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|
use super::*;
const ROW_GAP: Em = Em::new(0.5);
const VERTICAL_PADDING: Ratio = Ratio::new(0.1);
/// # Vector
/// A column vector.
///
/// _Note:_ Matrices are not yet supported.
///
/// ## Example
/// ```
/// $ vec(a, b, c) dot vec(1, 2, 3)
/// = a + 2b + 3c $
/// ```
///
/// ## Parameters
/// - elements: Content (positional, variadic)
/// The elements of the vector.
///
/// ## Category
/// math
#[func]
#[capable(LayoutMath)]
#[derive(Debug, Hash)]
pub struct VecNode(Vec<Content>);
#[node]
impl VecNode {
/// The delimiter to use.
///
/// # Example
/// ```
/// #set math.vec(delim: "[")
/// $ vec(1, 2) $
/// ```
pub const DELIM: Delimiter = Delimiter::Paren;
fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
Ok(Self(args.all()?).pack())
}
fn field(&self, name: &str) -> Option<Value> {
match name {
"elements" => {
Some(Value::Array(self.0.iter().cloned().map(Value::Content).collect()))
}
_ => None,
}
}
}
impl LayoutMath for VecNode {
fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
let delim = ctx.outer.get(Self::DELIM);
layout(ctx, &self.0, Align::Center, Some(delim.open()), Some(delim.close()))
}
}
/// # Cases
/// A case distinction.
///
/// ## Example
/// ```
/// $ f(x, y) := cases(
/// 1 "if" (x dot y)/2 <= 0,
/// 2 "if" x in NN,
/// 3 "if" x "is even",
/// 4 "else",
/// ) $
/// ```
///
/// ## Parameters
/// - branches: Content (positional, variadic)
/// The branches of the case distinction.
///
/// ## Category
/// math
#[func]
#[capable(LayoutMath)]
#[derive(Debug, Hash)]
pub struct CasesNode(Vec<Content>);
#[node]
impl CasesNode {
fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
Ok(Self(args.all()?).pack())
}
fn field(&self, name: &str) -> Option<Value> {
match name {
"branches" => {
Some(Value::Array(self.0.iter().cloned().map(Value::Content).collect()))
}
_ => None,
}
}
}
impl LayoutMath for CasesNode {
fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
layout(ctx, &self.0, Align::Left, Some('{'), None)
}
}
/// A vector / matrix delimiter.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum Delimiter {
Paren,
Bracket,
Brace,
Bar,
DoubleBar,
}
impl Delimiter {
/// The delimiter's opening character.
fn open(self) -> char {
match self {
Self::Paren => '(',
Self::Bracket => '[',
Self::Brace => '{',
Self::Bar => '|',
Self::DoubleBar => '‖',
}
}
/// The delimiter's closing character.
fn close(self) -> char {
match self {
Self::Paren => ')',
Self::Bracket => ']',
Self::Brace => '}',
Self::Bar => '|',
Self::DoubleBar => '‖',
}
}
}
castable! {
Delimiter,
/// Delimit the vector with parentheses.
"(" => Self::Paren,
/// Delimit the vector with brackets.
"[" => Self::Bracket,
/// Delimit the vector with curly braces.
"{" => Self::Brace,
/// Delimit the vector with vertical bars.
"|" => Self::Bar,
/// Delimit the vector with double vertical bars.
"||" => Self::DoubleBar,
}
/// Layout a matrix.
fn layout(
ctx: &mut MathContext,
elements: &[Content],
align: Align,
left: Option<char>,
right: Option<char>,
) -> SourceResult<()> {
let axis = scaled!(ctx, axis_height);
let gap = ROW_GAP.scaled(ctx);
let short_fall = DELIM_SHORT_FALL.scaled(ctx);
ctx.style(ctx.style.for_denominator());
let mut rows = vec![];
for element in elements {
rows.push(ctx.layout_row(element)?);
}
ctx.unstyle();
let mut frame = stack(ctx, rows, align, gap, 0);
let height = frame.height();
let target = height + VERTICAL_PADDING.of(height);
frame.set_baseline(frame.height() / 2.0 + axis);
if let Some(left) = left {
ctx.push(GlyphFragment::new(ctx, left).stretch_vertical(ctx, target, short_fall));
}
ctx.push(frame);
if let Some(right) = right {
ctx.push(
GlyphFragment::new(ctx, right).stretch_vertical(ctx, target, short_fall),
);
}
Ok(())
}
|
