C#: use shared AlertSuppression.qll

Author: aibaars

csharp/ql/src/AlertSuppression.ql

@@ -5,68 +5,20 @@
  * @id cs/alert-suppression
  */
 
-import csharp
+private import codeql.suppression.AlertSuppression as AS
+private import semmle.code.csharp.Comments
 
-/**
- * An alert suppression comment.
- */
-class SuppressionComment extends CommentLine {
-  string annotation;
-
-  SuppressionComment() {
+class SingleLineComment extends CommentLine {
+  SingleLineComment() {
     // Must be either `// ...` or `/* ... */` on a single line.
-    this.getRawText().regexpMatch("//.*|/\\*.*\\*/") and
-    exists(string text | text = this.getText() |
-      // match `lgtm[...]` anywhere in the comment
-      annotation = text.regexpFind("(?i)\\blgtm\\s*\\[[^\\]]*\\]", _, _)
-      or
-      // match `lgtm` at the start of the comment and after semicolon
-      annotation = text.regexpFind("(?i)(?<=^|;)\\s*lgtm(?!\\B|\\s*\\[)", _, _).trim()
-    )
-  }
-
-  /** Gets the suppression annotation in this comment. */
-  string getAnnotation() { result = annotation }
-
-  /**
-   * Holds if this comment applies to the range from column `startcolumn` of line `startline`
-   * to column `endcolumn` of line `endline` in file `filepath`.
-   */
-  predicate covers(string filepath, int startline, int startcolumn, int endline, int endcolumn) {
-    this.getLocation().hasLocationInfo(filepath, startline, _, endline, endcolumn) and
-    startcolumn = 1
+    this.getRawText().regexpMatch("//.*|/\\*.*\\*/")
   }
 
-  /** Gets the scope of this suppression. */
-  SuppressionScope getScope() { this = result.getSuppressionComment() }
-}
-
-/**
- * The scope of an alert suppression comment.
- */
-class SuppressionScope extends @commentline instanceof SuppressionComment {
-  /** Gets a suppression comment with this scope. */
-  SuppressionComment getSuppressionComment() { result = this }
-
-  /**
-   * Holds if this element is at the specified location.
-   * The location spans column `startcolumn` of line `startline` to
-   * column `endcolumn` of line `endline` in file `filepath`.
-   * For more information, see
-   * [Locations](https://codeql.github.com/docs/writing-codeql-queries/providing-locations-in-codeql-queries/).
-   */
   predicate hasLocationInfo(
     string filepath, int startline, int startcolumn, int endline, int endcolumn
   ) {
-    super.covers(filepath, startline, startcolumn, endline, endcolumn)
+    this.getLocation().hasLocationInfo(filepath, startline, startcolumn, endline, endcolumn)
   }
-
-  /** Gets a textual representation of this element. */
-  string toString() { result = "suppression range" }
 }
 
-from SuppressionComment c
-select c, // suppression comment
-  c.getText(), // text of suppression comment (excluding delimiters)
-  c.getAnnotation(), // text of suppression annotation
-  c.getScope() // scope of suppression
+import AS::Make<SingleLineComment>

csharp/ql/src/qlpack.yml

@@ -9,3 +9,4 @@ defaultSuiteFile: codeql-suites/csharp-code-scanning.qls
 dependencies:
   codeql/csharp-all: ${workspace}
   codeql/suite-helpers: ${workspace}
+  codeql/util: ${workspace}