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use typst_syntax::Span;
use crate::foundations::{
cast, elem, Content, Depth, Label, NativeElement, Packed, ShowSet, Smart, StyleChain,
Styles,
};
use crate::introspection::Locatable;
use crate::layout::{BlockElem, Em, PadElem};
use crate::model::{CitationForm, CiteElem};
use crate::text::{SmartQuotes, SpaceElem, TextElem};
/// Displays a quote alongside an optional attribution.
///
/// # Example
/// ```example
/// Plato is often misquoted as the author of #quote[I know that I know
/// nothing], however, this is a derivation form his original quote:
///
/// #set quote(block: true)
///
/// #quote(attribution: [Plato])[
/// ... ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι
/// ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι.
/// ]
/// #quote(attribution: [from the Henry Cary literal translation of 1897])[
/// ... I seem, then, in just this little thing to be wiser than this man at
/// any rate, that what I do not know I do not think I know either.
/// ]
/// ```
///
/// By default block quotes are padded left and right by `{1em}`, alignment and
/// padding can be controlled with show rules:
/// ```example
/// #set quote(block: true)
/// #show quote: set align(center)
/// #show quote: set pad(x: 5em)
///
/// #quote[
/// You cannot pass... I am a servant of the Secret Fire, wielder of the
/// flame of Anor. You cannot pass. The dark fire will not avail you,
/// flame of Udûn. Go back to the Shadow! You cannot pass.
/// ]
/// ```
#[elem(Locatable, ShowSet)]
pub struct QuoteElem {
/// Whether this is a block quote.
///
/// ```example
/// An inline citation would look like
/// this: #quote(
/// attribution: [René Descartes]
/// )[
/// cogito, ergo sum
/// ], and a block equation like this:
/// #quote(
/// block: true,
/// attribution: [JFK]
/// )[
/// Ich bin ein Berliner.
/// ]
/// ```
pub block: bool,
/// Whether double quotes should be added around this quote.
///
/// The double quotes used are inferred from the `quotes` property on
/// [smartquote], which is affected by the `lang` property on [text].
///
/// - `{true}`: Wrap this quote in double quotes.
/// - `{false}`: Do not wrap this quote in double quotes.
/// - `{auto}`: Infer whether to wrap this quote in double quotes based on
/// the `block` property. If `block` is `{false}`, double quotes are
/// automatically added.
///
/// ```example
/// #set text(lang: "de")
///
/// Ein deutsch-sprechender Author
/// zitiert unter umständen JFK:
/// #quote[Ich bin ein Berliner.]
///
/// #set text(lang: "en")
///
/// And an english speaking one may
/// translate the quote:
/// #quote[I am a Berliner.]
/// ```
pub quotes: Smart<bool>,
/// The attribution of this quote, usually the author or source. Can be a
/// label pointing to a bibliography entry or any content. By default only
/// displayed for block quotes, but can be changed using a `{show}` rule.
///
/// ```example
/// #quote(attribution: [René Descartes])[
/// cogito, ergo sum
/// ]
///
/// #show quote.where(block: false): it => {
/// ["] + h(0pt, weak: true) + it.body + h(0pt, weak: true) + ["]
/// if it.attribution != none [ (#it.attribution)]
/// }
///
/// #quote(
/// attribution: link("https://typst.app/home")[typst.app]
/// )[
/// Compose papers faster
/// ]
///
/// #set quote(block: true)
///
/// #quote(attribution: <tolkien54>)[
/// You cannot pass... I am a servant
/// of the Secret Fire, wielder of the
/// flame of Anor. You cannot pass. The
/// dark fire will not avail you, flame
/// of Udûn. Go back to the Shadow! You
/// cannot pass.
/// ]
///
/// #bibliography("works.bib", style: "apa")
/// ```
pub attribution: Option<Attribution>,
/// The quote.
#[required]
pub body: Content,
/// The nesting depth.
#[internal]
#[fold]
#[ghost]
pub depth: Depth,
}
impl QuoteElem {
/// Quotes the body content with the appropriate quotes based on the current
/// styles and surroundings.
pub fn quoted(body: Content, styles: StyleChain<'_>) -> Content {
let quotes = SmartQuotes::get_in(styles);
// Alternate between single and double quotes.
let Depth(depth) = styles.get(QuoteElem::depth);
let double = depth % 2 == 0;
Content::sequence([
TextElem::packed(quotes.open(double)),
body,
TextElem::packed(quotes.close(double)),
])
.set(QuoteElem::depth, Depth(1))
}
}
/// Attribution for a [quote](QuoteElem).
#[derive(Debug, Clone, PartialEq, Hash)]
pub enum Attribution {
Content(Content),
Label(Label),
}
impl Attribution {
/// Realize as an em dash followed by text or a citation.
pub fn realize(&self, span: Span) -> Content {
Content::sequence([
TextElem::packed('—'),
SpaceElem::shared().clone(),
match self {
Attribution::Content(content) => content.clone(),
Attribution::Label(label) => CiteElem::new(*label)
.with_form(Some(CitationForm::Prose))
.pack()
.spanned(span),
},
])
}
}
cast! {
Attribution,
self => match self {
Self::Content(content) => content.into_value(),
Self::Label(label) => label.into_value(),
},
content: Content => Self::Content(content),
label: Label => Self::Label(label),
}
impl ShowSet for Packed<QuoteElem> {
fn show_set(&self, styles: StyleChain) -> Styles {
let mut out = Styles::new();
if self.block.get(styles) {
out.set(PadElem::left, Em::new(1.0).into());
out.set(PadElem::right, Em::new(1.0).into());
out.set(BlockElem::above, Smart::Custom(Em::new(2.4).into()));
out.set(BlockElem::below, Smart::Custom(Em::new(1.8).into()));
}
out
}
}
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