Restructuring of Array#inspect and missing enc checks rb_inspect.

Author: headius

core/src/main/java/org/jruby/RubyArray.java

@@ -39,6 +39,7 @@
 
 import org.jcodings.Encoding;
 import org.jcodings.specific.USASCIIEncoding;
+import org.jcodings.specific.UTF16BEEncoding;
 import org.jruby.anno.JRubyClass;
 import org.jruby.anno.JRubyMethod;
 import org.jruby.common.IRubyWarnings.ID;
@@ -1444,15 +1445,15 @@ private IRubyObject inspectAry(ThreadContext context) {
         boolean tainted = isTaint();
 
         for (int i = 0; i < realLength; i++) {
-            if (i > 0) str.cat((byte)',').cat((byte)' ');
 
-            RubyString str2 = inspect(context, safeArrayRef(values, begin + i));
-            if (i == 0 && str2.getEncoding() != encoding) str.setEncoding(str2.getEncoding());
-            if (str2.isTaint()) tainted = true;
-            
-            str.cat19(str2);
+            RubyString s = inspect(context, safeArrayRef(values, begin + i));
+            if (s.isTaint()) tainted = true;
+            if (i > 0) str.cat(',', UTF16BEEncoding.INSTANCE).cat(' ', UTF16BEEncoding.INSTANCE);
+            else str.setEncoding(s.getEncoding());
+
+            str.cat19(s);
         }
-        str.cat((byte)']');
+        str.cat(']', UTF16BEEncoding.INSTANCE);
 
         if (tainted) str.setTaint(true);
 

core/src/main/java/org/jruby/RubyObject.java

@@ -45,6 +45,7 @@
 import java.util.List;
 import java.util.Set;
 
+import org.jcodings.Encoding;
 import org.jruby.anno.JRubyClass;
 import org.jruby.runtime.Helpers;
 import org.jruby.runtime.Block;
@@ -532,7 +533,19 @@ private int nonFixnumHashCode(IRubyObject hashValue) {
      * Prefered over callMethod(context, "inspect")
      */
     public static RubyString inspect(ThreadContext context, IRubyObject object) {
-        return RubyString.objAsString(context, object.callMethod(context, "inspect"));
+        Ruby runtime = context.runtime;
+        RubyString str = RubyString.objAsString(context, object.callMethod(context, "inspect"));
+        Encoding ext = runtime.getDefaultExternalEncoding();
+        if (!ext.isAsciiCompatible()) {
+            if (!str.isAsciiOnly()) {
+                throw runtime.newEncodingCompatibilityError("inspected result must be ASCII only if default external encoding is ASCII incompatible");
+            }
+            return str;
+        }
+        if (str.getEncoding() != ext && !str.isAsciiOnly()) {
+            throw runtime.newEncodingCompatibilityError("inspected result must be ASCII only or use the default external encoding");
+        }
+        return str;
     }
 
     /**