JS: Support YAML comments.

Author: MathiasVP

javascript/ql/lib/semmle/javascript/Comments.qll

@@ -5,7 +5,7 @@ module;
 import javascript
 
 /**
- * A JavaScript source-code comment.
+ * A JavaScript or YAML source-code comment.
  *
  * Examples:
  *
@@ -14,6 +14,7 @@ import javascript
  * /* a block
  *   comment *&#47
  * <!-- an HTML line comment
+ * # a YAML line comment
  * </pre>
  */
 class Comment extends @comment, Locatable {
@@ -44,13 +45,14 @@ class Comment extends @comment, Locatable {
 }
 
 /**
- * A line comment, that is, either an HTML comment or a `//` comment.
+ * A line comment, that is, an HTML comment, a `//` comment, or a YAML comment.
  *
  * Examples:
  *
  * <pre>
  * // a line comment
  * &lt;!-- an HTML line comment
+ * # a YAML line comment
  * </pre>
  */
 class LineComment extends @line_comment, Comment { }

javascript/ql/lib/semmle/javascript/YAML.qll

@@ -44,6 +44,12 @@ private module YamlSig implements LibYaml::InputSig {
   class ParseErrorBase extends LocatableBase, @yaml_error {
     string getMessage() { yaml_errors(this, result) }
   }
+
+  class CommentBase extends LocatableBase, @yaml_comment {
+    string getText() { yaml_comments(this, result, _) }
+
+    override string toString() { yaml_comments(this, _, result) }
+  }
 }
 
 import LibYaml::Make<YamlSig>

javascript/ql/lib/semmlecode.javascript.dbscheme

@@ -1090,13 +1090,17 @@ yaml_scalars (unique int scalar: @yaml_scalar_node ref,
               int style: int ref,
               string value: string ref);
 
+yaml_comments (unique int id: @yaml_comment,
+               string text: string ref,
+               string tostring: string ref);
+
 yaml_errors (unique int id: @yaml_error,
              string message: string ref);
 
 yaml_locations(unique int locatable: @yaml_locatable ref,
              int location: @location_default ref);
 
-@yaml_locatable = @yaml_node | @yaml_error;
+@yaml_locatable = @yaml_node | @yaml_error | @yaml_comment;
 
 /*- XML Files -*/