You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: importer.rs
    path of file: ./repos/goscript/types/src
    
    the code of the file until where you have to start completion: // Copyright 2022 The Goscript Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
//
// This code is adapted from the offical Go code written in Go
// with license as follows:
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

use super::check::{Checker, TypeInfo};
use super::objects::{PackageKey, TCObjects};
use go_parser::ast;
use go_parser::{AstObjects, ErrorList, FileSet, Map, Parser, Pos};
use std::io;
use std::path::{Path, PathBuf};

pub struct TraceConfig {
    //print debug info in parser
    pub trace_parser: bool,
    // print debug info in checker
    pub trace_checker: bool,
}

pub trait SourceRead {
    fn working_dir(&self) -> &Path;

    fn base_dir(&self) -> Option<&Path>;

    fn read_file(&self, path: &Path) -> io::Result<String>;

    fn read_dir(&self, path: &Path) -> io::Result<Vec<PathBuf>>;

    fn is_file(&self, path: &Path) -> bool;

    fn is_dir(&self, path: &Path) -> bool;

    fn canonicalize
    
    fn parse_path(&mut self, path: &Path) -> Result<Vec<ast::File>, ()> {
        match read_content(path, self.reader) {
            Ok(contents) => {
                if contents.len() == 0 {
                    self.error(format!("no source file found in dir: {}", path.display()))
                } else {
                    let mut afiles = vec![];
                    for (full_name, content) in contents.into_iter() {
                        let mut pfile = self.fset.add_file(
                            full_name,
                            Some(self.fset.base()),
                            content.chars().count(),
                        );
                        let afile = Parser::new(
                            self.ast_objs,
                            &mut pfile,
                            self.errors,
                            &content,
                            self.trace_config.trace_parser,
                        )
                        .parse_file();
                        if afile.is_none() {
                            // parse error, the details should be in the errorlist already.
                            // give up
                            return Err(());
                        } else {
                            afiles.push(afile.unwrap());
                        }
                    }
                    Ok(afiles)
                }
            }
            Err(e) => self.error(format!(
                "failed to read from path: {}, {}",
                path.display(),
                e
            )),
        }
    }