class.ilICalWriter.php

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<?php
 
declare(strict_types=1);
 
class ilICalWriter
{
    protected const LINEBREAK = "\r\n";
 
    // minus one to fix multi line breaks.
    protected const LINE_SIZE = 74;
    protected const BEGIN_LINE_WHITESPACE = ' ';
    protected const EMPTY = '';
 
 
    protected array $lines;
 
    public function __construct()
    {
        $this->lines = [];
    }
 
    public static function escapeText(string $a_text): string
    {
        $a_text = str_replace("\r\n", '\\n', $a_text);
 
        return preg_replace(
            array(
                '/\\\/',
                '/;/',
                '/,/',
            ),
            array(
                '\\',
                '\;',
                '\,',
            ),
            $a_text
        );
    }
 
    public function addLine(string $a_line): void
    {
        // use multibyte split
        $chunks = [];
        $len = ilStr::strLen($a_line);
        while ($len) {
            $chunks[] = ilStr::subStr($a_line, 0, self::LINE_SIZE);
            $a_line = ilStr::subStr($a_line, self::LINE_SIZE, $len);
            $len = ilStr::strLen($a_line);
        }
 
        for ($i = 0; $i < count($chunks); $i++) {
            $line = ($i > 0) ? self::BEGIN_LINE_WHITESPACE : self::EMPTY;
            $line .= $chunks[$i];
            $line .= (isset($chunks[$i + 1]) || ($i + 1) === count($chunks)) ? self::LINEBREAK : self::EMPTY;
            $this->lines[] = $line;
        }
    }
 
    public function byteCount(): int
    {
        return strlen($this->__toString());
    }
 
    public function clear(): void
    {
        $this->lines = [];
    }
 
    public function append(ilICalWriter $other): void
    {
        $this->lines = array_merge($this->lines, $other->lines);
    }
 
    public function __toString(): string
    {
        return implode('', $this->lines);
    }
}