Fix substitute inside includes to respect lists

config/src/main/java/com/typesafe/config/impl/ConfigParser.java

@@ -190,10 +190,10 @@ final class ConfigParser {
             // we really should make this work, but for now throwing an
             // exception is better than producing an incorrect result.
             // See https://github.com/typesafehub/config/issues/160
-            if (arrayCount > 0 && obj.resolveStatus() != ResolveStatus.RESOLVED)
-                throw parseError("Due to current limitations of the config parser, when an include statement is nested inside a list value, "
-                        + "${} substitutions inside the included file cannot be resolved correctly. Either move the include outside of the list value or "
-                        + "remove the ${} statements from the included file.");
+//            if (arrayCount > 0 && obj.resolveStatus() != ResolveStatus.RESOLVED)
+//                throw parseError("Due to current limitations of the config parser, when an include statement is nested inside a list value, "
+//                        + "${} substitutions inside the included file cannot be resolved correctly. Either move the include outside of the list value or "
+//                        + "remove the ${} statements from the included file.");
 
             if (!pathStack.isEmpty()) {
                 Path prefix = fullCurrentPath();
@@ -245,10 +245,10 @@ final class ConfigParser {
                         // an exception is better than producing an incorrect
                         // result. See
                         // https://github.com/typesafehub/config/issues/160
-                        if (arrayCount > 0)
-                            throw parseError("Due to current limitations of the config parser, += does not work nested inside a list. "
-                                    + "+= expands to a ${} substitution and the path in ${} cannot currently refer to list elements. "
-                                    + "You might be able to move the += outside of the list and then refer to it from inside the list with ${}.");
+//                        if (arrayCount > 0)
+//                            throw parseError("Due to current limitations of the config parser, += does not work nested inside a list. "
+//                                    + "+= expands to a ${} substitution and the path in ${} cannot currently refer to list elements. "
+//                                    + "You might be able to move the += outside of the list and then refer to it from inside the list with ${}.");
 
                         // because we will put it in an array after the fact so
                         // we want this to be incremented during the parseValue
@@ -356,6 +356,8 @@ final class ConfigParser {
 
             AbstractConfigValue v = null;
 
+            int index = 0;
+
             for (AbstractConfigNode node : n.children()) {
                 if (node instanceof ConfigNodeComment) {
                     comments.add(((ConfigNodeComment) node).commentText());
@@ -376,7 +378,9 @@ final class ConfigParser {
                         values.add(v.withOrigin(v.origin().appendComments(new ArrayList<String>(comments))));
                         comments.clear();
                     }
+                    pathStack.push(new Path(Integer.toString(index)));
                     v = parseValue((AbstractConfigNodeValue)node, comments);
+                    pathStack.pop();
                 }
             }
             // There shouldn't be any comments at this point, but add them just in case

config/src/main/java/com/typesafe/config/impl/ResolveSource.java

@@ -55,11 +55,15 @@ final class ResolveSource {
         }
     }
 
-    static private ValueWithPath findInObject(AbstractConfigObject obj, Path path) {
+    static private ValueWithPath findInObject(AbstractConfigValue obj, Path path) {
         try {
             // we'll fail if anything along the path can't
             // be looked at without resolving.
-            return findInObject(obj, path, null);
+            if (obj instanceof AbstractConfigObject) {
+                return findInObject((AbstractConfigObject) obj, path, null);
+            } else {
+                return findInList((SimpleConfigList) obj, path, null);
+            }
         } catch (ConfigException.NotResolved e) {
             throw ConfigImpl.improveNotResolved(path, e);
         }
@@ -78,6 +82,29 @@ final class ResolveSource {
         } else {
             if (v instanceof AbstractConfigObject) {
                 return findInObject((AbstractConfigObject) v, next, newParents);
+            } else if (v instanceof SimpleConfigList) {
+                return findInList((SimpleConfigList) v, next, newParents);
+            } else {
+                return new ValueWithPath(null, newParents);
+            }
+        }
+    }
+
+    static private ValueWithPath findInList(SimpleConfigList list, Path path, Node<Container> parents) {
+        String key = path.first();
+        Path next = path.remainder();
+        if (ConfigImpl.traceSubstitutionsEnabled())
+            ConfigImpl.trace("*** looking up '" + key + "' in " + list);
+        AbstractConfigValue v = list.get(Integer.parseInt(key));
+        Node<Container> newParents = parents == null ? new Node<Container>(list) : parents.prepend(list);
+
+        if (next == null) {
+            return new ValueWithPath(v, newParents);
+        } else {
+            if (v instanceof AbstractConfigObject) {
+                return findInObject((AbstractConfigObject) v, next, newParents);
+            } else if (v instanceof SimpleConfigList) {
+                return findInList((SimpleConfigList) v, next, newParents);
             } else {
                 return new ValueWithPath(null, newParents);
             }

config/src/main/java/com/typesafe/config/impl/SimpleConfig.java

@@ -75,8 +75,9 @@ final class SimpleConfig implements Config, MergeableValue, Serializable {
 
         if (resolved == object)
             return this;
-        else
+        else {
             return new SimpleConfig((AbstractConfigObject) resolved);
+        }
     }
 
     private ConfigValue hasPathPeek(String pathExpression) {

config/src/test/resources/include-from-list.conf

@@ -1,5 +1,10 @@
 // The {} inside the [] is needed because
 // just [ include ] means an array with the
 // string "include" in it.
-a = [ { include "test01.conf" } ]
+a = [
+    {
+       include "test12.conf"
+       replace-key: "replaced"
+     }
+ ]
 

config/src/test/scala/com/typesafe/config/impl/ConfParserTest.scala

@@ -801,6 +801,14 @@ class ConfParserTest extends TestUtils {
         assertTrue("including basename URL doesn't load anything", conf.isEmpty())
     }
 
+    @Test
+    def includeWithSubstitutionsInArray() {
+        val conf = ConfigFactory.parseString("include file(" + jsonQuotedResourceFile("include-from-list") + ")")
+
+        val resolved = conf.resolve()
+        assertEquals(resolved.getConfigList("a").get(0).getString("replace-me"), "replaced")
+    }
+
     @Test
     def acceptBOMStartingFile() {
         // BOM at start of file should be ignored