version 1.11, 1996/10/02 09:48:56
|
version 1.29, 2000/02/28 21:27:07
|
Line 1
|
Line 1
|
\ 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. |
|
|
Line 32
|
Line 32
|
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 |
Line 45 Variable last-block
|
Line 45 Variable last-block
|
$20 Value buffers |
$20 Value buffers |
|
|
User block-fid |
User block-fid |
|
User offset 0 offset ! \ store 1 here fore 0.4.0 compatibility |
|
|
: block-cold |
: block-cold ( -- ) |
defers 'cold block-fid off last-block off |
block-fid off last-block off |
buffers buffer-struct drop * allocate throw dup block-buffers ! |
buffer-struct buffers * %alloc dup block-buffers ! ( addr ) |
buffers buffer-struct drop * erase ; |
buffer-struct %size buffers * erase ; |
|
|
' block-cold IS 'cold |
' block-cold INIT8 chained |
|
|
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 |
Line 98 Defer flush-file
|
Line 104 Defer flush-file
|
endif |
endif |
rdrop ; |
rdrop ; |
|
|
: empty-buffer ( buffer -- ) |
: empty-buffer ( buffer -- ) \ gforth |
buffer-block off ; |
buffer-block off ; |
|
|
: save-buffers ( -- ) block-buffers @ |
: save-buffers ( -- ) \ block |
buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; |
\G Transfer the contents of each @code{update}d block buffer to |
|
\G mass storage, then mark all block buffers as unassigned. |
: empty-buffers ( -- ) block-buffers @ |
block-buffers @ |
buffers 0 ?DO dup empty-buffer next-buffer LOOP drop ; |
buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; |
|
|
: flush ( -- ) |
: 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 ; |
|
|
|
: 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 |
Line 134 Defer flush-file
|
Line 155 Defer flush-file
|
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. |
push-file |
|
dup loadline ! blk ! >in off ( ['] ) interpret ( catch ) |
: load ( i*x n -- j*x ) \ block |
pop-file ( throw ) ; |
\G Save the current input source specification. Store @i{n} in |
|
\G @code{BLK}, set @code{>IN} to 0 and interpret. When the parse |
: thru ( i*x n1 n2 -- j*x ) |
\G area is exhausted, restore the input source specification. |
1+ swap 0 ?DO I load LOOP ; |
push-file |
|
dup loadline ! blk ! >in off ['] interpret catch |
: +load ( i*x n -- j*x ) blk @ + load ; |
pop-file throw ; |
|
|
: +thru ( i*x n1 n2 -- j*x ) |
: thru ( i*x n1 n2 -- j*x ) \ block-ext |
1+ swap 0 ?DO I +load LOOP ; |
\G @code{load} the blocks @i{n1} through @i{n2} in sequence. |
|
1+ swap ?DO I load LOOP ; |
: --> ( -- ) refill drop ; immediate |
|
|
: +load ( i*x n -- j*x ) \ gforth |
: block-included ( addr u -- ) |
\G Used within a block to load the block specified as the |
|
\G current block + @i{n}. |
|
blk @ + load ; |
|
|
|
: +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 ; |