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https://issues.apache.org/jira/browse/VELOCITY-587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12567831#action_12567831
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Jon Seymour commented on VELOCITY-587:
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Etienne, thanks for pointing out the use of single quotes - I should have read
the doco better. If I had had my shell-script hat on this would have occurred
to me but since I didn't have the VTL reference handy when I was struggling
with this issue, I had incorrectly assumed that '\' would be treated as a Java
character reference.
Nathan: I guess it doesn't really surprise me that #set($foo="\") is a parsing
error, if \'s are meant to be treated as escape characters when parsing
strings. More surprising was the failure of #set($foo="\.") since based on
other experiments I expected the \ to be preserved.
It would be good to have some clarity on what \ is meant to do in double quoted
strings since I don't think (but I may be wrong) this is specified clearly
anywhere.
Perhaps it would be useful to include a section about the behaviour of
backslashes in double quoted strings in the user's guide?
jon.
> Backslashes throw lexical errors in double-quoted strings
> ---------------------------------------------------------
>
> Key: VELOCITY-587
> URL: https://issues.apache.org/jira/browse/VELOCITY-587
> Project: Velocity
> Issue Type: Bug
> Affects Versions: 1.6
> Reporter: Jon Seymour
> Priority: Minor
> Fix For: 1.6
>
>
> The VTL doesn't currently provide a way to express strings containing a
> single backslash (\)
> #set($backslash="\")
> results in a lexical error during template parsing.
> #set($backslash="\\")
> results in $backslash being assigned a string containing two backslashes (\\)
> It appears the only workaround available now is to construct a variable
> containing just a single backslash with this idiom:
> #set($twobackslashes="\\")
> #set($backslash=$twobackslashes.substring(0,1))
> Even if this can't be fixed in the parser, the documentation should be
> updated to define a preferred idiom for obtaining a string containing a
> single backslash.
> jon.
> note: this issue partially duplicates a comment by Guido Deinhammer on issue
> #454 regarding other escaping issues. I have raised a separate issue, so that
> this one can be addressed separately, if desired.
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