Module subscript 

Parsing for subscript (text)

This is a Pandoc extension. Syntax: text produces subscript text.

Rules:

• Must have exactly 1 tilde on each side
• Content cannot be empty
• Tildes cannot have whitespace immediately inside
• Must not be confused with ~~ (strikeout)

Functions

emit_subscript

Emit a subscript node with its content

try_parse_subscript

Try to parse subscript (text) Returns: (total_len, inner_content)