flexichain-devel October 2006

flexichain-devel@common-lisp.net

2 participants
2 discussions

[flexichain-devel] A couple of flexichain questions
by Brad Beveridge 25 Oct '06

25 Oct '06

I recently put an editor project on common-lisp.net (http://common-lisp.net/project/vial/). Troels contacted me and rightly asked why I didn't use Flexichain to implement my buffer (I use a linked list of strings basically). I've thought about the two methods (gap buffer vs linked list of lines), and basically the performance for either method is probably about the same for most operations. The one big place that a gapbuffer wins is when you want to treat a large section of the buffer as a read-only string. For a list of lines you need to cons up a new string, for a gap buffer (assuming it is locked), you simply need to move the gap and take a pointer into the gap buffer. I envision using this "large string" mode of the gap buffer for: - searching one huge string with CL-PPCRE - saving the buffer in one call So after all my rambling I have two questions: 1) Is it appropriate to use Flexichain in this "one large string" manner? Obviously you don't want to always convert to this form, but it is handy for running a search on the buffer and some other uses. 2) What is involved in creating a function that consolidates the data into a contiguous chunk that is suitable for creating a displaced array into? Thanks Brad

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[flexichain-devel] patches for weak pointers
by Robert Strandh 17 Oct '06

17 Oct '06

Hello, I just realized I was not on the Flexichain mailing list, which is why I haven't applied the patches. Better late than never, I guess. Thanks again! -- Robert Strandh --------------------------------------------------------------------- Greenspun's Tenth Rule of Programming: any sufficiently complicated C or Fortran program contains an ad hoc informally-specified bug-ridden slow implementation of half of Common Lisp. ---------------------------------------------------------------------

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flexichain-devel October 2006