3 Sep
2014
3 Sep
'14
5:23 p.m.
Ok, I ended up with this solution:
isStartOfLine
(position = 0) ifTrue: [ ^ true ].
self insideCRLF ifTrue: [ ^ false ].
^ (self peekBack = Character cr) or: [ self peekBack = Character lf].
The question that remains is, how to handle a situation when CR/LF/CRLF is
at the end of the stream. Is it still a new line?
Cheers,
Jan
On 3 September 2014 15:52, Tudor Girba <tudor(a)tudorgirba.com> wrote:
I think this is not enough, because when you have
cr+lf, you do not want
to be true on cr. I think we should go with the the same rule as in the
parser I proposed, which means that we need to reason about two characters.
Doru
On Wed, Sep 3, 2014 at 3:38 PM, Jan Kurš <kurs.jan(a)gmail.com> wrote:
@Doru: This might solve the problem:
isStartOfLine
(position = 0) ifTrue: [ ^ true ].
^ ((collection at: position) = Character cr) or: [ (collection
at: position) = Character lf ].
Do you agree?
Cheers,
Jan
On 3 September 2014 14:46, Tudor Girba <tudor(a)tudorgirba.com> wrote:
--
www.tudorgirba.com
"Every thing has its own flow"
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Hi,
Jan has implemented a nice parser that allows us to specify easily
productions that depend on text having to be on a new line.
For example, in Pillar, a header is specified through an exclamation
mark starting on a new line. Now, you can parse this as:
#startOfLine asParser , $! asParser , #newline asParser negate star
Pretty cool!
@Jan: I think we need to enhance a bit the implementation. The
implementation looks like this right now:
isStartOfLine
(position = 0) ifTrue: [ ^ true ].
^ (collection at: position) = Character cr.
This will work when the line ending is either cr or lf+cr. However, it
won't work if the line ending is just lf.
For example, in my parsers, the newline implementation looks like:
(#cr asParser , #lf asParser optional) / #lf asParser / #cr asParser
What do you think?
Cheers,
Doru
--
www.tudorgirba.com
"Every thing has its own flow"
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