! :folding=indent:collapseFolds=1:

! $Id$
!
! Copyright (C) 2004 Slava Pestov.
! 
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IN: errors
USE: arithmetic
USE: combinators
USE: continuations
USE: kernel
USE: lists
USE: logic
USE: namespaces
USE: prettyprint
USE: stack
USE: stdio
USE: strings
USE: unparser
USE: vectors

: kernel-error? ( obj -- ? )
    dup cons? [ car fixnum? ] [ drop f ] ifte ;

: ?vector-nth ( n vec -- obj )
    over [
        dup >r vector-length min 0 max r> vector-nth
    ] [
        2drop f
    ] ifte ;

: error# ( n -- str )
    {
        "Expired port: "
        "Undefined word: "
        "Type check: "
        "Array range check: "
        "Underflow"
        "I/O error: "
        "Overflow"
        "Incomparable types: "
        "Float format: "
        "Signal "
        "Adding I/O task twice on port: "
        "No I/O tasks"
    } ?vector-nth ;

: ?kernel-error ( cons -- error# param )
    dup cons? [ uncons dup cons? [ car ] when ] [ f ] ifte ;

: kernel-error. ( error -- )
    ?kernel-error swap error# dup "" ? write
    dup [ . ] [ drop terpri ] ifte ;

: error. ( error -- str )
    dup kernel-error? [ kernel-error. ] [ . ] ifte ;