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<?php
/**
* PHPCompatibility, an external standard for PHP_CodeSniffer.
*
* @package PHPCompatibility
* @copyright 2012-2020 PHPCompatibility Contributors
* @license https://opensource.org/licenses/LGPL-3.0 LGPL3
* @link https://github.com/PHPCompatibility/PHPCompatibility
*/
namespace PHPCompatibility\Helpers;
use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Util\Tokens;
use PHPCompatibility\Helpers\ScannedCode;
use PHPCSUtils\Utils\TextStrings;
/**
* Helper functions to determine if a set of consecutive tokens complies with certain criteria.
*
* ---------------------------------------------------------------------------------------------
* This class is only intended for internal use by PHPCompatibility and is not part of the public API.
* This also means that it has no promise of backward compatibility. Use at your own risk.
* ---------------------------------------------------------------------------------------------
*
* @since 10.0.0 These functions were moved from the generic `Sniff` class to this class.
*/
final class TokenGroup
{
/**
* Determine whether the tokens between $start and $end together form a positive number
* as recognized by PHP.
*
* The outcome of this function is reliable for `true`, `false` should be regarded as
* "undetermined".
*
* Note: Zero is *not* regarded as a positive number.
*
* @since 8.2.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $start Start of the snippet (inclusive), i.e. this
* token will be examined as part of the
* snippet.
* @param int $end End of the snippet (inclusive), i.e. this
* token will be examined as part of the
* snippet.
* @param bool $allowFloats Whether to only consider integers, or also floats.
*
* @return bool True if PHP would evaluate the snippet as a positive number.
* False if not or if it could not be reliably determined
* (variable or calculations and such).
*/
public static function isPositiveNumber(File $phpcsFile, $start, $end, $allowFloats = false)
{
$number = self::isNumber($phpcsFile, $start, $end, $allowFloats);
if ($number === false) {
return false;
}
return ($number > 0);
}
/**
* Determine whether the tokens between $start and $end together form a negative number
* as recognized by PHP.
*
* The outcome of this function is reliable for `true`, `false` should be regarded as
* "undetermined".
*
* Note: Zero is *not* regarded as a negative number.
*
* @since 8.2.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $start Start of the snippet (inclusive), i.e. this
* token will be examined as part of the
* snippet.
* @param int $end End of the snippet (inclusive), i.e. this
* token will be examined as part of the
* snippet.
* @param bool $allowFloats Whether to only consider integers, or also floats.
*
* @return bool True if PHP would evaluate the snippet as a negative number.
* False if not or if it could not be reliably determined
* (variable or calculations and such).
*/
public static function isNegativeNumber(File $phpcsFile, $start, $end, $allowFloats = false)
{
$number = self::isNumber($phpcsFile, $start, $end, $allowFloats);
if ($number === false) {
return false;
}
return ($number < 0);
}
/**
* Determine whether the tokens between $start and $end together form a number
* as recognized by PHP.
*
* The outcome of this function is reliable for "true-ish" values, `false` should
* be regarded as "undetermined".
*
* @link https://3v4l.org/npTeM
*
* Mainly intended for examining variable assignments, function call parameters, array values
* where the start and end of the snippet to examine is very clear.
*
* @since 8.2.0
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $start Start of the snippet (inclusive), i.e. this
* token will be examined as part of the
* snippet.
* @param int $end End of the snippet (inclusive), i.e. this
* token will be examined as part of the
* snippet.
* @param bool $allowFloats Whether to only consider integers, or also floats.
*
* @return int|float|bool The number found if PHP would evaluate the snippet as a number.
* The return type will be int if $allowFloats is false, if
* $allowFloats is true, the return type will be float.
* False will be returned when the snippet does not evaluate to a
* number or if it could not be reliably determined
* (variable or calculations and such).
*/
public static function isNumber(File $phpcsFile, $start, $end, $allowFloats = false)
{
$stringTokens = Tokens::$heredocTokens + Tokens::$stringTokens;
$validTokens = [];
$validTokens[\T_LNUMBER] = true;
$validTokens[\T_TRUE] = true; // Evaluates to int 1.
$validTokens[\T_FALSE] = true; // Evaluates to int 0.
$validTokens[\T_NULL] = true; // Evaluates to int 0.
if ($allowFloats === true) {
$validTokens[\T_DNUMBER] = true;
}
$maybeValidTokens = $stringTokens + $validTokens;
$tokens = $phpcsFile->getTokens();
$searchEnd = ($end + 1);
$negativeNumber = false;
if (isset($tokens[$start], $tokens[$searchEnd]) === false) {
return false;
}
$nextNonEmpty = $phpcsFile->findNext(Tokens::$emptyTokens, $start, $searchEnd, true);
while ($nextNonEmpty !== false
&& ($tokens[$nextNonEmpty]['code'] === \T_PLUS
|| $tokens[$nextNonEmpty]['code'] === \T_MINUS)
) {
if ($tokens[$nextNonEmpty]['code'] === \T_MINUS) {
$negativeNumber = ($negativeNumber === false) ? true : false;
}
$nextNonEmpty = $phpcsFile->findNext(Tokens::$emptyTokens, ($nextNonEmpty + 1), $searchEnd, true);
}
if ($nextNonEmpty === false || isset($maybeValidTokens[$tokens[$nextNonEmpty]['code']]) === false) {
return false;
}
$content = false;
if ($tokens[$nextNonEmpty]['code'] === \T_LNUMBER
|| $tokens[$nextNonEmpty]['code'] === \T_DNUMBER
) {
$content = (float) $tokens[$nextNonEmpty]['content'];
} elseif ($tokens[$nextNonEmpty]['code'] === \T_TRUE) {
$content = 1.0;
} elseif ($tokens[$nextNonEmpty]['code'] === \T_FALSE
|| $tokens[$nextNonEmpty]['code'] === \T_NULL
) {
$content = 0.0;
} elseif (isset($stringTokens[$tokens[$nextNonEmpty]['code']]) === true) {
if ($tokens[$nextNonEmpty]['code'] === \T_START_HEREDOC
|| $tokens[$nextNonEmpty]['code'] === \T_START_NOWDOC
) {
// Skip past heredoc/nowdoc opener to the first content.
$firstDocToken = $phpcsFile->findNext([\T_HEREDOC, \T_NOWDOC], ($nextNonEmpty + 1), $searchEnd);
if ($firstDocToken === false) {
// Live coding or parse error.
return false;
}
$stringContent = $content = $tokens[$firstDocToken]['content'];
// Skip forward to the end in preparation for the next part of the examination.
$nextNonEmpty = $phpcsFile->findNext([\T_END_HEREDOC, \T_END_NOWDOC], ($nextNonEmpty + 1), $searchEnd);
if ($nextNonEmpty === false) {
// Live coding or parse error.
return false;
}
} else {
// Gather subsequent lines for a multi-line string.
for ($i = $nextNonEmpty; $i < $searchEnd; $i++) {
if ($tokens[$i]['code'] !== $tokens[$nextNonEmpty]['code']) {
break;
}
$content .= $tokens[$i]['content'];
}
$nextNonEmpty = --$i;
$content = TextStrings::stripQuotes($content);
$stringContent = $content;
}
/*
* Regexes based on the formats outlined in the manual, created by JRF.
* @link https://www.php.net/manual/en/language.types.float.php
*/
$regexInt = '`^\s*[0-9]+`';
$regexFloat = '`^\s*(?:[+-]?(?:(?:(?P<LNUM>[0-9]+)|(?P<DNUM>([0-9]*\.(?P>LNUM)|(?P>LNUM)\.[0-9]*)))[eE][+-]?(?P>LNUM))|(?P>DNUM))`';
$intString = \preg_match($regexInt, $content, $intMatch);
$floatString = \preg_match($regexFloat, $content, $floatMatch);
// Does the text string start with a number ? If so, PHP would juggle it and use it as a number.
if ($allowFloats === false) {
if ($intString !== 1 || $floatString === 1) {
if ($floatString === 1) {
// Found float. Only integers targetted.
return false;
}
$content = 0.0;
} else {
$content = (float) \trim($intMatch[0]);
}
} else {
if ($intString !== 1 && $floatString !== 1) {
$content = 0.0;
} else {
$content = ($floatString === 1) ? (float) \trim($floatMatch[0]) : (float) \trim($intMatch[0]);
}
}
// Allow for different behaviour for hex numeric strings between PHP 5 vs PHP 7.
if ($intString === 1 && \trim($intMatch[0]) === '0'
&& \preg_match('`^\s*(0x[A-Fa-f0-9]+)`', $stringContent, $hexNumberString) === 1
&& ScannedCode::shouldRunOnOrBelow('5.6') === true
) {
// The filter extension still allows for hex numeric strings in PHP 7, so
// use that to get the numeric value if possible.
// If the filter extension is not available, the value will be zero, but so be it.
if (\function_exists('filter_var')) {
$filtered = \filter_var($hexNumberString[1], \FILTER_VALIDATE_INT, \FILTER_FLAG_ALLOW_HEX);
if ($filtered !== false) {
$content = $filtered;
}
}
}
}
// OK, so we have a number, now is there still more code after it ?
$nextNonEmpty = $phpcsFile->findNext(Tokens::$emptyTokens, ($nextNonEmpty + 1), $searchEnd, true);
if ($nextNonEmpty !== false) {
return false;
}
if ($negativeNumber === true) {
$content = -$content;
}
if ($allowFloats === false) {
return (int) $content;
}
return $content;
}
/**
* Determine whether the tokens between $start and $end together form a numberic calculation
* as recognized by PHP.
*
* The outcome of this function is reliable for `true`, `false` should be regarded as "undetermined".
*
* Mainly intended for examining variable assignments, function call parameters, array values
* where the start and end of the snippet to examine is very clear.
*
* @since 9.0.0
* @since 10.0.0 This method is now static.
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $start Start of the snippet (inclusive), i.e. this
* token will be examined as part of the
* snippet.
* @param int $end End of the snippet (inclusive), i.e. this
* token will be examined as part of the
* snippet.
*
* @return bool
*/
public static function isNumericCalculation(File $phpcsFile, $start, $end)
{
$arithmeticTokens = Tokens::$arithmeticTokens;
$skipTokens = Tokens::$emptyTokens;
$skipTokens[] = \T_MINUS;
$skipTokens[] = \T_PLUS;
// Find the first arithmetic operator, but skip past +/- signs before numbers.
$nextNonEmpty = ($start - 1);
do {
$nextNonEmpty = $phpcsFile->findNext($skipTokens, ($nextNonEmpty + 1), ($end + 1), true);
$arithmeticOperator = $phpcsFile->findNext($arithmeticTokens, ($nextNonEmpty + 1), ($end + 1));
} while ($nextNonEmpty !== false && $arithmeticOperator !== false && $nextNonEmpty === $arithmeticOperator);
if ($arithmeticOperator === false) {
return false;
}
$tokens = $phpcsFile->getTokens();
$subsetStart = $start;
$subsetEnd = ($arithmeticOperator - 1);
while (self::isNumber($phpcsFile, $subsetStart, $subsetEnd, true) !== false
&& isset($tokens[($arithmeticOperator + 1)]) === true
) {
$subsetStart = ($arithmeticOperator + 1);
$nextNonEmpty = $arithmeticOperator;
do {
$nextNonEmpty = $phpcsFile->findNext($skipTokens, ($nextNonEmpty + 1), ($end + 1), true);
$arithmeticOperator = $phpcsFile->findNext($arithmeticTokens, ($nextNonEmpty + 1), ($end + 1));
} while ($nextNonEmpty !== false && $arithmeticOperator !== false && $nextNonEmpty === $arithmeticOperator);
if ($arithmeticOperator === false) {
// Last calculation operator already reached.
if (self::isNumber($phpcsFile, $subsetStart, $end, true) !== false) {
return true;
}
return false;
}
$subsetEnd = ($arithmeticOperator - 1);
}
return false;
}
/**
* Determine whether the tokens between $start and $end could together represent a variable.
*
* @since 9.0.0
* @since 10.0.0 This method is now static.
*
* @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
* @param int $start Starting point stack pointer. Inclusive.
* I.e. this token should be taken into
* account.
* @param int $end End point stack pointer. Exclusive.
* I.e. this token should not be taken
* into account.
* @param int $targetNestingLevel The nesting level the variable should be at.
*
* @return bool
*/
public static function isVariable(File $phpcsFile, $start, $end, $targetNestingLevel)
{
static $disallowedTokens, $bracketTokens;
// Create the token arrays only once.
if (isset($disallowedTokens, $bracketTokens) === false) {
$disallowedTokens = [
\T_OPEN_PARENTHESIS => \T_OPEN_PARENTHESIS,
\T_STRING_CONCAT => \T_STRING_CONCAT,
];
$disallowedTokens += Tokens::$assignmentTokens;
$disallowedTokens += Tokens::$equalityTokens;
$disallowedTokens += Tokens::$comparisonTokens;
$disallowedTokens += Tokens::$operators;
$disallowedTokens += Tokens::$booleanOperators;
$disallowedTokens += Tokens::$castTokens;
/*
* List of brackets which can be part of a variable variable.
*
* Key is the open bracket token, value the close bracket token.
*/
$bracketTokens = [
\T_OPEN_CURLY_BRACKET => \T_CLOSE_CURLY_BRACKET,
\T_OPEN_SQUARE_BRACKET => \T_CLOSE_SQUARE_BRACKET,
];
}
$tokens = $phpcsFile->getTokens();
// If no variable at all was found, then it's definitely a no-no.
$hasVariable = $phpcsFile->findNext(\T_VARIABLE, $start, $end);
if ($hasVariable === false) {
return false;
}
// Check if the variable found is at the right level. Deeper levels are always an error.
if (isset($tokens[$hasVariable]['nested_parenthesis'])
&& \count($tokens[$hasVariable]['nested_parenthesis']) !== $targetNestingLevel
) {
return false;
}
// Ok, so the first variable is at the right level, now are there any
// disallowed tokens within the empty() ?
$hasBadToken = $phpcsFile->findNext($disallowedTokens, $start, $end);
if ($hasBadToken === false) {
return true;
}
// If there are also bracket tokens, the disallowed token might be part of a variable
// variable, but if there are no bracket tokens, we know we have an error.
$hasBrackets = $phpcsFile->findNext($bracketTokens, $start, $end);
if ($hasBrackets === false) {
return false;
}
// Ok, we have both a disallowed token as well as brackets, so we need to walk
// the tokens of the variable variable.
for ($i = $start; $i < $end; $i++) {
// If this is a bracket token, skip to the end of the bracketed expression.
if (isset($bracketTokens[$tokens[$i]['code']], $tokens[$i]['bracket_closer'])) {
$i = $tokens[$i]['bracket_closer'];
continue;
}
// If it's a disallowed token, not within brackets, we have an error.
if (isset($disallowedTokens[$tokens[$i]['code']])) {
return false;
}
}
return true;
}
}