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|
type environment {
screen: (handle screen)
program: (handle program)
cursor-word: (handle word)
nrows: int
ncols: int
code-separator-col: int
}
fn initialize-environment _env: (addr environment) {
var env/esi: (addr environment) <- copy _env
var program-ah/eax: (addr handle program) <- get env, program
allocate program-ah
var program/eax: (addr program) <- lookup *program-ah
var cursor-word-ah/ecx: (addr handle word) <- get env, cursor-word
initialize-program program, cursor-word-ah
# initialize screen
var screen-ah/eax: (addr handle screen) <- get env, screen
var _screen/eax: (addr screen) <- lookup *screen-ah
var screen/edi: (addr screen) <- copy _screen
var nrows/eax: int <- copy 0
var ncols/ecx: int <- copy 0
nrows, ncols <- screen-size screen
var dest/edx: (addr int) <- get env, nrows
copy-to *dest, nrows
dest <- get env, ncols
copy-to *dest, ncols
var repl-col/ecx: int <- copy ncols
repl-col <- shift-right 1
dest <- get env, code-separator-col
copy-to *dest, repl-col
}
fn draw-screen _env: (addr environment) {
var env/esi: (addr environment) <- copy _env
var screen-ah/eax: (addr handle screen) <- get env, screen
var _screen/eax: (addr screen) <- lookup *screen-ah
var screen/edi: (addr screen) <- copy _screen
var dest/edx: (addr int) <- get env, code-separator-col
var tmp/eax: int <- copy *dest
clear-canvas env
tmp <- add 2 # repl-margin-left
move-cursor screen, 3, tmp # input-row
}
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 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
}
compare key, 0xa # enter
{
break-if-!=
# toggle display of subsidiary stack
var cursor-word-ah/edx: (addr handle word) <- get self, cursor-word
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
var display-subsidiary-stack?/eax: (addr boolean) <- get cursor-word, display-subsidiary-stack?
var tmp/ecx: int <- copy 1
tmp <- subtract *display-subsidiary-stack?
copy-to *display-subsidiary-stack?, tmp
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 evaluate-environment _env: (addr environment), stack: (addr value-stack) {
var env/esi: (addr environment) <- copy _env
# program
var program-ah/eax: (addr handle program) <- get env, program
var _program/eax: (addr program) <- lookup *program-ah
var program/esi: (addr program) <- copy _program
# defs
var defs/edx: (addr handle function) <- get program, defs
# line
var sandbox-ah/esi: (addr handle sandbox) <- get program, sandboxes
var sandbox/eax: (addr sandbox) <- lookup *sandbox-ah
var line-ah/eax: (addr handle line) <- get sandbox, data
var _line/eax: (addr line) <- lookup *line-ah
var line/esi: (addr line) <- copy _line
evaluate defs, 0, line, 0, stack
}
fn render _env: (addr environment) {
var env/esi: (addr environment) <- copy _env
clear-canvas 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
var _repl-col/ecx: (addr int) <- get env, code-separator-col
var repl-col/ecx: int <- copy *_repl-col
repl-col <- add 2 # repl-margin-left
# cursor-word
var cursor-word-ah/ebx: (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
# program
var program-ah/eax: (addr handle program) <- get env, program
var _program/eax: (addr program) <- lookup *program-ah
var program/esi: (addr program) <- copy _program
# defs
var defs/edx: (addr handle function) <- get program, defs
# line
var sandbox-ah/esi: (addr handle sandbox) <- get program, sandboxes
var sandbox/eax: (addr sandbox) <- lookup *sandbox-ah
var line-ah/eax: (addr handle line) <- get sandbox, data
var _line/eax: (addr line) <- lookup *line-ah
var line/esi: (addr line) <- copy _line
# cursor-col
var cursor-col: int
var cursor-col-a/eax: (addr int) <- address cursor-col
#
var dummy/ecx: int <- render-line screen, defs, 0, line, 3, repl-col, cursor-word, cursor-col-a # input-row=3
move-cursor screen, 3, cursor-col # input-row
}
fn render-line screen: (addr screen), defs: (addr handle function), bindings: (addr table), _line: (addr line), top-row: int, left-col: int, cursor-word: (addr word), cursor-col-a: (addr int) -> right-col/ecx: int {
# curr-word
var line/esi: (addr line) <- copy _line
var first-word-ah/eax: (addr handle word) <- get line, data
var curr-word/eax: (addr word) <- lookup *first-word-ah
# loop-carried dependency
var curr-col/ecx: int <- copy left-col
#
{
compare curr-word, 0
break-if-=
# if necessary, first render columns for subsidiary stack
$render-line:subsidiary: {
{
var display-subsidiary-stack?/eax: (addr boolean) <- get curr-word, display-subsidiary-stack?
compare *display-subsidiary-stack?, 0 # false
break-if-= $render-line:subsidiary
}
# does function exist?
var callee/edi: (addr function) <- copy 0
{
var curr-stream-storage: (stream byte 0x10)
var curr-stream/esi: (addr stream byte) <- address curr-stream-storage
emit-word curr-word, curr-stream
var callee-h: (handle function)
var callee-ah/eax: (addr handle function) <- address callee-h
find-function defs, curr-stream, callee-ah
var _callee/eax: (addr function) <- lookup *callee-ah
callee <- copy _callee
compare callee, 0
break-if-= $render-line:subsidiary
}
move-cursor screen, top-row, curr-col
print-word screen, curr-word
{
var word-len/eax: int <- word-length curr-word
curr-col <- add word-len
curr-col <- add 2
add-to top-row, 1
}
# obtain stack at call site
var stack-storage: value-stack
var stack/edx: (addr value-stack) <- address stack-storage
initialize-value-stack stack, 0x10
{
var prev-word-ah/eax: (addr handle word) <- get curr-word, prev
var prev-word/eax: (addr word) <- lookup *prev-word-ah
compare prev-word, 0
break-if-=
evaluate defs, bindings, line, prev-word, stack
}
# construct new bindings
var callee-bindings-storage: table
var callee-bindings/esi: (addr table) <- address callee-bindings-storage
initialize-table callee-bindings, 0x10
bind-args callee, stack, callee-bindings
# obtain body
var callee-body-ah/eax: (addr handle line) <- get callee, body
var callee-body/eax: (addr line) <- lookup *callee-body-ah
# - render subsidiary stack
curr-col <- render-line screen, defs, callee-bindings, callee-body, top-row, curr-col, cursor-word, cursor-col-a
#
move-cursor screen, top-row, curr-col
print-code-point screen, 0x21d7 # ⇗
#
curr-col <- add 2
subtract-from top-row, 1
}
# now render main column
curr-col <- render-column screen, defs, bindings, line, curr-word, top-row, 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
}
right-col <- copy curr-col
}
# Render:
# - starting at top-row, left-col: final-word
# - starting somewhere below at left-col: the stack result from interpreting first-world to final-word (inclusive)
# unless final-word is truly the final word, in which case it might be incomplete
#
# 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), defs: (addr handle function), bindings: (addr table), scratch: (addr line), final-word: (addr word), top-row: int, left-col: int, cursor-word: (addr word), cursor-col-a: (addr int) -> right-col/ecx: int {
var max-width/ecx: int <- copy 0
{
# indent stack
var indented-col/ebx: int <- copy left-col
indented-col <- add 1 # margin-right - 2 for padding spaces
# compute stack
var stack: value-stack
var stack-addr/edi: (addr value-stack) <- address stack
initialize-value-stack stack-addr, 0x10 # max-words
evaluate defs, bindings, scratch, final-word, stack-addr
# render stack
var curr-row/edx: int <- copy top-row
curr-row <- add 3 # stack-margin-top
var _max-width/eax: int <- value-stack-max-width stack-addr
var max-width/esi: int <- copy _max-width
var i/eax: int <- value-stack-length stack-addr
{
compare i, 0
break-if-<=
move-cursor screen, curr-row, indented-col
{
var val/eax: int <- pop-int-from-value-stack stack-addr
render-integer screen, val, max-width
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
reset-formatting screen
move-cursor screen, top-row, left-col
print-word screen, final-word
{
var size/eax: int <- word-length final-word
compare size, max-width
break-if-<=
max-width <- copy size
}
# 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 left-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 left-col
right-col <- add 3 # margin-right
}
# synaesthesia
fn render-integer screen: (addr screen), val: int, max-width: int {
var bg/eax: int <- hash-color val
var fg/ecx: int <- copy 7
{
compare bg, 2
break-if-!=
fg <- copy 0
}
{
compare bg, 3
break-if-!=
fg <- copy 0
}
{
compare bg, 6
break-if-!=
fg <- copy 0
}
start-color screen, fg, bg
print-grapheme screen, 0x20 # space
print-int32-decimal-right-justified screen, val, max-width
print-grapheme screen, 0x20 # space
}
fn hash-color val: int -> result/eax: int {
result <- try-modulo val, 7 # assumes that 7 is always the background color
}
fn clear-canvas _env: (addr environment) {
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
clear-screen screen
var nrows/eax: (addr int) <- get env, nrows
var _repl-col/ecx: (addr int) <- get env, code-separator-col
var repl-col/ecx: int <- copy *_repl-col
draw-vertical-line screen, 1, *nrows, repl-col
move-cursor screen, 3, 2
print-string screen, "x 2* = x 2 *"
move-cursor screen, 4, 2
print-string screen, "x 1+ = x 1 +"
move-cursor screen, 5, 2
print-string screen, "x 2+ = x 1+ 1+"
}
fn real-grapheme? g: grapheme -> result/eax: boolean {
result <- copy 1 # true
}
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