class DiscNode

• supers: Node

A disc node, which occurs only in horizontal lists, specifies a “discretionary” line break. If such a break occurs at a node, the text that starts at pre will precede the break, the text that starts at post will follow the break, and text that appears in replace will be ignored.

Example:

assert.node_type("disc", nil, {
  id = "disc (7)",
  subtypes = {
    "discretionary (0)",
    "explicit (1)",
    "automatic (2)",
    "regular (3)",
    "first (4)",
    "second (5)",
  },
  fields = {
    "prev (-1)",
    "next (0)",
    "id (1)",
    "subtype (2)",
    "attr (3)",
    "pre (4)",
    "post (5)",
    "replace (6)",
    "penalty (7)",
  },
})

Reference:

• Corresponding C source code: texnodes.c#L758-L763
• Donald Ervin Knuth. “TeX: The Program”: section 145, page 53 tex.pdf

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---

fields

---

DiscNode.subtype

---

DiscNode.subtype : DiscNodeSubtype

DiscNode.attr

---

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

A list of attributes.

DiscNode.pre

---

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

A pointer to the pre-break text.

DiscNode.post

---

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

A pointer to the post-break text.

DiscNode.replace

---

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

A pointer to the no-break text.

DiscNode.penalty

---

DiscNode.penalty : integer

The penalty associated with the break, normally hyphenpenalty or exhyphenpenalty.