Attached find a simple implementation (which does *not* handle comments, blank lines, and ":").
I've also pushed it on the git repo.
On Sat, Feb 9, 2013 at 4:59 PM, Alan Manuel Gloria <almkg...@gmail.com> wrote:
> On Sat, Feb 9, 2013 at 1:43 PM, Alan Manuel Gloria <almkg...@gmail.com> wrote:
>> - at the start of the read, the "previous line's indent" is considered
>> as negative.
>> - A line with the same indent as the previous line inserts a ")". It
>> also inserts a "(" unless the line starts with "."
>> - a line with a greater indent than the previous line inserts a "("
>> unless the line starts with "."
>> - a line with a lesser indent than the previous line inserts a ")" for
>> each indentation level popped, followed by a closing ")"
>> - "." at the start of the line is removed.
>>
>
> Scratch that. Here's a better implementation, based on what I see as
> the core stuff you want.
>
> This ruleset bans a more indented line after a "."-initial line. None
> of your examples shows that case, and I think that the simplistic
> approach I'm using is hard to hack a decent effect with it. I also
> ignore ":", because I'm not sure if its effect crosses line boundaries
> (and if it does, how you're supposed to handle double-width CJK
> characters.)
>
> - the reader has two variables: a stack of indentation levels, and a
> boolean dot flag. Initially the stack contains a single negative
> item, and the dot flag is false.
> - When the current line is more indented than the stack top:
> - - if the dot flag is set, error!!
> - - if it starts with ".", just set the dot flag
> - - otherwise insert a "(" and clear the dot flag and push the new
> indent on the stack.
> - When the current line is at the same indent as the stack top:
> - - if the dot flag is cleared, insert ")".
> - - if it starts with ".", just set the dot flag
> - - otherwise insert a "(" and clear the dot flag
> - Otherwise:
> - - if the dot flag is cleared, insert ")"
> - - pop off stack items until we reach an indent with the exact same
> indent as the current line; emit ")" for each popped item (warning:
> off-by-one error might be here, so need to actually check by
> implementing)
> - - if it starts with "." just set the dot flag
> - - otherwise insert a "(" and clear the dot flag
>
> nb: blank lines might cause (), need to consider those.
> nb: also, see the warning above, need to actually check it.
>
> Hope this helps. If you can get an implementation (even just a simple
> one that does a text-to-text substitution, and without ":", like the
> above) show us so we can think about it more.
>
> Sincerely,
> AmkG
arne-formulation.scm
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sample.arne
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