\ SAVE-INPUT and RESTORE-INPUT
+\
+\ This code is part of pForth.
+\
+\ Permission to use, copy, modify, and/or distribute this
+\ software for any purpose with or without fee is hereby granted.
+\
+\ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+\ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+\ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+\ THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+\ CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+\ FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+\ CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+\ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
anew task-save-input.fth
private{
-: save-buffer ( -- column source-id 2 ) >in @ source-id 2 ;
+: SAVE-BUFFER ( -- column source-id 2 ) >in @ source-id 2 ;
-: restore-column ( column -- flag )
- source nip over <
+\ Restore >IN from COLUMN unless COLUMN is too large. Valid values
+\ for COLUMN are from 0 to (including) the length of SOURCE plus one.
+: RESTORE-COLUMN ( column -- flag )
+ source nip 1+ over u<
IF drop true
ELSE >in ! false
THEN
\ file SOURCE-ID. Assume that the current line is stored in SOURCE
\ and that the current file-position is at an end-of-line (or
\ end-of-file).
-: line-start-position ( -- ud )
+: LINE-START-POSITION ( -- ud )
source-id file-position throw
\ unless at end-of-file, subtract newline
source-id file-size throw 2over d= 0= IF 1 s>d d- THEN
source nip s>d d-
;
-: save-file ( column line filepos:ud source-id 5 -- )
+: SAVE-FILE ( column line filepos:ud source-id 5 -- )
>in @
source-line-number@
line-start-position
5
;
-: restore-file ( column line filepos:ud -- flag )
- source-id reposition-file IF 2drop true exit THEN
- refill 0= IF 2drop true exit THEN
+: RESTORE-FILE ( column line filepos:ud -- flag )
+ source-id reposition-file IF 2drop true EXIT THEN
+ refill 0= IF 2drop true EXIT THEN
source-line-number!
restore-column
;
-: ndrop ( n*x n -- ) 0 ?do drop loop ;
+: NDROP ( n*x n -- ) 0 ?DO drop LOOP ;
}private
\ keyboard >IN SourceID=(0) 2
\ file >IN lineNumber filePos SourceID=(fileID) 5
: SAVE-INPUT ( -- column {line filepos}? source-id n )
- source-id case
- -1 of save-buffer endof
- 0 of save-buffer endof
- drop save-file exit
- endcase
+ source-id CASE
+ -1 OF save-buffer ENDOF
+ 0 OF save-buffer ENDOF
+ drop save-file EXIT
+ ENDCASE
;
: RESTORE-INPUT ( column {line filepos}? source-id n -- flag )
- over source-id <> IF ndrop true exit THEN
+ over source-id <> IF ndrop true EXIT THEN
drop
- case
- -1 of restore-column endof
- 0 of restore-column endof
- drop restore-file exit
- endcase
+ CASE
+ -1 OF restore-column ENDOF
+ 0 OF restore-column ENDOF
+ drop restore-file EXIT
+ ENDCASE
;
privatize