Sbgodin/HtmGem
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Deep refactoring: parsing, translating, classes

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* Removes "^" to disable text decoration line-wise.
* Split HTML generation in two: parsing and translating.
* Create class to handle gemtext parsing.
* Create class to translate to HTML.
* Create class to generate back gemtext (for future test cases).
* Uses generators to parse then translate.
* Fix: 404 doesn't occur for an empty file.
* Page 404 fully generated by HtmGem itself.
* CSS is no longer incorporated in the HTML page.
* Handle CSS inclusion by addCss() calls.
This commit is contained in:
Christophe HENRY 2021-03-16 20:54:10 +01:00
parent 9726203d07
commit 859b0aad81
4 changed files with 353 additions and 268 deletions
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3
index.gmi
View File

@ -118,8 +118,7 @@ La décoration du texte, qui interprête le **gras** par exemple, ne fait pas pa
### Désactiver la décoration du texte
On peut :
* commencer la ligne par **^**,
* faire un bloc non décoré avec **^^^**,
* désactiver et activer la décoration du texte avec une ligne **^^^**,
* ajouter ce qui suit à la **réécriture** d’URL :
> &textDecoration=0

147
index.php
View File

@ -1,91 +1,61 @@
<?php
require_once "lib-htmgem.php";
use function htmgem\translateGemToHtml;
# to false only if textDecoration=0 in the URL
$textDecoration = "0" != @$_REQUEST['textDecoration'];
/* The url argument is always absolute compared to the document root
* The leading slash is removed. so url=/foo/bar and url=foo/bar ar the same.
*/
# The url argument is always absolute compared to the document root.
$url = @$_REQUEST["url"];
######################################## Installation page
/* Installation page
*
* Accessing directly /htmgem will make display the self-hosted documentation
* contained in "index.gmi". If it's removed, diplay an empty page with a
* comment
*/
if (empty($url)) {
if (!file_exists("index.gmi")) {
http_response_code(403);
die("<!-- index.gmi missing -->");
}
?>
<!DOCTYPE html>
<html lang="fr">
<head>
<title>Installation de HtmGem</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style>
<?php include("css/htmgem.css"); ?>
</style>
</head>
<body>
<?php
echo translateGemToHtml(@file_get_contents("index.gmi"));
echo "</body>\n</html>\n";
die();
$t = new \htmgem\GemTextTranslate_html(@file_get_contents("index.gmi"));
echo $t->getFullHtml();
exit();
}
######################################## /Installation page
# to false only if textDecoration=0 in the URL
$textDecoration = "0" != @$_REQUEST['textDecoration'];
# Removes the headling and trailling slashes, to be sure there's not any.
$filePath = rtrim($_SERVER['DOCUMENT_ROOT'], "/")."/".ltrim($url, "/");
$fileContents = @file_get_contents($filePath);
######################################## 404 page
if (empty($fileContents)) {
/* 404 page
*/
if (!file_exists($filePath)) {
error_log("HtmGem: 404 $url $filePath");
http_response_code(404); ?>
<!DOCTYPE html>
<html lang="fr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style>
<?php include("css/htmgem.css"); ?>
</style>
</head>
<body>
<?php
$text404 = <<<EOF
http_response_code(404);
$page404 = <<<EOF
# ⚠ Page non trouvée
​**$url**
=> $url Recharger 🔄
=> /
EOF;
echo translateGemToHtml($text404);
echo "</body>\n</html>";
die();
$t = new \htmgem\GemTextTranslate_html($page404);
echo $t->getFullHtml();
exit();
}
######################################## /404 page
$fileContents = @file_get_contents($filePath);
# Removes the Byte Order Mark
$fileContents = preg_replace("/\xEF\xBB\xBF/", "", $fileContents);
# Gets the page title: the first occurrence with # at the line start
mb_ereg("#\s*([^\n]+)\n", $fileContents, $matches);
$page_title = @$matches[1];
###################################### CSS Management
/**
* if &style=source displays the source directly and stops.
* if there's a filename.css besides filename.gmi, use the css and stops.
* if &style=<NOTHING> then embbed the default style, and stops.
* if &style=<word not beginngin by slash> then use htmgem/word.css
* if &style=/… then use the … as as stylesheet.
**/
/* CSS and special style management
*/
$style = @$_REQUEST['style'];
if ("source" == $style) {
$basename = basename($filePath);
header("Cache-Control: public");
@ -93,9 +63,12 @@ if ("source" == $style) {
header("Content-Type: text/plain");
header("Content-Transfer-Encoding: binary");
header('Content-Length: ' . filesize($filePath));
readfile($filePath);
echo $fileContents;
exit();
} elseif ("pre" == $style) {
# Gets the page title: the first occurrence with # at the line start
mb_ereg("#\s*([^\n]+)\n", $fileContents, $matches);
$page_title = @$matches[1];
$fileContents = htmlspecialchars($fileContents, ENT_HTML5|ENT_NOQUOTES, "UTF-8", false);
echo <<<EOL
<!DOCTYPE html>
@ -104,52 +77,32 @@ if ("source" == $style) {
<title>$page_title</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<pre>$fileContents</pre>
<pre>
$fileContents</pre>
</body>
</html>
EOL;
exit();
} else {
$parts = pathinfo($filePath);
$localCss = $parts["filename"].".css";
$localCssFilePath = $parts["dirname"]."/".$localCss;
if (file_exists($localCssFilePath)) {
# Warning, using htmhem.php?url=… will make $localCss not found
# as the path is relative to htmgem.php and not / !
$cssContent = "<link type='text/css' rel='StyleSheet' href='$localCss'>";
} else {
if (empty($style)) {
$cssContent =
"<style>\n"
.@file_get_contents("css/htmgem.css")
."</style>\n";
} else {
if ("none" == $style) {
$cssContent = "";
} else {
if ("/" == $style[0])
$href = $style;
else
$href = "/htmgem/css/$style.css";
$cssContent = "<link type='text/css' rel='StyleSheet' href='$href'>";
}
$t = new \htmgem\GemTextTranslate_html($fileContents);
if ("none" == $style) {
$t->addCss("");
} elseif ("/" == @$style[0]) {
$t->addCss($style);
} elseif (empty($style)) {
$parts = pathinfo($filePath);
$localCss = $parts["filename"].".css";
$localCssFilePath = $parts["dirname"]."/".$localCss;
if (file_exists($localCssFilePath)) {
# Warning, using htmhem.php?url=… will make $localCss not found
# as the path is relative to htmgem.php and not / !
$t->addCss($localCss);
}
} else { #TODO: regex check for $style
$t->addCss("/htmgem/css/$style.css");
}
echo <<<EOL
<!DOCTYPE html>
<html lang="fr">
<head>
<title>$page_title</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
$cssContent
</head>
<body>
EOL;
echo "\n".translateGemToHtml($fileContents);
echo "</body>\n</html>\n";
}
ob_end_flush();
echo $t->getFullHtml();
?>

467
lib-htmgem.php
View File

@ -5,203 +5,78 @@ namespace htmgem;
mb_internal_encoding("UTF-8");
mb_regex_encoding("UTF-8");
$style = @$_REQUEST['style'];
define("NARROW_NO_BREAK_SPACE", "&#8239;");
define("DASHES"
,"‒" # U+2012 Figure Dash
."–" # U+2013 En Dash
."—" # U+2014 Em Dash
."⸺" # U+2E3A Two-Em Dash
."⸻" # U+2E3B Three-Em Dash (Three times larger than a single char)
);
/**
* Replaces markups things like __underlined__ to <u>underlined</u>.
* @param $instruction the characters to replace, ex. _
* @param $markup the markup to replace to, ex. "u" to get <u>…</u>
* @param &$text where to replace.
* Parses the gemtext and generates the internal format version
* @param str $fileContents the gemtext to parse
*/
function markupPreg($instruction, $markup, &$text) {
$output = $text;
# Replaces couples "__word__" into "<i>word</i>".
$output = mb_ereg_replace("${instruction}(.+?)${instruction}", "<{$markup}>\\1</{$markup}>", $output);
# Replaces a remaining __ into "<i>…</i>" to the end of the line.
$output = mb_ereg_replace("${instruction}(.+)?", "<{$markup}>\\1</{$markup}>", $output);
$text = $output;
}
/**
* Adds text attributes sucj as underline, bold, … to $line
* @param $line the line to process
*/
function addTextAttributes(&$line) {
global $textDecoration;
if (!$textDecoration) return;
markupPreg("__", "u", $line);
markupPreg("\*\*", "strong", $line);
markupPreg("//", "em", $line);
markupPreg("~~", "del", $line);
}
/**
* Prepares the raw text to be displayed in HTML environment:
* * Escapes the HTML entities yet contained in the Gemtext.
* * Puts thin unbrakable spaces before some characters.
* @param $text1, $text2 texts to process
*/
function htmlPrepare(&$text) {
$text = htmlspecialchars($text, ENT_HTML5|ENT_NOQUOTES, "UTF-8", false);
$text = mb_ereg_replace("\ ([?!:;»€$])", NARROW_NO_BREAK_SPACE."\\1", $text);
$text = mb_ereg_replace("([«])\ ", "\\1".NARROW_NO_BREAK_SPACE, $text); # Espace fine insécable
# Warning: using a monospace font editor may not display dashes as they should be!
# Adds no-break spaces to stick the (EM/EN dashes) to words : aaaaaa – bb – ccccc ==> aaaaaa –$bb$– ccccc
$text = mb_ereg_replace("([".DASHES."]) ([^".DASHES.".]+) ([".DASHES."])", "\\1".NARROW_NO_BREAK_SPACE."\\2".NARROW_NO_BREAK_SPACE."\\3", $text);
# Adds no-break space to stick the (EM/EN dashes) to words : aaaaaa – bb. ==> aaaaaa –$bb.
$text = mb_ereg_replace("([—–]) ([^.]+)\.", "\\1".NARROW_NO_BREAK_SPACE."\\2.", $text);
}
function translateGemToHtml($fileContents) {
$fileLines = preg_split("/\n/", $fileContents);
if (empty($fileLines[-1])) array_pop($fileLines); # Don't output a last empty line
ob_start();
function gemtextParser($fileContents) {
$fileLines = explode("\n", $fileContents);
$mode = null;
$mode_textAttributes = true;
$current = array();
foreach ($fileLines as $line) {
$reDoCount = 0;
$mode_textAttributes_temp = false;
while (true) {
if ($reDoCount>2) {
error_log("HtmGem: Too many loops, mode == '$mode'");
$mode = null;
$reDoCount = 0;
break;
/* The continue instruction is used to make another turn when there is a transition
* between two modes. */
if ($reDoCount>1) {
die("HtmGem: Too many loops, mode == '$mode'");
}
$reDoCount += 1;
$line1 = substr($line, 0, 1); // $line can be modified
$line2 = substr($line, 0, 2); // in the meantime.
$line3 = substr($line, 0, 3);
if (is_null($mode)) {
if (empty($line)) {
echo "<p>&nbsp;</p>\n";
} elseif ('^^^' == $line3) {
$mode_textAttributes = !$mode_textAttributes;
} elseif ('^' == $line1 and !$mode_textAttributes_temp) {
if (preg_match("/^\^\s*(.+)$/", $line, $parts)) {
$line = $parts[1];
$mode_textAttributes_temp = true;
} else {
$mode = "raw";
}
continue;
if ('^^^' == $line3) {
yield array("mode" => "^^^");
} elseif ("#" == $line1) {
if (preg_match("/^(#{1,3})\s*(.+)/", $line, $sharps)) {
$h_level = strlen($sharps[1]);
$text = $sharps[2];
htmlPrepare($text);
switch ($h_level) {
case 1: echo "<h1>".$text."</h1>\n"; break;
case 2: echo "<h2>".$text."</h2>\n"; break;
case 3: echo "<h3>".$text."</h3>\n"; break;
}
} else {
$mode = "raw";
continue;
}
preg_match("/^(#{1,3})\s*(.+)/", $line, $matches);
yield array("mode" => $matches[1], "title" => trim($matches[2]));
} elseif ("=>" == $line2) {
if (preg_match("/^=>\s*([^\s]+)(?:\s+(.*))?$/", $line, $linkParts)) {
$url_link = $linkParts[1];
$url_label = @$linkParts[2];
preg_match("/^([^:]+):/", $url_link, $matches);
$url_protocol = @$matches[1];
if (empty($url_protocol)) $url_protocol = "local";
if (empty(trim($url_label))) {
$url_label = $url_link;
} else {
// the label is humain-made, apply formatting
htmlPrepare($url_label);
if ($mode_textAttributes xor $mode_textAttributes_temp) addTextAttributes($url_label);
}
echo "<p><a class='$url_protocol' href='$url_link'>$url_label</a></p>\n";
} else {
$mode = "raw";
continue;
}
preg_match("/^=>\s*([^\s]+)(?:\s+(.*))?$/", $line, $matches);
yield array("mode" => "=>", "link" => trim($matches[1]), "text" => trim(@$matches[2]));
} elseif ("```" == $line3) {
preg_match("/^```\s*(.*)$/", $line, $matches);
$alt_text = trim($matches[1]);
if (empty($alt_text)) {
echo "<pre>\n";
} else {
echo "<pre alt='$alt_text' title='$alt_text'>\n";
}
$mode="pre";
$current = array("mode" => "```", "alt" => trim($matches[1]), "texts" => array());
$mode="```";
} elseif (">" == $line1) {
echo "<blockquote>\n";
$mode = "quote";
continue;
preg_match("/^>\s*(.*)$/", $line, $matches);
$current = array("mode" => ">", "texts" => array(trim($matches[1])));
$mode = ">";
} elseif ("*" == $line1) {
echo "<ul>\n";
$mode = "ul";
continue;
preg_match("/^\*\s*(.*)$/", $line, $matches);
$current = array("mode" => "*", "texts" => array(trim($matches[1])));
$mode = "*";
} else {
$mode = "raw";
continue;
// text_line
yield array("mode"=>"", "text" => trim($line));
}
} else {
if ("raw"==$mode) {
if (empty($line)) {
$line = "&nbsp;";
} else {
htmlPrepare($line);
if ($mode_textAttributes xor $mode_textAttributes_temp)
addTextAttributes($line);
}
echo "<p>$line</p>\n";
$mode = null;
} elseif ("pre"==$mode) {
if ("```"==$mode) {
if ("```" == $line3) {
echo "</pre>\n";
yield $current;
$current = array();
$mode = null;
} else {
htmlPrepare($line);
echo $line."\n";
$current["texts"] []= $line; // No trim() as it’s a preformated text!
}
} elseif ("quote"==$mode) {
} elseif (">"==$mode) {
if (">" == $line1) {
preg_match("/^>\s*(.*)$/", $line, $quoteParts);
$quote = $quoteParts[1];
if (empty($quote))
echo "<p>&nbsp;</p>\n";
else {
htmlPrepare($quote);
if ($mode_textAttributes xor $mode_textAttributes_temp)
addTextAttributes($line);
echo "<p>".$quote."</p>\n";
}
preg_match("/^>\s*(.*)$/", $line, $matches);
$current["texts"] []= trim($matches[1]);
} else {
echo "</blockquote>\n";
yield $current;
$current = array();
$mode = null;
continue;
}
} elseif ("ul"==$mode) {
} elseif ("*"==$mode) {
if ("*" == $line1) {
preg_match("/^\*\s*(.*)$/", $line, $ulParts);
$li = $ulParts[1];
if (empty($li)) {
echo "<li>&nbsp;\n";
} else {
htmlPrepare($li);
if ($mode_textAttributes xor $mode_textAttributes_temp) addTextAttributes($li);
echo "<li>".$li."\n";
}
preg_match("/^\*\s*(.*)$/", $line, $matches);
$current["texts"] []= trim($matches[1]);
} else {
echo "</ul>\n";
yield $current;
$current = array();
$mode = null;
continue;
}
@ -211,10 +86,266 @@ function translateGemToHtml($fileContents) {
}
break; // exits the while(true) as no continue occured
} // while(true)
}// foreach
if ($current) yield $current; # File ends before the block.
} // gemtextParser
/**
* Translates the internal format into a gemtext.
* Uses cases:
*
* - test suites
* - serialisation easier with a text content
* - normalization (trimming spaces for instance)
*/
class GemtextTranslate_gemtext {
function __construct($parsedGemtext) {
$this->parsedGemtext = $parsedGemtext;
$this->translate();
}
$html = ob_get_contents();
ob_clean();
return $html;
}
protected function translate() {
ob_start();
foreach ($this->parsedGemtext as $node) {
$mode = $node["mode"];
switch($mode) {
case "":
echo $node["text"]."\n";
break;
case "*":
foreach ($node["texts"] as $text) {
echo "* $text\n";
}
break;
case "```":
print("```\n");
foreach ($node["texts"] as $text) {
echo "$text\n";
}
print("```\n");
break;
case ">":
foreach ($node["texts"] as $text) {
echo "> $text\n";
}
break;
case "=>":
$linkText = $node["text"];
if (!empty($linkText)) $linkText = " $linkText";
print("=> ".$node["link"].$linkText."\n");
break;
case "#":
case "##":
case "###":
print("$mode ".$node["title"]."\n");
break;
case "^^^":
print("^^^\n");
break;
default:
die("Unknown mode: '{$node["mode"]}'\n");
}
}
$this->translatedGemtext = ob_get_contents();
ob_end_clean();
}
public function __toString() {
return $this->translatedGemtext;
}
} // GemtextTranslate_gemtext
/**
* Translates the internal format to HTML
*/
class GemtextTranslate_html {
protected $cssList = array();
protected $pageTitle = "";
public $translatedGemtext;
function __construct($parsedGemtext, $textDecorationEnabled=true) {
if (empty($parsedGemtext))
// So translate() will do no loop.
$parsedGemtext = array();
elseif (is_string($parsedGemtext))
// to delete the last empty line, <p>&nbsp;</p> in HTML
$parsedGemtext = rtrim($parsedGemtext);
// The text must be parsed
$parsedGemtext = gemtextParser($parsedGemtext);
$this->parsedGemtext = $parsedGemtext;
$this->translate($textDecorationEnabled);
}
function addCss($css) {
$this->cssList []= $css;
}
const NARROW_NO_BREAK_SPACE = "&#8239;";
const DASHES
="‒" # U+2012 Figure Dash
."–" # U+2013 En Dash
."—" # U+2014 Em Dash
."⸺" # U+2E3A Two-Em Dash
."⸻" # U+2E3B Three-Em Dash (Three times larger than a single char)
;
/**
* Replaces markups things like __underlined__ to <u>underlined</u>.
* @param $instruction the characters to replace, ex. _
* @param $markup the markup to replace to, ex. "u" to get <u>…</u>
* @param &$text where to replace.
*/
protected static function markupPreg($instruction, $markup, &$text) {
$output = $text;
# Replaces couples "__word__" into "<i>word</i>".
$output = mb_ereg_replace("${instruction}(.+?)${instruction}", "<{$markup}>\\1</{$markup}>", $output);
# Replaces a remaining __ into "<i>…</i>" to the end of the line.
$output = mb_ereg_replace("${instruction}(.+)?", "<{$markup}>\\1</{$markup}>", $output);
$text = $output;
}
/**
* Adds text attributes sucj as underline, bold, … to $line
* @param $line the line to process
*/
protected static function addTextDecoration(&$line) {
self::markupPreg("__", "u", $line);
self::markupPreg("\*\*", "strong", $line);
self::markupPreg("//", "em", $line);
self::markupPreg("~~", "del", $line);
}
/**
* Prepares the raw text to be displayed in HTML environment:
* * Escapes the HTML entities yet contained in the Gemtext.
* * Puts thin unbrakable spaces before some characters.
* @param $text1, $text2 texts to process
*/
protected static function htmlPrepare(&$text) {
if (empty($text)) {
$text = "&nbsp;";
} else {
$text = htmlspecialchars($text, ENT_HTML5|ENT_NOQUOTES, "UTF-8", false);
$text = mb_ereg_replace("\ ([?!:;»€$])", self::NARROW_NO_BREAK_SPACE."\\1", $text);
$text = mb_ereg_replace("([«])\ ", "\\1".self::NARROW_NO_BREAK_SPACE, $text); # Espace fine insécable
# Warning: using a monospace font editor may not display dashes as they should be!
# Adds no-break spaces to stick the (EM/EN dashes) to words : aaaaaa – bb – ccccc ==> aaaaaa –$bb$– ccccc
$text = mb_ereg_replace("([".self::DASHES."]) ([^".self::DASHES.".]+) ([".self::DASHES."])", "\\1".self::NARROW_NO_BREAK_SPACE."\\2".self::NARROW_NO_BREAK_SPACE."\\3", $text);
# Adds no-break space to stick the (EM/EN dashes) to words : aaaaaa – bb. ==> aaaaaa –$bb.
$text = mb_ereg_replace("([—–]) ([^.]+)\.", "\\1".self::NARROW_NO_BREAK_SPACE."\\2.", $text);
}
}
public function translate($textDecoration=true) {
ob_start();
foreach ($this->parsedGemtext as $node) {
$mode = $node["mode"];
switch($mode) {
case "":
$text = $node["text"];
self::htmlPrepare($text);
if ($textDecoration) self::addTextDecoration($text);
echo "<p>$text</p>\n";
break;
case "*":
echo "<ul>\n";
foreach ($node["texts"] as $text) {
self::htmlPrepare($text);
if ($textDecoration) self::addTextDecoration($text);
print("<li>$text\n");
}
echo "</ul>\n";
break;
case "```":
$text = implode("\n", $node["texts"]);
self::htmlPrepare($text);
echo "<pre>\n$text\n</pre>\n";
break;
case ">":
$text = implode("\n", $node["texts"]);
self::htmlPrepare($text);
if ($textDecoration) self::addTextDecoration($text);
echo "<blockquote>\n$text\n</blockquote>\n";
break;
case "=>":
$link = $node["link"];
$linkText = $node["text"];
if (empty($linkText)) {
$linkText = $link;
self::htmlPrepare($linkText);
} else {
self::htmlPrepare($linkText);
if ($textDecoration) self::addTextDecoration($linkText);
}
preg_match("/^([^:]+):/", $link, $matches);
$protocol = @$matches[1];
if (empty($protocol)) $protocol = "local";
echo "<p><a class='$protocol' href='$link'>$linkText</a></p>\n";
break;
case "#":
$title = $node["title"];
self::htmlPrepare($title);
if (empty($this->pageTitle)) $this->pageTitle = $title;
echo "<h1>$title</h1>\n";
break;
case "##":
$title = $node["title"];
self::htmlPrepare($title);
echo "<h2>$title</h2>\n";
break;
case "###":
$title = $node["title"];
self::htmlPrepare($title);
echo "<h3>$title</h3>\n";
break;
case "^^^":
$this->textDecorationEnabled = !$this->textDecorationEnabled;
break;
default:
die("Unknown mode: '{$node["mode"]}'\n");
}
}
$this->translatedGemtext = ob_get_contents();
ob_end_clean();
}
function getFullHtml() {
if (!$this->cssList)
$css = array("/htmgem/css/htmgem.css");
else
$css = $this->cssList;
echo <<<EOL
<!DOCTYPE html>
<html>
<head>
<title>{$this->pageTitle}</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
EOL;
foreach ($css as $c) {
echo "<link type='text/css' rel='StyleSheet' href='$c'>\n";
}
echo <<<EOL
</head>
<body>\n
EOL;
echo $this->translatedGemtext;
echo "</body>\n</html>\n";
}
public function __toString() {
return $this->translatedGemtext;
}
} // GemTextTranslate_html
?>

4
tutogemtext.gmi
View File

@ -53,9 +53,11 @@ Il ne peut exister qu’un lien par ligne. Et la ligne est dédiée à ça ! Voi
La décoration du texte ne fait pas partie des spécifications de Gemini.
^ Cette **ligne** utilise la //décoration du texte// qui peut ~~barrer~~ ou __souligner__ des mots.
Cette *​*ligne*​* utilise la /​/décoration du texte/​/ qui peut ~​~barrer~​~ ou _​_souligner_​_ des mots.
Cette **ligne** utilise la //décoration du texte// qui peut ~~barrer~~ ou __souligner__ des mots.
On peut désactiver et activer la décoration du texte avec **^^^** sur une ligne.
Et voilà ! Vous savez tout ce qui est à savoir 🥳 Les spécifications complètes sont sur le site de Gemini :
=> https://gemini.circumlunar.space/docs/specification.gmi