[REBOL] Error handling
From: lmecir::mbox::vol::cz at: 3-Jul-2004 8:10
Hi all (esp. Gabriele),
I thought once more about error handling. It looks, that it may be
useful to be able to specify the error variable like below:
default: func [
{Execute code. If error occurs, execute fault.}
[throw]
code [block!] {Code to execute}
error [word!] {The error variable}
fault [block!] {Error handler}
] [
either error? set/any 'code try code [
do make function! reduce [[throw] error [error!]] fault code
] [get/any 'code]
]
comment [; Usage/tests:
ex1: function [[catch]] [r] [
set/any 'r throw-on-error a
do b
]
ex2: function [[catch]] [r] [
if none? set/any 'r attempt a [
throw make error! "error"
]
do b
]
ex3: function [[catch]] [r] [
set/any 'r default a 'error [throw error]
do b
]
a: [return "OK"]
b: ["KO"]
ex1
ex2
ex3
a: [()]
b: [if not value? 'r ["OK"]]
ex1
ex2
ex3
a: [none]
b: ["OK"]
ex1
ex2
ex3
]
