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@ -220,9 +220,9 @@ var/reg <- length arr/reg2: (addr array T)
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If a record (product) type T was defined to have elements a, b, c, ... of
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types T_a, T_b, T_c, ..., then accessing one of those elements f of type T_f:
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var/reg: (addr T_f) <- get var2/reg2: (addr F), f
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var/reg: (addr T_f) <- get var2/reg2: (addr T), f
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=> "8d/copy-address *(" reg2 "+" offset(f) ") " reg "/r32"
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var/reg: (addr T_f) <- get var2: (addr F), f
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var/reg: (addr T_f) <- get var2: T, f
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=> "8d/copy-address *(ebp+" var2.stack-offset "+" offset(f) ") " reg "/r32"
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# Handles for safe access to the heap
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@ -215,7 +215,7 @@ Similarly, conditional loops:
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var/reg: (addr T_f) <- get var/reg: (addr T), f
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where record (product) type T has elements a, b, c, ... of types T_a, T_b, T_c, ...
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var/reg: (addr T_f) <- get var: (addr T), f
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var/reg: (addr T_f) <- get var: T, f
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## Handles for safe access to the heap
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@ -1,8 +1,6 @@
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fn main args: (addr array (addr array byte)) -> exit-status/ebx: int {
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# initialize fs from args[1]
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var filename/eax: (addr array byte) <- first-arg args
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#? print-string filename
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#? print-string "\n"
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var file-state-storage: file-state
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var fs/esi: (addr file-state) <- address file-state-storage
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init-file-state fs, filename
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@ -0,0 +1,5 @@
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Fill in screen state code.
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It's not quite working yet. Lines don't wrap.
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But at least we're moving the cursor correctly before we start drawing.
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@ -0,0 +1,44 @@
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type file-state {
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source: (handle buffered-file)
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eof?: boolean
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}
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fn init-file-state _self: (addr file-state), filename: (addr array byte) {
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var self/eax: (addr file-state) <- copy _self
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load-file self, filename
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var eof/eax: (addr boolean) <- get self, eof?
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copy-to *eof, 0 # false
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}
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fn load-file _self: (addr file-state), filename: (addr array byte) {
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var self/eax: (addr file-state) <- copy _self
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var out/esi: (addr handle buffered-file) <- get self, source
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open filename, 0, out # 0 = read mode
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}
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fn next-char _self: (addr file-state) -> result/eax: byte {
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var self/ecx: (addr file-state) <- copy _self
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var source/eax: (addr handle buffered-file) <- get self, source
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var in/eax: (addr buffered-file) <- lookup *source
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result <- read-byte-buffered in
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# if result == EOF, set eof?
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compare result, 0xffffffff # EOF marker
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{
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var eof/ecx: (addr boolean) <- get self, eof?
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copy-to *eof, 1 # true
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}
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}
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fn done-reading? _self: (addr file-state) -> result/eax: boolean {
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var self/eax: (addr file-state) <- copy _self
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var eof/eax: (addr boolean) <- get self, eof?
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result <- copy *eof
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}
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fn dump in: (addr buffered-file) {
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var c/eax: byte <- read-byte-buffered in
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compare c, 0xffffffff # EOF marker
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break-if-=
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print-byte c
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loop
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}
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@ -0,0 +1,50 @@
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fn main args: (addr array (addr array byte)) -> exit-status/ebx: int {
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# initialize fs from args[1]
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var filename/eax: (addr array byte) <- first-arg args
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var file-state-storage: file-state
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var fs/esi: (addr file-state) <- address file-state-storage
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init-file-state fs, filename
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#
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enable-screen-grid-mode
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enable-keyboard-immediate-mode
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# initialize screen state from screen size
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var screen-position-state-storage: screen-position-state
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var screen-position-state/eax: (addr screen-position-state) <- address screen-position-state-storage
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init-screen-position-state screen-position-state
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{
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render fs, screen-position-state
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var key/eax: byte <- read-key
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}
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enable-keyboard-type-mode
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enable-screen-type-mode
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exit-status <- copy 0
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}
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fn render fs: (addr file-state), state: (addr screen-position-state) {
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start-drawing state
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render-normal fs, state
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}
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fn render-normal fs: (addr file-state), state: (addr screen-position-state) {
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{
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# if done-drawing?(state) break
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var done?/eax: boolean <- done-drawing? state
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compare done?, 0 # false
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break-if-!=
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#
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var c/eax: byte <- next-char fs
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# if (c == EOF) break
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compare c, 0xffffffff # EOF marker
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break-if-=
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#
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print-byte c
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#
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loop
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}
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}
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fn first-arg args-on-stack: (addr array (addr array byte)) -> out/eax: (addr array byte) {
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var args/eax: (addr array (addr array byte)) <- copy args-on-stack
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var result/eax: (addr addr array byte) <- index args, 1
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out <- copy *result
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}
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@ -0,0 +1,128 @@
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type screen-position-state {
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nrows: int # const
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ncols: int # const
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toprow: int
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botrow: int
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leftcol: int
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rightcol: int
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row: int
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col: int
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}
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fn init-screen-position-state _self: (addr screen-position-state) {
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# hardcoded parameters:
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# top-margin
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# page-margin
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# text-width
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# page-height (temporary)
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var self/esi: (addr screen-position-state) <- copy _self
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var nrows/eax: int <- copy 0
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var ncols/ecx: int <- copy 0
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nrows, ncols <- screen-size
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var dest/edx: (addr int) <- copy 0
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# self->nrows = nrows
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dest <- get self, nrows
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copy-to *dest, nrows
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# self->ncols = ncols
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dest <- get self, ncols
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copy-to *dest, ncols
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# self->toprow = top-margin
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dest <- get self, toprow
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copy-to *dest, 2 # top-margin
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# self->botrow = nrows
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dest <- get self, botrow
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copy-to *dest, 0x22 # top-margin + page-height
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# self->leftcol = page-margin
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dest <- get self, leftcol
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copy-to *dest, 5 # left-margin
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# self->rightcol = self->leftcol + text-width
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dest <- get self, rightcol
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copy-to *dest, 0x45 # left-margin + text-width
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#
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start-drawing self
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}
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fn start-drawing _self: (addr screen-position-state) {
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var self/esi: (addr screen-position-state) <- copy _self
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var tmp/eax: (addr int) <- copy 0
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var tmp2/ecx: int <- copy 0
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# self->row = self->toprow
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tmp <- get self, toprow
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tmp2 <- copy *tmp
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tmp <- get self, row
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copy-to *tmp, tmp2
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# self->col = self->leftcol
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tmp <- get self, leftcol
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tmp2 <- copy *tmp
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tmp <- get self, col
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copy-to *tmp, tmp2
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#
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reposition-cursor self
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}
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fn add-char _self: (addr screen-position-state), c: byte {
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var self/esi: (addr screen-position-state) <- copy _self
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# print c
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print-byte c
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# self->col++
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var tmp/eax: (addr int) <- get self, col
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increment *tmp
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# if (self->col > self->rightcol) next-line(self)
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var tmp2/ecx: int <- copy *tmp
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tmp <- get self, rightcol
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compare tmp2, *tmp
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{
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break-if-<=
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next-line self
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reposition-cursor self
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}
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}
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fn next-line _self: (addr screen-position-state) {
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var self/esi: (addr screen-position-state) <- copy _self
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# self->row++
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var tmp/eax: (addr int) <- get self, row
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increment *tmp
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# if (self->row > self->botrow) next-page(self)
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var tmp2/ecx: int <- copy *tmp
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tmp <- get self, botrow
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compare tmp2, *tmp
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{
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break-if-<=
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next-page self
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}
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}
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fn next-page _self: (addr screen-position-state) {
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var self/esi: (addr screen-position-state) <- copy _self
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# TMP
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var tmp/eax: (addr int) <- get self, row
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increment *tmp
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}
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fn done-drawing? _self: (addr screen-position-state) -> result/eax: boolean {
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var self/esi: (addr screen-position-state) <- copy _self
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# TMP
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var r/eax: (addr int) <- get self, row
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var tmp/ecx: (addr int) <- get self, botrow
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var max/ecx: int <- copy *tmp
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$done-drawing?:check: {
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compare *r, max
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{
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break-if->=
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result <- copy 0 # false
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break $done-drawing?:check
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}
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{
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break-if-<
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result <- copy 1 # true
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}
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}
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}
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fn reposition-cursor _self: (addr screen-position-state) {
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var self/esi: (addr screen-position-state) <- copy _self
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var r/eax: (addr int) <- get self, row
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var c/ecx: (addr int) <- get self, col
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move-cursor *r *c
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}
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