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<?php /** * SCSSPHP * * @copyright 2012-2020 Leaf Corcoran * * @license http://opensource.org/licenses/MIT MIT * * @link http://scssphp.github.io/scssphp / namespace ScssPhp\ScssPhp\Function; use ScssPhp\ScssPhp\Util\StringUtil; use ScssPhp\ScssPhp\Value\SassNull; use ScssPhp\ScssPhp\Value\SassNumber; use ScssPhp\ScssPhp\Value\SassString; use ScssPhp\ScssPhp\Value\Value; /* * @internal / final class StringFunctions { private static ?int $previousId = null; /* * @param list<Value> $arguments / public static function unquote(array $arguments): Value { $string = $arguments[0]->assertString('string'); if (!$string->hasQuotes()) { return $string; } return new SassString($string->getText(), false); } /* * @param list<Value> $arguments / public static function quote(array $arguments): Value { $string = $arguments[0]->assertString('string'); if ($string->hasQuotes()) { return $string; } return new SassString($string->getText(), true); } /* * @param list<Value> $arguments / public static function length(array $arguments): Value { $string = $arguments[0]->assertString('string'); return SassNumber::create($string->getSassLength()); } /* * @param list<Value> $arguments / public static function insert(array $arguments): Value { $string = $arguments[0]->assertString('string'); $insert = $arguments[1]->assertString('insert'); $index = $arguments[2]->assertNumber('index'); $index->assertNoUnits('index'); $indexInt = $index->assertInt('index'); // str-insert has unusual behavior for negative inputs. It guarantees that // the `$insert` string is at `$index` in the result, which means that we // want to insert before `$index` if it's positive and after if it's // negative. if ($indexInt < 0) { // +1 because negative indexes start counting from -1 rather than 0, and // another +1 because we want to insert after* that index. $indexInt = max($string->getSassLength() + $indexInt + 2, 0); } $codepointIndex = self::codepointForIndex($indexInt, $string->getSassLength()); return new SassString( mb_substr($string->getText(), 0, $codepointIndex) . $insert->getText() . mb_substr($string->getText(), $codepointIndex), $string->hasQuotes() ); } /** * @param list<Value> $arguments / public static function index(array $arguments): Value { $string = $arguments[0]->assertString('string'); $substring = $arguments[1]->assertString('substring'); $codepointIndex = mb_strpos($string->getText(), $substring->getText()); if ($codepointIndex === false) { return SassNull::create(); } return SassNumber::create($codepointIndex + 1); } /* * @param list<Value> $arguments / public static function slice(array $arguments): Value { $string = $arguments[0]->assertString('string'); $start = $arguments[1]->assertNumber('start-at'); $end = $arguments[2]->assertNumber('end-at'); $start->assertNoUnits('start-at'); $end->assertNoUnits('end-at'); $lengthInCodepoints = $string->getSassLength(); // No matter what the start index is, an end index of 0 will produce an // empty string. $endInt = $end->assertInt(); if ($endInt === 0) { return new SassString('', $string->hasQuotes()); } $startCodepoint = self::codepointForIndex($start->assertInt(), $lengthInCodepoints); $endCodepoint = self::codepointForIndex($endInt, $lengthInCodepoints, true); if ($endCodepoint === $lengthInCodepoints) { $endCodepoint--; } if ($endCodepoint < $startCodepoint) { return new SassString('', $string->hasQuotes()); } return new SassString( mb_substr($string->getText(), $startCodepoint, $endCodepoint + 1 - $startCodepoint), $string->hasQuotes() ); } /* * @param list<Value> $arguments / public static function toUpperCase(array $arguments): Value { $string = $arguments[0]->assertString('string'); return new SassString(StringUtil::toAsciiUpperCase($string->getText()), $string->hasQuotes()); } /* * @param list<Value> $arguments / public static function toLowerCase(array $arguments): Value { $string = $arguments[0]->assertString('string'); return new SassString(StringUtil::toAsciiLowerCase($string->getText()), $string->hasQuotes()); } /* * @param list<Value> $arguments / public static function uniqueId(array $arguments): Value { if (self::$previousId === null) { self::$previousId = random_int(0, 36 * 6); } // Make it difficult to guess the next ID by randomizing the increase. self::$previousId += random_int(0, 36) + 1; if (self::$previousId > 36 6) { self::$previousId %= 36 6; } // The leading "u" ensures that the result is a valid identifier. return new SassString('u' . str_pad(base_convert((string) self::$previousId, 10, 36), 6, '0', STR_PAD_LEFT), false); } /** * Converts a Sass string index into a codepoint index into a string which * has length $lengthInCodepoints measured in codepoints (with `mb_strlen`). * * A Sass string index is one-based, and uses negative numbers to count * backwards from the end of the string. * * If $index is negative and it points before the beginning of * $lengthInCodepoints, this will return `0` if $allowNegative is `false` and * the index if it's `true`. */ private static function codepointForIndex(int $index, int $lengthInCodepoints, bool $allowNegative = false): int { if ($index === 0) { return 0; } if ($index > 0) { return min($index - 1, $lengthInCodepoints); } $result = $lengthInCodepoints + $index; if ($result < 0 && !$allowNegative) { return 0; } return $result; } }

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