199 lines
5.7 KiB
Forth
199 lines
5.7 KiB
Forth
type channel {
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id: (handle array byte)
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name: (handle array byte)
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posts: (handle array int) # item indices
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newest-post-index: int
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}
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type user {
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id: (handle array byte)
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name: (handle array byte)
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real-name: (handle array byte)
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avatar: (handle image)
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}
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type item {
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id: (handle array byte)
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channel: (handle array byte)
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by: int # user index
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text: (handle array byte)
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parent: int # item index
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comments: (handle array int)
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}
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# globals:
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# users: (handle array user)
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# channels: (handle array channel)
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# items: (handle array item)
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#
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# flows:
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# channel -> posts
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# user -> posts|comments
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# post -> comments
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# comment -> post|comments
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# keywords -> posts|comments
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# I try to put all the static buffer sizes in this function.
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fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk) {
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# load entire disk contents to a single enormous stream
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var s-h: (handle stream byte) # the stream is too large to put on the stack
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var s-ah/eax: (addr handle stream byte) <- address s-h
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populate-stream s-ah, 0x4000000
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "loading data disk..", 3/fg 0/bg
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var _s/eax: (addr stream byte) <- lookup *s-ah
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var s/ebx: (addr stream byte) <- copy _s
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#? load-sectors data-disk, 0/lba, 0x20000/sectors, s
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#? load-sectors data-disk, 0/lba, 0x7000/sectors, s
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load-sectors data-disk, 0/lba, 0x10/sectors, s
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "done", 3/fg 0/bg
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# parse global data structures out of the stream
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var users-h: (handle array user)
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var users-ah/eax: (addr handle array user) <- address users-h
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populate users-ah, 0x800
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var _users/eax: (addr array user) <- lookup *users-ah
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var users/edi: (addr array user) <- copy _users
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var channels-h: (handle array channel)
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var channels-ah/eax: (addr handle array channel) <- address channels-h
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populate channels-ah, 0x20
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var _channels/eax: (addr array channel) <- lookup *channels-ah
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var channels/esi: (addr array channel) <- copy _channels
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var items-h: (handle array item)
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var items-ah/eax: (addr handle array item) <- address items-h
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populate items-ah, 0x10000
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var _items/eax: (addr array item) <- lookup *items-ah
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var items/edx: (addr array item) <- copy _items
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parse s, users, channels, items
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# render
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var env-storage: environment
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var env/ebx: (addr environment) <- address env-storage
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{
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render-environment env, users, channels, items
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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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update-environment env, key
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}
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loop
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}
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}
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fn parse in: (addr stream byte), users: (addr array user), channels: (addr array channel), items: (addr array item) {
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# 'in' consists of a long, flat sequence of records surrounded by parens
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var record-storage: (stream byte 0x18000)
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var record/ecx: (addr stream byte) <- address record-storage
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var user-idx/edx: int <- copy 0
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var item-idx/ebx: int <- copy 0
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{
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var done?/eax: boolean <- stream-empty? in
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compare done?, 0/false
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break-if-!=
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var c/eax: byte <- peek-byte in
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compare c, 0
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break-if-=
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set-cursor-position 0/screen, 0x20 0x20
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draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, user-idx, 3/fg 0/bg
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draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, item-idx, 4/fg 0/bg
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clear-stream record
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parse-record in, record
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var user?/eax: boolean <- user-record? record
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{
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compare user?, 0/false
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break-if-=
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parse-user record, users, user-idx
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user-idx <- increment
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}
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{
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compare user?, 0/false
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break-if-!=
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parse-item record, channels, items, item-idx
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item-idx <- increment
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}
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loop
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}
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}
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fn parse-record in: (addr stream byte), out: (addr stream byte) {
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var paren/eax: byte <- read-byte in
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compare paren, 0x28/open-paren
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{
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break-if-=
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set-cursor-position 0/screen, 0x20 0x10
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var c/eax: int <- copy paren
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draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen c, 5/fg 0/bg
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abort "parse-record: ("
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}
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var paren-int/eax: int <- copy paren
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append-byte out, paren-int
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{
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{
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var eof?/eax: boolean <- stream-empty? in
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compare eof?, 0/false
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break-if-=
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abort "parse-record: truncated"
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}
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var c/eax: byte <- read-byte in
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{
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var c-int/eax: int <- copy c
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append-byte out, c-int
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}
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compare c, 0x29/close-paren
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break-if-=
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compare c, 0x22/double-quote
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{
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break-if-!=
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slurp-json-string in, out
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}
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loop
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}
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skip-chars-matching-whitespace in
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}
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fn user-record? record: (addr stream byte) -> _/eax: boolean {
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rewind-stream record
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var c/eax: byte <- read-byte record # skip paren
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var c/eax: byte <- read-byte record # skip double quote
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var c/eax: byte <- read-byte record
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compare c, 0x55/U
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{
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break-if-!=
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return 1/true
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}
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rewind-stream record
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return 0/false
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}
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fn parse-user record: (addr stream byte), users: (addr array user), user-idx: int {
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}
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fn parse-item record: (addr stream byte), channels: (addr array channel), items: (addr array item), item-idx: int {
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}
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fn slurp-json-string in: (addr stream byte), out: (addr stream byte) {
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# open quote is already slurped
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{
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{
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var eof?/eax: boolean <- stream-empty? in
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compare eof?, 0/false
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break-if-=
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abort "slurp-json-string: truncated"
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}
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var c/eax: byte <- read-byte in
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{
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var c-int/eax: int <- copy c
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append-byte out, c-int
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}
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compare c, 0x22/double-quote
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break-if-=
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compare c, 0x5c/backslash
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{
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break-if-!=
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# read next byte raw
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c <- read-byte in
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var c-int/eax: int <- copy c
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append-byte out, c-int
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}
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loop
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}
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}
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