C++: Limit counts to top 500

Author: calumgrant

cpp/ql/src/Telemetry/CompilerErrors.ql

@@ -9,4 +9,5 @@
 import Metrics
 
 from CppMetrics::ErrorCount m
+where RankMetric<CppMetrics::ErrorCount>::getRank(m) <= 500
 select m.toString(), m.getValue()

cpp/ql/src/Telemetry/Metrics.qll

@@ -60,6 +60,14 @@ class QualityMetric extends Metric {
   }
 }
 
+signature class RankedMetric extends Metric {
+  int getValue();
+}
+
+module RankMetric<RankedMetric M> {
+  int getRank(M s) { s = rank[result](M m | | m order by m.getValue() desc) }
+}
+
 /** Various metrics we want to report. */
 module CppMetrics {
   class CompilationUnits extends BaseMetric {
@@ -226,6 +234,8 @@ module CppMetrics {
     int getValue() { result = count(Include i | i.getIncludeText() = include_text) }
 
     string getIncludeText() { result = include_text }
+
+    int getLimit() { result = 2 }
   }
 
   class MissingIncludeCount extends Metric {
@@ -239,6 +249,8 @@ module CppMetrics {
     int getValue() { result = count(CannotOpenFile e | e.getIncludedFile() = include_text) }
 
     string getIncludeText() { result = include_text }
+
+    int getLimit() { result = 20 }
   }
 
   class CompilerErrors extends ExtractionMetric {
@@ -251,6 +263,8 @@ module CppMetrics {
     ErrorCount() { exists(CompilerError e | e.getMessage() = this) }
 
     int getValue() { result = count(CompilerError e | e.getMessage() = this) }
+
+    int getLimit() { result = 10 }
   }
 
   class SyntaxErrorCount extends ExtractionMetric {

cpp/ql/src/Telemetry/MissingIncludes.ql

@@ -9,4 +9,5 @@
 import Metrics
 
 from CppMetrics::MissingIncludeCount e
+where RankMetric<CppMetrics::MissingIncludeCount>::getRank(e) <= 500
 select e.getIncludeText(), e.getValue()

cpp/ql/src/Telemetry/SucceededIncludes.ql

@@ -9,4 +9,5 @@
 import Metrics
 
 from CppMetrics::SucceededIncludeCount m
+where RankMetric<CppMetrics::SucceededIncludeCount>::getRank(m) <= 500
 select m.getIncludeText(), m.getValue()