Re: Exception Handling in LISP.

Re: Exception Handling in LISP.

[Bruce Park]

>From: kai.grossjohann@gmx.net (Kai Großjohann)
>To: help-gnu-emacs@gnu.org
>Subject: Re: Exception Handling in LISP.
>Date: Fri, 25 Apr 2003 19:06:48 +0200
>
>"Bruce Park" <bpark79@hotmail.com> writes:
>
> > Remember, LISP falls into logic programming.
>
>One could say that Lisp is a functional language, but it's surely not
>a logic programming language.
Oops. I meant to say functional. I was thinking of Prolog and not LISP. 
Sorry for the confusion.
>
>(There are two views on functional programming: one view requires
>some features to be present (functions as first-class objects, ...),
>and the other additionally forbids other features from being present
>(assignments, ...).  Lisp is a functional language only according to
>the former.)
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Re: Exception Handling in LISP.

[Jesper Harder]

"Bruce Park" <bpark79@hotmail.com> writes:

> Last time I checked, exception handling is NOT a part of LISP.

It must have been a long time since you checked :-) The ancient Lisps of
the 60s (Lisp 1.5 etc) didn't have built-in exception handling.

But Lisp (including Emacs Lisp and Common Lisp) has had exception
handling for a long time.

The OP might want to check Kent Pitman's paper "Exceptional Situations
In Lisp" for a discussion of exception handling in Common Lisp:

<http://www.nhplace.com/kent/Papers/Exceptional-Situations-1990.html>

> Remember, LISP falls into logic programming.

It doesn't.

Re: Exception Handling in LISP.

[Kai Großjohann]

"Bruce Park" <bpark79@hotmail.com> writes:

> Remember, LISP falls into logic programming.

One could say that Lisp is a functional language, but it's surely not
a logic programming language.

(There are two views on functional programming: one view requires
some features to be present (functions as first-class objects, ...),
and the other additionally forbids other features from being present
(assignments, ...).  Lisp is a functional language only according to
the former.)
-- 
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Re: Exception Handling in LISP.

[Bruce Park]

>From: Gurucharan <gurucharan.murudeshwar@wipro.com>
>To: "'help-gnu-emacs@gnu.org'" <help-gnu-emacs@gnu.org>
>Subject: Exception Handling in LISP.
>Date: Fri, 25 Apr 2003 17:57:37 +0530
>
>Hi All,
>         Can we catch any unknown exception in Lisp like C++ ?
>
>That is, like the C++ ... (Epsilon code).
>can we catch any exception irrespective of which
>exception was thrown ?
>
>Example:
>try {
>      // Something ....
>}
>catch (...) {    // Do something after Exception has occurred ...
>                 }
>
>Any material/links on Exception Handling in LISP
>is welcome.
Last time I checked, exception handling is NOT a part of LISP. Remember, 
LISP falls into logic programming.
>
>Thanks.
>
>Kind Regards,
>             gurucharan
>
>
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Problem positioning cursor

[Victor Kirk]

Hi,

I've wrote a function to insert a skeleton for a java try-catch
block, but I've run into a problem leaving the cursor in the
correct place.

If there is no active region I want the following code to be
inserted (note X marks the spot I want to leave the cursor at.

    try {
        X
    } catch(Exception e) {
        e.printStackTrace();
    } 

This works fine.

If there is code selected I want:

    try {
        someCode(toBeWrapped);
    } catch(Exception e) {
        e.printStackTrace();
        X
    } 

unfortunatly the cursor is left at the `n' in Exception.

If anyone has the time to point me in the right direction
it would be appreciated.


(defun vics-java-catch-insert(&optional has-finally)
  "Generate a skeleton for a java try-catch block. If the optional
has-finally is true then a finally block is also inserted."
  (interactive)
  (let ((ex-type (read-from-minibuffer "Exception Type: " "Exception" nil
nil nil nil nil))
		(try-start)    ;; start of try catch block
		(try-end)      ;; end of 
		(try-body nil) ;; code to insert within try/catch
		(edit-point))  ;; point to leave user at
	;; If a region is selected save this to try-body
	(if (c-region-is-active-p)
		(setq try-body (delete-and-extract-region (mark) (point))))
	(setq try-start (point))
	(insert "try {\n")
	(if (not try-body)
		(setq edit-point (point))
	  (insert try-body))
	(insert (format "\n} catch (%s e) {\n" ex-type))
	(insert "e.printStackTrace();\n")
	;; if we had some text leave save location at the end of the catch
	;; block
	(if (eq nil (not try-body))
		(setq edit-point (point)))
	(insert "}")	;
	(if (eq nil (not has-finally))
		(insert " finally {\n\n}"))
	(setq try-end (point))
	(indent-region try-start try-end nil)
	(goto-char edit-point)
	(c-indent-command)))



Vic
--
Victor Kirk
Analyst
Serco Integrated Transport
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Exception Handling in LISP.

[Gurucharan]

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Hi All,
        Can we catch any unknown exception in Lisp like C++ ?

That is, like the C++ ... (Epsilon code).
can we catch any exception irrespective of which
exception was thrown ?

Example:
try {
     // Something ....
}
catch (...) {    // Do something after Exception has occurred ...
                }

Any material/links on Exception Handling in LISP
is welcome.

Thanks.

Kind Regards,
            gurucharan



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Re: Exception Handling in LISP.

[David Kastrup]

Gurucharan <gurucharan.murudeshwar@wipro.com> writes:

> Hi All,
>         Can we catch any unknown exception in Lisp like C++ ?
> 
> That is, like the C++ ... (Epsilon code).
> can we catch any exception irrespective of which
> exception was thrown ?
> 
> Example:
> try {
>      // Something ....
> }
> catch (...) {    // Do something after Exception has occurred ...
>                 }
> 
> Any material/links on Exception Handling in LISP
> is welcome.

Take a look at catch, throw, condition-case and unwind-protect in the
Elisp manual.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

Re: Exception Handling in LISP.

[Kai Großjohann]

Gurucharan <gurucharan.murudeshwar@wipro.com> writes:

> Can we catch any unknown exception in Lisp like C++ ?

Emacs Lisp has throw/catch and signal/condition-case.  I guess
signal/condition-case is more like what you want, since errors are a
special kind of signal.

Both provide ways to just `catch everything'.
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