Mangled String?

[Grégory Vanuxem]

Hello,

I am stuck with a String issue that I do not understand, maybe you can understand it. Basically, I have a small interface (package) to BrowserInformation and the String returned by the following function is apparently mangled. That does not happen for every operations. I attached the Spad file for testing purpose.

    getOperationDocumentation(op) ==

      ops := search_operations(string op)$BrowserInformation

      docs := coerce(ops)@List(Record(name: Symbol,

        sdl: List(Record(signature: SExpression,

          condition: SExpression, origin: SExpression,

            documentation: String))))

      res_str : String := ""

      for ops_rec in docs repeat

        for item in elt(ops_rec, sdl) repeat

          cleaned := clean_tex(elt(item, documentation))

          sl := cons(convert('Mapping)$SExpression,

            destruct(elt(item, signature)))

          sig_str : String := concat [" Signature: ",

            form2LispString(sl)$Lisp pretend String]

          ori_str : String := concat [" From: ",

            form2LispString(elt(item, origin))$Lisp pretend String]

          -- Debug purpose

          PRINT(concat [cleaned, coerce(newline()),

            sig_str, coerce(newline()), ori_str, coerce(newline()), coerce(newline())])$Lisp

          res_str := concat [res_str, cleaned, coerce(newline()),

            sig_str, coerce(newline()), ori_str, coerce(newline()), coerce(newline())]

      res_str

The PRINT$Lisp is here for debug. As an example, here is the output when I apply it to the debug function:

===========================================================================

(3) -> getOperationDocumentation(debug)

"debug(d) specifies whether we want additional output on the progress. This option is expressed in the form debug == d.
 Signature: (Boolean)->%
 From: GuessOption

"
"debug(true) turns debug mode on debug(false) turns debug mode off
 Signature: (Boolean)->Boolean
 From: Plot

"
"debug returns whether we want additional output on the progress, default being false
 Signature: (List(GuessOption))->Boolean
 From: GuessOptionFunctions0

"
   (3)
  "debug(d) specifies whether we want additional output on the progress. This o
  ption is expressed in the form debug == d.
 Signature: (Boolean)->%
 From: Gu
  essOption

debug(true) turns debug mode on debug(false) turns debug mode off

   Signature: (Boolean)->Boolean
 From: Plot

debug returns whether we want add
  itional output on the progress, default being false
 Signature: (List(GuessOp
  tion))->Boolean
 From: GuessOptionFunctions0

"
                                                                 Type: String

==================================================================

The first part is the PRINT debug information, but after the (3), in the string returned I obtain some _apparently_ random space characters or carriage return.

For example, see the first "From:", the GuessOption is mangled. In the third part this is in the "Signature:". In fact, that can happen in the docstring also. Any idea why? And eventually a hack to circumvent this?

Hoping I am clear.

Greg

[Qian Yun]

OK, this is a side effect of

)set output length


Even if your string contains "\n", fricas considers it as
one long string, and cuts it up when exceeding the above limit.

- Qian

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[Grégory Vanuxem]

Oh thanks Qian!

In fact I usually use a line length of 110, I reverted it to 77 to see the change, I did not notice this.

Since this interface is not only designated to be used in the interpreter, but also for use by the MCP server I am coding, I suppose I will have to play with $LINELENGTH related code and 'pile' also a List of OutputForm in another routine.

Good!

BTW, I am pretty sure the Waldek's code for HyperDoc can do better than some part I did but I must admit, its code is beyond my actual knowledge.

Greg

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