formulaa 0.1.0

WYSIWYG TUI math editor rendering Unicode/ASCII-art formulas
Documentation 
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//! The matrix environments, in one table: the `\pmatrix`-family
//! minibuffer commands, the LaTeX `\begin{env}` names, and the
//! delimiter pair each wraps. The editor and both LaTeX directions
//! read this, so a new environment is added once.

use super::{ColDelim, Delim};

/// How a grid command wraps its lattice: a delimiter pair, the ‖ ‖
/// norm (\Vmatrix), or nothing (bare \array).
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum GridWrap {
    Bare,
    Pair(Delim, Delim),
    Norm,
}

/// `matrix` and `array` are the bare lattice — a delimited grid spells
/// its pair with `\pmatrix` and friends. `cases`/`rcases` are
/// two-column environments; a wider grid falls back to the general
/// `\left\{ \begin{matrix} … \right.` shell.
pub static GRID_ENVS: phf::Map<&'static str, GridWrap> = phf::phf_map! {
    "matrix" | "array" | "smallmatrix" => GridWrap::Bare,
    "pmatrix" => GridWrap::Pair(Delim::Col(ColDelim::Paren), Delim::Col(ColDelim::Paren)),
    "bmatrix" => GridWrap::Pair(Delim::Col(ColDelim::Bracket), Delim::Col(ColDelim::Bracket)),
    "Bmatrix" => GridWrap::Pair(Delim::Col(ColDelim::Brace), Delim::Col(ColDelim::Brace)),
    "vmatrix" => GridWrap::Pair(Delim::Col(ColDelim::Bar), Delim::Col(ColDelim::Bar)),
    "Vmatrix" => GridWrap::Norm,
    "cases" => GridWrap::Pair(Delim::Col(ColDelim::Brace), Delim::Col(ColDelim::Null)),
    "rcases" => GridWrap::Pair(Delim::Col(ColDelim::Null), Delim::Col(ColDelim::Brace)),
};