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type environment {
screen: (handle screen)
cursor-word: (handle word)
}
fn initialize-environment _env: (addr environment) {
var env/esi: (addr environment) <- copy _env
var cursor-word-ah/eax: (addr handle word) <- get env, cursor-word
allocate cursor-word-ah
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
initialize-word cursor-word
}
fn initialize-environment-with-fake-screen _self: (addr environment), nrows: int, ncols: int {
var self/esi: (addr environment) <- copy _self
var screen-ah/eax: (addr handle screen) <- get self, screen
allocate screen-ah
var screen-addr/eax: (addr screen) <- lookup *screen-ah
initialize-screen screen-addr, nrows, ncols
initialize-environment self
}
fn render-loop _self: (addr environment) {
var self/esi: (addr environment) <- copy _self
# initial render
{
var screen-ah/edi: (addr handle screen) <- get self, screen
var screen/eax: (addr screen) <- lookup *screen-ah
move-cursor screen, 3, 3 # input-row, input-col
}
#
$interactive:loop: {
var key/eax: grapheme <- read-key-from-real-keyboard
compare key, 0x71 # 'q'
break-if-=
process self, key
var max-depth/eax: int <- compute-max-depth self
render self, max-depth
loop
}
}
fn process _self: (addr environment), key: grapheme {
$process:body: {
var self/esi: (addr environment) <- copy _self
compare key, 0x445b1b # left-arrow
{
break-if-!=
var cursor-word-ah/edi: (addr handle word) <- get self, cursor-word
var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
var cursor-word/ecx: (addr word) <- copy _cursor-word
# if not at start, move left within current word
var at-start?/eax: boolean <- cursor-at-start? cursor-word
compare at-start?, 0 # false
{
break-if-=
cursor-left cursor-word
break $process:body
}
# otherwise, move to end of prev word
var prev-word-ah/esi: (addr handle word) <- get cursor-word, prev
var prev-word/eax: (addr word) <- lookup *prev-word-ah
{
compare prev-word, 0
break-if-=
copy-object prev-word-ah, cursor-word-ah
cursor-to-end prev-word
}
break $process:body
}
compare key, 0x435b1b # right-arrow
{
break-if-!=
var cursor-word-ah/edi: (addr handle word) <- get self, cursor-word
var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
var cursor-word/ecx: (addr word) <- copy _cursor-word
# if not at end, move right within current word
var at-end?/eax: boolean <- cursor-at-end? cursor-word
compare at-end?, 0 # false
{
break-if-=
cursor-right cursor-word
break $process:body
}
# otherwise, move to start of next word
var next-word-ah/esi: (addr handle word) <- get cursor-word, next
var next-word/eax: (addr word) <- lookup *next-word-ah
{
compare next-word, 0
break-if-=
copy-object next-word-ah, cursor-word-ah
cursor-to-start next-word
}
break $process:body
}
compare key, 0x7f # del (backspace on Macs)
{
break-if-!=
var cursor-word-ah/edi: (addr handle word) <- get self, cursor-word
var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
var cursor-word/ecx: (addr word) <- copy _cursor-word
# if not at start of some word, delete grapheme before cursor within current word
var at-start?/eax: boolean <- cursor-at-start? cursor-word
compare at-start?, 0 # false
{
break-if-=
delete-before-cursor cursor-word
break $process:body
}
# otherwise delete current word and move to end of prev word
var prev-word-ah/esi: (addr handle word) <- get cursor-word, prev
var prev-word/eax: (addr word) <- lookup *prev-word-ah
{
compare prev-word, 0
break-if-=
copy-object prev-word-ah, cursor-word-ah
cursor-to-end prev-word
delete-next prev-word
}
break $process:body
}
compare key, 0x20 # space
{
break-if-!=
# insert new word
var cursor-word-ah/edx: (addr handle word) <- get self, cursor-word
append-word cursor-word-ah
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
var next-word-ah/ecx: (addr handle word) <- get cursor-word, next
copy-object next-word-ah, cursor-word-ah
break $process:body
}
# otherwise insert key within current word
var g/edx: grapheme <- copy key
var print?/eax: boolean <- real-grapheme? key
{
compare print?, 0 # false
break-if-=
var cursor-word-ah/eax: (addr handle word) <- get self, cursor-word
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
add-grapheme-to-word cursor-word, g
break $process:body
}
# silently ignore other hotkeys
}
}
fn render _env: (addr environment), max-depth: int {
var env/esi: (addr environment) <- copy _env
var screen-ah/edi: (addr handle screen) <- get env, screen
var _screen/eax: (addr screen) <- lookup *screen-ah
var screen/edi: (addr screen) <- copy _screen
# prepare screen
clear-screen screen
move-cursor screen, 5, 1 # input-row+stack-margin-top
print-string screen, "stack:"
move-cursor screen, 3, 3 # input-row, input-col
# cursor-word
var cursor-word-ah/esi: (addr handle word) <- get env, cursor-word
var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
var cursor-word/ebx: (addr word) <- copy _cursor-word
# curr-word
var curr-word/eax: (addr word) <- first-word cursor-word
# first-word
var first-word: (addr word)
copy-to first-word, curr-word
# cursor-col
var cursor-col: int
var cursor-col-a: (addr int)
var tmp/ecx: (addr int) <- address cursor-col
copy-to cursor-col-a, tmp
# curr-col
var curr-col/ecx: int <- copy 3 # input-col
{
compare curr-word, 0
break-if-=
move-cursor screen, 3, curr-col # input-row
curr-col <- render-column screen, first-word, curr-word, max-depth, curr-col, cursor-word, cursor-col-a
var next-word-ah/edx: (addr handle word) <- get curr-word, next
curr-word <- lookup *next-word-ah
loop
}
var col/eax: (addr int) <- copy cursor-col-a
move-cursor screen, 3, *col # input-row
}
# Render:
# - final-word
# - the stack result from interpreting first-world to final-word (inclusive)
# with the bottom-left corner at botleft-row, botleft-col.
#
# Outputs:
# - Return the farthest column written.
# - If final-word is same as cursor-word, do some additional computation to set
# cursor-col-a.
fn render-column screen: (addr screen), first-word: (addr word), final-word: (addr word), botleft-depth: int, botleft-col: int, cursor-word: (addr word), cursor-col-a: (addr int) -> right-col/ecx: int {
var max-width/ecx: int <- copy 0
# compute stack
var stack: int-stack
var stack-addr/edi: (addr int-stack) <- address stack
initialize-int-stack stack-addr, 0x10 # max-words
evaluate first-word, final-word, stack-addr
# render stack
var curr-row/edx: int <- copy botleft-depth
curr-row <- add 6 # input-row 3 + stack-margin-top 3
var i/eax: int <- int-stack-length stack-addr
curr-row <- subtract i
{
compare i, 0
break-if-<=
move-cursor screen, curr-row, botleft-col
{
var val/eax: int <- pop-int-stack stack-addr
print-int32-decimal screen, val
var size/eax: int <- decimal-size val
compare size, max-width
break-if-<=
max-width <- copy size
}
curr-row <- increment
i <- decrement
loop
}
# render word, initialize result
move-cursor screen, 3, botleft-col # input-row
print-word screen, final-word
# update cursor
{
var f/eax: (addr word) <- copy final-word
compare f, cursor-word
break-if-!=
var cursor-index/eax: int <- cursor-index cursor-word
cursor-index <- add botleft-col
var dest/edi: (addr int) <- copy cursor-col-a
copy-to *dest, cursor-index
}
# post-process right-col
right-col <- copy max-width
right-col <- add botleft-col
right-col <- add 3 # margin-right
}
# We could be a little faster by not using 'first-word' (since max is commutative),
# but this way the code follows the pattern of 'render'. Let's see if that's a net win.
fn compute-max-depth _env: (addr environment) -> result/eax: int {
var env/esi: (addr environment) <- copy _env
# cursor-word
var cursor-word-ah/esi: (addr handle word) <- get env, cursor-word
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
# curr-word
var curr-word/eax: (addr word) <- first-word cursor-word
# first-word
var first-word: (addr word)
copy-to first-word, curr-word
#
var out/ebx: int <- copy 0
{
compare curr-word, 0
break-if-=
var curr-max-depth/edi: int <- max-stack-depth first-word, curr-word
compare curr-max-depth, out
{
break-if-<=
out <- copy curr-max-depth
}
var next-word-ah/edx: (addr handle word) <- get curr-word, next
curr-word <- lookup *next-word-ah
loop
}
result <- copy out
}
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