juplo:variables accepts expressions as arguments

juplo.variables now also accepts an expression as argument.
If the parameter can not be parsed as an expression, it is handeld as before
(i.e. parsed as JSON, if possible, tried to be reolved, if not). If the
expression evaluates to an empty string, the parameter is ignored.

diff --git a/src/main/java/de/juplo/thymeleaf/ImportVariablesAttrProcessor.java b/src/main/java/de/juplo/thymeleaf/ImportVariablesAttrProcessor.java
index e864ab1..aac37a6 100644 (file)
--- a/src/main/java/de/juplo/thymeleaf/ImportVariablesAttrProcessor.java
+++ b/src/main/java/de/juplo/thymeleaf/ImportVariablesAttrProcessor.java
@@ -22,9 +22,13 @@ import org.thymeleaf.context.IContext;
 import org.thymeleaf.context.VariablesMap;
 import org.thymeleaf.dom.Element;
 import org.thymeleaf.dom.Node;
+import org.thymeleaf.exceptions.TemplateProcessingException;
 import org.thymeleaf.processor.ProcessorResult;
 import org.thymeleaf.processor.attr.AbstractAttrProcessor;
 import org.thymeleaf.resourceresolver.IResourceResolver;
+import org.thymeleaf.standard.expression.IStandardExpression;
+import org.thymeleaf.standard.expression.IStandardExpressionParser;
+import org.thymeleaf.standard.expression.StandardExpressions;
 import org.thymeleaf.templateresolver.ITemplateResolver;
 import org.thymeleaf.templateresolver.TemplateResolution;
 
@@ -65,7 +69,25 @@ public class ImportVariablesAttrProcessor extends AbstractAttrProcessor
       )
   {
     Configuration config = arguments.getConfiguration();
+
+    Configuration configuration = arguments.getConfiguration();
+
     String parameter = element.getAttributeValue(name);
+    try
+    {
+      IStandardExpressionParser parser =
+          StandardExpressions.getExpressionParser(configuration);
+      IStandardExpression expression =
+          parser.parseExpression(configuration, arguments, parameter);
+      parameter = (String)expression.execute(configuration, arguments);
+    }
+    catch (TemplateProcessingException e) { }
+
+    if (parameter != null && !parameter.trim().isEmpty())
+    {
+      LOG.info("ignoring empty parameter");
+      return ProcessorResult.OK;
+    }
 
     Iterator<Entry<String, Object>> it = null;