[Swift-devel] [Bug 158] New: Tidy up backslash escape processing

[bugzilla-daemon at mcs.anl.gov]

http://bugzilla.mcs.anl.gov/swift/show_bug.cgi?id=158

           Summary: Tidy up backslash escape processing
           Product: Swift
           Version: unspecified
          Platform: Macintosh
        OS/Version: Mac OS
            Status: NEW
          Severity: normal
          Priority: P2
         Component: SwiftScript language
        AssignedTo: benc at hawaga.org.uk
        ReportedBy: wilde at mcs.anl.gov
                CC: benc at hawaga.org.uk


On Sat, 15 Nov 2008, Michael Wilde wrote:

> > It seems from experimentation that backslash quoting changed at some point (or
> > the user guide and tutorial are wrong): the \1 needed in the transform arg of
> > the regexp_mapper needs to be \\1 - at least it seems this way from
> > experimentation with trace().

Yes, that changed between v0.4 and v0.5.

This is an intended behaviour, to facilitate putting in \" characters.

> > Its also odd trace() takes \t and \n but echoes them just like that, with the
> > backslashes printing.

I don't think has had any strong intention about that should behave.

On looking at the parser, \ followed by one of n r t b f " \ will be 
passed through, with apparently only the quotes having some special 
behaviour and the others passing through unmodified. Other \ sequences, 
such as \g, will cause a parser error.

This could be tidied up sometime. File a bug for it.


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