260 lines
6.4 KiB
Forth
260 lines
6.4 KiB
Forth
fn main args: (addr array addr array byte) -> exit-status/ebx: int {
|
|
# initialize fs from args[1]
|
|
var filename/eax: (addr array byte) <- first-arg args
|
|
var file-state-storage: file-state
|
|
var fs/esi: (addr file-state) <- address file-state-storage
|
|
init-file-state fs, filename
|
|
#
|
|
enable-screen-grid-mode
|
|
enable-keyboard-immediate-mode
|
|
# initialize screen state from screen size
|
|
var screen-position-state-storage: screen-position-state
|
|
var screen-position-state/eax: (addr screen-position-state) <- address screen-position-state-storage
|
|
init-screen-position-state screen-position-state
|
|
normal-text
|
|
{
|
|
render fs, screen-position-state
|
|
var key/eax: byte <- read-key
|
|
compare key, 0x71 # 'q'
|
|
loop-if-!=
|
|
}
|
|
enable-keyboard-type-mode
|
|
enable-screen-type-mode
|
|
exit-status <- copy 0
|
|
}
|
|
|
|
fn render fs: (addr file-state), state: (addr screen-position-state) {
|
|
start-drawing state
|
|
render-normal fs, state
|
|
}
|
|
|
|
fn render-normal fs: (addr file-state), state: (addr screen-position-state) {
|
|
var newline-seen?/esi: boolean <- copy 0 # false
|
|
var start-of-paragraph?/edi: boolean <- copy 1 # true
|
|
$render-normal:loop: {
|
|
# if done-drawing?(state) break
|
|
var done?/eax: boolean <- done-drawing? state
|
|
compare done?, 0 # false
|
|
break-if-!=
|
|
#
|
|
var c/eax: byte <- next-char fs
|
|
# if (c == EOF) break
|
|
compare c, 0xffffffff # EOF marker
|
|
break-if-=
|
|
|
|
## if (c == newline) perform some fairly sophisticated parsing for soft newlines
|
|
compare c, 0xa # newline
|
|
{
|
|
break-if-!=
|
|
# if it's the first newline, buffer it
|
|
compare newline-seen?, 0
|
|
{
|
|
break-if-!=
|
|
newline-seen? <- copy 1 # true
|
|
loop $render-normal:loop
|
|
}
|
|
# otherwise render two newlines
|
|
{
|
|
break-if-=
|
|
add-char state, 0xa # newline
|
|
add-char state, 0xa # newline
|
|
newline-seen? <- copy 0 # false
|
|
start-of-paragraph? <- copy 1 # true
|
|
loop $render-normal:loop
|
|
}
|
|
}
|
|
# if start of paragraph and c == '#', switch to header
|
|
compare start-of-paragraph?, 0
|
|
{
|
|
break-if-=
|
|
compare c, 0x23 # '#'
|
|
{
|
|
break-if-!=
|
|
render-header-line fs, state
|
|
newline-seen? <- copy 1 # true
|
|
loop $render-normal:loop
|
|
}
|
|
}
|
|
# c is not a newline
|
|
start-of-paragraph? <- copy 0 # false
|
|
# if c is unprintable (particularly a '\r' CR), skip it
|
|
compare c, 0x20
|
|
loop-if-<
|
|
# If there's a newline buffered and c is a space, print the buffered
|
|
# newline (hard newline).
|
|
# If there's a newline buffered and c is not a newline or space, print a
|
|
# space (soft newline).
|
|
compare newline-seen?, 0 # false
|
|
$render-normal:flush-buffered-newline: {
|
|
break-if-=
|
|
newline-seen? <- copy 0 # false
|
|
{
|
|
compare c, 0x20
|
|
break-if-!=
|
|
add-char state, 0xa # newline
|
|
break $render-normal:flush-buffered-newline
|
|
}
|
|
add-char state, 0x20 # space
|
|
# fall through to print c
|
|
}
|
|
## end soft newline support
|
|
|
|
# if (c == '*') switch to bold
|
|
compare c, 0x2a # '*'
|
|
{
|
|
break-if-!=
|
|
start-bold 0
|
|
render-until-asterisk fs, state
|
|
normal-text
|
|
loop $render-normal:loop
|
|
}
|
|
# if (c == '_') switch to bold
|
|
compare c, 0x5f # '_'
|
|
{
|
|
break-if-!=
|
|
start-color 0, 0xec, 7 # 236 = darkish gray
|
|
start-bold 0
|
|
render-until-underscore fs, state
|
|
reset-formatting 0
|
|
start-color 0, 0xec, 7 # 236 = darkish gray
|
|
loop $render-normal:loop
|
|
}
|
|
#
|
|
add-char state, c
|
|
#
|
|
loop
|
|
} # $render-normal:loop
|
|
}
|
|
|
|
fn render-header-line fs: (addr file-state), state: (addr screen-position-state) {
|
|
$render-header-line:body: {
|
|
# compute color based on number of '#'s
|
|
var header-level/esi: int <- copy 1 # caller already grabbed one
|
|
var c/eax: byte <- copy 0
|
|
{
|
|
# if done-drawing?(state) return
|
|
{
|
|
var done?/eax: boolean <- done-drawing? state
|
|
compare done?, 0 # false
|
|
break-if-!= $render-header-line:body
|
|
}
|
|
#
|
|
c <- next-char fs
|
|
# if (c != '#') break
|
|
compare c, 0x23 # '#'
|
|
break-if-!=
|
|
#
|
|
header-level <- increment
|
|
#
|
|
loop
|
|
}
|
|
start-heading header-level
|
|
{
|
|
# if done-drawing?(state) break
|
|
{
|
|
var done?/eax: boolean <- done-drawing? state
|
|
compare done?, 0 # false
|
|
break-if-!=
|
|
}
|
|
#
|
|
c <- next-char fs
|
|
# if (c == EOF) break
|
|
compare c, 0xffffffff # EOF marker
|
|
break-if-=
|
|
# if (c == newline) break
|
|
compare c, 0xa # newline
|
|
break-if-=
|
|
#
|
|
add-char state, c
|
|
#
|
|
loop
|
|
}
|
|
normal-text
|
|
}
|
|
}
|
|
|
|
# colors for a light background, going from bright to dark (meeting up with bold-text)
|
|
fn start-heading header-level: int {
|
|
$start-heading:body: {
|
|
start-bold 0
|
|
compare header-level, 1
|
|
{
|
|
break-if-!=
|
|
start-color 0, 0xa0, 7
|
|
break $start-heading:body
|
|
}
|
|
compare header-level, 2
|
|
{
|
|
break-if-!=
|
|
start-color 0, 0x7c, 7
|
|
break $start-heading:body
|
|
}
|
|
compare header-level, 3
|
|
{
|
|
break-if-!=
|
|
start-color 0, 0x58, 7
|
|
break $start-heading:body
|
|
}
|
|
compare header-level, 4
|
|
{
|
|
break-if-!=
|
|
start-color 0, 0x34, 7
|
|
break $start-heading:body
|
|
}
|
|
start-color 0, 0xe8, 7
|
|
}
|
|
}
|
|
|
|
fn render-until-asterisk fs: (addr file-state), state: (addr screen-position-state) {
|
|
{
|
|
# if done-drawing?(state) break
|
|
var done?/eax: boolean <- done-drawing? state
|
|
compare done?, 0 # false
|
|
break-if-!=
|
|
#
|
|
var c/eax: byte <- next-char fs
|
|
# if (c == EOF) break
|
|
compare c, 0xffffffff # EOF marker
|
|
break-if-=
|
|
# if (c == '*') break
|
|
compare c, 0x2a # '*'
|
|
break-if-=
|
|
#
|
|
add-char state, c
|
|
#
|
|
loop
|
|
}
|
|
}
|
|
|
|
fn render-until-underscore fs: (addr file-state), state: (addr screen-position-state) {
|
|
{
|
|
# if done-drawing?(state) break
|
|
var done?/eax: boolean <- done-drawing? state
|
|
compare done?, 0 # false
|
|
break-if-!=
|
|
#
|
|
var c/eax: byte <- next-char fs
|
|
# if (c == EOF) break
|
|
compare c, 0xffffffff # EOF marker
|
|
break-if-=
|
|
# if (c == '_') break
|
|
compare c, 0x5f # '_'
|
|
break-if-=
|
|
#
|
|
add-char state, c
|
|
#
|
|
loop
|
|
}
|
|
}
|
|
|
|
fn first-arg args-on-stack: (addr array addr array byte) -> out/eax: (addr array byte) {
|
|
var args/eax: (addr array addr array byte) <- copy args-on-stack
|
|
var result/eax: (addr addr array byte) <- index args, 1
|
|
out <- copy *result
|
|
}
|
|
|
|
fn normal-text {
|
|
reset-formatting 0
|
|
start-color 0, 0xec, 7 # 236 = darkish gray
|
|
}
|