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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 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
# don't move the cursor or anything
fn render-stack-from-bottom _self: (addr grapheme-stack), screen: (addr screen) {
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/eax: int <- copy 0
{
compare i, *top-addr
break-if->=
var g/edx: (addr grapheme) <- index data, i
print-grapheme screen, *g
i <- increment
loop
}
}
# dump stack to screen from top to bottom
# don't move the cursor or anything
fn render-stack-from-top _self: (addr grapheme-stack), screen: (addr screen) {
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/eax: int <- copy *top-addr
i <- decrement
{
compare i, 0
break-if-<
var g/edx: (addr grapheme) <- index data, i
print-grapheme screen, *g
i <- decrement
loop
}
}
# 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 <- is-decimal-digit? *g
compare result, 0/false
break-if-=
i <- increment
loop
}
return result
}
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