Use gradle-velocity-task.

Update PreprocessorListener to be an interface.
Make Source.getName() public.

7 files changed, 101 insertions, 42 deletions

diff --git a/src/main/java/org/anarres/cpp/CppTask.java b/src/main/java/org/anarres/cpp/CppTask.java
index 5e17786..55a8eff 100644
--- a/src/main/java/org/anarres/cpp/CppTask.java
+++ b/src/main/java/org/anarres/cpp/CppTask.java
@@ -34,7 +34,7 @@ import org.apache.tools.ant.types.Path;
  */
 public class CppTask extends Copy {
 
-    private class Listener extends PreprocessorListener {
+    private class Listener extends DefaultPreprocessorListener {
 
         @Override
         protected void print(String msg) {
diff --git a/src/main/java/org/anarres/cpp/DefaultPreprocessorListener.java b/src/main/java/org/anarres/cpp/DefaultPreprocessorListener.java
new file mode 100644
index 0000000..6d3929d
--- /dev/null
+++ b/src/main/java/org/anarres/cpp/DefaultPreprocessorListener.java
@@ -0,0 +1,89 @@
+package org.anarres.cpp;
+
+/*
+ * Anarres C Preprocessor
+ * Copyright (c) 2007-2008, Shevek
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+import javax.annotation.Nonnegative;
+
+/**
+ * A handler for preprocessor events, primarily errors and warnings.
+ *
+ * If no PreprocessorListener is installed in a Preprocessor, all
+ * error and warning events will throw an exception. Installing a
+ * listener allows more intelligent handling of these events.
+ */
+public class DefaultPreprocessorListener implements PreprocessorListener {
+
+    private int errors;
+    private int warnings;
+
+    public DefaultPreprocessorListener() {
+        clear();
+    }
+
+    public void clear() {
+        errors = 0;
+        warnings = 0;
+    }
+
+    @Nonnegative
+    public int getErrors() {
+        return errors;
+    }
+
+    @Nonnegative
+    public int getWarnings() {
+        return warnings;
+    }
+
+    protected void print(String msg) {
+        System.err.println(msg);
+    }
+
+    /**
+     * Handles a warning.
+     *
+     * The behaviour of this method is defined by the
+     * implementation. It may simply record the error message, or
+     * it may throw an exception.
+     */
+    public void handleWarning(Source source, int line, int column,
+            String msg)
+            throws LexerException {
+        warnings++;
+        print(source.getName() + ":" + line + ":" + column
+                + ": warning: " + msg);
+    }
+
+    /**
+     * Handles an error.
+     *
+     * The behaviour of this method is defined by the
+     * implementation. It may simply record the error message, or
+     * it may throw an exception.
+     */
+    public void handleError(Source source, int line, int column,
+            String msg)
+            throws LexerException {
+        errors++;
+        print(source.getName() + ":" + line + ":" + column
+                + ": error: " + msg);
+    }
+
+    public void handleSourceChange(Source source, String event) {
+    }
+
+}
diff --git a/src/main/java/org/anarres/cpp/FileLexerSource.java b/src/main/java/org/anarres/cpp/FileLexerSource.java
index 1505506..bd6cbb7 100644
--- a/src/main/java/org/anarres/cpp/FileLexerSource.java
+++ b/src/main/java/org/anarres/cpp/FileLexerSource.java
@@ -79,7 +79,7 @@ public class FileLexerSource extends LexerSource {
     }
 
     @Override
-    /* pp */ String getName() {
+    public String getName() {
         return getPath();
     }
 
diff --git a/src/main/java/org/anarres/cpp/InputLexerSource.java b/src/main/java/org/anarres/cpp/InputLexerSource.java
index 3e1dcb3..fac7c51 100644
--- a/src/main/java/org/anarres/cpp/InputLexerSource.java
+++ b/src/main/java/org/anarres/cpp/InputLexerSource.java
@@ -53,7 +53,7 @@ public class InputLexerSource extends LexerSource {
     }
 
     @Override
-    /* pp */ String getName() {
+    public String getName() {
         return "standard input";
     }
 
diff --git a/src/main/java/org/anarres/cpp/Main.java b/src/main/java/org/anarres/cpp/Main.java
index 1902798..4c50b70 100644
--- a/src/main/java/org/anarres/cpp/Main.java
+++ b/src/main/java/org/anarres/cpp/Main.java
@@ -92,7 +92,7 @@ public class Main {
         pp.addFeature(Feature.TRIGRAPHS);
         pp.addFeature(Feature.LINEMARKERS);
         pp.addWarning(Warning.IMPORT);
-        pp.setListener(new PreprocessorListener());
+        pp.setListener(new DefaultPreprocessorListener());
         pp.addMacro("__JCPP__");
         pp.getSystemIncludePath().add("/usr/local/include");
         pp.getSystemIncludePath().add("/usr/include");
diff --git a/src/main/java/org/anarres/cpp/PreprocessorListener.java b/src/main/java/org/anarres/cpp/PreprocessorListener.java
index a5b4339..6a4cb22 100644
--- a/src/main/java/org/anarres/cpp/PreprocessorListener.java
+++ b/src/main/java/org/anarres/cpp/PreprocessorListener.java
@@ -23,31 +23,7 @@ package org.anarres.cpp;
  * error and warning events will throw an exception. Installing a
  * listener allows more intelligent handling of these events.
  */
-public class PreprocessorListener {
-
-    private int errors;
-    private int warnings;
-
-    public PreprocessorListener() {
-        clear();
-    }
-
-    public void clear() {
-        errors = 0;
-        warnings = 0;
-    }
-
-    public int getErrors() {
-        return errors;
-    }
-
-    public int getWarnings() {
-        return warnings;
-    }
-
-    protected void print(String msg) {
-        System.err.println(msg);
-    }
+public interface PreprocessorListener {
 
     /**
      * Handles a warning.
@@ -58,11 +34,7 @@ public class PreprocessorListener {
      */
     public void handleWarning(Source source, int line, int column,
             String msg)
-            throws LexerException {
-        warnings++;
-        print(source.getName() + ":" + line + ":" + column
-                + ": warning: " + msg);
-    }
+            throws LexerException;
 
     /**
      * Handles an error.
@@ -73,13 +45,8 @@ public class PreprocessorListener {
      */
     public void handleError(Source source, int line, int column,
             String msg)
-            throws LexerException {
-        errors++;
-        print(source.getName() + ":" + line + ":" + column
-                + ": error: " + msg);
-    }
+            throws LexerException;
 
-    public void handleSourceChange(Source source, String event) {
-    }
+    public void handleSourceChange(Source source, String event);
 
 }
diff --git a/src/main/java/org/anarres/cpp/Source.java b/src/main/java/org/anarres/cpp/Source.java
index ef20803..291113a 100644
--- a/src/main/java/org/anarres/cpp/Source.java
+++ b/src/main/java/org/anarres/cpp/Source.java
@@ -20,6 +20,7 @@ import java.io.Closeable;
 import java.io.IOException;
 import java.util.Iterator;
 import javax.annotation.CheckForNull;
+import javax.annotation.Nonnegative;
 import javax.annotation.Nonnull;
 import static org.anarres.cpp.Token.*;
 
@@ -139,7 +140,8 @@ public abstract class Source implements Iterable<Token>, Closeable {
     /**
      * Returns the human-readable name of the current Source.
      */
-    /* pp */ String getName() {
+    @CheckForNull
+    public String getName() {
         Source parent = getParent();
         if (parent != null)
             return parent.getName();
@@ -149,6 +151,7 @@ public abstract class Source implements Iterable<Token>, Closeable {
     /**
      * Returns the current line number within this Source.
      */
+    @Nonnegative
     public int getLine() {
         Source parent = getParent();
         if (parent == null)