Merge #4940

4940: Add support for marking doctest items as distinct from normal code r=ltentrup a=Nashenas88

This adds `HighlightTag::Generic | HighlightModifier::Injected` as the default highlight for all elements within a doctest. Please feel free to suggest that a new tag be created or a different one used.

![Screenshot from 2020-06-23 09-18-13](https://user-images.githubusercontent.com/1673130/85408493-9752ce00-b532-11ea-94fe-197353ccc778.png)

Fixes #4929 
Fixes #4939

Co-authored-by: Paul Daniel Faria <[email protected]>
Co-authored-by: Paul Daniel Faria <[email protected]>

3 files changed, 13 insertions, 4 deletions

diff --git a/crates/ra_ide/src/syntax_highlighting/html.rs b/crates/ra_ide/src/syntax_highlighting/html.rs
index 99b6b25ab..0c74f7370 100644
--- a/crates/ra_ide/src/syntax_highlighting/html.rs
+++ b/crates/ra_ide/src/syntax_highlighting/html.rs
@@ -64,6 +64,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 
 .lifetime           { color: #DFAF8F; font-style: italic; }
 .comment            { color: #7F9F7F; }
+.documentation      { color: #629755; }
+.injected           { opacity: 0.65 ; }
 .struct, .enum      { color: #7CB8BB; }
 .enum_variant       { color: #BDE0F3; }
 .string_literal     { color: #CC9393; }
diff --git a/crates/ra_ide/src/syntax_highlighting/injection.rs b/crates/ra_ide/src/syntax_highlighting/injection.rs
index 9d82b4009..181c21256 100644
--- a/crates/ra_ide/src/syntax_highlighting/injection.rs
+++ b/crates/ra_ide/src/syntax_highlighting/injection.rs
@@ -8,8 +8,8 @@ use ra_syntax::{ast, AstToken, SyntaxNode, SyntaxToken, TextRange, TextSize};
 use stdx::SepBy;
 
 use crate::{
-    call_info::ActiveParameter, Analysis, HighlightModifier, HighlightTag, HighlightedRange,
-    RootDatabase,
+    call_info::ActiveParameter, Analysis, Highlight, HighlightModifier, HighlightTag,
+    HighlightedRange, RootDatabase,
 };
 
 use super::HighlightedRangeStack;
@@ -172,6 +172,7 @@ pub(super) fn highlight_doc_comment(
                 h.range.end() + end_offset.unwrap_or(start_offset) - h.range.start(),
             );
 
+            h.highlight |= HighlightModifier::Injected;
             stack.add(h);
         }
     }
@@ -181,6 +182,7 @@ pub(super) fn highlight_doc_comment(
     for comment in new_comments {
         stack.add(comment);
     }
-    stack.pop_and_inject(false);
-    stack.pop_and_inject(true);
+    stack.pop_and_inject(None);
+    stack
+        .pop_and_inject(Some(Highlight::from(HighlightTag::Generic) | HighlightModifier::Injected));
 }
diff --git a/crates/ra_ide/src/syntax_highlighting/tags.rs b/crates/ra_ide/src/syntax_highlighting/tags.rs
index 93bbb4b4d..e8e251cfc 100644
--- a/crates/ra_ide/src/syntax_highlighting/tags.rs
+++ b/crates/ra_ide/src/syntax_highlighting/tags.rs
@@ -27,6 +27,7 @@ pub enum HighlightTag {
     Field,
     FormatSpecifier,
     Function,
+    Generic,
     Keyword,
     Lifetime,
     Macro,
@@ -57,6 +58,7 @@ pub enum HighlightModifier {
     /// not.
     Definition,
     Documentation,
+    Injected,
     Mutable,
     Unsafe,
 }
@@ -77,6 +79,7 @@ impl HighlightTag {
             HighlightTag::Field => "field",
             HighlightTag::FormatSpecifier => "format_specifier",
             HighlightTag::Function => "function",
+            HighlightTag::Generic => "generic",
             HighlightTag::Keyword => "keyword",
             HighlightTag::Lifetime => "lifetime",
             HighlightTag::Macro => "macro",
@@ -110,6 +113,7 @@ impl HighlightModifier {
         HighlightModifier::ControlFlow,
         HighlightModifier::Definition,
         HighlightModifier::Documentation,
+        HighlightModifier::Injected,
         HighlightModifier::Mutable,
         HighlightModifier::Unsafe,
     ];
@@ -120,6 +124,7 @@ impl HighlightModifier {
             HighlightModifier::ControlFlow => "control",
             HighlightModifier::Definition => "declaration",
             HighlightModifier::Documentation => "documentation",
+            HighlightModifier::Injected => "injected",
             HighlightModifier::Mutable => "mutable",
             HighlightModifier::Unsafe => "unsafe",
         }