161 lines
6.3 KiB
Forth
161 lines
6.3 KiB
Forth
# Experimental Mu shell
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# A Lisp with indent-sensitivity and infix.
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fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk) {
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var globals-storage: global-table
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var globals/edi: (addr global-table) <- address globals-storage
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initialize-globals globals
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var sandbox-storage: sandbox
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var sandbox/esi: (addr sandbox) <- address sandbox-storage
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initialize-sandbox sandbox, 1/with-screen
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load-state data-disk, sandbox, globals
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$main:loop: {
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# globals layout: 1 char padding, 41 code, 1 padding, 41 code, 1 padding = 85
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# sandbox layout: 1 padding, 41 code, 1 padding = 43
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# total = 128 chars
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render-globals screen, globals
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render-sandbox screen, sandbox, 0x55/sandbox-left-margin, 0/sandbox-top-margin, 0x80/screen-width, 0x2f/screen-height-without-menu
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{
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var key/eax: byte <- read-key keyboard
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compare key, 0
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loop-if-=
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# ctrl-r
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{
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compare key, 0x12/ctrl-r
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break-if-!=
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var tmp/eax: (addr handle cell) <- copy 0
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var nil: (handle cell)
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tmp <- address nil
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allocate-pair tmp
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# (main 0/real-screen 0/real-keyboard)
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# We're using the fact that 'screen' and 'keyboard' in this function are always 0.
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var real-keyboard: (handle cell)
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tmp <- address real-keyboard
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allocate-keyboard tmp
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# args = cons(real-keyboard, nil)
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var args: (handle cell)
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tmp <- address args
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new-pair tmp, real-keyboard, nil
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#
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var real-screen: (handle cell)
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tmp <- address real-screen
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allocate-screen tmp
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# args = cons(real-screen, args)
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tmp <- address args
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new-pair tmp, real-screen, *tmp
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#
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var main: (handle cell)
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tmp <- address main
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new-symbol tmp, "main"
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# args = cons(main, args)
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tmp <- address args
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new-pair tmp, main, *tmp
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# clear real screen
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clear-screen screen
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set-cursor-position screen, 0, 0
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# run
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var out: (handle cell)
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var out-ah/ecx: (addr handle cell) <- address out
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evaluate tmp, out-ah, nil, globals, 0/trace, 0/no-fake-screen, 0/no-fake-keyboard, 0/call-number
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{
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var tmp/eax: byte <- read-key keyboard
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compare tmp, 0
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loop-if-=
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}
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#
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loop $main:loop
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}
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# no way to quit right now; just reboot
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edit-sandbox sandbox, key, globals, data-disk, screen, 1/tweak-real-screen
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}
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loop
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}
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}
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# Gotcha: some saved state may not load.
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fn load-state data-disk: (addr disk), _sandbox: (addr sandbox), globals: (addr global-table) {
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var sandbox/eax: (addr sandbox) <- copy _sandbox
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var data-ah/eax: (addr handle gap-buffer) <- get sandbox, data
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var _data/eax: (addr gap-buffer) <- lookup *data-ah
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var data/esi: (addr gap-buffer) <- copy _data
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# data-disk -> stream
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var s-storage: (stream byte 0x1000) # space for 8/sectors
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var s/ebx: (addr stream byte) <- address s-storage
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "loading sectors from data disk", 3/fg, 0/bg
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move-cursor-to-left-margin-of-next-line 0/screen
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load-sectors data-disk, 0/lba, 8/sectors, s
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#? draw-stream-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, s, 7/fg, 0xc5/bg=blue-bg
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# stream -> gap-buffer
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "parsing", 3/fg, 0/bg
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move-cursor-to-left-margin-of-next-line 0/screen
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load-gap-buffer-from-stream data, s
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, " into gap buffer", 3/fg, 0/bg
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move-cursor-to-left-margin-of-next-line 0/screen
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clear-stream s
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# read: gap-buffer -> cell
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var initial-root-storage: (handle cell)
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var initial-root/ecx: (addr handle cell) <- address initial-root-storage
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read-cell data, initial-root, 0/no-trace
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, " into s-expressions", 3/fg, 0/bg
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move-cursor-to-left-margin-of-next-line 0/screen
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clear-gap-buffer data
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#
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{
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var initial-root-addr/eax: (addr cell) <- lookup *initial-root
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compare initial-root-addr, 0
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break-if-!=
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return
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}
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# load globals from assoc(initial-root, 'globals)
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var globals-literal-storage: (handle cell)
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var globals-literal-ah/eax: (addr handle cell) <- address globals-literal-storage
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new-symbol globals-literal-ah, "globals"
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var globals-literal/eax: (addr cell) <- lookup *globals-literal-ah
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var globals-cell-storage: (handle cell)
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var globals-cell-ah/edx: (addr handle cell) <- address globals-cell-storage
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lookup-symbol globals-literal, globals-cell-ah, *initial-root, 0/no-globals, 0/no-trace, 0/no-screen, 0/no-keyboard
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var globals-cell/eax: (addr cell) <- lookup *globals-cell-ah
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{
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compare globals-cell, 0
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break-if-=
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load-globals globals-cell-ah, globals
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}
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# sandbox = assoc(initial-root, 'sandbox)
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "loading sandbox", 3/fg, 0/bg
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var sandbox-literal-storage: (handle cell)
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var sandbox-literal-ah/eax: (addr handle cell) <- address sandbox-literal-storage
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new-symbol sandbox-literal-ah, "sandbox"
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var sandbox-literal/eax: (addr cell) <- lookup *sandbox-literal-ah
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var sandbox-cell-storage: (handle cell)
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var sandbox-cell-ah/edx: (addr handle cell) <- address sandbox-cell-storage
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lookup-symbol sandbox-literal, sandbox-cell-ah, *initial-root, 0/no-globals, 0/no-trace, 0/no-screen, 0/no-keyboard
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var sandbox-cell/eax: (addr cell) <- lookup *sandbox-cell-ah
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{
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compare sandbox-cell, 0
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break-if-=
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# print: cell -> stream
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print-cell sandbox-cell-ah, s, 0/no-trace
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# stream -> gap-buffer
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load-gap-buffer-from-stream data, s
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}
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}
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# Save state as an alist of alists:
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# ((globals . ((a . (fn ...))
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# ...))
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# (sandbox . ...))
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fn store-state data-disk: (addr disk), sandbox: (addr sandbox), globals: (addr global-table) {
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compare data-disk, 0/no-disk
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{
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break-if-!=
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return
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}
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var stream-storage: (stream byte 0x1000) # space enough for 8/sectors
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var stream/edi: (addr stream byte) <- address stream-storage
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write stream, "(\n"
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write-globals stream, globals
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write-sandbox stream, sandbox
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write stream, ")\n"
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store-sectors data-disk, 0/lba, 8/sectors, stream
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}
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