[gforth] / gforth / blocks.fs  

gforth: gforth/blocks.fs

Diff for /gforth/blocks.fs between version 1.11 and 1.31

version 1.11, Wed Oct 2 09:48:56 1996 UTC version 1.31, Wed Sep 6 20:30:06 2000 UTC
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 \ A less simple implementation of the blocks wordset.  \ A less simple implementation of the blocks wordset.
   
 \ Copyright (C) 1995 Free Software Foundation, Inc.  \ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
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 require struct.fs  require struct.fs
   
 struct  struct
     1           cells: field buffer-block   \ the block number      cell%               field buffer-block   \ the block number
     1           cells: field buffer-fid     \ the block's fid      cell%               field buffer-fid     \ the block's fid
     1           cells: field buffer-dirty   \ the block dirty flag      cell%               field buffer-dirty   \ the block dirty flag
     chars/block chars: field block-buffer   \ the data      char% chars/block * field block-buffer   \ the data
     0           cells: field next-buffer      cell% 0 *           field next-buffer
 end-struct buffer-struct  end-struct buffer-struct
   
 Variable block-buffers  Variable block-buffers
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 $20 Value buffers  $20 Value buffers
   
 User block-fid  User block-fid
   User block-offset ( -- addr ) \ gforth
   \G User variable containing the number of the first block (default
   \G since 0.5.0: 0).  Block files created with Gforth versions before
   \G 0.5.0 have the offset 1.  If you use these files you can: @code{1
   \G offset !}; or add 1 to every block number used; or prepend 1024
   \G characters to the file.
   0 block-offset !  \ store 1 here fore 0.4.0 compatibility
   
   ' block-offset alias offset \ !! eliminate this?
   
   : block-cold ( -- )
       block-fid off  last-block off
       buffer-struct buffers * %alloc dup block-buffers ! ( addr )
       buffer-struct %size buffers * erase ;
   
 : block-cold  ' block-cold INIT8 chained
     defers 'cold  block-fid off  last-block off  
     buffers buffer-struct drop * allocate throw dup block-buffers !  
     buffers buffer-struct drop * erase ;  
   
 ' block-cold IS 'cold  
   
 block-cold  block-cold
   
 Defer flush-file  Defer flush-blocks ( -- ) \ gforth
   
 : open-blocks ( addr u -- ) \ gforth  : open-blocks ( c-addr u -- ) \ gforth
     \g use the file, whose name is given by @var{addr u}, as blocks file      \g Use the file, whose name is given by @i{c-addr u}, as the blocks file.
     2dup ['] open-path-file catch 0<>      2dup open-fpath-file 0<>
     if      if
         2drop r/w bin create-file throw          r/w bin create-file throw
     else      else
         rot close-file throw  2dup file-status throw bin open-file throw          rot close-file throw  2dup file-status throw bin open-file throw
         >r 2drop r>          >r 2drop r>
     then      then
     block-fid @ IF  flush-file block-fid @ close-file throw  THEN      block-fid @ IF  flush-blocks block-fid @ close-file throw  THEN
     block-fid ! ;      block-fid ! ;
   
 : use ( "file" -- ) \ gforth  : use ( "file" -- ) \ gforth
     \g use @var{file} as blocks file      \g Use @i{file} as the blocks file.
     name open-blocks ;      name open-blocks ;
   
 \ the file is opened as binary file, since it either will contain text  \ the file is opened as binary file, since it either will contain text
 \ without newlines or binary data  \ without newlines or binary data
 : get-block-fid ( -- fid )  : get-block-fid ( -- wfileid ) \ gforth
       \G Return the file-id of the current blocks file. If no blocks
       \G file has been opened, use @file{blocks.fb} as the default
       \G blocks file.
     block-fid @ 0=      block-fid @ 0=
     if      if
         s" blocks.fb" open-blocks          s" blocks.fb" open-blocks
     then      then
     block-fid @ ;      block-fid @ ;
   
 : block-position ( u -- )  : block-position ( u -- ) \ block
     \ positions the block file to the start of block u      \G Position the block file to the start of block @i{u}.
     1- chars/block chars um* get-block-fid reposition-file throw ;      offset @ - chars/block chars um* get-block-fid reposition-file throw ;
   
 : update ( -- )  : update ( -- ) \ block
       \G Mark the state of the current block buffer as assigned-dirty.
     last-block @ ?dup IF  buffer-dirty on  THEN ;      last-block @ ?dup IF  buffer-dirty on  THEN ;
   
 : save-buffer ( buffer -- ) >r  : save-buffer ( buffer -- ) \ gforth
       >r
     r@ buffer-dirty @ r@ buffer-block @ 0<> and      r@ buffer-dirty @ r@ buffer-block @ 0<> and
     if      if
         r@ buffer-block @ block-position          r@ buffer-block @ block-position
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     endif      endif
     rdrop ;      rdrop ;
   
 : empty-buffer ( buffer -- )  : empty-buffer ( buffer -- ) \ gforth
     buffer-block off ;      buffer-block off ;
   
 : save-buffers  ( -- )    block-buffers @  : save-buffers  ( -- ) \ block
       \G Transfer the contents of each @code{update}d block buffer to
       \G mass storage, then mark all block buffers as assigned-clean.
       block-buffers @
     buffers 0 ?DO  dup save-buffer  next-buffer  LOOP  drop ;      buffers 0 ?DO  dup save-buffer  next-buffer  LOOP  drop ;
   
 : empty-buffers ( -- )    block-buffers @  : empty-buffers ( -- ) \ block-ext
       \G Mark all block buffers as unassigned; if any had been marked as
       \G assigned-dirty (by @code{update}), the changes to those blocks
       \G will be lost.
       block-buffers @
     buffers 0 ?DO  dup empty-buffer  next-buffer  LOOP  drop ;      buffers 0 ?DO  dup empty-buffer  next-buffer  LOOP  drop ;
   
 : flush ( -- )  : flush ( -- ) \ block
       \G Perform the functions of @code{save-buffers} then
       \G @code{empty-buffers}.
     save-buffers      save-buffers
     empty-buffers ;      empty-buffers ;
   
 ' flush IS flush-file  ' flush IS flush-blocks
   
 : get-buffer ( n -- a-addr )  : get-buffer ( u -- a-addr ) \ gforth
     buffers mod buffer-struct drop * block-buffers @ + ;      0 buffers um/mod drop buffer-struct %size * block-buffers @ + ;
   
 : block ( u -- a-addr )  : block ( u -- a-addr ) \ gforthman- block
     dup 0= -35 and throw      \G If a block buffer is assigned for block @i{u}, return its
       \G start address, @i{a-addr}. Otherwise, assign a block buffer
       \G for block @i{u} (if the assigned block buffer has been
       \G @code{update}d, transfer the contents to mass storage), read
       \G the block into the block buffer and return its start address,
       \G @i{a-addr}.
       dup offset @ u< -35 and throw
     dup get-buffer >r      dup get-buffer >r
     dup r@ buffer-block @ <>      dup r@ buffer-block @ <>
     r@ buffer-fid @ block-fid @ <> or      r@ buffer-fid @ block-fid @ <> or
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     then      then
     r> dup last-block ! block-buffer ;      r> dup last-block ! block-buffer ;
   
 : buffer ( u -- a-addr )  : buffer ( u -- a-addr ) \ block
       \G If a block buffer is assigned for block @i{u}, return its
       \G start address, @i{a-addr}. Otherwise, assign a block buffer
       \G for block @i{u} (if the assigned block buffer has been
       \G @code{update}d, transfer the contents to mass storage) and
       \G return its start address, @i{a-addr}.  The subtle difference
       \G between @code{buffer} and @code{block} mean that you should
       \G only use @code{buffer} if you don't care about the previous
       \G contents of block @i{u}. In Gforth, this simply calls
       \G @code{block}.
     \ reading in the block is unnecessary, but simpler      \ reading in the block is unnecessary, but simpler
     block ;      block ;
   
 User scr 0 scr !  User scr ( -- a-addr ) \ block-ext s-c-r
       \G @code{User} variable -- @i{a-addr} is the address of a cell containing
 : updated?  ( n -- f )   scr @ buffer      \G the block number of the block most recently processed by
       \G @code{list}.
   0 scr !
   
   \ nac31Mar1999 moved "scr @" to list to make the stack comment correct
   : updated?  ( n -- f ) \ gforth
       \G Return true if @code{updated} has been used to mark block @i{n}
       \G as assigned-dirty.
       buffer
     [ 0 buffer-dirty 0 block-buffer - ] Literal + @ ;      [ 0 buffer-dirty 0 block-buffer - ] Literal + @ ;
   
 : list ( u -- )  : list ( u -- ) \ block-ext
       \G Display block @i{u}. In Gforth, the block is displayed as 16
       \G numbered lines, each of 64 characters.
     \ calling block again and again looks inefficient but is necessary      \ calling block again and again looks inefficient but is necessary
     \ in a multitasking environment      \ in a multitasking environment
     dup scr !      dup scr !
     ." Screen " u.      ." Screen " u.
     updated?  0= IF ." not "  THEN  ." modified     " cr      scr @ updated?  0= IF ." not "  THEN  ." modified     " cr
     16 0      16 0
     ?do      ?do
         i 2 .r space scr @ block i 64 * chars + 64 type cr          i 2 .r space scr @ block i 64 * chars + 64 type cr
     loop ;      loop ;
   
 : (source)  ( -- addr len )  : (source)  ( -- c-addr u )
   blk @ ?dup    blk @ ?dup
   IF    block chars/block    IF    block chars/block
   ELSE  tib #tib @    ELSE  tib #tib @
   THEN ;    THEN ;
   
 ' (source) IS source  ' (source) IS source ( -- c-addr u ) \ core
   \G @i{c-addr} is the address of the input buffer and @i{u} is the
 : load ( i*x n -- j*x )  \G number of characters in it.
   
   : load ( i*x n -- j*x ) \ block
       \G Save the current input source specification. Store @i{n} in
       \G @code{BLK}, set @code{>IN} to 0 and interpret. When the parse
       \G area is exhausted, restore the input source specification.
       loadfilename# @ >r
       2 loadfilename# ! \ "\a block/"
   push-file    push-file
   dup loadline ! blk ! >in off ( ['] ) interpret ( catch )      dup loadline ! blk ! >in off ['] interpret catch
   pop-file ( throw ) ;      pop-file
       r> loadfilename# !
 : thru ( i*x n1 n2 -- j*x )      throw ;
   1+ swap 0 ?DO  I load  LOOP ;  
   : thru ( i*x n1 n2 -- j*x ) \ block-ext
 : +load ( i*x n -- j*x )  blk @ + load ;      \G @code{load} the blocks @i{n1} through @i{n2} in sequence.
       1+ swap ?DO  I load  LOOP ;
 : +thru ( i*x n1 n2 -- j*x )  
   1+ swap 0 ?DO  I +load  LOOP ;  : +load ( i*x n -- j*x ) \ gforth
       \G Used within a block to load the block specified as the
 : --> ( -- )  refill drop ; immediate      \G current block + @i{n}.
       blk @ + load ;
 : block-included ( addr u -- )  
   : +thru ( i*x n1 n2 -- j*x ) \ gforth
       \G Used within a block to load the range of blocks specified as the
       \G current block + @i{n1} thru the current block + @i{n2}.
       1+ swap ?DO  I +load  LOOP ;
   
   : --> ( -- ) \ gforthman- gforth chain
       \G If this symbol is encountered whilst loading block @i{n},
       \G discard the remainder of the block and load block @i{n+1}. Used
       \G for chaining multiple blocks together as a single loadable
       \G unit.  Not recommended, because it destroys the independence of
       \G loading.  Use @code{thru} (which is standard) or @code{+thru}
       \G instead.
       refill drop ; immediate
   
   : block-included ( a-addr u -- ) \ gforth
       \G Use within a block that is to be processed by @code{load}. Save
       \G the current blocks file specification, open the blocks file
       \G specified by @i{a-addr u} and @code{load} block 1 from that
       \G file (which may in turn chain or load other blocks). Finally,
       \G close the blocks file and restore the original blocks file.
     block-fid @ >r block-fid off open-blocks      block-fid @ >r block-fid off open-blocks
     1 load block-fid @ close-file throw flush      1 load block-fid @ close-file throw flush
     r> block-fid ! ;      r> block-fid ! ;
   
 : include ( "name" -- )  \ thrown out because it may provide unpleasant surprises - anton
     name 2dup dup 3 - /string s" .fb" compare  \ : include ( "name" -- )
     0= IF  block-included  ELSE  included  THEN ;  \     name 2dup dup 3 - /string s" .fb" compare
   \     0= IF  block-included  ELSE  included  THEN ;
   
 get-current environment-wordlist set-current  get-current environment-wordlist set-current
 true constant block  true constant block
 true constant block-ext  true constant block-ext
 set-current  set-current
   
 : bye  ['] flush catch drop bye ;  
   : bye ( -- ) \ tools-ext
     \G Return control to the host operating system (if any).
     ['] flush catch drop bye ;

Generate output suitable for use with a patch program
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  Added in v.1.31
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