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Diffstat (limited to 'edit/002-typing.mu')
| -rw-r--r-- | edit/002-typing.mu | 1012 |
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diff --git a/edit/002-typing.mu b/edit/002-typing.mu new file mode 100644 index 00000000..717c630e --- /dev/null +++ b/edit/002-typing.mu @@ -0,0 +1,1012 @@ +## handling events from the keyboard, mouse, touch screen, ... + +recipe editor-event-loop [ + local-scope + screen:address <- next-ingredient + console:address <- next-ingredient + editor:address:editor-data <- next-ingredient + { + # looping over each (keyboard or touch) event as it occurs + +next-event + e:event, console:address, found?:boolean, quit?:boolean <- read-event console + loop-unless found? + break-if quit? # only in tests + trace 10, [app], [next-event] + # 'touch' event + t:address:touch-event <- maybe-convert e, touch:variant + { + break-unless t + move-cursor-in-editor screen, editor, *t + loop +next-event:label + } + # keyboard events + { + break-if t + screen, editor, go-render?:boolean <- handle-keyboard-event screen, editor, e + { + break-unless go-render? + editor-render screen, editor + } + } + loop + } +] + +# process click, return if it was on current editor +recipe move-cursor-in-editor [ + local-scope + screen:address <- next-ingredient + editor:address:editor-data <- next-ingredient + t:touch-event <- next-ingredient + reply-unless editor, 0/false + click-row:number <- get t, row:offset + reply-unless click-row, 0/false # ignore clicks on 'menu' + click-column:number <- get t, column:offset + left:number <- get *editor, left:offset + too-far-left?:boolean <- lesser-than click-column, left + reply-if too-far-left?, 0/false + right:number <- get *editor, right:offset + too-far-right?:boolean <- greater-than click-column, right + reply-if too-far-right?, 0/false + # position cursor + <move-cursor-begin> + editor <- snap-cursor screen, editor, click-row, click-column + undo-coalesce-tag:number <- copy 0/never + <move-cursor-end> + # gain focus + reply 1/true +] + +# editor <- snap-cursor screen:address, editor:address:editor-data, target-row:number, target-column:number +# +# Variant of 'render' that only moves the cursor (coordinates and +# before-cursor). If it's past the end of a line, it 'slides' it left. If it's +# past the last line it positions at end of last line. +recipe snap-cursor [ + local-scope + screen:address <- next-ingredient + editor:address:editor-data <- next-ingredient + target-row:number <- next-ingredient + target-column:number <- next-ingredient + reply-unless editor, 1/top, editor/same-as-ingredient:1 + left:number <- get *editor, left:offset + right:number <- get *editor, right:offset + screen-height:number <- screen-height screen + # count newlines until screen row + curr:address:duplex-list <- get *editor, top-of-screen:offset + prev:address:duplex-list <- copy curr # just in case curr becomes null and we can't compute prev-duplex + curr <- next-duplex curr + row:number <- copy 1/top + column:number <- copy left + cursor-row:address:number <- get-address *editor, cursor-row:offset + *cursor-row <- copy target-row + cursor-column:address:number <- get-address *editor, cursor-column:offset + *cursor-column <- copy target-column + before-cursor:address:address:duplex-list <- get-address *editor, before-cursor:offset + { + +next-character + break-unless curr + off-screen?:boolean <- greater-or-equal row, screen-height + break-if off-screen? + # update editor-data.before-cursor + # Doing so at the start of each iteration ensures it stays one step behind + # the current character. + { + at-cursor-row?:boolean <- equal row, *cursor-row + break-unless at-cursor-row? + at-cursor?:boolean <- equal column, *cursor-column + break-unless at-cursor? + *before-cursor <- copy prev + } + c:character <- get *curr, value:offset + { + # newline? move to left rather than 0 + newline?:boolean <- equal c, 10/newline + break-unless newline? + # adjust cursor if necessary + { + at-cursor-row?:boolean <- equal row, *cursor-row + break-unless at-cursor-row? + left-of-cursor?:boolean <- lesser-than column, *cursor-column + break-unless left-of-cursor? + *cursor-column <- copy column + *before-cursor <- copy prev + } + # skip to next line + row <- add row, 1 + column <- copy left + curr <- next-duplex curr + prev <- next-duplex prev + loop +next-character:label + } + { + # at right? wrap. even if there's only one more letter left; we need + # room for clicking on the cursor after it. + at-right?:boolean <- equal column, right + break-unless at-right? + column <- copy left + row <- add row, 1 + # don't increment curr/prev + loop +next-character:label + } + curr <- next-duplex curr + prev <- next-duplex prev + column <- add column, 1 + loop + } + # is cursor to the right of the last line? move to end + { + at-cursor-row?:boolean <- equal row, *cursor-row + cursor-outside-line?:boolean <- lesser-or-equal column, *cursor-column + before-cursor-on-same-line?:boolean <- and at-cursor-row?, cursor-outside-line? + above-cursor-row?:boolean <- lesser-than row, *cursor-row + before-cursor?:boolean <- or before-cursor-on-same-line?, above-cursor-row? + break-unless before-cursor? + *cursor-row <- copy row + *cursor-column <- copy column + *before-cursor <- copy prev + } + reply editor/same-as-ingredient:1 +] + +# screen, editor, go-render?:boolean <- handle-keyboard-event screen:address, editor:address:editor-data, e:event +# Process an event 'e' and try to minimally update the screen. +# Set 'go-render?' to true to indicate the caller must perform a non-minimal update. +recipe handle-keyboard-event [ + local-scope + screen:address <- next-ingredient + editor:address:editor-data <- next-ingredient + e:event <- next-ingredient + reply-unless editor, screen/same-as-ingredient:0, editor/same-as-ingredient:1, 0/no-more-render + screen-width:number <- screen-width screen + screen-height:number <- screen-height screen + left:number <- get *editor, left:offset + right:number <- get *editor, right:offset + before-cursor:address:address:duplex-list <- get-address *editor, before-cursor:offset + cursor-row:address:number <- get-address *editor, cursor-row:offset + cursor-column:address:number <- get-address *editor, cursor-column:offset + save-row:number <- copy *cursor-row + save-column:number <- copy *cursor-column + # character + { + c:address:character <- maybe-convert e, text:variant + break-unless c + trace 10, [app], [handle-keyboard-event: special character] + # exceptions for special characters go here + <handle-special-character> + # ignore any other special characters + regular-character?:boolean <- greater-or-equal *c, 32/space + reply-unless regular-character?, screen/same-as-ingredient:0, editor/same-as-ingredient:1, 0/no-more-render + # otherwise type it in + <insert-character-begin> + editor, screen, go-render?:boolean <- insert-at-cursor editor, *c, screen + <insert-character-end> + reply screen/same-as-ingredient:0, editor/same-as-ingredient:1, go-render? + } + # special key to modify the text or move the cursor + k:address:number <- maybe-convert e:event, keycode:variant + assert k, [event was of unknown type; neither keyboard nor mouse] + # handlers for each special key will go here + <handle-special-key> + reply screen/same-as-ingredient:0, editor/same-as-ingredient:1, 1/go-render +] + +recipe insert-at-cursor [ + local-scope + editor:address:editor-data <- next-ingredient + c:character <- next-ingredient + screen:address <- next-ingredient + before-cursor:address:address:duplex-list <- get-address *editor, before-cursor:offset + insert-duplex c, *before-cursor + *before-cursor <- next-duplex *before-cursor + cursor-row:address:number <- get-address *editor, cursor-row:offset + cursor-column:address:number <- get-address *editor, cursor-column:offset + left:number <- get *editor, left:offset + right:number <- get *editor, right:offset + save-row:number <- copy *cursor-row + save-column:number <- copy *cursor-column + screen-width:number <- screen-width screen + screen-height:number <- screen-height screen + # occasionally we'll need to mess with the cursor + <insert-character-special-case> + # but mostly we'll just move the cursor right + *cursor-column <- add *cursor-column, 1 + next:address:duplex-list <- next-duplex *before-cursor + { + # at end of all text? no need to scroll? just print the character and leave + at-end?:boolean <- equal next, 0/null + break-unless at-end? + bottom:number <- subtract screen-height, 1 + at-bottom?:boolean <- equal save-row, bottom + at-right?:boolean <- equal save-column, right + overflow?:boolean <- and at-bottom?, at-right? + break-if overflow? + move-cursor screen, save-row, save-column + print-character screen, c + reply editor/same-as-ingredient:0, screen/same-as-ingredient:2, 0/no-more-render + } + { + # not at right margin? print the character and rest of line + break-unless next + at-right?:boolean <- greater-or-equal *cursor-column, screen-width + break-if at-right? + curr:address:duplex-list <- copy *before-cursor + move-cursor screen, save-row, save-column + curr-column:number <- copy save-column + { + # hit right margin? give up and let caller render + at-right?:boolean <- greater-than curr-column, right + reply-if at-right?, editor/same-as-ingredient:0, screen/same-as-ingredient:2, 1/go-render + break-unless curr + # newline? done. + currc:character <- get *curr, value:offset + at-newline?:boolean <- equal currc, 10/newline + break-if at-newline? + print-character screen, currc + curr-column <- add curr-column, 1 + curr <- next-duplex curr + loop + } + reply editor/same-as-ingredient:0, screen/same-as-ingredient:2, 0/no-more-render + } + reply editor/same-as-ingredient:0, screen/same-as-ingredient:2, 1/go-render +] + +# helper for tests +recipe editor-render [ + local-scope + screen:address <- next-ingredient + editor:address:editor-data <- next-ingredient + left:number <- get *editor, left:offset + right:number <- get *editor, right:offset + row:number, column:number <- render screen, editor + clear-line-delimited screen, column, right + row <- add row, 1 + draw-horizontal screen, row, left, right, 9480/horizontal-dotted + row <- add row, 1 + clear-screen-from screen, row, left, left, right +] + +scenario editor-handles-empty-event-queue [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + editor-render screen, 2:address:editor-data + assume-console [] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .abc . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] +] + +scenario editor-handles-mouse-clicks [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + left-click 1, 1 # on the 'b' + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + screen-should-contain [ + . . + .abc . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] + memory-should-contain [ + 3 <- 1 # cursor is at row 0.. + 4 <- 1 # ..and column 1 + ] + check-trace-count-for-label 0, [print-character] +] + +scenario editor-handles-mouse-clicks-outside-text [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + $clear-trace + assume-console [ + left-click 1, 7 # last line, to the right of text + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + memory-should-contain [ + 3 <- 1 # cursor row + 4 <- 3 # cursor column + ] + check-trace-count-for-label 0, [print-character] +] + +scenario editor-handles-mouse-clicks-outside-text-2 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc +def] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + $clear-trace + assume-console [ + left-click 1, 7 # interior line, to the right of text + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + memory-should-contain [ + 3 <- 1 # cursor row + 4 <- 3 # cursor column + ] + check-trace-count-for-label 0, [print-character] +] + +scenario editor-handles-mouse-clicks-outside-text-3 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc +def] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + $clear-trace + assume-console [ + left-click 3, 7 # below text + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + memory-should-contain [ + 3 <- 2 # cursor row + 4 <- 3 # cursor column + ] + check-trace-count-for-label 0, [print-character] +] + +scenario editor-handles-mouse-clicks-outside-column [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + # editor occupies only left half of screen + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + # click on right half of screen + left-click 3, 8 + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + screen-should-contain [ + . . + .abc . + .┈┈┈┈┈ . + . . + ] + memory-should-contain [ + 3 <- 1 # no change to cursor row + 4 <- 0 # ..or column + ] + check-trace-count-for-label 0, [print-character] +] + +scenario editor-handles-mouse-clicks-in-menu-area [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + # click on first, 'menu' row + left-click 0, 3 + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + # no change to cursor + memory-should-contain [ + 3 <- 1 + 4 <- 0 + ] +] + +scenario editor-inserts-characters-into-empty-editor [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + type [abc] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .abc . + .┈┈┈┈┈ . + . . + ] + check-trace-count-for-label 3, [print-character] +] + +scenario editor-inserts-characters-at-cursor [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + editor-render screen, 2:address:editor-data + $clear-trace + # type two letters at different places + assume-console [ + type [0] + left-click 1, 2 + type [d] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .0adbc . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] + check-trace-count-for-label 7, [print-character] # 4 for first letter, 3 for second +] + +scenario editor-inserts-characters-at-cursor-2 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + left-click 1, 5 # right of last line + type [d] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .abcd . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] + check-trace-count-for-label 1, [print-character] +] + +scenario editor-inserts-characters-at-cursor-5 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc +d] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + left-click 1, 5 # right of non-last line + type [e] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .abce . + .d . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] + check-trace-count-for-label 1, [print-character] +] + +scenario editor-inserts-characters-at-cursor-3 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + left-click 3, 5 # below all text + type [d] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .abcd . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] + check-trace-count-for-label 1, [print-character] +] + +scenario editor-inserts-characters-at-cursor-4 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc +d] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + left-click 3, 5 # below all text + type [e] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .abc . + .de . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] + check-trace-count-for-label 1, [print-character] +] + +scenario editor-inserts-characters-at-cursor-6 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc +d] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + editor-render screen, 2:address:editor-data + $clear-trace + assume-console [ + left-click 3, 5 # below all text + type [ef] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .abc . + .def . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] + check-trace-count-for-label 2, [print-character] +] + +scenario editor-moves-cursor-after-inserting-characters [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [ab] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + editor-render screen, 2:address:editor-data + assume-console [ + type [01] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .01ab . + .┈┈┈┈┈ . + . . + ] +] + +# if the cursor reaches the right margin, wrap the line + +scenario editor-wraps-line-on-insert [ + assume-screen 5/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + editor-render screen, 2:address:editor-data + # type a letter + assume-console [ + type [e] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + # no wrap yet + screen-should-contain [ + . . + .eabc . + .┈┈┈┈┈. + . . + . . + ] + # type a second letter + assume-console [ + type [f] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + # now wrap + screen-should-contain [ + . . + .efab↩. + .c . + .┈┈┈┈┈. + . . + ] +] + +scenario editor-wraps-line-on-insert-2 [ + # create an editor with some text + assume-screen 10/width, 5/height + 1:address:array:character <- new [abcdefg +defg] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + editor-render screen, 2:address:editor-data + # type more text at the start + assume-console [ + left-click 3, 0 + type [abc] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + # cursor is not wrapped + memory-should-contain [ + 3 <- 3 + 4 <- 3 + ] + # but line is wrapped + screen-should-contain [ + . . + .abcd↩ . + .efg . + .abcd↩ . + .efg . + ] +] + +after <insert-character-special-case> [ + # if the line wraps at the cursor, move cursor to start of next row + { + # if we're at the column just before the wrap indicator + wrap-column:number <- subtract right, 1 + at-wrap?:boolean <- greater-or-equal *cursor-column, wrap-column + break-unless at-wrap? + *cursor-column <- subtract *cursor-column, wrap-column + *cursor-row <- add *cursor-row, 1 + # if we're out of the screen, scroll down + { + below-screen?:boolean <- greater-or-equal *cursor-row, screen-height + break-unless below-screen? + <scroll-down> + } + reply editor/same-as-ingredient:0, screen/same-as-ingredient:2, 1/go-render + } +] + +scenario editor-wraps-cursor-after-inserting-characters [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abcde] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + assume-console [ + left-click 1, 4 # line is full; no wrap icon yet + type [f] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + screen-should-contain [ + . . + .abcd↩ . + .fe . + .┈┈┈┈┈ . + . . + ] + memory-should-contain [ + 3 <- 2 # cursor row + 4 <- 1 # cursor column + ] +] + +scenario editor-wraps-cursor-after-inserting-characters-2 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abcde] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + assume-console [ + left-click 1, 3 # right before the wrap icon + type [f] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + screen-should-contain [ + . . + .abcf↩ . + .de . + .┈┈┈┈┈ . + . . + ] + memory-should-contain [ + 3 <- 2 # cursor row + 4 <- 0 # cursor column + ] +] + +# if newline, move cursor to start of next line, and maybe align indent with previous line + +container editor-data [ + indent?:boolean +] + +after <editor-initialization> [ + indent?:address:boolean <- get-address *result, indent?:offset + *indent? <- copy 1/true +] + +scenario editor-moves-cursor-down-after-inserting-newline [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + assume-console [ + type [0 +1] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + .0 . + .1abc . + .┈┈┈┈┈┈┈┈┈┈. + . . + ] +] + +after <handle-special-character> [ + { + newline?:boolean <- equal *c, 10/newline + break-unless newline? + <insert-enter-begin> + editor <- insert-new-line-and-indent editor, screen + <insert-enter-end> + reply screen/same-as-ingredient:0, editor/same-as-ingredient:1, 1/go-render + } +] + +recipe insert-new-line-and-indent [ + local-scope + editor:address:editor-data <- next-ingredient + screen:address <- next-ingredient + cursor-row:address:number <- get-address *editor, cursor-row:offset + cursor-column:address:number <- get-address *editor, cursor-column:offset + before-cursor:address:address:duplex-list <- get-address *editor, before-cursor:offset + left:number <- get *editor, left:offset + right:number <- get *editor, right:offset + screen-height:number <- screen-height screen + # insert newline + insert-duplex 10/newline, *before-cursor + *before-cursor <- next-duplex *before-cursor + *cursor-row <- add *cursor-row, 1 + *cursor-column <- copy left + # maybe scroll + { + below-screen?:boolean <- greater-or-equal *cursor-row, screen-height # must be equal, never greater + break-unless below-screen? + <scroll-down> + *cursor-row <- subtract *cursor-row, 1 # bring back into screen range + } + # indent if necessary + indent?:boolean <- get *editor, indent?:offset + reply-unless indent?, editor/same-as-ingredient:0, screen/same-as-ingredient:1 + d:address:duplex-list <- get *editor, data:offset + end-of-previous-line:address:duplex-list <- prev-duplex *before-cursor + indent:number <- line-indent end-of-previous-line, d + i:number <- copy 0 + { + indent-done?:boolean <- greater-or-equal i, indent + break-if indent-done? + editor, screen, go-render?:boolean <- insert-at-cursor editor, 32/space, screen + i <- add i, 1 + loop + } + reply editor/same-as-ingredient:0, screen/same-as-ingredient:1 +] + +# takes a pointer 'curr' into the doubly-linked list and its sentinel, counts +# the number of spaces at the start of the line containing 'curr'. +recipe line-indent [ + local-scope + curr:address:duplex-list <- next-ingredient + start:address:duplex-list <- next-ingredient + result:number <- copy 0 + reply-unless curr, result + at-start?:boolean <- equal curr, start + reply-if at-start?, result + { + curr <- prev-duplex curr + break-unless curr + at-start?:boolean <- equal curr, start + break-if at-start? + c:character <- get *curr, value:offset + at-newline?:boolean <- equal c, 10/newline + break-if at-newline? + # if c is a space, increment result + is-space?:boolean <- equal c, 32/space + { + break-unless is-space? + result <- add result, 1 + } + # if c is not a space, reset result + { + break-if is-space? + result <- copy 0 + } + loop + } + reply result +] + +scenario editor-moves-cursor-down-after-inserting-newline-2 [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abc] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 1/left, 10/right + assume-console [ + type [0 +1] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + screen-should-contain [ + . . + . 0 . + . 1abc . + . ┈┈┈┈┈┈┈┈┈. + . . + ] +] + +scenario editor-clears-previous-line-completely-after-inserting-newline [ + assume-screen 10/width, 5/height + 1:address:array:character <- new [abcde] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 5/right + assume-console [ + press enter + ] + screen-should-contain [ + . . + .abcd↩ . + .e . + . . + . . + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + ] + # line should be fully cleared + screen-should-contain [ + . . + . . + .abcd↩ . + .e . + .┈┈┈┈┈ . + ] +] + +scenario editor-inserts-indent-after-newline [ + assume-screen 10/width, 10/height + 1:address:array:character <- new [ab + cd +ef] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + # position cursor after 'cd' and hit 'newline' + assume-console [ + left-click 2, 8 + type [ +] + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + # cursor should be below start of previous line + memory-should-contain [ + 3 <- 3 # cursor row + 4 <- 2 # cursor column (indented) + ] +] + +scenario editor-skips-indent-around-paste [ + assume-screen 10/width, 10/height + 1:address:array:character <- new [ab + cd +ef] + 2:address:editor-data <- new-editor 1:address:array:character, screen:address, 0/left, 10/right + # position cursor after 'cd' and hit 'newline' surrounded by paste markers + assume-console [ + left-click 2, 8 + press 65507 # start paste + press enter + press 65506 # end paste + ] + run [ + editor-event-loop screen:address, console:address, 2:address:editor-data + 3:number <- get *2:address:editor-data, cursor-row:offset + 4:number <- get *2:address:editor-data, cursor-column:offset + ] + # cursor should be below start of previous line + memory-should-contain [ + 3 <- 3 # cursor row + 4 <- 0 # cursor column (not indented) + ] +] + +after <handle-special-key> [ + { + paste-start?:boolean <- equal *k, 65507/paste-start + break-unless paste-start? + indent?:address:boolean <- get-address *editor, indent?:offset + *indent? <- copy 0/false + reply screen/same-as-ingredient:0, editor/same-as-ingredient:1, 1/go-render + } +] + +after <handle-special-key> [ + { + paste-end?:boolean <- equal *k, 65506/paste-end + break-unless paste-end? + indent?:address:boolean <- get-address *editor, indent?:offset + *indent? <- copy 1/true + reply screen/same-as-ingredient:0, editor/same-as-ingredient:1, 1/go-render + } +] + +## helpers + +recipe draw-horizontal [ + local-scope + screen:address <- next-ingredient + row:number <- next-ingredient + x:number <- next-ingredient + right:number <- next-ingredient + style:character, style-found?:boolean <- next-ingredient + { + break-if style-found? + style <- copy 9472/horizontal + } + color:number, color-found?:boolean <- next-ingredient + { + # default color to white + break-if color-found? + color <- copy 245/grey + } + bg-color:number, bg-color-found?:boolean <- next-ingredient + { + break-if bg-color-found? + bg-color <- copy 0/black + } + screen <- move-cursor screen, row, x + { + continue?:boolean <- lesser-or-equal x, right # right is inclusive, to match editor-data semantics + break-unless continue? + print-character screen, style, color, bg-color + x <- add x, 1 + loop + } +] |