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File Content: `AutoParagraph.php`

<?php

/**
 * Injector that auto paragraphs text in the root node based on
 * double-spacing.
 * @todo Ensure all states are unit tested, including variations as well.
 * @todo Make a graph of the flow control for this Injector.
 */
class HTMLPurifier_Injector_AutoParagraph extends HTMLPurifier_Injector
{
    /**
     * @type string
     */
    public $name = 'AutoParagraph';

    /**
     * @type array
     */
    public $needed = array('p');

    /**
     * @return HTMLPurifier_Token_Start
     */
    private function _pStart()
    {
        $par = new HTMLPurifier_Token_Start('p');
        $par->armor['MakeWellFormed_TagClosedError'] = true;
        return $par;
    }

    /**
     * @param HTMLPurifier_Token_Text $token
     */
    public function handleText(&$token)
    {
        $text = $token->data;
        // Does the current parent allow <p> tags?
        if ($this->allowsElement('p')) {
            if (empty($this->currentNesting) || strpos($text, "\n\n") !== false) {
                // Note that we have differing behavior when dealing with text
                // in the anonymous root node, or a node inside the document.
                // If the text as a double-newline, the treatment is the same;
                // if it doesn't, see the next if-block if you're in the document.

                $i = $nesting = null;
                if (!$this->forwardUntilEndToken($i, $current, $nesting) && $token->is_whitespace) {
                    // State 1.1: ...    ^ (whitespace, then document end)
                    //               ----
                    // This is a degenerate case
                } else {
                    if (!$token->is_whitespace || $this->_isInline($current)) {
                        // State 1.2: PAR1
                        //            ----

                        // State 1.3: PAR1\n\nPAR2
                        //            ------------

                        // State 1.4: <div>PAR1\n\nPAR2 (see State 2)
                        //                 ------------
                        $token = array($this->_pStart());
                        $this->_splitText($text, $token);
                    } else {
                        // State 1.5: \n<hr />
                        //            --
                    }
                }
            } else {
                // State 2:   <div>PAR1... (similar to 1.4)
                //                 ----

                // We're in an element that allows paragraph tags, but we're not
                // sure if we're going to need them.
                if ($this->_pLookAhead()) {
                    // State 2.1: <div>PAR1<b>PAR1\n\nPAR2
                    //                 ----
                    // Note: This will always be the first child, since any
                    // previous inline element would have triggered this very
                    // same routine, and found the double newline. One possible
                    // exception would be a comment.
                    $token = array($this->_pStart(), $token);
                } else {
                    // State 2.2.1: <div>PAR1<div>
                    //                   ----

                    // State 2.2.2: <div>PAR1<b>PAR1</b></div>
                    //                   ----
                }
            }
            // Is the current parent a <p> tag?
        } elseif (!empty($this->currentNesting) &&
            $this->currentNesting[count($this->currentNesting) - 1]->name == 'p') {
            // State 3.1: ...<p>PAR1
            //                  ----

            // State 3.2: ...<p>PAR1\n\nPAR2
            //                  ------------
            $token = array();
            $this->_splitText($text, $token);
            // Abort!
        } else {
            // State 4.1: ...<b>PAR1
            //                  ----

            // State 4.2: ...<b>PAR1\n\nPAR2
            //                  ------------
        }
    }

    /**
     * @param HTMLPurifier_Token $token
     */
    public function handleElement(&$token)
    {
        // We don't have to check if we're already in a <p> tag for block
        // tokens, because the tag would have been autoclosed by MakeWellFormed.
        if ($this->allowsElement('p')) {
            if (!empty($this->currentNesting)) {
                if ($this->_isInline($token)) {
                    // State 1: <div>...<b>
                    //                  ---
                    // Check if this token is adjacent to the parent token
                    // (seek backwards until token isn't whitespace)
                    $i = null;
                    $this->backward($i, $prev);

                    if (!$prev instanceof HTMLPurifier_Token_Start) {
                        // Token wasn't adjacent
                        if ($prev instanceof HTMLPurifier_Token_Text &&
                            substr($prev->data, -2) === "\n\n"
                        ) {
                            // State 1.1.4: <div><p>PAR1</p>\n\n<b>
                            //                                  ---
                            // Quite frankly, this should be handled by splitText
                            $token = array($this->_pStart(), $token);
                        } else {
                            // State 1.1.1: <div><p>PAR1</p><b>
                            //                              ---
                            // State 1.1.2: <div><br /><b>
                            //                         ---
                            // State 1.1.3: <div>PAR<b>
                            //                      ---
                        }
                    } else {
                        // State 1.2.1: <div><b>
                        //                   ---
                        // Lookahead to see if <p> is needed.
                        if ($this->_pLookAhead()) {
                            // State 1.3.1: <div><b>PAR1\n\nPAR2
                            //                   ---
                            $token = array($this->_pStart(), $token);
                        } else {
                            // State 1.3.2: <div><b>PAR1</b></div>
                            //                   ---

                            // State 1.3.3: <div><b>PAR1</b><div></div>\n\n</div>
                            //                   ---
                        }
                    }
                } else {
                    // State 2.3: ...<div>
                    //               -----
                }
            } else {
                if ($this->_isInline($token)) {
                    // State 3.1: <b>
                    //            ---
                    // This is where the {p} tag is inserted, not reflected in
                    // inputTokens yet, however.
                    $token = array($this->_pStart(), $token);
                } else {
                    // State 3.2: <div>
                    //            -----
                }

                $i = null;
                if ($this->backward($i, $prev)) {
                    if (!$prev instanceof HTMLPurifier_Token_Text) {
                        // State 3.1.1: ...</p>{p}<b>
                        //                        ---
                        // State 3.2.1: ...</p><div>
                        //                     -----
                        if (!is_array($token)) {
                            $token = array($token);
                        }
                        array_unshift($token, new HTMLPurifier_Token_Text("\n\n"));
                    } else {
                        // State 3.1.2: ...</p>\n\n{p}<b>
                        //                            ---
                        // State 3.2.2: ...</p>\n\n<div>
                        //                         -----
                        // Note: PAR<ELEM> cannot occur because PAR would have been
                        // wrapped in <p> tags.
                    }
                }
            }
        } else {
            // State 2.2: <ul><li>
            //                ----
            // State 2.4: <p><b>
            //               ---
        }
    }

    /**
     * Splits up a text in paragraph tokens and appends them
     * to the result stream that will replace the original
     * @param string $data String text data that will be processed
     *    into paragraphs
     * @param HTMLPurifier_Token[] $result Reference to array of tokens that the
     *    tags will be appended onto
     */
    private function _splitText($data, &$result)
    {
        $raw_paragraphs = explode("\n\n", $data);
        $paragraphs = array(); // without empty paragraphs
        $needs_start = false;
        $needs_end = false;

        $c = count($raw_paragraphs);
        if ($c == 1) {
            // There were no double-newlines, abort quickly. In theory this
            // should never happen.
            $result[] = new HTMLPurifier_Token_Text($data);
            return;
        }
        for ($i = 0; $i < $c; $i++) {
            $par = $raw_paragraphs[$i];
            if (trim($par) !== '') {
                $paragraphs[] = $par;
            } else {
                if ($i == 0) {
                    // Double newline at the front
                    if (empty($result)) {
                        // The empty result indicates that the AutoParagraph
                        // injector did not add any start paragraph tokens.
                        // This means that we have been in a paragraph for
                        // a while, and the newline means we should start a new one.
                        $result[] = new HTMLPurifier_Token_End('p');
                        $result[] = new HTMLPurifier_Token_Text("\n\n");
                        // However, the start token should only be added if
                        // there is more processing to be done (i.e. there are
                        // real paragraphs in here). If there are none, the
                        // next start paragraph tag will be handled by the
                        // next call to the injector
                        $needs_start = true;
                    } else {
                        // We just started a new paragraph!
                        // Reinstate a double-newline for presentation's sake, since
                        // it was in the source code.
                        array_unshift($result, new HTMLPurifier_Token_Text("\n\n"));
                    }
                } elseif ($i + 1 == $c) {
                    // Double newline at the end
                    // There should be a trailing </p> when we're finally done.
                    $needs_end = true;
                }
            }
        }

        // Check if this was just a giant blob of whitespace. Move this earlier,
        // perhaps?
        if (empty($paragraphs)) {
            return;
        }

        // Add the start tag indicated by \n\n at the beginning of $data
        if ($needs_start) {
            $result[] = $this->_pStart();
        }

        // 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_Text("\n\n");
            $result[] = $this->_pStart();
        }

        // Remove trailing start token; Injector will handle this later if
        // it was indeed needed. This prevents from needing to do a lookahead,
        // at the cost of a lookbehind later.
        array_pop($result);

        // If there is no need for an end tag, remove all of it and let
        // MakeWellFormed close it later.
        if (!$needs_end) {
            array_pop($result); // removes \n\n
            array_pop($result); // removes </p>
        }
    }

    /**
     * Returns true if passed token is inline (and, ergo, allowed in
     * paragraph tags)
     * @param HTMLPurifier_Token $token
     * @return bool
     */
    private function _isInline($token)
    {
        return isset($this->htmlDefinition->info['p']->child->elements[$token->name]);
    }

    /**
     * Looks ahead in the token list and determines whether or not we need
     * to insert a <p> tag.
     * @return bool
     */
    private function _pLookAhead()
    {
        if ($this->currentToken instanceof HTMLPurifier_Token_Start) {
            $nesting = 1;
        } else {
            $nesting = 0;
        }
        $ok = false;
        $i = null;
        while ($this->forwardUntilEndToken($i, $current, $nesting)) {
            $result = $this->_checkNeedsP($current);
            if ($result !== null) {
                $ok = $result;
                break;
            }
        }
        return $ok;
    }

    /**
     * Determines if a particular token requires an earlier inline token
     * to get a paragraph. This should be used with _forwardUntilEndToken
     * @param HTMLPurifier_Token $current
     * @return bool
     */
    private function _checkNeedsP($current)
    {
        if ($current instanceof HTMLPurifier_Token_Start) {
            if (!$this->_isInline($current)) {
                // <div>PAR1<div>
                //      ----
                // Terminate early, since we hit a block element
                return false;
            }
        } elseif ($current instanceof HTMLPurifier_Token_Text) {
            if (strpos($current->data, "\n\n") !== false) {
                // <div>PAR1<b>PAR1\n\nPAR2
                //      ----
                return true;
            } else {
                // <div>PAR1<b>PAR1...
                //      ----
            }
        }
        return null;
    }
}

// vim: et sw=4 sts=4
Name	Size	Permission
AutoParagraph.php	13796 bytes	0775
DisplayLinkURI.php	859 bytes	0775
Linkify.php	2088 bytes	0775
PurifierLinkify.php	1811 bytes	0775
RemoveEmpty.php	3508 bytes	0775
RemoveSpansWithoutAttributes.php	2280 bytes	0775
SafeObject.php	3951 bytes	0775
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File Content: AutoParagraph.php

File Content: `AutoParagraph.php`
