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Editing: Parser.php
<?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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