servo: Merge #19972 - replaced content_type from DOCString to Mime (from paavininanda:Issue16483); r=jdm

Replaced content_type from DomString to Mime

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #16483 (https://github.com/servo/servo/issues/16483).

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- [x] These changes do not require tests because they make changes to already existing files

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Source-Repo: https://github.com/servo/servo
Source-Revision: 7e501f50f7ef71c6f877bb2ebbaaeaf0162b5f43

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 1561b203307f82f8731f63c95f91587181a3ef15

servo/components/script/dom/document.rs

@@ -98,6 +98,7 @@ use ipc_channel::ipc::{self, IpcSender};
 use js::jsapi::{JSContext, JSObject, JSRuntime};
 use js::jsapi::JS_GetRuntime;
 use metrics::{InteractiveFlag, InteractiveMetrics, InteractiveWindow, ProfilerMetadataFactory, ProgressiveWebMetric};
+use mime::{Mime, TopLevel, SubLevel};
 use msg::constellation_msg::{BrowsingContextId, Key, KeyModifiers, KeyState, TopLevelBrowsingContextId};
 use net_traits::{FetchResponseMsg, IpcSend, ReferrerPolicy};
 use net_traits::CookieSource::NonHTTP;
@@ -235,7 +236,8 @@ pub struct Document {
     node: Node,
     window: Dom<Window>,
     implementation: MutNullableDom<DOMImplementation>,
-    content_type: DOMString,
+    #[ignore_malloc_size_of = "type from external crate"]
+    content_type: Mime,
     last_modified: Option<String>,
     encoding: Cell<&'static Encoding>,
     has_browsing_context: bool,
@@ -2195,7 +2197,7 @@ impl Document {
                          url: Option<ServoUrl>,
                          origin: MutableOrigin,
                          is_html_document: IsHTMLDocument,
-                         content_type: Option<DOMString>,
+                         content_type: Option<Mime>,
                          last_modified: Option<String>,
                          activity: DocumentActivity,
                          source: DocumentSource,
@@ -2220,12 +2222,12 @@ impl Document {
             has_browsing_context: has_browsing_context == HasBrowsingContext::Yes,
             implementation: Default::default(),
             content_type: match content_type {
-                Some(string) => string,
-                None => DOMString::from(match is_html_document {
+                Some(mime_data) => mime_data,
+                None => Mime::from(match is_html_document {
                     // https://dom.spec.whatwg.org/#dom-domimplementation-createhtmldocument
-                    IsHTMLDocument::HTMLDocument => "text/html",
+                    IsHTMLDocument::HTMLDocument => Mime(TopLevel::Text, SubLevel::Html, vec![]),
                     // https://dom.spec.whatwg.org/#concept-document-content-type
-                    IsHTMLDocument::NonHTMLDocument => "application/xml",
+                    IsHTMLDocument::NonHTMLDocument => Mime(TopLevel::Application, SubLevel::Xml, vec![]),
                 }),
             },
             last_modified: last_modified,
@@ -2337,7 +2339,7 @@ impl Document {
                url: Option<ServoUrl>,
                origin: MutableOrigin,
                doctype: IsHTMLDocument,
-               content_type: Option<DOMString>,
+               content_type: Option<Mime>,
                last_modified: Option<String>,
                activity: DocumentActivity,
                source: DocumentSource,
@@ -2887,7 +2889,7 @@ impl DocumentMethods for Document {
 
     // https://dom.spec.whatwg.org/#dom-document-content_type
     fn ContentType(&self) -> DOMString {
-        self.content_type.clone()
+        DOMString::from(self.content_type.to_string())
     }
 
     // https://dom.spec.whatwg.org/#dom-document-doctype
@@ -2967,7 +2969,8 @@ impl DocumentMethods for Document {
             local_name.make_ascii_lowercase();
         }
 
-        let ns = if self.is_html_document || self.content_type == "application/xhtml+xml" {
+        let is_xhtml = self.content_type.0 == TopLevel::Application && self.content_type.1.as_str() == "xhtml+xml";
+        let ns = if self.is_html_document || is_xhtml {
             ns!(html)
         } else {
             ns!()

servo/components/script/dom/domimplementation.rs

@@ -24,6 +24,7 @@ use dom::node::Node;
 use dom::text::Text;
 use dom::xmldocument::XMLDocument;
 use dom_struct::dom_struct;
+use mime::{Mime, TopLevel, SubLevel};
 use script_traits::DocumentActivity;
 
 // https://dom.spec.whatwg.org/#domimplementation
@@ -72,9 +73,9 @@ impl DOMImplementationMethods for DOMImplementation {
         let namespace = namespace_from_domstring(maybe_namespace.to_owned());
 
         let content_type = match namespace {
-            ns!(html) => "application/xhtml+xml",
-            ns!(svg) => "image/svg+xml",
-            _ => "application/xml"
+            ns!(html) => Mime(TopLevel::Application, SubLevel::Ext("xhtml+xml".to_string()), vec![]),
+            ns!(svg) => Mime(TopLevel::Image, SubLevel::Ext("svg+xml".to_string()), vec![]),
+            _ => Mime(TopLevel::Application, SubLevel::Xml, vec![])
         };
 
         // Step 1.
@@ -83,7 +84,7 @@ impl DOMImplementationMethods for DOMImplementation {
                                    None,
                                    self.document.origin().clone(),
                                    IsHTMLDocument::NonHTMLDocument,
-                                   Some(DOMString::from(content_type)),
+                                   Some(content_type),
                                    None,
                                    DocumentActivity::Inactive,
                                    DocumentSource::NotFromParser,

servo/components/script/dom/domparser.rs

@@ -54,7 +54,7 @@ impl DOMParserMethods for DOMParser {
                        ty: DOMParserBinding::SupportedType)
                        -> Fallible<DomRoot<Document>> {
         let url = self.window.get_url();
-        let content_type = DOMString::from(ty.as_str());
+        let content_type = ty.as_str().parse().expect("Supported type is not a MIME type");
         let doc = self.window.Document();
         let loader = DocumentLoader::new(&*doc.loader());
         match ty {

servo/components/script/dom/xmldocument.rs

@@ -16,6 +16,7 @@ use dom::window::Window;
 use dom_struct::dom_struct;
 use js::jsapi::JSContext;
 use js::jsapi::JSObject;
+use mime::Mime;
 use script_traits::DocumentActivity;
 use servo_url::{MutableOrigin, ServoUrl};
 use std::ptr::NonNull;
@@ -32,7 +33,7 @@ impl XMLDocument {
                      url: Option<ServoUrl>,
                      origin: MutableOrigin,
                      is_html_document: IsHTMLDocument,
-                     content_type: Option<DOMString>,
+                     content_type: Option<Mime>,
                      last_modified: Option<String>,
                      activity: DocumentActivity,
                      source: DocumentSource,
@@ -59,7 +60,7 @@ impl XMLDocument {
                url: Option<ServoUrl>,
                origin: MutableOrigin,
                doctype: IsHTMLDocument,
-               content_type: Option<DOMString>,
+               content_type: Option<Mime>,
                last_modified: Option<String>,
                activity: DocumentActivity,
                source: DocumentSource,

servo/components/script/dom/xmlhttprequest.rs

@@ -1271,10 +1271,7 @@ impl XMLHttpRequest {
             Ok(parsed) => Some(parsed),
             Err(_) => None // Step 7
         };
-        let mime_type = self.final_mime_type();
-        let content_type = mime_type.map(|mime|{
-            DOMString::from(format!("{}", mime))
-        });
+        let content_type = self.final_mime_type();
         Document::new(win,
                       HasBrowsingContext::No,
                       parsed_url,

servo/components/script/script_thread.rs

@@ -2183,7 +2183,7 @@ impl ScriptThread {
 
         let content_type = metadata.content_type
                                    .as_ref()
-                                   .map(|&Serde(ContentType(ref mimetype))| DOMString::from(mimetype.to_string()));
+                                   .map(|&Serde(ContentType(ref mimetype))| mimetype.clone());
 
         let loader = DocumentLoader::new_with_threads(self.resource_threads.clone(),
                                                       Some(final_url.clone()));