extesion: introduce <figure>-wrapped images as block elements

diff --git a/markdown.awk b/markdown.awk
index 4f18b9ba499685017a6fcef4ab25c5a5a581c392..fa60543b49d43ed013325bf939e2d93ed22e7a5b 100755 (executable)
--- a/markdown.awk
+++ b/markdown.awk
@@ -42,6 +42,8 @@
 # - [x] Automatic heading identifiers (custom)
 # - [x] Fenced code blocks (php md, pandoc)
 #   - [x] Fenced code attributes
+# - [x] Images (as block elements, <figure>-wrapped) (custom)
+#   - [x] reference style block images
 # - [/] Tables
 #   -  ?  Simple table (pandoc)
 #   -  ?  Multiline table (pandoc)
@@ -554,6 +556,58 @@ function _block( block, LOCAL, st, len, hlvl, htxt, guard, code, indent, attrib
            "<a class=\"anchor\" href=\"#" hid "\"></a></h" hlvl ">\n\n" \
            _block( substr( block, len + 1) );
 
+  # block images (wrapped in <figure>)
+  } else if ( match(block, /^!\[([^]]+)\]\(([^"\)]+)([ \t]+"([^"]+)")?\)(\{([a-zA-Z \t-]*)\})?(\n|$)/) ) {
+    len = RLENGTH;
+    text   = gensub(/^!\[([^]]+)\]\(([^"\)]+)([ \t]+"([^"]+)")?\)(\{([a-zA-Z \t-]*)\})?(\n.*)?$/, "\\1", "g", block);
+    href   = gensub(/^!\[([^]]+)\]\(([^"\)]+)([ \t]+"([^"]+)")?\)(\{([a-zA-Z \t-]*)\})?(\n.*)?$/, "\\2", "g", block);
+    title  = gensub(/^!\[([^]]+)\]\(([^"\)]+)([ \t]+"([^"]+)")?\)(\{([a-zA-Z \t-]*)\})?(\n.*)?$/, "\\4", "g", block);
+    attrib = gensub(/^!\[([^]]+)\]\(([^"\)]+)([ \t]+"([^"]+)")?\)(\{([a-zA-Z \t-]*)\})?(\n.*)?$/, "\\6", "g", block);
+    if ( title && attrib ) {
+      return "<figure data-src=\"" URL(href) "\" class=\"" HTML(attrib) "\">" \
+               "<img src=\"" URL(href) "\" alt=\"" HTML(text) "\" class=\"" HTML(attrib) "\">" \
+               "<figcaption>" inline(title) "</figcaption>" \
+             "</figure>\n\n" \
+             _block( substr( block, len + 1) );
+    } else if ( title ) {
+      return "<figure data-src=\"" URL(href) "\">" \
+               "<img src=\"" URL(href) "\" alt=\"" HTML(text) "\">" \
+               "<figcaption>" inline(title) "</figcaption>" \
+             "</figure>\n\n" \
+             _block( substr( block, len + 1) );
+    } else if ( attrib ) {
+      return "<figure data-src=\"" URL(href) "\" class=\"" HTML(attrib) "\">" \
+               "<img src=\"" URL(href) "\" alt=\"" HTML(text) "\" class=\"" HTML(attrib) "\">" \
+             "</figure>\n\n" \
+             _block( substr( block, len + 1) );
+    } else {
+      return "<figure data-src=\"" URL(href) "\">" \
+               "<img src=\"" URL(href) "\" alt=\"" HTML(text) "\">" \
+             "</figure>\n\n" \
+             _block( substr( block, len + 1) );
+    }
+
+  # reference style images (block)
+  } else if ( match(line, /^!\[([^]]+)\] ?\[([^]]*)\](\n|$)/ ) ) {
+    len = RLENGTH;
+    text = gensub(/^!\[([^\n]+)\] ?\[([^\n]*)\](\n.*)?$/, "\\1", 1, block);
+      id = gensub(/^!\[([^\n]+)\] ?\[([^\n]*)\](\n.*)?$/, "\\2", 1, block);
+    if ( ! id ) id = text;
+    if ( rl_href[id] && rl_title[id] ) {
+      return "<figure data-src=\"" URL(rl_href[id]) "\">" \
+               "<img src=\"" URL(rl_href[id]) "\" alt=\"" HTML(text) "\">" \
+               "<figcaption>" inline(rl_title[id]) "</figcaption>" \
+             "</figure>\n\n" \
+             _block( substr( block, len + 1) );
+    } else if ( rl_href[id] ) {
+      return "<figure data-src=\"" URL(rl_href[id]) "\">" \
+               "<img src=\"" URL(rl_href[id]) "\" alt=\"" HTML(text) "\">" \
+             "</figure>\n\n" \
+             _block( substr( block, len + 1) );
+    } else {
+      return "<p>" HTML(substr(block, 1, len)) "</p>\n" _block( substr(block, len + 1) );
+    }
+
   # Split paragraphs
   } else if ( match( block, /(^|\n)[[:space:]]*(\n|$)/) ) {
     len = RLENGTH; st = RSTART;