189 lines
5.3 KiB
Forth
189 lines
5.3 KiB
Forth
# Incomplete second attempt at parsing headings.
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#
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# This 'OO' approach seems more scalable. We hoist out all the outer framework
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# for deciding when to increment 'col', when to increment 'row' and when to
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# start a new page in a whole new part of the screen. Now it gets encapsulated
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# into a series of small helpers that can be called from multiple places.
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# Objects as coroutines.
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#
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# In spite of these advances, I need to first wrestle with a parsing issue.
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# This text has a heading:
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#
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# abc *def
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# # ghi*
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#
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# Ugh, so I can't do this translation in a single pass. At the first asterisk
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# there's just not enough information to know whether it starts a bold text or
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# not.
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#
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# Then again, maybe I should just keep going and not try to be compatible with
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# GitHub-Flavored Markdown. Require that new headings are also new paragraphs.
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fn main args: (addr array (addr array byte)) -> exit-status/ebx: int {
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var filename/eax: (addr array byte) <- first-arg args
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var file/esi: (addr buffered-file) <- load-file filename
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enable-screen-grid-mode
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enable-keyboard-immediate-mode
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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 0
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var screen-position-state-storage: screen-position-state
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var screen-position-state: (addr screen-position-state)
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init-screen-position-state screen-position-state, nrows, ncols
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{
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render file, screen-position-state
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var key/eax: byte <- read-key
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compare key, 0x71 # 'q'
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loop-if-!=
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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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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 render in: (addr buffered-file), state: (addr screen-position-state) {
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start-drawing state
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render-normal in, state
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}
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fn render-normal in: (addr buffered-file), 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
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break-if-!=
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#
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var c/eax: byte <- read-byte-buffered in
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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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# if (c == '*') start-bold 0,, render-until-asterisk(in, state), reset
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# else if (c == '_') start-bold 0,, render-until-underscore(in, state), reset
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# else if (c == '#') compute-color, start color, render-header-line(in, state), reset
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# else add-char(state, c)
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}
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}
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fn render-until-asterisk in: (addr buffered-file), 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
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break-if-!=
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#
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var c/eax: byte <- read-byte-buffered in
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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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# if (c == '*') break
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# else add-char(state, c)
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}
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}
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fn render-until-underscore in: (addr buffered-file), 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
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break-if-!=
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#
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var c/eax: byte <- read-byte-buffered in
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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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# if (c == '_') break
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# else add-char(state, c)
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}
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}
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fn render-header-line in: (addr buffered-file), 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
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break-if-!=
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#
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var c/eax: byte <- read-byte-buffered in
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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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# if (c == '*') break
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# else add-char(state, c)
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}
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}
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fn init-screen-position-state self: (addr screen-position-state), nrows: int, ncols: int {
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# hardcoded parameters:
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# top-margin
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# page-margin
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# page-width
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var dest/eax: (addr int) <- copy 0
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# self->nrows = nrows
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# self->ncols = ncols
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# self->toprow = top-margin
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# self->botrow = nrows
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# self->leftcol = page-margin
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# self->rightcol = self->leftcol + page-width
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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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# self->row = toprow
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# self->col = leftcol
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}
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fn add-char self: (addr screen-position-state), c: byte {
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# print c
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# self->col++
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# if (self->col > self->rightcol) next-line(self)
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}
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fn next-line self: (addr screen-position-state) {
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# self->row++
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# if (self->row > self->botrow) next-page(self)
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}
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fn next-page self: (addr screen-position-state) {
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# self->leftcol = self->rightcol + 5
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# self->rightcol = self->leftcol + page-width
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}
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fn done-drawing? self: (addr screen-position-state) -> result/eax: boolean {
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# self->rightcol >= self->ncols
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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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fn load-file filename: (addr array byte) -> out/esi: (addr buffered-file) {
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var result: (handle buffered-file)
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{
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var tmp1/eax: (addr handle buffered-file) <- address result
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open filename, 0, tmp1
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}
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var tmp2/eax: (addr buffered-file) <- lookup result
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out <- copy tmp2
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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 0, c
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loop
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}
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