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//! Evaluation state.
use std::rc::Rc;
use fontdock::{fallback, FallbackTree, FontStretch, FontStyle, FontVariant, FontWeight};
use super::Scope;
use crate::geom::{Align, BoxAlign, Dir, Flow, Length, Linear, Relative, Sides, Size};
use crate::paper::{Paper, PaperClass, PAPER_A4};
/// The active evaluation state.
#[derive(Debug, Clone, PartialEq)]
pub struct State {
/// The scope that contains function definitions.
pub scope: Scope,
/// The page state.
pub page: PageState,
/// The paragraph state.
pub par: ParState,
/// The font state.
pub font: FontState,
/// The active layouting directions.
pub flow: Flow,
/// The active box alignments.
pub align: BoxAlign,
}
impl Default for State {
fn default() -> Self {
Self {
scope: crate::library::_std(),
page: PageState::default(),
par: ParState::default(),
font: FontState::default(),
flow: Flow::new(Dir::TTB, Dir::LTR),
align: BoxAlign::new(Align::Start, Align::Start),
}
}
}
/// Defines page properties.
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct PageState {
/// The class of this page.
pub class: PaperClass,
/// The width and height of the page.
pub size: Size,
/// The amount of white space in the order [left, top, right, bottom]. If a
/// side is set to `None`, the default for the paper class is used.
pub margins: Sides<Option<Linear>>,
}
impl PageState {
/// The default page style for the given paper.
pub fn new(paper: Paper) -> Self {
Self {
class: paper.class,
size: paper.size(),
margins: Sides::uniform(None),
}
}
/// The margins.
pub fn margins(&self) -> Sides<Linear> {
let default = self.class.default_margins();
Sides {
left: self.margins.left.unwrap_or(default.left),
top: self.margins.top.unwrap_or(default.top),
right: self.margins.right.unwrap_or(default.right),
bottom: self.margins.bottom.unwrap_or(default.bottom),
}
}
}
impl Default for PageState {
fn default() -> Self {
Self::new(PAPER_A4)
}
}
/// Defines paragraph properties.
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct ParState {
/// The spacing between words (dependent on scaled font size).
pub word_spacing: Linear,
/// The spacing between lines (dependent on scaled font size).
pub line_spacing: Linear,
/// The spacing between paragraphs (dependent on scaled font size).
pub par_spacing: Linear,
}
impl Default for ParState {
fn default() -> Self {
Self {
word_spacing: Relative::new(0.25).into(),
line_spacing: Relative::new(0.2).into(),
par_spacing: Relative::new(0.5).into(),
}
}
}
/// Defines font properties.
#[derive(Debug, Clone, PartialEq)]
pub struct FontState {
/// A tree of font family names and generic class names.
pub families: Rc<FallbackTree>,
/// The selected font variant.
pub variant: FontVariant,
/// The font size.
pub size: Length,
/// The linear to apply on the base font size.
pub scale: Linear,
/// Whether the strong toggle is active or inactive. This determines
/// whether the next `*` adds or removes font weight.
pub strong: bool,
/// Whether the emphasis toggle is active or inactive. This determines
/// whether the next `_` makes italic or non-italic.
pub emph: bool,
}
impl FontState {
/// The absolute font size.
pub fn font_size(&self) -> Length {
self.scale.resolve(self.size)
}
}
impl Default for FontState {
fn default() -> Self {
Self {
families: Rc::new(default_font_families()),
variant: FontVariant {
style: FontStyle::Normal,
weight: FontWeight::REGULAR,
stretch: FontStretch::Normal,
},
size: Length::pt(11.0),
scale: Linear::ONE,
strong: false,
emph: false,
}
}
}
/// The default tree of font fallbacks.
fn default_font_families() -> FallbackTree {
fallback! {
list: ["sans-serif"],
classes: {
"serif" => ["source serif pro", "noto serif"],
"sans-serif" => ["source sans pro", "noto sans"],
"monospace" => ["source code pro", "noto sans mono"],
"math" => ["latin modern math", "serif"],
},
base: [
"source sans pro",
"noto sans",
"segoe ui emoji",
"noto emoji",
"latin modern math",
],
}
}
|
