382 lines
14 KiB
PHP
Executable File
382 lines
14 KiB
PHP
Executable File
<?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 WebTester
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* @version $Id: php_parser.php 1911 2009-07-29 16:38:04Z lastcraft $
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*/
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/**
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* Builds the page object.
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* @package SimpleTest
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* @subpackage WebTester
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*/
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class SimpleTidyPageBuilder {
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private $page;
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private $forms = array();
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private $labels = array();
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private $widgets_by_id = array();
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public function __destruct() {
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$this->free();
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}
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/**
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* Frees up any references so as to allow the PHP garbage
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* collection from unset() to work.
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*/
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private function free() {
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unset($this->page);
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$this->forms = array();
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$this->labels = array();
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}
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/**
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* This builder is only available if the 'tidy' extension is loaded.
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* @return boolean True if available.
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*/
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function can() {
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return extension_loaded('tidy');
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}
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/**
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* Reads the raw content the page using HTML Tidy.
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* @param $response SimpleHttpResponse Fetched response.
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* @return SimplePage Newly parsed page.
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*/
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function parse($response) {
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$this->page = new SimplePage($response);
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$tidied = tidy_parse_string($input = $this->insertGuards($response->getContent()),
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array('output-xml' => false, 'wrap' => '0', 'indent' => 'no'),
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'latin1');
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$this->walkTree($tidied->html());
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$this->attachLabels($this->widgets_by_id, $this->labels);
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$this->page->setForms($this->forms);
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$page = $this->page;
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$this->free();
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return $page;
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}
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/**
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* Stops HTMLTidy stripping content that we wish to preserve.
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* @param string The raw html.
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* @return string The html with guard tags inserted.
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*/
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private function insertGuards($html) {
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return $this->insertEmptyTagGuards($this->insertTextareaSimpleWhitespaceGuards($html));
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}
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/**
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* Removes the extra content added during the parse stage
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* in order to preserve content we don't want stripped
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* out by HTMLTidy.
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* @param string The raw html.
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* @return string The html with guard tags removed.
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*/
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private function stripGuards($html) {
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return $this->stripTextareaWhitespaceGuards($this->stripEmptyTagGuards($html));
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}
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/**
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* HTML tidy strips out empty tags such as <option> which we
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* need to preserve. This method inserts an additional marker.
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* @param string The raw html.
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* @return string The html with guards inserted.
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*/
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private function insertEmptyTagGuards($html) {
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return preg_replace('#<(option|textarea)([^>]*)>(\s*)</(option|textarea)>#is',
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'<\1\2>___EMPTY___\3</\4>',
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$html);
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}
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/**
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* HTML tidy strips out empty tags such as <option> which we
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* need to preserve. This method strips additional markers
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* inserted by SimpleTest to the tidy output used to make the
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* tags non-empty. This ensures their preservation.
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* @param string The raw html.
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* @return string The html with guards removed.
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*/
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private function stripEmptyTagGuards($html) {
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return preg_replace('#(^|>)(\s*)___EMPTY___(\s*)(</|$)#i', '\2\3', $html);
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}
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/**
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* By parsing the XML output of tidy, we lose some whitespace
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* information in textarea tags. We temporarily recode this
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* data ourselves so as not to lose it.
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* @param string The raw html.
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* @return string The html with guards inserted.
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*/
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private function insertTextareaSimpleWhitespaceGuards($html) {
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return preg_replace_callback('#<textarea([^>]*)>(.*?)</textarea>#is',
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array($this, 'insertWhitespaceGuards'),
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$html);
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}
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/**
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* Callback for insertTextareaSimpleWhitespaceGuards().
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* @param array $matches Result of preg_replace_callback().
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* @return string Guard tags now replace whitespace.
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*/
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private function insertWhitespaceGuards($matches) {
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return '<textarea' . $matches[1] . '>' .
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str_replace(array("\n", "\r", "\t", ' '),
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array('___NEWLINE___', '___CR___', '___TAB___', '___SPACE___'),
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$matches[2]) .
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'</textarea>';
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}
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/**
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* Removes the whitespace preserving guards we added
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* before parsing.
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* @param string The raw html.
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* @return string The html with guards removed.
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*/
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private function stripTextareaWhitespaceGuards($html) {
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return str_replace(array('___NEWLINE___', '___CR___', '___TAB___', '___SPACE___'),
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array("\n", "\r", "\t", ' '),
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$html);
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}
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/**
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* Visits the given node and all children
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* @param object $node Tidy XML node.
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*/
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private function walkTree($node) {
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if ($node->name == 'a') {
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$this->page->addLink($this->tags()->createTag($node->name, (array)$node->attribute)
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->addContent($this->innerHtml($node)));
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} elseif ($node->name == 'base' and isset($node->attribute['href'])) {
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$this->page->setBase($node->attribute['href']);
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} elseif ($node->name == 'title') {
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$this->page->setTitle($this->tags()->createTag($node->name, (array)$node->attribute)
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->addContent($this->innerHtml($node)));
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} elseif ($node->name == 'frameset') {
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$this->page->setFrames($this->collectFrames($node));
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} elseif ($node->name == 'form') {
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$this->forms[] = $this->walkForm($node, $this->createEmptyForm($node));
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} elseif ($node->name == 'label') {
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$this->labels[] = $this->tags()->createTag($node->name, (array)$node->attribute)
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->addContent($this->innerHtml($node));
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} else {
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$this->walkChildren($node);
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}
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}
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/**
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* Helper method for traversing the XML tree.
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* @param object $node Tidy XML node.
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*/
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private function walkChildren($node) {
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if ($node->hasChildren()) {
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foreach ($node->child as $child) {
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$this->walkTree($child);
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}
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}
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}
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/**
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* Facade for forms containing preparsed widgets.
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* @param object $node Tidy XML node.
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* @return SimpleForm Facade for SimpleBrowser.
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*/
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private function createEmptyForm($node) {
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return new SimpleForm($this->tags()->createTag($node->name, (array)$node->attribute), $this->page);
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}
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/**
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* Visits the given node and all children
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* @param object $node Tidy XML node.
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*/
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private function walkForm($node, $form, $enclosing_label = '') {
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if ($node->name == 'a') {
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$this->page->addLink($this->tags()->createTag($node->name, (array)$node->attribute)
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->addContent($this->innerHtml($node)));
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} elseif (in_array($node->name, array('input', 'button', 'textarea', 'select'))) {
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$this->addWidgetToForm($node, $form, $enclosing_label);
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} elseif ($node->name == 'label') {
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$this->labels[] = $this->tags()->createTag($node->name, (array)$node->attribute)
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->addContent($this->innerHtml($node));
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if ($node->hasChildren()) {
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foreach ($node->child as $child) {
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$this->walkForm($child, $form, SimplePage::normalise($this->innerHtml($node)));
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}
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}
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} elseif ($node->hasChildren()) {
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foreach ($node->child as $child) {
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$this->walkForm($child, $form);
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}
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}
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return $form;
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}
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/**
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* Tests a node for a "for" atribute. Used for
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* attaching labels.
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* @param object $node Tidy XML node.
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* @return boolean True if the "for" attribute exists.
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*/
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private function hasFor($node) {
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return isset($node->attribute) and $node->attribute['for'];
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}
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/**
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* Adds the widget into the form container.
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* @param object $node Tidy XML node of widget.
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* @param SimpleForm $form Form to add it to.
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* @param string $enclosing_label The label of any label
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* tag we might be in.
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*/
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private function addWidgetToForm($node, $form, $enclosing_label) {
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$widget = $this->tags()->createTag($node->name, $this->attributes($node));
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if (! $widget) {
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return;
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}
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$widget->setLabel($enclosing_label)
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->addContent($this->innerHtml($node));
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if ($node->name == 'select') {
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$widget->addTags($this->collectSelectOptions($node));
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}
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$form->addWidget($widget);
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$this->indexWidgetById($widget);
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}
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/**
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* Fills the widget cache to speed up searching.
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* @param SimpleTag $widget Parsed widget to cache.
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*/
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private function indexWidgetById($widget) {
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$id = $widget->getAttribute('id');
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if (! $id) {
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return;
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}
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if (! isset($this->widgets_by_id[$id])) {
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$this->widgets_by_id[$id] = array();
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}
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$this->widgets_by_id[$id][] = $widget;
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}
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/**
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* Parses the options from inside an XML select node.
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* @param object $node Tidy XML node.
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* @return array List of SimpleTag options.
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*/
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private function collectSelectOptions($node) {
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$options = array();
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if ($node->name == 'option') {
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$options[] = $this->tags()->createTag($node->name, $this->attributes($node))
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->addContent($this->innerHtml($node));
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}
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if ($node->hasChildren()) {
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foreach ($node->child as $child) {
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$options = array_merge($options, $this->collectSelectOptions($child));
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}
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}
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return $options;
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}
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/**
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* Convenience method for collecting all the attributes
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* of a tag. Not sure why Tidy does not have this.
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* @param object $node Tidy XML node.
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* @return array Hash of attribute strings.
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*/
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private function attributes($node) {
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if (! preg_match('|<[^ ]+\s(.*?)/?>|s', $node->value, $first_tag_contents)) {
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return array();
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}
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$attributes = array();
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preg_match_all('/\S+\s*=\s*\'[^\']*\'|(\S+\s*=\s*"[^"]*")|([^ =]+\s*=\s*[^ "\']+?)|[^ "\']+/', $first_tag_contents[1], $matches);
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foreach($matches[0] as $unparsed) {
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$attributes = $this->mergeAttribute($attributes, $unparsed);
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}
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return $attributes;
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}
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/**
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* Overlay an attribute into the attributes hash.
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* @param array $attributes Current attribute list.
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* @param string $raw Raw attribute string with
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* both key and value.
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* @return array New attribute hash.
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*/
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private function mergeAttribute($attributes, $raw) {
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$parts = explode('=', $raw);
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list($name, $value) = count($parts) == 1 ? array($parts[0], $parts[0]) : $parts;
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$attributes[trim($name)] = html_entity_decode($this->dequote(trim($value)), ENT_QUOTES);
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return $attributes;
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}
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/**
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* Remove start and end quotes.
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* @param string $quoted A quoted string.
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* @return string Quotes are gone.
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*/
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private function dequote($quoted) {
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if (preg_match('/^(\'([^\']*)\'|"([^"]*)")$/', $quoted, $matches)) {
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return isset($matches[3]) ? $matches[3] : $matches[2];
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}
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return $quoted;
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}
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/**
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* Collects frame information inside a frameset tag.
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* @param object $node Tidy XML node.
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* @return array List of SimpleTag frame descriptions.
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*/
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private function collectFrames($node) {
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$frames = array();
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if ($node->name == 'frame') {
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$frames = array($this->tags()->createTag($node->name, (array)$node->attribute));
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} else if ($node->hasChildren()) {
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$frames = array();
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foreach ($node->child as $child) {
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$frames = array_merge($frames, $this->collectFrames($child));
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}
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}
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return $frames;
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}
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/**
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* Extracts the XML node text.
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* @param object $node Tidy XML node.
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* @return string The text only.
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*/
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private function innerHtml($node) {
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$raw = '';
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if ($node->hasChildren()) {
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foreach ($node->child as $child) {
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$raw .= $child->value;
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}
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}
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return $this->stripGuards($raw);
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}
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/**
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* Factory for parsed content holders.
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* @return SimpleTagBuilder Factory.
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*/
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private function tags() {
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return new SimpleTagBuilder();
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}
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/**
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* Called at the end of a parse run. Attaches any
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* non-wrapping labels to their form elements.
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* @param array $widgets_by_id Cached SimpleTag hash.
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* @param array $labels SimpleTag label elements.
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*/
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private function attachLabels($widgets_by_id, $labels) {
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foreach ($labels as $label) {
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$for = $label->getFor();
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if ($for and isset($widgets_by_id[$for])) {
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$text = $label->getText();
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foreach ($widgets_by_id[$for] as $widget) {
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$widget->setLabel($text);
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}
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}
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}
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}
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}
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?>
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