262 lines
9.3 KiB
PHP
262 lines
9.3 KiB
PHP
<?php
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/**
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* WordPress Coding Standard.
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*
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* @package WPCS\WordPressCodingStandards
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* @link https://github.com/WordPress/WordPress-Coding-Standards
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* @license https://opensource.org/licenses/MIT MIT
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*/
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namespace WordPressCS\WordPress\Helpers;
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use PHP_CodeSniffer\Files\File;
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use PHP_CodeSniffer\Util\Tokens;
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use PHPCSUtils\Utils\GetTokensAsString;
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use PHPCSUtils\Utils\Parentheses;
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/**
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* Helper utilities for working with variables.
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*
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* ---------------------------------------------------------------------------------------------
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* This class is only intended for internal use by WordPressCS and is not part of the public API.
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* This also means that it has no promise of backward compatibility. Use at your own risk.
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* ---------------------------------------------------------------------------------------------
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*
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* {@internal The functionality in this class will likely be replaced at some point in
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* the future by functions from PHPCSUtils.}
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*
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* @internal
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*
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* @since 3.0.0 The methods in this class were previously contained in the
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* `WordPressCS\WordPress\Sniff` class and have been moved here.
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*/
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final class VariableHelper {
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/**
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* Get the index keys of an array variable.
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*
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* E.g., "bar" and "baz" in $foo['bar']['baz'].
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*
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* @since 2.1.0
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* @since 3.0.0 - Moved from the Sniff class to this class.
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* - Visibility is now `public` (was `protected`) and the method `static`.
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* - The `$phpcsFile` parameter was added.
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*
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* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
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* @param int $stackPtr The index of the variable token in the stack.
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* @param bool $all Whether to get all keys or only the first.
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* Defaults to `true`(= all).
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*
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* @return array An array of index keys whose value is being accessed.
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* or an empty array if this is not array access.
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*/
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public static function get_array_access_keys( File $phpcsFile, $stackPtr, $all = true ) {
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$tokens = $phpcsFile->getTokens();
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$keys = array();
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if ( isset( $tokens[ $stackPtr ] ) === false
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|| \T_VARIABLE !== $tokens[ $stackPtr ]['code']
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) {
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return $keys;
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}
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$current = $stackPtr;
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do {
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// Find the next non-empty token.
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$open_bracket = $phpcsFile->findNext(
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Tokens::$emptyTokens,
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( $current + 1 ),
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null,
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true
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);
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// If it isn't a bracket, this isn't an array-access.
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if ( false === $open_bracket
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|| \T_OPEN_SQUARE_BRACKET !== $tokens[ $open_bracket ]['code']
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|| ! isset( $tokens[ $open_bracket ]['bracket_closer'] )
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) {
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break;
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}
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$key = GetTokensAsString::compact(
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$phpcsFile,
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( $open_bracket + 1 ),
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( $tokens[ $open_bracket ]['bracket_closer'] - 1 ),
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true
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);
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$keys[] = trim( $key );
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$current = $tokens[ $open_bracket ]['bracket_closer'];
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} while ( isset( $tokens[ $current ] ) && true === $all );
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return $keys;
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}
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/**
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* Get the index key of an array variable.
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*
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* E.g., "bar" in $foo['bar'].
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*
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* @since 0.5.0
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* @since 2.1.0 Now uses get_array_access_keys() under the hood.
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* @since 3.0.0 - Moved from the Sniff class to this class.
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* - Visibility is now `public` (was `protected`) and the method `static`.
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* - The `$phpcsFile` parameter was added.
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*
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* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
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* @param int $stackPtr The index of the variable token in the stack.
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*
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* @return string|false The array index key whose value is being accessed.
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*/
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public static function get_array_access_key( File $phpcsFile, $stackPtr ) {
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$keys = self::get_array_access_keys( $phpcsFile, $stackPtr, false );
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if ( isset( $keys[0] ) ) {
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return $keys[0];
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}
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return false;
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}
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/**
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* Check whether a variable is being compared to another value.
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*
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* E.g., $var === 'foo', 1 <= $var, etc.
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*
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* Also recognizes `switch ( $var )` and `match ( $var )`.
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*
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* @since 0.5.0
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* @since 2.1.0 Added the $include_coalesce parameter.
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* @since 3.0.0 - Moved from the Sniff class to this class.
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* - Visibility is now `public` (was `protected`) and the method `static`.
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* - The `$phpcsFile` parameter was added.
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*
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* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
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* @param int $stackPtr The index of this token in the stack.
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* @param bool $include_coalesce Optional. Whether or not to regard the null
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* coalesce operator - ?? - as a comparison operator.
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* Defaults to true.
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* Null coalesce is a special comparison operator in this
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* sense as it doesn't compare a variable to whatever is
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* on the other side of the comparison operator.
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*
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* @return bool Whether this is a comparison.
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*/
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public static function is_comparison( File $phpcsFile, $stackPtr, $include_coalesce = true ) {
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$tokens = $phpcsFile->getTokens();
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if ( isset( $tokens[ $stackPtr ] ) === false ) {
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return false;
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}
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$comparisonTokens = Tokens::$comparisonTokens;
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if ( false === $include_coalesce ) {
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unset( $comparisonTokens[ \T_COALESCE ] );
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}
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// We first check if this is a switch or match statement (switch ( $var )).
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if ( Parentheses::lastOwnerIn( $phpcsFile, $stackPtr, array( \T_SWITCH, \T_MATCH ) ) !== false ) {
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return true;
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}
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// Find the previous non-empty token. We check before the var first because
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// yoda conditions are usually expected.
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$previous_token = $phpcsFile->findPrevious( Tokens::$emptyTokens, ( $stackPtr - 1 ), null, true );
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if ( isset( $comparisonTokens[ $tokens[ $previous_token ]['code'] ] ) ) {
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return true;
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}
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// Maybe the comparison operator is after this.
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$next_token = $phpcsFile->findNext( Tokens::$emptyTokens, ( $stackPtr + 1 ), null, true );
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// This might be an opening square bracket in the case of arrays ($var['a']).
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while ( false !== $next_token
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&& \T_OPEN_SQUARE_BRACKET === $tokens[ $next_token ]['code']
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&& isset( $tokens[ $next_token ]['bracket_closer'] )
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) {
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$next_token = $phpcsFile->findNext(
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Tokens::$emptyTokens,
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( $tokens[ $next_token ]['bracket_closer'] + 1 ),
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null,
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true
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);
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}
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if ( false !== $next_token && isset( $comparisonTokens[ $tokens[ $next_token ]['code'] ] ) ) {
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return true;
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}
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return false;
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}
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/**
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* Check if this variable is being assigned a value.
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*
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* E.g., $var = 'foo';
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*
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* Also handles array assignments to arbitrary depth:
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*
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* $array['key'][ $foo ][ something() ] = $bar;
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*
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* @since 0.5.0
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* @since 3.0.0 - Moved from the Sniff class to this class.
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* - Visibility is now `public` (was `protected`) and the method `static`.
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* - The `$phpcsFile` parameter was added.
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* - The `$include_coalesce` parameter was added.
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*
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* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
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* @param int $stackPtr The index of the token in the stack.
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* This must point to either a T_VARIABLE or
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* T_CLOSE_SQUARE_BRACKET token.
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* @param bool $include_coalesce Optional. Whether or not to regard the null
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* coalesce operator - ?? - as a comparison operator.
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* Defaults to true.
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* Null coalesce is a special comparison operator in this
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* sense as it doesn't compare a variable to whatever is
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* on the other side of the comparison operator.
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*
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* @return bool Whether the token is a variable being assigned a value.
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*/
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public static function is_assignment( File $phpcsFile, $stackPtr, $include_coalesce = true ) {
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$tokens = $phpcsFile->getTokens();
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if ( isset( $tokens[ $stackPtr ] ) === false ) {
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return false;
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}
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static $valid = array(
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\T_VARIABLE => true,
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\T_CLOSE_SQUARE_BRACKET => true,
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);
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// Must be a variable or closing square bracket (see below).
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if ( ! isset( $valid[ $tokens[ $stackPtr ]['code'] ] ) ) {
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return false;
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}
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$next_non_empty = $phpcsFile->findNext( Tokens::$emptyTokens, ( $stackPtr + 1 ), null, true, null, true );
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// No token found.
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if ( false === $next_non_empty ) {
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return false;
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}
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$assignmentTokens = Tokens::$assignmentTokens;
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if ( false === $include_coalesce ) {
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unset( $assignmentTokens[ \T_COALESCE_EQUAL ] );
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}
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// If the next token is an assignment, that's all we need to know.
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if ( isset( $assignmentTokens[ $tokens[ $next_non_empty ]['code'] ] ) ) {
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return true;
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}
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// Check if this is an array assignment, e.g., `$var['key'] = 'val';` .
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if ( \T_OPEN_SQUARE_BRACKET === $tokens[ $next_non_empty ]['code']
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&& isset( $tokens[ $next_non_empty ]['bracket_closer'] )
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) {
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return self::is_assignment( $phpcsFile, $tokens[ $next_non_empty ]['bracket_closer'], $include_coalesce );
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}
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return false;
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}
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}
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