Modularized the transpiler

crates/mist-api/src/transpiler.mist

@@ -184,7 +184,9 @@ fn is_source_newer(source *Path, output *Path) std::io::Result<bool> {
     Ok(source_time > output_time)
 }
 
-fn transpile_file(path *PathBuf, source *str, mut output_file PathBuf, mod_decl *str, curr_mod_decl *Option<[mist_parser::ast::Visibility, mist_parser::ast::Identifier]>) {
+pub fn transpile_code<'a>(path *PathBuf, source *'a str, mut output_file PathBuf, mod_decl *str, curr_mod_decl *Option<[mist_parser::ast::Visibility, mist_parser::ast::Identifier]>)
+        Result<[PathBuf, mist_codegen::RustCodegen, String], error::ParseError<'a, Vec<mist_parser::ast::TopLevel>>> {
+
     if let Some[[_, name]] = &curr_mod_decl {
         if output_file.file_name().map(fn(v) -> v.to_str()).unwrap_or_default() != Some("mod.rs") {
             if let Some[ext] = output_file.extension().map(fn(e) -> e.to_owned()) {
@@ -202,8 +204,18 @@ fn transpile_file(path *PathBuf, source *str, mut output_file PathBuf, mod_decl
 
     let mut gc = mist_codegen::RustCodegen::new(path.clone());
 
-    let parsed = match mist_parser::parse(source) {
-        Ok[ast] => ast;
+    let parsed = mist_parser::parse(source)?;
+
+    let output = gc.generate(parsed);
+
+    gc.mapping.shift_rust(mod_decl.lines().count() as isize, 0);
+
+    Ok((output_file, gc, output))
+}
+
+pub fn transpile_file(path *PathBuf, source *str, output_file PathBuf, mod_decl *str, curr_mod_decl *Option<[mist_parser::ast::Visibility, mist_parser::ast::Identifier]>) {
+    let [output_file, gc, output] = match transpile_code(path, source, output_file, mod_decl, curr_mod_decl) {
+        Ok[output] => output;
         Err[e] => {
             match e {
                 error::ParseError::Ast[e] => {
@@ -234,12 +246,8 @@ fn transpile_file(path *PathBuf, source *str, mut output_file PathBuf, mod_decl
         }
     };
 
-    let output = gc.generate(parsed);
-
     let res = fs::write(&output_file, format!("{mod_decl}{output}"));
 
-    gc.mapping.shift_rust(mod_decl.lines().count() as isize, 0);
-
     let output_file_map = output_file.with_extension("map.json");
 
     let res_map = fs::write(&output_file_map, serde_json::to_string(&gc.mapping).unwrap());
@@ -264,4 +272,3 @@ fn transpile_file(path *PathBuf, source *str, mut output_file PathBuf, mod_decl
         process::exit(1);
     }
 }
-