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Re^8: Encoding/decoding question

by slugger415 (Beadle)
on Sep 12, 2011 at 21:46 UTC ( #925579=note: print w/ replies, xml ) Need Help??


in reply to Re^7: Encoding/decoding question
in thread Encoding/decoding question

Sorry to be dumb here, but where am I treating it as Latin-1? How do I change it? -- Scott


Comment on Re^8: Encoding/decoding question
Re^9: Encoding/decoding question
by tchrist (Pilgrim) on Sep 13, 2011 at 00:46 UTC
    I am processing some XHTML pages (using XML::Twig) that contain numerous character entities, such as:
    é
    Sorry to be dumb here, but where am I treating it as Latin-1? How do I change it?
    The problem is in your original XHTML file, because it has the literal 12‑byte ASCII sequence
    1. &
    2. #
    3. 1
    4. 9
    5. 5
    6. ;
    7. &
    8. #
    9. 1
    10. 6
    11. 9
    12. ;
    So something somewhere somewhen took a UTF‑8 file and replaced not each complete multibyte character with its single entity, but rather each individual component byte as the Latin‑1 code point number.

    This may have happened because some program read an undecoded binary byte stream and never decoded it before trying to convert non‑ASCII into numeric entities. For example, here I use -CS in the first process to say it’s UTF‑8 but then lie to the second one by using -C0 to say that it isn’t. That would produce the sort of thing that you saw:

    $ perl -CS -le 'print "na\x{EF}ivet\x{E9}"' naïveté $ perl -CS -le 'print "na\x{EF}ivet\x{E9}"' | perl -C0 -pe 's/(\P{ASCII})/"&#".ord($1).";"/ge' naïiveté $ perl -CS -le 'print "na\x{EF}ivet\x{E9}"' | perl -C0 -pe 's/(\P{ASCII})/sprintf "&#x%02X;", ord($1)/ge' naïiveté
    Compare with the right answers:
    $ perl -CS -le 'print "na\x{EF}vet\x{E9}"' | perl -CS -pe 's/(\P{ASCII})/"&#".ord($1).";"/ge' naïveté $ perl -CS -le 'print "na\x{EF}vet\x{E9}"' | perl -CS -pe 's/(\P{ASCII})/sprintf "&#x%02X;", ord($1)/ge' naïveté
    So what you really need to do is track down whatever errant procedure caused this mess in the first place, and fix that, since it will never work right that way.

    This demonstrates putting it back to UTF-8:

    $ perl -CS -le 'print "na\x{EF}vet\x{E9}"' | perl -C0 -pe 's/(\P{ASCII})/"&#".ord($1).";"/ge' | perl -C0 -pe 's/&#(\d+);/chr($1)/ge' naïveté
    And this, heaven help you, demonstrates doing that and then doing the entities the right way around in the first place:
    $ perl -CS -le 'print "na\x{EF}vet\x{E9}"' | perl -C0 -pe 's/(\P{ASCII})/"&#".ord($1).";"/ge' | perl -MEncode -C0 -pe 's/&#(\d+);/chr($1)/ge; $_ = decode_utf8($_, 1); s/(\P{ASCII})/"&#".ord($1).";"/ge' naïveté
    That means that if you were courageous enough, you could just do this:
    $ perl -i.unmangled.by.$$ -MEncode -C0 -pe 's/&#(\d+);/chr($1)/ge; $_ += decode_utf8($_, 1); s/(\P{ASCII})/"&#".ord($1).";"/ge' all*your*bro +ken*files.xhtml
    Here’s a version that runs from as a script instead of from the command line:
    #!/usr/bin/env perl use strict; use warnings; use Encode; die "gimme args" unless @ARGV; $^I = ".unmangled.by.$$"; while (<>) { s/&#(\d+);/chr($1)/ge; $_ = decode_utf8($_, 1); s/(\P{ASCII})/ "&#" . ord($1) . ";" /ge; print; }
    No warantees, though. Make sure you thoroughly understand all this before you further mangle your files.

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