WW-4090 Removes double evaluation of parsed expression

git-svn-id: https://svn.apache.org/repos/asf/struts/struts2/branches/STRUTS_2_3_14_2_X@1488897 13f79535-47bb-0310-9956-ffa450edef68

xwork-core/src/main/java/com/opensymphony/xwork2/util/OgnlTextParser.java

@@ -11,17 +11,16 @@ public Object evaluate(char[] openChars, String expression, TextParseUtil.Parsed
         // deal with the "pure" expressions first!
         //expression = expression.trim();
         Object result = expression;
+        int pos = 0;
+
         for (char open : openChars) {
             int loopCount = 1;
-            int pos = 0;
-
             //this creates an implicit StringBuffer and shouldn't be used in the inner loop
             final String lookupChars = open + "{";
 
             while (true) {
                 int start = expression.indexOf(lookupChars, pos);
                 if (start == -1) {
-                    pos = 0;
                     loopCount++;
                     start = expression.indexOf(lookupChars);
                 }

xwork-core/src/test/java/com/opensymphony/xwork2/util/TextParseUtilTest.java

@@ -97,6 +97,24 @@ public void testTranslateVariables() {
         assertEquals("count must be between 123 and 456, current value is 98765.", s);
     }
 
+    public void testNestedExpression() throws Exception {
+        ValueStack stack = ActionContext.getContext().getValueStack();
+        stack.push(new HashMap<String, Object>() {{ put("foo", "${%{1+1}}"); }});
+        String s = TextParseUtil.translateVariables("${foo}", stack);
+        assertEquals("${%{1+1}}", s);
+        stack.pop();
+    }
+
+    public void testMixedOpenChars() throws Exception {
+        ValueStack stack = ActionContext.getContext().getValueStack();
+        stack.push(new HashMap<String, Object>() {{ put("foo", "bar"); }});
+        String s = TextParseUtil.translateVariables("${foo}-%{foo}", stack);
+        assertEquals("bar-bar", s);
+        s = TextParseUtil.translateVariables("%{foo}-${foo}", stack);
+        assertEquals("%{foo}-bar", s); // this is bad, but it is the only way not to double evaluate passed expression
+        stack.pop();
+    }
+
     public void testCommaDelimitedStringToSet() {
         assertEquals(0, TextParseUtil.commaDelimitedStringToSet("").size());
         assertEquals(new HashSet<String>(Arrays.asList("foo", "bar", "tee")),
@@ -132,10 +150,13 @@ public void testTranslateVariablesNoRecursive() {
 
     public void testTranslateVariablesRecursive() {
         ValueStack stack = ActionContext.getContext().getValueStack();
-        stack.push(new HashMap<String, Object>() {{ put("foo", "${1+1}"); }});
+        stack.push(new HashMap<String, Object>() {{ put("foo", "${1+1}"); put("bar", "${${1+2}}"); }});
 
         Object s = TextParseUtil.translateVariables('$', "foo: ${foo}", stack, String.class, null, 2);
         assertEquals("foo: 2", s);
+
+        s = TextParseUtil.translateVariables('$', "foo: ${bar}", stack, String.class, null, 1);
+        assertEquals("foo: ${${1+2}}", s);
     }
 
     public void testTranslateVariablesWithNull() {