Re: calc-embedded-activate

[Jay Belanger]

Jay Belanger <belanger@truman.edu> writes:
...
> The problem is, if the match is := or => then the parenthesized
> expression wasn't matched, and so (match-end 1) returns nil.
> The crucial loop begins at line 343 in calc-embed.el, and looks like
>   (while (re-search-forward pat nil t)
>     (if (looking-at calc-embedded-open-formula)
>         (goto-char (match-end 1)))
>     (setq info (calc-embedded-make-info (point) cbuf nil))
>     (or (eq (car-safe (aref info 8)) 'error)
>         (goto-char (aref info 5))))
> I don't see what the 
>     (if (looking-at calc-embedded-open-formula)
>         (goto-char (match-end 1)))
> is doing there at all.  If the parenthesized part of the pattern is
> matched, then (match-end 1) will be the point and nothing happens, if
> the parenthesized part is not matched, this gives an error.

Okay, I was stupid here.  The `looking-at' will give new `match-end'
data.  (Although calc-embedded-open-formula doesn't have any
parenthesized expressions, so the (goto-char (match-end 1)) still
gives the error.  And I still don't see what the `if' is doing there.)

Jay