Fix YAML slash comments with colons (#1278)

Fixes #1271.

## Summary
- Treat `//` inline comment text as `Comment` in YAML highlighting.
- Keep key matching from running through `//` comment text before a
later colon.
- Add YAML lexer fixture coverage for `//` comments with colon text.

## Tests
- `PATH=/root/sdk/go1.26.2/bin:$PATH go test ./lexers -run
'TestLexers/YAML' -count=1`
- `PATH=/root/sdk/go1.26.2/bin:$PATH go test ./... -count=1`
- `git diff --check`

Co-authored-by: cyphercodes <cyphercodes@users.noreply.github.com>

Author: cyphercodes

lexers/embedded/yaml.xml

@@ -23,6 +23,9 @@
       <rule pattern="#.*$">
         <token type="Comment"/>
       </rule>
+      <rule pattern="//.*$">
+        <token type="Comment"/>
+      </rule>
       <rule pattern="!![^\s]+">
         <token type="CommentPreproc"/>
       </rule>
@@ -78,6 +81,13 @@
           <token type="Comment"/>
         </bygroups>
       </rule>
+      <rule pattern="([^\{\}\[\]\?,\:\!\-\*&amp;\@].*)( )+(//.*)">
+        <bygroups>
+          <token type="Literal"/>
+          <token type="TextWhitespace"/>
+          <token type="Comment"/>
+        </bygroups>
+      </rule>
       <rule pattern="[^\{\}\[\]\?,\:\!\-\*&amp;\@].*">
         <token type="Literal"/>
       </rule>
@@ -86,7 +96,7 @@
       <rule pattern="&#34;[^&#34;\n].*&#34;: ">
         <token type="NameTag"/>
       </rule>
-      <rule pattern="(-)( )([^&#34;\n{]*)(:)( )">
+      <rule pattern="(-)( )((?:(?!//)[^&#34;\n{])*?)(:)( )">
         <bygroups>
           <token type="Punctuation"/>
           <token type="TextWhitespace"/>
@@ -95,14 +105,14 @@
           <token type="TextWhitespace"/>
         </bygroups>
       </rule>
-      <rule pattern="([^&#34;\n{]*)(:)( )">
+      <rule pattern="((?:(?!//)[^&#34;\n{])*?)(:)( )">
         <bygroups>
           <token type="NameTag"/>
           <token type="Punctuation"/>
           <token type="TextWhitespace"/>
         </bygroups>
       </rule>
-      <rule pattern="([^&#34;\n{]*)(:)(\n)">
+      <rule pattern="((?:(?!//)[^&#34;\n{])*?)(:)(\n)">
         <bygroups>
           <token type="NameTag"/>
           <token type="Punctuation"/>

lexers/testdata/yaml.actual

@@ -11,6 +11,9 @@ nested_comment: # this is a comment right next to a key
   date_comment: 2010-11-12 # comment after date
   single_quote: 'single # quote string' # comment after single quote string
   double_quote: "double # quote string" # comment after double quote string
+  slash_comment: "slash" // comment after double quote string
+  slash_comment_with_colon: "slash" // comment: after double quote string
+  slash_comment_after_literal: slash // comment: after literal
   key: no comment
 
 ################

lexers/testdata/yaml.expected

@@ -66,6 +66,27 @@
   {"type":"TextWhitespace","value":" "},
   {"type":"Comment","value":"# comment after double quote string"},
   {"type":"TextWhitespace","value":"\n  "},
+  {"type":"NameTag","value":"slash_comment"},
+  {"type":"Punctuation","value":":"},
+  {"type":"TextWhitespace","value":" "},
+  {"type":"LiteralStringDouble","value":"\"slash\""},
+  {"type":"TextWhitespace","value":" "},
+  {"type":"Comment","value":"// comment after double quote string"},
+  {"type":"TextWhitespace","value":"\n  "},
+  {"type":"NameTag","value":"slash_comment_with_colon"},
+  {"type":"Punctuation","value":":"},
+  {"type":"TextWhitespace","value":" "},
+  {"type":"LiteralStringDouble","value":"\"slash\""},
+  {"type":"TextWhitespace","value":" "},
+  {"type":"Comment","value":"// comment: after double quote string"},
+  {"type":"TextWhitespace","value":"\n  "},
+  {"type":"NameTag","value":"slash_comment_after_literal"},
+  {"type":"Punctuation","value":":"},
+  {"type":"TextWhitespace","value":" "},
+  {"type":"Literal","value":"slash"},
+  {"type":"TextWhitespace","value":" "},
+  {"type":"Comment","value":"// comment: after literal"},
+  {"type":"TextWhitespace","value":"\n  "},
   {"type":"NameTag","value":"key"},
   {"type":"Punctuation","value":":"},
   {"type":"TextWhitespace","value":" "},