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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Yaml;

/**
 * Dumper dumps PHP variables to YAML strings.
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * @final
 */
class Dumper
{
    /**
     * The amount of spaces to use for indentation of nested nodes.
     *
     * @var int
     */
    protected $indentation;

    public function __construct(int $indentation = 4)
    {
        if ($indentation &lt; 1) {
            throw new \InvalidArgumentException(&#039;The indentation must be greater than zero.&#039;);
        }

        $this-&gt;indentation = $indentation;
    }

    /**
     * Dumps a PHP value to YAML.
     *
     * @param mixed $input  The PHP value
     * @param int   $inline The level where you switch to inline YAML
     * @param int   $indent The level of indentation (used internally)
     * @param int   $flags  A bit field of Yaml::DUMP_* constants to customize the dumped YAML string
     *
     * @return string The YAML representation of the PHP value
     */
    public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0): string
    {
        $output = &#039;&#039;;
        $prefix = $indent ? str_repeat(&#039; &#039;, $indent) : &#039;&#039;;
        $dumpObjectAsInlineMap = true;

        if (Yaml::DUMP_OBJECT_AS_MAP &amp; $flags &amp;&amp; ($input instanceof \ArrayObject || $input instanceof \stdClass)) {
            $dumpObjectAsInlineMap = empty((array) $input);
        }

        if ($inline &lt;= 0 || (!is_array($input) &amp;&amp; $dumpObjectAsInlineMap) || empty($input)) {
            $output .= $prefix.Inline::dump($input, $flags);
        } else {
            $dumpAsMap = Inline::isHash($input);

            foreach ($input as $key =&gt; $value) {
                if ($inline &gt;= 1 &amp;&amp; Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK &amp; $flags &amp;&amp; is_string($value) &amp;&amp; false !== strpos($value, &quot;\n&quot;) &amp;&amp; false === strpos($value, &quot;\r\n&quot;)) {
                    // If the first line starts with a space character, the spec requires a blockIndicationIndicator
                    // http://www.yaml.org/spec/1.2/spec.html#id2793979
                    $blockIndentationIndicator = (&#039; &#039; === substr($value, 0, 1)) ? (string) $this-&gt;indentation : &#039;&#039;;
                    $output .= sprintf(&quot;%s%s%s |%s\n&quot;, $prefix, $dumpAsMap ? Inline::dump($key, $flags).&#039;:&#039; : &#039;-&#039;, &#039;&#039;, $blockIndentationIndicator);

                    foreach (preg_split(&#039;/\n|\r\n/&#039;, $value) as $row) {
                        $output .= sprintf(&quot;%s%s%s\n&quot;, $prefix, str_repeat(&#039; &#039;, $this-&gt;indentation), $row);
                    }

                    continue;
                }

                $dumpObjectAsInlineMap = true;

                if (Yaml::DUMP_OBJECT_AS_MAP &amp; $flags &amp;&amp; ($value instanceof \ArrayObject || $value instanceof \stdClass)) {
                    $dumpObjectAsInlineMap = empty((array) $value);
                }

                $willBeInlined = $inline - 1 &lt;= 0 || !is_array($value) &amp;&amp; $dumpObjectAsInlineMap || empty($value);

                $output .= sprintf(&#039;%s%s%s%s&#039;,
                    $prefix,
                    $dumpAsMap ? Inline::dump($key, $flags).&#039;:&#039; : &#039;-&#039;,
                    $willBeInlined ? &#039; &#039; : &quot;\n&quot;,
                    $this-&gt;dump($value, $inline - 1, $willBeInlined ? 0 : $indent + $this-&gt;indentation, $flags)
                ).($willBeInlined ? &quot;\n&quot; : &#039;&#039;);
            }
        }

        return $output;
    }
}
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