Provide ScriptEngine.FILENAME for @JavaScriptResource

boot-script/pom.xml

@@ -55,7 +55,7 @@
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-compiler-plugin</artifactId>
             <configuration>
-               <source>1.8</source>
+               <source>19</source>
                <target>1.8</target>
             </configuration>
          </plugin>

boot-script/src/main/java/net/java/html/boot/script/ScriptPresenter.java

@@ -19,6 +19,7 @@
 package net.java.html.boot.script;
 
 import java.io.Closeable;
+import java.io.File;
 import java.io.IOException;
 import java.io.Reader;
 import java.lang.ref.WeakReference;
@@ -28,6 +29,7 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
+import java.util.concurrent.Callable;
 import java.util.concurrent.Executor;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -37,6 +39,7 @@
 import javax.script.ScriptEngine;
 import javax.script.ScriptEngineManager;
 import javax.script.ScriptException;
+import javax.script.SimpleScriptContext;
 import net.java.html.boot.script.impl.Callback;
 import net.java.html.boot.script.impl.PromisePolyfill;
 import org.netbeans.html.boot.spi.Fn;
@@ -157,7 +160,18 @@ public void displayPage(URL page, Runnable onPageLoad) {
 
     @Override
     public void loadScript(Reader code) throws Exception {
-        eng.eval(code);
+        var ctx = eng.getContext();
+        if (code instanceof Callable<?> moreInfo && moreInfo.call() instanceof URL u) {
+            try {
+                var file = new File(u.toURI());
+                if (file.exists()) {
+                    ctx.setAttribute(ScriptEngine.FILENAME, file.getPath(), ScriptContext.ENGINE_SCOPE);
+                }
+            } catch (IllegalArgumentException ex) {
+                // ignore URLs not representing a file
+            }
+        }
+        eng.eval(code, ctx);
     }
 
     //

boot-script/src/test/java/net/java/html/boot/script/ScriptEngineCase.java

@@ -23,7 +23,6 @@
 import java.lang.reflect.Method;
 import net.java.html.js.JavaScriptBody;
 import org.netbeans.html.boot.spi.Fn;
-import org.netbeans.html.boot.impl.FnContext;
 import org.testng.IHookCallBack;
 import org.testng.IHookable;
 import org.testng.ITest;

boot-script/src/test/java/net/java/html/boot/script/ScriptEngineEvalTest.java

@@ -0,0 +1,71 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+package net.java.html.boot.script;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.regex.Pattern;
+import net.java.html.js.JavaScriptBody;
+import net.java.html.js.JavaScriptResource;
+import org.netbeans.html.boot.spi.Fn;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+@JavaScriptResource("throw.js")
+public final class ScriptEngineEvalTest {
+    public ScriptEngineEvalTest() {
+    }
+
+    @Test
+    public void fileNameIsDefinedWhenEvaluatingAResourceFile() throws Exception {
+        try (var p = Fn.activate(Scripts.newPresenter().build())) {
+            yieldError("Everything is OK!");
+        } catch (Exception ex) {
+            assertStackContains(ex,
+                "Caused by.*Exception: Everything is OK!",
+                "at <js>.yieldError.*throw.js:[0-9]+",
+                "at <js>.*anonymous.*eval.*[0-9]+"
+            );
+        }
+    }
+
+    @JavaScriptBody(args = { "msg" }, body = """
+    yieldError(msg);
+    """)
+    private static void yieldError(String msg) {
+        throw new AssertionError(msg);
+    }
+
+    private void assertStackContains(Exception ex, String... patterns) {
+        var w = new StringWriter();
+        ex.printStackTrace(new PrintWriter(w));
+        var lines = w.toString().split("\n");
+
+        FOUND: for (var p : patterns) {
+            var c = Pattern.compile(p);
+            for (var l : lines) {
+                if (c.matcher(l).find()) {
+                    continue FOUND;
+                }
+            }
+            Assert.fail("Cannot find " + p + " in:\n" + w);
+        }
+    }
+
+}

boot-script/src/test/resources/net/java/html/boot/script/throw.js

@@ -0,0 +1,22 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+function yieldError(msg) {
+    throw msg;
+}