Swift: Clean up and improve consistency.

Author: geoffw0

swift/ql/src/queries/Summary/FlowSources.ql

@@ -9,13 +9,21 @@
  * @tags summary
  */
 
+/*
+ * Most queries compute data flow from one of the following sources:
+ *  - flow sources (listed by this query, `swift/summary/flow-sources`).
+ *  - sensitive expressions (see `swift/summary/sensitive-expressions`).
+ *  - constant values.
+ *  - custom per-query sources.
+ */
+
 import swift
 import codeql.swift.dataflow.FlowSources
 
 string sourceClass(FlowSource s) {
-  s instanceof LocalFlowSource and result = "LocalFlowSource"
+  s instanceof LocalFlowSource and result = "Local flow source"
   or
-  s instanceof RemoteFlowSource and result = "RemoteFlowSource"
+  s instanceof RemoteFlowSource and result = "Remote flow source"
 }
 
 from FlowSource s

swift/ql/src/queries/Summary/SummaryStats.ql

@@ -1,5 +1,5 @@
 /**
- * @name Summary statistics
+ * @name Summary Statistics
  * @description A table of summary statistics about a database.
  * @kind table
  * @id swift/summary/summary-statistics
@@ -59,6 +59,9 @@ predicate statistic(string what, string value) {
   what = "Taint reach (per million nodes)" and value = taintReach().toString()
   or
   what = "Regular expression evals" and value = count(RegexEval e).toString()
+  or
+  what = "Regular expression evals with associated regex" and
+  value = count(RegexEval e | exists(e.getARegex())).toString()
 }
 
 from string what, string value