Custom PointParser for Markdown implemented.

app/config/config.yml

@@ -79,3 +79,7 @@ swiftmailer:
     username:  "%mailer_user%"
     password:  "%mailer_password%"
     spool:     { type: memory }
+
+knp_markdown:
+    parser:
+        service: markdown.parser.point

src/Skobkin/Bundle/PointToolsBundle/Resources/config/services.yml

@@ -51,3 +51,10 @@ services:
             - @skobkin__point_tools.service_factory.comment_factory
             - @skobkin__point_tools.service_factory.tag_factory
 
+    markdown.parser.point:
+        class: Skobkin\Bundle\PointToolsBundle\Service\Markdown\PointParser
+        arguments:
+            - []
+            - @router
+        tags:
+            - { name: markdown.parser }

src/Skobkin/Bundle/PointToolsBundle/Service/Markdown/PointParser.php

@@ -0,0 +1,206 @@
+<?php
+
+namespace Skobkin\Bundle\PointToolsBundle\Service\Markdown;
+
+use Knp\Bundle\MarkdownBundle\Parser\MarkdownParser;
+use Symfony\Component\Routing\RouterInterface;
+
+class PointParser extends MarkdownParser
+{
+    /**
+     * @var RouterInterface
+     */
+    protected $router;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected $features = array(
+        'header' => true,
+        'list' => true,
+        'horizontal_rule' => true,
+        'table' => false,
+        'foot_note' => true,
+        'fenced_code_block' => true,
+        'abbreviation' => true,
+        'definition_list' => true,
+        'inline_link' => true, // [link text](url "optional title")
+        'reference_link' => true, // [link text] [id]
+        'shortcut_link' => true, // [link text]
+        'images' => true,
+        'block_quote' => true,
+        'code_block' => true,
+        'html_block' => false,
+        'auto_link' => true,
+        'auto_mailto' => true,
+        'entities' => true,
+        'no_html' => true,
+        'point_usernames' => true, // @user
+        'point_posts' => true, // #post
+        'point_tags' => false, // @todo implement
+        'point_inline_images' => true, // https://i.skobk.in/i/facepalm.jpg
+    );
+
+    public function __construct(array $features, RouterInterface $router)
+    {
+        $this->router = $router;
+
+        parent::__construct($features);
+    }
+
+    /**
+     * Point.im breaks Markdown rule about quotation on next line
+     *
+     * @param $text
+     *
+     * @return mixed
+     */
+    protected function doBlockQuotes($text) {
+        $text = preg_replace_callback('/
+              (               # Wrap whole match in $1
+                (?>
+                  ^[ ]*>[ ]?  # ">" at the start of a line
+                    .+\n      # rest of the first line
+                  \n*         # blanks
+                )+
+              )
+            /xm',
+            array($this, '_doBlockQuotes_callback'), $text
+        );
+
+        return $text;
+    }
+
+    /**
+     * Point.im breaks Markdown double line wrap rule
+     *
+     * @param $text
+     *
+     * @return mixed
+     */
+    protected function formParagraphs($text) {
+        #
+        #	Params:
+        #		$text - string to process with html <p> tags
+        #
+        # Strip leading and trailing lines:
+        $text = preg_replace('/\A\n+|\n+\z/', '', $text);
+
+        $grafs = preg_split('/\n+/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+        #
+        # Wrap <p> tags and unhashify HTML blocks
+        #
+        foreach ($grafs as $key => $value) {
+            if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
+                # Is a paragraph.
+                $value = $this->runSpanGamut($value);
+                $value = preg_replace('/^([ ]*)/', "<p>", $value);
+                $value .= "</p>";
+                $grafs[$key] = $this->unhash($value);
+            }
+            else {
+                # Is a block.
+                # Modify elements of @grafs in-place...
+                $graf = $value;
+                $block = $this->html_hashes[$graf];
+                $graf = $block;
+                $grafs[$key] = $graf;
+            }
+        }
+
+        return implode("\n\n", $grafs);
+    }
+
+    /**
+     * @param string $text
+     *
+     * @return string
+     */
+    public function doAutoLinks($text)
+    {
+        if ($this->features['point_inline_images']) {
+            return preg_replace_callback('{((https?):\/\/[^\'">\s]+\.(jpg|jpeg|png|gif))}i', array(&$this, 'doAutoLinksInlineImageCallback'), $text);
+        }
+
+        return parent::doAutoLinks($text);
+    }
+
+    public function doAnchors($text)
+    {
+        $text = parent::doAnchors($text);
+
+        #
+        # Turn Markdown link shortcuts into XHTML <a> tags.
+        #
+        if ($this->in_anchor) {
+            return $text;
+        }
+        $this->in_anchor = true;
+
+        #
+        # Handling username links: @some-point-username
+        #
+        if ($this->features['point_usernames']) {
+            $text = preg_replace_callback('{
+                (               # wrap whole match in $1
+                  @
+                    (
+                        [a-zA-Z0-9\-]+? # username = $2
+                    )
+                )
+                ([^a-zA-Z0-9\-]|$) # Tail of username
+                }xs',
+                array(&$this, 'doAnchorsPointUsernameCallback'), $text);
+        }
+
+        #
+        # Handling post links: #somepost
+        #
+        if ($this->features['point_posts']) {
+            $text = preg_replace_callback('{
+                (               # wrap whole match in $1
+                  \#
+                    (
+                        [a-zA-Z]+? # post id = $2
+                    )
+                )
+                ([^a-zA-Z]|$) # Tail of post
+                }xs',
+                array(&$this, 'doAnchorsPointPostCallback'), $text);
+        }
+
+        $this->in_anchor = false;
+
+        return $text;
+    }
+
+    protected function doAutoLinksInlineImageCallback($matches)
+    {
+        $url = trim($matches[1]);
+        $ext = $matches[2];
+
+        return $this->hashPart('<a href="'.$url.'" class="post-image '
+            .('gif' === $ext ? ' img-gif':'').'"><img src="'.$url.'" class="img-thumbnail" alt="Inline image"></a>');
+    }
+
+    protected function doAnchorsPointUsernameCallback($matches)
+    {
+        //$wholeMatch = $matches[1];
+        $username = $matches[2];
+        $href = $this->router->generate('user_show', ['login' => $username]);
+        $tail = htmlspecialchars($matches[3]);
+        
+        return $this->hashPart('<a href="'.$href.'" class="user">@'.$username.'</a>'.$tail);
+    }
+
+    protected function doAnchorsPointPostCallback($matches)
+    {
+        //$wholeMatch = $matches[1];
+        $postId = $matches[2];
+        $href = $this->router->generate('post_show', ['id' => $postId]);
+        $tail = htmlspecialchars($matches[3]);
+
+        return $this->hashPart('<a href="'.$href.'" class="post">#'.$postId.'</a>'.$tail);
+    }
+}