Summery Summery
Parses the XML Declaration
Syntax Syntax
Source Source
File: wp-includes/SimplePie/XML/Declaration/Parser.php
{ /** * XML Version * * @access public * @var string */ var $version = '1.0'; /** * Encoding * * @access public * @var string */ var $encoding = 'UTF-8'; /** * Standalone * * @access public * @var bool */ var $standalone = false; /** * Current state of the state machine * * @access private * @var string */ var $state = 'before_version_name'; /** * Input data * * @access private * @var string */ var $data = ''; /** * Input data length (to avoid calling strlen() everytime this is needed) * * @access private * @var int */ var $data_length = 0; /** * Current position of the pointer * * @var int * @access private */ var $position = 0; /** * Create an instance of the class with the input data * * @access public * @param string $data Input data */ public function __construct($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() { while ($this->state && $this->state !== 'emit' && $this->has_data()) { $state = $this->state; $this->$state(); } $this->data = ''; if ($this->state === 'emit') { return true; } $this->version = ''; $this->encoding = ''; $this->standalone = ''; return false; } /** * Check whether there is data beyond the pointer * * @access private * @return bool true if there is further data, false if not */ public function has_data() { return (bool) ($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 */ 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 $value; } } return false; } public function before_version_name() { if ($this->skip_whitespace()) { $this->state = 'version_name'; } else { $this->state = false; } } public function version_name() { if (substr($this->data, $this->position, 7) === 'version') { $this->position += 7; $this->skip_whitespace(); $this->state = 'version_equals'; } else { $this->state = false; } } public function version_equals() { if (substr($this->data, $this->position, 1) === '=') { $this->position++; $this->skip_whitespace(); $this->state = 'version_value'; } else { $this->state = false; } } public function version_value() { if ($this->version = $this->get_value()) { $this->skip_whitespace(); if ($this->has_data()) { $this->state = 'encoding_name'; } else { $this->state = 'emit'; } } else { $this->state = false; } } public function encoding_name() { if (substr($this->data, $this->position, 8) === 'encoding') { $this->position += 8; $this->skip_whitespace(); $this->state = 'encoding_equals'; } else { $this->state = 'standalone_name'; } } public function encoding_equals() { if (substr($this->data, $this->position, 1) === '=') { $this->position++; $this->skip_whitespace(); $this->state = 'encoding_value'; } else { $this->state = false; } } public function encoding_value() { if ($this->encoding = $this->get_value()) { $this->skip_whitespace(); if ($this->has_data()) { $this->state = 'standalone_name'; } else { $this->state = 'emit'; } } else { $this->state = false; } } public function standalone_name() { if (substr($this->data, $this->position, 10) === 'standalone') { $this->position += 10; $this->skip_whitespace(); $this->state = 'standalone_equals'; } else { $this->state = false; } } public function standalone_equals() { if (substr($this->data, $this->position, 1) === '=') { $this->position++; $this->skip_whitespace(); $this->state = 'standalone_value'; } else { $this->state = false; } } public function standalone_value() { if ($standalone = $this->get_value()) { switch ($standalone) { case 'yes': $this->standalone = true; break; case 'no': $this->standalone = false; break; default: $this->state = false; return; } $this->skip_whitespace(); if ($this->has_data()) { $this->state = false; } else { $this->state = 'emit'; } } else { $this->state = false; } } }