mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-06-28 23:49:26 +02:00
cca7e9697c
Note that the best solution to this will be to remove the use of SimpleTest entirely. This is quick fix is intended to help us get PHP7 tests running without needing to cross that bridge.
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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* 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,
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$this->_attributes);
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$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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/**
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* Accepts a token from the end tag mode.
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* The element name is converted to lower case.
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* @param string $token Incoming characters.
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* @param integer $event Lexer event type.
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* @return boolean False if parse error.
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* @access public
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*/
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function acceptEndToken($token, $event) {
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if (! preg_match('/<\/(.*)>/', $token, $matches)) {
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return false;
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}
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return $this->_listener->endElement(strtolower($matches[1]));
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}
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/**
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* Part of the tag data.
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* @param string $token Incoming characters.
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* @param integer $event Lexer event type.
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* @return boolean False if parse error.
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* @access public
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*/
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function acceptAttributeToken($token, $event) {
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if ($this->_current_attribute) {
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if ($event == LEXER_UNMATCHED) {
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$this->_attributes[$this->_current_attribute] .=
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SimpleHtmlSaxParser::decodeHtml($token);
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}
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if ($event == LEXER_SPECIAL) {
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$this->_attributes[$this->_current_attribute] .=
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preg_replace('/^=\s*/' , '', SimpleHtmlSaxParser::decodeHtml($token));
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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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* A character entity.
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* @param string $token Incoming characters.
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* @param integer $event Lexer event type.
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* @return boolean False if parse error.
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* @access public
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*/
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function acceptEntityToken($token, $event) {
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}
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/**
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* Character data between tags regarded as
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* important.
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* @param string $token Incoming characters.
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* @param integer $event Lexer event type.
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* @return boolean False if parse error.
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* @access public
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*/
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function acceptTextToken($token, $event) {
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return $this->_listener->addContent($token);
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}
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/**
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* Incoming data to be ignored.
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* @param string $token Incoming characters.
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* @param integer $event Lexer event type.
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* @return boolean False if parse error.
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* @access public
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*/
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function ignore($token, $event) {
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return true;
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}
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/**
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* Decodes any HTML entities.
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* @param string $html Incoming HTML.
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* @return string Outgoing plain text.
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* @access public
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* @static
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*/
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static function decodeHtml($html) {
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return html_entity_decode($html, ENT_QUOTES);
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}
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/**
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* Turns HTML into text browser visible text. Images
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* are converted to their alt text and tags are supressed.
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* Entities are converted to their visible representation.
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* @param string $html HTML to convert.
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* @return string Plain text.
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* @access public
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* @static
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*/
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static function normalise($html) {
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$text = preg_replace('|<!--.*?-->|', '', $html);
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$text = preg_replace('|<script[^>]*>.*?</script>|', '', $text);
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$text = preg_replace('|<img[^>]*alt\s*=\s*"([^"]*)"[^>]*>|', ' \1 ', $text);
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$text = preg_replace('|<img[^>]*alt\s*=\s*\'([^\']*)\'[^>]*>|', ' \1 ', $text);
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$text = preg_replace('|<img[^>]*alt\s*=\s*([a-zA-Z_]+)[^>]*>|', ' \1 ', $text);
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$text = preg_replace('|<[^>]*>|', '', $text);
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$text = SimpleHtmlSaxParser::decodeHtml($text);
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$text = preg_replace('|\s+|', ' ', $text);
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return trim(trim($text), "\xA0"); // TODO: The \xAO is a . Add a test for this.
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}
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}
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/**
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* SAX event handler.
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* @package SimpleTest
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* @subpackage WebTester
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* @abstract
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*/
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class SimpleSaxListener {
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/**
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* Sets the document to write to.
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* @access public
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*/
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function __construct() {
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}
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/**
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* Start of element event.
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* @param string $name Element name.
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* @param hash $attributes Name value pairs.
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* Attributes without content
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* are marked as true.
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* @return boolean False on parse error.
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* @access public
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*/
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function startElement($name, $attributes) {
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}
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/**
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* End of element event.
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* @param string $name Element name.
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* @return boolean False on parse error.
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* @access public
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*/
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function endElement($name) {
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}
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/**
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* Unparsed, but relevant data.
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* @param string $text May include unparsed tags.
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* @return boolean False on parse error.
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* @access public
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*/
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function addContent($text) {
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}
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}
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