# grapheme stacks are the smallest unit of editable text
type grapheme-stack {
data: (handle array grapheme)
top: int
}
fn initialize-grapheme-stack _self: (addr grapheme-stack), n: int {
var self/esi: (addr grapheme-stack) <- copy _self
var d/edi: (addr handle array grapheme) <- get self, data
populate d, n
var top/eax: (addr int) <- get self, top
copy-to *top, 0
}
fn clear-grapheme-stack _self: (addr grapheme-stack) {
var self/esi: (addr grapheme-stack) <- copy _self
var top/eax: (addr int) <- get self, top
copy-to *top, 0
}
fn grapheme-stack-empty? _self: (addr grapheme-stack) -> _/eax: boolean {
var self/esi: (addr grapheme-stack) <- copy _self
var top/eax: (addr int) <- get self, top
compare *top, 0
{
break-if-!=
return 1/true
}
return 0/false
}
fn grapheme-stack-length _self: (addr grapheme-stack) -> _/eax: int {
var self/esi: (addr grapheme-stack) <- copy _self
var top/eax: (addr int) <- get self, top
return *top
}
fn push-grapheme-stack _self: (addr grapheme-stack), _val: grapheme {
var self/esi: (addr grapheme-stack) <- copy _self
var top-addr/ecx: (addr int) <- get self, top
var data-ah/edx: (addr handle array grapheme) <- get self, data
var data/eax: (addr array grapheme) <- lookup *data-ah
var top/edx: int <- copy *top-addr
var dest-addr/edx: (addr grapheme) <- index data, top
var val/eax: grapheme <- copy _val
copy-to *dest-addr, val
add-to *top-addr, 1
}
fn pop-grapheme-stack _self: (addr grapheme-stack) -> _/eax: grapheme {
var self/esi: (addr grapheme-stack) <- copy _self
var top-addr/ecx: (addr int) <- get self, top
{
compare *top-addr, 0
break-if->
return -1
}
subtract-from *top-addr, 1
var data-ah/edx: (addr handle array grapheme) <- get self, data
var data/eax: (addr array grapheme) <- lookup *data-ah
var top/edx: int <- copy *top-addr
var result-addr/eax: (addr grapheme) <- index data, top
return *result-addr
}
fn copy-grapheme-stack _src: (addr grapheme-stack), dest: (addr grapheme-stack) {
var src/esi: (addr grapheme-stack) <- copy _src
var data-ah/edi: (addr handle array grapheme) <- get src, data
var _data/eax: (addr array grapheme) <- lookup *data-ah
var data/edi: (addr array grapheme) <- copy _data
var top-addr/ecx: (addr int) <- get src, top
var i/eax: int <- copy 0
{
compare i, *top-addr
break-if->=
var g/edx: (addr grapheme) <- index data, i
push-grapheme-stack dest, *g
i <- increment
loop
}
}
# dump stack to screen from bottom to top
# hardcoded colors:
# matching paren
fn render-stack-from-bottom-wrapping-right-then-down screen: (addr screen), _self: (addr grapheme-stack), xmin: int, ymin: int, xmax: int, ymax: int, _x: int, _y: int, highlight-matching-open-paren?: boolean, open-paren-depth: int, color: int, background-color: int -> _/eax: int, _/ecx: int {
var self/esi: (addr grapheme-stack) <- copy _self
var matching-open-paren-index/edx: int <- get-matching-open-paren-index self, highlight-matching-open-paren?, open-paren-depth
var data-ah/edi: (addr handle array grapheme) <- get self, data
var _data/eax: (addr array grapheme) <- lookup *data-ah
var data/edi: (addr array grapheme) <- copy _data
var x/eax: int <- copy _x
var y/ecx: int <- copy _y
var top-addr/esi: (addr int) <- get self, top
var i/ebx: int <- copy 0
{
compare i, *top-addr
break-if->=
{
var g/esi: (addr grapheme) <- index data, i
var fg: int
{
var tmp/eax: int <- copy color
copy-to fg, tmp
}
{
compare i, matching-open-paren-index
break-if-!=
copy-to fg, 0xf/highlight
}
x, y <- render-grapheme screen, *g, xmin, ymin, xmax, ymax, x, y, fg, background-color
}
i <- increment
loop
}
return x, y
}
# helper for small words
fn render-stack-from-bottom screen: (addr screen), self: (addr grapheme-stack), x: int, y: int, highlight-matching-open-paren?: boolean, open-paren-depth: int -> _/eax: int {
var _width/eax: int <- copy 0
var _height/ecx: int <- copy 0
_width, _height <- screen-size screen
var width/edx: int <- copy _width
var height/ebx: int <- copy _height
var x2/eax: int <- copy 0
var y2/ecx: int <- copy 0
x2, y2 <- render-stack-from-bottom-wrapping-right-then-down screen, self, x, y, width, height, x, y, highlight-matching-open-paren?, open-paren-depth, 3/fg=cyan, 0xc5/bg=blue-bg
return x2 # y2? yolo
}
# dump stack to screen from top to bottom
# optionally render a 'cursor' with the top grapheme
# hard-coded colors:
# matching paren
# cursor
fn render-stack-from-top-wrapping-right-then-down screen: (addr screen), _self: (addr grapheme-stack), xmin: int, ymin: int, xmax: int, ymax: int, _x: int, _y: int, render-cursor?: boolean, color: int, background-color: int -> _/eax: int, _/ecx: int {
var self/esi: (addr grapheme-stack) <- copy _self
var matching-close-paren-index/edx: int <- get-matching-close-paren-index self, render-cursor?
var data-ah/eax: (addr handle array grapheme) <- get self, data
var _data/eax: (addr array grapheme) <- lookup *data-ah
var data/edi: (addr array grapheme) <- copy _data
var x/eax: int <- copy _x
var y/ecx: int <- copy _y
var top-addr/ebx: (addr int) <- get self, top
var i/ebx: int <- copy *top-addr
i <- decrement
# if render-cursor?, peel off first iteration
{
compare render-cursor?, 0/false
break-if-=
compare i, 0
break-if-<
var g/esi: (addr grapheme) <- index data, i
x, y <- render-grapheme screen, *g, xmin, ymin, xmax, ymax, x, y, background-color, color
i <- decrement
}
# remaining iterations
{
compare i, 0
break-if-<
# highlight matching paren if needed
var fg: int
{
var tmp/eax: int <- copy color
copy-to fg, tmp
}
compare i, matching-close-paren-index
{
break-if-!=
copy-to fg, 0xf/highlight
}
#
var g/esi: (addr grapheme) <- index data, i
x, y <- render-grapheme screen, *g, xmin, ymin, xmax, ymax, x, y, fg, background-color
i <- decrement
loop
}
return x, y
}
# helper for small words
fn render-stack-from-top screen: (addr screen), self: (addr grapheme-stack), x: int, y: int, render-cursor?: boolean -> _/eax: int {
var _width/eax: int <- copy 0
var _height/ecx: int <- copy 0
_width, _height <- screen-size screen
var width/edx: int <- copy _width
var height/ebx: int <- copy _height
var x2/eax: int <- copy 0
var y2/ecx: int <- copy 0
x2, y2 <- render-stack-from-top-wrapping-right-then-down screen, self, x, y, width, height, x, y, render-cursor?, 3/fg=cyan, 0xc5/bg=blue-bg
return x2 # y2? yolo
}
fn test-render-grapheme-stack {
# setup: gs = "abc"
var gs-storage: grapheme-stack
var gs/edi: (addr grapheme-stack) <- address gs-storage
initialize-grapheme-stack gs, 5
var g/eax: grapheme <- copy 0x61/a
push-grapheme-stack gs, g
g <- copy 0x62/b
push-grapheme-stack gs, g
g <- copy 0x63/c
push-grapheme-stack gs, g
# setup: screen
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 4, 0/no-pixel-graphics
#
var x/eax: int <- render-stack-from-bottom screen, gs, 0/x, 0/y, 0/no-highlight-matching-open-paren, 0/open-paren-depth
check-screen-row screen, 0/y, "abc ", "F - test-render-grapheme-stack from bottom"
check-ints-equal x, 3, "F - test-render-grapheme-stack from bottom: result"
check-background-color-in-screen-row screen, 3/bg=reverse, 0/y, " ", "F - test-render-grapheme-stack from bottom: bg"
#
var x/eax: int <- render-stack-from-top screen, gs, 0/x, 1/y, 0/cursor=false
check-screen-row screen, 1/y, "cba ", "F - test-render-grapheme-stack from top without cursor"
check-ints-equal x, 3, "F - test-render-grapheme-stack from top without cursor: result"
check-background-color-in-screen-row screen, 3/bg=reverse, 1/y, " ", "F - test-render-grapheme-stack from top without cursor: bg"
#
var x/eax: int <- render-stack-from-top screen, gs, 0/x, 2/y, 1/cursor=true
check-screen-row screen, 2/y, "cba ", "F - test-render-grapheme-stack from top with cursor"
check-ints-equal x, 3, "F - test-render-grapheme-stack from top with cursor: result"
check-background-color-in-screen-row screen, 3/bg=reverse, 2/y, "| ", "F - test-render-grapheme-stack from top with cursor: bg"
}
fn test-render-grapheme-stack-while-highlighting-matching-close-paren {
# setup: gs = "(b)"
var gs-storage: grapheme-stack
var gs/edi: (addr grapheme-stack) <- address gs-storage
initialize-grapheme-stack gs, 5
var g/eax: grapheme <- copy 0x29/close-paren
push-grapheme-stack gs, g
g <- copy 0x62/b
push-grapheme-stack gs, g
g <- copy 0x28/open-paren
push-grapheme-stack gs, g
# setup: screen
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 4, 0/no-pixel-graphics
#
var x/eax: int <- render-stack-from-top screen, gs, 0/x, 2/y, 1/cursor=true
check-screen-row screen, 2/y, "(b) ", "F - test-render-grapheme-stack-while-highlighting-matching-close-paren"
check-background-color-in-screen-row screen, 3/bg=reverse, 2/y, "| ", "F - test-render-grapheme-stack-while-highlighting-matching-close-paren: cursor"
check-screen-row-in-color screen, 0xf/fg=white, 2/y, " ) ", "F - test-render-grapheme-stack-while-highlighting-matching-close-paren: matching paren"
}
fn test-render-grapheme-stack-while-highlighting-matching-close-paren-2 {
# setup: gs = "(a (b)) c"
var gs-storage: grapheme-stack
var gs/edi: (addr grapheme-stack) <- address gs-storage
initialize-grapheme-stack gs, 0x10
var g/eax: grapheme <- copy 0x63/c
push-grapheme-stack gs, g
g <- copy 0x20/space
push-grapheme-stack gs, g
g <- copy 0x29/close-paren
push-grapheme-stack gs, g
g <- copy 0x29/close-paren
push-grapheme-stack gs, g
g <- copy 0x62/b
push-grapheme-stack gs, g
g <- copy 0x28/open-paren
push-grapheme-stack gs, g
g <- copy 0x20/space
push-grapheme-stack gs, g
g <- copy 0x61/a
push-grapheme-stack gs, g
g <- copy 0x28/open-paren
push-grapheme-stack gs, g
# setup: screen
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 4, 0/no-pixel-graphics
#
var x/eax: int <- render-stack-from-top screen, gs, 0/x, 2/y, 1/cursor=true
check-screen-row screen, 2/y, "(a (b)) c ", "F - test-render-grapheme-stack-while-highlighting-matching-close-paren-2"
check-background-color-in-screen-row screen, 3/bg=reverse, 2/y, "| ", "F - test-render-grapheme-stack-while-highlighting-matching-close-paren-2: cursor"
check-screen-row-in-color screen, 0xf/fg=white, 2/y, " ) ", "F - test-render-grapheme-stack-while-highlighting-matching-close-paren-2: matching paren"
}
fn test-render-grapheme-stack-while-highlighting-matching-open-paren-with-close-paren-at-end {
# setup: gs = "(b)"
var gs-storage: grapheme-stack
var gs/edi: (addr grapheme-stack) <- address gs-storage
initialize-grapheme-stack gs, 5
var g/eax: grapheme <- copy 0x28/open-paren
push-grapheme-stack gs, g
g <- copy 0x62/b
push-grapheme-stack gs, g
g <- copy 0x29/close-paren
push-grapheme-stack gs, g
# setup: screen
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 4, 0/no-pixel-graphics
#
var x/eax: int <- render-stack-from-bottom screen, gs, 0/x, 2/y, 1/highlight-matching-open-paren, 1/open-paren-depth
check-screen-row screen, 2/y, "(b) ", "F - test-render-grapheme-stack-while-highlighting-matching-open-paren-with-close-paren-at-end"
check-screen-row-in-color screen, 0xf/fg=white, 2/y, "( ", "F - test-render-grapheme-stack-while-highlighting-matching-open-paren-with-close-paren-at-end: matching paren"
}
fn test-render-grapheme-stack-while-highlighting-matching-open-paren-with-close-paren-at-end-2 {
# setup: gs = "a((b))"
var gs-storage: grapheme-stack
var gs/edi: (addr grapheme-stack) <- address gs-storage
initialize-grapheme-stack gs, 0x10
var g/eax: grapheme <- copy 0x61/a
push-grapheme-stack gs, g
g <- copy 0x28/open-paren
push-grapheme-stack gs, g
g <- copy 0x28/open-paren
push-grapheme-stack gs, g
g <- copy 0x62/b
push-grapheme-stack gs, g
g <- copy 0x29/close-paren
push-grapheme-stack gs, g
g <- copy 0x29/close-paren
push-grapheme-stack gs, g
# setup: screen
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 4, 0/no-pixel-graphics
#
var x/eax: int <- render-stack-from-bottom screen, gs, 0/x, 2/y, 1/highlight-matching-open-paren, 1/open-paren-depth
check-screen-row screen, 2/y, "a((b)) ", "F - test-render-grapheme-stack-while-highlighting-matching-open-paren-with-close-paren-at-end-2"
check-screen-row-in-color screen, 0xf/fg=white, 2/y, " ( ", "F - test-render-grapheme-stack-while-highlighting-matching-open-paren-with-close-paren-at-end-2: matching paren"
}
fn test-render-grapheme-stack-while-highlighting-matching-open-paren {
# setup: gs = "(b"
var gs-storage: grapheme-stack
var gs/edi: (addr grapheme-stack) <- address gs-storage
initialize-grapheme-stack gs, 5
var g/eax: grapheme <- copy 0x28/open-paren
push-grapheme-stack gs, g
g <- copy 0x62/b
push-grapheme-stack gs, g
# setup: screen
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 4, 0/no-pixel-graphics
#
var x/eax: int <- render-stack-from-bottom screen, gs, 0/x, 2/y, 1/highlight-matching-open-paren, 0/open-paren-depth
check-screen-row screen, 2/y, "(b ", "F - test-render-grapheme-stack-while-highlighting-matching-open-paren"
check-screen-row-in-color screen, 0xf/fg=white, 2/y, "( ", "F - test-render-grapheme-stack-while-highlighting-matching-open-paren: matching paren"
}
fn test-render-grapheme-stack-while-highlighting-matching-open-paren-2 {
# setup: gs = "a((b)"
var gs-storage: grapheme-stack
var gs/edi: (addr grapheme-stack) <- address gs-storage
initialize-grapheme-stack gs, 0x10
var g/eax: grapheme <- copy 0x61/a
push-grapheme-stack gs, g
g <- copy 0x28/open-paren
push-grapheme-stack gs, g
g <- copy 0x28/open-paren
push-grapheme-stack gs, g
g <- copy 0x62/b
push-grapheme-stack gs, g
g <- copy 0x29/close-paren
push-grapheme-stack gs, g
# setup: screen
var screen-on-stack: screen
var screen/esi: (addr screen) <- address screen-on-stack
initialize-screen screen, 5, 4, 0/no-pixel-graphics
#
var x/eax: int <- render-stack-from-bottom screen, gs, 0/x, 2/y, 1/highlight-matching-open-paren, 0/open-paren-depth
check-screen-row screen, 2/y, "a((b) ", "F - test-render-grapheme-stack-while-highlighting-matching-open-paren-2"
check-screen-row-in-color screen, 0xf/fg=white, 2/y, " ( ", "F - test-render-grapheme-stack-while-highlighting-matching-open-paren-2: matching paren"
}
# return the index of the matching close-paren of the grapheme at cursor (top of stack)
# or top index if there's no matching close-paren
fn get-matching-close-paren-index _self: (addr grapheme-stack), render-cursor?: boolean -> _/edx: int {
var self/esi: (addr grapheme-stack) <- copy _self
var top-addr/edx: (addr int) <- get self, top
# if not rendering cursor, return
compare render-cursor?, 0/false
{
break-if-!=
return *top-addr
}
var data-ah/eax: (addr handle array grapheme) <- get self, data
var data/eax: (addr array grapheme) <- lookup *data-ah
var i/ecx: int <- copy *top-addr
# if stack is empty, return
compare i, 0
{
break-if->
return *top-addr
}
# if cursor is not '(' return
i <- decrement
var g/esi: (addr grapheme) <- index data, i
compare *g, 0x28/open-paren
{
break-if-=
return *top-addr
}
# otherwise scan to matching paren
var paren-count/ebx: int <- copy 1
i <- decrement
{
compare i, 0
break-if-<
var g/esi: (addr grapheme) <- index data, i
compare *g, 0x28/open-paren
{
break-if-!=
paren-count <- increment
}
compare *g, 0x29/close-paren
{
break-if-!=
compare paren-count, 1
{
break-if-!=
return i
}
paren-count <- decrement
}
i <- decrement
loop
}
return *top-addr
}
# return the index of the first open-paren at the given depth
# or top index if there's no matching close-paren
fn get-matching-open-paren-index _self: (addr grapheme-stack), control: boolean, depth: int -> _/edx: int {
var self/esi: (addr grapheme-stack) <- copy _self
var top-addr/edx: (addr int) <- get self, top
# if not rendering cursor, return
compare control, 0/false
{
break-if-!=
return *top-addr
}
var data-ah/eax: (addr handle array grapheme) <- get self, data
var data/eax: (addr array grapheme) <- lookup *data-ah
var i/ecx: int <- copy *top-addr
# if stack is empty, return
compare i, 0
{
break-if->
return *top-addr
}
# scan to matching open paren
var paren-count/ebx: int <- copy 0
i <- decrement
{
compare i, 0
break-if-<
var g/esi: (addr grapheme) <- index data, i
compare *g, 0x29/close-paren
{
break-if-!=
paren-count <- increment
}
compare *g, 0x28/open-paren
{
break-if-!=
compare paren-count, depth
{
break-if-!=
return i
}
paren-count <- decrement
}
i <- decrement
loop
}
return *top-addr
}
# compare from bottom
# beware: modifies 'stream', which must be disposed of after a false result
fn prefix-match? _self: (addr grapheme-stack), s: (addr stream byte) -> _/eax: boolean {
var self/esi: (addr grapheme-stack) <- copy _self
var data-ah/edi: (addr handle array grapheme) <- get self, data
var _data/eax: (addr array grapheme) <- lookup *data-ah
var data/edi: (addr array grapheme) <- copy _data
var top-addr/ecx: (addr int) <- get self, top
var i/ebx: int <- copy 0
{
compare i, *top-addr
break-if->=
# if curr != expected, return false
{
var curr-a/edx: (addr grapheme) <- index data, i
var expected/eax: grapheme <- read-grapheme s
{
compare expected, *curr-a
break-if-=
return 0/false
}
}
i <- increment
loop
}
return 1 # true
}
# compare from bottom
# beware: modifies 'stream', which must be disposed of after a false result
fn suffix-match? _self: (addr grapheme-stack), s: (addr stream byte) -> _/eax: boolean {
var self/esi: (addr grapheme-stack) <- copy _self
var data-ah/edi: (addr handle array grapheme) <- get self, data
var _data/eax: (addr array grapheme) <- lookup *data-ah
var data/edi: (addr array grapheme) <- copy _data
var top-addr/eax: (addr int) <- get self, top
var i/ebx: int <- copy *top-addr
i <- decrement
{
compare i, 0
break-if-<
{
var curr-a/edx: (addr grapheme) <- index data, i
var expected/eax: grapheme <- read-grapheme s
# if curr != expected, return false
{
compare expected, *curr-a
break-if-=
return 0/false
}
}
i <- decrement
loop
}
return 1 # true
}
fn grapheme-stack-is-decimal-integer? _self: (addr grapheme-stack) -> _/eax: boolean {
var self/esi: (addr grapheme-stack) <- copy _self
var data-ah/eax: (addr handle array grapheme) <- get self, data
var _data/eax: (addr array grapheme) <- lookup *data-ah
var data/edx: (addr array grapheme) <- copy _data
var top-addr/ecx: (addr int) <- get self, top
var i/ebx: int <- copy 0
var result/eax: boolean <- copy 1/true
$grapheme-stack-is-integer?:loop: {
compare i, *top-addr
break-if->=
var g/edx: (addr grapheme) <- index data, i
result <- decimal-digit? *g
compare result, 0/false
break-if-=
i <- increment
loop
}
return result
}