From a8d326b4311757b2b69bc251d460f4242d19a29f Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 3 Jan 2019 12:51:56 -0500
Subject: [PATCH] resolve_module: handle "." and ".." referrers (#1454)

---
 src/deno_dir.rs | 56 +++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 52 insertions(+), 4 deletions(-)

diff --git a/src/deno_dir.rs b/src/deno_dir.rs
index 71a0f7a122..3b3a2c3d34 100644
--- a/src/deno_dir.rs
+++ b/src/deno_dir.rs
@@ -376,16 +376,20 @@ impl DenoDir {
     let filename;
 
     let specifier = self.src_file_to_url(specifier);
-    let referrer = self.src_file_to_url(referrer);
+    let mut referrer = self.src_file_to_url(referrer);
 
     debug!(
       "resolve_module specifier {} referrer {}",
       specifier, referrer
     );
 
-    let j: Url = if referrer == "."
-      || is_remote(&specifier)
-      || Path::new(&specifier).is_absolute()
+    if referrer.starts_with(".") {
+      let cwd = std::env::current_dir().unwrap();
+      let referrer_path = cwd.join(referrer);
+      referrer = referrer_path.to_str().unwrap().to_string() + "/";
+    }
+
+    let j: Url = if is_remote(&specifier) || Path::new(&specifier).is_absolute()
     {
       parse_local_or_remote(&specifier)?
     } else if referrer.ends_with('/') {
@@ -1121,6 +1125,50 @@ mod tests {
     assert_eq!(filename, expected_filename);
   }
 
+  #[test]
+  fn test_resolve_module_referrer_dot() {
+    let (_temp_dir, deno_dir) = test_setup();
+
+    let specifier = "tests/001_hello.js";
+
+    let cwd = std::env::current_dir().unwrap();
+    let expected_path = cwd.join(specifier);
+    let expected_module_name = deno_fs::normalize_path(&expected_path);
+    let expected_filename = expected_module_name.clone();
+
+    let (module_name, filename) =
+      deno_dir.resolve_module(specifier, ".").unwrap();
+    assert_eq!(module_name, expected_module_name);
+    assert_eq!(filename, expected_filename);
+
+    let (module_name, filename) =
+      deno_dir.resolve_module(specifier, "./").unwrap();
+    assert_eq!(module_name, expected_module_name);
+    assert_eq!(filename, expected_filename);
+  }
+
+  #[test]
+  fn test_resolve_module_referrer_dotdot() {
+    let (_temp_dir, deno_dir) = test_setup();
+
+    let specifier = "tests/001_hello.js";
+
+    let cwd = std::env::current_dir().unwrap();
+    let expected_path = cwd.join("..").join(specifier);
+    let expected_module_name = deno_fs::normalize_path(&expected_path);
+    let expected_filename = expected_module_name.clone();
+
+    let (module_name, filename) =
+      deno_dir.resolve_module(specifier, "..").unwrap();
+    assert_eq!(module_name, expected_module_name);
+    assert_eq!(filename, expected_filename);
+
+    let (module_name, filename) =
+      deno_dir.resolve_module(specifier, "../").unwrap();
+    assert_eq!(module_name, expected_module_name);
+    assert_eq!(filename, expected_filename);
+  }
+
   #[test]
   fn test_map_file_extension() {
     assert_eq!(