field.tag as FastTag (Issue #134)

framework/src/play/templates/FastTags.java

@@ -7,10 +7,13 @@
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
+
 import play.cache.Cache;
 import play.data.validation.Error;
 import play.data.validation.Validation;
@@ -19,6 +22,7 @@
 import play.exceptions.TemplateNotFoundException;
 import play.libs.Codec;
 import play.mvc.Router.ActionDefinition;
+import play.mvc.Scope.Flash;
 import play.mvc.Scope.Session;
 import play.templates.GroovyTemplate.ExecutableTemplate;
 
@@ -99,6 +103,52 @@ public static void _form(Map<?, ?> args, Closure body, PrintWriter out, Executab
         out.println(JavaExtensions.toString(body));
         out.print("</form>");
     }
+
+    /**
+     * The field tag is a helper, based on the spirit of Don't Repeat Yourself. 
+     * @param args tag attributes
+     * @param body tag inner body
+     * @param out the output writer
+     * @param template enclosing template
+     * @param fromLine template line number where the tag is defined
+     */
+    public static void _field(Map<?, ?> args, Closure body, PrintWriter out, ExecutableTemplate template, int fromLine) {
+        Map<String,Object> field = new HashMap<String,Object>();
+        String _arg = args.get("arg").toString();
+        field.put("name", _arg);
+        field.put("id", _arg.replace('.','_'));
+        field.put("flash", Flash.current().get(_arg));
+        field.put("flashArray", field.get("flash") != null && !field.get("flash").toString().isEmpty() ? field.get("flash").toString().split(",") : new String[0]);
+        field.put("error", Validation.error(_arg));
+        field.put("errorClass", field.get("error") != null ? "hasError" : "");
+        String[] pieces = _arg.split("\\.");
+        Object obj = body.getProperty(pieces[0]);
+        if(obj != null){
+            if(pieces.length > 1){
+                for(int i = 1; i < pieces.length; i++){
+                    try{
+                        Field f = obj.getClass().getField(pieces[i]);
+                        if(i == (pieces.length-1)){
+                            try{
+                                Method getter = obj.getClass().getMethod("get"+JavaExtensions.capFirst(f.getName()));
+                                field.put("value", getter.invoke(obj, new Object[0]));
+                            }catch(NoSuchMethodException e){
+                                field.put("value",f.get(obj).toString());
+                            }
+                        }else{
+                            obj = f.get(obj);
+                        }
+                    }catch(Exception e){
+                        // if there is a problem reading the field we dont set any value
+                    }
+                }
+            }else{
+                field.put("value", obj);
+            }
+        }
+        body.setProperty("field", field);
+        body.call();
+    }
 
     /**
      * Generates a html link to a controller action