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htmlpurifier/library/HTMLPurifier/Injector/AutoParagraph.php

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<?php
require_once 'HTMLPurifier/Injector.php';
/**
* Injector that auto paragraphs text in the root node based on
* double-spacing.
* @todo Don't assume that root node means paragraphing is alright
*/
class HTMLPurifier_Injector_AutoParagraph extends HTMLPurifier_Injector
{
function handleText(&$token, $config, &$context) {
$current_nesting =& $context->get('CurrentNesting');
$text = $token->data;
// $token is the focus: if processing is needed, it gets
// turned into an array of tokens that will replace the
// original token
if (empty($current_nesting)) {
// we're in root node, great time to start a paragraph
// since we're also dealing with a text node
$token = array(new HTMLPurifier_Token_Start('p'));
$this->_splitText($text, $token, $config, $context);
} elseif ($current_nesting[count($current_nesting)-1]->name == 'p') {
// we're not in root node but we're in a paragraph, so don't
// add a paragraph start tag but still perform processing
$token = array();
$this->_splitText($text, $token, $config, $context);
}
}
function handleStart(&$token, $config, &$context) {
// check if we're inside a tag already, if so, don't add
// paragraph tags
$current_nesting = $context->get('CurrentNesting');
if (!empty($current_nesting)) return;
// check if the start tag counts as a "block" element
if (!$this->_isInline($token, $config)) return;
// append a paragraph tag before the token
$token = array(new HTMLPurifier_Token_Start('p'), $token);
}
/**
* Splits up a text in paragraph tokens and appends them
* to the result stream that will replace the original
* @param $data String text data that will be processed
* into paragraphs
* @param $result Reference to array of tokens that the
* tags will be appended onto
* @param $config Instance of HTMLPurifier_Config
* @param $context Instance of HTMLPurifier_Context
* @private
*/
function _splitText($data, &$result, $config, &$context) {
$raw_paragraphs = explode(PHP_EOL . PHP_EOL, $data);
// remove empty paragraphs
$paragraphs = array();
foreach ($raw_paragraphs as $par) {
if (trim($par) !== '') $paragraphs[] = $par;
}
// check if there are no "real" paragraphs to be processed
if (empty($paragraphs) && count($raw_paragraphs) > 1) {
$result[] = new HTMLPurifier_Token_End('p');
return;
}
// append the paragraphs onto the result
foreach ($paragraphs as $par) {
$result[] = new HTMLPurifier_Token_Text($par);
$result[] = new HTMLPurifier_Token_End('p');
$result[] = new HTMLPurifier_Token_Start('p');
}
array_pop($result); // remove trailing start token
// check the outside to determine whether or not the
// end paragraph tag should be removed
if ($this->_removeParagraphEnd($config, $context)) {
array_pop($result);
}
}
/**
* Returns boolean whether or not to remove the paragraph end tag
* that was automatically added. The paragraph end tag should be
* removed unless the next token is a paragraph or block element.
* @param $config Instance of HTMLPurifier_Config
* @param $context Instance of HTMLPurifier_Context
* @private
*/
function _removeParagraphEnd($config, &$context) {
$tokens = $context->get('InputTokens');
$i = $context->get('InputIndex');
$remove_paragraph_end = true;
// Start of the checks one after the current token's index
for ($i++; isset($tokens[$i]); $i++) {
if ($tokens[$i]->type == 'start' || $tokens[$i]->type == 'empty') {
$definition = $config->getHTMLDefinition();
$remove_paragraph_end = $this->_isInline($tokens[$i], $config);
break;
}
// check if we can abort early (whitespace means we carry-on!)
if ($tokens[$i]->type == 'text' && !$tokens[$i]->is_whitespace) break;
if ($tokens[$i]->type == 'end') break; // nonsensical
}
return $remove_paragraph_end;
}
/**
* Returns true if passed token is inline (and, ergo, allowed in
* paragraph tags)
*/
function _isInline($token, $config) {
$definition = $config->getHTMLDefinition();
return isset($definition->info['p']->child->elements[$token->name]);
}
}
?>