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Edit File : Parser.php \| Size : 7.56 KB
<?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 = '1.0'; /* * Encoding * * @access public * @var string / public $encoding = 'UTF-8'; /* * Standalone * * @access public * @var bool / public $standalone = false; private const STATE_BEFORE_VERSION_NAME = 'before_version_name'; private const STATE_VERSION_NAME = 'version_name'; private const STATE_VERSION_EQUALS = 'version_equals'; private const STATE_VERSION_VALUE = 'version_value'; private const STATE_ENCODING_NAME = 'encoding_name'; private const STATE_EMIT = 'emit'; private const STATE_ENCODING_EQUALS = 'encoding_equals'; private const STATE_STANDALONE_NAME = 'standalone_name'; private const STATE_ENCODING_VALUE = 'encoding_value'; private const STATE_STANDALONE_EQUALS = 'standalone_equals'; private const STATE_STANDALONE_VALUE = 'standalone_value'; 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 = ''; /* * 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->data = $data; $this->data_length = strlen($this->data); } /* * Parse the input data * * @access public * @return bool true on success, false on failure / public function parse(): bool { while ($this->state && $this->state !== self::STATE_EMIT && $this->has_data()) { $state = $this->state; $this->$state(); } $this->data = ''; if ($this->state === self::STATE_EMIT) { return true; } // Reset the parser state. $this->version = '1.0'; $this->encoding = 'UTF-8'; $this->standalone = false; return false; } /* * Check whether there is data beyond the pointer * * @access private * @return bool true if there is further data, false if not / public function has_data(): bool { return (bool) ($this->position < $this->data_length); } /* * Advance past any whitespace * * @return int Number of whitespace characters passed / public function skip_whitespace() { $whitespace = strspn($this->data, "\x09\x0A\x0D\x20", $this->position); $this->position += $whitespace; return $whitespace; } /* * Read value * * @return string\|false */ public function get_value() { $quote = substr($this->data, $this->position, 1); if ($quote === '"' \|\| $quote === "'") { $this->position++; $len = strcspn($this->data, $quote, $this->position); if ($this->has_data()) { $value = substr($this->data, $this->position, $len); $this->position += $len + 1; return $value; } } return false; } public function before_version_name(): void { if ($this->skip_whitespace()) { $this->state = self::STATE_VERSION_NAME; } else { $this->state = self::STATE_ERROR; } } public function version_name(): void { if (substr($this->data, $this->position, 7) === 'version') { $this->position += 7; $this->skip_whitespace(); $this->state = self::STATE_VERSION_EQUALS; } else { $this->state = self::STATE_ERROR; } } public function version_equals(): void { if (substr($this->data, $this->position, 1) === '=') { $this->position++; $this->skip_whitespace(); $this->state = self::STATE_VERSION_VALUE; } else { $this->state = self::STATE_ERROR; } } public function version_value(): void { if ($version = $this->get_value()) { $this->version = $version; $this->skip_whitespace(); if ($this->has_data()) { $this->state = self::STATE_ENCODING_NAME; } else { $this->state = self::STATE_EMIT; } } else { $this->state = self::STATE_ERROR; } } public function encoding_name(): void { if (substr($this->data, $this->position, 8) === 'encoding') { $this->position += 8; $this->skip_whitespace(); $this->state = self::STATE_ENCODING_EQUALS; } else { $this->state = self::STATE_STANDALONE_NAME; } } public function encoding_equals(): void { if (substr($this->data, $this->position, 1) === '=') { $this->position++; $this->skip_whitespace(); $this->state = self::STATE_ENCODING_VALUE; } else { $this->state = self::STATE_ERROR; } } public function encoding_value(): void { if ($encoding = $this->get_value()) { $this->encoding = $encoding; $this->skip_whitespace(); if ($this->has_data()) { $this->state = self::STATE_STANDALONE_NAME; } else { $this->state = self::STATE_EMIT; } } else { $this->state = self::STATE_ERROR; } } public function standalone_name(): void { if (substr($this->data, $this->position, 10) === 'standalone') { $this->position += 10; $this->skip_whitespace(); $this->state = self::STATE_STANDALONE_EQUALS; } else { $this->state = self::STATE_ERROR; } } public function standalone_equals(): void { if (substr($this->data, $this->position, 1) === '=') { $this->position++; $this->skip_whitespace(); $this->state = self::STATE_STANDALONE_VALUE; } else { $this->state = self::STATE_ERROR; } } public function standalone_value(): void { if ($standalone = $this->get_value()) { switch ($standalone) { case 'yes': $this->standalone = true; break; case 'no': $this->standalone = false; break; default: $this->state = self::STATE_ERROR; return; } $this->skip_whitespace(); if ($this->has_data()) { $this->state = self::STATE_ERROR; } else { $this->state = self::STATE_EMIT; } } else { $this->state = self::STATE_ERROR; } } } class_alias('SimplePie\XML\Declaration\Parser', 'SimplePie_XML_Declaration_Parser'); Back

Edit File : Parser.php | Size : 7.56 KB

<?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 = '1.0';

/**
     * Encoding
     *
     * @access public
     * @var string
     */
    public $encoding = 'UTF-8';

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

private const STATE_BEFORE_VERSION_NAME = 'before_version_name';

private const STATE_VERSION_NAME = 'version_name';

private const STATE_VERSION_EQUALS = 'version_equals';

private const STATE_VERSION_VALUE = 'version_value';

private const STATE_ENCODING_NAME = 'encoding_name';

private const STATE_EMIT = 'emit';

private const STATE_ENCODING_EQUALS = 'encoding_equals';

private const STATE_STANDALONE_NAME = 'standalone_name';

private const STATE_ENCODING_VALUE = 'encoding_value';

private const STATE_STANDALONE_EQUALS = 'standalone_equals';

private const STATE_STANDALONE_VALUE = 'standalone_value';

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 = '';

/**
     * 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->data = $data;
        $this->data_length = strlen($this->data);
    }

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

// Reset the parser state.
        $this->version = '1.0';
        $this->encoding = 'UTF-8';
        $this->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->position < $this->data_length);
    }

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

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

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

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

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

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

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

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

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

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

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

public function standalone_value(): void
    {
        if ($standalone = $this->get_value()) {
            switch ($standalone) {
                case 'yes':
                    $this->standalone = true;
                    break;

case 'no':
                    $this->standalone = false;
                    break;

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

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

class_alias('SimplePie\XML\Declaration\Parser', 'SimplePie_XML_Declaration_Parser');

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