version 1.39, 1999/02/03 00:10:21
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version 1.61, 2011/12/21 18:00:00
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\ A powerful locals implementation |
\ A powerful locals implementation |
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\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2007 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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\ Gforth is free software; you can redistribute it and/or |
\ Gforth is free software; you can redistribute it and/or |
\ modify it under the terms of the GNU General Public License |
\ modify it under the terms of the GNU General Public License |
\ as published by the Free Software Foundation; either version 2 |
\ as published by the Free Software Foundation, either version 3 |
\ of the License, or (at your option) any later version. |
\ of the License, or (at your option) any later version. |
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\ This program is distributed in the hope that it will be useful, |
\ This program is distributed in the hope that it will be useful, |
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\ GNU General Public License for more details. |
\ GNU General Public License for more details. |
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\ You should have received a copy of the GNU General Public License |
\ You should have received a copy of the GNU General Public License |
\ along with this program; if not, write to the Free Software |
\ along with this program. If not, see http://www.gnu.org/licenses/. |
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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\ More documentation can be found in the manual and in |
\ More documentation can be found in the manual and in |
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require search.fs |
require search.fs |
require float.fs |
require float.fs |
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require extend.fs \ for case |
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: compile-@local ( n -- ) \ gforth compile-fetch-local |
: compile-@local ( n -- ) \ gforth compile-fetch-local |
case |
case |
Line 224 variable locals-dp \ so here's the speci
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Line 224 variable locals-dp \ so here's the speci
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: create-local ( " name" -- a-addr ) |
: create-local ( " name" -- a-addr ) |
\ defines the local "name"; the offset of the local shall be |
\ defines the local "name"; the offset of the local shall be |
\ stored in a-addr |
\ stored in a-addr |
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dp |
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locals-dp dpp ! |
create |
create |
immediate restrict |
immediate restrict |
here 0 , ( place for the offset ) ; |
here 0 , ( place for the offset ) |
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swap dpp ! ; |
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: lp-offset ( n1 -- n2 ) |
: lp-offset ( n1 -- n2 ) |
\ converts the offset from the frame start to an offset from lp and |
\ converts the offset from the frame start to an offset from lp and |
Line 292 locals-types definitions
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Line 295 locals-types definitions
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postpone laddr# @ lp-offset, ; |
postpone laddr# @ lp-offset, ; |
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\ you may want to make comments in a locals definitions group: |
\ you may want to make comments in a locals definitions group: |
' \ alias \ ( -- ) \ core-ext,block-ext backslash |
' \ alias \ ( compilation 'ccc<newline>' -- ; run-time -- ) \ core-ext,block-ext backslash |
\G Line comment: if @code{BLK} contains 0, parse and discard the remainder |
\G Comment till the end of the line if @code{BLK} contains 0 (i.e., |
\G of the parse area. Otherwise, parse and discard all subsequent characters in the |
\G while not loading a block), parse and discard the remainder of the |
\G parse area corresponding to the current line. |
\G parse area. Otherwise, parse and discard all subsequent characters |
immediate |
\G in the parse area corresponding to the current line. |
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immediate |
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' ( alias ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file paren |
' ( alias ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file paren |
\G Comment: parse and discard all subsequent characters in the parse |
\G Comment, usually till the next @code{)}: parse and discard all |
\G area until ")" is encountered. During interactive input, an end-of-line |
\G subsequent characters in the parse area until ")" is |
\G also acts as a comment terminator. For file input, it does not; if the |
\G encountered. During interactive input, an end-of-line also acts as |
\G end-of-file is encountered whilst parsing for the ")" delimiter, Gforth |
\G a comment terminator. For file input, it does not; if the |
\G will generate a warning. |
\G end-of-file is encountered whilst parsing for the ")" delimiter, |
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\G Gforth will generate a warning. |
immediate |
immediate |
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forth definitions |
forth definitions |
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also locals-types |
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\ these "locals" are used for comparison in TO |
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here locals-dp ! |
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c: some-clocal 2drop |
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d: some-dlocal 2drop |
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f: some-flocal 2drop |
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w: some-wlocal 2drop |
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locals-dp @ dp ! |
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\ the following gymnastics are for declaring locals without type specifier. |
\ the following gymnastics are for declaring locals without type specifier. |
\ we exploit a feature of our dictionary: every wordlist |
\ we exploit a feature of our dictionary: every wordlist |
\ has it's own methods for finding words etc. |
\ has it's own methods for finding words etc. |
\ So we create a vocabulary new-locals, that creates a 'w:' local named x |
\ So we create a vocabulary new-locals, that creates a 'w:' local named x |
\ when it is asked if it contains x. |
\ when it is asked if it contains x. |
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also locals-types |
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: new-locals-find ( caddr u w -- nfa ) |
: new-locals-find ( caddr u w -- nfa ) |
\ this is the find method of the new-locals vocabulary |
\ this is the find method of the new-locals vocabulary |
\ make a new local with name caddr u; w is ignored |
\ make a new local with name caddr u; w is ignored |
\ the returned nfa denotes a word that produces what W: produces |
\ the returned nfa denotes a word that produces what W: produces |
\ !! do the whole thing without nextname |
\ !! do the whole thing without nextname |
drop nextname |
drop nextname |
['] W: >name ; |
['] W: >head-noprim ; |
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previous |
previous |
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Line 335 create new-locals-map ( -- wordlist-map
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Line 348 create new-locals-map ( -- wordlist-map
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' drop A, \ rehash method |
' drop A, \ rehash method |
' drop A, |
' drop A, |
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slowvoc @ |
new-locals-map mappedwordlist Constant new-locals-wl |
slowvoc on |
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vocabulary new-locals |
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slowvoc ! |
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new-locals-map ' new-locals >body wordlist-map A! \ !! use special access words |
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variable old-dpp |
\ slowvoc @ |
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\ slowvoc on |
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\ vocabulary new-locals |
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\ slowvoc ! |
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\ new-locals-map ' new-locals >body wordlist-map A! \ !! use special access words |
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\ and now, finally, the user interface words |
\ and now, finally, the user interface words |
: { ( -- lastxt wid 0 ) \ gforth open-brace |
: { ( -- latestxt wid 0 ) \ gforth open-brace |
dp old-dpp ! |
latestxt get-current |
locals-dp dpp ! |
get-order new-locals-wl swap 1+ set-order |
lastxt get-current |
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also new-locals |
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also locals definitions locals-types |
also locals definitions locals-types |
0 TO locals-wordlist |
0 TO locals-wordlist |
0 postpone [ ; immediate |
0 postpone [ ; immediate |
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locals-types definitions |
locals-types definitions |
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: } ( lastxt wid 0 a-addr1 xt1 ... -- ) \ gforth close-brace |
: } ( latestxt wid 0 a-addr1 xt1 ... -- ) \ gforth close-brace |
\ ends locals definitions |
\ ends locals definitions |
] old-dpp @ dpp ! |
] |
begin |
begin |
dup |
dup |
while |
while |
Line 484 forth definitions
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Line 495 forth definitions
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: locals-:-hook ( sys -- sys addr xt n ) |
: locals-:-hook ( sys -- sys addr xt n ) |
\ addr is the nfa of the defined word, xt its xt |
\ addr is the nfa of the defined word, xt its xt |
DEFERS :-hook |
DEFERS :-hook |
last @ lastcfa @ |
latest latestxt |
clear-leave-stack |
clear-leave-stack |
0 locals-size ! |
0 locals-size ! |
locals-buffer locals-dp ! |
locals-buffer locals-dp ! |
Line 627 forth definitions
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Line 638 forth definitions
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2drop |
2drop |
endif ; |
endif ; |
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: >definer ( xt -- definer ) |
: >definer ( xt -- definer ) \ gforth |
\ this gives a unique identifier for the way the xt was defined |
\G @var{Definer} is a unique identifier for the way the @var{xt} |
\ words defined with different does>-codes have different definers |
\G was defined. Words defined with different @code{does>}-codes |
\ the definer can be used for comparison and in definer! |
\G have different definers. The definer can be used for |
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\G comparison and in @code{definer!}. |
dup >does-code |
dup >does-code |
?dup-if |
?dup-if |
nip 1 or |
nip 1 or |
Line 638 forth definitions
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Line 650 forth definitions
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>code-address |
>code-address |
then ; |
then ; |
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: definer! ( definer xt -- ) |
: definer! ( definer xt -- ) \ gforth |
\ gives the word represented by xt the behaviour associated with definer |
\G The word represented by @var{xt} changes its behaviour to the |
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\G behaviour associated with @var{definer}. |
over 1 and if |
over 1 and if |
swap [ 1 invert ] literal and does-code! |
swap [ 1 invert ] literal and does-code! |
else |
else |
Line 654 forth definitions
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Line 667 forth definitions
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-&32 throw |
-&32 throw |
endif ; |
endif ; |
:noname |
:noname |
0 0 0. 0.0e0 { c: clocal w: wlocal d: dlocal f: flocal } |
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comp' drop dup >definer |
comp' drop dup >definer |
case |
case |
[ ' locals-wordlist ] literal >definer \ value |
[ ' locals-wordlist ] literal >definer \ value |
Line 662 forth definitions
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Line 674 forth definitions
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\ !! dependent on c: etc. being does>-defining words |
\ !! dependent on c: etc. being does>-defining words |
\ this works, because >definer uses >does-code in this case, |
\ this works, because >definer uses >does-code in this case, |
\ which produces a relocatable address |
\ which produces a relocatable address |
[ comp' clocal drop >definer ] literal |
[ comp' some-clocal drop ] literal >definer |
OF POSTPONE laddr# >body @ lp-offset, POSTPONE c! ENDOF |
OF POSTPONE laddr# >body @ lp-offset, POSTPONE c! ENDOF |
[ comp' wlocal drop >definer ] literal |
[ comp' some-wlocal drop ] literal >definer |
OF POSTPONE laddr# >body @ lp-offset, POSTPONE ! ENDOF |
OF POSTPONE laddr# >body @ lp-offset, POSTPONE ! ENDOF |
[ comp' dlocal drop >definer ] literal |
[ comp' some-dlocal drop ] literal >definer |
OF POSTPONE laddr# >body @ lp-offset, POSTPONE 2! ENDOF |
OF POSTPONE laddr# >body @ lp-offset, POSTPONE 2! ENDOF |
[ comp' flocal drop >definer ] literal |
[ comp' some-flocal drop ] literal >definer |
OF POSTPONE laddr# >body @ lp-offset, POSTPONE f! ENDOF |
OF POSTPONE laddr# >body @ lp-offset, POSTPONE f! ENDOF |
-&32 throw |
-&32 throw |
endcase ; |
endcase ; |
interpret/compile: TO ( c|w|d|r "name" -- ) \ core-ext,local |
interpret/compile: TO ( c|w|d|r "name" -- ) \ core-ext,local |
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: locals| |
: locals| ( ... "name ..." -- ) \ local-ext locals-bar |
\ don't use 'locals|'! use '{'! A portable and free '{' |
\ don't use 'locals|'! use '{'! A portable and free '{' |
\ implementation is compat/anslocals.fs |
\ implementation is compat/anslocals.fs |
BEGIN |
BEGIN |
name 2dup s" |" compare 0<> |
name 2dup s" |" str= 0= |
WHILE |
WHILE |
(local) |
(local) |
REPEAT |
REPEAT |