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Annotation of gforth/str-exec.fs, revision 1.1

1.1     ! anton       1: \ >STRING-EXECUTE >BUFFER-EXECUTE
        !             2: \
        !             3: \ Copyright (C) 2011 Free Software Foundation, Inc.
        !             4: 
        !             5: \ This file is part of Gforth.
        !             6: 
        !             7: \ Gforth is free software; you can redistribute it and/or
        !             8: \ modify it under the terms of the GNU General Public License
        !             9: \ as published by the Free Software Foundation, either version 3
        !            10: \ of the License, or (at your option) any later version.
        !            11: 
        !            12: \ This program is distributed in the hope that it will be useful,
        !            13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15: \ GNU General Public License for more details.
        !            16: 
        !            17: \ You should have received a copy of the GNU General Public License
        !            18: \ along with this program. If not, see http://www.gnu.org/licenses/.
        !            19: 
        !            20: 32 constant >string-initial-buflen
        !            21: 
        !            22: 2variable >string-buffer \ buffer
        !            23: variable  >string-len    \ actual string length
        !            24: 
        !            25: : >string-type { c-addr u -- }
        !            26:     >string-len @ { str-len }
        !            27:     str-len u + { new-str-len }
        !            28:     >string-buffer 2@
        !            29:     begin { buf-addr buf-size }
        !            30:        new-str-len buf-size > while
        !            31:            buf-size 2* buf-addr over resize throw swap
        !            32:            2dup >string-buffer 2!
        !            33:     repeat 
        !            34:     c-addr buf-addr str-len + u move
        !            35:     new-str-len >string-len ! ;
        !            36: 
        !            37: : >string-emit { c^ c -- }
        !            38:     c 1 >string-type ;
        !            39: 
        !            40: : >string-execute ( ... xt -- ... addr u )
        !            41:     \ execute xt while the standard output (TYPE, EMIT, and everything
        !            42:     \ that uses them) is redirected to a string.  The resulting string
        !            43:     \ is addr u, which is in ALLOCATEd memory; it is the
        !            44:     \ responsibility of the caller of >STRING-EXECUTE to FREE this
        !            45:     \ string.
        !            46:     >string-buffer 2@ >string-len @
        !            47:     action-of type action-of emit    { d: oldbuf oldlen oldtype oldemit }
        !            48:     try
        !            49:        >string-initial-buflen dup allocate throw swap >string-buffer 2!
        !            50:        0 >string-len !
        !            51:        ['] >string-type is type
        !            52:        ['] >string-emit is emit
        !            53:        execute
        !            54:        >string-buffer 2@ drop >string-len @ tuck resize throw swap
        !            55:        0 \ throw ball
        !            56:     restore
        !            57:        oldbuf >string-buffer 2!
        !            58:        oldlen >string-len !
        !            59:        oldtype is type
        !            60:        oldemit is emit
        !            61:     endtry
        !            62:     throw ;
        !            63: 
        !            64: 0 [if]
        !            65: \ tests
        !            66: 5 ' . >string-execute dump
        !            67: 5 5 ' .r >string-execute dump
        !            68: 
        !            69: : test 0 do i . loop ;
        !            70: 
        !            71: cr  20 ' test >string-execute .s cr 2dup type drop free throw
        !            72: cr 120 ' test >string-execute .s cr 2dup type drop free throw
        !            73: cr
        !            74: [endif]