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|
type environment {
screen: (handle screen)
functions: (handle function)
sandboxes: (handle sandbox)
nrows: int
ncols: int
code-separator-col: int
}
fn initialize-environment _env: (addr environment) {
var env/esi: (addr environment) <- copy _env
# initialize some predefined function definitions
var functions/eax: (addr handle function) <- get env, functions
create-primitive-functions functions
# initialize first sandbox
var sandbox-ah/eax: (addr handle sandbox) <- get env, sandboxes
allocate sandbox-ah
var sandbox/eax: (addr sandbox) <- lookup *sandbox-ah
initialize-sandbox sandbox
# 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
}
#############
# Iterate
#############
fn process _self: (addr environment), key: grapheme {
$process:body: {
var self/esi: (addr environment) <- copy _self
var sandbox-ah/eax: (addr handle sandbox) <- get self, sandboxes
var _sandbox/eax: (addr sandbox) <- lookup *sandbox-ah
var sandbox/edi: (addr sandbox) <- copy _sandbox
var rename-word-mode-ah?/ecx: (addr handle word) <- get sandbox, partial-name-for-cursor-word
var rename-word-mode?/eax: (addr word) <- lookup *rename-word-mode-ah?
compare rename-word-mode?, 0
{
break-if-=
#? print-string 0, "processing sandbox rename\n"
process-sandbox-rename sandbox, key
break $process:body
}
var define-function-mode-ah?/ecx: (addr handle word) <- get sandbox, partial-name-for-function
var define-function-mode?/eax: (addr word) <- lookup *define-function-mode-ah?
compare define-function-mode?, 0
{
break-if-=
#? print-string 0, "processing function definition\n"
var functions/ecx: (addr handle function) <- get self, functions
process-sandbox-define sandbox, functions, key
break $process:body
}
#? print-string 0, "processing sandbox\n"
process-sandbox self, sandbox, key
}
}
fn process-sandbox _self: (addr environment), _sandbox: (addr sandbox), key: grapheme {
$process-sandbox:body: {
var self/esi: (addr environment) <- copy _self
var sandbox/edi: (addr sandbox) <- copy _sandbox
var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var cursor-word-ah/ebx: (addr handle word) <- get cursor-call-path, word
var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
var cursor-word/ecx: (addr word) <- copy _cursor-word
compare key, 0x445b1b # left-arrow
$process-sandbox:key-left-arrow: {
break-if-!=
#? print-string 0, "left-arrow\n"
# 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-!=
#? print-string 0, "cursor left within word\n"
cursor-left cursor-word
break $process-sandbox:body
}
# if current word is expanded, move to the rightmost word in its body
{
var cursor-call-path/esi: (addr handle call-path-element) <- get sandbox, cursor-call-path
var expanded-words/edx: (addr handle call-path) <- get sandbox, expanded-words
var curr-word-is-expanded?/eax: boolean <- find-in-call-paths expanded-words, cursor-call-path
compare curr-word-is-expanded?, 0 # false
break-if-=
# update cursor-call-path
#? print-string 0, "curr word is expanded\n"
var self/ecx: (addr environment) <- copy _self
var functions/ecx: (addr handle function) <- get self, functions
var body: (handle line)
var body-ah/eax: (addr handle line) <- address body
function-body functions, cursor-word-ah, body-ah
var body-addr/eax: (addr line) <- lookup *body-ah
var first-word-ah/edx: (addr handle word) <- get body-addr, data
var final-word-h: (handle word)
var final-word-ah/eax: (addr handle word) <- address final-word-h
final-word first-word-ah, final-word-ah
push-to-call-path-element cursor-call-path, final-word-ah
# move cursor to end of word
var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var cursor-word-ah/eax: (addr handle word) <- get cursor-call-path, word
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
cursor-to-end cursor-word
break $process-sandbox:body
}
# if at first word, look for a caller to jump to
$process-sandbox:key-left-arrow-first-word: {
var prev-word-ah/edx: (addr handle word) <- get cursor-word, prev
var prev-word/eax: (addr word) <- lookup *prev-word-ah
compare prev-word, 0
break-if-!=
$process-sandbox:key-left-arrow-first-word-and-caller: {
#? print-string 0, "return\n"
{
var cursor-call-path-ah/edi: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var next-cursor-element-ah/edx: (addr handle call-path-element) <- get cursor-call-path, next
var next-cursor-element/eax: (addr call-path-element) <- lookup *next-cursor-element-ah
compare next-cursor-element, 0
break-if-= $process-sandbox:key-left-arrow-first-word-and-caller
copy-object next-cursor-element-ah, cursor-call-path-ah
}
var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var cursor-word-ah/eax: (addr handle word) <- get cursor-call-path, word
var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
cursor-word <- copy _cursor-word
}
}
# then move to end of previous word
var prev-word-ah/edx: (addr handle word) <- get cursor-word, prev
var prev-word/eax: (addr word) <- lookup *prev-word-ah
{
compare prev-word, 0
break-if-=
#? print-string 0, "move to previous word\n"
cursor-to-end prev-word
#? {
#? var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
#? var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
#? var cursor-word-ah/eax: (addr handle word) <- get cursor-call-path, word
#? var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
#? var cursor-word/ebx: (addr word) <- copy _cursor-word
#? print-string 0, "word at cursor before: "
#? print-word 0, cursor-word
#? print-string 0, "\n"
#? }
var cursor-call-path/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
decrement-final-element cursor-call-path
#? {
#? var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
#? var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
#? var cursor-word-ah/eax: (addr handle word) <- get cursor-call-path, word
#? var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
#? var cursor-word/ebx: (addr word) <- copy _cursor-word
#? print-string 0, "word at cursor after: "
#? print-word 0, cursor-word
#? print-string 0, "\n"
#? }
}
break $process-sandbox:body
}
compare key, 0x435b1b # right-arrow
$process-sandbox:key-right-arrow: {
break-if-!=
# 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-!=
#? print-string 0, "a\n"
cursor-right cursor-word
break $process-sandbox:body
}
# if at final word, look for a caller to jump to
{
var next-word-ah/edx: (addr handle word) <- get cursor-word, next
var next-word/eax: (addr word) <- lookup *next-word-ah
compare next-word, 0
break-if-!=
var cursor-call-path-ah/edi: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var next-cursor-element-ah/ecx: (addr handle call-path-element) <- get cursor-call-path, next
var next-cursor-element/eax: (addr call-path-element) <- lookup *next-cursor-element-ah
compare next-cursor-element, 0
break-if-=
copy-object next-cursor-element-ah, cursor-call-path-ah
break $process-sandbox:body
}
# otherwise, move to the next word
var next-word-ah/edx: (addr handle word) <- get cursor-word, next
var next-word/eax: (addr word) <- lookup *next-word-ah
{
compare next-word, 0
break-if-=
#? print-string 0, "b\n"
cursor-to-start next-word
# . . cursor-word now out of date
var cursor-call-path/ecx: (addr handle call-path-element) <- get sandbox, cursor-call-path
increment-final-element cursor-call-path
# Is the new cursor word expanded? If so, it's a function call. Add a
# new level to the cursor-call-path for the call's body.
$process-sandbox:key-right-arrow-next-word-is-call-expanded: {
#? print-string 0, "c\n"
{
var expanded-words/eax: (addr handle call-path) <- get sandbox, expanded-words
var curr-word-is-expanded?/eax: boolean <- find-in-call-paths expanded-words, cursor-call-path
compare curr-word-is-expanded?, 0 # false
break-if-= $process-sandbox:key-right-arrow-next-word-is-call-expanded
}
var callee-h: (handle function)
var callee-ah/edx: (addr handle function) <- address callee-h
var functions/ebx: (addr handle function) <- get self, functions
callee functions, next-word, callee-ah
var callee/eax: (addr function) <- lookup *callee-ah
var callee-body-ah/eax: (addr handle line) <- get callee, body
var callee-body/eax: (addr line) <- lookup *callee-body-ah
var callee-body-first-word/edx: (addr handle word) <- get callee-body, data
push-to-call-path-element cursor-call-path, callee-body-first-word
# position cursor at left
var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var cursor-word-ah/eax: (addr handle word) <- get cursor-call-path, word
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
cursor-to-start cursor-word
#? print-string 0, "d\n"
break $process-sandbox:body
}
}
break $process-sandbox:body
}
compare key, 0xa # enter
{
break-if-!=
# toggle display of subsidiary stack
toggle-cursor-word sandbox
break $process-sandbox:body
}
# word-based motions
compare key, 2 # ctrl-b
$process-sandbox:prev-word: {
break-if-!=
# jump to previous word at same level
var prev-word-ah/edx: (addr handle word) <- get cursor-word, prev
var prev-word/eax: (addr word) <- lookup *prev-word-ah
{
compare prev-word, 0
break-if-=
cursor-to-end prev-word
var cursor-call-path/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
decrement-final-element cursor-call-path
break $process-sandbox:body
}
# if previous word doesn't exist, try to bump up one level
{
var cursor-call-path-ah/edi: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var caller-cursor-element-ah/ecx: (addr handle call-path-element) <- get cursor-call-path, next
var caller-cursor-element/eax: (addr call-path-element) <- lookup *caller-cursor-element-ah
compare caller-cursor-element, 0
break-if-=
# check if previous word exists in caller
var caller-word-ah/eax: (addr handle word) <- get caller-cursor-element, word
var caller-word/eax: (addr word) <- lookup *caller-word-ah
var word-before-caller-ah/eax: (addr handle word) <- get caller-word, prev
var word-before-caller/eax: (addr word) <- lookup *word-before-caller-ah
compare word-before-caller, 0
break-if-=
# if so jump to it
drop-from-call-path-element cursor-call-path-ah
decrement-final-element cursor-call-path-ah
break $process-sandbox:body
}
}
compare key, 6 # ctrl-f
$process-sandbox:next-word: {
break-if-!=
#? print-string 0, "AA\n"
# jump to previous word at same level
var next-word-ah/edx: (addr handle word) <- get cursor-word, next
var next-word/eax: (addr word) <- lookup *next-word-ah
{
compare next-word, 0
break-if-=
#? print-string 0, "BB\n"
cursor-to-end next-word
var cursor-call-path/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
increment-final-element cursor-call-path
break $process-sandbox:body
}
# if next word doesn't exist, try to bump up one level
#? print-string 0, "CC\n"
var cursor-call-path-ah/edi: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var caller-cursor-element-ah/ecx: (addr handle call-path-element) <- get cursor-call-path, next
var caller-cursor-element/eax: (addr call-path-element) <- lookup *caller-cursor-element-ah
compare caller-cursor-element, 0
break-if-=
#? print-string 0, "DD\n"
copy-object caller-cursor-element-ah, cursor-call-path-ah
break $process-sandbox:body
}
# line-based motions
compare key, 1 # ctrl-a
$process-sandbox:start-of-line: {
break-if-!=
# move cursor up past all calls and to start of line
var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
drop-nested-calls cursor-call-path-ah
move-final-element-to-start-of-line cursor-call-path-ah
# move cursor to start of initial word
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var cursor-word-ah/eax: (addr handle word) <- get cursor-call-path, word
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
cursor-to-start cursor-word
# this works as long as the first word isn't expanded
# but we don't expect to see zero-arg functions first-up
break $process-sandbox:body
}
compare key, 5 # ctrl-e
$process-sandbox:end-of-line: {
break-if-!=
# move cursor to final word of sandbox
var cursor-call-path-ah/ecx: (addr handle call-path-element) <- get sandbox, cursor-call-path
initialize-path-from-sandbox sandbox, cursor-call-path-ah
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var dest/eax: (addr handle word) <- get cursor-call-path, word
final-word dest, dest
# move cursor to end of final word
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
cursor-to-end cursor-word
# this works because expanded words lie to the right of their bodies
# so the final word is always guaranteed to be at the top-level
break $process-sandbox:body
}
compare key, 0x15 # ctrl-u
$process-sandbox:clear-line: {
break-if-!=
# clear line in sandbox
initialize-sandbox sandbox
break $process-sandbox:body
}
# if cursor is within a call, disable editing hotkeys below
var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var next-cursor-element-ah/eax: (addr handle call-path-element) <- get cursor-call-path, next
var next-cursor-element/eax: (addr call-path-element) <- lookup *next-cursor-element-ah
compare next-cursor-element, 0
break-if-!= $process-sandbox:body
# - remaining keys only work at the top row outside any function calls
compare key, 0x7f # del (backspace on Macs)
$process-sandbox:backspace: {
break-if-!=
# 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-sandbox:body
}
# otherwise delete current word and move to end of prev word
var prev-word-ah/eax: (addr handle word) <- get cursor-word, prev
var prev-word/eax: (addr word) <- lookup *prev-word-ah
{
compare prev-word, 0
break-if-=
cursor-to-end prev-word
delete-next prev-word
var cursor-call-path/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
decrement-final-element cursor-call-path
}
break $process-sandbox:body
}
compare key, 0x20 # space
$process-sandbox:space: {
break-if-!=
#? print-string 0, "space\n"
# if cursor is at start of word, insert word before
{
var at-start?/eax: boolean <- cursor-at-start? cursor-word
compare at-start?, 0 # false
break-if-=
var prev-word-ah/eax: (addr handle word) <- get cursor-word, prev
append-word prev-word-ah
var cursor-call-path/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
decrement-final-element cursor-call-path
break $process-sandbox:body
}
# if start of word is quote and grapheme before cursor is not, just insert it as usual
{
var first-grapheme/eax: grapheme <- first-grapheme cursor-word
compare first-grapheme, 0x22 # double quote
break-if-!=
var final-grapheme/eax: grapheme <- grapheme-before-cursor cursor-word
compare final-grapheme, 0x22 # double quote
break-if-=
break $process-sandbox:space
}
# otherwise insert word after and move cursor to it for the next key
# (but we'll continue to track the current cursor-word for the rest of this function)
append-word cursor-word-ah
var cursor-call-path/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
increment-final-element cursor-call-path
# if cursor is at end of word, that's all
var at-end?/eax: boolean <- cursor-at-end? cursor-word
compare at-end?, 0 # false
break-if-!= $process-sandbox:body
# otherwise we're in the middle of a word
# move everything after cursor to the (just created) next word
var next-word-ah/eax: (addr handle word) <- get cursor-word, next
var _next-word/eax: (addr word) <- lookup *next-word-ah
var next-word/ebx: (addr word) <- copy _next-word
{
var at-end?/eax: boolean <- cursor-at-end? cursor-word
compare at-end?, 0 # false
break-if-!=
var g/eax: grapheme <- pop-after-cursor cursor-word
add-grapheme-to-word next-word, g
loop
}
cursor-to-start next-word
break $process-sandbox:body
}
compare key, 0xe # ctrl-n
$process:rename-word: {
break-if-!=
# TODO: ensure current word is not a function
# rename word at cursor
var new-name-ah/eax: (addr handle word) <- get sandbox, partial-name-for-cursor-word
allocate new-name-ah
var new-name/eax: (addr word) <- lookup *new-name-ah
initialize-word new-name
break $process-sandbox:body
}
compare key, 4 # ctrl-d
$process:define-function: {
break-if-!=
# define function out of line at cursor
var new-name-ah/eax: (addr handle word) <- get sandbox, partial-name-for-function
allocate new-name-ah
var new-name/eax: (addr word) <- lookup *new-name-ah
initialize-word new-name
break $process-sandbox:body
}
# otherwise insert key within current word
var g/edx: grapheme <- copy key
var print?/eax: boolean <- real-grapheme? key
$process-sandbox:real-grapheme: {
compare print?, 0 # false
break-if-=
add-grapheme-to-word cursor-word, g
break $process-sandbox:body
}
# silently ignore other hotkeys
}
}
# collect new name in partial-name-for-cursor-word, and then rename the word
# at cursor to it
# Precondition: cursor-call-path is a singleton (not within a call)
fn process-sandbox-rename _sandbox: (addr sandbox), key: grapheme {
$process-sandbox-rename:body: {
var sandbox/esi: (addr sandbox) <- copy _sandbox
var new-name-ah/edi: (addr handle word) <- get sandbox, partial-name-for-cursor-word
# if 'esc' pressed, cancel rename
compare key, 0x1b # esc
$process-sandbox-rename:cancel: {
break-if-!=
var empty: (handle word)
copy-handle empty, new-name-ah
break $process-sandbox-rename:body
}
# if 'enter' pressed, perform rename
compare key, 0xa # enter
$process-sandbox-rename:commit: {
break-if-!=
#? print-string 0, "rename\n"
# new line
var new-line-h: (handle line)
var new-line-ah/eax: (addr handle line) <- address new-line-h
allocate new-line-ah
var new-line/eax: (addr line) <- lookup *new-line-ah
initialize-line new-line
var new-line-word-ah/ecx: (addr handle word) <- get new-line, data
{
# move word at cursor to new line
var cursor-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor/eax: (addr call-path-element) <- lookup *cursor-ah
var word-at-cursor-ah/eax: (addr handle word) <- get cursor, word
#? print-string 0, "cursor before at word "
#? {
#? var cursor-word/eax: (addr word) <- lookup *word-at-cursor-ah
#? print-word 0, cursor-word
#? print-string 0, "\n"
#? }
move-word-contents word-at-cursor-ah, new-line-word-ah
# copy name to word at cursor
copy-word-contents-before-cursor new-name-ah, word-at-cursor-ah
#? print-string 0, "cursor after at word "
#? {
#? var cursor-word/eax: (addr word) <- lookup *word-at-cursor-ah
#? print-word 0, cursor-word
#? print-string 0, "\n"
#? var foo/eax: int <- copy cursor-word
#? print-int32-hex 0, foo
#? print-string 0, "\n"
#? }
#? print-string 0, "new name word "
#? {
#? var new-name/eax: (addr word) <- lookup *new-name-ah
#? print-word 0, new-name
#? print-string 0, "\n"
#? var foo/eax: int <- copy new-name
#? print-int32-hex 0, foo
#? print-string 0, "\n"
#? }
}
# prepend '=' to name
{
var new-name/eax: (addr word) <- lookup *new-name-ah
cursor-to-start new-name
add-grapheme-to-word new-name, 0x3d # '='
}
# append name to new line
chain-words new-line-word-ah, new-name-ah
# new-line->next = sandbox->data
var new-line-next/ecx: (addr handle line) <- get new-line, next
var sandbox-slot/edx: (addr handle line) <- get sandbox, data
copy-object sandbox-slot, new-line-next
# sandbox->data = new-line
copy-handle new-line-h, sandbox-slot
# clear partial-name-for-cursor-word
var empty: (handle word)
copy-handle empty, new-name-ah
#? # XXX
#? var cursor-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
#? var cursor/eax: (addr call-path-element) <- lookup *cursor-ah
#? var word-at-cursor-ah/eax: (addr handle word) <- get cursor, word
#? print-string 0, "cursor after rename: "
#? {
#? var cursor-word/eax: (addr word) <- lookup *word-at-cursor-ah
#? print-word 0, cursor-word
#? print-string 0, " -- "
#? var foo/eax: int <- copy cursor-word
#? print-int32-hex 0, foo
#? print-string 0, "\n"
#? }
break $process-sandbox-rename:body
}
#
compare key, 0x7f # del (backspace on Macs)
$process-sandbox-rename:backspace: {
break-if-!=
# if not at start, delete grapheme before cursor
var new-name/eax: (addr word) <- lookup *new-name-ah
var at-start?/eax: boolean <- cursor-at-start? new-name
compare at-start?, 0 # false
{
break-if-!=
var new-name/eax: (addr word) <- lookup *new-name-ah
delete-before-cursor new-name
}
break $process-sandbox-rename:body
}
# otherwise insert key within current word
var print?/eax: boolean <- real-grapheme? key
$process-sandbox-rename:real-grapheme: {
compare print?, 0 # false
break-if-=
var new-name/eax: (addr word) <- lookup *new-name-ah
add-grapheme-to-word new-name, key
break $process-sandbox-rename:body
}
# silently ignore other hotkeys
}
}
# collect new name in partial-name-for-function, and then define the last line
# of the sandbox to be a new function with that name. Replace the last line
# with a call to the appropriate function.
# Precondition: cursor-call-path is a singleton (not within a call)
fn process-sandbox-define _sandbox: (addr sandbox), functions: (addr handle function), key: grapheme {
$process-sandbox-define:body: {
var sandbox/esi: (addr sandbox) <- copy _sandbox
var new-name-ah/edi: (addr handle word) <- get sandbox, partial-name-for-function
# if 'esc' pressed, cancel define
compare key, 0x1b # esc
$process-sandbox-define:cancel: {
break-if-!=
var empty: (handle word)
copy-handle empty, new-name-ah
break $process-sandbox-define:body
}
# if 'enter' pressed, perform define
compare key, 0xa # enter
$process-sandbox-define:commit: {
break-if-!=
#? print-string 0, "define\n"
# create new function
var new-function: (handle function)
var new-function-ah/ecx: (addr handle function) <- address new-function
allocate new-function-ah
var _new-function/eax: (addr function) <- lookup *new-function-ah
var new-function/ebx: (addr function) <- copy _new-function
var dest/edx: (addr handle function) <- get new-function, next
copy-object functions, dest
copy-object new-function-ah, functions
# set function name to new-name
var new-name/eax: (addr word) <- lookup *new-name-ah
var dest/edx: (addr handle array byte) <- get new-function, name
word-to-string new-name, dest
# move final line to body
var body-ah/eax: (addr handle line) <- get new-function, body
allocate body-ah
var body/eax: (addr line) <- lookup *body-ah
var body-contents/ecx: (addr handle word) <- get body, data
var final-line-storage: (handle line)
var final-line-ah/eax: (addr handle line) <- address final-line-storage
final-line sandbox, final-line-ah
var final-line/eax: (addr line) <- lookup *final-line-ah
var final-line-contents/eax: (addr handle word) <- get final-line, data
copy-object final-line-contents, body-contents
#
copy-unbound-words-to-args functions
#
var empty-word: (handle word)
copy-handle empty-word, final-line-contents
construct-call functions, final-line-contents
# clear partial-name-for-function
var empty-word: (handle word)
copy-handle empty-word, new-name-ah
# update cursor
var final-line/eax: (addr line) <- lookup final-line-storage
var cursor-call-path-ah/ecx: (addr handle call-path-element) <- get sandbox, cursor-call-path
allocate cursor-call-path-ah # leak
initialize-path-from-line final-line, cursor-call-path-ah
break $process-sandbox-define:body
}
#
compare key, 0x7f # del (backspace on Macs)
$process-sandbox-define:backspace: {
break-if-!=
# if not at start, delete grapheme before cursor
var new-name/eax: (addr word) <- lookup *new-name-ah
var at-start?/eax: boolean <- cursor-at-start? new-name
compare at-start?, 0 # false
{
break-if-!=
var new-name/eax: (addr word) <- lookup *new-name-ah
delete-before-cursor new-name
}
break $process-sandbox-define:body
}
# otherwise insert key within current word
var print?/eax: boolean <- real-grapheme? key
$process-sandbox-define:real-grapheme: {
compare print?, 0 # false
break-if-=
var new-name/eax: (addr word) <- lookup *new-name-ah
add-grapheme-to-word new-name, key
break $process-sandbox-define:body
}
# silently ignore other hotkeys
}
}
# extract from the body of the first function in 'functions' all words that
# aren't defined in the rest of 'functions'. Prepend them in reverse order.
# Assumes function body is a single line for now.
fn copy-unbound-words-to-args _functions: (addr handle function) {
# target
var target-ah/eax: (addr handle function) <- copy _functions
var _target/eax: (addr function) <- lookup *target-ah
var target/esi: (addr function) <- copy _target
var dest-ah/edi: (addr handle word) <- get target, args
# next
var functions-ah/edx: (addr handle function) <- get target, next
# src
var line-ah/eax: (addr handle line) <- get target, body
var line/eax: (addr line) <- lookup *line-ah
var curr-ah/eax: (addr handle word) <- get line, data
var curr/eax: (addr word) <- lookup *curr-ah
{
compare curr, 0
break-if-=
$copy-unbound-words-to-args:loop-iter: {
# is it a number?
{
var is-int?/eax: boolean <- word-is-decimal-integer? curr
compare is-int?, 0 # false
break-if-!= $copy-unbound-words-to-args:loop-iter
}
# is it a pre-existing function?
var bound?/ebx: boolean <- bound-function? curr, functions-ah
compare bound?, 0 # false
break-if-!=
# is it already bound as an arg?
var dup?/ebx: boolean <- arg-exists? _functions, curr # _functions = target-ah
compare dup?, 0 # false
break-if-!= $copy-unbound-words-to-args:loop-iter
# push copy of curr before dest-ah
var rest-h: (handle word)
var rest-ah/ecx: (addr handle word) <- address rest-h
copy-object dest-ah, rest-ah
copy-word curr, dest-ah
chain-words dest-ah, rest-ah
}
var next-ah/ecx: (addr handle word) <- get curr, next
curr <- lookup *next-ah
loop
}
}
fn bound-function? w: (addr word), functions-ah: (addr handle function) -> result/ebx: boolean {
result <- copy 1 # true
# if w == "+" return true
var subresult/eax: boolean <- word-equal? w, "+"
compare subresult, 0 # false
break-if-!=
# if w == "-" return true
subresult <- word-equal? w, "-"
compare subresult, 0 # false
break-if-!=
# if w == "*" return true
subresult <- word-equal? w, "*"
compare subresult, 0 # false
break-if-!=
# return w in functions
var out-h: (handle function)
var out/eax: (addr handle function) <- address out-h
callee functions-ah, w, out
var found?/eax: (addr function) <- lookup *out
result <- copy found?
}
fn arg-exists? _f-ah: (addr handle function), arg: (addr word) -> result/ebx: boolean {
var f-ah/eax: (addr handle function) <- copy *_f-ah
var f/eax: (addr function) <- lookup *f-ah
var args-ah/eax: (addr handle word) <- get f, args
result <- word-exists? args-ah, arg
}
# construct a call to `f` with copies of exactly its args
fn construct-call _f-ah: (addr handle function), _dest-ah: (addr handle word) {
var f-ah/eax: (addr handle function) <- copy _f-ah
var _f/eax: (addr function) <- lookup *f-ah
var f/esi: (addr function) <- copy _f
# append args in reverse
var args-ah/eax: (addr handle word) <- get f, args
var dest-ah/edi: (addr handle word) <- copy _dest-ah
copy-words-in-reverse args-ah, dest-ah
# append name
var name-ah/eax: (addr handle array byte) <- get f, name
var name/eax: (addr array byte) <- lookup *name-ah
append-word-at-end-with dest-ah, name
}
fn word-index _words: (addr handle word), _n: int, out: (addr handle word) {
$word-index:body: {
var n/ecx: int <- copy _n
{
compare n, 0
break-if-!=
copy-object _words, out
break $word-index:body
}
var words-ah/eax: (addr handle word) <- copy _words
var words/eax: (addr word) <- lookup *words-ah
var next/eax: (addr handle word) <- get words, next
n <- decrement
word-index next, n, out
}
}
fn toggle-cursor-word _sandbox: (addr sandbox) {
$toggle-cursor-word:body: {
var sandbox/esi: (addr sandbox) <- copy _sandbox
var expanded-words/edi: (addr handle call-path) <- get sandbox, expanded-words
var cursor-call-path/ecx: (addr handle call-path-element) <- get sandbox, cursor-call-path
#? print-string 0, "cursor call path: "
#? dump-call-path-element 0, cursor-call-path
#? print-string 0, "expanded words:\n"
#? dump-call-paths 0, expanded-words
var already-expanded?/eax: boolean <- find-in-call-paths expanded-words, cursor-call-path
compare already-expanded?, 0 # false
{
break-if-!=
#? print-string 0, "expand\n"
# if not already-expanded, insert
insert-in-call-path expanded-words cursor-call-path
#? print-string 0, "expanded words now:\n"
#? dump-call-paths 0, expanded-words
break $toggle-cursor-word:body
}
{
break-if-=
# otherwise delete
delete-in-call-path expanded-words cursor-call-path
}
}
}
#############
# Visualize
#############
fn evaluate-environment _env: (addr environment), stack: (addr value-stack) {
var env/esi: (addr environment) <- copy _env
# functions
var functions/edx: (addr handle function) <- get env, functions
# line
var sandbox-ah/esi: (addr handle sandbox) <- get env, 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 functions, 0, line, 0, stack
}
fn render _env: (addr environment) {
#? print-string 0, "==\n"
var env/esi: (addr environment) <- copy _env
clear-canvas env
# 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
# repl-col
var _repl-col/eax: (addr int) <- get env, code-separator-col
var repl-col/ecx: int <- copy *_repl-col
repl-col <- add 2 # repl-margin-left
# functions
var functions/edx: (addr handle function) <- get env, functions
# sandbox
var sandbox-ah/eax: (addr handle sandbox) <- get env, 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 first-word-ah/eax: (addr handle word) <- get line, data
#? var curr-word/eax: (addr word) <- lookup *first-word-ah
#? print-word 0, curr-word
#? print-string 0, "\n"
#? }
# bindings
var bindings-storage: table
var bindings/ebx: (addr table) <- address bindings-storage
initialize-table bindings, 0x10
render-sandbox screen, functions, bindings, sandbox, 3, repl-col
}
fn render-sandbox screen: (addr screen), functions: (addr handle function), bindings: (addr table), _sandbox: (addr sandbox), top-row: int, left-col: int {
var sandbox/esi: (addr sandbox) <- copy _sandbox
# line
var curr-line-ah/eax: (addr handle line) <- get sandbox, data
var _curr-line/eax: (addr line) <- lookup *curr-line-ah
var curr-line/ecx: (addr line) <- copy _curr-line
#
var curr-row/edx: int <- copy top-row
# cursor row, col
var cursor-row: int
var cursor-row-addr: (addr int)
var tmp/eax: (addr int) <- address cursor-row
copy-to cursor-row-addr, tmp
var cursor-col: int
var cursor-col-addr: (addr int)
tmp <- address cursor-col
copy-to cursor-col-addr, tmp
# render all but final line without stack
#? print-string 0, "render all but final line\n"
{
var next-line-ah/eax: (addr handle line) <- get curr-line, next
var next-line/eax: (addr line) <- lookup *next-line-ah
compare next-line, 0
break-if-=
{
var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var cursor-word-ah/eax: (addr handle word) <- get cursor-call-path, word
var cursor-word/eax: (addr word) <- lookup *cursor-word-ah
#? print-string 0, "cursor 2: "
#? {
#? print-word 0, cursor-word
#? print-string 0, " -- "
#? var foo/eax: int <- copy cursor-word
#? print-int32-hex 0, foo
#? print-string 0, "\n"
#? }
# it's enough to pass in the first word of the path, because if the path isn't a singleton the word is guaranteed to be unique
render-line-without-stack screen, curr-line, curr-row, left-col, cursor-word, cursor-row-addr, cursor-col-addr
}
curr-line <- copy next-line
curr-row <- add 2
loop
}
#
#? print-string 0, "render final line\n"
render-final-line-with-stack screen, functions, bindings, sandbox, curr-row, left-col, cursor-row-addr, cursor-col-addr
# at most one of the following dialogs will be rendered
render-rename-dialog screen, sandbox, cursor-row, cursor-col
render-define-dialog screen, sandbox, cursor-row, cursor-col
move-cursor screen, cursor-row, cursor-col
}
fn render-final-line-with-stack screen: (addr screen), functions: (addr handle function), bindings: (addr table), _sandbox: (addr sandbox), top-row: int, left-col: int, cursor-row-addr: (addr int), cursor-col-addr: (addr int) {
var sandbox/esi: (addr sandbox) <- copy _sandbox
# expanded-words
var expanded-words/edi: (addr handle call-path) <- get sandbox, expanded-words
# cursor-word
var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
var cursor-word-ah/eax: (addr handle word) <- get cursor-call-path, word
var _cursor-word/eax: (addr word) <- lookup *cursor-word-ah
var cursor-word/ebx: (addr word) <- copy _cursor-word
#? print-string 0, "word at cursor: "
#? print-word 0, cursor-word
#? print-string 0, "\n"
# cursor-call-path
var cursor-call-path: (addr handle call-path-element)
{
var src/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
copy-to cursor-call-path, src
}
# first line
var first-line-ah/eax: (addr handle line) <- get sandbox, data
var _first-line/eax: (addr line) <- lookup *first-line-ah
var first-line/edx: (addr line) <- copy _first-line
# final line
var final-line-storage: (handle line)
var final-line-ah/eax: (addr handle line) <- address final-line-storage
final-line sandbox, final-line-ah
var final-line/eax: (addr line) <- lookup *final-line-ah
# curr-path
var curr-path-storage: (handle call-path-element)
var curr-path/ecx: (addr handle call-path-element) <- address curr-path-storage
allocate curr-path # leak
initialize-path-from-line final-line, curr-path
#
var dummy/ecx: int <- render-line screen, functions, bindings, first-line, final-line, expanded-words, top-row, left-col, curr-path, cursor-word, cursor-call-path, cursor-row-addr, cursor-col-addr
}
fn final-line _sandbox: (addr sandbox), out: (addr handle line) {
var sandbox/esi: (addr sandbox) <- copy _sandbox
var curr-line-ah/ecx: (addr handle line) <- get sandbox, data
{
var curr-line/eax: (addr line) <- lookup *curr-line-ah
var next-line-ah/edx: (addr handle line) <- get curr-line, next
var next-line/eax: (addr line) <- lookup *next-line-ah
compare next-line, 0
break-if-=
curr-line-ah <- copy next-line-ah
loop
}
copy-object curr-line-ah, out
}
fn render-rename-dialog screen: (addr screen), _sandbox: (addr sandbox), cursor-row: int, cursor-col: int {
var sandbox/edi: (addr sandbox) <- copy _sandbox
var rename-word-mode-ah?/ecx: (addr handle word) <- get sandbox, partial-name-for-cursor-word
var rename-word-mode?/eax: (addr word) <- lookup *rename-word-mode-ah?
compare rename-word-mode?, 0
break-if-=
# clear a space for the dialog
var top-row/eax: int <- copy cursor-row
top-row <- subtract 3
var bottom-row/ecx: int <- copy cursor-row
bottom-row <- add 3
var left-col/edx: int <- copy cursor-col
left-col <- subtract 0x10
var right-col/ebx: int <- copy cursor-col
right-col <- add 0x10
clear-rect screen, top-row, left-col, bottom-row, right-col
draw-box screen, top-row, left-col, bottom-row, right-col
# render a little menu for the dialog
var menu-row/ecx: int <- copy bottom-row
menu-row <- decrement
var menu-col/edx: int <- copy left-col
menu-col <- add 2
move-cursor screen, menu-row, menu-col
start-reverse-video screen
print-string screen, " esc "
reset-formatting screen
print-string screen, " cancel "
start-reverse-video screen
print-string screen, " enter "
reset-formatting screen
print-string screen, " rename "
# draw the word, positioned appropriately around the cursor
var start-col/ecx: int <- copy cursor-col
var word-ah?/edx: (addr handle word) <- get sandbox, partial-name-for-cursor-word
var word/eax: (addr word) <- lookup *word-ah?
var cursor-index/eax: int <- cursor-index word
start-col <- subtract cursor-index
move-cursor screen, cursor-row, start-col
var word/eax: (addr word) <- lookup *word-ah?
print-word screen, word
}
fn render-define-dialog screen: (addr screen), _sandbox: (addr sandbox), cursor-row: int, cursor-col: int {
var sandbox/edi: (addr sandbox) <- copy _sandbox
var define-function-mode-ah?/ecx: (addr handle word) <- get sandbox, partial-name-for-function
var define-function-mode?/eax: (addr word) <- lookup *define-function-mode-ah?
compare define-function-mode?, 0
break-if-=
# clear a space for the dialog
var top-row/eax: int <- copy cursor-row
top-row <- subtract 3
var bottom-row/ecx: int <- copy cursor-row
bottom-row <- add 3
var left-col/edx: int <- copy cursor-col
left-col <- subtract 0x10
var right-col/ebx: int <- copy cursor-col
right-col <- add 0x10
clear-rect screen, top-row, left-col, bottom-row, right-col
draw-box screen, top-row, left-col, bottom-row, right-col
# render a little menu for the dialog
var menu-row/ecx: int <- copy bottom-row
menu-row <- decrement
var menu-col/edx: int <- copy left-col
menu-col <- add 2
move-cursor screen, menu-row, menu-col
start-reverse-video screen
print-string screen, " esc "
reset-formatting screen
print-string screen, " cancel "
start-reverse-video screen
print-string screen, " enter "
reset-formatting screen
print-string screen, " define "
# draw the word, positioned appropriately around the cursor
var start-col/ecx: int <- copy cursor-col
var word-ah?/edx: (addr handle word) <- get sandbox, partial-name-for-function
var word/eax: (addr word) <- lookup *word-ah?
var cursor-index/eax: int <- cursor-index word
start-col <- subtract cursor-index
move-cursor screen, cursor-row, start-col
var word/eax: (addr word) <- lookup *word-ah?
print-word screen, word
}
# Render just the words in 'line'.
fn render-line-without-stack screen: (addr screen), _line: (addr line), curr-row: int, left-col: int, cursor-word: (addr word), cursor-row-addr: (addr int), cursor-col-addr: (addr int) {
# curr-word
var line/eax: (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
var curr-word/esi: (addr word) <- copy _curr-word
#
# loop-carried dependency
var curr-col/ecx: int <- copy left-col
#
{
compare curr-word, 0
break-if-=
#? print-string 0, "-- word in penultimate lines: "
#? {
#? var foo/eax: int <- copy curr-word
#? print-int32-hex 0, foo
#? }
#? print-string 0, "\n"
var old-col/edx: int <- copy curr-col
reset-formatting screen
move-cursor screen, curr-row, curr-col
print-word screen, curr-word
{
var max-width/eax: int <- word-length curr-word
curr-col <- add max-width
curr-col <- add 1 # margin-right
}
# cache cursor column if necessary
{
compare curr-word, cursor-word
break-if-!=
#? print-string 0, "Cursor at "
#? print-int32-decimal 0, curr-row
#? print-string 0, ", "
#? print-int32-decimal 0, old-col
#? print-string 0, "\n"
#? print-string 0, "contents: "
#? print-word 0, cursor-word
#? print-string 0, "\n"
#? {
#? var foo/eax: int <- copy cursor-word
#? print-int32-hex 0, foo
#? print-string 0, "\n"
#? }
var dest/ecx: (addr int) <- copy cursor-row-addr
var src/eax: int <- copy curr-row
copy-to *dest, src
dest <- copy cursor-col-addr
copy-to *dest, old-col
var cursor-index-in-word/eax: int <- cursor-index curr-word
add-to *dest, cursor-index-in-word
}
# loop update
var next-word-ah/edx: (addr handle word) <- get curr-word, next
var _curr-word/eax: (addr word) <- lookup *next-word-ah
curr-word <- copy _curr-word
loop
}
}
fn call-depth-at-cursor _sandbox: (addr sandbox) -> result/eax: int {
var sandbox/esi: (addr sandbox) <- copy _sandbox
var cursor-call-path/edi: (addr handle call-path-element) <- get sandbox, cursor-call-path
result <- call-path-element-length cursor-call-path
result <- add 2 # input-row-1
}
fn call-path-element-length _x: (addr handle call-path-element) -> result/eax: int {
var curr-ah/ecx: (addr handle call-path-element) <- copy _x
var out/edi: int <- copy 0
{
var curr/eax: (addr call-path-element) <- lookup *curr-ah
compare curr, 0
break-if-=
curr-ah <- get curr, next
out <- increment
loop
}
result <- copy out
}
# Render the line of words in line, along with the state of the stack under each word.
# Also render any expanded function calls using recursive calls.
#
# Along the way, compute the column the cursor should be positioned at (cursor-col-addr).
fn render-line screen: (addr screen), functions: (addr handle function), bindings: (addr table), first-line: (addr line), _line: (addr line), expanded-words: (addr handle call-path), top-row: int, left-col: int, curr-path: (addr handle call-path-element), cursor-word: (addr word), cursor-call-path: (addr handle call-path-element), cursor-row-addr: (addr int), cursor-col-addr: (addr int) -> right-col/ecx: int {
#? print-string 0, "--\n"
# 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
var debug-row: int
copy-to debug-row, 0x20
#
# loop-carried dependency
var curr-col/ecx: int <- copy left-col
#
{
compare curr-word, 0
break-if-=
#? print-string 0, "-- word in final line: "
#? {
#? var foo/eax: int <- copy curr-word
#? print-int32-hex 0, foo
#? }
#? print-string 0, "\n"
# if necessary, first render columns for subsidiary stack
$render-line:subsidiary: {
{
#? print-string 0, "check sub\n"
var display-subsidiary-stack?/eax: boolean <- find-in-call-paths expanded-words, curr-path
compare display-subsidiary-stack?, 0 # false
break-if-= $render-line:subsidiary
}
#? print-string 0, "render subsidiary stack\n"
# does function exist?
var callee/edi: (addr function) <- copy 0
{
var callee-h: (handle function)
var callee-ah/ecx: (addr handle function) <- address callee-h
callee functions, curr-word, 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
start-color screen, 8, 7
print-word screen, curr-word
{
var word-len/eax: int <- word-length curr-word
curr-col <- add word-len
curr-col <- add 2
increment top-row
}
# 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 functions, 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
var callee-body-first-word/edx: (addr handle word) <- get callee-body, data
# - render subsidiary stack
push-to-call-path-element curr-path, callee-body-first-word # leak
curr-col <- render-line screen, functions, callee-bindings, callee-body, callee-body, expanded-words, top-row, curr-col, curr-path, cursor-word, cursor-call-path, cursor-row-addr, cursor-col-addr
drop-from-call-path-element curr-path
#
move-cursor screen, top-row, curr-col
print-code-point screen, 0x21d7 # ⇗
#
curr-col <- add 2
decrement top-row
}
# render main column
var old-col/edx: int <- copy curr-col
#? move-cursor 0, debug-row, 1
#? increment debug-row
#? print-string 0, "rendering column from "
#? print-int32-decimal 0, curr-col
#? print-string 0, "\n"
curr-col <- render-column screen, functions, bindings, first-line, line, curr-word, top-row, curr-col
# cache cursor column if necessary
$render-line:cache-cursor-column: {
#? print-string 0, "cache cursor? "
#? {
#? var foo/eax: int <- copy curr-word
#? print-int32-hex 0, foo
#? }
#? print-string 0, "\n"
{
var found?/eax: boolean <- call-path-element-match? curr-path, cursor-call-path
compare found?, 0 # false
break-if-= $render-line:cache-cursor-column
}
#? print-string 0, "cursor at "
#? print-int32-decimal 0, top-row
#? print-string 0, ", "
#? print-int32-decimal 0, old-col
#? print-string 0, "\n"
var dest/edi: (addr int) <- copy cursor-row-addr
{
var src/eax: int <- copy top-row
copy-to *dest, src
}
dest <- copy cursor-col-addr
copy-to *dest, old-col
var cursor-index-in-word/eax: int <- cursor-index curr-word
add-to *dest, cursor-index-in-word
}
# loop update
#? print-string 0, "next word\n"
var next-word-ah/edx: (addr handle word) <- get curr-word, next
curr-word <- lookup *next-word-ah
#? {
#? var foo/eax: int <- copy curr-word
#? print-int32-hex 0, foo
#? print-string 0, "\n"
#? }
increment-final-element curr-path
loop
}
right-col <- copy curr-col
}
fn callee functions: (addr handle function), word: (addr word), out: (addr handle function) {
var stream-storage: (stream byte 0x10)
var stream/esi: (addr stream byte) <- address stream-storage
emit-word word, stream
find-function functions, stream, out
}
# 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)
#
# Return the farthest column written.
fn render-column screen: (addr screen), functions: (addr handle function), bindings: (addr table), first-line: (addr line), line: (addr line), final-word: (addr word), top-row: int, left-col: int -> right-col/ecx: int {
#? print-string 0, "render-column\n"
var max-width/esi: int <- copy 0
{
# indent stack
var indented-col/ebx: int <- copy left-col
indented-col <- add 1 # margin-right
# compute stack
var stack: value-stack
var stack-addr/edi: (addr value-stack) <- address stack
initialize-value-stack stack-addr, 0x10 # max-words
evaluate functions, bindings, first-line, final-word, stack-addr
# render stack
var curr-row/edx: int <- copy top-row
curr-row <- add 2 # stack-margin-top
var _max-width/eax: int <- value-stack-max-width stack-addr
max-width <- copy _max-width
{
var top-addr/ecx: (addr int) <- get stack-addr, top
compare *top-addr, 0
break-if-<=
decrement *top-addr
move-cursor screen, curr-row, indented-col
{
var data-ah/eax: (addr handle array value) <- get stack-addr, data
var data/eax: (addr array value) <- lookup *data-ah
var top/edx: int <- copy *top-addr
var dest-offset/edx: (offset value) <- compute-offset data, top
var val-addr/eax: (addr value) <- index data, dest-offset
$render-column:render-value: {
var val-type/ecx: (addr int) <- get val-addr, type
# per-type rendering logic goes here
{
compare *val-type, 1 # string
break-if-!=
var val-ah/eax: (addr handle array byte) <- get val-addr, text-data
var val/eax: (addr array byte) <- lookup *val-ah
start-color screen, 0, 7
print-grapheme screen, 0x20 # space
print-string screen, val
break $render-column:render-value
}
# render ints by default for now
var val-addr2/eax: (addr int) <- get val-addr, int-data
render-integer screen, *val-addr2, max-width
}
}
curr-row <- increment
loop
}
}
max-width <- add 2 # spaces on either side of items on the stack
# 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
}
# post-process right-col
right-col <- copy left-col
right-col <- add max-width
right-col <- add 1 # margin-right
#? print-int32-decimal 0, left-col
#? print-string 0, " => "
#? print-int32-decimal 0, right-col
#? print-string 0, "\n"
}
# 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
# wordstar-style cheatsheet of shortcuts
move-cursor screen, *nrows, 0
start-reverse-video screen
print-string screen, " ctrl-q "
reset-formatting screen
print-string screen, " quit "
var menu-start/ebx: int <- copy repl-col
menu-start <- subtract 0x40 # 64 = half the size of the menu
move-cursor screen, *nrows, menu-start
start-reverse-video screen
print-string screen, " ctrl-a "
reset-formatting screen
print-string screen, " ⏮ "
start-reverse-video screen
print-string screen, " ctrl-b "
reset-formatting screen
print-string screen, " ◀ word "
start-reverse-video screen
print-string screen, " ctrl-f "
reset-formatting screen
print-string screen, " word ▶ "
start-reverse-video screen
print-string screen, " ctrl-e "
reset-formatting screen
print-string screen, " ⏭ "
start-reverse-video screen
print-string screen, " ctrl-u "
reset-formatting screen
print-string screen, " clear line "
start-reverse-video screen
print-string screen, " ctrl-n "
reset-formatting screen
print-string screen, " name value "
start-reverse-video screen
print-string screen, " ctrl-d "
reset-formatting screen
print-string screen, " define function "
# primitives
var start-col/ecx: int <- copy repl-col
start-col <- subtract 0x18
move-cursor screen, 1, start-col
print-string screen, "primitives:"
move-cursor screen, 4, start-col
print-string screen, "functions:"
start-col <- add 2
move-cursor screen, 2, start-col
print-string screen, "+ - *"
# currently defined functions
var row/ebx: int <- copy 5
var functions/esi: (addr handle function) <- get env, functions
{
var curr/eax: (addr function) <- lookup *functions
compare curr, 0
break-if-=
move-cursor screen, row, start-col
render-function screen, curr
functions <- get curr, next
row <- increment
loop
}
}
# only single-line functions supported for now
fn render-function screen: (addr screen), _f: (addr function) {
var f/esi: (addr function) <- copy _f
var args/ecx: (addr handle word) <- get f, args
print-words-in-reverse screen, args
var name-ah/eax: (addr handle array byte) <- get f, name
var name/eax: (addr array byte) <- lookup *name-ah
print-string screen, name
print-string screen, " = "
var body-ah/eax: (addr handle line) <- get f, body
var body/eax: (addr line) <- lookup *body-ah
var body-words-ah/eax: (addr handle word) <- get body, data
print-words screen, body-words-ah
}
fn real-grapheme? g: grapheme -> result/eax: boolean {
$real-grapheme?:body: {
# if g == newline return true
compare g, 0xa
{
break-if-!=
result <- copy 1 # true
break $real-grapheme?:body
}
# if g == tab return true
compare g, 9
{
break-if-!=
result <- copy 1 # true
break $real-grapheme?:body
}
# if g < 32 return false
compare g, 0x20
{
break-if->=
result <- copy 0 # false
break $real-grapheme?:body
}
# if g <= 255 return true
compare g, 0xff
{
break-if->
result <- copy 1 # true
break $real-grapheme?:body
}
# if (g&0xff == Esc) it's an escape sequence
and-with g, 0xff
compare g, 0x1b # Esc
{
break-if-!=
result <- copy 0 # false
break $real-grapheme?:body
}
# otherwise return true
result <- copy 1 # true
}
}
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