Handle URL without scheme (#30148)

* cleanup and move user input logix into servoshell

* fix fmt

* add more tests

* rename sanitize_url and add location bar test for unix system

* fmt and missing rename

* check for host, fix test-error

* remove println, add condtion for not-none

* fmt

* clean up

* review update

* fix build failure cause by embedder_traits::resources

* add cfg target-os windows

* fmt

* use to_file_path() instead of path()

ports/servoshell/parser.rs

@@ -2,8 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use std::env;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 use log::warn;
 use servo::net_traits::pub_domains::is_reg_domain;
@@ -21,35 +20,57 @@ pub fn parse_url_or_filename(cwd: &Path, input: &str) -> Result<ServoUrl, ()> {
     }
 }
 
-pub fn get_default_url(url_opt: Option<String>) -> ServoUrl {
+pub fn get_default_url(
+    url_opt: Option<&str>,
+    cwd: impl AsRef<Path>,
+    exists: impl FnOnce(&PathBuf) -> bool,
+) -> ServoUrl {
     // If the url is not provided, we fallback to the homepage in prefs,
     // or a blank page in case the homepage is not set either.
-    let cwd = env::current_dir().unwrap();
+    let mut new_url = None;
+    let cmdline_url = url_opt
+        .clone()
+        .map(|s| s.to_string())
+        .and_then(|url_string| {
+            parse_url_or_filename(cwd.as_ref(), &url_string)
+                .map_err(|error| {
+                    warn!("URL parsing failed ({:?}).", error);
+                    error
+                })
+                .ok()
+        });
 
-    let cmdline_url = url_opt.map(|s| s.to_string()).and_then(|url_string| {
-        parse_url_or_filename(&cwd, &url_string)
-            .map_err(|error| {
-                warn!("URL parsing failed ({:?}).", error);
-                error
-            })
-            .ok()
-    });
+    if let Some(url) = cmdline_url.clone() {
+        // Check if the URL path corresponds to a file
+        match (url.scheme(), url.host(), url.to_file_path()) {
+            ("file", None, Ok(ref path)) if exists(path) => {
+                new_url = cmdline_url;
+            },
+            _ => {},
+        }
+    }
+
+    if new_url.is_none() && !url_opt.is_none() {
+        new_url = location_bar_input_to_url(url_opt.unwrap());
+    }
 
     let pref_url = {
         let homepage_url = pref!(shell.homepage);
-        parse_url_or_filename(&cwd, &homepage_url).ok()
+        parse_url_or_filename(cwd.as_ref(), &homepage_url).ok()
     };
     let blank_url = ServoUrl::parse("about:blank").ok();
 
-    cmdline_url.or(pref_url).or(blank_url).unwrap()
+    new_url.or(pref_url).or(blank_url).unwrap()
 }
 
-pub fn sanitize_url(request: &str) -> Option<ServoUrl> {
+pub fn location_bar_input_to_url(request: &str) -> Option<ServoUrl> {
     let request = request.trim();
     ServoUrl::parse(request)
         .ok()
         .or_else(|| {
-            if request.contains('/') || is_reg_domain(request) {
+            if request.starts_with('/') {
+                ServoUrl::parse(&format!("file://{}", request)).ok()
+            } else if request.contains('/') || is_reg_domain(request) {
                 ServoUrl::parse(&format!("https://{}", request)).ok()
             } else {
                 None