Add parsing func using input content

instead of self.input()

compiler/erg_parser/parse.rs

@@ -195,8 +195,7 @@ impl Runnable for ParserRunner {
     }
 
     fn eval(&mut self, src: Str) -> Result<String, ParserRunnerErrors> {
-        self.cfg.input = Input::Str(src);
+        let ast = self.parse_with_input(src)?;
-        let ast = self.parse()?;
         Ok(format!("{ast}"))
     }
 }
@@ -222,6 +221,15 @@ impl ParserRunner {
         let mut self_ = Self::new(cfg);
         self_.parse()
     }
+
+    fn parse_with_input(&mut self, src: Str) -> Result<AST, ParserRunnerErrors> {
+        let ts = Lexer::new(Input::Str(src))
+            .lex()
+            .map_err(|errs| ParserRunnerErrors::convert(self.input(), errs))?;
+        Parser::new(ts)
+            .parse(Str::ever(self.cfg.module))
+            .map_err(|errs| ParserRunnerErrors::convert(self.input(), errs))
+    }
 }
 
 impl Parser {