Вывод информации о длительности работы парсера

src/com/annimon/ownlang/Main.java

@@ -1,8 +1,6 @@
 package com.annimon.ownlang;
 
 import com.annimon.ownlang.lib.CallStack;
-import com.annimon.ownlang.lib.Function;
-import com.annimon.ownlang.lib.Functions;
 import com.annimon.ownlang.parser.Lexer;
 import com.annimon.ownlang.parser.Parser;
 import com.annimon.ownlang.parser.Token;
@@ -14,6 +12,7 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.List;
+import java.util.concurrent.TimeUnit;
 
 /**
  * @author aNNiMON
@@ -22,11 +21,11 @@ public final class Main {
 
     public static void main(String[] args) throws IOException {
         if (args.length == 0) {
-            run(readFile("program.own"), true, true);
+            run(readFile("program.own"), true, true, true);
             return;
         }
         
-        boolean showTokens = false, showAst = false;
+        boolean showTokens = false, showAst = false, showMeasurements = false;
         String input = null;
         for (int i = 0; i < args.length; i++) {
             switch (args[i]) {
@@ -40,6 +39,11 @@ public final class Main {
                     showTokens = true;
                     break;
                     
+                case "-m":
+                case "--showtime":
+                    showMeasurements = true;
+                    break;
+                    
                 case "-f":
                 case "--file":
                     if (i + 1 < args.length)  {
@@ -55,23 +59,28 @@ public final class Main {
         if (input == null) {
             throw new IllegalArgumentException("Empty input");
         }
-        run(input, showTokens, showAst);
+        run(input, showTokens, showAst, showMeasurements);
     }
         
     private static String readFile(String file) throws IOException {
         return new String( Files.readAllBytes(Paths.get(file)), "UTF-8");
     }
     
-    private static void run(String input, boolean showTokens, boolean showAst) {
+    private static void run(String input, boolean showTokens, boolean showAst, boolean showMeasurements) {
+        final TimeMeasurement measurement = new TimeMeasurement();
+        measurement.start("Tokenize time");
         final List<Token> tokens = new Lexer(input).tokenize();
+        measurement.stop("Tokenize time");
         if (showTokens) {
             for (int i = 0; i < tokens.size(); i++) {
                 System.out.println(i + " " + tokens.get(i));
             }
         }
         
+        measurement.start("Parse time");
         final Parser parser = new Parser(tokens);
         final Statement program = parser.parse();
+        measurement.stop("Parse time");
         if (showAst) {
             System.out.println(program.toString());
         }
@@ -83,9 +92,15 @@ public final class Main {
 //        program.accept(new VariablePrinter());
         program.accept(new AssignValidator());
         try {
+            measurement.start("Execution time");
             program.execute();
         } catch (Exception ex) {
             handleException(Thread.currentThread(), ex);
+        } finally {
+            if (showMeasurements) {
+                measurement.stop("Execution time");
+                System.out.println(measurement.summary(TimeUnit.MILLISECONDS, true));
+            }
         }
     }
     

src/com/annimon/ownlang/TimeMeasurement.java

@@ -0,0 +1,79 @@
+package com.annimon.ownlang;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+public final class TimeMeasurement {
+
+    private final Map<String, Long> finished, running;
+    
+    public TimeMeasurement() {
+        finished = new HashMap<>();
+        running = new HashMap<>();
+    }
+    
+    public void clear() {
+        finished.clear();
+        running.clear();
+    }
+    
+    public void start(String... names) {
+        final long time = System.nanoTime();
+        for (String name : names) {
+            running.put(name, time);
+        }
+    }
+    
+    public void pause(String... names) {
+        final long time = System.nanoTime();
+        for (String name : names) {
+            if (running.containsKey(name)) {
+                addTime(name, time - running.get(name));
+                running.remove(name);
+            }
+        }
+    }
+    
+    public void stop(String... names) {
+        final long time = System.nanoTime();
+        for (String name : names) {
+            if (running.containsKey(name)) {
+                addTime(name, time - running.get(name));
+            }
+        }
+    }
+    
+    public Map<String, Long> getFinished() {
+        return finished;
+    }
+    
+    public String summary() {
+        return summary(TimeUnit.SECONDS, true);
+    }
+    
+    public String summary(TimeUnit unit, boolean showSummary) {
+        final String unitName = unit.name().toLowerCase();
+        final StringBuilder result = new StringBuilder();
+        long summaryTime = 0;
+        for (Map.Entry<String, Long> entry : finished.entrySet()) {
+            final long convertedTime = unit.convert(entry.getValue(), TimeUnit.NANOSECONDS);
+            summaryTime += convertedTime;
+            
+            result.append(entry.getKey()).append(": ")
+                    .append(convertedTime).append(' ').append(unitName)
+                    .append(System.lineSeparator());
+        }
+        if (showSummary) {
+            result.append("Summary: ")
+                        .append(summaryTime).append(' ').append(unitName)
+                        .append(System.lineSeparator());
+        }
+        return result.toString();
+    }
+    
+    private void addTime(String name, long time) {
+        final long alreadyElapsed = finished.getOrDefault(name, 0L);
+        finished.put(name, alreadyElapsed + time);
+    }
+}