cache TooManyLinesOfCodeInFunctionCheck.getNumberOfLine

this function is called 3 times for each function declaration
* TooManyLinesOfCodeInFunctionCheck
* CxxFunctionComplexitySquidSensor
* CxxFunctionSizeSquidSensor

solution: calculate only once and store this metric
in CxxMetric.LINES_OF_CODE_IN_FUNCION_BODY

Author: ivangalkin

cxx-checks/src/main/java/org/sonar/cxx/checks/metrics/TooManyLinesOfCodeInFunctionCheck.java

@@ -26,10 +26,12 @@
 import org.sonar.check.Rule;
 import org.sonar.check.RuleProperty;
 import org.sonar.cxx.api.CppPunctuator;
+import org.sonar.cxx.api.CxxMetric;
 import org.sonar.cxx.parser.CxxGrammarImpl;
 import org.sonar.cxx.tag.Tag;
 import org.sonar.squidbridge.annotations.ActivatedByDefault;
 import org.sonar.squidbridge.annotations.SqaleConstantRemediation;
+import org.sonar.squidbridge.api.SourceFunction;
 import org.sonar.squidbridge.checks.SquidCheck;
 
 @Rule(key = "TooManyLinesOfCodeInFunction",
@@ -56,7 +58,8 @@ public void init() {
 
   @Override
   public void leaveNode(AstNode node) {
-    int lineCount = getNumberOfLine(node);
+    SourceFunction sourceFunction = (SourceFunction) getContext().peekSourceCode();
+    int lineCount = sourceFunction.getInt(CxxMetric.LINES_OF_CODE_IN_FUNCTION_BODY);
     if (lineCount > max) {
       getContext().createLineViolation(this,
         "The number of code lines in this function is {0,number,integer} which is greater than "
@@ -65,31 +68,6 @@ public void leaveNode(AstNode node) {
     }
   }
 
-  /**
-   * aggregates lines for child nodes
-   *
-   * @param node with child nodes
-   * @return number of lines
-   */
-  public static int getNumberOfLine(AstNode node) {
-    List<AstNode> allChilds = node.getDescendants(CxxGrammarImpl.statement, CppPunctuator.CURLBR_LEFT,
-      CppPunctuator.CURLBR_RIGHT);
-    int lines = 1;
-    int firstLine = node.getTokenLine();
-    if (allChilds != null && !allChilds.isEmpty()) {
-      int previousLine = firstLine;
-      int currentLine = 0;
-      for (AstNode child : allChilds) {
-        currentLine = child.getTokenLine();
-        if (currentLine != previousLine) {
-          lines++;
-          previousLine = currentLine;
-        }
-      }
-    }
-    return lines;
-  }
-
   public void setMax(int max) {
     this.max = max;
   }

cxx-sensors/src/main/java/org/sonar/cxx/sensors/functioncomplexity/CxxFunctionComplexitySquidSensor.java

@@ -29,7 +29,6 @@
 import org.sonar.api.utils.log.Loggers;
 import org.sonar.cxx.CxxLanguage;
 import org.sonar.cxx.api.CxxMetric;
-import static org.sonar.cxx.checks.TooManyLinesOfCodeInFunctionCheck.getNumberOfLine;
 import org.sonar.cxx.parser.CxxGrammarImpl;
 import org.sonar.cxx.sensors.squid.SquidSensor;
 import org.sonar.squidbridge.SquidAstVisitor;
@@ -73,16 +72,16 @@ public SquidAstVisitor<Grammar> getVisitor() {
 
   @Override
   public void init() {
-        subscribeTo(CxxGrammarImpl.functionDefinition);
+    subscribeTo(CxxGrammarImpl.functionBody);
   }
 
   @Override
   public void leaveNode(AstNode node) {
       SourceFunction sourceFunction = (SourceFunction) getContext().peekSourceCode();
-      SourceFile sourceFile = (SourceFile)sourceFunction.getAncestor(SourceFile.class);
+      SourceFile sourceFile = sourceFunction.getAncestor(SourceFile.class);
 
       int complexity = ChecksHelper.getRecursiveMeasureInt(sourceFunction, CxxMetric.COMPLEXITY);
-      int lineCount = getNumberOfLine(node);
+      int lineCount = sourceFunction.getInt(CxxMetric.LINES_OF_CODE_IN_FUNCTION_BODY);
 
       incrementFunctionByThresholdForAllFiles(complexity, lineCount);
       incrementFunctionByThresholdForFile(sourceFile, complexity, lineCount);
@@ -137,13 +136,13 @@ private void publishComplexFunctionMetricsForFile(InputFile inputFile, SourceFil
     context.<Integer>newMeasure()
       .forMetric(FunctionComplexityMetrics.COMPLEX_FUNCTIONS)
       .on(inputFile)
-      .withValue((int)c.countOverThreshold)
+      .withValue(c.countOverThreshold)
       .save();
 
     context.<Double>newMeasure()
       .forMetric(FunctionComplexityMetrics.COMPLEX_FUNCTIONS_PERC)
       .on(inputFile)
-      .withValue(calculatePercentual((int)c.countOverThreshold, (int)c.countBelowThreshold))
+      .withValue(calculatePercentual(c.countOverThreshold, c.countBelowThreshold))
       .save();
   }
 
@@ -165,7 +164,7 @@ private void publishLocInComplexFunctionMetricsForFile(InputFile inputFile, Sour
     context.<Double>newMeasure()
       .forMetric(FunctionComplexityMetrics.COMPLEX_FUNCTIONS_LOC_PERC)
       .on(inputFile)
-      .withValue(calculatePercentual((int)locCount.countOverThreshold, (int)locCount.countBelowThreshold))
+      .withValue(calculatePercentual(locCount.countOverThreshold, locCount.countBelowThreshold))
       .save();
   }
 
@@ -206,7 +205,7 @@ private void publishLinesOfCodeInComplexFunctionMetrics(InputModule module, Sens
   private double calculatePercentual(int overThreshold, int belowThreshold){
     double total = (double)overThreshold + (double)belowThreshold;
     if (total > 0) {
-      return ((float)overThreshold * 100.0) / ((float)overThreshold + (float)belowThreshold);
+      return (overThreshold * 100.0) / ((double)overThreshold + (double)belowThreshold);
     }
     else {
       return 0;

cxx-sensors/src/main/java/org/sonar/cxx/sensors/functionsize/CxxFunctionSizeSquidSensor.java

@@ -28,7 +28,8 @@
 import org.sonar.api.utils.log.Logger;
 import org.sonar.api.utils.log.Loggers;
 import org.sonar.cxx.CxxLanguage;
-import static org.sonar.cxx.checks.TooManyLinesOfCodeInFunctionCheck.getNumberOfLine;
+import org.sonar.cxx.api.CxxMetric;
+
 import org.sonar.cxx.parser.CxxGrammarImpl;
 import org.sonar.cxx.sensors.functioncomplexity.FunctionCount;
 import org.sonar.cxx.sensors.squid.SquidSensor;
@@ -71,9 +72,9 @@ public void init() {
   @Override
   public void leaveNode(AstNode node) {
     SourceFunction sourceFunction = (SourceFunction) getContext().peekSourceCode();
-    SourceFile sourceFile = (SourceFile)sourceFunction.getAncestor(SourceFile.class);
+    SourceFile sourceFile = sourceFunction.getAncestor(SourceFile.class);
 
-    int lineCount = getNumberOfLine(node);
+    int lineCount = sourceFunction.getInt(CxxMetric.LINES_OF_CODE_IN_FUNCTION_BODY);
 
     incrementFunctionByThresholdForProject(lineCount);
     incrementFunctionByThresholdForFile(sourceFile, lineCount);
@@ -166,7 +167,7 @@ private void publishLocInBigFunctionForProject(InputModule module, SensorContext
   private double calculatePercentual(int overThreshold, int belowThreshold){
     double total = (double)overThreshold + (double)belowThreshold;
     if (total > 0) {
-      return ((float)overThreshold * 100.0) / ((float)overThreshold + (float)belowThreshold);
+      return (overThreshold * 100.0) / ((double)overThreshold + (double)belowThreshold);
     }
     else {
       return 0;
@@ -184,7 +185,7 @@ private void publishBigFunctionMetrics(InputFile inputFile, SourceFile squidFile
     context.<Integer>newMeasure()
       .forMetric(FunctionSizeMetrics.BIG_FUNCTIONS)
       .on(inputFile)
-      .withValue((int)c.countOverThreshold)
+      .withValue(c.countOverThreshold)
       .save();
 
     context.<Double>newMeasure()

cxx-squid/src/main/java/org/sonar/cxx/CxxAstScanner.java

@@ -36,6 +36,7 @@
 import org.sonar.cxx.visitors.CxxCharsetAwareVisitor;
 import org.sonar.cxx.visitors.CxxCognitiveComplexityVisitor;
 import org.sonar.cxx.visitors.CxxFileVisitor;
+import org.sonar.cxx.visitors.CxxLinesOfCodeInFunctionBodyVisitor;
 import org.sonar.cxx.visitors.CxxLinesOfCodeVisitor;
 import org.sonar.cxx.visitors.CxxParseErrorLoggerVisitor;
 import org.sonar.cxx.visitors.CxxPublicApiVisitor;
@@ -199,6 +200,7 @@ public SourceCode createSourceCode(SourceCode parentSourceCode, AstNode astNode)
     /* Metrics */
     builder.withSquidAstVisitor(new LinesVisitor<>(CxxMetric.LINES));
     builder.withSquidAstVisitor(new CxxLinesOfCodeVisitor<>(CxxMetric.LINES_OF_CODE));
+    builder.withSquidAstVisitor(new CxxLinesOfCodeInFunctionBodyVisitor<>());
     builder.withSquidAstVisitor(new CxxPublicApiVisitor<>(CxxMetric.PUBLIC_API,
       CxxMetric.PUBLIC_UNDOCUMENTED_API)
       .withHeaderFileSuffixes(conf.getHeaderFileSuffixes()));

cxx-squid/src/main/java/org/sonar/cxx/api/CxxMetric.java

@@ -27,6 +27,7 @@ public enum CxxMetric implements MetricDef {
   FILES,
   LINES,
   LINES_OF_CODE,
+  LINES_OF_CODE_IN_FUNCTION_BODY,
   STATEMENTS,
   FUNCTIONS,
   CLASSES,

cxx-squid/src/main/java/org/sonar/cxx/visitors/CxxLinesOfCodeInFunctionBodyVisitor.java

@@ -0,0 +1,65 @@
+/*
+ * Sonar C++ Plugin (Community)
+ * Copyright (C) 2010-2018 SonarOpenCommunity
+ * http://github.com/SonarOpenCommunity/sonar-cxx
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package org.sonar.cxx.visitors;
+
+import java.util.List;
+
+import org.sonar.cxx.api.CppPunctuator;
+import org.sonar.cxx.api.CxxMetric;
+import org.sonar.cxx.parser.CxxGrammarImpl;
+import org.sonar.squidbridge.SquidAstVisitor;
+
+import com.sonar.sslr.api.AstNode;
+import com.sonar.sslr.api.AstVisitor;
+import com.sonar.sslr.api.Grammar;
+
+/**
+ * Visitor that computes the NCLOCs in function body, leading and trailing {} do not count
+ *
+ * @param <GRAMMAR>
+ */
+public class CxxLinesOfCodeInFunctionBodyVisitor<GRAMMAR extends Grammar> extends SquidAstVisitor<GRAMMAR>
+    implements AstVisitor {
+
+  @Override
+  public void init() {
+    subscribeTo(CxxGrammarImpl.functionBody);
+  }
+
+  @Override
+  public void visitNode(AstNode node) {
+    List<AstNode> allChilds = node.getDescendants(CxxGrammarImpl.statement, CppPunctuator.CURLBR_LEFT,
+        CppPunctuator.CURLBR_RIGHT);
+    int lines = 1;
+    int firstLine = node.getTokenLine();
+    if (allChilds != null && !allChilds.isEmpty()) {
+      int previousLine = firstLine;
+      for (AstNode child : allChilds) {
+        int currentLine = child.getTokenLine();
+        if (currentLine != previousLine) {
+          lines++;
+          previousLine = currentLine;
+        }
+      }
+    }
+    getContext().peekSourceCode().add(CxxMetric.LINES_OF_CODE_IN_FUNCTION_BODY, lines);
+  }
+
+}

cxx-squid/src/test/java/org/sonar/cxx/api/CxxMetricTest.java

@@ -27,7 +27,7 @@ public class CxxMetricTest {
   @Test
   public void test() {
     SoftAssertions softly = new SoftAssertions();
-    softly.assertThat(CxxMetric.values()).hasSize(11);
+    softly.assertThat(CxxMetric.values()).hasSize(12);
 
     for (CxxMetric metric : CxxMetric.values()) {
       softly.assertThat(metric.getName()).isEqualTo(metric.name());