Module ast 

AST node types produced by the scanner/structurer — port of ast.ts / Ast.java. Pure data; the sealed Block/TableOrFence interfaces become Rust enums (exhaustive match replaces instanceof). Immutability is by construction (owned fields, no mutation) — Java’s List.copyOf defensive copies have no Rust analog.

Structs

Blockquote

A markdown blockquote (>).

Doc

A parsed source file: its matched examples plus unattached table/fence blocks.

Example

One matched example: the heading scope above it (outer→inner) plus its body blocks (first is the candidate primary block, then any trailing attachments).

Fence

A fenced code block; info is the text after the opening fence.

Heading

A markdown heading (#..######); level is 1–6.

ListItem

A single list item (-/* or numbered).

Paragraph

A markdown paragraph.

Row

One row of a table: cells and cell_spans are parallel, same-length.

SegmentOffset

Maps a block-text offset to its source offset (both UTF-16).

Table

A markdown table: a header Row plus zero or more data rows.

ThematicBreak

A thematic break (---/***/___).

Enums

Block

A markdown block node — the closed union the structurer matches over.

TableOrFence

The block kinds that may appear as a Doc orphan attachment (Table | Fence).