Split out four new crates (#5302)

1 files changed, 41 insertions, 0 deletions

diff --git a/crates/typst-library/src/model/emph.rs b/crates/typst-library/src/model/emph.rs
new file mode 100644
index 00000000..e36e5ef7
--- /dev/null
+++ b/crates/typst-library/src/model/emph.rs
@@ -0,0 +1,41 @@
+use crate::diag::SourceResult;
+use crate::engine::Engine;
+use crate::foundations::{elem, Content, Packed, Show, StyleChain};
+use crate::text::{ItalicToggle, TextElem};
+
+/// Emphasizes content by toggling italics.
+///
+/// - If the current [text style]($text.style) is `{"normal"}`, this turns it
+///   into `{"italic"}`.
+/// - If it is already `{"italic"}` or `{"oblique"}`, it turns it back to
+///   `{"normal"}`.
+///
+/// # Example
+/// ```example
+/// This is _emphasized._ \
+/// This is #emph[too.]
+///
+/// #show emph: it => {
+///   text(blue, it.body)
+/// }
+///
+/// This is _emphasized_ differently.
+/// ```
+///
+/// # Syntax
+/// This function also has dedicated syntax: To emphasize content, simply
+/// enclose it in underscores (`_`). Note that this only works at word
+/// boundaries. To emphasize part of a word, you have to use the function.
+#[elem(title = "Emphasis", keywords = ["italic"], Show)]
+pub struct EmphElem {
+    /// The content to emphasize.
+    #[required]
+    pub body: Content,
+}
+
+impl Show for Packed<EmphElem> {
+    #[typst_macros::time(name = "emph", span = self.span())]
+    fn show(&self, _: &mut Engine, _: StyleChain) -> SourceResult<Content> {
+        Ok(self.body().clone().styled(TextElem::set_emph(ItalicToggle(true))))
+    }
+}