Pass ParserContext down to lengths

To make it possible to check the rule type when parsing lengths, we need to pass
the `ParserContext` down through many layers to the place where length units are
parsed.

This change leaves it unused, so it's only to prepare for the next change.

MozReview-Commit-ID: 70YwtcCxnWw

1 files changed, 8 insertions, 4 deletions

diff --git a/components/script/dom/htmlstyleelement.rs b/components/script/dom/htmlstyleelement.rs
index c3ef5767f2b..fa0cdc92eab 100644
--- a/components/script/dom/htmlstyleelement.rs
+++ b/components/script/dom/htmlstyleelement.rs
@@ -25,7 +25,8 @@ use script_layout_interface::message::Msg;
 use std::cell::Cell;
 use std::sync::Arc;
 use style::media_queries::parse_media_query_list;
-use style::stylesheets::{Stylesheet, Origin};
+use style::parser::ParserContext as CssParserContext;
+use style::stylesheets::{CssRuleType, Stylesheet, Origin};
 use stylesheet_loader::{StylesheetLoader, StylesheetOwner};
 
 #[dom_struct]
@@ -73,7 +74,6 @@ impl HTMLStyleElement {
         assert!(node.is_in_doc());
 
         let win = window_from_node(node);
-        let url = win.get_url();
 
         let mq_attribute = element.get_attribute(&ns!(), &local_name!("media"));
         let mq_str = match mq_attribute {
@@ -82,10 +82,14 @@ impl HTMLStyleElement {
         };
 
         let data = node.GetTextContent().expect("Element.textContent must be a string");
-        let mq = parse_media_query_list(&mut CssParser::new(&mq_str));
+        let url = win.get_url();
+        let context = CssParserContext::new_for_cssom(&url,
+                                                      win.css_error_reporter(),
+                                                      Some(CssRuleType::Media));
+        let mq = parse_media_query_list(&context, &mut CssParser::new(&mq_str));
         let shared_lock = node.owner_doc().style_shared_lock().clone();
         let loader = StylesheetLoader::for_element(self.upcast());
-        let sheet = Stylesheet::from_str(&data, url, Origin::Author, mq,
+        let sheet = Stylesheet::from_str(&data, win.get_url(), Origin::Author, mq,
                                          shared_lock, Some(&loader),
                                          win.css_error_reporter());