Multi-line comments in Erlang

Zvi <>
Thu Dec 9 18:50:45 CET 2010


I think Python using '#' for comments.

On Dec 9, 5:58 pm, Daniel Goertzen <> wrote:
> Thank you for reminding me about HEREDOCs.  In Python, I often use triple
> quoted strings for multiline comments.  It works well, but they are exposed
> to the interpreter which smells a bit.  What if erlang had HEREDOCs *plus* a
> way to mark any string as a comment.  Some illustrations, using Python's
> triple quoting as HEREDOC format.
>
> X="""
> This is
> a multiline heredoc
> """,
> ...
>
> %"""
> This is
> a multiline comment
> """
>
> myfun(X, Y %"An inline comment", Z) -> ...
>
> So comment and string delimiting uses the exact same logic, but you stick a
> % in front to mark it as a comment instead of a string.
>
> Dan.
>
> On Thu, Dec 9, 2010 at 3:48 AM, Zvi . <> wrote:
> > 1. The beauty of dynamic languages is that you don't need tools and IDEs!
> > And even if you do use tools, many times you work not on your machine or on
> > target headless environments, with only basic editor available, or with
> > editor that you know poorly or which didn't configured with your macros,
> > etc.
>
> > 2. Comments are essentially Natural language (let's say US English)
> > document, embedded into Programming language (Erlang) document.
> > Therefore, embedded document should be left intact. Ideally I would like
> > comments to be something, like HEREDOC.
>
> > 3. Free format is the king! Language designers shouldn't dictate
> > programmers
> > how to format and ident their code.
> > How differnt is starting comment line from '%' in Erlang, from putting 'C'
> > or '*' in the first column in FORTRAN?
>
> > 4. In other languages, that doesn't have multiline comments I often use
> > ifdef(false) macro, or outright if(false) to "comment out" parts of code. I
> > think it's uglier, than proper multiline comments, but still better than
> > comment every single line.
>
> > Zvi
>
> > On Tue, Dec 7, 2010 at 8:20 PM, Rapsey <> wrote:
>
> > > Is it that important? Any proper programming editor can comment/uncomment
> > > multiple lines.
>
> > > Sergej
>
> > > On Tue, Dec 7, 2010 at 5:49 PM, Zvi . <> wrote:
>
> > >> Why do you think it's not possible?
> > >> It's just simple change to Erlang source code parser.
> > >> Probably this should be submitted as EEP, so OTP team will consider it.
>
> > >> On Tue, Dec 7, 2010 at 6:25 PM, James Churchman <
> > 
> > >> >wrote:
>
> > >> > not posible in erlang, but many editors (eg i use textmate) will
> > comment
> > >> > and uncomment multiple lines with % on each line..
> > >> > On 7 Dec 2010, at 15:32, Zvi wrote:
>
> > >> > > Hi,
>
> > >> > > Matlab/Octave has single line comments, like Erlang (i.e. starting
> > >> > > with '%' sign). But it also have multi-line comments, like for
> > >> > > example:
>
> > >> > > %{
> > >> > > this is example
> > >> > > of multi-line
> > >> > > comments in Matlab
> > >> > > %}
>
> > >> > > which is equivalent to:
>
> > >> > > %this is example
> > >> > > %of multi-line
> > >> > > %comments in Matlab
>
> > >> > > How difficult is to add comments like this to Erlang?
>
> > >> > > Thanks,
> > >> > > Zvi
>
> > >> > > ________________________________________________________________
> > >> > > erlang-questions (at) erlang.org mailing list.
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>


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