[erlang-questions] utf-8 and xmerl

[Alexander Turkin]

Hi Éric,

my Erlang is R16B03

On 14 August 2015 at 17:23, Éric Pailleau <eric.pailleau@REDACTED> wrote:

> Hello,
> Please precise what Erlang release you are using. Utf8 came lately in
> Erlang.
> Regards
>
> Le 14 août 2015 13:49, Alexander Turkin <snowwlex@REDACTED> a écrit :
> >
> > Dear list,
> >
> >
> > I've got a problem with unicode & xmerl library.
> >
> > Input data for xmerl is utf-8 encoded xml, and what I've got as the
> result is encoded latin1. But I need utf8!
> >
> >
> > EXAMPLES
> >
> > Body = <<"<?xml version=\"1.0\"
> encoding=\"UTF-8\"?><response><value>René</value></response>"/utf8>>.
> >
> > (for the sake of portability here is term_to_binary(Body):
> >
> > <<131,109,0,0,0,79,60,63,120,109,108,32,118,101,114,115,
> >   105,111,110,61,34,49,46,48,34,32,101,110,99,111,100,105,
> >   110,103,61,34,85,84,70,45,56,34,63,62,60,114,101,115,
> >   112,111,110,115,101,62,60,118,97,108,117,101,62,82,101,
> >   110,195,169,60,47,118,97,108,117,101,62,60,47,114,101,
> >   115,112,111,110,115,101,62>>
> >
> >
> >
> > (1):
> >
> > When I do
> >
> > xmerl_scan:string(binary_to_list(Body)).
> >
> > it returns
> >
> > {#xmlElement{name = response,expanded_name = response,
> >              nsinfo = [],
> >              namespace = #xmlNamespace{default = [],nodes = []},
> >              parents = [],pos = 1,attributes = [],
> >              content = [#xmlElement{name = value,expanded_name = value,
> >                                     nsinfo = [],
> >                                     namespace = #xmlNamespace{default =
> [],nodes = []},
> >                                     parents = [{response,1}],
> >                                     pos = 1,attributes = [],
> >                                     content = [#xmlText{parents =
> [{value,1},{response,1}],
> >                                                         pos = 1,language
> = [],
> >
> >
> >                                                         value = "René",
> >
> >
> >                                                         type = text}],
> >                                     language = [],xmlbase =
> "/Users/aturkin/ws/",
> >                                     elementdef = undeclared}],
> >              language = [],xmlbase = "/Users/aturkin/ws/",
> >              elementdef = undeclared},
> >  []}
> >
> >
> > So, note there is `value = "René"` string, and it uses [233] symbol,
> which is latin1.
> >
> >
> >
> >
> > (2):
> >
> > xmerl_scan:string(xmerl_ucs:to_utf8(binary_to_list(Body)))
> >
> > returns
> >
> > {#xmlElement{name = response,expanded_name = response,
> >              nsinfo = [],
> >              namespace = #xmlNamespace{default = [],nodes = []},
> >              parents = [],pos = 1,attributes = [],
> >              content = [#xmlElement{name = value,expanded_name = value,
> >                                     nsinfo = [],
> >                                     namespace = #xmlNamespace{default =
> [],nodes = []},
> >                                     parents = [{response,1}],
> >                                     pos = 1,attributes = [],
> >                                     content = [#xmlText{parents =
> [{value,1},{response,1}],
> >                                                         pos = 1,language
> = [],
> >
> >
> >                                                         value = "René",
> >
> >
> >                                                         type = text}],
> >                                     language = [],xmlbase =
> "/Users/aturkin/ws/",
> >                                     elementdef = undeclared}],
> >              language = [],xmlbase = "/Users/aturkin/ws/",
> >              elementdef = undeclared},
> >  []}
> >
> > Now `value = "René"`, so 2 bytes are used to code this symbol, and this
> is utf-8.
> >
> > So in (2) I get what I need, but why I need to force that conversion for
> xmerl?
> >
> >
> >
> >
> > QUESTIONS
> >
> > 1. I don't understand why xmerl_scan allows you to set input encoding,
> but it looks like there is no way to set output encoding. Is there any way
> to make xmerl_scan to return utf8 instead of latin1?
> >
> > 2. How is that happen, that in (1) it does conversion utf-8 -> latin1,
> and in (2) it's utf-8?
> >
> >
> >
> >
> > --
> > Best Regards,
> > Alex Turkin
>



-- 
Best Regards,
Alex Turkin
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