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type global-table {
data: (handle array global)
final-index: int
}
type global {
name: (handle array byte)
input: (handle gap-buffer)
value: (handle cell)
}
fn initialize-globals _self: (addr global-table) {
var self/esi: (addr global-table) <- copy _self
compare self, 0
{
break-if-!=
abort "initialize globals"
return
}
var data-ah/eax: (addr handle array global) <- get self, data
populate data-ah, 0x40
initialize-primitives self
}
fn load-globals in: (addr handle cell), self: (addr global-table) {
draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "loading globals:", 3/fg, 0/bg
var remaining-ah/esi: (addr handle cell) <- copy in
{
var _remaining/eax: (addr cell) <- lookup *remaining-ah
var remaining/ebx: (addr cell) <- copy _remaining
var done?/eax: boolean <- nil? remaining
compare done?, 0/false
break-if-!=
#? draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "b", 2/fg 0/bg
var curr-ah/eax: (addr handle cell) <- get remaining, left
var _curr/eax: (addr cell) <- lookup *curr-ah
var curr/ecx: (addr cell) <- copy _curr
remaining-ah <- get remaining, right
draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, " ", 2/fg 0/bg
var name-ah/eax: (addr handle cell) <- get curr, left
var name/eax: (addr cell) <- lookup *name-ah
var name-data-ah/eax: (addr handle stream byte) <- get name, text-data
var _name-data/eax: (addr stream byte) <- lookup *name-data-ah
var name-data/edx: (addr stream byte) <- copy _name-data
rewind-stream name-data
draw-stream-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, name-data, 3/fg, 0/bg
var value-ah/eax: (addr handle cell) <- get curr, right
var value/eax: (addr cell) <- lookup *value-ah
var value-data-ah/eax: (addr handle stream byte) <- get value, text-data
var _value-data/eax: (addr stream byte) <- lookup *value-data-ah
var value-data/ecx: (addr stream byte) <- copy _value-data
var value-gap-buffer-storage: (handle gap-buffer)
var value-gap-buffer-ah/edi: (addr handle gap-buffer) <- address value-gap-buffer-storage
allocate value-gap-buffer-ah
var value-gap-buffer/eax: (addr gap-buffer) <- lookup *value-gap-buffer-ah
initialize-gap-buffer value-gap-buffer, 0x1000/4KB
#? draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "w", 2/fg 0/bg
load-gap-buffer-from-stream value-gap-buffer, value-data
#? draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "x", 2/fg 0/bg
read-evaluate-and-move-to-globals value-gap-buffer-ah, self, name-data
#? draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "y", 2/fg 0/bg
loop
}
move-cursor-to-left-margin-of-next-line 0/screen
#? abort "zz"
}
fn write-globals out: (addr stream byte), _self: (addr global-table) {
var self/esi: (addr global-table) <- copy _self
compare self, 0
{
break-if-!=
abort "write globals"
return
}
write out, " (globals . (\n"
var data-ah/eax: (addr handle array global) <- get self, data
var data/eax: (addr array global) <- lookup *data-ah
var final-index/edx: (addr int) <- get self, final-index
var curr-index/ecx: int <- copy 1/skip-0
{
compare curr-index, *final-index
break-if->
var curr-offset/ebx: (offset global) <- compute-offset data, curr-index
var curr/ebx: (addr global) <- index data, curr-offset
var curr-value-ah/edx: (addr handle cell) <- get curr, value
var curr-value/eax: (addr cell) <- lookup *curr-value-ah
var curr-type/eax: (addr int) <- get curr-value, type
{
compare *curr-type, 4/primitive-function
break-if-=
compare *curr-type, 5/screen
break-if-=
compare *curr-type, 6/keyboard
break-if-=
compare *curr-type, 3/stream # not implemented yet
break-if-=
write out, " ("
var curr-name-ah/eax: (addr handle array byte) <- get curr, name
var curr-name/eax: (addr array byte) <- lookup *curr-name-ah
write out, curr-name
write out, " . ["
var curr-input-ah/eax: (addr handle gap-buffer) <- get curr, input
var curr-input/eax: (addr gap-buffer) <- lookup *curr-input-ah
append-gap-buffer curr-input, out
write out, "])\n"
}
curr-index <- increment
loop
}
write out, " ))\n"
}
# globals layout: 1 char padding, 41 code, 1 padding, 41 code, 1 padding = 85 chars
fn render-globals screen: (addr screen), _self: (addr global-table) {
clear-rect screen, 0/xmin, 0/ymin, 0x55/xmax, 0x2f/ymax=screen-height-without-menu, 0xdc/bg=green-bg
var self/esi: (addr global-table) <- copy _self
compare self, 0
{
break-if-!=
abort "render globals"
return
}
var data-ah/eax: (addr handle array global) <- get self, data
var data/eax: (addr array global) <- lookup *data-ah
var curr-index/edx: int <- copy 1
{
var curr-offset/ebx: (offset global) <- compute-offset data, curr-index
var curr/ebx: (addr global) <- index data, curr-offset
var continue?/eax: boolean <- primitive-global? curr
compare continue?, 0/false
break-if-=
curr-index <- increment
loop
}
var lowest-index/edi: int <- copy curr-index
var final-index/edx: (addr int) <- get self, final-index
var curr-index/edx: int <- copy *final-index
var y1: int
copy-to y1, 1/padding-top
var y2: int
copy-to y2, 1/padding-top
$render-globals:loop: {
compare curr-index, lowest-index
break-if-<
{
compare y1, 0x2f/ymax
break-if-<
compare y2, 0x2f/ymax
break-if-<
break $render-globals:loop
}
{
var curr-offset/edx: (offset global) <- compute-offset data, curr-index
var curr/edx: (addr global) <- index data, curr-offset
var curr-input-ah/edx: (addr handle gap-buffer) <- get curr, input
var _curr-input/eax: (addr gap-buffer) <- lookup *curr-input-ah
var curr-input/ebx: (addr gap-buffer) <- copy _curr-input
compare curr-input, 0
break-if-=
$render-globals:render-global: {
var x/eax: int <- copy 0
var y/ecx: int <- copy y1
compare y, y2
{
break-if->=
x, y <- render-gap-buffer-wrapping-right-then-down screen, curr-input, 1/padding-left, y1, 0x2a/xmax, 0x2f/ymax, 0/no-cursor, 7/fg=definition, 0xc5/bg=blue-bg
y <- add 2
copy-to y1, y
break $render-globals:render-global
}
x, y <- render-gap-buffer-wrapping-right-then-down screen, curr-input, 0x2b/xmin, y2, 0x54/xmax, 0x2f/ymax, 0/no-cursor, 7/fg=definition, 0xc5/bg=blue-bg
y <- add 2
copy-to y2, y
}
}
curr-index <- decrement
loop
}
# render primitives on top
render-primitives screen, 1/xmin=padding-left, 0x55/xmax, 0x2f/ymax
}
fn render-globals-menu screen: (addr screen), _self: (addr global-table) {
}
fn edit-globals _self: (addr global-table), key: grapheme, data-disk: (addr disk) {
}
fn assign-or-create-global _self: (addr global-table), name: (addr array byte), value: (handle cell), trace: (addr trace) {
var self/esi: (addr global-table) <- copy _self
compare self, 0
{
break-if-!=
abort "assign global"
return
}
var curr-index/ecx: int <- find-symbol-name-in-globals self, name
{
compare curr-index, -1/not-found
break-if-!=
var final-index-addr/eax: (addr int) <- get self, final-index
increment *final-index-addr
curr-index <- copy *final-index-addr
}
var data-ah/eax: (addr handle array global) <- get self, data
var data/eax: (addr array global) <- lookup *data-ah
var curr-offset/esi: (offset global) <- compute-offset data, curr-index
var curr/esi: (addr global) <- index data, curr-offset
var curr-name-ah/eax: (addr handle array byte) <- get curr, name
copy-array-object name, curr-name-ah
var curr-value-ah/eax: (addr handle cell) <- get curr, value
copy-handle value, curr-value-ah
}
fn lookup-symbol-in-globals _sym: (addr cell), out: (addr handle cell), _globals: (addr global-table), trace: (addr trace), screen-cell: (addr handle cell), keyboard-cell: (addr handle cell) {
var sym/eax: (addr cell) <- copy _sym
var sym-name-ah/eax: (addr handle stream byte) <- get sym, text-data
var _sym-name/eax: (addr stream byte) <- lookup *sym-name-ah
var sym-name/edx: (addr stream byte) <- copy _sym-name
var globals/esi: (addr global-table) <- copy _globals
{
compare globals, 0
break-if-=
var curr-index/ecx: int <- find-symbol-in-globals globals, sym-name
compare curr-index, -1/not-found
break-if-=
var global-data-ah/eax: (addr handle array global) <- get globals, data
var global-data/eax: (addr array global) <- lookup *global-data-ah
var curr-offset/ebx: (offset global) <- compute-offset global-data, curr-index
var curr/ebx: (addr global) <- index global-data, curr-offset
var curr-value/eax: (addr handle cell) <- get curr, value
copy-object curr-value, out
return
}
# if sym is "screen" and screen-cell exists, return it
{
var sym-is-screen?/eax: boolean <- stream-data-equal? sym-name, "screen"
compare sym-is-screen?, 0/false
break-if-=
compare screen-cell, 0
break-if-=
copy-object screen-cell, out
return
}
# if sym is "keyboard" and keyboard-cell exists, return it
{
var sym-is-keyboard?/eax: boolean <- stream-data-equal? sym-name, "keyboard"
compare sym-is-keyboard?, 0/false
break-if-=
compare keyboard-cell, 0
break-if-=
copy-object keyboard-cell, out
return
}
# otherwise error "unbound symbol: ", sym
var stream-storage: (stream byte 0x40)
var stream/ecx: (addr stream byte) <- address stream-storage
write stream, "unbound symbol: "
rewind-stream sym-name
write-stream stream, sym-name
error-stream trace, stream
}
fn maybe-lookup-symbol-in-globals _sym: (addr cell), out: (addr handle cell), _globals: (addr global-table), trace: (addr trace) {
var sym/eax: (addr cell) <- copy _sym
var sym-name-ah/eax: (addr handle stream byte) <- get sym, text-data
var _sym-name/eax: (addr stream byte) <- lookup *sym-name-ah
var sym-name/edx: (addr stream byte) <- copy _sym-name
var globals/esi: (addr global-table) <- copy _globals
{
compare globals, 0
break-if-=
var curr-index/ecx: int <- find-symbol-in-globals globals, sym-name
compare curr-index, -1/not-found
break-if-=
var global-data-ah/eax: (addr handle array global) <- get globals, data
var global-data/eax: (addr array global) <- lookup *global-data-ah
var curr-offset/ebx: (offset global) <- compute-offset global-data, curr-index
var curr/ebx: (addr global) <- index global-data, curr-offset
var curr-value/eax: (addr handle cell) <- get curr, value
copy-object curr-value, out
return
}
}
# return the index in globals containing 'sym'
# or -1 if not found
fn find-symbol-in-globals _globals: (addr global-table), sym-name: (addr stream byte) -> _/ecx: int {
var globals/esi: (addr global-table) <- copy _globals
compare globals, 0
{
break-if-!=
return -1/not-found
}
var global-data-ah/eax: (addr handle array global) <- get globals, data
var global-data/eax: (addr array global) <- lookup *global-data-ah
var final-index/ecx: (addr int) <- get globals, final-index
var curr-index/ecx: int <- copy *final-index
{
compare curr-index, 0
break-if-<
var curr-offset/ebx: (offset global) <- compute-offset global-data, curr-index
var curr/ebx: (addr global) <- index global-data, curr-offset
var curr-name-ah/eax: (addr handle array byte) <- get curr, name
var curr-name/eax: (addr array byte) <- lookup *curr-name-ah
var found?/eax: boolean <- stream-data-equal? sym-name, curr-name
compare found?, 0/false
{
break-if-=
return curr-index
}
curr-index <- decrement
loop
}
return -1/not-found
}
# return the index in globals containing 'sym'
# or -1 if not found
fn find-symbol-name-in-globals _globals: (addr global-table), sym-name: (addr array byte) -> _/ecx: int {
var globals/esi: (addr global-table) <- copy _globals
compare globals, 0
{
break-if-!=
return -1/not-found
}
var global-data-ah/eax: (addr handle array global) <- get globals, data
var global-data/eax: (addr array global) <- lookup *global-data-ah
var final-index/ecx: (addr int) <- get globals, final-index
var curr-index/ecx: int <- copy *final-index
{
compare curr-index, 0
break-if-<
var curr-offset/ebx: (offset global) <- compute-offset global-data, curr-index
var curr/ebx: (addr global) <- index global-data, curr-offset
var curr-name-ah/eax: (addr handle array byte) <- get curr, name
var curr-name/eax: (addr array byte) <- lookup *curr-name-ah
var found?/eax: boolean <- string-equal? sym-name, curr-name
compare found?, 0/false
{
break-if-=
return curr-index
}
curr-index <- decrement
loop
}
return -1/not-found
}
fn mutate-binding-in-globals name: (addr stream byte), val: (addr handle cell), _globals: (addr global-table), trace: (addr trace) {
var globals/esi: (addr global-table) <- copy _globals
{
compare globals, 0
break-if-=
var curr-index/ecx: int <- find-symbol-in-globals globals, name
compare curr-index, -1/not-found
break-if-=
var global-data-ah/eax: (addr handle array global) <- get globals, data
var global-data/eax: (addr array global) <- lookup *global-data-ah
var curr-offset/ebx: (offset global) <- compute-offset global-data, curr-index
var curr/ebx: (addr global) <- index global-data, curr-offset
var dest/eax: (addr handle cell) <- get curr, value
copy-object val, dest
return
}
# otherwise error "unbound symbol: ", sym
var stream-storage: (stream byte 0x40)
var stream/ecx: (addr stream byte) <- address stream-storage
write stream, "unbound symbol: "
rewind-stream name
write-stream stream, name
error-stream trace, stream
}
# Accepts an input s-expression, naively checks if it is a definition, and if
# so saves the gap-buffer to the appropriate global, spinning up a new empty
# one to replace it with.
fn maybe-stash-gap-buffer-to-global _globals: (addr global-table), _definition-ah: (addr handle cell), gap: (addr handle gap-buffer) {
# if 'definition' is not a pair, return
var definition-ah/eax: (addr handle cell) <- copy _definition-ah
var _definition/eax: (addr cell) <- lookup *definition-ah
var definition/esi: (addr cell) <- copy _definition
var definition-type/eax: (addr int) <- get definition, type
compare *definition-type, 0/pair
{
break-if-=
return
}
# if definition->left is neither "define" nor "set", return
var left-ah/eax: (addr handle cell) <- get definition, left
var _left/eax: (addr cell) <- lookup *left-ah
var left/ecx: (addr cell) <- copy _left
{
var def?/eax: boolean <- symbol-equal? left, "define"
compare def?, 0/false
break-if-!=
var set?/eax: boolean <- symbol-equal? left, "set"
compare set?, 0/false
break-if-!=
return
}
# locate the global for definition->right->left
var right-ah/eax: (addr handle cell) <- get definition, right
var right/eax: (addr cell) <- lookup *right-ah
var defined-symbol-ah/eax: (addr handle cell) <- get right, left
var defined-symbol/eax: (addr cell) <- lookup *defined-symbol-ah
var defined-symbol-name-ah/eax: (addr handle stream byte) <- get defined-symbol, text-data
var defined-symbol-name/eax: (addr stream byte) <- lookup *defined-symbol-name-ah
var index/ecx: int <- find-symbol-in-globals _globals, defined-symbol-name
{
compare index, -1/not-found
break-if-!=
return
}
# stash 'gap' to it
var globals/eax: (addr global-table) <- copy _globals
compare globals, 0
{
break-if-!=
abort "stash to globals"
return
}
var global-data-ah/eax: (addr handle array global) <- get globals, data
var global-data/eax: (addr array global) <- lookup *global-data-ah
var offset/ebx: (offset global) <- compute-offset global-data, index
var dest-global/eax: (addr global) <- index global-data, offset
var dest-ah/eax: (addr handle gap-buffer) <- get dest-global, input
copy-object gap, dest-ah
# initialize a new gap-buffer in 'gap'
var dest/eax: (addr gap-buffer) <- lookup *dest-ah
var capacity/ecx: int <- gap-buffer-capacity dest
var gap2/eax: (addr handle gap-buffer) <- copy gap
allocate gap2
var gap-addr/eax: (addr gap-buffer) <- lookup *gap2
initialize-gap-buffer gap-addr, capacity
}
# Accepts an input s-expression, naively checks if it is a definition, and if
# so saves the gap-buffer to the appropriate global.
fn move-gap-buffer-to-global _globals: (addr global-table), _definition-ah: (addr handle cell), gap: (addr handle gap-buffer) {
# if 'definition' is not a pair, return
var definition-ah/eax: (addr handle cell) <- copy _definition-ah
var _definition/eax: (addr cell) <- lookup *definition-ah
var definition/esi: (addr cell) <- copy _definition
var definition-type/eax: (addr int) <- get definition, type
compare *definition-type, 0/pair
{
break-if-=
return
}
# if definition->left is neither "define" nor "set", return
var left-ah/eax: (addr handle cell) <- get definition, left
var _left/eax: (addr cell) <- lookup *left-ah
var left/ecx: (addr cell) <- copy _left
{
var def?/eax: boolean <- symbol-equal? left, "define"
compare def?, 0/false
break-if-!=
var set?/eax: boolean <- symbol-equal? left, "set"
compare set?, 0/false
break-if-!=
return
}
# locate the global for definition->right->left
var right-ah/eax: (addr handle cell) <- get definition, right
var right/eax: (addr cell) <- lookup *right-ah
var defined-symbol-ah/eax: (addr handle cell) <- get right, left
var defined-symbol/eax: (addr cell) <- lookup *defined-symbol-ah
var defined-symbol-name-ah/eax: (addr handle stream byte) <- get defined-symbol, text-data
var defined-symbol-name/eax: (addr stream byte) <- lookup *defined-symbol-name-ah
var index/ecx: int <- find-symbol-in-globals _globals, defined-symbol-name
{
compare index, -1/not-found
break-if-!=
return
}
# move 'gap' to it
var globals/eax: (addr global-table) <- copy _globals
compare globals, 0
{
break-if-!=
abort "move to globals"
return
}
var global-data-ah/eax: (addr handle array global) <- get globals, data
var global-data/eax: (addr array global) <- lookup *global-data-ah
var offset/ebx: (offset global) <- compute-offset global-data, index
var dest-global/eax: (addr global) <- index global-data, offset
var dest-ah/eax: (addr handle gap-buffer) <- get dest-global, input
copy-object gap, dest-ah
}
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