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* fth/save-input.fth (restore-column): Use ELSE instead of EXIT THEN.
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ellerh committed Dec 31, 2016
1 parent 0868989 commit 09d08b4
Showing 1 changed file with 30 additions and 28 deletions.
58 changes: 30 additions & 28 deletions fth/save-input.fth
Original file line number Diff line number Diff line change
Expand Up @@ -7,35 +7,37 @@ private{
: save-buffer ( -- column source-id 2 ) >in @ source-id 2 ;

: restore-column ( column -- flag )
source nip over < if drop true exit then
>in ! false
source nip over <
IF drop true
ELSE >in ! false
THEN
;

\ Return the file-position of the beginning of the current line in
\ 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 )
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
\ subtract line length
source nip s>d d-
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
\ subtract line length
source nip s>d d-
;

: save-file ( column line filepos:ud source-id 5 -- )
>in @
source-line-number@
line-start-position
source-id
5
>in @
source-line-number@
line-start-position
source-id
5
;

: restore-file ( column line filepos:ud -- flag )
source-id reposition-file if 2drop true exit then
source-line-number!
refill 0= if drop true exit then
restore-column
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 ;
Expand All @@ -47,21 +49,21 @@ 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
drop
case
-1 of restore-column endof
0 of restore-column endof
drop restore-file exit
endcase
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
;

privatize

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