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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 32530] New: - Expressions with conditionals and unprefixed functions do not alway parse
Date Sat, 04 Dec 2004 13:38:40 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=32530

           Summary: Expressions with conditionals and unprefixed functions
                    do not alway parse
           Product: Commons
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: major
          Priority: P2
         Component: EL
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: backhous@us.ibm.com


If you take a el expression of the form :

${true ? a : reverse("Foo")}

The commons el parser will fail to parse this.
The ambiguity between the Conditional rule and the Function rule (both using ":"
as a token) seems to cause the parser problems.

Here is a jsp that can be used to easily verify this :

<%@page contentType="text/html"%>
<html>
<body>
<%
String expr = "${true ? a : reverse(\"Foo\")}";
try {
   pageContext.getExpressionEvaluator().parseExpression(expr,
                                                        java.lang.String.class,   
                                                        null);
   out.println("Parsed " + expr);
}
catch (javax.servlet.jsp.el.ELException e) {
   out.println("Failed to parsed "+ expr + " : " + e.getMessage());
}
%>
</body>
</html>

Just by adding a prefix to the function or changing the true condition to
something other than a value will make it parse.

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