feat(typst): escape string in math mode

3 files changed, 22 insertions, 7 deletions

diff --git a/typst/example.c b/typst/example.c
index a1df659..39e7a06 100644
--- a/typst/example.c
+++ b/typst/example.c
@@ -4,6 +4,6 @@
 int main() {
     const char* res = typst_generateSVG("Hello world");
     printf("%s\n", res);
-    typst_freeSVG(res);
+    typst_freeString(res);
     return 0;
 }
diff --git a/typst/src/lib.rs b/typst/src/lib.rs
index c561c19..83a0afb 100644
--- a/typst/src/lib.rs
+++ b/typst/src/lib.rs
@@ -1,5 +1,5 @@
 //! Based on https://github.com/zeon256/minimal-typst-svg-renderer
-use std::ffi::{CString, CStr};
+use std::ffi::{CStr, CString};
 use std::os::raw::c_char;
 
 use typst::layout::PagedDocument;
@@ -23,17 +23,30 @@ pub fn compile(content: &str) -> String {
     svg_frame(&doc.pages[0].frame)
 }
 
-#[unsafe(no_mangle)]
-pub extern "C" fn typst_generateSVG(source: *const c_char) ->  *const c_char {
+pub fn escape_math(content: &str) -> String {
+    content.replace("$", r"\$")
+}
+
+unsafe fn convert_call(source: *const c_char, f: fn(&str) -> String) -> *const c_char {
     unsafe {
-        let res = compile(CStr::from_ptr(source).to_str().unwrap());
+        let res = f(CStr::from_ptr(source).to_str().unwrap());
         CString::new(res).unwrap().into_raw()
     }
 }
 
 #[unsafe(no_mangle)]
-pub extern "C" fn typst_freeSVG(res: *mut c_char) {
+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_espaceMath(source: *const c_char) -> *const c_char {
+    unsafe { convert_call(source, escape_math) }
+}
diff --git a/typst/typst.h b/typst/typst.h
index ca6c21f..755314a 100644
--- a/typst/typst.h
+++ b/typst/typst.h
@@ -1,2 +1,4 @@
 extern const char *typst_generateSVG(const char*);
-extern void typst_freeSVG(const char*);
+extern const char *typst_escapeMath(const char*);
+
+extern void typst_freeString(const char*);