HtmGem/lib-htmgem.php

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PHP
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<?php
namespace htmgem;
mb_internal_encoding("UTF-8");
mb_regex_encoding("UTF-8");
/**
* Parses the gemtext and generates the internal format version
* @param str $fileContents the gemtext to parse
*/
function gemtextParser($fileContents) {
$fileLines = explode("\n", $fileContents);
$mode = null;
$current = array();
foreach ($fileLines as $line) {
$reDoCount = 0;
$mode_textAttributes_temp = false;
while (true) {
/* The continue instruction is used to make another turn when there is a transition
* between two modes. */
if ($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 ('^^^' == $line3) {
yield array("mode" => "^^^");
} elseif ("#" == $line1) {
preg_match("/^(#{1,3})\s*(.+)/", $line, $matches);
yield array("mode" => $matches[1], "title" => trim($matches[2]));
} elseif ("=>" == $line2) {
preg_match("/^=>\s*([^\s]+)(?:\s+(.*))?$/", $line, $matches);
yield array("mode" => "=>", "link" => trim($matches[1]), "text" => trim(@$matches[2]));
} elseif ("```" == $line3) {
preg_match("/^```\s*(.*)$/", $line, $matches);
$current = array("mode" => "```", "alt" => trim($matches[1]), "texts" => array());
$mode="```";
} elseif (">" == $line1) {
preg_match("/^>\s*(.*)$/", $line, $matches);
$current = array("mode" => ">", "texts" => array(trim($matches[1])));
$mode = ">";
} elseif ("*" == $line1) {
preg_match("/^\*\s*(.*)$/", $line, $matches);
$current = array("mode" => "*", "texts" => array(trim($matches[1])));
$mode = "*";
} else {
// text_line
yield array("mode"=>"", "text" => trim($line));
}
} else {
if ("```"==$mode) {
if ("```" == $line3) {
yield $current;
$current = array();
$mode = null;
} else {
$current["texts"] []= $line; // No trim() as its a preformated text!
}
} elseif (">"==$mode) {
if (">" == $line1) {
preg_match("/^>\s*(.*)$/", $line, $matches);
$current["texts"] []= trim($matches[1]);
} else {
yield $current;
$current = array();
$mode = null;
continue;
}
} elseif ("*"==$mode) {
if ("*" == $line1) {
preg_match("/^\*\s*(.*)$/", $line, $matches);
$current["texts"] []= trim($matches[1]);
} else {
yield $current;
$current = array();
$mode = null;
continue;
}
} else {
die("Unexpected mode: $mode!");
}
}
break; // exits the while(true) as no continue occured
} // while(true)
}// foreach
if ($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;
$this->translate();
}
protected function translate() {
ob_start();
foreach ($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))
$parsedGemtext = "";
elseif (is_string($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
?>