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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\Util;
use ScssPhp\ScssPhp\Parser\StringScanner;
use ScssPhp\ScssPhp\SourceSpan\FileSpan;
/**
* @internal
*/
final class SpanUtil
{
/**
* Returns this span with all whitespace trimmed from both sides.
*/
public static function trim(FileSpan $span): FileSpan
{
return self::trimRight(self::trimLeft($span));
}
/**
* Returns this span with all leading whitespace trimmed.
*/
public static function trimLeft(FileSpan $span): FileSpan
{
$start = 0;
$text = $span->getText();
$textLength = \strlen($text);
while ($start < $textLength && Character::isWhitespace($text[$start])) {
$start++;
}
return $span->subspan($start);
}
/**
* Returns this span with all trailing whitespace trimmed.
*/
public static function trimRight(FileSpan $span): FileSpan
{
$text = $span->getText();
$end = \strlen($text) - 1;
while ($end >= 0 && Character::isWhitespace($text[$end])) {
$end--;
}
return $span->subspan(0, $end + 1);
}
/**
* Returns the span of the identifier at the start of this span.
*
* If $includeLeading is greater than 0, that many additional characters
* will be included from the start of this span before looking for an
* identifier.
*/
public static function initialIdentifier(FileSpan $span, int $includeLeading = 0): FileSpan
{
$scanner = new StringScanner($span->getText());
for ($i = 0; $i < $includeLeading; $i++) {
$scanner->readUtf8Char();
}
self::scanIdentifier($scanner);
return $span->subspan(0, $scanner->getPosition());
}
/**
* Returns a subspan excluding the identifier at the start of this span.
*/
public static function withoutInitialIdentifier(FileSpan $span): FileSpan
{
$scanner = new StringScanner($span->getText());
self::scanIdentifier($scanner);
return $span->subspan($scanner->getPosition());
}
/**
* Returns a subspan excluding a namespace and `.` at the start of this span.
*/
public static function withoutNamespace(FileSpan $span): FileSpan
{
return self::withoutInitialIdentifier($span)->subspan(1);
}
/**
* Returns a subspan excluding an initial at-rule and any whitespace after
* it.
*/
public static function withoutInitialAtRule(FileSpan $span): FileSpan
{
$scanner = new StringScanner($span->getText());
$scanner->expectChar('@');
self::scanIdentifier($scanner);
return self::trimLeft($span->subspan($scanner->getPosition()));
}
/**
* Whether $span contains the $target FileSpan.
*
* Validates the FileSpans to be in the same file and for the $target to be
* within $span FileSpan inclusive range [start,end].
*/
public static function contains(FileSpan $span, FileSpan $target): bool
{
return $span->getFile() === $target->getFile() && $span->getStart()->getOffset() <= $target->getStart()->getOffset() && $span->getEnd()->getOffset() >= $target->getEnd()->getOffset();
}
/**
* Consumes an identifier from $scanner.
*/
private static function scanIdentifier(StringScanner $scanner): void
{
while (!$scanner->isDone()) {
$char = $scanner->peekChar();
if ($char === '\\') {
ParserUtil::consumeEscapedCharacter($scanner);
} elseif ($char !== null && Character::isName($char)) {
$scanner->readUtf8Char();
} else {
break;
}
}
}
}
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