915 lines
24 KiB
Forth
915 lines
24 KiB
Forth
# Wrappers around print primitives that take a 'screen' object and are thus
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# easier to test.
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#
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# Screen objects are intended to exactly mimic the behavior of traditional
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# terminals. Moving a cursor too far right wraps it to the next line,
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# scrolling if necessary. The details are subtle:
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#
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# a) Rows can take unbounded values. When printing, large values for the row
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# saturate to the bottom row (because scrolling).
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#
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# b) If you print to a square (row, right) on the right margin, the cursor
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# position depends on whether 'row' is in range. If it is, the new cursor
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# position is (row+1, 0). If it isn't, the new cursor position is (row, 0).
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# Because scrolling.
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container screen [
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num-rows:num
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num-columns:num
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cursor-row:num
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cursor-column:num
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data:&:@:screen-cell # capacity num-rows*num-columns
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pending-scroll?:bool
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top-idx:num # index inside data that corresponds to top-left of screen
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# modified on scroll, wrapping around to the top of data
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]
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container screen-cell [
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contents:char
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color:num
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]
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def new-fake-screen w:num, h:num -> result:&:screen [
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local-scope
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load-inputs
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result <- new screen:type
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non-zero-width?:bool <- greater-than w, 0
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assert non-zero-width?, [screen can't have zero width]
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non-zero-height?:bool <- greater-than h, 0
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assert non-zero-height?, [screen can't have zero height]
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bufsize:num <- multiply w, h
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data:&:@:screen-cell <- new screen-cell:type, bufsize
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*result <- merge h/num-rows, w/num-columns, 0/cursor-row, 0/cursor-column, data, false/pending-scroll?, 0/top-idx
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result <- clear-screen result
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]
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def clear-screen screen:&:screen -> screen:&:screen [
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local-scope
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load-inputs
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#? stash [clear-screen]
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{
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break-if screen
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# real screen
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clear-display
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return
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}
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# fake screen
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buf:&:@:screen-cell <- get *screen, data:offset
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max:num <- length *buf
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i:num <- copy 0
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{
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done?:bool <- greater-or-equal i, max
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break-if done?
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curr:screen-cell <- merge 0/empty, 7/white
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*buf <- put-index *buf, i, curr
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i <- add i, 1
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loop
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}
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# reset cursor
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*screen <- put *screen, cursor-row:offset, 0
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*screen <- put *screen, cursor-column:offset, 0
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*screen <- put *screen, top-idx:offset, 0
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]
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def fake-screen-is-empty? screen:&:screen -> result:bool [
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local-scope
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load-inputs
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#? stash [fake-screen-is-empty?]
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return-unless screen, true # do nothing for real screens
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buf:&:@:screen-cell <- get *screen, data:offset
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i:num <- copy 0
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len:num <- length *buf
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{
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done?:bool <- greater-or-equal i, len
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break-if done?
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curr:screen-cell <- index *buf, i
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curr-contents:char <- get curr, contents:offset
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i <- add i, 1
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loop-unless curr-contents
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# not 0
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return false
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}
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return true
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]
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def print screen:&:screen, c:char -> screen:&:screen [
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local-scope
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load-inputs
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color:num, color-found?:bool <- next-input
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{
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# default color to white
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break-if color-found?
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color <- copy 7/white
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}
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bg-color:num, bg-color-found?:bool <- next-input
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{
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# default bg-color to black
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break-if bg-color-found?
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bg-color <- copy 0/black
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}
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c2:num <- character-to-code c
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trace 90, [print-character], c2
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{
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# real screen
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break-if screen
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print-character-to-display c, color, bg-color
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return
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}
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# fake screen
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# (handle special cases exactly like in the real screen)
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width:num <- get *screen, num-columns:offset
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height:num <- get *screen, num-rows:offset
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capacity:num <- multiply width, height
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row:num <- get *screen, cursor-row:offset
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column:num <- get *screen, cursor-column:offset
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buf:&:@:screen-cell <- get *screen, data:offset
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# some potentially slow sanity checks for preconditions {
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# eliminate fractions from column and row
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row <- round row
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column <- round column
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# if cursor is past left margin (error), reset to left margin
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{
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too-far-left?:bool <- lesser-than column, 0
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break-unless too-far-left?
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column <- copy 0
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*screen <- put *screen, cursor-column:offset, column
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}
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# if cursor is at or past right margin, wrap
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{
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at-right?:bool <- greater-or-equal column, width
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break-unless at-right?
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column <- copy 0
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*screen <- put *screen, cursor-column:offset, column
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row <- add row, 1
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*screen <- put *screen, cursor-row:offset, row
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}
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# }
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# if there's a pending scroll, perform it
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{
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pending-scroll?:bool <- get *screen, pending-scroll?:offset
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break-unless pending-scroll?
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#? stash [scroll]
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scroll-fake-screen screen
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*screen <- put *screen, pending-scroll?:offset, false
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}
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#? $print [print-character (], row, [, ], column, [): ], c, 10/newline
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# special-case: newline
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{
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newline?:bool <- equal c, 10/newline
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break-unless newline?
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cursor-down-on-fake-screen screen # doesn't modify column
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return
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}
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# special-case: linefeed
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{
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linefeed?:bool <- equal c, 13/linefeed
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break-unless linefeed?
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*screen <- put *screen, cursor-column:offset, 0
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return
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}
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# special-case: backspace
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# moves cursor left but does not erase
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{
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backspace?:bool <- equal c, 8/backspace
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break-unless backspace?
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{
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break-unless column
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column <- subtract column, 1
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*screen <- put *screen, cursor-column:offset, column
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}
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return
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}
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# save character in fake screen
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top-idx:num <- get *screen, top-idx:offset
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index:num <- data-index row, column, width, height, top-idx
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cursor:screen-cell <- merge c, color
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*buf <- put-index *buf, index, cursor
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# move cursor to next character, wrapping as necessary
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# however, don't scroll just yet
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column <- add column, 1
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{
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past-right?:bool <- greater-or-equal column, width
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break-unless past-right?
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column <- copy 0
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row <- add row, 1
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past-bottom?:bool <- greater-or-equal row, height
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break-unless past-bottom?
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# queue up a scroll
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#? stash [pending scroll]
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*screen <- put *screen, pending-scroll?:offset, true
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row <- subtract row, 1 # update cursor as if scroll already happened
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}
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*screen <- put *screen, cursor-row:offset, row
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*screen <- put *screen, cursor-column:offset, column
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]
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def cursor-down-on-fake-screen screen:&:screen -> screen:&:screen [
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local-scope
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load-inputs
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#? stash [cursor-down]
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row:num <- get *screen, cursor-row:offset
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height:num <- get *screen, num-rows:offset
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bottom:num <- subtract height, 1
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at-bottom?:bool <- greater-or-equal row, bottom
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{
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break-if at-bottom?
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row <- add row, 1
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*screen <- put *screen, cursor-row:offset, row
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}
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{
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break-unless at-bottom?
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scroll-fake-screen screen # does not modify row
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}
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]
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def scroll-fake-screen screen:&:screen -> screen:&:screen [
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local-scope
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load-inputs
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#? stash [scroll-fake-screen]
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width:num <- get *screen, num-columns:offset
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height:num <- get *screen, num-rows:offset
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buf:&:@:screen-cell <- get *screen, data:offset
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# clear top line and 'rotate' it to the bottom
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top-idx:num <- get *screen, top-idx:offset # 0 <= top-idx < len(buf)
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next-top-idx:num <- add top-idx, width # 0 <= next-top-idx <= len(buf)
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empty-cell:screen-cell <- merge 0/empty, 7/white
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{
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done?:bool <- greater-or-equal top-idx, next-top-idx
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break-if done?
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put-index *buf, top-idx, empty-cell
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top-idx <- add top-idx, 1
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# no modulo; top-idx is always a multiple of width,
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# so it can never wrap around inside this loop
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loop
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}
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# top-idx now same as next-top-idx; wrap around if necessary
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capacity:num <- multiply width, height
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_, top-idx <- divide-with-remainder, top-idx, capacity
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*screen <- put *screen, top-idx:offset, top-idx
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]
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# translate from screen (row, column) coordinates to an index into data
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# while accounting for scrolling (sliding top-idx)
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def data-index row:num, column:num, width:num, height:num, top-idx:num -> result:num [
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local-scope
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load-inputs
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{
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overflow?:bool <- greater-or-equal row, height
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break-unless overflow?
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row <- subtract height, 1
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}
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result <- multiply width, row
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result <- add result, column, top-idx
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capacity:num <- multiply width, height
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_, result <- divide-with-remainder result, capacity
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]
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scenario print-character-at-top-left [
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local-scope
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fake-screen:&:screen <- new-fake-screen 3/width, 2/height
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run [
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a:char <- copy 97/a
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fake-screen <- print fake-screen, a:char
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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1:@:screen-cell/raw <- copy *cell
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]
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memory-should-contain [
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1 <- 6 # width*height
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2 <- 97 # 'a'
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3 <- 7 # white
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# rest of screen is empty
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4 <- 0
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]
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]
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scenario print-character-at-fractional-coordinate [
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local-scope
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fake-screen:&:screen <- new-fake-screen 3/width, 2/height
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a:char <- copy 97/a
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run [
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move-cursor fake-screen, 0.5, 0
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fake-screen <- print fake-screen, a:char
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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1:@:screen-cell/raw <- copy *cell
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]
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memory-should-contain [
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1 <- 6 # width*height
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2 <- 97 # 'a'
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3 <- 7 # white
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# rest of screen is empty
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4 <- 0
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]
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]
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scenario print-character-in-color [
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local-scope
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fake-screen:&:screen <- new-fake-screen 3/width, 2/height
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run [
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a:char <- copy 97/a
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fake-screen <- print fake-screen, a:char, 1/red
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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1:@:screen-cell/raw <- copy *cell
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]
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memory-should-contain [
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1 <- 6 # width*height
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2 <- 97 # 'a'
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3 <- 1 # red
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# rest of screen is empty
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4 <- 0
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]
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]
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scenario print-backspace-character [
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local-scope
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fake-screen:&:screen <- new-fake-screen 3/width, 2/height
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a:char <- copy 97/a
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fake-screen <- print fake-screen, a
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run [
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backspace:char <- copy 8/backspace
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fake-screen <- print fake-screen, backspace
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10:num/raw <- get *fake-screen, cursor-column:offset
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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11:@:screen-cell/raw <- copy *cell
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]
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memory-should-contain [
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10 <- 0 # cursor column
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11 <- 6 # width*height
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12 <- 97 # still 'a'
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13 <- 7 # white
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# rest of screen is empty
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14 <- 0
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]
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]
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scenario print-extra-backspace-character [
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local-scope
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fake-screen:&:screen <- new-fake-screen 3/width, 2/height
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a:char <- copy 97/a
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fake-screen <- print fake-screen, a
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run [
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backspace:char <- copy 8/backspace
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fake-screen <- print fake-screen, backspace
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fake-screen <- print fake-screen, backspace # cursor already at left margin
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1:num/raw <- get *fake-screen, cursor-column:offset
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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3:@:screen-cell/raw <- copy *cell
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]
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memory-should-contain [
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1 <- 0 # cursor column
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3 <- 6 # width*height
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4 <- 97 # still 'a'
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5 <- 7 # white
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# rest of screen is empty
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6 <- 0
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]
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]
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scenario print-character-at-right-margin [
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# fill top row of screen with text
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local-scope
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fake-screen:&:screen <- new-fake-screen 2/width, 2/height
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a:char <- copy 97/a
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fake-screen <- print fake-screen, a
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b:char <- copy 98/b
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fake-screen <- print fake-screen, b
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run [
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# cursor now at next row
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c:char <- copy 99/c
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fake-screen <- print fake-screen, c
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10:num/raw <- get *fake-screen, cursor-row:offset
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11:num/raw <- get *fake-screen, cursor-column:offset
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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12:@:screen-cell/raw <- copy *cell
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]
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memory-should-contain [
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10 <- 1 # cursor row
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11 <- 1 # cursor column
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12 <- 4 # width*height
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13 <- 97 # 'a'
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14 <- 7 # white
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15 <- 98 # 'b'
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16 <- 7 # white
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17 <- 99 # 'c'
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18 <- 7 # white
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19 <- 0 # ' '
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20 <- 7 # white
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]
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]
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scenario print-newline-character [
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local-scope
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fake-screen:&:screen <- new-fake-screen 3/width, 2/height
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a:char <- copy 97/a
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fake-screen <- print fake-screen, a
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run [
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newline:char <- copy 10/newline
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fake-screen <- print fake-screen, newline
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10:num/raw <- get *fake-screen, cursor-row:offset
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11:num/raw <- get *fake-screen, cursor-column:offset
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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12:@:screen-cell/raw <- copy *cell
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]
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memory-should-contain [
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10 <- 1 # cursor row
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11 <- 1 # cursor column
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12 <- 6 # width*height
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13 <- 97 # 'a'
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14 <- 7 # white
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# rest of screen is empty
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15 <- 0
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]
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]
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scenario print-newline-at-bottom-line [
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local-scope
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fake-screen:&:screen <- new-fake-screen 3/width, 2/height
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newline:char <- copy 10/newline
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fake-screen <- print fake-screen, newline
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fake-screen <- print fake-screen, newline
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run [
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# cursor now at bottom of screen
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fake-screen <- print fake-screen, newline
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10:num/raw <- get *fake-screen, cursor-row:offset
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11:num/raw <- get *fake-screen, cursor-column:offset
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]
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# doesn't move further down
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memory-should-contain [
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10 <- 1 # cursor row
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11 <- 0 # cursor column
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]
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]
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scenario print-character-at-bottom-right [
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local-scope
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fake-screen:&:screen <- new-fake-screen 2/width, 2/height
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a:char <- copy 97/a
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fake-screen <- print fake-screen, a
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b:char <- copy 98/b
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fake-screen <- print fake-screen, b
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c:char <- copy 99/c
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fake-screen <- print fake-screen, c
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run [
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# cursor now at bottom right
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d:char <- copy 100/d
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fake-screen <- print fake-screen, d
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10:num/raw <- get *fake-screen, cursor-row:offset
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11:num/raw <- get *fake-screen, cursor-column:offset
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12:num/raw <- get *fake-screen, top-idx:offset
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13:bool/raw <- get *fake-screen, pending-scroll?:offset
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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20:@:screen-cell/raw <- copy *cell
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]
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# cursor column wraps but the screen doesn't scroll yet
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memory-should-contain [
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10 <- 1 # cursor row
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11 <- 0 # cursor column -- outside screen
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12 <- 0 # top-idx -- not yet scrolled
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13 <- 1 # pending-scroll?
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20 <- 4 # screen size (width*height)
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21 <- 97 # 'a'
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22 <- 7 # white
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23 <- 98 # 'b'
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24 <- 7 # white
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25 <- 99 # 'c'
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26 <- 7 # white
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27 <- 100 # 'd'
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28 <- 7 # white
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]
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run [
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e:char <- copy 101/e
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print fake-screen, e
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10:num/raw <- get *fake-screen, cursor-row:offset
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11:num/raw <- get *fake-screen, cursor-column:offset
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12:num/raw <- get *fake-screen, top-idx:offset
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cell:&:@:screen-cell <- get *fake-screen, data:offset
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20:@:screen-cell/raw <- copy *cell
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]
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memory-should-contain [
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# text scrolls by 1, we lose the top line
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10 <- 1 # cursor row
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11 <- 1 # cursor column -- wrapped
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12 <- 2 # top-idx -- scrolled
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20 <- 4 # screen size (width*height)
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# screen now checked in rotated order
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25 <- 99 # 'c'
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26 <- 7 # white
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27 <- 100 # 'd'
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28 <- 7 # white
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# screen wraps; bottom line is cleared of old contents
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21 <- 101 # 'e'
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22 <- 7 # white
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23 <- 0 # unused
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24 <- 7 # white
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]
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]
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# even though our screen supports scrolling, some apps may want to avoid
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# scrolling
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# these helpers help check for scrolling at development time
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def save-top-idx screen:&:screen -> result:num [
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local-scope
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load-inputs
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return-unless screen, 0 # check is only for fake screens
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result <- get *screen, top-idx:offset
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]
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def assert-no-scroll screen:&:screen, old-top-idx:num [
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local-scope
|
|
load-inputs
|
|
return-unless screen
|
|
new-top-idx:num <- get *screen, top-idx:offset
|
|
no-scroll?:bool <- equal old-top-idx, new-top-idx
|
|
assert no-scroll?, [render should never use screen's scrolling capabilities]
|
|
]
|
|
|
|
def clear-line screen:&:screen -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [clear-line]
|
|
space:char <- copy 0/nul
|
|
{
|
|
break-if screen
|
|
# real screen
|
|
clear-line-on-display
|
|
return
|
|
}
|
|
# fake screen
|
|
width:num <- get *screen, num-columns:offset
|
|
column:num <- get *screen, cursor-column:offset
|
|
original-column:num <- copy column
|
|
# space over the entire line
|
|
{
|
|
right:num <- subtract width, 1
|
|
done?:bool <- greater-or-equal column, right
|
|
break-if done?
|
|
print screen, space
|
|
column <- add column, 1
|
|
loop
|
|
}
|
|
# now back to where the cursor was
|
|
*screen <- put *screen, cursor-column:offset, original-column
|
|
]
|
|
|
|
# only for non-scrolling apps
|
|
def clear-line-until screen:&:screen, right:num/inclusive -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
row:num, column:num <- cursor-position screen
|
|
#? stash [clear-line-until] row column
|
|
height:num <- screen-height screen
|
|
past-bottom?:bool <- greater-or-equal row, height
|
|
return-if past-bottom?
|
|
space:char <- copy 32/space
|
|
bg-color:num, bg-color-found?:bool <- next-input
|
|
{
|
|
# default bg-color to black
|
|
break-if bg-color-found?
|
|
bg-color <- copy 0/black
|
|
}
|
|
{
|
|
done?:bool <- greater-than column, right
|
|
break-if done?
|
|
screen <- print screen, space, 7/white, bg-color # foreground color is mostly unused except if the cursor shows up at this cell
|
|
column <- add column, 1
|
|
loop
|
|
}
|
|
]
|
|
|
|
def cursor-position screen:&:screen -> row:num, column:num [
|
|
local-scope
|
|
load-inputs
|
|
{
|
|
break-if screen
|
|
# real screen
|
|
row, column <- cursor-position-on-display
|
|
return
|
|
}
|
|
# fake screen
|
|
row:num <- get *screen, cursor-row:offset
|
|
column:num <- get *screen, cursor-column:offset
|
|
]
|
|
|
|
def move-cursor screen:&:screen, new-row:num, new-column:num -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [move-cursor] new-row new-column
|
|
{
|
|
break-if screen
|
|
# real screen
|
|
move-cursor-on-display new-row, new-column
|
|
return
|
|
}
|
|
# fake screen
|
|
*screen <- put *screen, cursor-row:offset, new-row
|
|
*screen <- put *screen, cursor-column:offset, new-column
|
|
# if cursor column is within bounds, reset 'pending-scroll?'
|
|
{
|
|
width:num <- get *screen, num-columns:offset
|
|
scroll?:bool <- greater-or-equal new-column, width
|
|
break-if scroll?
|
|
#? stash [resetting pending-scroll?]
|
|
*screen <- put *screen, pending-scroll?:offset, false
|
|
}
|
|
]
|
|
|
|
scenario clear-line-erases-printed-characters [
|
|
local-scope
|
|
fake-screen:&:screen <- new-fake-screen 3/width, 2/height
|
|
# print a character
|
|
a:char <- copy 97/a
|
|
fake-screen <- print fake-screen, a
|
|
# move cursor to start of line
|
|
fake-screen <- move-cursor fake-screen, 0/row, 0/column
|
|
run [
|
|
fake-screen <- clear-line fake-screen
|
|
cell:&:@:screen-cell <- get *fake-screen, data:offset
|
|
10:@:screen-cell/raw <- copy *cell
|
|
]
|
|
# screen should be blank
|
|
memory-should-contain [
|
|
10 <- 6 # width*height
|
|
11 <- 0
|
|
12 <- 7
|
|
13 <- 0
|
|
14 <- 7
|
|
15 <- 0
|
|
16 <- 7
|
|
17 <- 0
|
|
18 <- 7
|
|
19 <- 0
|
|
20 <- 7
|
|
21 <- 0
|
|
22 <- 7
|
|
]
|
|
]
|
|
|
|
def cursor-down screen:&:screen -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [cursor-down]
|
|
{
|
|
break-if screen
|
|
# real screen
|
|
move-cursor-down-on-display
|
|
return
|
|
}
|
|
# fake screen
|
|
cursor-down-on-fake-screen screen
|
|
]
|
|
|
|
scenario cursor-down-scrolls [
|
|
local-scope
|
|
fake-screen:&:screen <- new-fake-screen 3/width, 2/height
|
|
# print something to screen and scroll
|
|
run [
|
|
print fake-screen, [abc]
|
|
cursor-to-next-line fake-screen
|
|
cursor-to-next-line fake-screen
|
|
data:&:@:screen-cell <- get *fake-screen, data:offset
|
|
10:@:screen-cell/raw <- copy *data
|
|
]
|
|
# screen is now blank
|
|
memory-should-contain [
|
|
10 <- 6 # width*height
|
|
11 <- 0
|
|
12 <- 7 # white
|
|
13 <- 0
|
|
14 <- 7 # white
|
|
15 <- 0
|
|
16 <- 7 # white
|
|
17 <- 0
|
|
18 <- 7 # white
|
|
19 <- 0
|
|
20 <- 7 # white
|
|
21 <- 0
|
|
22 <- 7 # white
|
|
]
|
|
]
|
|
|
|
def cursor-up screen:&:screen -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [cursor-up]
|
|
{
|
|
break-if screen
|
|
# real screen
|
|
move-cursor-up-on-display
|
|
return
|
|
}
|
|
# fake screen
|
|
row:num <- get *screen, cursor-row:offset
|
|
at-top?:bool <- lesser-or-equal row, 0
|
|
return-if at-top?
|
|
row <- subtract row, 1
|
|
*screen <- put *screen, cursor-row:offset, row
|
|
]
|
|
|
|
def cursor-right screen:&:screen -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [cursor-right]
|
|
{
|
|
break-if screen
|
|
# real screen
|
|
move-cursor-right-on-display
|
|
return
|
|
}
|
|
# fake screen
|
|
width:num <- get *screen, num-columns:offset
|
|
column:num <- get *screen, cursor-column:offset
|
|
max:num <- subtract width, 1
|
|
at-bottom?:bool <- greater-or-equal column, max
|
|
return-if at-bottom?
|
|
column <- add column, 1
|
|
*screen <- put *screen, cursor-column:offset, column
|
|
]
|
|
|
|
def cursor-left screen:&:screen -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [cursor-left]
|
|
{
|
|
break-if screen
|
|
# real screen
|
|
move-cursor-left-on-display
|
|
return
|
|
}
|
|
# fake screen
|
|
column:num <- get *screen, cursor-column:offset
|
|
at-top?:bool <- lesser-or-equal column, 0
|
|
return-if at-top?
|
|
column <- subtract column, 1
|
|
*screen <- put *screen, cursor-column:offset, column
|
|
]
|
|
|
|
def cursor-to-start-of-line screen:&:screen -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [cursor-to-start-of-line]
|
|
row:num <- cursor-position screen
|
|
screen <- move-cursor screen, row, 0/column
|
|
]
|
|
|
|
def cursor-to-next-line screen:&:screen -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [cursor-to-next-line]
|
|
screen <- cursor-down screen
|
|
screen <- cursor-to-start-of-line screen
|
|
]
|
|
|
|
def move-cursor-to-column screen:&:screen, column:num -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
row:num, _ <- cursor-position screen
|
|
#? stash [move-cursor-to-column] row
|
|
move-cursor screen, row, column
|
|
]
|
|
|
|
def screen-width screen:&:screen -> width:num [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [screen-width]
|
|
{
|
|
break-unless screen
|
|
# fake screen
|
|
width <- get *screen, num-columns:offset
|
|
return
|
|
}
|
|
# real screen
|
|
width <- display-width
|
|
]
|
|
|
|
def screen-height screen:&:screen -> height:num [
|
|
local-scope
|
|
load-inputs
|
|
#? stash [screen-height]
|
|
{
|
|
break-unless screen
|
|
# fake screen
|
|
height <- get *screen, num-rows:offset
|
|
return
|
|
}
|
|
# real screen
|
|
height <- display-height
|
|
]
|
|
|
|
def print screen:&:screen, s:text -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
color:num, color-found?:bool <- next-input
|
|
{
|
|
# default color to white
|
|
break-if color-found?
|
|
color <- copy 7/white
|
|
}
|
|
bg-color:num, bg-color-found?:bool <- next-input
|
|
{
|
|
# default bg-color to black
|
|
break-if bg-color-found?
|
|
bg-color <- copy 0/black
|
|
}
|
|
len:num <- length *s
|
|
i:num <- copy 0
|
|
{
|
|
done?:bool <- greater-or-equal i, len
|
|
break-if done?
|
|
c:char <- index *s, i
|
|
print screen, c, color, bg-color
|
|
i <- add i, 1
|
|
loop
|
|
}
|
|
]
|
|
|
|
scenario print-text-wraps-past-right-margin [
|
|
local-scope
|
|
fake-screen:&:screen <- new-fake-screen 3/width, 2/height
|
|
run [
|
|
fake-screen <- print fake-screen, [abcd]
|
|
5:num/raw <- get *fake-screen, cursor-row:offset
|
|
6:num/raw <- get *fake-screen, cursor-column:offset
|
|
7:num/raw <- get *fake-screen, top-idx:offset
|
|
cell:&:@:screen-cell <- get *fake-screen, data:offset
|
|
10:@:screen-cell/raw <- copy *cell
|
|
]
|
|
memory-should-contain [
|
|
5 <- 1 # cursor-row
|
|
6 <- 1 # cursor-column
|
|
7 <- 0 # top-idx
|
|
10 <- 6 # width*height
|
|
11 <- 97 # 'a'
|
|
12 <- 7 # white
|
|
13 <- 98 # 'b'
|
|
14 <- 7 # white
|
|
15 <- 99 # 'c'
|
|
16 <- 7 # white
|
|
17 <- 100 # 'd'
|
|
18 <- 7 # white
|
|
# rest of screen is empty
|
|
19 <- 0
|
|
]
|
|
]
|
|
|
|
def print screen:&:screen, n:num -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
color:num, color-found?:bool <- next-input
|
|
{
|
|
# default color to white
|
|
break-if color-found?
|
|
color <- copy 7/white
|
|
}
|
|
bg-color:num, bg-color-found?:bool <- next-input
|
|
{
|
|
# default bg-color to black
|
|
break-if bg-color-found?
|
|
bg-color <- copy 0/black
|
|
}
|
|
# todo: other bases besides decimal
|
|
s:text <- to-text n
|
|
screen <- print screen, s, color, bg-color
|
|
]
|
|
|
|
def print screen:&:screen, n:bool -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
color:num, color-found?:bool <- next-input
|
|
{
|
|
# default color to white
|
|
break-if color-found?
|
|
color <- copy 7/white
|
|
}
|
|
bg-color:num, bg-color-found?:bool <- next-input
|
|
{
|
|
# default bg-color to black
|
|
break-if bg-color-found?
|
|
bg-color <- copy 0/black
|
|
}
|
|
{
|
|
break-if n
|
|
screen <- print screen, [false], color, bg-color
|
|
}
|
|
{
|
|
break-unless n
|
|
screen <- print screen, [true], color, bg-color
|
|
}
|
|
]
|
|
|
|
def print screen:&:screen, n:&:_elem -> screen:&:screen [
|
|
local-scope
|
|
load-inputs
|
|
color:num, color-found?:bool <- next-input
|
|
{
|
|
# default color to white
|
|
break-if color-found?
|
|
color <- copy 7/white
|
|
}
|
|
bg-color:num, bg-color-found?:bool <- next-input
|
|
{
|
|
# default bg-color to black
|
|
break-if bg-color-found?
|
|
bg-color <- copy 0/black
|
|
}
|
|
n2:num <- deaddress n
|
|
screen <- print screen, n2, color, bg-color
|
|
]
|