93 lines
2.7 KiB
Factor
93 lines
2.7 KiB
Factor
|
!:folding=indent:collapseFolds=1:
|
||
|
|
||
|
! $Id$
|
||
|
!
|
||
|
! Copyright (C) 2004 Slava Pestov.
|
||
|
!
|
||
|
! Redistribution and use in source and binary forms, with or without
|
||
|
! modification, are permitted provided that the following conditions are met:
|
||
|
!
|
||
|
! 1. Redistributions of source code must retain the above copyright notice,
|
||
|
! this list of conditions and the following disclaimer.
|
||
|
!
|
||
|
! 2. Redistributions in binary form must reproduce the above copyright notice,
|
||
|
! this list of conditions and the following disclaimer in the documentation
|
||
|
! and/or other materials provided with the distribution.
|
||
|
!
|
||
|
! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
||
|
! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
||
|
! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||
|
! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||
|
! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||
|
! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
||
|
! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
||
|
! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
||
|
! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
||
|
! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
||
|
IN: errors
|
||
|
USE: arithmetic
|
||
|
USE: continuations
|
||
|
USE: inspector
|
||
|
USE: lists
|
||
|
USE: stack
|
||
|
USE: stdio
|
||
|
USE: strings
|
||
|
USE: unparser
|
||
|
|
||
|
! This is a very lightweight exception handling system.
|
||
|
|
||
|
! catch stack
|
||
|
! error? --> top of catch stack, save error continuation,
|
||
|
! restore the continuation there
|
||
|
! restore continuation of 'catch' so that the catch is not in
|
||
|
! scope -- it can throw up.
|
||
|
! if top level catches error, it prints a message.
|
||
|
!
|
||
|
! The kernel throws errors as lists. The first element is an
|
||
|
! integer.
|
||
|
|
||
|
: kernel-error? ( obj -- ? )
|
||
|
dup cons? [ car fixnum? ] [ drop f ] ifte ;
|
||
|
|
||
|
: ?nth ( n list -- obj )
|
||
|
dup >r length min 0 max r> nth ;
|
||
|
|
||
|
: error# ( n -- str )
|
||
|
[
|
||
|
"Handle expired"
|
||
|
"Undefined word"
|
||
|
"Type check"
|
||
|
"Array range check"
|
||
|
"Underflow"
|
||
|
] ?nth ;
|
||
|
|
||
|
: kernel-error% ( error -- )
|
||
|
car error# % ": " % unparse % ;
|
||
|
|
||
|
: error>str ( error -- str )
|
||
|
dup kernel-error? [
|
||
|
<% kernel-error% %>
|
||
|
] [
|
||
|
unparse
|
||
|
] ifte ;
|
||
|
|
||
|
: default-error-handler ( error -- )
|
||
|
#! Print the error and return to the top level.
|
||
|
"Uncaught exception." print
|
||
|
"-------------------" print
|
||
|
"Datastack:" print
|
||
|
.s
|
||
|
"Callstack:" print
|
||
|
.r
|
||
|
"Namestack:" print
|
||
|
.n
|
||
|
terpri
|
||
|
"ERROR: " write error>str print
|
||
|
suspend ;
|
||
|
|
||
|
: throw ( error -- )
|
||
|
#! Throw an error. If no catch handlers are installed, the
|
||
|
#! default-error-handler is called.
|
||
|
default-error-handler ;
|