139 lines
5.0 KiB
Forth
139 lines
5.0 KiB
Forth
# Temperature Converter app
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# https://eugenkiss.github.io/7guis/tasks/#temp
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#
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# To build:
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# $ ./translate converter.mu
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# To run:
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# $ qemu-system-i386 code.img
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# todo:
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# less duplication
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# error checking for input without hard-aborting
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fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk) {
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# celsius numeric representation
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var zero: float
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var celsius/xmm1: float <- fahrenheit-to-celsius zero
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# celsius string representation
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var s-storage: (stream byte 0x10)
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var s/ecx: (addr stream byte) <- address s-storage
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write-float-decimal-approximate s, celsius, 2/decimal-places
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# celsius input/display
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var celsius-input-storage: gap-buffer
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var celsius-input/esi: (addr gap-buffer) <- address celsius-input-storage
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initialize-gap-buffer celsius-input, 8/capacity
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load-gap-buffer-from-stream celsius-input, s
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var cursor-in-celsius?/edx: boolean <- copy 0xffffffff/true
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# fahrenheit numeric representation
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var fahrenheit/xmm2: float <- celsius-to-fahrenheit celsius
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# fahrenheit string representation
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clear-stream s
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write-float-decimal-approximate s, fahrenheit, 2/decimal-places
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# fahrenheit input/display
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var fahrenheit-input-storage: gap-buffer
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var fahrenheit-input/edi: (addr gap-buffer) <- address fahrenheit-input-storage
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initialize-gap-buffer fahrenheit-input, 8/capacity
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load-gap-buffer-from-stream fahrenheit-input, s
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var cursor-in-fahrenheit?/ebx: boolean <- copy 0/false # exactly one cursor boolean must be true at any time
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# widget title
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set-cursor-position screen, 0x1f/x 0xe/y
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draw-text-rightward-from-cursor-over-full-screen screen, " Converter ", 0xf/fg 0x16/bg
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# event loop
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{
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# draw current state to screen
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clear-rect screen, 0x1f/xmin 0xf/ymin, 0x45/xmax 0x14/ymax, 0xc5/color
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var x/eax: int <- render-gap-buffer screen, celsius-input, 0x20/x 0x10/y, cursor-in-celsius?, 7/fg 0/bg
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x <- draw-text-rightward screen, " celsius = ", x, 0x45/xmax, 0x10/y, 7/fg 0xc5/bg
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x <- render-gap-buffer screen, fahrenheit-input, x 0x10/y, cursor-in-fahrenheit?, 7/fg 0/bg
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x <- draw-text-rightward screen, " fahrenheit", x, 0x45/xmax, 0x10/y, 7/fg 0xc5/bg
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# render a menu bar
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set-cursor-position screen, 0x21/x 0x12/y
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draw-text-rightward-from-cursor-over-full-screen screen, " tab ", 0/fg 0x5c/bg=highlight
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draw-text-rightward-from-cursor-over-full-screen screen, " switch sides ", 7/fg 0xc5/bg
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draw-text-rightward-from-cursor-over-full-screen screen, " enter ", 0/fg 0x5c/bg=highlight
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draw-text-rightward-from-cursor-over-full-screen screen, " convert ", 7/fg 0xc5/bg
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# process a single keystroke
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$main:input: {
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var key/eax: byte <- read-key keyboard
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var key/eax: grapheme <- copy key
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compare key, 0
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loop-if-=
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# tab = switch cursor between input areas
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compare key, 9/tab
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{
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break-if-!=
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cursor-in-celsius? <- not
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cursor-in-fahrenheit? <- not
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break $main:input
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}
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# enter = convert in appropriate direction
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compare key, 0xa/newline
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{
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break-if-!=
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{
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compare cursor-in-celsius?, 0/false
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break-if-=
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clear-stream s
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emit-gap-buffer celsius-input, s
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celsius <- parse-float-decimal s
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fahrenheit <- celsius-to-fahrenheit celsius
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clear-stream s
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write-float-decimal-approximate s, fahrenheit, 2/decimal-places
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clear-gap-buffer fahrenheit-input
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load-gap-buffer-from-stream fahrenheit-input, s
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}
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{
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compare cursor-in-fahrenheit?, 0/false
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break-if-=
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clear-stream s
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emit-gap-buffer fahrenheit-input, s
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{
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var tmp/xmm1: float <- parse-float-decimal s
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fahrenheit <- copy tmp
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}
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celsius <- fahrenheit-to-celsius fahrenheit
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clear-stream s
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write-float-decimal-approximate s, celsius, 2/decimal-places
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clear-gap-buffer celsius-input
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load-gap-buffer-from-stream celsius-input, s
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}
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break $main:input
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}
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# otherwise pass key to appropriate input area
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compare cursor-in-celsius?, 0/false
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{
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break-if-=
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edit-gap-buffer celsius-input, key
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break $main:input
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}
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compare cursor-in-fahrenheit?, 0/false
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{
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break-if-=
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edit-gap-buffer fahrenheit-input, key
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break $main:input
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}
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}
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loop
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}
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}
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fn fahrenheit-to-celsius f: float -> _/xmm1: float {
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var result/xmm1: float <- copy f
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var thirty-two/eax: int <- copy 0x20
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var thirty-two-f/xmm0: float <- convert thirty-two
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result <- subtract thirty-two-f
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var factor/xmm0: float <- rational 5, 9
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result <- multiply factor
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return result
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}
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fn celsius-to-fahrenheit c: float -> _/xmm2: float {
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var result/xmm1: float <- copy c
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var factor/xmm0: float <- rational 9, 5
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result <- multiply factor
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var thirty-two/eax: int <- copy 0x20
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var thirty-two-f/xmm0: float <- convert thirty-two
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result <- add thirty-two-f
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return result
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}
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