1 files changed, 126 insertions, 0 deletions
diff --git a/bootstrap/comments/backend/classes/markdown.php b/bootstrap/comments/backend/classes/markdown.php
new file mode 100644
index 0000000..bf278b7
--- /dev/null
+++ b/bootstrap/comments/backend/classes/markdown.php
@@ -0,0 +1,126 @@
+<?php namespace HashOver;
+
+// Copyright (C) 2015-2018 Jacob Barkdull
+// This file is part of HashOver.
+//
+// HashOver is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// HashOver is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with HashOver.  If not, see <http://www.gnu.org/licenses/>.
+
+
+class Markdown
+{
+	public    $blockCodeRegex = '/```([\s\S]+?)```/S';
+	protected $paragraphRegex = '/(?:\r\n|\r|\n){2}/S';
+	public    $inlineCodeRegex = '/(^|[^a-z0-9`])`([^`]+?[\s\S]+?)`([^a-z0-9`]|$)/iS';
+
+	// Array for inline code and code block markers
+	protected $codeMarkers = array (
+		'block' => array ('marks' => array (), 'count' => 0),
+		'inline' => array ('marks' => array (), 'count' => 0)
+	);
+
+	// Markdown patterns to search for
+	public $search = array (
+		'/\*\*([^ *])([\s\S]+?)([^ *])\*\*/S',
+		'/\*([^ *])([\s\S]+?)([^ *])\*/S',
+		'/(^|\W)_([^_]+?[\s\S]+?)_(\W|$)/S',
+		'/__([^ _])([\s\S]+?)([^ _])__/S',
+		'/~~([^ ~])([\s\S]+?)([^ ~])~~/S'
+	);
+
+	// HTML replacements for markdown patterns
+	public $replace = array (
+		'<strong>\\1\\2\\3</strong>',
+		'<em>\\1\\2\\3</em>',
+		'\\1<u>\\2</u>\\3',
+		'<u>\\1\\2\\3</u>',
+		'<s>\\1\\2\\3</s>'
+	);
+
+	// Replaces markdown for inline code with a marker
+	protected function codeReplace ($grp, $display)
+	{
+		$markName = 'CODE_' . strtoupper ($display);
+		$markCount = $this->codeMarkers[$display]['count']++;
+
+		if ($display !== 'block') {
+			$codeMarker = $grp[1] . $markName . '[' . $markCount . ']' . $grp[3];
+			$this->codeMarkers[$display]['marks'][$markCount] = trim ($grp[2], "\r\n");
+		} else {
+			$codeMarker = $markName . '[' . $markCount . ']';
+			$this->codeMarkers[$display]['marks'][$markCount] = trim ($grp[1], "\r\n");
+		}
+
+		return $codeMarker;
+	}
+
+	// Replaces markdown for code block with a marker
+	protected function blockCodeReplace ($grp)
+	{
+		return $this->codeReplace ($grp, 'block');
+	}
+
+	// Replaces markdown for inline code with a marker
+	protected function inlineCodeReplace ($grp)
+	{
+		return $this->codeReplace ($grp, 'inline');
+	}
+
+	// Returns the original inline markdown code with HTML replacement
+	protected function inlineCodeReturn ($grp)
+	{
+		return '<code class="hashover-inline">' . $this->codeMarkers['inline']['marks'][($grp[1])] . '</code>';
+	}
+
+	// Returns the original markdown code block with HTML replacement
+	protected function blockCodeReturn ($grp)
+	{
+		return '<code>' . $this->codeMarkers['block']['marks'][($grp[1])] . '</code>';
+	}
+
+	// Parses a string as markdown
+	public function parseMarkdown ($string)
+	{
+		// Reset marker arrays
+		$this->codeMarkers = array (
+			'block' => array ('marks' => array (), 'count' => 0),
+			'inline' => array ('marks' => array (), 'count' => 0)
+		);
+
+		// Replace code blocks with markers
+		$string = preg_replace_callback ($this->blockCodeRegex, 'self::blockCodeReplace', $string);
+
+		// Break string into paragraphs
+		$paragraphs = preg_split ($this->paragraphRegex, $string);
+
+		// Run through each paragraph
+		for ($i = 0, $il = count ($paragraphs); $i < $il; $i++) {
+			// Replace inline code with markers
+			$paragraphs[$i] = preg_replace_callback ($this->inlineCodeRegex, 'self::inlineCodeReplace', $paragraphs[$i]);
+
+			// Replace markdown patterns
+			$paragraphs[$i] = preg_replace ($this->search, $this->replace, $paragraphs[$i]);
+
+			// Replace markers with original markdown code
+			$paragraphs[$i] = preg_replace_callback ('/CODE_INLINE\[([0-9]+)\]/S', 'self::inlineCodeReturn', $paragraphs[$i]);
+		}
+
+		// Join paragraphs
+		$string = implode (PHP_EOL . PHP_EOL, $paragraphs);
+
+		// Replace code block markers with original markdown code
+		$string = preg_replace_callback ('/CODE_BLOCK\[([0-9]+)\]/S', 'self::blockCodeReturn', $string);
+
+		return $string;
+	}
+}