remove comment-like strings from content before importUrls()

this fixes hayd#86 partially.

mod.ts

@@ -59,7 +59,14 @@ export class Udd {
   async run(): Promise<UddResult[]> {
     const content: string = await this.content();
 
-    const urls: string[] = importUrls(content, this.registries);
+    // Remove "comment-like" strings from `content`.
+    //
+    // This is a naive way and not a proper way to remove comments from
+    // JavaScript and TypeScript files, but works well for our purpose.
+    const contentWithoutComments =
+      content.replace(/\/\*([^*]|\*[^\/])*\*\/|(?<=[^:])\/\/.*|^\/\/.*/gm, '');
+
+    const urls: string[] = importUrls(contentWithoutComments, this.registries);
     this.progress.n = urls.length;
 
     // from a url we need to extract the current version

test.ts

@@ -159,3 +159,35 @@ import "https://raw.githubusercontent.com/foo/bar/main/mod.ts#=";
   const results = await testUdd(contents, expected);
   assertEquals(results.length, 0);
 });
+
+Deno.test("uddIgnoreComments", async () => {
+  {
+    const contents = `//import "https://fakeregistry.com/foo@0.0.1/mod.ts";`;
+    const expected = contents;
+    const results = await testUdd(contents, expected);
+    assertEquals(results.length, 0);
+  }
+  {
+    const contents = `/*import "https://fakeregistry.com/foo@0.0.1/mod.ts";*/`;
+    const expected = contents;
+    const results = await testUdd(contents, expected);
+    assertEquals(results.length, 0);
+  }
+  // limitations
+  //
+  // TODO: probably, we should use a js parser and collect and modify import
+  // declarations in the AST.  Then, serialize the modified AST to the source
+  // text.
+  {
+    const contents = `
+//import "https://fakeregistry.com/foo@0.0.1/mod.ts";
+import "https://fakeregistry.com/foo@0.0.1/mod.ts";
+`;
+    const expected = `
+//import "https://fakeregistry.com/foo@0.0.2/mod.ts";
+import "https://fakeregistry.com/foo@0.0.2/mod.ts";
+`;
+    const results = await testUdd(contents, expected);
+    assertEquals(results.length, 1);
+  }
+});