Split out four new crates (#5302)

1 files changed, 62 insertions, 0 deletions

diff --git a/crates/typst-library/src/loading/cbor.rs b/crates/typst-library/src/loading/cbor.rs
new file mode 100644
index 00000000..977059c3
--- /dev/null
+++ b/crates/typst-library/src/loading/cbor.rs
@@ -0,0 +1,62 @@
+use ecow::{eco_format, EcoString};
+use typst_syntax::Spanned;
+
+use crate::diag::{At, SourceResult};
+use crate::engine::Engine;
+use crate::foundations::{func, scope, Bytes, Value};
+use crate::World;
+
+/// Reads structured data from a CBOR file.
+///
+/// The file must contain a valid CBOR serialization. Mappings will be
+/// converted into Typst dictionaries, and sequences will be converted into
+/// Typst arrays. Strings and booleans will be converted into the Typst
+/// equivalents, null-values (`null`, `~` or empty ``) will be converted into
+/// `{none}`, and numbers will be converted to floats or integers depending on
+/// whether they are whole numbers.
+///
+/// Be aware that integers larger than 2<sup>63</sup>-1 will be converted to
+/// floating point numbers, which may result in an approximative value.
+#[func(scope, title = "CBOR")]
+pub fn cbor(
+    /// The engine.
+    engine: &mut Engine,
+    /// Path to a CBOR file.
+    ///
+    /// For more details, see the [Paths section]($syntax/#paths).
+    path: Spanned<EcoString>,
+) -> SourceResult<Value> {
+    let Spanned { v: path, span } = path;
+    let id = span.resolve_path(&path).at(span)?;
+    let data = engine.world.file(id).at(span)?;
+    cbor::decode(Spanned::new(data, span))
+}
+
+#[scope]
+impl cbor {
+    /// Reads structured data from CBOR bytes.
+    #[func(title = "Decode CBOR")]
+    pub fn decode(
+        /// cbor data.
+        data: Spanned<Bytes>,
+    ) -> SourceResult<Value> {
+        let Spanned { v: data, span } = data;
+        ciborium::from_reader(data.as_slice())
+            .map_err(|err| eco_format!("failed to parse CBOR ({err})"))
+            .at(span)
+    }
+
+    /// Encode structured data into CBOR bytes.
+    #[func(title = "Encode CBOR")]
+    pub fn encode(
+        /// Value to be encoded.
+        value: Spanned<Value>,
+    ) -> SourceResult<Bytes> {
+        let Spanned { v: value, span } = value;
+        let mut res = Vec::new();
+        ciborium::into_writer(&value, &mut res)
+            .map(|_| res.into())
+            .map_err(|err| eco_format!("failed to encode value as CBOR ({err})"))
+            .at(span)
+    }
+}