[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
generating SXML trees in guile
From: |
Matt Wette |
Subject: |
generating SXML trees in guile |
Date: |
Sat, 9 Jan 2021 15:50:56 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 |
This is a FYI, not saying this is a bug.
I'm digging into the sxml xpath procedures and came across a potential
issue with using sxml in Guile.
I believe I remember that Oleg's SXML code relies on the fact that no
nodes a sxml tree are eq?. For example, in the SXML tree
(define sx1 '(*TOP* (a "1") (a "1)))
node-parent in (sxml xpath) depends on the fact that
(eq? (list-ref sx1 1) (list-ref sx1 2)
=>
#f
But the result, in Guile 3.0.4, is
#t
I'm guessing this is cse optimization at work. I tried this also:
(let* ((sx2 '())
(sx2 (cons '(a "1") sx2))
(sx2 (cons '(a "1") sx2))
(sx2 (cons '*TOP* sx2)))
(eq? (list-ref sx2 1) (list-ref sx2 2)))
=>
#t
In my sandbox, I'm using copy-tree which seems to be changing
the #t to #f, so at least that works.
Matt
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- generating SXML trees in guile,
Matt Wette <=