mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
765 lines
25 KiB
PHP
765 lines
25 KiB
PHP
<?php
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/**
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* base include file for SimpleTest
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* @package SimpleTest
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* @subpackage MockObjects
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* @version $Id: parser.php 1723 2008-04-08 00:34:10Z lastcraft $
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*/
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/**#@+
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* Lexer mode stack constants
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*/
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foreach (array('LEXER_ENTER', 'LEXER_MATCHED',
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'LEXER_UNMATCHED', 'LEXER_EXIT',
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'LEXER_SPECIAL') as $i => $constant) {
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if (! defined($constant)) {
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define($constant, $i + 1);
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}
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}
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/**#@-*/
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/**
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* Compounded regular expression. Any of
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* the contained patterns could match and
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* when one does, it's label is returned.
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* @package SimpleTest
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* @subpackage WebTester
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*/
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class ParallelRegex {
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var $_patterns;
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var $_labels;
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var $_regex;
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var $_case;
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/**
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* Constructor. Starts with no patterns.
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* @param boolean $case True for case sensitive, false
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* for insensitive.
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* @access public
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*/
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function __construct($case) {
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$this->_case = $case;
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$this->_patterns = array();
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$this->_labels = array();
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$this->_regex = null;
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}
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/**
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* Adds a pattern with an optional label.
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* @param string $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param string $label Label of regex to be returned
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* on a match.
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* @access public
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*/
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function addPattern($pattern, $label = true) {
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$count = count($this->_patterns ?? []);
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$this->_patterns[$count] = $pattern;
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$this->_labels[$count] = $label;
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$this->_regex = null;
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}
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/**
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* Attempts to match all patterns at once against
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* a string.
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* @param string $subject String to match against.
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* @param string $match First matched portion of
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* subject.
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* @return boolean True on success.
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* @access public
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*/
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function match($subject, &$match) {
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if (count($this->_patterns ?? []) == 0) {
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return false;
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}
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if (! preg_match($this->_getCompoundedRegex() ?? '', $subject ?? '', $matches)) {
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$match = '';
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return false;
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}
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$match = $matches[0];
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for ($i = 1; $i < count($matches ?? []); $i++) {
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if ($matches[$i]) {
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return $this->_labels[$i - 1];
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}
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}
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return true;
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}
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/**
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* Compounds the patterns into a single
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* regular expression separated with the
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* "or" operator. Caches the regex.
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* Will automatically escape (, ) and / tokens.
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* @param array $patterns List of patterns in order.
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* @access private
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*/
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function _getCompoundedRegex() {
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if ($this->_regex == null) {
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for ($i = 0, $count = count($this->_patterns); $i < $count; $i++) {
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$this->_patterns[$i] = '(' . str_replace(
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array('/', '(', ')'),
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array('\/', '\(', '\)'),
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$this->_patterns[$i] ?? '') . ')';
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}
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$this->_regex = "/" . implode("|", $this->_patterns) . "/" . $this->_getPerlMatchingFlags();
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}
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return $this->_regex;
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}
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/**
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* Accessor for perl regex mode flags to use.
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* @return string Perl regex flags.
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* @access private
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*/
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function _getPerlMatchingFlags() {
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return ($this->_case ? "msS" : "msSi");
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}
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}
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/**
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* States for a stack machine.
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* @package SimpleTest
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* @subpackage WebTester
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*/
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class SimpleStateStack {
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var $_stack;
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/**
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* Constructor. Starts in named state.
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* @param string $start Starting state name.
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* @access public
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*/
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function __construct($start) {
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$this->_stack = array($start);
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}
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/**
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* Accessor for current state.
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* @return string State.
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* @access public
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*/
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function getCurrent() {
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return $this->_stack[count($this->_stack) - 1];
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}
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/**
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* Adds a state to the stack and sets it
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* to be the current state.
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* @param string $state New state.
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* @access public
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*/
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function enter($state) {
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array_push($this->_stack, $state);
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}
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/**
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* Leaves the current state and reverts
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* to the previous one.
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* @return boolean False if we drop off
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* the bottom of the list.
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* @access public
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*/
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function leave() {
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if (count($this->_stack ?? []) == 1) {
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return false;
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}
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array_pop($this->_stack);
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return true;
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}
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}
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/**
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* Accepts text and breaks it into tokens.
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* Some optimisation to make the sure the
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* content is only scanned by the PHP regex
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* parser once. Lexer modes must not start
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* with leading underscores.
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* @package SimpleTest
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* @subpackage WebTester
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*/
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class SimpleLexer {
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var $_regexes;
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var $_parser;
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var $_mode;
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var $_mode_handlers;
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var $_case;
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/**
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* Sets up the lexer in case insensitive matching
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* by default.
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* @param SimpleSaxParser $parser Handling strategy by
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* reference.
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* @param string $start Starting handler.
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* @param boolean $case True for case sensitive.
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* @access public
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*/
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function __construct(&$parser, $start = "accept", $case = false) {
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$this->_case = $case;
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$this->_regexes = array();
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$this->_parser = &$parser;
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$this->_mode = new SimpleStateStack($start);
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$this->_mode_handlers = array($start => $start);
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}
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/**
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* Adds a token search pattern for a particular
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* parsing mode. The pattern does not change the
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* current mode.
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* @param string $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param string $mode Should only apply this
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* pattern when dealing with
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* this type of input.
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* @access public
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*/
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function addPattern($pattern, $mode = "accept") {
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if (! isset($this->_regexes[$mode])) {
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$this->_regexes[$mode] = new ParallelRegex($this->_case);
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}
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$this->_regexes[$mode]->addPattern($pattern);
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if (! isset($this->_mode_handlers[$mode])) {
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$this->_mode_handlers[$mode] = $mode;
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}
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}
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/**
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* Adds a pattern that will enter a new parsing
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* mode. Useful for entering parenthesis, strings,
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* tags, etc.
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* @param string $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param string $mode Should only apply this
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* pattern when dealing with
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* this type of input.
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* @param string $new_mode Change parsing to this new
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* nested mode.
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* @access public
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*/
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function addEntryPattern($pattern, $mode, $new_mode) {
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if (! isset($this->_regexes[$mode])) {
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$this->_regexes[$mode] = new ParallelRegex($this->_case);
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}
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$this->_regexes[$mode]->addPattern($pattern, $new_mode);
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if (! isset($this->_mode_handlers[$new_mode])) {
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$this->_mode_handlers[$new_mode] = $new_mode;
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}
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}
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/**
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* Adds a pattern that will exit the current mode
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* and re-enter the previous one.
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* @param string $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param string $mode Mode to leave.
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* @access public
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*/
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function addExitPattern($pattern, $mode) {
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if (! isset($this->_regexes[$mode])) {
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$this->_regexes[$mode] = new ParallelRegex($this->_case);
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}
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$this->_regexes[$mode]->addPattern($pattern, "__exit");
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if (! isset($this->_mode_handlers[$mode])) {
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$this->_mode_handlers[$mode] = $mode;
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}
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}
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/**
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* Adds a pattern that has a special mode. Acts as an entry
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* and exit pattern in one go, effectively calling a special
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* parser handler for this token only.
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* @param string $pattern Perl style regex, but ( and )
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* lose the usual meaning.
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* @param string $mode Should only apply this
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* pattern when dealing with
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* this type of input.
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* @param string $special Use this mode for this one token.
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* @access public
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*/
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function addSpecialPattern($pattern, $mode, $special) {
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if (! isset($this->_regexes[$mode])) {
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$this->_regexes[$mode] = new ParallelRegex($this->_case);
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}
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$this->_regexes[$mode]->addPattern($pattern, "_$special");
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if (! isset($this->_mode_handlers[$special])) {
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$this->_mode_handlers[$special] = $special;
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}
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}
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/**
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* Adds a mapping from a mode to another handler.
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* @param string $mode Mode to be remapped.
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* @param string $handler New target handler.
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* @access public
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*/
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function mapHandler($mode, $handler) {
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$this->_mode_handlers[$mode] = $handler;
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}
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/**
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* Splits the page text into tokens. Will fail
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* if the handlers report an error or if no
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* content is consumed. If successful then each
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* unparsed and parsed token invokes a call to the
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* held listener.
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* @param string $raw Raw HTML text.
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* @return boolean True on success, else false.
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* @access public
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*/
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function parse($raw) {
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if (! isset($this->_parser)) {
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return false;
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}
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$length = strlen($raw ?? '');
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while (is_array($parsed = $this->_reduce($raw))) {
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list($raw, $unmatched, $matched, $mode) = $parsed;
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if (! $this->_dispatchTokens($unmatched, $matched, $mode)) {
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return false;
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}
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if ($raw === '') {
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return true;
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}
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if (strlen($raw ?? '') == $length) {
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return false;
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}
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$length = strlen($raw ?? '');
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}
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if (! $parsed) {
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return false;
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}
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return $this->_invokeParser($raw, LEXER_UNMATCHED);
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}
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/**
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* Sends the matched token and any leading unmatched
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* text to the parser changing the lexer to a new
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* mode if one is listed.
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* @param string $unmatched Unmatched leading portion.
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* @param string $matched Actual token match.
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* @param string $mode Mode after match. A boolean
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* false mode causes no change.
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* @return boolean False if there was any error
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* from the parser.
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* @access private
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*/
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function _dispatchTokens($unmatched, $matched, $mode = false) {
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if (! $this->_invokeParser($unmatched, LEXER_UNMATCHED)) {
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return false;
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}
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if (is_bool($mode)) {
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return $this->_invokeParser($matched, LEXER_MATCHED);
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}
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if ($this->_isModeEnd($mode)) {
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if (! $this->_invokeParser($matched, LEXER_EXIT)) {
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return false;
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}
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return $this->_mode->leave();
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}
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if ($this->_isSpecialMode($mode)) {
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$this->_mode->enter($this->_decodeSpecial($mode));
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if (! $this->_invokeParser($matched, LEXER_SPECIAL)) {
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return false;
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}
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return $this->_mode->leave();
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}
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$this->_mode->enter($mode);
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return $this->_invokeParser($matched, LEXER_ENTER);
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}
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/**
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* Tests to see if the new mode is actually to leave
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* the current mode and pop an item from the matching
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* mode stack.
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* @param string $mode Mode to test.
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* @return boolean True if this is the exit mode.
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* @access private
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*/
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function _isModeEnd($mode) {
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return ($mode === "__exit");
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}
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/**
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* Test to see if the mode is one where this mode
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* is entered for this token only and automatically
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* leaves immediately afterwoods.
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* @param string $mode Mode to test.
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* @return boolean True if this is the exit mode.
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* @access private
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*/
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function _isSpecialMode($mode) {
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return (strncmp($mode ?? '', "_", 1) == 0);
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}
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/**
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* Strips the magic underscore marking single token
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* modes.
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* @param string $mode Mode to decode.
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* @return string Underlying mode name.
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* @access private
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*/
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function _decodeSpecial($mode) {
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return substr($mode ?? '', 1);
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}
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/**
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* Calls the parser method named after the current
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* mode. Empty content will be ignored. The lexer
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* has a parser handler for each mode in the lexer.
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* @param string $content Text parsed.
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* @param boolean $is_match Token is recognised rather
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* than unparsed data.
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* @access private
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*/
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function _invokeParser($content, $is_match) {
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if (($content === '') || ($content === false)) {
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return true;
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}
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$handler = $this->_mode_handlers[$this->_mode->getCurrent()];
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return $this->_parser->$handler($content, $is_match);
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}
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/**
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* Tries to match a chunk of text and if successful
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* removes the recognised chunk and any leading
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* unparsed data. Empty strings will not be matched.
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* @param string $raw The subject to parse. This is the
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* content that will be eaten.
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* @return array/boolean Three item list of unparsed
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* content followed by the
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* recognised token and finally the
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* action the parser is to take.
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* True if no match, false if there
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* is a parsing error.
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* @access private
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*/
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function _reduce($raw) {
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if ($action = $this->_regexes[$this->_mode->getCurrent()]->match($raw, $match)) {
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$unparsed_character_count = strpos($raw ?? '', $match ?? '');
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$unparsed = substr($raw ?? '', 0, $unparsed_character_count);
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$raw = substr($raw ?? '', $unparsed_character_count + strlen($match ?? ''));
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return array($raw, $unparsed, $match, $action);
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}
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return true;
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}
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}
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/**
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* Breaks HTML into SAX events.
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* @package SimpleTest
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* @subpackage WebTester
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*/
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class SimpleHtmlLexer extends SimpleLexer {
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/**
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* Sets up the lexer with case insensitive matching
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* and adds the HTML handlers.
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* @param SimpleSaxParser $parser Handling strategy by
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* reference.
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* @access public
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*/
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function __construct(&$parser) {
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parent::__construct($parser, 'text');
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$this->mapHandler('text', 'acceptTextToken');
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$this->_addSkipping();
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foreach ($this->_getParsedTags() as $tag) {
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$this->_addTag($tag);
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}
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$this->_addInTagTokens();
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}
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/**
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* List of parsed tags. Others are ignored.
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* @return array List of searched for tags.
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* @access private
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*/
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function _getParsedTags() {
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return array('a', 'base', 'title', 'form', 'input', 'button', 'textarea', 'select',
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'option', 'frameset', 'frame', 'label');
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}
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/**
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* The lexer has to skip certain sections such
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* as server code, client code and styles.
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* @access private
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*/
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function _addSkipping() {
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$this->mapHandler('css', 'ignore');
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$this->addEntryPattern('<style', 'text', 'css');
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$this->addExitPattern('</style>', 'css');
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$this->mapHandler('js', 'ignore');
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$this->addEntryPattern('<script', 'text', 'js');
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$this->addExitPattern('</script>', 'js');
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$this->mapHandler('comment', 'ignore');
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$this->addEntryPattern('<!--', 'text', 'comment');
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$this->addExitPattern('-->', 'comment');
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}
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/**
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* Pattern matches to start and end a tag.
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* @param string $tag Name of tag to scan for.
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* @access private
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*/
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function _addTag($tag) {
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$this->addSpecialPattern("</$tag>", 'text', 'acceptEndToken');
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$this->addEntryPattern("<$tag", 'text', 'tag');
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}
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/**
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* Pattern matches to parse the inside of a tag
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* including the attributes and their quoting.
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* @access private
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*/
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function _addInTagTokens() {
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$this->mapHandler('tag', 'acceptStartToken');
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$this->addSpecialPattern('\s+', 'tag', 'ignore');
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$this->_addAttributeTokens();
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$this->addExitPattern('/>', 'tag');
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$this->addExitPattern('>', 'tag');
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}
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/**
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* Matches attributes that are either single quoted,
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* double quoted or unquoted.
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* @access private
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*/
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function _addAttributeTokens() {
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$this->mapHandler('dq_attribute', 'acceptAttributeToken');
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$this->addEntryPattern('=\s*"', 'tag', 'dq_attribute');
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$this->addPattern("\\\\\"", 'dq_attribute');
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$this->addExitPattern('"', 'dq_attribute');
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$this->mapHandler('sq_attribute', 'acceptAttributeToken');
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$this->addEntryPattern("=\s*'", 'tag', 'sq_attribute');
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$this->addPattern("\\\\'", 'sq_attribute');
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$this->addExitPattern("'", 'sq_attribute');
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$this->mapHandler('uq_attribute', 'acceptAttributeToken');
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$this->addSpecialPattern('=\s*[^>\s]*', 'tag', 'uq_attribute');
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}
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}
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/**
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* Converts HTML tokens into selected SAX events.
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* @package SimpleTest
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* @subpackage WebTester
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*/
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class SimpleHtmlSaxParser {
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var $_lexer;
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var $_listener;
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var $_tag;
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var $_attributes;
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var $_current_attribute;
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/**
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* Sets the listener.
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* @param SimpleSaxListener $listener SAX event handler.
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* @access public
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*/
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function __construct(&$listener) {
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$this->_listener = &$listener;
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$this->_lexer = &$this->createLexer($this);
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$this->_tag = '';
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$this->_attributes = array();
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$this->_current_attribute = '';
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}
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/**
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* Runs the content through the lexer which
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* should call back to the acceptors.
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* @param string $raw Page text to parse.
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* @return boolean False if parse error.
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* @access public
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*/
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function parse($raw) {
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return $this->_lexer->parse($raw);
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}
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/**
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* Sets up the matching lexer. Starts in 'text' mode.
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* @param SimpleSaxParser $parser Event generator, usually $self.
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* @return SimpleLexer Lexer suitable for this parser.
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* @access public
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* @static
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*/
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function &createLexer(&$parser) {
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$lexer = new SimpleHtmlLexer($parser);
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return $lexer;
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}
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|
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/**
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|
* Accepts a token from the tag mode. If the
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* starting element completes then the element
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* is dispatched and the current attributes
|
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* set back to empty. The element or attribute
|
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* name is converted to lower case.
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* @param string $token Incoming characters.
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* @param integer $event Lexer event type.
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* @return boolean False if parse error.
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|
* @access public
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*/
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function acceptStartToken($token, $event) {
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if ($event == LEXER_ENTER) {
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$this->_tag = strtolower(substr($token ?? '', 1));
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return true;
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}
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if ($event == LEXER_EXIT) {
|
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$success = $this->_listener->startElement(
|
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$this->_tag,
|
|
$this->_attributes);
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$this->_tag = '';
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$this->_attributes = array();
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return $success;
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|
}
|
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if ($token != '=') {
|
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$this->_current_attribute = strtolower(SimpleHtmlSaxParser::decodeHtml($token) ?? '');
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$this->_attributes[$this->_current_attribute] = '';
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}
|
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return true;
|
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}
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|
|
|
/**
|
|
* Accepts a token from the end tag mode.
|
|
* The element name is converted to lower case.
|
|
* @param string $token Incoming characters.
|
|
* @param integer $event Lexer event type.
|
|
* @return boolean False if parse error.
|
|
* @access public
|
|
*/
|
|
function acceptEndToken($token, $event) {
|
|
if (! preg_match('/<\/(.*)>/', $token ?? '', $matches)) {
|
|
return false;
|
|
}
|
|
return $this->_listener->endElement(strtolower($matches[1] ?? ''));
|
|
}
|
|
|
|
/**
|
|
* Part of the tag data.
|
|
* @param string $token Incoming characters.
|
|
* @param integer $event Lexer event type.
|
|
* @return boolean False if parse error.
|
|
* @access public
|
|
*/
|
|
function acceptAttributeToken($token, $event) {
|
|
if ($this->_current_attribute) {
|
|
if ($event == LEXER_UNMATCHED) {
|
|
$this->_attributes[$this->_current_attribute] .=
|
|
SimpleHtmlSaxParser::decodeHtml($token);
|
|
}
|
|
if ($event == LEXER_SPECIAL) {
|
|
$this->_attributes[$this->_current_attribute] .=
|
|
preg_replace('/^=\s*/' , '', SimpleHtmlSaxParser::decodeHtml($token) ?? '');
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* A character entity.
|
|
* @param string $token Incoming characters.
|
|
* @param integer $event Lexer event type.
|
|
* @return boolean False if parse error.
|
|
* @access public
|
|
*/
|
|
function acceptEntityToken($token, $event) {
|
|
}
|
|
|
|
/**
|
|
* Character data between tags regarded as
|
|
* important.
|
|
* @param string $token Incoming characters.
|
|
* @param integer $event Lexer event type.
|
|
* @return boolean False if parse error.
|
|
* @access public
|
|
*/
|
|
function acceptTextToken($token, $event) {
|
|
return $this->_listener->addContent($token);
|
|
}
|
|
|
|
/**
|
|
* Incoming data to be ignored.
|
|
* @param string $token Incoming characters.
|
|
* @param integer $event Lexer event type.
|
|
* @return boolean False if parse error.
|
|
* @access public
|
|
*/
|
|
function ignore($token, $event) {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Decodes any HTML entities.
|
|
* @param string $html Incoming HTML.
|
|
* @return string Outgoing plain text.
|
|
* @access public
|
|
* @static
|
|
*/
|
|
static function decodeHtml($html) {
|
|
return html_entity_decode($html ?? '', ENT_QUOTES);
|
|
}
|
|
|
|
/**
|
|
* Turns HTML into text browser visible text. Images
|
|
* are converted to their alt text and tags are supressed.
|
|
* Entities are converted to their visible representation.
|
|
* @param string $html HTML to convert.
|
|
* @return string Plain text.
|
|
* @access public
|
|
* @static
|
|
*/
|
|
static function normalise($html) {
|
|
$text = preg_replace('|<!--.*?-->|', '', $html ?? '');
|
|
$text = preg_replace('|<script[^>]*>.*?</script>|', '', $text ?? '');
|
|
$text = preg_replace('|<img[^>]*alt\s*=\s*"([^"]*)"[^>]*>|', ' \1 ', $text ?? '');
|
|
$text = preg_replace('|<img[^>]*alt\s*=\s*\'([^\']*)\'[^>]*>|', ' \1 ', $text ?? '');
|
|
$text = preg_replace('|<img[^>]*alt\s*=\s*([a-zA-Z_]+)[^>]*>|', ' \1 ', $text ?? '');
|
|
$text = preg_replace('|<[^>]*>|', '', $text ?? '');
|
|
$text = SimpleHtmlSaxParser::decodeHtml($text);
|
|
$text = preg_replace('|\s+|', ' ', $text ?? '');
|
|
return trim(trim($text ?? ''), "\xA0"); // TODO: The \xAO is a . Add a test for this.
|
|
}
|
|
}
|
|
|
|
/**
|
|
* SAX event handler.
|
|
* @package SimpleTest
|
|
* @subpackage WebTester
|
|
* @abstract
|
|
*/
|
|
class SimpleSaxListener {
|
|
|
|
/**
|
|
* Sets the document to write to.
|
|
* @access public
|
|
*/
|
|
function __construct() {
|
|
}
|
|
|
|
/**
|
|
* Start of element event.
|
|
* @param string $name Element name.
|
|
* @param hash $attributes Name value pairs.
|
|
* Attributes without content
|
|
* are marked as true.
|
|
* @return boolean False on parse error.
|
|
* @access public
|
|
*/
|
|
function startElement($name, $attributes) {
|
|
}
|
|
|
|
/**
|
|
* End of element event.
|
|
* @param string $name Element name.
|
|
* @return boolean False on parse error.
|
|
* @access public
|
|
*/
|
|
function endElement($name) {
|
|
}
|
|
|
|
/**
|
|
* Unparsed, but relevant data.
|
|
* @param string $text May include unparsed tags.
|
|
* @return boolean False on parse error.
|
|
* @access public
|
|
*/
|
|
function addContent($text) {
|
|
}
|
|
}
|
|
|