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From: bugzilla@apache.org
To: dev@tomcat.apache.org
Subject: DO NOT REPLY [Bug 52335] New: Tomcat escapes all the \% in Template
 Text as %.
Date: Thu, 15 Dec 2011 00:35:51 +0000
Message-ID: <bug-52335-78@https.issues.apache.org/bugzilla/>
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https://issues.apache.org/bugzilla/show_bug.cgi?id=3D52335

             Bug #: 52335
           Summary: Tomcat escapes all the \% in Template Text as %.
           Product: Tomcat 5
           Version: 5.5.34
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Jasper
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: zhanglili@cn.fujitsu.com
    Classification: Unclassified


hi,

I noticed that there is a problem at the % escape on Tomcat 5.5.34.

(1)The problem
    The JSP Specification 2.0 says:
    ------
    JSP.1.6 Quoting and Escape Conventions
    =E2=86=92 Quoting in Template Text
     =E3=80=80=E3=83=BBA literal <% is quoted by <\%
    ------

    But the result of the % escape on Tomcat 5.5.34 is :
    ------
    Not only the \% of <\% is escaped as %.
    All the \% in Template Text is escaped as %.
    ------

    If I want to show \% on the HTML page, it is needed to write \\% in a J=
SP
file.

    The problem  also occurs on Tomcat 5.5.23 or Tomcat7.0.8.
    And it seems that the problem has already occured on Tomcat 5.5.0.

(2)The reason
    The reason of the problem is that the following method is not implement=
ed
    according to JSP Specification.
         =E3=83=BBThe class:
                org.apache.jasper.compiler.Parser
         =E3=83=BBThe method:
               void parseTemplateText(Node parent)
         =E3=83=BBThe part of source:
           ------
           else if (ch =3D=3D '\\') {
                if (!reader.hasMoreInput()) {
                    ttext.write('\\');
                    break;
                }
                // Look for \% or \$
                // Only recognize \$ if isELIgnored is false
                char next =3D (char)reader.peekChar();
                if (next =3D=3D '%' || (next =3D=3D '$' && !pageInfo.isELIg=
nored())) {
=E2=96=B2
                    ch =3D reader.nextChar();
                }
            }
           ------

Is it a bug?

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