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nxu/femto.tal

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( femto.tal )
( )
( requires terminal to be in raw mode )
( see femto launcher script for more details )
( TODO: )
( - get long line truncation/scrolling working )
( - allow line numbers to be toggled off )
( - open file command? )
( - close file command? )
( - search&replace )
|00 @System [ &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1 ]
|10 @Console [ &vector $2 &read $1 &pad $5 &write $1 &error $1 ]
|a0 @File [ &vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2 ]
( MAX file size is currently #ce80, i.e. 52864 bytes )
%dbg { #ff .System/debug DEO }
%emit { .Console/write DEO }
%sp { #2018 DEO }
%nl { #0a18 DEO }
%cr { #0d18 DEO }
%crlf { cr nl }
%ansi { #1b18 DEO #5b18 DEO }
( emit macros )
( )
( these save one byte and are easier to read. )
%emit-! { LIT2 "! 18 DEO }
%emit-$ { LIT2 "$ 18 DEO }
%emit-lpar { LIT2 28 18 DEO }
%emit-rpar { LIT2 29 18 DEO }
%emit-, { LIT2 ", 18 DEO }
%emit-0 { LIT2 "0 18 DEO }
%emit-1 { LIT2 "1 18 DEO }
%emit-2 { LIT2 "2 18 DEO }
%emit-3 { LIT2 "3 18 DEO }
%emit-6 { LIT2 "6 18 DEO }
%emit-7 { LIT2 "7 18 DEO }
%emit-: { LIT2 ": 18 DEO }
%emit-; { LIT2 "; 18 DEO }
%emit-C { LIT2 "C 18 DEO }
%emit-H { LIT2 "H 18 DEO }
%emit-J { LIT2 "J 18 DEO }
%emit-K { LIT2 "K 18 DEO }
%emit-[ { LIT2 "[ 18 DEO }
%emit-] { LIT2 "] 18 DEO }
%emit-m { LIT2 "m 18 DEO }
%emit-n { LIT2 "n 18 DEO }
%emit-~ { LIT2 "~ 18 DEO }
%quit! { #01 .System/halt DEO BRK }
%lmargin { #0006 }
( zero page )
|0000
( terminal size information )
( )
( for now these are constant but eventually we could detect terminal resizes )
@term [
&cols $2 ( relative x coordinate of cursor, from 0 )
&rows $2 ( relative y coordinate of cursor, from 1 )
]
( configuration settings used when editing )
( )
( these can be changed at any time without breaking anything else )
@config [
&tab-width $2 ( how many spaces to display tab chars )
&tab-adjust $2 ( how many "extra" spaces; tab-width - 1 )
&insert-tabs $1 ( tab key inserts tabs when true )
&color $2 ( digits of highlight color in reverse order )
&red $2 ( digits of color for line/EOF markers in reverse order )
]
( tracks information related to the buffer's view of data )
( )
( limit and line-count change when we modify the buffer. )
( offset and line-offset change when we move the view port. )
@buffer [
&limit $2 ( last byte of actual data (not including \0) + 1 )
&line-count $2 ( total number of lines in file )
&offset $2 ( first byte of data visible in terminal )
&line-offset $2 ( first line of text visible in terminal )
]
( relative cursor positions, e.g. 0 to cols-1 )
( )
( when these change we may need to move the view port as well )
@cursor [
&col $2 ( current column value 0-n (may exceed lenght of row) )
&row $2 ( current relative row value, 0-(height-1) )
]
( tracks overall editor state between events )
@state [
&in-help $1 ( are we showing help? )
&in-undo $1 ( are we currently in undo? )
&key $1 ( last key read )
&saw-esc $1 ( did we just see ESC? )
&saw-xterm $1 ( did we just see an ESC [ xterm sequence? )
&saw-vt $1 ( did we just see an ESC [ $N vt sequence? )
&redraw $1 ( redrawing: bits determine which parts )
( 0x01 cursor )
( 0x02 statusbar )
( 0x04 prompt )
( 0x08 matches )
( 0x10 body and everything else )
&message $1 ( did we just print a message? )
&modified $1 ( has the buffer been modified? )
&quitting $1 ( are we in the process of quitting? )
]
( prompt uses .tmp/pos and .tmp/data to track user input )
@prompt [
&active $1 ( is prompt currently active? )
&vector $2 ( what code to run when user responds )
&string $2 ( string to print for the prompt )
]
( temporary input buffer used for a variety of things )
@tmp [
&pos $2 ( temporary pointer to address when reading data )
&data $80 ( small scratch pad when reading data )
]
( search uses .tmp/pos and .tmp/data to track query string )
@searching [
&active $1 ( are we displaying search results? )
&orig-row $2 ( row we began the search at )
&orig-col $2 ( col we began the search at )
&regex $2 ( regex to be stored if any )
&start $2 ( absolute start pos of match )
&end $2 ( absolute limit pos of match )
]
( startup )
|0100
( init zero page )
#0050 .term/cols STZ2
#0018 .term/rows STZ2
#0004 .config/tab-width STZ2
#0003 .config/tab-adjust STZ2
#00 .config/insert-tabs STZ
( #3333 .config/color STZ2 )
( #3133 .config/red STZ2 )
#3033 .config/color STZ2
#3033 .config/red STZ2
;data .buffer/offset STZ2
( start reading the filename from argv )
;filename .tmp/pos STZ2
;read-filename .Console/vector DEO2
BRK
( import uxn regex library )
~regex.tal
( ERROR HANDLING )
( using errorq will print the given message before causing )
( the interpreter to halt. )
@errorq ( msg* -> )
emit-! sp print nl dbg BRK
( open the given file at editor start up )
( )
( this is called during startup by ;read-filename )
( )
( TODO: enable closing/opening files with editor already running )
@open-file ( filename* -> )
.File/name DEO2
#ce81 .File/length DEO2
;data .File/read DEO2
.File/success DEI2 #0000 EQU2 .state/modified STZ
.File/success DEI2 #ce81 LTH2 ?&ok
crlf
;messages/input-error print
;filename print crlf quit!
( calculate buffer limit address using start + size )
&ok .File/success DEI2 ;data ADD2 .buffer/limit STZ2
JMP2r
( ask the terminal for its size )
( )
( called during editor initialization by ;read-filename )
( )
( TODO: consider supporting terminal resizing )
@setup-terminal-size ( -> )
#03e7 DUP2 term-move-cursor
term-get-cursor-position
;tmp/data .tmp/pos STZ2
;receive-terminal-size .Console/vector DEO2
JMP2r
( receive size information from the terminal )
( )
( called from Console/vector after ;setup-terminal-size )
@receive-terminal-size ( -> )
.Console/read DEI .state/key STZ
.state/key LDZ .tmp/pos LDZ2 STA
.tmp/pos LDZ2 INC2 .tmp/pos STZ2
.state/key LDZ LIT "R EQU ?parse-terminal-size
BRK
( parse and store terminal size information )
( )
( called by ;receive-terminal-size after complete message received )
@parse-terminal-size ( -> )
#0000 ,&acc STR2
.tmp/data LDZk #1b NEQ ?&parse-error ( i ) INC
LDZk LIT "[ NEQ ?&parse-error ( i ) INC
&loop
LDZk LIT "; EQU ?&parse-col
LIT2r :&loop !&read
&parse-col
INC ,&acc LDR2 #0002 SUB2 .term/rows STZ2
#0000 ,&acc STR2
&loop2
LDZk LIT "R EQU ?&done
LIT2r :&loop2 !&read
&read
LDZk LIT "0 SUB #00 SWP
,&acc LDR2 #000a MUL2 ADD2 ,&acc STR2
INC JMP2r
&done
,&acc LDR2 .term/cols STZ2 POP
;on-key .Console/vector DEO2
draw-all
BRK
[ &acc $2 ]
&parse-error POP .tmp/data LDZ2
;messages/term-size-parse-error !errorq
@count-c ( c^ -> n* )
#0000 ,&count STR2
STH ;data
&loop LDAk #00 EQU ?&done
LDAk STHkr NEQ ?&next
,&count LDR2 INC2 ,&count STR2
&next INC2 !&loop
&done POP2 POPr ,&count LDR2 JMP2r [ &count $2 ]
( save count of number of lines in input file )
( )
( this method also detects whether \t characters are used, )
( and uses this to initialize config/insert-tabs. )
@setup-linecount ( -> )
#0a count-c INC2 .buffer/line-count STZ2
#09 count-c #0000 GTH2 .config/insert-tabs STZ
JMP2r
( reads filename from the program's argv )
( )
( currently femto must be given a file to edit, and reading this )
( filename is the first thing that happens in ;startup. )
( )
( TODO: support other situations, such as: )
( - launching femto without a file name )
( - closing the given file and opening a new one )
@read-filename ( -> )
#12 DEI #0a EQU ?&execute ( did we read \n ? )
#12 DEI .tmp/pos LDZ2 STA ( no, so save in buffer )
.tmp/pos LDZ2 INC2 .tmp/pos STZ2 ( pos++ )
BRK ( return )
&execute ( we saw a newline, so do something )
#00 .tmp/pos LDZ2 STA ( null terminate str )
;filename open-file ( open file )
setup-linecount ( determine # of lines )
setup-terminal-size ( detect terminal dimensions )
BRK
( jump to beginning of line )
@bol ( -> )
#0000 .cursor/col STZ2
redraw-statusbar-and-cursor
!return
( jump to beginning of line )
@eol ( -> )
cur-len .cursor/col STZ2
redraw-statusbar-and-cursor
!return
@forward ( -> )
go-forward !return
( move forward by one character )
@go-forward ( -> )
cur-pos last-pos GTH2 ( ?return ) ?&noop
redraw-statusbar-and-cursor
cur-col cur-len LTH2 ?&normal
#0000 .cursor/col STZ2
.cursor/row LDZ2 INC2 .cursor/row STZ2
!ensure-visible-cursor
&normal
cur-col INC2 .cursor/col STZ2
&noop JMP2r
( move backward by one character )
@back ( -> )
go-back !return
( internal implementation shared by ;back and ;backspace )
@go-back ( -> )
cur-pos ;data EQU2 ?&noop
cur-col #0001 LTH2 ?&next-line
cur-col #0001 SUB2 .cursor/col STZ2
!redraw-statusbar-and-cursor
&next-line
.cursor/row LDZ2k #0001 SUB2 ROT STZ2
cur-len .cursor/col STZ2
ensure-visible-cursor
redraw-statusbar-and-cursor
&noop JMP2r
( move up by one line )
@up ( -> )
.cursor/row LDZ2 #0000 EQU2 ?return
.cursor/row LDZ2 #0001 SUB2 .cursor/row STZ2
ensure-visible-cursor
redraw-statusbar-and-cursor
!return
( move down by one line )
@down ( -> )
.cursor/row LDZ2
.buffer/line-count LDZ2 #0001 SUB2 EQU2 ?return
.cursor/row LDZ2 INC2 .cursor/row STZ2
ensure-visible-cursor
redraw-statusbar-and-cursor
!return
@is-word-char ( c^ -> bool^ )
DUP #2f GTH OVR #3a LTH AND STH
DUP #40 GTH OVR #5b LTH AND STH ORAr
DUP #60 GTH SWP #7b LTH AND STHr ORA JMP2r
@not-word-char ( c^ -> bool^ )
is-word-char #00 EQU JMP2r
@forward-by-word ( -> )
cur-pos
&first
LDAk #00 EQU ?&done
LDAk is-word-char ?&second
INC2 go-forward !&first
&second
LDAk #00 EQU ?&done
LDAk not-word-char ?&done
INC2 go-forward !&second
&done
POP2 !return
@back-by-word ( -> )
cur-pos #0001 SUB2
&first
DUP2 ;data LTH2 ?&done
LDAk is-word-char ?&second
#0001 SUB2 go-back !&first
&second
DUP2 ;data LTH2 ?&done
LDAk not-word-char ?&done
#0001 SUB2 go-back !&second
&done
POP2 !return
@help
#01 .state/in-help STZ
term-erase-all
#0000 #0000 term-move-cursor
emit-color-bold
;help-text print
emit-reset
redraw-all
BRK
( center buffer view on the current line )
@center-view
.term/rows LDZ2 INC2 #0002 DIV2 STH2k
.cursor/row LDZ2 LTH2 ?&standard
POP2r
#0000 .buffer/line-offset STZ2
;data .buffer/offset STZ2
!&done
&standard
.cursor/row LDZ2 STH2r SUB2
DUP2 .buffer/line-offset STZ2
abs-line .buffer/offset STZ2
&done
redraw-all !return
( move up by one page )
@page-up ( -> )
.term/rows LDZ2 #0002 SUB2 STH2k
.buffer/line-offset LDZ2 LTH2 ?&move-full
POP2r
zero-row
#0000 .cursor/col STZ2
!&done
&move-full
.cursor/row LDZ2 STH2kr SUB2 .cursor/row STZ2
.buffer/line-offset LDZ2 STH2r SUB2
DUP2 .buffer/line-offset STZ2
abs-line .buffer/offset STZ2
&done
redraw-all !return
( move down by one page )
@page-down
eof-is-visible ?&near-eof
.term/rows LDZ2 #0002 SUB2 STH2k
.buffer/line-offset LDZ2 ADD2
DUP2 .buffer/line-offset STZ2
abs-line .buffer/offset STZ2
.cursor/row LDZ2 STH2r ADD2 .cursor/row STZ2
redraw-all !return
&near-eof
.buffer/line-count LDZ2 #0001 SUB2 .cursor/row STZ2
cur-len .cursor/col STZ2
redraw-cursor !return
( return true if the end of the file is visible )
@eof-is-visible ( -> bool^ )
.buffer/line-offset LDZ2 .term/rows LDZ2 ADD2 INC2
.buffer/line-count LDZ2
GTH2 JMP2r
( beginning quitting femto, prompting if unsaved changes )
@quit
#01 .state/quitting STZ
.state/modified LDZ #00 EQU ?quit-now
;messages/quit-prompt ;messages/null ;do-quit start-prompt
redraw-prompt-and-cursor !return
( display two strings on the message line )
( )
( often this involves a static messages + an argument like ;tmp/data. )
( )
( use messages/null for the second string if only one is needed. )
@send-message ( s1* s2* -> )
#01 .state/message STZ
move-to-message-line
SWP2 print !print
( callback executed in response to the quit prompt. )
@do-quit
.tmp/data LDZ LIT "n EQU ?quit-now
.tmp/data LDZ LIT "y EQU ?save
#00 .state/quitting STZ
;messages/unknown-input ;tmp/data send-message
BRK
( label that calls quit! )
( )
( this definition is needed so the address can be used by JCN2. )
@quit-now quit!
( label that calls BRK )
( )
( this definition is needed so the address can be used by JCN2. )
@ignore
BRK
( insert the given character at the cursor position )
( )
( this should not be called for newlines, see ;newline )
@insert ( c^ -> )
cur-pos shift-right
cur-col INC2 .cursor/col STZ2
redraw-all !return
( insert the given character in the prompt )
@insert-prompt ( c^ -> )
.tmp/pos LDZ2 STH2k STA ( data[pos] <- c )
INC2r #00 STH2kr STA ( data[pos+1] <- 0 )
STH2r .tmp/pos STZ2 ( pos <- pos+1 )
redraw-prompt-and-cursor !return
( insert a tab at the cursor position )
( )
( depending on the state of config/insert-tabs this will )
( either call ;insert with \t or else insert a number of )
( spaces based on .config/tab-width. )
@insert-tab ( -> )
.config/insert-tabs LDZ ?&use-tabs
#0000 .config/tab-width LDZ2 SUB2
&loop
DUP2 #0000 EQU2 ?&done
#20 cur-pos shift-right
INC2 !&loop
&done
cur-col .config/tab-width LDZ2 ADD2 .cursor/col STZ2
redraw-all !return
&use-tabs
#09 !insert
( insert a newline at the cursor position )
@newline ( c^ -> )
#0a cur-pos shift-right
#0000 .cursor/col STZ2
.cursor/row LDZ2 INC2 .cursor/row STZ2
.buffer/line-count LDZ2k INC2 ROT STZ2
ensure-visible-cursor
redraw-all !return
( delete the character to the left of the cursor, if any )
@backspace ( -> )
cur-pos ;data EQU2 ?return
go-back !delete
( delete the last character in the prompt )
@backspace-prompt ( -> )
.tmp/pos LDZ2 ;tmp/data EQU2 ?&skip ( ?return )
#00 .tmp/pos LDZ2 #0001 SUB2 ( 0 pos-1 )
STH2k STA ( data[pos-1] <- 0 )
STH2r .tmp/pos STZ2 ( pos <- pos-1 )
&skip redraw-prompt-and-cursor !return
( delete the character under the cursor, if any )
@delete ( -> )
last-pos cur-pos LTH2 ?return
cur-pos LDAk STH ( cur [c] )
shift-left ( [c] )
STHr #0a NEQ ?&not-newline
.buffer/line-count LDZ2k #0001 SUB2 ROT STZ2
&not-newline redraw-all !return
( used at the start of an escape sequence to set up state. )
( )
( many keys such as page-down will actually send an escape character )
( followed by others. to support these we use saw-esc to interpret )
( input characters differently. )
( )
( see also state/saw-xterm which supports such sequences. )
@escape ( -> )
#01 .state/saw-esc STZ BRK
( move to the end of the file )
@goto-end ( -> )
.buffer/line-count LDZ2 #0001 SUB2 .cursor/row STZ2
.buffer/line-count LDZ2 .term/rows LDZ2 LTH2k ?&use-zero
SUB2 #0002 ADD2 !&continue
&use-zero
POP2 POP2 #0000
&continue
DUP2 .buffer/line-offset STZ2
abs-line .buffer/offset STZ2
cur-len .cursor/col STZ2
redraw-all !return
( move to the start of the file )
@goto-start ( -> )
zero-row
#0000 .cursor/col STZ2
redraw-all !return
( prompt for a line number and move to that line )
@goto-line ( -> )
;messages/goto-line ;messages/null ;do-goto-line start-prompt
redraw-prompt-and-cursor !return
( parse the given string as a decimal number )
( )
( returns the number as a short followed by whether parsing was ok )
@parse-decimal-number ( addr* -> n* ok^ )
LDAk ?&non-empty
#00 JMP2r
&non-empty
LIT2r 0000
&loop
LDAk ?&continue
POP2 STH2r #01 JMP2r
&continue
LDAk LIT "0 LTH ?&fail
LDAk LIT "9 GTH ?&fail
LIT2r 000a MUL2r
LDAk LIT "0 SUB #00 SWP STH2 ADD2r
INC2 !&loop
&fail
POP2r #00 JMP2r
( go to the given line number )
( )
( this is used as a callback from the goto-line prompt )
@do-goto-line ( n* -> )
;tmp/data parse-decimal-number
?&ok
;messages/unknown-input ;tmp/data send-message
!return
&ok
#0001 SUB2 ( convert 1-indexing to 0-indexing )
DUP2 .buffer/line-count LDZ2 LTH2 ?&within
POP2 !goto-end
&within
jump-to-line
redraw-all !return
( move the cursor to the given coordinates )
( )
( this won't move the display if the given coordinates are visible. )
@move-to-coord ( col* row* -> )
DUP2 line-is-visible ?jump-to-coord/short
!jump-to-coord
( move the cursor to the given coordinates )
( )
( this will always ensure the display is centered on the given coordinates )
@jump-to-coord ( x* y* -> )
.term/rows LDZ2 INC2 #0002 DIV2 LTH2k ( x y rows/2 y<rows/2? ) ?&early
OVR2 SWP2 SUB2 ( x y y-rows/2 )
.buffer/line-count LDZ2 ( x y y-rows/2 lines )
.term/rows LDZ2 SUB2 ( x y y-rows/2 lines-rows )
GTH2k ( x y y-rows/2 lines-rows y-rows/2>lines-rows? )
?&late ( x y y-rows/2 lines-rows )
POP2 !&finish
&early ( x y rows/2 )
POP2 #0000 !&finish ( x y 0000 )
&late ( x y y-rows/2 lines-rows )
NIP2
&finish ( x y o )
redraw-all
SUB2k STH2 DUP2 ( x y o o [y-o] )
.buffer/line-offset STZ2 ( x y o [y-o] )
abs-line .buffer/offset STZ2 ( x y [y-o] )
POP2r
&short
redraw-statusbar-and-cursor
.cursor/row STZ2 ( x )
.cursor/col STZ2
JMP2r
( jump to the given line number )
@jump-to-line ( n* -> )
#0000 SWP2 !jump-to-coord
( ensure the cursor is visibe )
( )
( if the cursor is not already visible the screen will be )
( centered on the cursor's coordinates. )
@ensure-visible-cursor
.cursor/row LDZ2 .buffer/line-offset LDZ2
SUB2 .term/rows LDZ2 LTH2 ?&noop
.cursor/row LDZ2 jump-to-line
redraw-all
&noop JMP2r
( currently used to print stack information. )
@debug
;messages/input-error !errorq
( move the terminal's cursor to the message line )
( )
( this low level method does not change any editor state (such as )
( the cursor) but is used to display messages. )
@move-to-message-line ( -> )
#0000 .term/rows LDZ2 #0002 ADD2 !term-move-cursor
( start a prompt on the message line )
( )
( the arguments are as follows: )
( - the prompt string will printed in bold )
( - the default string will be editable )
( - the vector address will be used on return )
( )
( prompts can always be cancelled using C-g. )
( )
( when called vector should end in a BRK instructinon. )
@start-prompt ( prompt* default* vector* -> )
.prompt/active LDZ ?&is-active
#01 .prompt/active STZ ( prompt/active <- 1 )
.prompt/vector STZ2 ( prompt/vector <- vector )
;tmp/data str-copy ( tmp/data <- default )
;tmp/data ADD2 .tmp/pos STZ2 ( tmp/pos <- len(default)+data )
.prompt/string STZ2 ( prompt/string <- prompt )
JMP2r
&is-active
#0000 DIV
( ends prompt without calling vector )
@cancel-prompt ( -> )
#00 .prompt/active STZ
#00 .state/quitting STZ
clear-message-line
redraw-prompt-and-cursor
!return
( finishes prompt and executes callback )
( )
( when called vector should end in a BRK instruction )
@finish-prompt ( -> )
#00 .prompt/active STZ
clear-message-line
redraw-prompt-and-cursor
.prompt/vector LDZ2 JMP2
( begin saving the file, prompting the user for a fiel name )
@save
;messages/save-prompt ;filename ;do-save start-prompt
redraw-prompt-and-cursor
!return
( save the file with the filename found in tmp/data )
@do-save ( -> )
.buffer/limit LDZ2 ;data SUB2 STH2 ( [size] )
;tmp/data .File/name DEO2
STH2kr .File/length DEO2
;data .File/write DEO2
.File/success DEI2 STH2r EQU2 ?&ok
;messages/save-failed !&finish
&ok
#00 .state/modified STZ
;tmp/data ;filename str-copy POP2
;messages/save-ok
&finish
;tmp/data send-message
.state/quitting LDZ ?quit-now
#03 .state/redraw STZ ( FIXME: why do we have to do this? )
!return
( begin a search, prompting for a search string )
@search ( -> )
;messages/search-prompt ;messages/null ;do-search start-prompt
redraw-prompt-and-cursor
!return
( execute a search, using the given search string )
@do-search ( -> )
.cursor/row LDZ2 .searching/orig-row STZ2
.cursor/col LDZ2 .searching/orig-col STZ2
#0000 .searching/regex STZ2
move-to-next-match ?&found
move-to-prev-match ?&found
;messages/no-matches-found ;tmp/data send-message BRK
&found
#01 .searching/active STZ
redraw-matches
!return
( begin a search, prompting for a regular expression )
@regex-search ( -> )
;messages/regex-search-prompt ;messages/null ;do-regex-search start-prompt
redraw-prompt-and-cursor !return
( execute a search, using the given regular expressions )
( )
( TODO: handle invalid regular expressions that fail to compile )
@do-regex-search ( -> )
cur-pos DUP2 .searching/start STZ2 .searching/end STZ2
.cursor/row LDZ2 .searching/orig-row STZ2
.cursor/col LDZ2 .searching/orig-col STZ2
;tmp/data compile .searching/regex STZ2
move-to-next-regex-match ?&found
move-to-prev-regex-match ?&found
;messages/no-matches-found ;tmp/data send-message BRK
&found
#01 .searching/active STZ
redraw-matches
!return
( toggle the color used by the terminal )
( )
( available colors are: )
( - black )
( - red )
( - green )
( - yellow )
( - blue )
( - magenta )
( - cyan )
( - white )
@toggle-color ( -> )
.config/color LDZ2 #3733 EQU2 ?{
.config/color LDZ2 #0100 ADD2 DUP2 .config/color STZ2
DUP2 #3733 LTH2 ?{ .config/red STZ2 !&done }
POP2 #3133 .config/red STZ2 !&done
}
#3033 DUP2 .config/color STZ2 .config/red STZ2
&done redraw-all !return
( toggle whether to use literal tab characters )
( )
( when opening a file, this defaults to 01 if existing tab )
( characters are found, and 00 otherwise. )
@toggle-tabs ( -> )
.config/insert-tabs LDZk #00 EQU SWP STZ
redraw-statusbar-and-cursor !return
( interpret user input as an escaped sequence )
( )
( called by on-key with state/saw-esc is true )
( )
( TODO: maybe M-% for search&replace )
@on-key-escaped ( -> )
#00 .state/saw-esc STZ
.state/key LDZ LIT "< EQU ( M-< ) ?goto-start
.state/key LDZ LIT "> EQU ( M-> ) ?goto-end
.state/key LDZ LIT "b EQU ( M-b ) ?back-by-word
.state/key LDZ LIT "c EQU ( M-c ) ?toggle-color
.state/key LDZ LIT "f EQU ( M-f ) ?forward-by-word
.state/key LDZ LIT "g EQU ( M-g ) ?goto-line
.state/key LDZ LIT "h EQU ( M-h ) ?help
.state/key LDZ LIT "s EQU ( M-s ) ?regex-search
.state/key LDZ LIT "t EQU ( M-t ) ?toggle-tabs
.state/key LDZ LIT "u EQU ( M-u ) ?undo
.state/key LDZ LIT "v EQU ( M-v ) ?page-up
.state/key LDZ LIT "[ EQU ( M-[ ) ?xterm
BRK
( set our input to expect xterm control sequences )
( )
( after seeing ESC followed by [ we expect various )
( ANSI or xterm control sequences. these include )
( things like: )
( - up/down/left/right arrow keys )
( - page up/page down keys )
( - end/home keys )
@xterm
#01 .state/saw-xterm STZ BRK
( after seeing sequences like "ESC [ 1" we expect )
( to see a trailing ~ to complete the sequence. )
( )
( this callback checks for and if set performs )
( the relevant action. )
@on-key-vt ( -> )
.state/saw-vt LDZk STH #00 SWP STZ
.state/key LDZ LIT "~ EQU ?&ok
POPr BRK
&ok
STHr DUP LIT "1 NEQ ?&not-1
( ^[[1~ -> home ) POP !bol
&not-1 DUP LIT "2 NEQ ?&not-2
( ^[[2~ -> insert ) POP BRK
&not-2 DUP LIT "3 NEQ ?&not-3
( ^[[3~ -> delete ) POP !delete
&not-3 DUP LIT "4 NEQ ?&not-4
( ^[[4~ -> end ) POP !eol
&not-4 DUP LIT "5 NEQ ?&not-5
( ^[[5~ -> page up ) POP !page-up
&not-5 DUP LIT "6 NEQ ?&not-6
( ^[[6~ -> page down ) POP !page-down
&not-6 DUP LIT "7 NEQ ?&not-7
( ^[[7~ -> home ) POP !bol
&not-7 DUP LIT "8 NEQ ?&not-8
( ^[[8~ -> end ) POP !eol
&not-8
( ??? ) POP BRK
( after seeing sequences like "ESC [" we expect )
( to see more characters to determine the logical key. )
( )
( this callback performs the relevant action, )
( or else sets (or unsets) state as necessary )
( to continue (or end) the sequence. )
@on-key-xterm ( -> )
#00 .state/saw-xterm STZ
.state/key LDZ LIT "A EQU ( ^[[A -> up ) ?up
.state/key LDZ LIT "B EQU ( ^[[B -> down ) ?down
.state/key LDZ LIT "C EQU ( ^[[C -> right ) ?forward
.state/key LDZ LIT "D EQU ( ^[[D -> left ) ?back
.state/key LDZ LIT "F EQU ( ^[[F -> end ) ?eol
.state/key LDZ LIT "H EQU ( ^[[H -> home ) ?bol
.state/key LDZ LIT "0 LTH ?ignore
.state/key LDZ LIT "8 GTH ?ignore
.state/key LDZ .state/saw-vt STZ ( ^[[1 through ^[[8 )
BRK
( clear the message line )
( )
( this includes the code needed to move the cursor )
( to that line, the ANSI control sequence to clear )
( the line, and unsetting state/message. )
( )
( if state/message is unset this is a no-op. )
@clear-message-line
.state/message LDZ #00 EQU ?&done
move-to-message-line
term-erase-line
#00 .state/message STZ
&done JMP2r
( cancel the active search )
( )
( this method unsets searching/active and also restores )
( the original cursor position. )
@cancel-search
.searching/orig-row LDZ2 jump-to-line
.searching/orig-col LDZ2 .cursor/col STZ2
!finish-search
( cancel the active search )
( )
( this method unsets searching/active. unlike ;cancel-search )
( this leaves the cursor where it is. )
@finish-search
#00 .searching/active STZ
reset-arena redraw-all !return
( TODO: i haven't decided how to solve the problem of )
( overlapping matches yet. i don't really want to maintain )
( a global list of all matches, which means that currently )
( it can change in response to e.g. cursor position when )
( matches overlap. )
( )
( UPDATE: now that we have searching/start and searching/end )
( we can use those to resume the search after the full match. )
( this solves the problem except in some very strange cases )
( which are quite unlikely. )
( jump forward to the next match, if any. )
( )
( moves the cursor forward to the next match. if there are no )
( further matches the cursor does not move. )
@jump-to-next-match ( -> )
.searching/regex LDZ2 ORA ?&is-regex
move-to-next-match POP !return
&is-regex
move-to-next-regex-match POP !return
( jump backward to the previous match, if any. )
( )
( moves the cursor backward to the previous match. if there are )
( no further matches the cursor does not move. )
@jump-to-prev-match ( -> )
.searching/regex LDZ2 ORA ?&is-regex
move-to-prev-match POP !return
&is-regex
move-to-prev-regex-match POP !return
( move to the next substring match. )
( )
( called by ;jump-to-next-match. )
@move-to-next-match ( -> ok^ )
.buffer/limit LDZ2
cur-pos INC2
&loop
GTH2k #00 EQU ?&fail
DUP2 matches-at
ORA ?&found
INC2 !&loop
&found
NIP2 jump-to-pos #01 JMP2r
&fail
POP2 POP2 #00 JMP2r
( move to the previous substring match. )
( )
( called by ;jump-to-prev-match. )
@move-to-prev-match ( -> ok^ )
;data
cur-pos #0001 SUB2
&loop
GTH2k ?&fail
DUP2 matches-at
ORA ?&found
#0001 SUB2 !&loop
&found
NIP2 jump-to-pos #01 JMP2r
&fail
POP2 POP2 #00 JMP2r
( move to the next regex match. )
( )
( called by ;jump-to-next-match. )
@move-to-next-regex-match ( -> ok^ )
.searching/end LDZ2 .buffer/limit LDZ2 OVR2
GTH2 ?&ok
POP2 #00 JMP2r
&ok
.searching/regex LDZ2 rx-search ?&found
#00 JMP2r
&found
;search-end LDA2 .searching/end STZ2
;search-start LDA2 DUP2 .searching/start STZ2
jump-to-pos #01 JMP2r
( move to the previous substring match. )
( )
( called by ;jump-to-prev-match. )
( )
( compared to move-to-next-regex-match this is kind of inefficient. )
( that's because we have no easy way to search backwards from a point. )
( )
( we could do some kind of fancy thing where we search the previous )
( N bytes, then the 2N bytes before that, etc. )
( )
( however, 64K is small enough that just searching from the beginning )
( and then taking the last match before the cursor works. )
@move-to-prev-regex-match ( -> ok^ )
LITr 00
cur-pos ;data ( limit pos [res] )
&loop ( limit pos [res] )
GTH2k #00 EQU ?&done ( limit pos )
DUP2 .searching/regex LDZ2 rx-search ( limit pos match? )
#00 EQU ?&done ( limit pos )
OVR2 ;search-end LDA2 LTH2 ?&done
POP2 POPr LITr 01
;search-start LDA2 .searching/start STZ2
;search-end LDA2 DUP2 .searching/end STZ2
!&loop
&done
POP2 POP2 STHr DUP #00 EQU ?&fail
.searching/start LDZ2 jump-to-pos
&fail
JMP2r
( on-key event handler to use when searching )
( )
( when searching the user can: )
( - move to the next match (n or C-s) )
( - move to the previous match (p or C-r) )
( - end the search leaving the cursor where it is (enter) )
( - cancel the search restoring the cursor (C-g) )
@on-key-searching
.state/key LDZ #07 EQU ( C-g ) ?cancel-search
.state/key LDZ #08 EQU ( C-h ) ?help
.state/key LDZ #0d EQU ( \r ) ?finish-search
.state/key LDZ #12 EQU ( C-r ) ?jump-to-prev-match
.state/key LDZ #13 EQU ( C-s ) ?jump-to-next-match
.state/key LDZ #6e EQU ( n ) ?jump-to-next-match
.state/key LDZ #70 EQU ( p ) ?jump-to-prev-match
!ignore
( on-key event handler to use when prompt is active )
( )
( when the prompt is active the user can: )
( - append characters to the input string )
( - delete from the end of the input string (backspace) )
( - complete the input and act (enter) )
( - cancel the prompt without action (C-g) )
( )
( TODO: currently it's impossible to edit the prompt )
( except from the end. ideally we'd support most of the )
( same navigation commands as we do in the buffer, such as )
( C-a, C-d, etc. however, it's enough extra work to enable )
( this that for now i haven't done it. )
@on-key-prompt
.state/key LDZ #07 EQU ( C-g ) ?cancel-prompt
.state/key LDZ #08 EQU ( C-h ) ?help
.state/key LDZ #0d EQU ( \r ) ?finish-prompt
.state/key LDZ #7f EQU ( DEL ) ?backspace-prompt
.state/key LDZ #20 LTH ?ignore ( ignore for now )
.state/key LDZ #7e GTH ?ignore ( ignore for now )
.state/key LDZ ( printable ASCII ) !insert-prompt
BRK
( on-key event handler )
( )
( this is the "normal" event handler to use for editing )
( the buffer. it checks various state values to determine )
( if we're in the midst of a control sequence, if we're )
( searching or have an active prompt, etc. )
( )
( TODO: C-h for help )
( )
( you could also imagine building data structures of )
( commands to unify input strings, help text, callbacks, )
( and so on. this might ultimately be more efficient but )
( for now what we have works. )
@on-key
#00 .state/in-undo STZ
.Console/read DEI .state/key STZ
clear-message-line
.state/in-help LDZ #00 .state/in-help STZ ?return
.searching/active LDZ ?on-key-searching
.prompt/active LDZ ?on-key-prompt
.state/saw-vt LDZ ?on-key-vt
.state/saw-xterm LDZ ?on-key-xterm
.state/saw-esc LDZ ?on-key-escaped
.state/key LDZ #01 EQU ( C-a ) ?bol
.state/key LDZ #02 EQU ( C-b ) ?back
.state/key LDZ #04 EQU ( C-d ) ?delete
.state/key LDZ #05 EQU ( C-e ) ?eol
.state/key LDZ #06 EQU ( C-f ) ?forward
.state/key LDZ #08 EQU ( C-h ) ?help
.state/key LDZ #09 EQU ( \t ) ?insert-tab
.state/key LDZ #0c EQU ( C-l ) ?center-view
.state/key LDZ #0d EQU ( \r ) ?newline
.state/key LDZ #0e EQU ( C-n ) ?down
.state/key LDZ #0f EQU ( C-o ) ?save
.state/key LDZ #10 EQU ( C-p ) ?up
.state/key LDZ #13 EQU ( C-s ) ?search
.state/key LDZ #16 EQU ( C-v ) ?page-down
.state/key LDZ #18 EQU ( C-x ) ?quit
.state/key LDZ #1a EQU ( C-z ) ?debug
.state/key LDZ #1b EQU ( ESC ) ?escape
.state/key LDZ #7f EQU ( DEL ) ?backspace
.state/key LDZ #20 LTH ?ignore ( ignore for now )
.state/key LDZ #7e GTH ?ignore ( ignore for now )
.state/key LDZ ( printable ASCII ) !insert
( return the smaller of two short values )
@min2 ( x* y* -> min* )
LTH2k JMP SWP2 POP2 JMP2r
( method to add bits to the redraw register )
( )
( state/redraw uses 8 bits to represent which parts )
( of the screen (if any) should be redrawn. this method )
( uses logical-or (ORA) to add the bits of n to those )
( already set. )
@redraw-add ( n^ -> )
.state/redraw LDZk ROT ORA SWP STZ JMP2r
( various redrawing methods )
( )
( these don't perform a redraw right away, but instead )
( signal that the next drawing should include that part. )
@redraw-cursor ( -> ) #01 !redraw-add
@redraw-statusbar-and-cursor ( -> ) #03 !redraw-add
@redraw-prompt-and-cursor ( -> ) #05 !redraw-add
@redraw-matches ( -> ) #08 !redraw-add
@redraw-all ( -> ) #1f !redraw-add
( draw the current cursor location )
@draw-cursor ( -> )
.prompt/active LDZ #00 EQU JMP JMP2r
( TODO: handle long lines )
cur-w-col lmargin ADD2
.cursor/row LDZ2 .buffer/line-offset LDZ2 SUB2
!term-move-cursor
( current column in terms of display width )
( )
( this is different than ;cur-col due to tabs )
@cur-w-col ( -> col* )
LIT2r 0000 ( [0] )
cur-line DUP2 cur-col ADD2 SWP2 ( lim s [0] )
&loop GTH2k ?&next
POP2 POP2 STH2r JMP2r
&next LDAk #09 EQU ?&tabs INC2 INC2r !&loop
&tabs INC2 .config/tab-width LDZ2 STH2 ADD2r !&loop
( move the terminal cursor to the statusbar line )
@move-to-statusbar ( -> )
#0000 .term/rows LDZ2 !term-move-cursor
( draw the full statusbar )
@draw-statusbar ( -> )
move-to-statusbar
emit-color-reverse
LIT2r 2018 .term/cols LDZ2 #0001 ( cols i [2018] )
&loop LTH2k ?&done DEOkr INC2 !&loop
&done POP2 POP2 POP2r ( )
move-to-statusbar
( display ** if the buffer has unsaved changes, -- otherwise )
#2d .state/modified LDZ #00 NEQ #03 MUL SUB DUP emit emit sp
;filename print
sp emit-[
.buffer/limit LDZ2 ;data SUB2 emit-dec2
;messages/bytes print
sp
.buffer/line-count LDZ2 emit-dec2
;messages/lines print
sp emit-lpar
cur-col INC2 emit-dec2
emit-,
.cursor/row LDZ2 INC2 emit-dec2
emit-rpar sp emit-[
LIT "s .config/insert-tabs LDZ ADD emit
emit-] sp
;messages/help-msg print
!emit-reset
@draw-prompt ( -> )
clear-message-line
.prompt/active LDZ ?&is-active
JMP2r
&is-active
#01 .state/message STZ
move-to-message-line
emit-color-bold
.prompt/string LDZ2 print
emit-reset
;tmp/data print
JMP2r
@draw-linenum ( n* -> )
emit-reset
emit-color
emit-dec2-pad sp
!emit-reset
@matches-at ( s* -> limit* )
LIT2r :tmp/data
&loop LDAkr STHr #00 EQU ?&done
LDAk LDAkr STHr NEQ ?&fail
INC2 INC2r !&loop
&fail POP2 #0000
&done POP2r JMP2r
( TODO: this doesn't handle tabs correctly )
@draw-region ( offset* limit* col* row* -> )
OVR2 ( offset limit col row col )
.term/cols LDZ2 SWP2 SUB2 STH2 ( offset limit col row [cols-col] )
term-move-cursor ( offset limit [cols-col] )
OVR2 STH2r ADD2 ( offset limit offset+cols-col )
min2 STH2 ( offset [cutoff] )
&loop ( i [cutoff] )
DUP2 STH2kr LTH2 #00 EQU ?&done
LDAk #00 EQU ?&done
LDAk #18 DEO INC2 !&loop
&done
POP2 POP2r JMP2r
@screen-limit ( -> sc-limit* )
.term/rows LDZ2 .buffer/line-offset LDZ2 ADD2 ( row0+rows )
DUP2 .buffer/line-count LDZ2 LTH2 ?&not-end
POP2 .buffer/limit LDZ2 JMP2r
&not-end
!abs-line
@draw-regex-matches ( -> )
emit-color-reverse-bold ( )
screen-limit .buffer/offset LDZ2 ( limit pos )
&loop ( limit pos )
GTH2k #00 EQU ( limit pos limit>pos=0? )
?&done ( limit pos )
DUP2 .searching/regex LDZ2 ( limit pos pos rx )
rx-search #00 EQU ( limit pos found=0? )
?&done ( limit pos )
POP2 ;search-start LDA2 ( limit start )
GTH2k #00 EQU ( limit start limit>start=0? )
?&done ( limit start )
;search-end LDA2 OVR2 ( limit start end start )
pos-to-row-col ( limit start end row col )
lmargin ADD2 ( limit start end row col+lm )
SWP2 .buffer/line-offset LDZ2 SUB2 ( limit start end col+lm row-lo )
draw-region ( limit )
;search-end LDA2 ( limit end ) !&loop
&done ( limit pos )
POP2 POP2 JMP2r
@draw-matches ( -> )
( return if not searching )
.searching/active LDZ #00 EQU ?&return ( )
.searching/regex LDZ2 ORA ?draw-regex-matches
emit-color-reverse-bold
lmargin ,&x STR2 #0000 ,&y STR2 ( x <- 0, y <- 0 )
.buffer/offset LDZ2 DUP2
screen-limit SUB2 STH2 ( offset [-count] )
&loop ( offset [-count] )
STH2kr #0000 EQU2 ?&done
DUP2 matches-at ( offset mlim [-count] )
DUP2 ORA ?&found
POP2 ( offset [-count] )
LDAk #0a EQU ?&newline
draw-matches/count-tabs
#0001 !&next ( offset n [-count] )
&found ( offset mlim [-count] )
STH2k ( offset mlim [mlim -count] )
OVR2 SWP2 ,&x LDR2 ,&y LDR2 ( offset offset mlim x y [mlim -count] )
draw-region ( offset [mlim -count] )
STH2r ( offset mlim [-count] )
OVR2 SUB2 ( offset mlim-offset [-count] )
&next ( offset n [-count] )
DUP2 ,&x LDR2 ADD2 ,&x STR2 ( offset n [-count )
STH2k ( offset n [n -count] )
ADD2 ADD2r ( offset+n [n-count] )
!&loop
&newline ( offset [-count] )
lmargin ,&x STR2
,&y LDR2 INC2 ,&y STR2
INC2 INC2r
!&loop
&done
POP2 POP2r
emit-reset
&return
JMP2r
[ &x $2 &y $2 ]
&count-tabs ( offset -> offset )
LDAk #09 NEQ ?&count-tabs/done
,&x LDR2 .config/tab-adjust LDZ2 ADD2 ,&x STR2
&count-tabs/done JMP2r
@emit-tab ( -> )
#0000 .config/tab-width LDZ2 SUB2
LIT2r 2018
&loop ORAk ?&next POP2 POP2r JMP2r
&next DEOkr INC2 !&loop
( ANSI terminal notes )
( )
( attrs [0-7] )
( reset, bright, dim, underscore, )
( blink, ???, reverse, hidden )
( )
( fg [30-37], bg [40-47] )
( black, red, green, yellow, )
( blue, magenta, cyan, white )
( ANSI control sequence to move the cursor to the given coord )
( ESC [ $row ; $col H )
@term-move-cursor ( col* row* -> )
ansi INC2 ( row+1 ) emit-dec2
emit-; INC2 ( col+1 ) emit-dec2
emit-H JMP2r
( ANSI control sequence to move N positions right )
( ESC [ $n C )
@term-move-right ( n* -> )
ansi emit-dec2 emit-C JMP2r
( ANSI control sequence to get the cursor position )
( ESC [ 6 n )
@term-get-cursor-position ( -> )
LIT2 00 "n LIT "6 !ansi-emit
( ANSI control sequence to erase entire screen )
( ESC [ 2 J )
@term-erase-all ( -> )
LIT2 00 "J LIT "2 !ansi-emit
( ANSI control sequence to erase the current line )
( ESC [ 2 K )
@term-erase-line ( -> )
LIT2 00 "K LIT "2 !ansi-emit
@ansi-emit ( 00 cn ... c1 c0 -> )
LITr 18 ( Console/write )
#5b1b STHkr DEO STHkr DEO ( ESC [ )
&loop DUP ?&next POP POPr JMP2r
&next STHkr DEO !&loop
( ESC [ 3 1 m )
@emit-red ( -> )
LIT2 00 "m .config/red LDZ2 !ansi-emit
( ESC [ 0 m )
@emit-reset ( -> )
#00 LIT2 "m "0 !ansi-emit
( ESC [ 1 m $ ESC [ 0 m )
@emit-red-dollar ( -> )
emit-red emit-$ !emit-reset
( ESC [ 3 $x ; 7 m )
( $x is 0-7 )
@emit-color-reverse ( -> )
LIT2 00 "m LIT2 "7 "; .config/color LDZ2 !ansi-emit
@emit-color ( -> )
LIT2 00 "m .config/color LDZ2 !ansi-emit
( ESC [ 3 $x ; 1 m )
( $x is 0-7 )
@emit-color-bold ( -> )
LIT2 00 "m LIT2 "1 "; .config/color LDZ2 !ansi-emit
( ESC [ 3 $x ; 1 ; 7 m )
( $x is 0-7 )
@emit-color-reverse-bold ( -> )
LIT2 00 "m LIT2 "7 "; LIT2 "1 "; .config/color LDZ2 !ansi-emit
@draw-all ( -> )
term-erase-all
#0000 #0000 term-move-cursor
.buffer/line-offset LDZ2 STH2 LIT2r 0001 ( [k line-offset] )
.buffer/offset LDZ2
&bol
ADD2kr STH2r draw-linenum
lmargin INC2 ,&x STR2
&loop ( offset [k line-offset] )
LDAk #00 EQU ?&eof
LDAk #0a EQU ?&eol
,&x LDR2 .term/cols LDZ2
LTH2k ?&ok
GTH2 ?&skip
emit-red-dollar ,&x LDR2 INC2 ,&x STR2
&skip INC2
!&loop
&ok POP2 POP2
LDAk #09 EQU ?&do-tab
LDAk emit INC2 ,&x LDR2 INC2 ,&x STR2
!&loop
&eol INC2r
STH2kr .term/rows LDZ2 GTH2 ?&done
crlf INC2 !&bol
&do-tab emit-tab INC2
.config/tab-width LDZ2 ,&x LDR2 ADD2 ,&x STR2
!&loop
[ &x $2 ]
&eof
emit-red
&eof-loop
STH2kr .term/rows LDZ2 GTH2 ?&done
crlf
lmargin term-move-right
emit-~ INC2r
!&eof-loop
&done POP2 POP2r POP2r
emit-reset
draw-matches
draw-statusbar
draw-prompt
!draw-cursor
( handler completion code to do necessary drawing and BRK )
@return ( -> )
.state/redraw LDZ
DUP #10 AND ?&draw-all
DUP #08 AND ?&do-8 !&skip-8 &do-8 draw-matches
&skip-8 DUP #04 AND ?&do-4 !&skip-4 &do-4 draw-prompt
&skip-4 DUP #02 AND ?&do-2 !&skip-2 &do-2 draw-statusbar
&skip-2 DUP #01 AND ?&do-1 !&finish &do-1 draw-cursor !&finish
&draw-all draw-all
&finish POP #00 .state/redraw STZ BRK
@str-copy ( src* dst* -> len* )
STH2 DUP2 ( src src [dst] )
&loop LDAk #00 EQU ?&done
LDAk STH2kr STA
INC2 INC2r !&loop
&done ( src src+n [dst+n] )
SWP2 SUB2
#00 STH2r STA
JMP2r
@print ( s* -> )
&loop LDAk #00 EQU ?&eof
LDAk #18 DEO INC2 !&loop
&eof POP2 JMP2r
@cur-len ( -> n* )
cur-line !line-len
@line-len ( s* -> n* )
#0000 STH2
&loop LDAk #00 EQU ?&end
LDAk #0a EQU ?&end
INC2 INC2r !&loop
&end POP2 STH2r JMP2r
@line-is-visible ( n* -> bool^ )
.buffer/line-offset LDZ2 LTH2k ?&no
.term/rows LDZ2 ADD2 LTH2 JMP2r
&no POP2 POP2 #00 JMP2r
@jump-to-pos ( s* -> )
pos-to-logical-row-col SWP2 !move-to-coord
@pos-to-display-row-col ( s* -> row* col* )
.config/tab-width LDZ2 ;pos-to-row-col/tab-width STA2 !pos-to-row-col
@pos-to-logical-row-col ( s* -> row* col* )
#0001 ;pos-to-row-col/tab-width STA2 ( fall-through )
@pos-to-row-col ( s* -> row* col* )
#0000 ,&row STR2
#0000 ,&col STR2
;data
&loop ( s pos )
GTH2k #00 EQU ?&done
LDAk #0a EQU ?&newline
LDAk #09 EQU ?&tab
#0001
&inc
,&col LDR2 ADD2 ,&col STR2
INC2 !&loop
&newline
#0000 ,&col STR2
,&row LDR2 INC2 ,&row STR2
INC2 !&loop
&tab
LIT2 [ &tab-width $2 ] !&inc
&done
POP2 POP2
,&row LDR2 ,&col LDR2 JMP2r
[ &row $2 &col $2 ]
( counts y lines forward from the given address )
@line-to-pos ( addr* y* -> s* )
#0000 SWP2 SUB2 STH2 ( addr [-y] )
&newline ( addr [-y] )
STH2kr ORA ?&loop !&done
&loop ( addr [-y] )
LDAk #00 EQU ?&not-found ( addr [-y] )
LDAk #0a EQU ?&found ( addr [-y] )
INC2 !&loop ( addr+1 [-y] )
&found INC2 INC2r !&newline
&done POP2r JMP2r
&not-found POP2 POP2r #0000 JMP2r
( find string pointer for absolute y coordinate )
@abs-line ( y* -> s* )
;data SWP2 !line-to-pos
( return a pointer to the current line )
@cur-line ( -> s* )
.cursor/row LDZ2 .buffer/line-offset LDZ2 LTH2k ?&early
( if cursor/row is later than line-offset )
( we can save some time by starting at )
( buffer/offset instead of the beginning )
SUB2 .buffer/offset LDZ2 SWP2 !line-to-pos
&early
( if cursor/row is earlier than line-offset )
( we need to use the absolute y coordinate )
POP2 !abs-line
( return a pointer to the current cursor position )
@cur-pos ( -> s* )
cur-line cur-col ADD2 JMP2r
( insert one character at the cursor position )
@shift-right ( c^ addr* -> )
#01 .state/modified STZ
ROT STH ( addr [prev^] )
last-pos SWP2 ( last addr [prev^] )
.state/in-undo LDZ ?&loop
STH2k #00 STH2r u-push
&loop LTH2k ?&done ( last addr [prev^] )
LDAk STH SWPr ( last addr [prev^ curr^] )
DUP2 STHr ( last addr addr prev^ [curr^] )
ROT ROT STA ( last addr [curr^] )
INC2 !&loop ( last addr+1 [curr^] )
&done NIP2 DUP2 ( addr addr [prev^] )
STHr ROT ROT ( addr prev^ addr )
STA INC2 ( addr+1 )
.buffer/limit STZ2 ( )
JMP2r
( remove one character at the cursor position )
( )
( TODO: change last/addr order and GTH -> LTH to remove hack )
@shift-left ( addr* -> )
#01 .state/modified STZ
last-pos SWP2 ( last addr )
.state/in-undo LDZ ?&loop
STH2k cur-pos LDA STH2r u-push
&loop GTH2k ?&next ( last addr )
!&done ( last addr )
&next DUP2 INC2 LDAk ( last addr addr+1 c1^ )
STH SWP2 STHr ( last addr+1 addr c1^ )
ROT ROT ( last addr+1 c1^ addr )
STA !&loop ( last addr+1 )
&done POP2 ( last )
.buffer/limit STZ2 ( )
#00 .buffer/limit LDZ2 STA ( ensure null termination )
JMP2r
( current column in terms of bytes in buffer )
@cur-col ( -> col* )
.cursor/col LDZ2 cur-len !min2
( jump to the first line in the buffer )
@zero-row ( -> )
;data .buffer/offset STZ2
#0000 .buffer/line-offset STZ2
#0000 .cursor/row STZ2
JMP2r
( return the location of the last character in the buffer )
@last-pos ( -> addr* )
.buffer/limit LDZ2 #0001 SUB2 JMP2r
( emit a short as a decimal )
@emit-dec2 ( n* -> )
LITr 00 ( n [0] )
&read ( n [k] )
#000a DIV2k STH2k MUL2 SUB2 STH2r INCr ( n%10 n/10 [k+1] )
DUP2 ORA ?&read
POP2 ( top element was 0000 )
&write ( n0 n1 ... nk [k+1] )
NIP #30 ADD #18 DEO LITr 01 SUBr ( n0 ... n{k-1} [k] )
STHkr ?&write
POPr JMP2r
( emit a short as a decimal with leading spaces )
@emit-dec2-pad ( n* -> )
LITr 00 ( n [0] )
&read ( n [k] )
#000a DIV2k STH2k MUL2 SUB2 STH2r INCr ( n%10 n/10 [k+1] )
STHkr #05 LTH ?&read
POP2 ( top element was 0000 )
&write0 ( n0 n1 ... nk [k+1] )
DUP2 ORA ?emit-dec2/write
POP2 sp LITr 01 SUBr
STHkr ?&write0
POPr JMP2r
( various string constants used as messages for the user )
@messages [ &null 00
&input-error "Input 20 "error, 20 "file 20 "too 20 "large: 20 00
&bytes 20 "bytes, 00
&save-ok "Successfully 20 "saved 20 00
&save-failed "Failed 20 "to 20 "save 20 00
&lines 20 "lines] 00
&goto-line "Go 20 "to 20 "line: 20 00
&save-prompt "File 20 "Name 20 "to 20 "Write: 20 00
&search-prompt "Text 20 "to 20 "Search 20 "for: 20 00
&regex-search-prompt "Regex 20 "to 20 "Search 20 "for: 20 00
&quit-prompt "Save 20 "modified 20 "file 20 "(y/n)? 20 00
&unknown-input "Unknown 20 "input: 20 00
&no-matches-found "No 20 "matches 20 "found: 20 00
&term-size-parse-error "Error 20 "parsing 20 "term 20 "size 00
&help-msg "(help: 20 "C-h) 00
]
@help-text
09 "femto 20 "input 20 "reference 09 "(C 20 "is 20 "Ctrl, 20 "M 20 "is 20 "Meta/Alt ") 0d 0a
0d 0a
09 "quit 09 09 "C-x 09 09 "cancel 09 09 "C-g 0d 0a
09 "save 09 09 "C-o 09 09 "undo 09 09 "C-u 0d 0a
0d 0a
09 "move 20 "up 09 09 "C-p 20 "(up) 09 "page 20 "up 09 09 "M-v 20 "(pg-up) 0d 0a
09 "move 20 "down 09 "C-n 20 "(down) 09 "page 20 "down 09 "C-v 20 "(pg-dn) 0d 0a
09 "move 20 "left 09 "C-b 20 "(left) 09 "line 20 "start 09 "C-a 20 "(home) 0d 0a
09 "move 20 "right 09 "C-f 20 "(right) 09 "line 20 "end 09 "C-e 20 "(end) 0d 0a
0d 0a
09 "goto 20 "file 20 "start 09 "M-< 09 09 "left 20 "by 20 "word 09 "M-b 0d 0a
09 "goto 20 "file 20 "end 09 "M-> 09 09 "right 20 "by 20 "word 09 "M-f 0d 0a
09 "goto 20 "line 09 "M-g 09 09 "center 20 "cursor 09 "C-l 0d 0a
0d 0a
09 "search 09 09 "C-s 09 09 "toggle 20 "colors 09 "M-c 0d 0a
09 "regex 20 "search 09 "M-s 09 09 "toggle 20 "tabs 09 "M-t 0d 0a
09 "next 20 "match 09 "C-s 20 "(n) 0d 0a
09 "prev 20 "match 09 "C-r 20 "(p) 0d 0a
09 "end 20 "search 09 "enter 0d 0a
09 "cancel 20 "search 09 "C-g 0d 0a
0d 0a
09 09 09 "press 20 "any 20 "key 20 "to 20 "continue... 0d 0a
00
( perform the undo action )
@undo ( -> )
#01 .state/in-undo STZ
;undo-stack/pos LDA2 ;undo-stack/data EQU2 ?&noop
;undo-stack/pos LDA2 #0003 SUB2
DUP2 ;undo-stack/pos STA2
LDA2k STH2 ( pos [addr] )
INC2 INC2 LDA STH2r ( c addr )
jump-to-pos
DUP #00 EQU ?&delete
DUP #0a EQU ?&newline
DUP #09 EQU ?&tab
!insert
&newline POP !newline
&tab POP !insert-tab
&delete POP !delete
&noop BRK
( free up space in the undo stack by evicting the oldest entry )
@u-free ( -> )
;undo-stack/data STH2k #0003 ADD2 ( st+3 [st] )
&loop LDAk STH2kr STA
INC2 INC2r
DUP2 ;undo-stack/pos LDA2 LTH2 ?&loop
;undo-stack/pos LDA2k #0003 SUB2 SWP2 STA2
POP2 POP2r JMP2r
( push a new item on the undo stack )
@u-push ( c^ addr* -> )
;undo-stack/pos DUP2 LDA2 ( c^ addr* top* pos* )
GTH2 ( c^ addr* top>pos^ ) ?&has-room ( c^ addr* )
u-free
&has-room ;undo-stack/pos LDA2 ( c^ addr* pos* )
STH2k ( c addr pos [pos] )
STA2 ( c [pos] )
STH2r INC2 INC2 STH2k ( c pos+2 [pos+2] )
STA ( [pos+2] )
STH2r INC2 ( pos+3 ) ;undo-stack/pos STA2 ( [] )
JMP2r
( path to file being edited )
@filename $80
( stack of data to undo )
( )
( each item in the stack consists of: )
( - 2 bytes: address to jump to )
( - 1 byte: character to insert, or \0 to delete )
( )
( pos points to the next open stack frame. )
( when pos points to data the stack is empty. )
( when pos points to pos the stack is full. )
@undo-stack [
&data $180 ( 128 steps )
&pos :undo-stack/data
]
( actual file data to be edited )
@data $ce80
( end of femto.tal )
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