mirror of
https://tildegit.org/sbgodin/HtmGem.git
synced 2023-08-25 13:53:12 +02:00
300 lines
10 KiB
PHP
300 lines
10 KiB
PHP
<?php
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mb_internal_encoding("UTF-8");
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mb_regex_encoding("UTF-8");
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define("NARROW_NO_BREAK_SPACE", " ");
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define("DASHES"
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,"‒" # U+2012 Figure Dash
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."–" # U+2013 En Dash
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."—" # U+2014 Em Dash
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."⸺" # U+2E3A Two-Em Dash
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."⸻" # U+2E3B Three-Em Dash (Three times larger than a single char)
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);
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$url = @$_REQUEST["url"];
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######################################## Installation page
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if (empty($url)) {
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?>
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<!DOCTYPE html>
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<html lang="fr">
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<head>
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<title>Installation de HtmGem</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<style>
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<?php include("htmgem.css"); ?>
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</style>
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</head>
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<body>
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<?php
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echo translateGemToHtml(@file_get_contents("index.gmi"));
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echo "</body>\n</html>\n";
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die();
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}
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######################################## /Installation page
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# Removes the trailling slash, to be sure there's not any.
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$GMI_DIR = rtrim($_SERVER['DOCUMENT_ROOT'], "/");
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$filePath = $GMI_DIR."/".$url;
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$fileContents = @file_get_contents($filePath);
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######################################## 404 page
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if (empty($fileContents)) {
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http_response_code(404); ?>
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<!DOCTYPE html>
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<html lang="fr">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<style>
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<?php include("htmgem.css"); ?>
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</style>
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</head>
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<body>
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<?php
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$text404 = <<<EOF
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# Page non trouvée
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**$url**
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=> $url rééssayer ?
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=> / index
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EOF;
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echo translateGemToHtml($text404);
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echo "</body>\n</html>";
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die();
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}
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######################################## /404 page
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# Removes the Byte Order Mark
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$fileContents = preg_replace("/\xEF\xBB\xBF/", "", $fileContents);
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/**
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* Replaces markups things like __underlined__ to <u>underlined</u>.
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* @param $instruction the characters to replace, ex. _
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* @param $markup the markup to replace to, ex. "u" to get <u>…</u>
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* @param &$text where to replace.
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*/
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function markupPreg($instruction, $markup, &$text) {
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$output = $text;
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# Replaces couples "__word__" into "<i>word</i>".
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$output = mb_ereg_replace("${instruction}(.+?)${instruction}", "<{$markup}>\\1</{$markup}>", $output);
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# Replaces a remaining __ into "<i>…</i>" to the end of the line.
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$output = mb_ereg_replace("${instruction}(.+)?", "<{$markup}>\\1</{$markup}>", $output);
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$text = $output;
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}
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/**
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* Adds text attributes sucj as underline, bold, … to $line
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* @param $line the line to process
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*/
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function addTextAttributes(&$line) {
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markupPreg("__", "u", $line);
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markupPreg("\*\*", "strong", $line);
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markupPreg("//", "em", $line);
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markupPreg("~~", "del", $line);
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}
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/**
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* Prepares the raw text to be displayed in HTML environment:
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* * Escapes the HTML entities yet contained in the Gemtext.
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* * Puts thin unbrakable spaces before some characters.
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* @param $text1, $text2 texts to process
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*/
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function htmlPrepare(&$text) {
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$text = htmlspecialchars($text, ENT_HTML5|ENT_NOQUOTES, "UTF-8", false);
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$text = mb_ereg_replace("\ ([?!:;»€$])", NARROW_NO_BREAK_SPACE."\\1", $text);
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$text = mb_ereg_replace("([«])\ ", "\\1".NARROW_NO_BREAK_SPACE, $text); # Espace fine insécable
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# Warning: using a monospace font editor may not display dashes as they should be!
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# Adds no-break spaces to stick the (EM/EN dashes) to words : aaaaaa – bb – ccccc ==> aaaaaa –$bb$– ccccc
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$text = mb_ereg_replace("([".DASHES."]) ([^".DASHES.".]+) ([".DASHES."])", "\\1".NARROW_NO_BREAK_SPACE."\\2".NARROW_NO_BREAK_SPACE."\\3", $text);
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# Adds no-break space to stick the (EM/EN dashes) to words : aaaaaa – bb. ==> aaaaaa –$bb.
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$text = mb_ereg_replace("([—–]) ([^.]+).", "\\1".NARROW_NO_BREAK_SPACE."\\2.", $text);
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}
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function translateGemToHtml($fileContents) {
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$fileLines = preg_split("/\n/", $fileContents);
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ob_start();
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$mode = null;
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$mode_textAttributes = true;
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foreach ($fileLines as $line) {
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$reDoCount = 0;
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$mode_textAttributes_temp = false;
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while (true) {
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if ($reDoCount>2) {
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error_log("HtmGem: Too many loops, mode == '$mode'");
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$mode = null;
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$reDoCount = 0;
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break;
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}
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$reDoCount += 1;
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$line1 = substr($line, 0, 1); // $line can be modified
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$line2 = substr($line, 0, 2); // in the meantime.
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$line3 = substr($line, 0, 3);
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if (is_null($mode)) {
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if (empty($line)) {
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echo "<p> </p>\n";
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} elseif ('^^^' == $line3) {
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if (preg_match("/^\^\^\^\s+(.*)$/", $line)) {
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$mode_textAttributes = !$mode_textAttributes;
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} else {
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$mode = "raw";
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continue;
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}
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} elseif ('^' == $line1 and !$mode_textAttributes_temp) {
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preg_match("/^\^\s*(.*)$/", $line, $parts);
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$line = $parts[1];
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$mode_textAttributes_temp = true;
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continue;
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} elseif ("#" == $line1) {
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preg_match("/^(#{1,3})\s*(.*)/", $line, $sharps);
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$h_level = strlen($sharps[1]);
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$text = $sharps[2];
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htmlPrepare($text);
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switch ($h_level) {
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case 1: echo "<h1>".$text."</h1>\n"; break;
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case 2: echo "<h2>".$text."</h2>\n"; break;
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case 3: echo "<h3>".$text."</h3>\n"; break;
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}
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} elseif ("=>" == $line2) {
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if (preg_match("/^=>\s*([^\s]+)(?:\s+(.*))?$/", $line, $linkParts)) {
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$url_link = $linkParts[1];
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$url_label = @$linkParts[2];
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preg_match("/^([^:]+):/", $url_link, $matches);
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$url_protocol = @$matches[1];
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if (empty($url_protocol)) $url_protocol = "local";
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if (empty(trim($url_label))) {
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$url_label = $url_link;
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} else {
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// the label is humain-made, apply formatting
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htmlPrepare($url_label);
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}
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echo "<p><a class='$url_protocol' href='$url_link'>$url_label</a></p>\n";
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} else {
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$mode = "raw";
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continue;
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}
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} elseif ("```" == $line3) {
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if (preg_match("/^```\s*(.*)$/", $line, $matches)) {
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$alt_text = trim(@$matches[1]);
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if (!(empty($alt_text))) {
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echo "<pre alt='$alt_text' title='$alt_text'>\n";
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} else {
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echo "<pre>\n";
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}
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}
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$mode="pre";
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} elseif (">" == $line1) {
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$mode = "quote";
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preg_match("/^>\s*(.*)$/", $line, $quoteParts);
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$quote = $quoteParts[1];
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echo "<blockquote>\n";
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if (empty($quote))
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echo "<p> </p>\n";
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else
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htmlPrepare($quote);
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if ($mode_textAttributes xor $mode_textAttributes_temp) addTextAttributes($line);
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echo "<p>".$quote."</p>\n";
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} elseif ("* " == $line2) {
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echo "<ul>\n";
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$mode = "ul";
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continue;
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} else {
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$mode = "raw";
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continue;
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}
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} else {
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if ("raw"==$mode) {
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htmlPrepare($line);
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if ($mode_textAttributes xor $mode_textAttributes_temp) addTextAttributes($line);
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if (empty($line)) $line = " ";
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echo "<p>$line</p>\n";
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$mode = null;
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} elseif ("pre"==$mode) {
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if ("```" == $line3) {
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echo "</pre>\n";
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$mode = null;
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} else {
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htmlPrepare($line);
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echo $line."\n";
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}
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} elseif ("quote"==$mode) {
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if (">" == $line1) {
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preg_match("/^>\s*(.*)$/", $line, $quoteParts);
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$quote = $quoteParts[1];
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if (empty($quote))
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echo "<p> </p>\n";
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else
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htmlPrepare($quote);
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echo "<p>".$quote."</p>\n";
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} else {
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echo "</blockquote>\n";
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$mode = null;
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continue;
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}
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} elseif ("ul"==$mode) {
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if ("* " == $line2) {
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preg_match("/^\*\s*(.*)$/", $line, $ulParts);
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$li = $ulParts[1];
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if (empty($li)) {
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echo "<li> \n";
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} else {
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htmlPrepare($li);
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if ($mode_textAttributes xor $mode_textAttributes_temp) addTextAttributes($li);
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echo "<li>".$li."\n";
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}
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} else {
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echo "</ul>\n";
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$mode = null;
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continue;
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}
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} else {
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die("Unexpected mode: $mode!");
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}
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}
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break; // exits the while(true) as no continue occured
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}
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}
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$html = ob_get_contents();
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ob_clean();
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return $html;
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}
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# Gets the page title: the first occurrence with # at the line start
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mb_ereg("#\s*([^\n]+)\n", $fileContents, $matches);
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$page_title = @$matches[1];
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# <!-- link type="text/css" rel="StyleSheet" href="/htmgem.css" -->
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echo <<<EOL
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<!DOCTYPE html>
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<html lang="fr">
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<head>
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<title>$page_title</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<style>
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EOL;
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include("htmgem.css");
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echo <<<EOL
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</style>
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</head>
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<body>
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EOL;
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echo "\n".translateGemToHtml($fileContents);
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echo "</body>\n</html>\n";
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ob_end_flush();
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?>
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