style(typst): move in lib folder

2 files changed, 140 insertions, 0 deletions

diff --git a/lib/typst/src/lib.rs b/lib/typst/src/lib.rs
new file mode 100644
index 0000000..5c2ee0d
--- /dev/null
+++ b/lib/typst/src/lib.rs
@@ -0,0 +1,52 @@
+//! Based on https://github.com/zeon256/minimal-typst-svg-renderer
+use std::ffi::{CStr, CString};
+use std::os::raw::c_char;
+
+use typst::layout::PagedDocument;
+use typst_svg::svg_frame;
+
+use crate::world::MinimalWorld;
+
+mod world;
+
+pub fn compile(content: &str) -> String {
+    let world = MinimalWorld::new(content);
+
+    let res = typst::compile::<PagedDocument>(&world);
+
+    if !res.warnings.is_empty() {
+        eprintln!("Warnings: {:?}", res.warnings);
+    }
+
+    let doc = res.output.expect("Error compiling typst");
+
+    svg_frame(&doc.pages[0].frame)
+}
+
+pub fn escape_math(content: &str) -> String {
+    content.replace("$", r"\$").replace("\n", r"\ ")
+}
+
+unsafe fn convert_call(source: *const c_char, f: fn(&str) -> String) -> *const c_char {
+    unsafe {
+        let res = f(CStr::from_ptr(source).to_str().unwrap());
+        CString::new(res).unwrap().into_raw()
+    }
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn typst_generateSVG(source: *const c_char) -> *const c_char {
+    unsafe { convert_call(source, compile) }
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn typst_freeString(res: *mut c_char) {
+    unsafe {
+        drop(CString::from_raw(res));
+    }
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn typst_escapeMath(source: *const c_char) -> *const c_char {
+    unsafe { convert_call(source, escape_math) }
+}
diff --git a/lib/typst/src/world.rs b/lib/typst/src/world.rs
new file mode 100644
index 0000000..c2fe7c7
--- /dev/null
+++ b/lib/typst/src/world.rs
@@ -0,0 +1,88 @@
+//! Based on https://github.com/zeon256/minimal-typst-svg-renderer
+
+use std::path::PathBuf;
+
+use typst::Library;
+use typst::LibraryExt;
+use typst::World;
+use typst::diag::{FileError, FileResult};
+use typst::foundations::{Bytes, Datetime};
+use typst::syntax::{FileId, Source};
+use typst::text::{Font, FontBook};
+use typst::utils::LazyHash;
+use typst_kit::fonts::{FontSlot, Fonts};
+
+/// Main interface that determines the environment for Typst.
+pub struct MinimalWorld {
+    /// The content of a source.
+    source: Source,
+
+    /// The standard library.
+    library: LazyHash<Library>,
+
+    /// Metadata about all known fonts.
+    book: LazyHash<FontBook>,
+
+    /// Metadata about all known fonts.
+    fonts: Vec<FontSlot>,
+}
+
+impl MinimalWorld {
+    pub fn new(source: impl Into<String>) -> Self {
+        let mut searcher = Fonts::searcher();
+        searcher.include_system_fonts(true);
+        #[cfg(feature = "embed-fonts")]
+        searcher.include_embedded_fonts(true);
+        let fonts = searcher.search();
+
+        Self {
+            library: LazyHash::new(Library::default()),
+            book: LazyHash::new(fonts.book),
+            fonts: fonts.fonts,
+            source: Source::detached(source),
+        }
+    }
+}
+
+impl World for MinimalWorld {
+    /// Standard library.
+    fn library(&self) -> &LazyHash<Library> {
+        &self.library
+    }
+
+    /// Metadata about all known Books.
+    fn book(&self) -> &LazyHash<FontBook> {
+        &self.book
+    }
+
+    /// Accessing the main source file.
+    fn main(&self) -> FileId {
+        self.source.id()
+    }
+
+    /// Accessing a specified source file (based on `FileId`).
+    fn source(&self, id: FileId) -> FileResult<Source> {
+        if id == self.source.id() {
+            Ok(self.source.clone())
+        } else {
+            Err(FileError::NotFound(PathBuf::new()))
+        }
+    }
+
+    /// Accessing a specified file (non-file).
+    fn file(&self, _id: FileId) -> FileResult<Bytes> {
+        Err(FileError::NotFound(PathBuf::new()))
+    }
+
+    /// Accessing a specified font per index of font book.
+    fn font(&self, id: usize) -> Option<Font> {
+        self.fonts.get(id)?.get()
+    }
+
+    /// Get the current date.
+    ///
+    /// Optionally, an offset in hours is given.
+    fn today(&self, _offset: Option<i64>) -> Option<Datetime> {
+        None
+    }
+}