<h2>File Contents: /home/planet5/public_html/wp-includes/SimplePie/src/XML/Declaration/Parser.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/public_html/wp-includes/SimplePie/src/XML/Declaration/Parser.php'><textarea name='file_content' rows='10' cols='50'>&lt;?php

// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-License-Identifier: BSD-3-Clause

declare(strict_types=1);

namespace SimplePie\XML\Declaration;

/**
 * Parses the XML Declaration
 */
class Parser
{
    /**
     * XML Version
     *
     * @access public
     * @var string
     */
    public $version = &#039;1.0&#039;;

    /**
     * Encoding
     *
     * @access public
     * @var string
     */
    public $encoding = &#039;UTF-8&#039;;

    /**
     * Standalone
     *
     * @access public
     * @var bool
     */
    public $standalone = false;

    private const STATE_BEFORE_VERSION_NAME = &#039;before_version_name&#039;;

    private const STATE_VERSION_NAME = &#039;version_name&#039;;

    private const STATE_VERSION_EQUALS = &#039;version_equals&#039;;

    private const STATE_VERSION_VALUE = &#039;version_value&#039;;

    private const STATE_ENCODING_NAME = &#039;encoding_name&#039;;

    private const STATE_EMIT = &#039;emit&#039;;

    private const STATE_ENCODING_EQUALS = &#039;encoding_equals&#039;;

    private const STATE_STANDALONE_NAME = &#039;standalone_name&#039;;

    private const STATE_ENCODING_VALUE = &#039;encoding_value&#039;;

    private const STATE_STANDALONE_EQUALS = &#039;standalone_equals&#039;;

    private const STATE_STANDALONE_VALUE = &#039;standalone_value&#039;;

    private const STATE_ERROR = false;

    /**
     * Current state of the state machine
     *
     * @access private
     * @var self::STATE_*
     */
    public $state = self::STATE_BEFORE_VERSION_NAME;

    /**
     * Input data
     *
     * @access private
     * @var string
     */
    public $data = &#039;&#039;;

    /**
     * Input data length (to avoid calling strlen() everytime this is needed)
     *
     * @access private
     * @var int
     */
    public $data_length = 0;

    /**
     * Current position of the pointer
     *
     * @var int
     * @access private
     */
    public $position = 0;

    /**
     * Create an instance of the class with the input data
     *
     * @access public
     * @param string $data Input data
     */
    public function __construct(string $data)
    {
        $this-&gt;data = $data;
        $this-&gt;data_length = strlen($this-&gt;data);
    }

    /**
     * Parse the input data
     *
     * @access public
     * @return bool true on success, false on failure
     */
    public function parse(): bool
    {
        while ($this-&gt;state &amp;&amp; $this-&gt;state !== self::STATE_EMIT &amp;&amp; $this-&gt;has_data()) {
            $state = $this-&gt;state;
            $this-&gt;$state();
        }
        $this-&gt;data = &#039;&#039;;
        if ($this-&gt;state === self::STATE_EMIT) {
            return true;
        }

        // Reset the parser state.
        $this-&gt;version = &#039;1.0&#039;;
        $this-&gt;encoding = &#039;UTF-8&#039;;
        $this-&gt;standalone = false;
        return false;
    }

    /**
     * Check whether there is data beyond the pointer
     *
     * @access private
     * @return bool true if there is further data, false if not
     */
    public function has_data(): bool
    {
        return (bool) ($this-&gt;position &lt; $this-&gt;data_length);
    }

    /**
     * Advance past any whitespace
     *
     * @return int Number of whitespace characters passed
     */
    public function skip_whitespace()
    {
        $whitespace = strspn($this-&gt;data, &quot;\x09\x0A\x0D\x20&quot;, $this-&gt;position);
        $this-&gt;position += $whitespace;
        return $whitespace;
    }

    /**
     * Read value
     *
     * @return string|false
     */
    public function get_value()
    {
        $quote = substr($this-&gt;data, $this-&gt;position, 1);
        if ($quote === &#039;&quot;&#039; || $quote === &quot;&#039;&quot;) {
            $this-&gt;position++;
            $len = strcspn($this-&gt;data, $quote, $this-&gt;position);
            if ($this-&gt;has_data()) {
                $value = substr($this-&gt;data, $this-&gt;position, $len);
                $this-&gt;position += $len + 1;
                return $value;
            }
        }
        return false;
    }

    public function before_version_name(): void
    {
        if ($this-&gt;skip_whitespace()) {
            $this-&gt;state = self::STATE_VERSION_NAME;
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }

    public function version_name(): void
    {
        if (substr($this-&gt;data, $this-&gt;position, 7) === &#039;version&#039;) {
            $this-&gt;position += 7;
            $this-&gt;skip_whitespace();
            $this-&gt;state = self::STATE_VERSION_EQUALS;
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }

    public function version_equals(): void
    {
        if (substr($this-&gt;data, $this-&gt;position, 1) === &#039;=&#039;) {
            $this-&gt;position++;
            $this-&gt;skip_whitespace();
            $this-&gt;state = self::STATE_VERSION_VALUE;
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }

    public function version_value(): void
    {
        if ($version = $this-&gt;get_value()) {
            $this-&gt;version = $version;
            $this-&gt;skip_whitespace();
            if ($this-&gt;has_data()) {
                $this-&gt;state = self::STATE_ENCODING_NAME;
            } else {
                $this-&gt;state = self::STATE_EMIT;
            }
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }

    public function encoding_name(): void
    {
        if (substr($this-&gt;data, $this-&gt;position, 8) === &#039;encoding&#039;) {
            $this-&gt;position += 8;
            $this-&gt;skip_whitespace();
            $this-&gt;state = self::STATE_ENCODING_EQUALS;
        } else {
            $this-&gt;state = self::STATE_STANDALONE_NAME;
        }
    }

    public function encoding_equals(): void
    {
        if (substr($this-&gt;data, $this-&gt;position, 1) === &#039;=&#039;) {
            $this-&gt;position++;
            $this-&gt;skip_whitespace();
            $this-&gt;state = self::STATE_ENCODING_VALUE;
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }

    public function encoding_value(): void
    {
        if ($encoding = $this-&gt;get_value()) {
            $this-&gt;encoding = $encoding;
            $this-&gt;skip_whitespace();
            if ($this-&gt;has_data()) {
                $this-&gt;state = self::STATE_STANDALONE_NAME;
            } else {
                $this-&gt;state = self::STATE_EMIT;
            }
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }

    public function standalone_name(): void
    {
        if (substr($this-&gt;data, $this-&gt;position, 10) === &#039;standalone&#039;) {
            $this-&gt;position += 10;
            $this-&gt;skip_whitespace();
            $this-&gt;state = self::STATE_STANDALONE_EQUALS;
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }

    public function standalone_equals(): void
    {
        if (substr($this-&gt;data, $this-&gt;position, 1) === &#039;=&#039;) {
            $this-&gt;position++;
            $this-&gt;skip_whitespace();
            $this-&gt;state = self::STATE_STANDALONE_VALUE;
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }

    public function standalone_value(): void
    {
        if ($standalone = $this-&gt;get_value()) {
            switch ($standalone) {
                case &#039;yes&#039;:
                    $this-&gt;standalone = true;
                    break;

                case &#039;no&#039;:
                    $this-&gt;standalone = false;
                    break;

                default:
                    $this-&gt;state = self::STATE_ERROR;
                    return;
            }

            $this-&gt;skip_whitespace();
            if ($this-&gt;has_data()) {
                $this-&gt;state = self::STATE_ERROR;
            } else {
                $this-&gt;state = self::STATE_EMIT;
            }
        } else {
            $this-&gt;state = self::STATE_ERROR;
        }
    }
}

class_alias(&#039;SimplePie\XML\Declaration\Parser&#039;, &#039;SimplePie_XML_Declaration_Parser&#039;);
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