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author | Kartik Agaram <vc@akkartik.com> | 2020-06-05 22:49:55 -0700 |
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committer | Kartik Agaram <vc@akkartik.com> | 2020-06-05 22:49:55 -0700 |
commit | 3e33219b0701b330359f140b03da5cea10bae804 (patch) | |
tree | aa02deed449e1ae069da495e97c8d7b93fc7e0ec /prototypes/browse/25-soft-newlines/screen-position-state.mu | |
parent | ee9e20429a75cf97d3786a2fac730b28b0353f86 (diff) | |
download | mu-3e33219b0701b330359f140b03da5cea10bae804.tar.gz |
6486
Diffstat (limited to 'prototypes/browse/25-soft-newlines/screen-position-state.mu')
-rw-r--r-- | prototypes/browse/25-soft-newlines/screen-position-state.mu | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/prototypes/browse/25-soft-newlines/screen-position-state.mu b/prototypes/browse/25-soft-newlines/screen-position-state.mu new file mode 100644 index 00000000..62161108 --- /dev/null +++ b/prototypes/browse/25-soft-newlines/screen-position-state.mu @@ -0,0 +1,164 @@ +type screen-position-state { + nrows: int # const + ncols: int # const + toprow: int + botrow: int + leftcol: int + rightcol: int + row: int + col: int +} + +fn init-screen-position-state _self: (addr screen-position-state) { + # hardcoded parameters: + # top-margin + # page-margin + # page-width + var self/esi: (addr screen-position-state) <- copy _self + var nrows/eax: int <- copy 0 + var ncols/ecx: int <- copy 0 + nrows, ncols <- screen-size + var dest/edx: (addr int) <- copy 0 + # self->nrows = nrows + dest <- get self, nrows + copy-to *dest, nrows + # self->ncols = ncols + dest <- get self, ncols + copy-to *dest, ncols + # self->toprow = top-margin + dest <- get self, toprow + copy-to *dest, 2 # top-margin + # self->botrow = nrows + dest <- get self, botrow + copy-to *dest, nrows + # + start-drawing self +} + +fn start-drawing _self: (addr screen-position-state) { + var self/esi: (addr screen-position-state) <- copy _self + var tmp/eax: (addr int) <- copy 0 + var tmp2/ecx: int <- copy 0 + clear-screen + # self->leftcol = page-margin + tmp <- get self, leftcol + copy-to *tmp, 5 # left-margin + # self->rightcol = self->leftcol + page-width + tmp <- get self, rightcol + copy-to *tmp, 0x45 # left-margin + page-width + # self->row = self->toprow + tmp <- get self, toprow + tmp2 <- copy *tmp + tmp <- get self, row + copy-to *tmp, tmp2 + # self->col = self->leftcol + tmp <- get self, leftcol + tmp2 <- copy *tmp + tmp <- get self, col + copy-to *tmp, tmp2 + # + reposition-cursor self +} + +fn add-char _self: (addr screen-position-state), c: byte { +$add-char:body: { + var self/esi: (addr screen-position-state) <- copy _self + { + compare c, 0xa # newline + break-if-!= + next-line self + reposition-cursor self + break $add-char:body + } + # print c + print-byte c + # self->col++ + var tmp/eax: (addr int) <- get self, col + increment *tmp + # if (self->col > self->rightcol) next-line(self) + var tmp2/ecx: int <- copy *tmp + tmp <- get self, rightcol + compare tmp2, *tmp + { + break-if-<= + next-line self + reposition-cursor self + } +} +} + +fn next-line _self: (addr screen-position-state) { + var self/esi: (addr screen-position-state) <- copy _self + var tmp/eax: (addr int) <- copy 0 + var tmp2/ecx: int <- copy 0 + # self->col = self->leftcol + tmp <- get self, leftcol + tmp2 <- copy *tmp + tmp <- get self, col + copy-to *tmp, tmp2 + # self->row++ + tmp <- get self, row + increment *tmp + # if (self->row > self->botrow) next-page(self) + tmp2 <- copy *tmp + tmp <- get self, botrow + compare tmp2, *tmp + { + break-if-<= + next-page self + } +} + +fn next-page _self: (addr screen-position-state) { + var self/esi: (addr screen-position-state) <- copy _self + var tmp/eax: (addr int) <- copy 0 + var tmp2/ecx: int <- copy 0 + # self->leftcol = self->rightcol + page-margin + tmp <- get self, rightcol + tmp2 <- copy *tmp + tmp2 <- add 5 # page-margin + tmp <- get self, leftcol + copy-to *tmp, tmp2 + # self->rightcol = self->leftcol + page-width + tmp2 <- copy *tmp + tmp2 <- add 0x40 # page-width + tmp <- get self, rightcol + copy-to *tmp, tmp2 + # self->row = self->toprow + tmp <- get self, toprow + tmp2 <- copy *tmp + tmp <- get self, row + copy-to *tmp, tmp2 + # self->col = self->leftcol + tmp <- get self, leftcol + tmp2 <- copy *tmp + tmp <- get self, col + copy-to *tmp, tmp2 +} + +fn done-drawing? _self: (addr screen-position-state) -> result/eax: boolean { +$done-drawing?:body: { + # return self->rightcol >= self->ncols + var self/esi: (addr screen-position-state) <- copy _self + var max/ecx: (addr int) <- get self, ncols + var tmp/eax: (addr int) <- get self, rightcol + var right/eax: int <- copy *tmp + compare right, *max + { + break-if->= + result <- copy 0 # false + break $done-drawing?:body + } + { + break-if-< + result <- copy 1 # true + } +} +} + +fn reposition-cursor _self: (addr screen-position-state) { + var self/esi: (addr screen-position-state) <- copy _self + var r/eax: (addr int) <- get self, row + var c/ecx: (addr int) <- get self, col + move-cursor *r *c +} |