Fix to enquote the output of mealy machines in the TFAWriter. (LearnL…

…ib#38) * Fix to enquote the output of mealy machines in the TFAWriter. Closes LearnLib#37. * small refactorings * add changelog notice Co-authored-by: mtf90
Conturing · Feb 24, 2020 · 1c4d519 · 1c4d519
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -11,6 +11,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 * Removed `IOUtil#copy`, `IOUtil.skip`, `NullOutputStream`. Use the Guava equivalents from `ByteStreams` and `CharStreams`.
 
 
+### Fixed
+
+* Correctly enquote outputs containing whitespaces in `TAFWriter` ([#37](https://github.com/LearnLib/automatalib/issues/37), thanks to [Alexander Schieweck](https://github.com/aschieweck)).
+
+
 ## [0.9.0](https://github.com/LearnLib/automatalib/releases/tag/automatalib-0.9.0) - 2020-02-05
 
 [Full changelog](https://github.com/LearnLib/automatalib/compare/automatalib-0.8.0...automatalib-0.9.0)

diff --git a/serialization/taf/src/main/java/net/automatalib/serialization/taf/writer/TAFWriter.java b/serialization/taf/src/main/java/net/automatalib/serialization/taf/writer/TAFWriter.java
@@ -165,7 +165,7 @@ private void writeTransition(Collection<?> symbols, String target, @Nullable Obj
         writeIndent();
         writeStringCollection(symbols);
         if (output != null) {
-            out.append(" / ").append(output.toString());
+            out.append(" / ").append(StringUtil.enquoteIfNecessary(output.toString()));
         }
         out.append(" -> ").append(target).append(System.lineSeparator());
     }

diff --git a/serialization/taf/src/test/java/net/automatalib/serialization/taf/TAFSerializationTest.java b/serialization/taf/src/test/java/net/automatalib/serialization/taf/TAFSerializationTest.java
@@ -41,36 +41,39 @@
  */
 public class TAFSerializationTest {
 
-    private static final Alphabet<String> ALPHABET = Alphabets.closedCharStringRange('0', '3');
+    private static final Alphabet<String> INPUT_ALPHABET = Alphabets.closedCharStringRange('0', '3');
+
+    private static final Alphabet<String> OUTPUT_ALPHABET = Alphabets.fromArray("Hello", "World", "Hello World");
 
     private static final int AUTOMATON_SIZE = 20;
 
     @Test
     public void testDFASerialization() throws Exception {
 
-        final CompactDFA<String> automaton = RandomAutomata.randomDFA(new Random(0), AUTOMATON_SIZE, ALPHABET);
+        final CompactDFA<String> automaton = RandomAutomata.randomDFA(new Random(0), AUTOMATON_SIZE, INPUT_ALPHABET);
 
         weedOutTransitions(automaton);
 
         final TAFSerializationDFA serializer = TAFSerializationDFA.getInstance();
-        final DFA<Integer, String> deserializedModel = writeAndReadModel(automaton, ALPHABET, serializer, serializer);
+        final DFA<Integer, String> deserializedModel =
+                writeAndReadModel(automaton, INPUT_ALPHABET, serializer, serializer);
 
-        Assert.assertTrue(Automata.testEquivalence(automaton, deserializedModel, ALPHABET));
+        Assert.assertTrue(Automata.testEquivalence(automaton, deserializedModel, INPUT_ALPHABET));
     }
 
     @Test
     public void testMealySerialization() throws Exception {
         final CompactMealy<String, String> automaton =
-                RandomAutomata.randomMealy(new Random(0), AUTOMATON_SIZE, ALPHABET, ALPHABET);
+                RandomAutomata.randomMealy(new Random(0), AUTOMATON_SIZE, INPUT_ALPHABET, OUTPUT_ALPHABET);
 
         weedOutTransitions(automaton);
 
         final TAFSerializationMealy serializer = TAFSerializationMealy.getInstance();
 
         final MealyMachine<?, String, ?, String> deserializedModel =
-                writeAndReadModel(automaton, ALPHABET, serializer, serializer);
+                writeAndReadModel(automaton, INPUT_ALPHABET, serializer, serializer);
 
-        Assert.assertTrue(Automata.testEquivalence(automaton, deserializedModel, ALPHABET));
+        Assert.assertTrue(Automata.testEquivalence(automaton, deserializedModel, INPUT_ALPHABET));
     }
 
     private <T, A extends MutableDeterministic<Integer, String, T, ?, ?>> void weedOutTransitions(A automaton) {
@@ -80,7 +83,7 @@ public void testMealySerialization() throws Exception {
         // remove some transitions for partiality
         for (int i = 0; i < AUTOMATON_SIZE; i++) {
             final int rState = random.nextInt(AUTOMATON_SIZE);
-            final String rInput = ALPHABET.getSymbol(random.nextInt(ALPHABET.size()));
+            final String rInput = INPUT_ALPHABET.getSymbol(random.nextInt(INPUT_ALPHABET.size()));
 
             automaton.removeTransition(rState, rInput, automaton.getTransition(rState, rInput));
         }