class NoadNode

supers: Node

First, there are the objects (the TeX book calls them “atoms”) that are associated with the simple math objects: ord, op, bin, rel, open, close, punct, inner, over, under, vcent. These all have the same fields, and they are combined into a single node type with separate subtypes for differentiation.

Some noads have an option field. The values in this bitset are common:

meaning	bits
set	`0x08`
internal	`0x00` + `0x08`
internal	`0x01` + `0x08`
axis	`0x02` + `0x08`
no axis	`0x04` + `0x08`
exact	`0x10` + `0x08`
left	`0x11` + `0x08`
middle	`0x12` + `0x08`
right	`0x14` + `0x08`
no sub script	`0x21` + `0x08`
no super script	`0x22` + `0x08`
no script	`0x23` + `0x08`

Example:

assert.node_type("noad", nil, {
  id = "noad (18)",
  subtypes = {
    "ord (0)",
    "opdisplaylimits (1)",
    "oplimits (2)",
    "opnolimits (3)",
    "bin (4)",
    "rel (5)",
    "open (6)",
    "close (7)",
    "punct (8)",
    "inner (9)",
    "under (10)",
    "over (11)",
    "vcenter (12)",
  },
  fields = {
    "prev (-1)",
    "next (0)",
    "id (1)",
    "subtype (2)",
    "attr (3)",
    "nucleus (4)",
    "sub (5)",
    "sup (6)",
  },
})

Reference:

Corresponding C source code: texnodes.c#L892-L896

😱 Types incomplete or incorrect? 🙏 Please contribute!

fields

NoadNode.subtype

NoadNode.subtype : NoadNodeSubtype

NoadNode.attr

NoadNode.attr : Node {
    next: Node?,
    prev: Node?,
    id: integer,
    subtype: integer,
    head: Node?,
    attr: Node,
}

A list of attributes.

NoadNode.nucleus

NoadNode.nucleus : Node {
    next: Node?,
    prev: Node?,
    id: integer,
    subtype: integer,
    head: Node?,
    attr: Node,
}

base

NoadNode.sub

NoadNode.sub : Node {
    next: Node?,
    prev: Node?,
    id: integer,
    subtype: integer,
    head: Node?,
    attr: Node,
}

subscript

NoadNode.sup

NoadNode.sup : Node {
    next: Node?,
    prev: Node?,
    id: integer,
    subtype: integer,
    head: Node?,
    attr: Node,
}

superscript

NoadNode.options

NoadNode.options : integer

bitset of rendering options