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//! Evaluation state.
use fontdock::{fallback, FallbackTree, FontStretch, FontStyle, FontVariant, FontWeight};
use super::Scope;
use crate::geom::{Insets, Linear, Sides, Size};
use crate::layout::{Dir, GenAlign, LayoutAlign, LayoutSystem};
use crate::length::Length;
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 text state.
pub text: TextState,
/// The page state.
pub page: PageState,
/// The active layouting system.
pub sys: LayoutSystem,
/// The active alignments.
pub align: LayoutAlign,
}
impl Default for State {
fn default() -> Self {
Self {
scope: crate::library::_std(),
text: TextState::default(),
page: PageState::default(),
sys: LayoutSystem::new(Dir::LTR, Dir::TTB),
align: LayoutAlign::new(GenAlign::Start, GenAlign::Start),
}
}
}
/// Defines which fonts to use and how to space text.
#[derive(Debug, Clone, PartialEq)]
pub struct TextState {
/// A tree of font family names and generic class names.
pub fallback: FallbackTree,
/// The selected font variant.
pub variant: FontVariant,
/// 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,
/// The font size.
pub font_size: FontSize,
/// The word spacing (relative to the the font size).
pub word_spacing: Linear,
/// The line spacing (relative to the the font size).
pub line_spacing: Linear,
/// The paragraphs spacing (relative to the the font size).
pub par_spacing: Linear,
}
impl TextState {
/// The absolute font size.
pub fn font_size(&self) -> f64 {
self.font_size.eval()
}
/// The absolute word spacing.
pub fn word_spacing(&self) -> f64 {
self.word_spacing.eval(self.font_size())
}
/// The absolute line spacing.
pub fn line_spacing(&self) -> f64 {
self.line_spacing.eval(self.font_size())
}
/// The absolute paragraph spacing.
pub fn par_spacing(&self) -> f64 {
self.par_spacing.eval(self.font_size())
}
}
impl Default for TextState {
fn default() -> Self {
Self {
fallback: 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",
],
},
variant: FontVariant {
style: FontStyle::Normal,
weight: FontWeight::REGULAR,
stretch: FontStretch::Normal,
},
strong: false,
emph: false,
font_size: FontSize::abs(Length::pt(11.0).as_raw()),
word_spacing: Linear::rel(0.25),
line_spacing: Linear::rel(0.2),
par_spacing: Linear::rel(0.5),
}
}
}
/// The font size, defined by base and scale.
#[derive(Debug, Clone, PartialEq)]
pub struct FontSize {
/// The base font size, updated whenever the font size is set absolutely.
pub base: f64,
/// The scale to apply on the base font size, updated when the font size
/// is set relatively.
pub scale: Linear,
}
impl FontSize {
/// Create a new font size.
pub fn new(base: f64, scale: Linear) -> Self {
Self { base, scale }
}
/// Create a new font size with the given `base` and a scale of `1.0`.
pub fn abs(base: f64) -> Self {
Self::new(base, Linear::rel(1.0))
}
/// Compute the absolute font size.
pub fn eval(&self) -> f64 {
self.scale.eval(self.base)
}
}
/// Defines the size and margins of a page.
#[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 absolute insets.
pub fn insets(&self) -> Insets {
let Size { width, height } = self.size;
let default = self.class.default_margins();
Insets {
x0: -self.margins.left.unwrap_or(default.left).eval(width),
y0: -self.margins.top.unwrap_or(default.top).eval(height),
x1: -self.margins.right.unwrap_or(default.right).eval(width),
y1: -self.margins.bottom.unwrap_or(default.bottom).eval(height),
}
}
}
impl Default for PageState {
fn default() -> Self {
Self::new(PAPER_A4)
}
}
|
