[ 
https://issues.apache.org/jira/browse/DOXIA-616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17256127#comment-17256127
 ] 

ASF GitHub Bot commented on DOXIA-616:
--------------------------------------

michael-o commented on a change in pull request #49:
URL: https://github.com/apache/maven-doxia/pull/49#discussion_r549815437



##########
File path: 
doxia-modules/doxia-module-markdown/src/main/java/org/apache/maven/doxia/module/markdown/MarkdownParser.java
##########
@@ -130,133 +191,98 @@ public void parse( Reader source, Sink sink )
      * @return HTML content generated by flexmark-java
      * @throws IOException passed through
      */
-    String toHtml( Reader source )
+    CharSequence toHtml( Reader source )
         throws IOException
     {
+        // Read the source
         String text = IOUtil.toString( source );
-        MutableDataHolder flexmarkOptions = 
PegdownOptionsAdapter.flexmarkOptions(
-                Extensions.ALL & ~( Extensions.HARDWRAPS | 
Extensions.ANCHORLINKS ) ).toMutable();
-        ArrayList<Extension> extensions = new ArrayList<>();
-        for ( Extension extension : flexmarkOptions.get( 
com.vladsch.flexmark.parser.Parser.EXTENSIONS ) )
-        {
-            extensions.add( extension );
-        }
-
-        extensions.add( FlexmarkDoxiaExtension.create() );
-        flexmarkOptions.set( com.vladsch.flexmark.parser.Parser.EXTENSIONS, 
extensions );
-        flexmarkOptions.set( HtmlRenderer.HTML_BLOCK_OPEN_TAG_EOL, false );
-        flexmarkOptions.set( HtmlRenderer.HTML_BLOCK_CLOSE_TAG_EOL, false );
-        flexmarkOptions.set( HtmlRenderer.MAX_TRAILING_BLANK_LINES, -1 );
-
-        com.vladsch.flexmark.parser.Parser parser = 
com.vladsch.flexmark.parser.Parser.builder( flexmarkOptions )
-                .build();
-        HtmlRenderer renderer = HtmlRenderer.builder( flexmarkOptions )
-                                    .linkResolverFactory( new 
FlexmarkDoxiaLinkResolver.Factory() )
-                                    .build();
-
 
+        // Now, build the HTML document
         StringBuilder html = new StringBuilder( 1000 );
         html.append( "<html>" );
         html.append( "<head>" );
-        Pattern metadataPattern = Pattern.compile( 
MULTI_MARKDOWN_METADATA_SECTION, Pattern.MULTILINE );
-        Matcher metadataMatcher = metadataPattern.matcher( text );
+
+        // First, we interpret the "metadata" section of the document and add 
the corresponding HTML headers
+        Matcher metadataMatcher = METADATA_SECTION_PATTERN.matcher( text );
         boolean haveTitle = false;
         if ( metadataMatcher.find() )
         {
-            metadataPattern = Pattern.compile( MULTI_MARKDOWN_METADATA_ENTRY, 
Pattern.MULTILINE );
-            Matcher lineMatcher = metadataPattern.matcher( 
metadataMatcher.group( 1 ) );
-            boolean first = true;
-            while ( lineMatcher.find() )
+            Matcher entryMatcher = METADATA_ENTRY_PATTERN.matcher( 
metadataMatcher.group( 0 ) );
+            while ( entryMatcher.find() )
             {
-                String key = StringUtils.trimToEmpty( lineMatcher.group( 1 ) );
-                if ( first )
-                {
-                    boolean found = false;
-                    for ( String k : STANDARD_METADATA_KEYS )
-                    {
-                        if ( k.equalsIgnoreCase( key ) )
-                        {
-                            found = true;
-                            break;
-                        }
-                    }
-                    if ( !found )
-                    {
-                        break;
-                    }
-                    first = false;
-                }
-                String value = StringUtils.trimToEmpty( lineMatcher.group( 2 ) 
);
+                String key = entryMatcher.group( 1 );
+                String value = entryMatcher.group( 2 );
                 if ( "title".equalsIgnoreCase( key ) )
                 {
                     haveTitle = true;
                     html.append( "<title>" );
-                    html.append( StringEscapeUtils.escapeXml( value ) );
+                    html.append( HtmlTools.escapeHTML( value, false ) );
                     html.append( "</title>" );
                 }
-                else if ( "author".equalsIgnoreCase( key ) )
-                {
-                    html.append( "<meta name=\'author\' content=\'" );
-                    html.append( StringEscapeUtils.escapeXml( value ) );
-                    html.append( "\' />" );
-                }
-                else if ( "date".equalsIgnoreCase( key ) )
-                {
-                    html.append( "<meta name=\'date\' content=\'" );
-                    html.append( StringEscapeUtils.escapeXml( value ) );
-                    html.append( "\' />" );
-                }
                 else
                 {
-                    html.append( "<meta name=\'" );
-                    html.append( StringEscapeUtils.escapeXml( key ) );
-                    html.append( "\' content=\'" );
-                    html.append( StringEscapeUtils.escapeXml( value ) );
-                    html.append( "\' />" );
+                    html.append( "<meta name='" );
+                    html.append( HtmlTools.escapeHTML( key, true ) );

Review comment:
       I understand that, but the Sink says XHTML, so we need at least XML 
escapes. Just checked the code, all is fine. It runs in XML mode. You can drop 
the `true`. This is the default value.

##########
File path: 
doxia-modules/doxia-module-markdown/src/main/java/org/apache/maven/doxia/module/markdown/MarkdownParser.java
##########
@@ -130,133 +191,98 @@ public void parse( Reader source, Sink sink )
      * @return HTML content generated by flexmark-java
      * @throws IOException passed through
      */
-    String toHtml( Reader source )
+    CharSequence toHtml( Reader source )
         throws IOException
     {
+        // Read the source
         String text = IOUtil.toString( source );
-        MutableDataHolder flexmarkOptions = 
PegdownOptionsAdapter.flexmarkOptions(
-                Extensions.ALL & ~( Extensions.HARDWRAPS | 
Extensions.ANCHORLINKS ) ).toMutable();
-        ArrayList<Extension> extensions = new ArrayList<>();
-        for ( Extension extension : flexmarkOptions.get( 
com.vladsch.flexmark.parser.Parser.EXTENSIONS ) )
-        {
-            extensions.add( extension );
-        }
-
-        extensions.add( FlexmarkDoxiaExtension.create() );
-        flexmarkOptions.set( com.vladsch.flexmark.parser.Parser.EXTENSIONS, 
extensions );
-        flexmarkOptions.set( HtmlRenderer.HTML_BLOCK_OPEN_TAG_EOL, false );
-        flexmarkOptions.set( HtmlRenderer.HTML_BLOCK_CLOSE_TAG_EOL, false );
-        flexmarkOptions.set( HtmlRenderer.MAX_TRAILING_BLANK_LINES, -1 );
-
-        com.vladsch.flexmark.parser.Parser parser = 
com.vladsch.flexmark.parser.Parser.builder( flexmarkOptions )
-                .build();
-        HtmlRenderer renderer = HtmlRenderer.builder( flexmarkOptions )
-                                    .linkResolverFactory( new 
FlexmarkDoxiaLinkResolver.Factory() )
-                                    .build();
-
 
+        // Now, build the HTML document
         StringBuilder html = new StringBuilder( 1000 );
         html.append( "<html>" );
         html.append( "<head>" );
-        Pattern metadataPattern = Pattern.compile( 
MULTI_MARKDOWN_METADATA_SECTION, Pattern.MULTILINE );
-        Matcher metadataMatcher = metadataPattern.matcher( text );
+
+        // First, we interpret the "metadata" section of the document and add 
the corresponding HTML headers
+        Matcher metadataMatcher = METADATA_SECTION_PATTERN.matcher( text );
         boolean haveTitle = false;
         if ( metadataMatcher.find() )
         {
-            metadataPattern = Pattern.compile( MULTI_MARKDOWN_METADATA_ENTRY, 
Pattern.MULTILINE );
-            Matcher lineMatcher = metadataPattern.matcher( 
metadataMatcher.group( 1 ) );
-            boolean first = true;
-            while ( lineMatcher.find() )
+            Matcher entryMatcher = METADATA_ENTRY_PATTERN.matcher( 
metadataMatcher.group( 0 ) );
+            while ( entryMatcher.find() )
             {
-                String key = StringUtils.trimToEmpty( lineMatcher.group( 1 ) );
-                if ( first )
-                {
-                    boolean found = false;
-                    for ( String k : STANDARD_METADATA_KEYS )
-                    {
-                        if ( k.equalsIgnoreCase( key ) )
-                        {
-                            found = true;
-                            break;
-                        }
-                    }
-                    if ( !found )
-                    {
-                        break;
-                    }
-                    first = false;
-                }
-                String value = StringUtils.trimToEmpty( lineMatcher.group( 2 ) 
);
+                String key = entryMatcher.group( 1 );
+                String value = entryMatcher.group( 2 );
                 if ( "title".equalsIgnoreCase( key ) )
                 {
                     haveTitle = true;
                     html.append( "<title>" );
-                    html.append( StringEscapeUtils.escapeXml( value ) );
+                    html.append( HtmlTools.escapeHTML( value, false ) );
                     html.append( "</title>" );
                 }
-                else if ( "author".equalsIgnoreCase( key ) )
-                {
-                    html.append( "<meta name=\'author\' content=\'" );
-                    html.append( StringEscapeUtils.escapeXml( value ) );
-                    html.append( "\' />" );
-                }
-                else if ( "date".equalsIgnoreCase( key ) )
-                {
-                    html.append( "<meta name=\'date\' content=\'" );
-                    html.append( StringEscapeUtils.escapeXml( value ) );
-                    html.append( "\' />" );
-                }
                 else
                 {
-                    html.append( "<meta name=\'" );
-                    html.append( StringEscapeUtils.escapeXml( key ) );
-                    html.append( "\' content=\'" );
-                    html.append( StringEscapeUtils.escapeXml( value ) );
-                    html.append( "\' />" );
+                    html.append( "<meta name='" );
+                    html.append( HtmlTools.escapeHTML( key, true ) );
+                    html.append( "' content='" );
+                    html.append( HtmlTools.escapeHTML( value, true ) );
+                    html.append( "' />" );
                 }
             }
-            if ( !first )
-            {
-                text = text.substring( metadataMatcher.end() );
-            }
+
+            // Trim the metadata from the source
+            text = text.substring( metadataMatcher.end( 0 ) );
+
         }
 
-        Node rootNode = parser.parse( text );
-        String markdownHtml = renderer.render( rootNode );
+        // Now is the time to parse the Markdown document
+        // (after we've trimmed out the metadatas, and before we check for its 
headings)
+        Node documentRoot = FLEXMARK_PARSER.parse( text );
 
-        if ( !haveTitle && rootNode.hasChildren() )
+        // Special trick: if there is no title specified as a metadata in the 
header, we will use the first
+        // heading as the document title
+        if ( !haveTitle && documentRoot.hasChildren() )
         {
-            // use the first (non-comment) node only if it is a heading
-            Node firstNode = rootNode.getFirstChild();
-            while ( firstNode != null && !( firstNode instanceof Heading ) )
+            // Skip the comment nodes
+            Node firstNode = documentRoot.getFirstChild();
+            while ( firstNode != null && firstNode instanceof HtmlCommentBlock 
)

Review comment:
       OK.




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> Markdown: Properly expose the language specified in fenced code blocks
> ----------------------------------------------------------------------
>
>                 Key: DOXIA-616
>                 URL: https://issues.apache.org/jira/browse/DOXIA-616
>             Project: Maven Doxia
>          Issue Type: Improvement
>          Components: Module - Markdown
>    Affects Versions: 1.8, 1.9, 1.9.1
>            Reporter: Bertrand Martin
>            Assignee: Michael Osipov
>            Priority: Major
>             Fix For: 1.9.2
>
>
> h1. Use Case
> Writers can specify the language used in a fenced code block (typically for 
> syntax highlighting), as in the example below:
> {code}
> ```java
> System.out.println("Beautiful\n");
> ```
> {code}
> Currently, the Doxia module for Markdown does not expose this information 
> ("java") in the produced HTML, so a Maven skin (or frontend renderer) cannot 
> leverage it.
> Produced HTML:
> {code:html}
> <div class="source"> <!-- No mention of Java :-( -->
> <pre>
> System.out.println("Beautiful\n");
> </pre>
> </div>
> {code}
> Wanted result:
> {code:html}
> <div class="source java"> <!-- :-) -->
> <pre>
> System.out.println("Beautiful\n");
> </pre>
> </div>
> {code}
> h1. Specification
> Un-comment this block:
> https://github.com/apache/maven-doxia/blob/c439714e8f4a9e86f9962ac6be9a0077ae9b4d30/doxia-modules/doxia-module-markdown/src/main/java/org/apache/maven/doxia/module/markdown/FlexmarkDoxiaNodeRenderer.java#L103
> This should do the trick.



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