On Sat, Feb 9, 2013 at 1:43 PM, Alan Manuel Gloria <[email protected]> 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
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