Module mark 

Parsing for mark/highlight (==text==).

This is a Pandoc non-default extension. Syntax: ==text== produces highlighted text.

Rules (Pandoc parity):

• Must start with exactly two = delimiters
• Content cannot be empty or all whitespace
• Content cannot start or end with whitespace
• Closers are matched greedily at the first valid ==

Functions

emit_mark

Emit a mark node with its content.

try_parse_mark

Try to parse mark/highlight (==text==). Returns: (total_len, inner_content)