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Annotation of gforth/depth-changes.fs, revision 1.1

1.1     ! anton       1: \ report stack depth changes in source code in various (optional) ways
        !             2: 
        !             3: \ Copyright (C) 2004 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 2
        !            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, write to the Free Software
        !            19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
        !            20: 
        !            21: 
        !            22: \ Use this program like this:
        !            23: \ include it, then the program you want to check
        !            24: \ e.g., start it with
        !            25: \  gforth depth-changes.fs myprog.fs
        !            26: 
        !            27: \ By default this will report stack depth changes at every empty line
        !            28: \ in interpret state.  You can vary this by using
        !            29: 
        !            30: \  gforth depth-changes.fs -e "' <word> IS depth-changes-filter" myprog.fs
        !            31: 
        !            32: \ with the following values for <word>:
        !            33: 
        !            34: \ <word>      meaning
        !            35: \ all-lines   every line in interpret state
        !            36: \ most-lines  every line in interpret state not ending with "\"
        !            37: 
        !            38: 2variable last-depths
        !            39: 
        !            40: defer depth-changes-filter ( -- f )
        !            41: \G true if the line should be checked for depth changes
        !            42:     
        !            43: : all-lines ( -- f )
        !            44:     state @ 0= ;
        !            45: 
        !            46: : empty-lines ( -- f )
        !            47:     source (parse-white) nip 0= all-lines and ;
        !            48: 
        !            49: : most-lines ( -- f )
        !            50:     source dup if
        !            51:        1- chars + c@ '\ <>
        !            52:     else
        !            53:        2drop true
        !            54:     endif
        !            55:     all-lines and ;
        !            56: 
        !            57: ' empty-lines is depth-changes-filter
        !            58: 
        !            59: : check-line ( -- )
        !            60:     depth-changes-filter if
        !            61:        sp@ fp@ last-depths 2@
        !            62:        2over last-depths 2!
        !            63:        d<> if
        !            64:            ['] ~~ execute
        !            65:        endif
        !            66:     endif ;
        !            67: 
        !            68: sp@ fp@ last-depths 2!
        !            69: 
        !            70: ' check-line is line-end-hook