489 lines
No EOL
15 KiB
PHP
489 lines
No EOL
15 KiB
PHP
<?php
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/**
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* Class to convert HTML to Markdown with PHP Markdown Extra syntax support.
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*
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* @version 1.0.0 alpha
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* @author Milian Wolff (<mail@milianw.de>, <http://milianw.de>)
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* @license LGPL, see LICENSE_LGPL.txt and the summary below
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* @copyright (C) 2007 Milian Wolff
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* standard Markdownify class
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*/
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require_once dirname(__FILE__).'/markdownify.php';
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class Markdownify_Extra extends Markdownify {
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/**
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* table data, including rows with content and the maximum width of each col
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*
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* @var array
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*/
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var $table = array();
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/**
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* current col
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*
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* @var int
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*/
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var $col = -1;
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/**
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* current row
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*
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* @var int
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*/
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var $row = 0;
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/**
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* constructor, see Markdownify::Markdownify() for more information
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*/
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function Markdownify_Extra($linksAfterEachParagraph = MDFY_LINKS_EACH_PARAGRAPH, $bodyWidth = MDFY_BODYWIDTH, $keepHTML = MDFY_KEEPHTML) {
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parent::Markdownify($linksAfterEachParagraph, $bodyWidth, $keepHTML);
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### new markdownable tags & attributes
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# header ids: # foo {bar}
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$this->isMarkdownable['h1']['id'] = 'optional';
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$this->isMarkdownable['h2']['id'] = 'optional';
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$this->isMarkdownable['h3']['id'] = 'optional';
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$this->isMarkdownable['h4']['id'] = 'optional';
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$this->isMarkdownable['h5']['id'] = 'optional';
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$this->isMarkdownable['h6']['id'] = 'optional';
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# tables
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$this->isMarkdownable['table'] = array();
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$this->isMarkdownable['th'] = array(
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'align' => 'optional',
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);
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$this->isMarkdownable['td'] = array(
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'align' => 'optional',
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);
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$this->isMarkdownable['tr'] = array();
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array_push($this->ignore, 'thead');
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array_push($this->ignore, 'tbody');
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array_push($this->ignore, 'tfoot');
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# definition lists
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$this->isMarkdownable['dl'] = array();
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$this->isMarkdownable['dd'] = array();
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$this->isMarkdownable['dt'] = array();
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# footnotes
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$this->isMarkdownable['fnref'] = array(
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'target' => 'required',
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);
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$this->isMarkdownable['footnotes'] = array();
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$this->isMarkdownable['fn'] = array(
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'name' => 'required',
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);
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$this->parser->blockElements['fnref'] = false;
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$this->parser->blockElements['fn'] = true;
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$this->parser->blockElements['footnotes'] = true;
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# abbr
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$this->isMarkdownable['abbr'] = array(
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'title' => 'required',
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);
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# build RegEx lookahead to decide wether table can pe parsed or not
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$inlineTags = array_keys($this->parser->blockElements, false);
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$colContents = '(?:[^<]|<(?:'.implode('|', $inlineTags).'|[^a-z]))+';
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$this->tableLookaheadHeader = '{
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^\s*(?:<thead\s*>)?\s* # open optional thead
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<tr\s*>\s*(?: # start required row with headers
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<th(?:\s+align=("|\')(?:left|center|right)\1)?\s*> # header with optional align
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\s*'.$colContents.'\s* # contents
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</th>\s* # close header
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)+</tr> # close row with headers
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\s*(?:</thead>)? # close optional thead
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}sxi';
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$this->tdSubstitute = '\s*'.$colContents.'\s* # contents
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</td>\s*';
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$this->tableLookaheadBody = '{
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\s*(?:<tbody\s*>)?\s* # open optional tbody
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(?:<tr\s*>\s* # start row
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%s # cols to be substituted
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</tr>)+ # close row
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\s*(?:</tbody>)? # close optional tbody
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\s*</table> # close table
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}sxi';
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}
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/**
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* handle header tags (<h1> - <h6>)
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*
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* @param int $level 1-6
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* @return void
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*/
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function handleHeader($level) {
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static $id = null;
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if ($this->parser->isStartTag) {
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if (isset($this->parser->tagAttributes['id'])) {
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$id = $this->parser->tagAttributes['id'];
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}
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} else {
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if (!is_null($id)) {
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$this->out(' {#'.$id.'}');
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$id = null;
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}
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}
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parent::handleHeader($level);
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}
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/**
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* handle <abbr> tags
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*
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* @param void
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* @return void
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*/
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function handleTag_abbr() {
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if ($this->parser->isStartTag) {
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$this->stack();
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$this->buffer();
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} else {
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$tag = $this->unstack();
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$tag['text'] = $this->unbuffer();
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$add = true;
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foreach ($this->stack['abbr'] as $stacked) {
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if ($stacked['text'] == $tag['text']) {
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/** TODO: differing abbr definitions, i.e. different titles for same text **/
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$add = false;
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break;
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}
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}
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$this->out($tag['text']);
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if ($add) {
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array_push($this->stack['abbr'], $tag);
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}
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}
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}
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/**
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* flush stacked abbr tags
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*
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* @param void
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* @return void
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*/
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function flushStacked_abbr() {
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$out = array();
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foreach ($this->stack['abbr'] as $k => $tag) {
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if (!isset($tag['unstacked'])) {
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array_push($out, ' *['.$tag['text'].']: '.$tag['title']);
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$tag['unstacked'] = true;
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$this->stack['abbr'][$k] = $tag;
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}
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}
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if (!empty($out)) {
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$this->out("\n\n".implode("\n", $out));
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}
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}
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/**
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* handle <table> tags
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*
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* @param void
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* @return void
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*/
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function handleTag_table() {
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if ($this->parser->isStartTag) {
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# check if upcoming table can be converted
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if ($this->keepHTML) {
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if (preg_match($this->tableLookaheadHeader, $this->parser->html, $matches)) {
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# header seems good, now check body
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# get align & number of cols
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preg_match_all('#<th(?:\s+align=("|\')(left|right|center)\1)?\s*>#si', $matches[0], $cols);
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$regEx = '';
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$i = 1;
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$aligns = array();
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foreach ($cols[2] as $align) {
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$align = strtolower($align);
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array_push($aligns, $align);
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if (empty($align)) {
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$align = 'left'; # default value
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}
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$td = '\s+align=("|\')'.$align.'\\'.$i;
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$i++;
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if ($align == 'left') {
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# look for empty align or left
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$td = '(?:'.$td.')?';
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}
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$td = '<td'.$td.'\s*>';
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$regEx .= $td.$this->tdSubstitute;
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}
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$regEx = sprintf($this->tableLookaheadBody, $regEx);
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if (preg_match($regEx, $this->parser->html, $matches, null, strlen($matches[0]))) {
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# this is a markdownable table tag!
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$this->table = array(
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'rows' => array(),
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'col_widths' => array(),
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'aligns' => $aligns,
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);
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$this->row = 0;
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} else {
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# non markdownable table
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$this->handleTagToText();
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}
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} else {
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# non markdownable table
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$this->handleTagToText();
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}
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} else {
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$this->table = array(
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'rows' => array(),
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'col_widths' => array(),
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'aligns' => array(),
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);
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$this->row = 0;
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}
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} else {
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# finally build the table in Markdown Extra syntax
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$separator = array();
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# seperator with correct align identifikators
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foreach($this->table['aligns'] as $col => $align) {
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if (!$this->keepHTML && !isset($this->table['col_widths'][$col])) {
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break;
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}
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$left = ' ';
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$right = ' ';
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switch ($align) {
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case 'left':
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$left = ':';
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break;
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case 'center':
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$right = ':';
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$left = ':';
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case 'right':
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$right = ':';
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break;
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}
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array_push($separator, $left.str_repeat('-', $this->table['col_widths'][$col]).$right);
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}
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$separator = '|'.implode('|', $separator).'|';
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$rows = array();
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# add padding
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array_walk_recursive($this->table['rows'], array(&$this, 'alignTdContent'));
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$header = array_shift($this->table['rows']);
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array_push($rows, '| '.implode(' | ', $header).' |');
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array_push($rows, $separator);
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foreach ($this->table['rows'] as $row) {
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array_push($rows, '| '.implode(' | ', $row).' |');
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}
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$this->out(implode("\n".$this->indent, $rows));
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$this->table = array();
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$this->setLineBreaks(2);
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}
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}
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/**
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* properly pad content so it is aligned as whished
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* should be used with array_walk_recursive on $this->table['rows']
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*
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* @param string &$content
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* @param int $col
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* @return void
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*/
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function alignTdContent(&$content, $col) {
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switch ($this->table['aligns'][$col]) {
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default:
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case 'left':
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$content .= str_repeat(' ', $this->table['col_widths'][$col] - $this->strlen($content));
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break;
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case 'right':
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$content = str_repeat(' ', $this->table['col_widths'][$col] - $this->strlen($content)).$content;
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break;
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case 'center':
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$paddingNeeded = $this->table['col_widths'][$col] - $this->strlen($content);
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$left = floor($paddingNeeded / 2);
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$right = $paddingNeeded - $left;
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$content = str_repeat(' ', $left).$content.str_repeat(' ', $right);
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break;
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}
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}
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/**
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* handle <tr> tags
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*
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* @param void
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* @return void
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*/
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function handleTag_tr() {
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if ($this->parser->isStartTag) {
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$this->col = -1;
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} else {
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$this->row++;
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}
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}
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/**
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* handle <td> tags
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*
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* @param void
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* @return void
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*/
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function handleTag_td() {
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if ($this->parser->isStartTag) {
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$this->col++;
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if (!isset($this->table['col_widths'][$this->col])) {
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$this->table['col_widths'][$this->col] = 0;
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}
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$this->buffer();
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} else {
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$buffer = trim($this->unbuffer());
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$this->table['col_widths'][$this->col] = max($this->table['col_widths'][$this->col], $this->strlen($buffer));
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$this->table['rows'][$this->row][$this->col] = $buffer;
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}
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}
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/**
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* handle <th> tags
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*
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* @param void
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* @return void
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*/
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function handleTag_th() {
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if (!$this->keepHTML && !isset($this->table['rows'][1]) && !isset($this->table['aligns'][$this->col+1])) {
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if (isset($this->parser->tagAttributes['align'])) {
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$this->table['aligns'][$this->col+1] = $this->parser->tagAttributes['align'];
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} else {
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$this->table['aligns'][$this->col+1] = '';
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}
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}
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$this->handleTag_td();
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}
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/**
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* handle <dl> tags
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*
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* @param void
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* @return void
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*/
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function handleTag_dl() {
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if (!$this->parser->isStartTag) {
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$this->setLineBreaks(2);
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}
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}
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/**
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* handle <dt> tags
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*
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* @param void
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* @return void
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**/
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function handleTag_dt() {
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if (!$this->parser->isStartTag) {
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$this->setLineBreaks(1);
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}
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}
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/**
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* handle <dd> tags
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*
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* @param void
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* @return void
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*/
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function handleTag_dd() {
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if ($this->parser->isStartTag) {
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if (substr(ltrim($this->parser->html), 0, 3) == '<p>') {
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# next comes a paragraph, so we'll need an extra line
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$this->out("\n".$this->indent);
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} elseif (substr($this->output, -2) == "\n\n") {
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$this->output = substr($this->output, 0, -1);
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}
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$this->out(': ');
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$this->indent(' ', false);
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} else {
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# lookahead for next dt
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if (substr(ltrim($this->parser->html), 0, 4) == '<dt>') {
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$this->setLineBreaks(2);
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} else {
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$this->setLineBreaks(1);
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}
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$this->indent(' ');
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}
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}
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/**
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* handle <fnref /> tags (custom footnote references, see markdownify_extra::parseString())
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*
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* @param void
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* @return void
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*/
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function handleTag_fnref() {
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$this->out('[^'.$this->parser->tagAttributes['target'].']');
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}
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/**
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* handle <fn> tags (custom footnotes, see markdownify_extra::parseString()
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* and markdownify_extra::_makeFootnotes())
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*
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* @param void
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* @return void
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*/
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function handleTag_fn() {
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if ($this->parser->isStartTag) {
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$this->out('[^'.$this->parser->tagAttributes['name'].']:');
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$this->setLineBreaks(1);
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} else {
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$this->setLineBreaks(2);
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}
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$this->indent(' ');
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}
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/**
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* handle <footnotes> tag (custom footnotes, see markdownify_extra::parseString()
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* and markdownify_extra::_makeFootnotes())
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*
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* @param void
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* @return void
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*/
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function handleTag_footnotes() {
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if (!$this->parser->isStartTag) {
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$this->setLineBreaks(2);
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}
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}
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/**
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* parse a HTML string, clean up footnotes prior
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*
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* @param string $HTML input
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* @return string Markdown formatted output
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*/
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function parseString($html) {
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/** TODO: custom markdown-extra options, e.g. titles & classes **/
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# <sup id="fnref:..."><a href"#fn..." rel="footnote">...</a></sup>
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# => <fnref target="..." />
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$html = preg_replace('@<sup id="fnref:([^"]+)">\s*<a href="#fn:\1" rel="footnote">\s*\d+\s*</a>\s*</sup>@Us', '<fnref target="$1" />', $html);
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# <div class="footnotes">
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# <hr />
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# <ol>
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#
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# <li id="fn:...">...</li>
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# ...
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#
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# </ol>
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# </div>
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# =>
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# <footnotes>
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# <fn name="...">...</fn>
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# ...
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# </footnotes>
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$html = preg_replace_callback('#<div class="footnotes">\s*<hr />\s*<ol>\s*(.+)\s*</ol>\s*</div>#Us', array(&$this, '_makeFootnotes'), $html);
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return parent::parseString($html);
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}
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/**
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* replace HTML representation of footnotes with something more easily parsable
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*
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* @note this is a callback to be used in parseString()
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*
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* @param array $matches
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* @return string
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*/
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function _makeFootnotes($matches) {
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# <li id="fn:1">
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# ...
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# <a href="#fnref:block" rev="footnote">↩</a></p>
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# </li>
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# => <fn name="1">...</fn>
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# remove footnote link
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$fns = preg_replace('@\s*( \s*)?<a href="#fnref:[^"]+" rev="footnote"[^>]*>↩</a>\s*@s', '', $matches[1]);
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# remove empty paragraph
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$fns = preg_replace('@<p>\s*</p>@s', '', $fns);
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# <li id="fn:1">...</li> -> <footnote nr="1">...</footnote>
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$fns = str_replace('<li id="fn:', '<fn name="', $fns);
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$fns = '<footnotes>'.$fns.'</footnotes>';
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return preg_replace('#</li>\s*(?=(?:<fn|</footnotes>))#s', '</fn>$1', $fns);
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}
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} |