42 lines
1.6 KiB
Factor
42 lines
1.6 KiB
Factor
! Copyright (C) 2004, 2005 Slava Pestov.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: errors
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USING: kernel kernel-internals lists sequences ;
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TUPLE: no-method object generic ;
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: no-method ( object generic -- ) <no-method> throw ;
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: >c ( continuation -- ) catchstack* push ;
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: c> ( -- continuation ) catchstack* pop ;
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: catch ( try -- exception/f | try: -- )
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#! Call the try quotation. If an exception is thrown in the
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#! dynamic extent of the quotation, restore the datastack
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#! and push the exception. Otherwise, the data stack is
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#! not restored, and f is pushed.
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[ >c call f c> drop f ] callcc1 nip ; inline
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: rethrow ( error -- )
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#! Use rethrow when passing an error on from a catch block.
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catchstack empty?
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[ die "Can't happen" throw ] [ c> continue-with ] if ;
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: cleanup ( try cleanup -- | try: -- | cleanup: -- )
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#! Call the try quotation. If an exception is thrown in the
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#! dynamic extent of the quotation, restore the datastack
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#! and run the cleanup quotation. Then throw the error to
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#! the next outermost catch handler.
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[ >c >r call c> drop r> call ]
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[ drop (continue-with) >r nip call r> rethrow ] ifcc ; inline
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: recover ( try recovery -- | try: -- | recovery: error -- )
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#! Call the try quotation. If an exception is thrown in the
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#! dynamic extent of the quotation, restore the datastack,
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#! push the exception on the datastack, and call the
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#! recovery quotation.
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[ >c drop call c> drop ]
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[ drop (continue-with) rot drop swap call ] ifcc ; inline
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GENERIC: error. ( error -- )
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