[JEXL-98] Quote escaping cannot be escaped

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0
• Fix Version/s: 2.0.1

Environment

All Java

• Assignee: Henri Biestro
• Reporter: Marcel Schoen
• Created: 11/Mar/10 14:03
• Updated: 07/Apr/10 14:40
• Resolved: 11/Mar/10 21:33

Description

I want to invoke a "replace" method which (pretty much like String.replace()) takes three String parameters:

function.replace(String text, String oldPart, String newPart)

If I invoke it to replace single backslash characters with double backslash characters (which is admittedly a VERY special use case), I invoke it in my unit test with an expression like this one:

function.replace('DOMAIN\somename', '
', '\\\\')

The result with JEXL 1.x was a string "DOMAIN
somename". But with JEXL 2, I get this error:

2010-03-11 14:50:59,681 [CC:] [RC:] [CN:] - [SYSTEM] [INVALID_EXPR] Invalid expression in configuration. Expression: 'function.replace('DOMAIN\myname', '
', '\\\\') / Exception: org.apache.commons.jexl2.JexlException: com.usp.sls.toolkit.expression.impl.Jexl2Provider.getScript@441tokenization failed'
org.apache.commons.jexl2.JexlException: com.usp.sls.toolkit.expression.impl.Jexl2Provider.getScript@441tokenization failed
at org.apache.commons.jexl2.JexlEngine.parse(JexlEngine.java:816)
at org.apache.commons.jexl2.JexlEngine.createScript(JexlEngine.java:414)
at org.apache.commons.jexl2.JexlEngine.createScript(JexlEngine.java:397)
at com.usp.sls.toolkit.expression.impl.Jexl2Provider.getScript(Jexl2Provider.java:441)
at com.usp.sls.toolkit.expression.impl.Jexl2Provider.evaluateExpression(Jexl2Provider.java:152)
at com.usp.sls.toolkit.expression.Expression.evaluateExpression(Expression.java:201)
at com.usp.sls.toolkit.expression.JexlTest.testReplace(JexlTest.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at junit.framework.TestCase.runTest(TestCase.java:164)
at junit.framework.TestCase.runBare(TestCase.java:130)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:120)
at junit.framework.TestSuite.runTest(TestSuite.java:228)
at junit.framework.TestSuite.run(TestSuite.java:223)
at org.junit.internal.runners.OldTestClassRunner.run(OldTestClassRunner.java:35)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.apache.commons.jexl2.parser.TokenMgrError: Lexical error at line 1, column 42. Encountered: "
" (92), after : ""
at org.apache.commons.jexl2.parser.ParserTokenManager.getNextToken(ParserTokenManager.java:1564)
at org.apache.commons.jexl2.parser.Parser.jj_scan_token(Parser.java:3914)
at org.apache.commons.jexl2.parser.Parser.jj_3R_118(Parser.java:2776)
at org.apache.commons.jexl2.parser.Parser.jj_3R_111(Parser.java:2759)

Obviously, the JEXL parser thinks that the backslash in the first string is meant to escape the following quote, which it isn't. The String should actually end there. So, I tried to escape the escape character, like this:

function.replace('DOMAIN\somename', '\\\\', '\\\\\\\\')

But to no avail, same error.

So, can escape characters be escaped in JEXL 2?