/**
* 「ああ」「あい」のように組み合わせた2文字のひらがなによる配列を返します。
* @return string[] 要素の数は500以上。
*/
protected function generateHiraganaWords() : array
{
if ($this->hiraganaWords) {
return $this->hiraganaWords;
}
for ($i = \IntlChar::ord('ぁ'), $l = $i + sqrt(500); $i < $l; $i++) {
$firsts[] = \IntlChar::chr($i);
}
$seconds = $firsts;
foreach ($firsts as $first) {
foreach ($seconds as $second) {
$this->hiraganaWords[] = "{$first}{$second}";
}
}
return $this->hiraganaWords;
}
/**
* スペースを除くASCII印字可能文字を、対応する全角形に置き換えます。
* @param string $str
* @return string
*/
protected function convertToFullwidth(string $str) : string
{
return preg_replace_callback('/[!-~]/u', function (array $matches) : string {
return \IntlChar::chr(\IntlChar::ord($matches[0]) - (\IntlChar::ord('!') - \IntlChar::ord('！')));
}, $str);
}
/**
* 入力を妥当な拡張子を除くファイル名に変換します。
* @param string $filenameWithoutExtension NFC適用済みの拡張子を除くファイル名。
* @return string 制御文字、および空白文字のみで構成されていた場合、ランダムな文字列生成します。
*/
public function convertToValidFilenameWithoutExtension(string $filenameWithoutExtension) : string
{
/** @var string 制御文字、先頭末尾の空白を取り除いた文字列。 */
$trimed = preg_replace('/^\\p{Z}+|\\p{C}+|\\p{Z}+$/u', '', $filenameWithoutExtension);
return $trimed === '' ? (new FilenameValidator())->generateRandomFilename() : preg_replace_callback('/^(CON|PRN|AUX|CLOCK\\$|NUL|(COM|LPT)[1-9])$|["*.\\/:<>?\\\\|]+/i', function (array $matches) : string {
$breakIterator = \IntlCodePointBreakIterator::createCodePointInstance();
$breakIterator->setText($matches[0]);
$fullWidthChars = '';
foreach ($breakIterator as $index) {
if ($index > 0) {
$fullWidthChars .= \IntlChar::chr($breakIterator->getLastCodePoint() + self::BETWEEN_HALF_AND_FULL);
}
}
return $fullWidthChars;
}, $trimed);
}
/**
* Scans a single UTF-8 encoded Unicode codepoint, which can be up to four
* bytes long.
*
* 0xxx xxxx Single-byte codepoint.
* 110x xxxx First of a two-byte codepoint.
* 1110 xxxx First of three.
* 1111 0xxx First of four.
* 10xx xxxx A continuation of any of the three preceding.
*
* @see https://en.wikipedia.org/wiki/UTF-8#Description
* @see http://www.unicode.org/versions/Unicode9.0.0/ch03.pdf#page=54
*
* @param string $byte Initial byte. The bytestream cursor starts one
* position ahead of this.
* @return string The scanned codepoint.
* @throws ParseException on ill-formed UTF-8.
*/
private function scanCodepoint(string $byte) : string
{
$bytes = $this->byteIterator;
$codepoint = $byte;
$ord = ord($codepoint);
if (!($ord >> 7)) {
return $codepoint;
} elseif (!($ord >> 5 ^ 0b110)) {
$expect = 1;
} elseif (!($ord >> 4 ^ 0b1110)) {
$expect = 2;
} elseif (!($ord >> 3 ^ 0b11110)) {
$expect = 3;
} else {
$expect = 0;
// This'll throw in just a moment.
}
while ($bytes->valid() && $expect > 0) {
$byte = $bytes->current();
if (ord($byte) >> 6 ^ 0b10) {
break;
}
$codepoint .= $byte;
$bytes->next();
$expect--;
}
$chr = \IntlChar::chr($codepoint);
if ($chr === null) {
throw new ParseException(sprintf("Line %d: Ill-formed UTF-8 sequence" . str_repeat(" 0x%X", strlen($codepoint)) . ".", $this->getLineNumber(), ...array_map("ord", str_split($codepoint))));
}
return $chr;
}
