MATCH,
		);
	}

	/**
	 * Processes this test, when one of its tokens is encountered.
	 *
	 * @param int $stackPtr The position of the current token in the stack.
	 *
	 * @return void
	 */
	public function process_token( $stackPtr ) {
		if ( isset( $this->tokens[ ( $stackPtr + 1 ) ] ) && \T_WHITESPACE !== $this->tokens[ ( $stackPtr + 1 ) ]['code']
			&& ! ( \T_ELSE === $this->tokens[ $stackPtr ]['code'] && \T_COLON === $this->tokens[ ( $stackPtr + 1 ) ]['code'] )
		) {
			$error = 'Space after opening control structure is required';
			$fix   = $this->phpcsFile->addFixableError( $error, $stackPtr, 'NoSpaceAfterStructureOpen' );

			if ( true === $fix ) {
				$this->phpcsFile->fixer->addContent( $stackPtr, ' ' );
			}
		}

		if ( ! isset( $this->tokens[ $stackPtr ]['scope_opener'], $this->tokens[ $stackPtr ]['scope_closer'] ) ) {
			if ( \T_WHILE !== $this->tokens[ $stackPtr ]['code'] ) {
				return;
			}
		} else {
			$scopeOpener = $this->tokens[ $stackPtr ]['scope_opener'];
			$scopeCloser = $this->tokens[ $stackPtr ]['scope_closer'];
		}

		// Alternative syntax.
		if ( isset( $scopeOpener ) && \T_COLON === $this->tokens[ $scopeOpener ]['code'] ) {

			if ( 'required' === $this->space_before_colon ) {

				if ( \T_WHITESPACE !== $this->tokens[ ( $scopeOpener - 1 ) ]['code'] ) {
					$error = 'Space between opening control structure and T_COLON is required';
					$fix   = $this->phpcsFile->addFixableError( $error, $scopeOpener, 'NoSpaceBetweenStructureColon' );

					if ( true === $fix ) {
						$this->phpcsFile->fixer->addContentBefore( $scopeOpener, ' ' );
					}
				}
			} elseif ( 'forbidden' === $this->space_before_colon ) {

				if ( \T_WHITESPACE === $this->tokens[ ( $scopeOpener - 1 ) ]['code'] ) {
					$error = 'Extra space between opening control structure and T_COLON found';
					$fix   = $this->phpcsFile->addFixableError( $error, ( $scopeOpener - 1 ), 'SpaceBetweenStructureColon' );

					if ( true === $fix ) {
						$this->phpcsFile->fixer->replaceToken( ( $scopeOpener - 1 ), '' );
					}
				}
			}
		}

		$parenthesisOpener = $this->phpcsFile->findNext( Tokens::$emptyTokens, ( $stackPtr + 1 ), null, true );

		if ( \T_COLON !== $this->tokens[ $parenthesisOpener ]['code']
			&& ( $stackPtr + 1 ) === $parenthesisOpener
		) {
			// Checking space between keyword and open parenthesis, i.e. `if[*](...) {}`.
			$error = 'No space before opening parenthesis is prohibited';
			$fix   = $this->phpcsFile->addFixableError( $error, $stackPtr, 'NoSpaceBeforeOpenParenthesis' );

			if ( true === $fix ) {
				$this->phpcsFile->fixer->addContent( $stackPtr, ' ' );
			}
		}

		if ( \T_WHITESPACE === $this->tokens[ ( $stackPtr + 1 ) ]['code']
			&& ' ' !== $this->tokens[ ( $stackPtr + 1 ) ]['content']
		) {
			// Checking (too much) space between keyword and open parenthesis, i.e. `if [*](...) {}`.
			$error = 'Expected exactly one space before opening parenthesis; "%s" found.';
			$fix   = $this->phpcsFile->addFixableError(
				$error,
				$stackPtr,
				'ExtraSpaceBeforeOpenParenthesis',
				array( $this->tokens[ ( $stackPtr + 1 ) ]['content'] )
			);

			if ( true === $fix ) {
				$this->phpcsFile->fixer->replaceToken( ( $stackPtr + 1 ), ' ' );
			}
		}

		if ( \T_CLOSE_PARENTHESIS !== $this->tokens[ ( $parenthesisOpener + 1 ) ]['code'] ) {
			if ( \T_WHITESPACE !== $this->tokens[ ( $parenthesisOpener + 1 ) ]['code'] ) {
				// Checking space directly after the open parenthesis, i.e. `if ([*]...) {}`.
				$error = 'No space after opening parenthesis is prohibited';
				$fix   = $this->phpcsFile->addFixableError( $error, $stackPtr, 'NoSpaceAfterOpenParenthesis' );

				if ( true === $fix ) {
					$this->phpcsFile->fixer->addContent( $parenthesisOpener, ' ' );
				}
			} elseif ( ( ' ' !== $this->tokens[ ( $parenthesisOpener + 1 ) ]['content']
				&& "\n" !== $this->tokens[ ( $parenthesisOpener + 1 ) ]['content']
				&& "\r\n" !== $this->tokens[ ( $parenthesisOpener + 1 ) ]['content'] )
				&& ! isset( $this->ignore_extra_space_after_open_paren[ $this->tokens[ $stackPtr ]['code'] ] )
			) {
				// Checking (too much) space directly after the open parenthesis, i.e. `if ([*]...) {}`.
				$error = 'Expected exactly one space after opening parenthesis; "%s" found.';
				$fix   = $this->phpcsFile->addFixableError(
					$error,
					$stackPtr,
					'ExtraSpaceAfterOpenParenthesis',
					array( $this->tokens[ ( $parenthesisOpener + 1 ) ]['content'] )
				);

				if ( true === $fix ) {
					$this->phpcsFile->fixer->replaceToken( ( $parenthesisOpener + 1 ), ' ' );
				}
			}
		}

		if ( isset( $this->tokens[ $parenthesisOpener ]['parenthesis_closer'] ) ) {

			$parenthesisCloser = $this->tokens[ $parenthesisOpener ]['parenthesis_closer'];

			if ( \T_CLOSE_PARENTHESIS !== $this->tokens[ ( $parenthesisOpener + 1 ) ]['code'] ) {

				// Checking space directly before the close parenthesis, i.e. `if (...[*]) {}`.
				if ( \T_WHITESPACE !== $this->tokens[ ( $parenthesisCloser - 1 ) ]['code'] ) {
					$error = 'No space before closing parenthesis is prohibited';
					$fix   = $this->phpcsFile->addFixableError( $error, $parenthesisCloser, 'NoSpaceBeforeCloseParenthesis' );

					if ( true === $fix ) {
						$this->phpcsFile->fixer->addContentBefore( $parenthesisCloser, ' ' );
					}
				} elseif ( ' ' !== $this->tokens[ ( $parenthesisCloser - 1 ) ]['content'] ) {
					$prevNonEmpty = $this->phpcsFile->findPrevious( Tokens::$emptyTokens, ( $parenthesisCloser - 1 ), null, true );
					if ( $this->tokens[ ( $parenthesisCloser ) ]['line'] === $this->tokens[ ( $prevNonEmpty + 1 ) ]['line'] ) {
						$error = 'Expected exactly one space before closing parenthesis; "%s" found.';
						$fix   = $this->phpcsFile->addFixableError(
							$error,
							$stackPtr,
							'ExtraSpaceBeforeCloseParenthesis',
							array( $this->tokens[ ( $parenthesisCloser - 1 ) ]['content'] )
						);

						if ( true === $fix ) {
							$this->phpcsFile->fixer->replaceToken( ( $parenthesisCloser - 1 ), ' ' );
						}
					}
				}

				if ( \T_WHITESPACE !== $this->tokens[ ( $parenthesisCloser + 1 ) ]['code']
					&& ( isset( $scopeOpener ) && \T_COLON !== $this->tokens[ $scopeOpener ]['code'] )
				) {
					$error = 'Space between opening control structure and closing parenthesis is required';
					$fix   = $this->phpcsFile->addFixableError( $error, $scopeOpener, 'NoSpaceAfterCloseParenthesis' );

					if ( true === $fix ) {
						$this->phpcsFile->fixer->addContentBefore( $scopeOpener, ' ' );
					}
				}
			}

			if ( isset( $this->tokens[ $parenthesisOpener ]['parenthesis_owner'] )
				&& ( isset( $scopeOpener )
				&& $this->tokens[ $parenthesisCloser ]['line'] !== $this->tokens[ $scopeOpener ]['line'] )
			) {
				$error = 'Opening brace should be on the same line as the declaration';
				$fix   = $this->phpcsFile->addFixableError( $error, $parenthesisOpener, 'OpenBraceNotSameLine' );

				if ( true === $fix ) {
					$this->phpcsFile->fixer->beginChangeset();

					for ( $i = ( $parenthesisCloser + 1 ); $i < $scopeOpener; $i++ ) {
						$this->phpcsFile->fixer->replaceToken( $i, '' );
					}

					$this->phpcsFile->fixer->addContent( $parenthesisCloser, ' ' );
					$this->phpcsFile->fixer->endChangeset();
				}
				return;

			} elseif ( \T_WHITESPACE === $this->tokens[ ( $parenthesisCloser + 1 ) ]['code']
				&& ' ' !== $this->tokens[ ( $parenthesisCloser + 1 ) ]['content']
			) {
				// Checking space between the close parenthesis and the open brace, i.e. `if (...) [*]{}`.
				$error = 'Expected exactly one space between closing parenthesis and opening control structure; "%s" found.';
				$fix   = $this->phpcsFile->addFixableError(
					$error,
					$stackPtr,
					'ExtraSpaceAfterCloseParenthesis',
					array( $this->tokens[ ( $parenthesisCloser + 1 ) ]['content'] )
				);

				if ( true === $fix ) {
					$this->phpcsFile->fixer->replaceToken( ( $parenthesisCloser + 1 ), ' ' );
				}
			}
		}

		if ( false !== $this->blank_line_check && isset( $scopeOpener ) ) {
			$firstContent = $this->phpcsFile->findNext( \T_WHITESPACE, ( $scopeOpener + 1 ), null, true );

			// We ignore spacing for some structures that tend to have their own rules.
			$ignore  = array(
				\T_DOC_COMMENT_OPEN_TAG => true,
				\T_CLOSE_TAG            => true,
				\T_COMMENT              => true,
			);
			$ignore += Collections::closedScopes();

			if ( ! isset( $ignore[ $this->tokens[ $firstContent ]['code'] ] )
				&& $this->tokens[ $firstContent ]['line'] > ( $this->tokens[ $scopeOpener ]['line'] + 1 )
			) {
				$gap = ( $this->tokens[ $firstContent ]['line'] - $this->tokens[ $scopeOpener ]['line'] - 1 );
				$this->phpcsFile->recordMetric( $stackPtr, 'Blank lines at start of control structure', $gap );

				$error = 'Blank line found at start of control structure';
				$fix   = $this->phpcsFile->addFixableError( $error, $scopeOpener, 'BlankLineAfterStart' );

				if ( true === $fix ) {
					$this->phpcsFile->fixer->beginChangeset();

					for ( $i = ( $scopeOpener + 1 ); $i < $firstContent; $i++ ) {
						if ( $this->tokens[ $i ]['line'] === $this->tokens[ $firstContent ]['line'] ) {
							break;
						}
						$this->phpcsFile->fixer->replaceToken( $i, '' );
					}

					$this->phpcsFile->fixer->addNewline( $scopeOpener );
					$this->phpcsFile->fixer->endChangeset();
				}
			} else {
				$this->phpcsFile->recordMetric( $stackPtr, 'Blank lines at start of control structure', 0 );
			}

			if ( isset( $scopeCloser ) && $firstContent !== $scopeCloser ) {
				$lastContent = $this->phpcsFile->findPrevious( \T_WHITESPACE, ( $scopeCloser - 1 ), null, true );

				$lastNonEmptyContent = $this->phpcsFile->findPrevious( Tokens::$emptyTokens, ( $scopeCloser - 1 ), null, true );

				$checkToken = $lastContent;
				if ( isset( $this->tokens[ $lastNonEmptyContent ]['scope_condition'] ) ) {
					$checkToken = $this->tokens[ $lastNonEmptyContent ]['scope_condition'];
				}

				if ( ! isset( $ignore[ $this->tokens[ $checkToken ]['code'] ] )
					&& $this->tokens[ $lastContent ]['line'] <= ( $this->tokens[ $scopeCloser ]['line'] - 2 )
				) {
					$gap = ( $this->tokens[ $scopeCloser ]['line'] - $this->tokens[ $lastContent ]['line'] - 1 );
					$this->phpcsFile->recordMetric( $stackPtr, 'Blank lines at end of control structure', $gap );

					for ( $i = ( $scopeCloser - 1 ); $i > $lastContent; $i-- ) {
						if ( $this->tokens[ $i ]['line'] < $this->tokens[ $scopeCloser ]['line']
							&& \T_OPEN_TAG !== $this->tokens[ $firstContent ]['code']
						) {
							// TODO: Reporting error at empty line won't highlight it in IDE.
							$error = 'Blank line found at end of control structure';
							$fix   = $this->phpcsFile->addFixableError( $error, $i, 'BlankLineBeforeEnd' );

							if ( true === $fix ) {
								$this->phpcsFile->fixer->beginChangeset();

								for ( $j = ( $lastContent + 1 ); $j < $scopeCloser; $j++ ) {
									if ( $this->tokens[ $j ]['line'] === $this->tokens[ $scopeCloser ]['line'] ) {
										break;
									}
									$this->phpcsFile->fixer->replaceToken( $j, '' );
								}

								/*
								 * PHPCS annotations, like normal inline comments, are tokenized including
								 * the new line at the end, so don't add any extra as it would cause a fixer
								 * conflict.
								 */
								if ( \T_COMMENT !== $this->tokens[ $lastContent ]['code']
									&& ! isset( Tokens::$phpcsCommentTokens[ $this->tokens[ $lastContent ]['code'] ] ) ) {
									$this->phpcsFile->fixer->addNewlineBefore( $j );
								}

								$this->phpcsFile->fixer->endChangeset();
							}
							break;
						}
					}
				} else {
					$this->phpcsFile->recordMetric( $stackPtr, 'Blank lines at end of control structure', 0 );
				}
			}
			unset( $ignore );
		}

		if ( ! isset( $scopeCloser ) || true !== $this->blank_line_after_check ) {
			return;
		}

		if ( \T_MATCH === $this->tokens[ $stackPtr ]['code'] ) {
			// Move the scope closer to the semicolon/comma.
			$next = $this->phpcsFile->findNext( Tokens::$emptyTokens, ( $scopeCloser + 1 ), null, true );
			if ( false !== $next
				&& ( \T_SEMICOLON === $this->tokens[ $next ]['code'] || \T_COMMA === $this->tokens[ $next ]['code'] )
			) {
				$scopeCloser = $next;
			}
		}

		// {@internal This is just for the blank line check. Only whitespace should be considered,
		// not "other" empty tokens.}}
		$trailingContent = $this->phpcsFile->findNext( \T_WHITESPACE, ( $scopeCloser + 1 ), null, true );
		if ( false === $trailingContent ) {
			return;
		}

		if ( \T_COMMENT === $this->tokens[ $trailingContent ]['code']
			|| isset( Tokens::$phpcsCommentTokens[ $this->tokens[ $trailingContent ]['code'] ] )
		) {
			// Special exception for code where the comment about
			// an ELSE or ELSEIF is written between the control structures.
			$nextCode = $this->phpcsFile->findNext( Tokens::$emptyTokens, ( $scopeCloser + 1 ), null, true );

			if ( \T_ELSE === $this->tokens[ $nextCode ]['code'] || \T_ELSEIF === $this->tokens[ $nextCode ]['code'] ) {
				$trailingContent = $nextCode;
			}

			// Move past end comments.
			if ( $this->tokens[ $trailingContent ]['line'] === $this->tokens[ $scopeCloser ]['line'] ) {
				if ( preg_match( '`^//[ ]?end`i', $this->tokens[ $trailingContent ]['content'] ) > 0 ) {
					$scopeCloser     = $trailingContent;
					$trailingContent = $this->phpcsFile->findNext( \T_WHITESPACE, ( $trailingContent + 1 ), null, true );
				}
			}
		}

		if ( \T_ELSE === $this->tokens[ $trailingContent ]['code'] && \T_IF === $this->tokens[ $stackPtr ]['code'] ) {
			// IF with ELSE.
			return;
		}

		if ( \T_WHILE === $this->tokens[ $trailingContent ]['code'] && \T_DO === $this->tokens[ $stackPtr ]['code'] ) {
			// DO with WHILE.
			return;
		}

		if ( \T_CATCH === $this->tokens[ $trailingContent ]['code'] && \T_TRY === $this->tokens[ $stackPtr ]['code'] ) {
			// TRY with CATCH.
			return;
		}

		if ( \T_FINALLY === $this->tokens[ $trailingContent ]['code'] && \T_CATCH === $this->tokens[ $stackPtr ]['code'] ) {
			// CATCH with FINALLY.
			return;
		}

		if ( \T_FINALLY === $this->tokens[ $trailingContent ]['code'] && \T_TRY === $this->tokens[ $stackPtr ]['code'] ) {
			// TRY with FINALLY.
			return;
		}

		if ( \T_CLOSE_TAG === $this->tokens[ $trailingContent ]['code'] ) {
			// At the end of the script or embedded code.
			return;
		}

		if ( isset( $this->tokens[ $trailingContent ]['scope_condition'] )
			&& \T_CLOSE_CURLY_BRACKET === $this->tokens[ $trailingContent ]['code']
		) {
			// Another control structure's closing brace.
			$owner = $this->tokens[ $trailingContent ]['scope_condition'];
			if ( isset( Collections::closedScopes()[ $this->tokens[ $owner ]['code'] ] ) === true ) {
				// The next content is the closing brace of a function, class, interface or trait
				// so normal function/class rules apply and we can ignore it.
				return;
			}

			if ( ( $this->tokens[ $scopeCloser ]['line'] + 1 ) !== $this->tokens[ $trailingContent ]['line'] ) {
				// TODO: Won't cover following case: "} echo 'OK';".
				$error = 'Blank line found after control structure';
				$fix   = $this->phpcsFile->addFixableError( $error, $scopeCloser, 'BlankLineAfterEnd' );

				if ( true === $fix ) {
					$this->phpcsFile->fixer->beginChangeset();

					$i = ( $scopeCloser + 1 );
					while ( $this->tokens[ $i ]['line'] !== $this->tokens[ $trailingContent ]['line'] ) {
						$this->phpcsFile->fixer->replaceToken( $i, '' );
						++$i;
					}

					// TODO: Instead a separate error should be triggered when content comes right after closing brace.
					if ( \T_COMMENT !== $this->tokens[ $scopeCloser ]['code']
						&& isset( Tokens::$phpcsCommentTokens[ $this->tokens[ $scopeCloser ]['code'] ] ) === false
					) {
						$this->phpcsFile->fixer->addNewlineBefore( $trailingContent );
					}
					$this->phpcsFile->fixer->endChangeset();
				}
			}
		}
	}
}
