. - mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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author	Kartik K. Agaram <vc@akkartik.com>	2021-07-16 06:12:51 -0700
committer	Kartik K. Agaram <vc@akkartik.com>	2021-07-16 06:12:51 -0700
commit	cd9a3fe3ad0253c0c486f740c0ea2f52367a269b (patch)
tree	dcd26caf779a521d40e7a2da2279f7629ecd68b0 /html/rpn.mu.html
parent	055d8d78695e71b5d8833875b827d380b7be7861 (diff)
download	mu-cd9a3fe3ad0253c0c486f740c0ea2f52367a269b.tar.gz

Diffstat (limited to 'html/rpn.mu.html')

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## putting the environment together out of editors def! main [ local-scope open-console clear-screen null/screen # non-scrolling app env:&:environment <- new-programming-environment null/filesystem, null/screen render-all null/screen, env, render event-loop null/screen, null/console, env, null/filesystem ] container environment [ current-sandbox:&:editor ] def new-programming-environment resources:&:resources, screen:&:screen, test-sandbox-editor-contents:text -> result:&:environment [ local-scope load-inputs width:num <- screen-width screen result <- new environment:type # sandbox editor current-sandbox:&:editor <- new-editor test-sandbox-editor-contents, 0/left, width/right *result <- put *result, current-sandbox:offset, current-sandbox <programming-environment-initialization> ] def event-loop screen:&:screen, console:&:console, env:&:environment, resources:&:resources -> screen:&:screen, console:&:console, env:&:environment, resources:&:resources [ local-scope load-inputs current-sandbox:&:editor <- get *env, current-sandbox:offset # if we fall behind we'll stop updating the screen, but then we have to # render the entire screen when we catch up. # todo: test this render-all-on-no-more-events?:bool <- copy false { # looping over each (keyboard or touch) event as it occurs +next-event e:event, found?:bool, quit?:bool, console <- read-event console loop-unless found? break-if quit? # only in tests trace 10, [app], [next-event] <handle-event> # check for global events that will trigger regardless of which editor has focus { k:num, is-keycode?:bool <- maybe-convert e:event, keycode:variant break-unless is-keycode? <global-keypress> } { c:char, is-unicode?:bool <- maybe-convert e:event, text:variant break-unless is-unicode? <global-type> } # 'touch' event { t:touch-event, is-touch?:bool <- maybe-convert e:event, touch:variant break-unless is-touch? # ignore all but 'left-click' events for now # todo: test this touch-type:num <- get t, type:offset is-left-click?:bool <- equal touch-type, 65513/mouse-left loop-unless is-left-click?, +next-event click-row:num <- get t, row:offset click-column:num <- get t, column:offset # later exceptions for non-editor touches will go here <global-touch> move-cursor current-sandbox, screen, t screen <- update-cursor screen, current-sandbox, env loop +next-event } # 'resize' event - redraw editor # todo: test this after supporting resize in assume-console { r:resize-event, is-resize?:bool <- maybe-convert e:event, resize:variant break-unless is-resize? env, screen <- resize screen, env screen <- render-all screen, env, render-without-moving-cursor loop +next-event } # not global and not a touch event { render?:bool <- handle-keyboard-event screen, current-sandbox, e:event # try to batch up rendering if there are more events queued up render-all-on-no-more-events? <- or render-all-on-no-more-events?, render? more-events?:bool <- has-more-events? console { break-if more-events? break-unless render-all-on-no-more-events? render-all-on-no-more-events? <- copy false screen <- render-all screen, env, render } screen <- update-cursor screen, current-sandbox, env } loop } ] def resize screen:&:screen, env:&:environment -> env:&:environment, screen:&:screen [ local-scope load-inputs clear-screen screen # update screen dimensions width:num <- screen-width screen # update sandbox editor current-sandbox:&:editor <- get *env, current-sandbox:offset right:num <- subtract width, 1 *current-sandbox <- put *current-sandbox right:offset, right # reset cursor *current-sandbox <- put *current-sandbox, cursor-row:offset, 1 *current-sandbox <- put *current-sandbox, cursor-column:offset, 0 ] # Variant of 'render' that updates cursor-row and cursor-column based on # before-cursor (rather than the other way around). If before-cursor moves # off-screen, it resets cursor-row and cursor-column. def render-without-moving-cursor screen:&:screen, editor:&:editor -> last-row:num, last-column:num, screen:&:screen, editor:&:editor [ local-scope load-inputs return-unless editor, 1/top, 0/left left:num <- get *editor, left:offset screen-height:num <- screen-height screen right:num <- get *editor, right:offset curr:&:duplex-list:char <- get *editor, top-of-screen:offset prev:&:duplex-list:char <- copy curr # just in case curr becomes null and we can't compute prev curr <- next curr color:num <- copy 7/white row:num <- copy 1/top column:num <- copy left # save before-cursor old-before-cursor:&:duplex-list:char <- get *editor, before-cursor:offset # initialze cursor-row/cursor-column/before-cursor to the top of the screen # by default *editor <- put *editor, cursor-row:offset, row *editor <- put *editor, cursor-column:offset, column top-of-screen:&:duplex-list:char <- get *editor, top-of-screen:offset *editor <- put *editor, before-cursor:offset, top-of-screen screen <- move-cursor screen, row, column { +next-character break-unless curr off-screen?:bool <- greater-or-equal row, screen-height break-if off-screen? # if we find old-before-cursor still on the new resized screen, update # editor.cursor-row and editor.cursor-column based on # old-before-cursor { at-cursor?:bool <- equal old-before-cursor, prev break-unless at-cursor? *editor <- put *editor, cursor-row:offset, row *editor <- put *editor, cursor-column:offset, column *editor <- put *editor, before-cursor:offset, old-before-cursor } c:char <- get *curr, value:offset <character-c-received> { # newline? move to left rather than 0 newline?:bool <- equal c, 10/newline break-unless newline? # clear rest of line in this window clear-line-until screen, right # skip to next line row <- add row, 1 column <- copy left screen <- move-cursor screen, row, column curr <- next curr prev <- next prev loop +next-character } { # at right? wrap. even if there's only one more letter left; we need # room for clicking on the cursor after it. at-right?:bool <- equal column, right break-unless at-right? # print wrap icon wrap-icon:char <- copy 8617/loop-back-to-left print screen, wrap-icon, 245/grey column <- copy left row <- add row, 1 screen <- move-cursor screen, row, column # don't increment curr loop +next-character } print screen, c, color curr <- next curr prev <- next prev column <- add column, 1 loop } # save first character off-screen *editor <- put *editor, bottom-of-screen:offset, curr *editor <- put *editor, bottom:offset, row return row, column ] type render-recipe = (recipe (address screen) (address editor) -> number number (address screen) (address editor)) def render-all screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [ local-scope load-inputs trace 10, [app], [render all] # top menu trace 11, [app], [render top menu] width:num <- screen-width screen draw-horizontal screen, 0, 0/left, width, 32/space, 0/black, 238/grey button-start:num <- subtract width, 20 button-on-screen?:bool <- greater-or-equal button-start, 0 assert button-on-screen?, [screen too narrow for menu] screen <- move-cursor screen, 0/row, button-start print screen, [ run (F4) ], 255/white, 161/reddish # screen <- render-sandbox-side screen, env, render-editor <end-render-components> # no early returns permitted # current-sandbox:&:editor <- get *env, current-sandbox:offset screen <- update-cursor screen, current-sandbox, env ] # replaced in a later layer def render-sandbox-side screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [ local-scope load-inputs trace 11, [app], [render sandboxes] old-top-idx:num <- save-top-idx screen current-sandbox:&:editor <- get *env, current-sandbox:offset left:num <- get *current-sandbox, left:offset right:num <- get *current-sandbox, right:offset row:num, column:num, screen, current-sandbox <- call render-editor, screen, current-sandbox # draw solid line after code (you'll see why in later layers) draw-horizontal screen, row, left, right row <- add row, 1 clear-screen-from screen, row, left, left, right # assert-no-scroll screen, old-top-idx ] def update-cursor screen:&:screen, current-sandbox:&:editor, env:&:environment -> screen:&:screen [ local-scope load-inputs <update-cursor-special-cases> cursor-row:num <- get *current-sandbox, cursor-row:offset cursor-column:num <- get *current-sandbox, cursor-column:offset screen <- move-cursor screen, cursor-row, cursor-column ] scenario backspace-over-text [ local-scope trace-until 100/app # trace too long assume-screen 50/width, 15/height # recipes.mu is empty assume-resources [ ] # sandbox editor contains an instruction without storing outputs env:&:environment <- new-programming-environment resources, screen, [] render-all screen, env, render # run the code in the editors assume-console [ type [a] press backspace ] run [ event-loop screen, console, env, resources 10:num/raw <- get *screen, cursor-row:offset 11:num/raw <- get *screen, cursor-column:offset ] memory-should-contain [ 10 <- 1 11 <- 0 ] ]


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