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<span class="SalientComment">## handling events from the keyboard, mouse, touch screen, ...</span>
<span class="Comment"># temporary main: interactive editor</span>
<span class="Comment"># hit ctrl-c to exit</span>
<span class="muRecipe">def!</span> main text:text [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
open-console
editor:&:editor <span class="Special"><-</span> new-editor text, <span class="Constant">0/screen</span>, <span class="Constant">5/left</span>, <span class="Constant">45/right</span>
editor-event-loop <span class="Constant">0/screen</span>, <span class="Constant">0/console</span>, editor
close-console
]
<span class="muRecipe">def</span> editor-event-loop screen:&:screen, console:&:console, editor:&:editor<span class="muRecipe"> -> </span>screen:&:screen, console:&:console, editor:&:editor [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
<span class="Comment"># looping over each (keyboard or touch) event as it occurs</span>
<span class="Constant"> +next-event</span>
cursor-row:num <span class="Special"><-</span> get *editor, <span class="Constant">cursor-row:offset</span>
cursor-column:num <span class="Special"><-</span> get *editor, <span class="Constant">cursor-column:offset</span>
screen <span class="Special"><-</span> move-cursor screen, cursor-row, cursor-column
e:event, found?:bool, quit?:bool, console <span class="Special"><-</span> read-event console
<span class="muControl">loop-unless</span> found?
<span class="muControl">break-if</span> quit? <span class="Comment"># only in tests</span>
trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[next-event]</span>
<span class="Comment"># 'touch' event</span>
t:touch-event, is-touch?:bool <span class="Special"><-</span> maybe-convert e, <span class="Constant">touch:variant</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> is-touch?
move-cursor-in-editor screen, editor, t
<span class="muControl">loop</span> <span class="Constant">+next-event</span>
<span class="Delimiter">}</span>
<span class="Comment"># keyboard events</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> is-touch?
screen, editor, go-render?:bool <span class="Special"><-</span> handle-keyboard-event screen, editor, e
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> go-render?
screen <span class="Special"><-</span> editor-render screen, editor
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="Comment"># process click, return if it was on current editor</span>
<span class="muRecipe">def</span> move-cursor-in-editor screen:&:screen, editor:&:editor, t:touch-event<span class="muRecipe"> -> </span>in-focus?:bool, editor:&:editor [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="muControl">return-unless</span> editor, <span class="Constant">0/false</span>
click-row:num <span class="Special"><-</span> get t, <span class="Constant">row:offset</span>
<span class="muControl">return-unless</span> click-row, <span class="Constant">0/false</span> <span class="Comment"># ignore clicks on 'menu'</span>
click-column:num <span class="Special"><-</span> get t, <span class="Constant">column:offset</span>
left:num <span class="Special"><-</span> get *editor, <span class="Constant">left:offset</span>
too-far-left?:bool <span class="Special"><-</span> lesser-than click-column, left
<span class="muControl">return-if</span> too-far-left?, <span class="Constant">0/false</span>
right:num <span class="Special"><-</span> get *editor, <span class="Constant">right:offset</span>
too-far-right?:bool <span class="Special"><-</span> greater-than click-column, right
<span class="muControl">return-if</span> too-far-right?, <span class="Constant">0/false</span>
<span class="Comment"># position cursor</span>
<span class="Constant"> <move-cursor-begin></span>
editor <span class="Special"><-</span> snap-cursor screen, editor, click-row, click-column
undo-coalesce-tag:num <span class="Special"><-</span> copy <span class="Constant">0/never</span>
<span class="Constant"> <move-cursor-end></span>
<span class="Comment"># gain focus</span>
<span class="muControl">return</span> <span class="Constant">1/true</span>
]
<span class="Comment"># Variant of 'render' that only moves the cursor (coordinates and</span>
<span class="Comment"># before-cursor). If it's past the end of a line, it 'slides' it left. If it's</span>
<span class="Comment"># past the last line it positions at end of last line.</span>
<span class="muRecipe">def</span> snap-cursor screen:&:screen, editor:&:editor, target-row:num, target-column:num<span class="muRecipe"> -> </span>editor:&:editor [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="muControl">return-unless</span> editor
left:num <span class="Special"><-</span> get *editor, <span class="Constant">left:offset</span>
right:num <span class="Special"><-</span> get *editor, <span class="Constant">right:offset</span>
screen-height:num <span class="Special"><-</span> screen-height screen
<span class="Comment"># count newlines until screen row</span>
curr:&:duplex-list:char <span class="Special"><-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
prev:&:duplex-list:char <span class="Special"><-</span> copy curr <span class="Comment"># just in case curr becomes null and we can't compute prev</span>
curr <span class="Special"><-</span> next curr
row:num <span class="Special"><-</span> copy <span class="Constant">1/top</span>
column:num <span class="Special"><-</span> copy left
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-row:offset</span>, target-row
cursor-row:num <span class="Special"><-</span> copy target-row
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-column:offset</span>, target-column
cursor-column:num <span class="Special"><-</span> copy target-column
before-cursor:&:duplex-list:char <span class="Special"><-</span> get *editor, <span class="Constant">before-cursor:offset</span>
<span class="Delimiter">{</span>
<span class="Constant"> +next-character</span>
<span class="muControl">break-unless</span> curr
off-screen?:bool <span class="Special"><-</span> greater-or-equal row, screen-height
<span class="muControl">break-if</span> off-screen?
<span class="Comment"># update editor.before-cursor</span>
<span class="Comment"># Doing so at the start of each iteration ensures it stays one step behind</span>
<span class="Comment"># the current character.</span>
<span class="Delimiter">{</span>
at-cursor-row?:bool <span class="Special"><-</span> equal row, cursor-row
<span class="muControl">break-unless</span> at-cursor-row?
at-cursor?:bool <span class="Special"><-</span> equal column, cursor-column
<span class="muControl">break-unless</span> at-cursor?
before-cursor <span class="Special"><-</span> copy prev
*editor <span class="Special"><-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
<span class="Delimiter">}</span>
c:char <span class="Special"><-</span> get *curr, <span class="Constant">value:offset</span>
<span class="Delimiter">{</span>
<span class="Comment"># newline? move to left rather than 0</span>
newline?:bool <span class="Special"><-</span> equal c, <span class="Constant">10/newline</span>
<span class="muControl">break-unless</span> newline?
<span class="Comment"># adjust cursor if necessary</span>
<span class="Delimiter">{</span>
at-cursor-row?:bool <span class="Special"><-</span> equal row, cursor-row
<span class="muControl">break-unless</span> at-cursor-row?
left-of-cursor?:bool <span class="Special"><-</span> lesser-than column, cursor-column
<span class="muControl">break-unless</span> left-of-cursor?
cursor-column <span class="Special"><-</span> copy column
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
before-cursor <span class="Special"><-</span> copy prev
*editor <span class="Special"><-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
<span class="Delimiter">}</span>
<span class="Comment"># skip to next line</span>
row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
column <span class="Special"><-</span> copy left
curr <span class="Special"><-</span> next curr
prev <span class="Special"><-</span> next prev
<span class="muControl">loop</span> <span class="Constant">+next-character</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
<span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
<span class="Comment"># room for clicking on the cursor after it.</span>
at-right?:bool <span class="Special"><-</span> equal column, right
<span class="muControl">break-unless</span> at-right?
column <span class="Special"><-</span> copy left
row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
<span class="Comment"># don't increment curr/prev</span>
<span class="muControl">loop</span> <span class="Constant">+next-character</span>
<span class="Delimiter">}</span>
curr <span class="Special"><-</span> next curr
prev <span class="Special"><-</span> next prev
column <span class="Special"><-</span> add column,<span class="Constant"> 1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># is cursor to the right of the last line? move to end</span>
<span class="Delimiter">{</span>
at-cursor-row?:bool <span class="Special"><-</span> equal row, cursor-row
cursor-outside-line?:bool <span class="Special"><-</span> lesser-or-equal column, cursor-column
before-cursor-on-same-line?:bool <span class="Special"><-</span> and at-cursor-row?, cursor-outside-line?
above-cursor-row?:bool <span class="Special"><-</span> lesser-than row, cursor-row
before-cursor?:bool <span class="Special"><-</span> or before-cursor-on-same-line?, above-cursor-row?
<span class="muControl">break-unless</span> before-cursor?
cursor-row <span class="Special"><-</span> copy row
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
cursor-column <span class="Special"><-</span> copy column
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
before-cursor <span class="Special"><-</span> copy prev
*editor <span class="Special"><-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
<span class="Delimiter">}</span>
]
<span class="Comment"># Process an event 'e' and try to minimally update the screen.</span>
<span class="Comment"># Set 'go-render?' to true to indicate the caller must perform a non-minimal update.</span>
<span class="muRecipe">def</span> handle-keyboard-event screen:&:screen, editor:&:editor, e:event<span class="muRecipe"> -> </span>screen:&:screen, editor:&:editor, go-render?:bool [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
go-render? <span class="Special"><-</span> copy <span class="Constant">0/false</span>
<span class="muControl">return-unless</span> editor
screen-width:num <span class="Special"><-</span> screen-width screen
screen-height:num <span class="Special"><-</span> screen-height screen
left:num <span class="Special"><-</span> get *editor, <span class="Constant">left:offset</span>
right:num <span class="Special"><-</span> get *editor, <span class="Constant">right:offset</span>
before-cursor:&:duplex-list:char <span class="Special"><-</span> get *editor, <span class="Constant">before-cursor:offset</span>
cursor-row:num <span class="Special"><-</span> get *editor, <span class="Constant">cursor-row:offset</span>
cursor-column:num <span class="Special"><-</span> get *editor, <span class="Constant">cursor-column:offset</span>
save-row:num <span class="Special"><-</span> copy cursor-row
save-column:num <span class="Special"><-</span> copy cursor-column
<span class="Comment"># character</span>
<span class="Delimiter">{</span>
c:char, is-unicode?:bool <span class="Special"><-</span> maybe-convert e, <span class="Constant">text:variant</span>
<span class="muControl">break-unless</span> is-unicode?
trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[handle-keyboard-event: special character]</span>
<span class="Comment"># exceptions for special characters go here</span>
<span class="Constant"> <handle-special-character></span>
<span class="Comment"># ignore any other special characters</span>
regular-character?:bool <span class="Special"><-</span> greater-or-equal c, <span class="Constant">32/space</span>
go-render? <span class="Special"><-</span> copy <span class="Constant">0/false</span>
<span class="muControl">return-unless</span> regular-character?
<span class="Comment"># otherwise type it in</span>
<span class="Constant"> <insert-character-begin></span>
editor, screen, go-render?:bool <span class="Special"><-</span> insert-at-cursor editor, c, screen
<span class="Constant"> <insert-character-end></span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># special key to modify the text or move the cursor</span>
k:num, is-keycode?:bool <span class="Special"><-</span> maybe-convert e:event, <span class="Constant">keycode:variant</span>
assert is-keycode?, <span class="Constant">[event was of unknown type; neither keyboard nor mouse]</span>
<span class="Comment"># handlers for each special key will go here</span>
<span class="Constant"> <handle-special-key></span>
go-render? <span class="Special"><-</span> copy <span class="Constant">1/true</span>
<span class="muControl">return</span>
]
<span class="muRecipe">def</span> insert-at-cursor editor:&:editor, c:char, screen:&:screen<span class="muRecipe"> -> </span>editor:&:editor, screen:&:screen, go-render?:bool [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
before-cursor:&:duplex-list:char <span class="Special"><-</span> get *editor, <span class="Constant">before-cursor:offset</span>
insert c, before-cursor
before-cursor <span class="Special"><-</span> next before-cursor
*editor <span class="Special"><-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
cursor-row:num <span class="Special"><-</span> get *editor, <span class="Constant">cursor-row:offset</span>
cursor-column:num <span class="Special"><-</span> get *editor, <span class="Constant">cursor-column:offset</span>
left:num <span class="Special"><-</span> get *editor, <span class="Constant">left:offset</span>
right:num <span class="Special"><-</span> get *editor, <span class="Constant">right:offset</span>
save-row:num <span class="Special"><-</span> copy cursor-row
save-column:num <span class="Special"><-</span> copy cursor-column
screen-width:num <span class="Special"><-</span> screen-width screen
screen-height:num <span class="Special"><-</span> screen-height screen
<span class="Comment"># occasionally we'll need to mess with the cursor</span>
<span class="Constant"> <insert-character-special-case></span>
<span class="Comment"># but mostly we'll just move the cursor right</span>
cursor-column <span class="Special"><-</span> add cursor-column,<span class="Constant"> 1</span>
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
next:&:duplex-list:char <span class="Special"><-</span> next before-cursor
<span class="Delimiter">{</span>
<span class="Comment"># at end of all text? no need to scroll? just print the character and leave</span>
at-end?:bool <span class="Special"><-</span> equal next, <span class="Constant">0/null</span>
<span class="muControl">break-unless</span> at-end?
bottom:num <span class="Special"><-</span> subtract screen-height,<span class="Constant"> 1</span>
at-bottom?:bool <span class="Special"><-</span> equal save-row, bottom
at-right?:bool <span class="Special"><-</span> equal save-column, right
overflow?:bool <span class="Special"><-</span> and at-bottom?, at-right?
<span class="muControl">break-if</span> overflow?
move-cursor screen, save-row, save-column
print screen, c
go-render? <span class="Special"><-</span> copy <span class="Constant">0/false</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
<span class="Comment"># not at right margin? print the character and rest of line</span>
<span class="muControl">break-unless</span> next
at-right?:bool <span class="Special"><-</span> greater-or-equal cursor-column, screen-width
<span class="muControl">break-if</span> at-right?
curr:&:duplex-list:char <span class="Special"><-</span> copy before-cursor
move-cursor screen, save-row, save-column
curr-column:num <span class="Special"><-</span> copy save-column
<span class="Delimiter">{</span>
<span class="Comment"># hit right margin? give up and let caller render</span>
go-render? <span class="Special"><-</span> copy <span class="Constant">1/true</span>
at-right?:bool <span class="Special"><-</span> greater-than curr-column, right
<span class="muControl">return-if</span> at-right?
<span class="muControl">break-unless</span> curr
<span class="Comment"># newline? done.</span>
currc:char <span class="Special"><-</span> get *curr, <span class="Constant">value:offset</span>
at-newline?:bool <span class="Special"><-</span> equal currc, <span class="Constant">10/newline</span>
<span class="muControl">break-if</span> at-newline?
print screen, currc
curr-column <span class="Special"><-</span> add curr-column,<span class="Constant"> 1</span>
curr <span class="Special"><-</span> next curr
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
go-render? <span class="Special"><-</span> copy <span class="Constant">0/false</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
go-render? <span class="Special"><-</span> copy <span class="Constant">1/true</span>
<span class="muControl">return</span>
]
<span class="Comment"># helper for tests</span>
<span class="muRecipe">def</span> editor-render screen:&:screen, editor:&:editor<span class="muRecipe"> -> </span>screen:&:screen, editor:&:editor [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
left:num <span class="Special"><-</span> get *editor, <span class="Constant">left:offset</span>
right:num <span class="Special"><-</span> get *editor, <span class="Constant">right:offset</span>
row:num, column:num <span class="Special"><-</span> render screen, editor
clear-line-until screen, right
row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
draw-horizontal screen, row, left, right, <span class="Constant">9480/horizontal-dotted</span>
row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
clear-screen-from screen, row, left, left, right
]
<span class="muScenario">scenario</span> editor-handles-empty-event-queue [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
editor-render screen, e
assume-console <span class="Constant">[]</span>
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abc .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span> <span class="Comment"># on the 'b'</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abc .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># cursor is at row 0..</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># ..and column 1</span>
]
check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 1</span>,<span class="Constant"> 7</span> <span class="Comment"># last line, to the right of text</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># cursor row</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 3</span> <span class="Comment"># cursor column</span>
]
check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text-2 [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
s:text <span class="Special"><-</span> new <span class="Constant">[abc</span>
<span class="Constant">def]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 1</span>,<span class="Constant"> 7</span> <span class="Comment"># interior line, to the right of text</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># cursor row</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 3</span> <span class="Comment"># cursor column</span>
]
check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text-3 [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
s:text <span class="Special"><-</span> new <span class="Constant">[abc</span>
<span class="Constant">def]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 3</span>,<span class="Constant"> 7</span> <span class="Comment"># below text</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 2</span> <span class="Comment"># cursor row</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 3</span> <span class="Comment"># cursor column</span>
]
check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-column [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
<span class="Comment"># editor occupies only left half of screen</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
<span class="Comment"># click on right half of screen</span>
left-click<span class="Constant"> 3</span>,<span class="Constant"> 8</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abc .</span>
<span class="Constant"> .╌╌╌╌╌ .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># no change to cursor row</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># ..or column</span>
]
check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-in-menu-area [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
<span class="Comment"># click on first, 'menu' row</span>
left-click<span class="Constant"> 0</span>,<span class="Constant"> 3</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
<span class="Comment"># no change to cursor</span>
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 1</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 0</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-characters-into-empty-editor [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
type <span class="Constant">[abc]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abc .</span>
<span class="Constant"> .╌╌╌╌╌ .</span>
<span class="Constant"> . .</span>
]
check-trace-count-for-label<span class="Constant"> 3</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
<span class="Comment"># type two letters at different places</span>
assume-console [
type <span class="Constant">[0]</span>
left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
type <span class="Constant">[d]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .0adbc .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
check-trace-count-for-label<span class="Constant"> 7</span>, <span class="Constant">[print-character]</span> <span class="Comment"># 4 for first letter, 3 for second</span>
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-2 [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span> <span class="Comment"># right of last line</span>
type <span class="Constant">[d]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abcd .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-5 [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
s:text <span class="Special"><-</span> new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span> <span class="Comment"># right of non-last line</span>
type <span class="Constant">[e]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abce .</span>
<span class="Constant"> .d .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-3 [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span> <span class="Comment"># below all text</span>
type <span class="Constant">[d]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abcd .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-4 [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
s:text <span class="Special"><-</span> new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span> <span class="Comment"># below all text</span>
type <span class="Constant">[e]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abc .</span>
<span class="Constant"> .de .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-6 [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
s:text <span class="Special"><-</span> new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
editor-render screen, e
<span class="Constant"> $clear-trace</span>
assume-console [
left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span> <span class="Comment"># below all text</span>
type <span class="Constant">[ef]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abc .</span>
<span class="Constant"> .def .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
check-trace-count-for-label<span class="Constant"> 2</span>, <span class="Constant">[print-character]</span>
]
<span class="muScenario">scenario</span> editor-moves-cursor-after-inserting-characters [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[ab]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
editor-render screen, e
assume-console [
type <span class="Constant">[01]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .01ab .</span>
<span class="Constant"> .╌╌╌╌╌ .</span>
<span class="Constant"> . .</span>
]
]
<span class="Comment"># if the cursor reaches the right margin, wrap the line</span>
<span class="muScenario">scenario</span> editor-wraps-line-on-insert [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
editor-render screen, e
<span class="Comment"># type a letter</span>
assume-console [
type <span class="Constant">[e]</span>
]
run [
editor-event-loop screen, console, e
]
<span class="Comment"># no wrap yet</span>
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .eabc .</span>
<span class="Constant"> .╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
]
<span class="Comment"># type a second letter</span>
assume-console [
type <span class="Constant">[f]</span>
]
run [
editor-event-loop screen, console, e
]
<span class="Comment"># now wrap</span>
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .efab↩.</span>
<span class="Constant"> .c .</span>
<span class="Constant"> .╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-wraps-line-on-insert-2 [
<span class="Constant">local-scope</span>
<span class="Comment"># create an editor with some text</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
s:text <span class="Special"><-</span> new <span class="Constant">[abcdefg</span>
<span class="Constant">defg]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
editor-render screen, e
<span class="Comment"># type more text at the start</span>
assume-console [
left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
type <span class="Constant">[abc]</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
<span class="Comment"># cursor is not wrapped</span>
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 3</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 3</span>
]
<span class="Comment"># but line is wrapped</span>
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abcd↩ .</span>
<span class="Constant"> .efg .</span>
<span class="Constant"> .abcd↩ .</span>
<span class="Constant"> .efg .</span>
]
]
<span class="muRecipe">after</span> <span class="Constant"><insert-character-special-case></span> [
<span class="Comment"># if the line wraps at the cursor, move cursor to start of next row</span>
<span class="Delimiter">{</span>
<span class="Comment"># if either:</span>
<span class="Comment"># a) we're at the end of the line and at the column of the wrap indicator, or</span>
<span class="Comment"># b) we're not at end of line and just before the column of the wrap indicator</span>
wrap-column:num <span class="Special"><-</span> copy right
before-wrap-column:num <span class="Special"><-</span> subtract wrap-column,<span class="Constant"> 1</span>
at-wrap?:bool <span class="Special"><-</span> greater-or-equal cursor-column, wrap-column
just-before-wrap?:bool <span class="Special"><-</span> greater-or-equal cursor-column, before-wrap-column
next:&:duplex-list:char <span class="Special"><-</span> next before-cursor
<span class="Comment"># at end of line? next == 0 || next.value == 10/newline</span>
at-end-of-line?:bool <span class="Special"><-</span> equal next,<span class="Constant"> 0</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> at-end-of-line?
next-character:char <span class="Special"><-</span> get *next, <span class="Constant">value:offset</span>
at-end-of-line? <span class="Special"><-</span> equal next-character, <span class="Constant">10/newline</span>
<span class="Delimiter">}</span>
<span class="Comment"># break unless ((eol? and at-wrap?) or (~eol? and just-before-wrap?))</span>
move-cursor-to-next-line?:bool <span class="Special"><-</span> copy <span class="Constant">0/false</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> at-end-of-line?
move-cursor-to-next-line? <span class="Special"><-</span> copy just-before-wrap?
<span class="Comment"># if we're moving the cursor because it's in the middle of a wrapping</span>
<span class="Comment"># line, adjust it to left-most column</span>
potential-new-cursor-column:num <span class="Special"><-</span> copy left
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> at-end-of-line?
move-cursor-to-next-line? <span class="Special"><-</span> copy at-wrap?
<span class="Comment"># if we're moving the cursor because it's at the end of a wrapping line,</span>
<span class="Comment"># adjust it to one past the left-most column to make room for the</span>
<span class="Comment"># newly-inserted wrap-indicator</span>
potential-new-cursor-column:num <span class="Special"><-</span> add left, <span class="Constant">1/make-room-for-wrap-indicator</span>
<span class="Delimiter">}</span>
<span class="muControl">break-unless</span> move-cursor-to-next-line?
cursor-column <span class="Special"><-</span> copy potential-new-cursor-column
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
cursor-row <span class="Special"><-</span> add cursor-row,<span class="Constant"> 1</span>
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
<span class="Comment"># if we're out of the screen, scroll down</span>
<span class="Delimiter">{</span>
below-screen?:bool <span class="Special"><-</span> greater-or-equal cursor-row, screen-height
<span class="muControl">break-unless</span> below-screen?
<span class="Constant"> <scroll-down></span>
<span class="Delimiter">}</span>
go-render? <span class="Special"><-</span> copy <span class="Constant">1/true</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
]
<span class="muScenario">scenario</span> editor-wraps-cursor-after-inserting-characters-in-middle-of-line [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abcde]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
assume-console [
left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span> <span class="Comment"># right before the wrap icon</span>
type <span class="Constant">[f]</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abcf↩ .</span>
<span class="Constant"> .de .</span>
<span class="Constant"> .╌╌╌╌╌ .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 2</span> <span class="Comment"># cursor row</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># cursor column</span>
]
]
<span class="muScenario">scenario</span> editor-wraps-cursor-after-inserting-characters-at-end-of-line [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
<span class="Comment"># create an editor containing two lines</span>
s:text <span class="Special"><-</span> new <span class="Constant">[abc</span>
<span class="Constant">xyz]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abc .</span>
<span class="Constant"> .xyz .</span>
<span class="Constant"> . .</span>
]
assume-console [
left-click<span class="Constant"> 1</span>,<span class="Constant"> 4</span> <span class="Comment"># at end of first line</span>
type <span class="Constant">[de]</span> <span class="Comment"># trigger wrap</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abcd↩ .</span>
<span class="Constant"> .e .</span>
<span class="Constant"> .xyz .</span>
<span class="Constant"> .╌╌╌╌╌ .</span>
]
]
<span class="muScenario">scenario</span> editor-wraps-cursor-to-left-margin [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abcde]</span>, screen, <span class="Constant">2/left</span>, <span class="Constant">7/right</span>
assume-console [
left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span> <span class="Comment"># line is full; no wrap icon yet</span>
type <span class="Constant">[01]</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> . abc0↩ .</span>
<span class="Constant"> . 1de .</span>
<span class="Constant"> . ╌╌╌╌╌ .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 2</span> <span class="Comment"># cursor row</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 3</span> <span class="Comment"># cursor column</span>
]
]
<span class="Comment"># if newline, move cursor to start of next line, and maybe align indent with previous line</span>
<span class="muData">container</span> editor [
indent?:bool
]
<span class="muRecipe">after</span> <span class="Constant"><editor-initialization></span> [
*result <span class="Special"><-</span> put *result, <span class="Constant">indent?:offset</span>, <span class="Constant">1/true</span>
]
<span class="muScenario">scenario</span> editor-moves-cursor-down-after-inserting-newline [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
assume-console [
type <span class="Constant">[0</span>
<span class="Constant">1]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .0 .</span>
<span class="Constant"> .1abc .</span>
<span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
]
<span class="muRecipe">after</span> <span class="Constant"><handle-special-character></span> [
<span class="Delimiter">{</span>
newline?:bool <span class="Special"><-</span> equal c, <span class="Constant">10/newline</span>
<span class="muControl">break-unless</span> newline?
<span class="Constant"> <insert-enter-begin></span>
editor <span class="Special"><-</span> insert-new-line-and-indent editor, screen
<span class="Constant"> <insert-enter-end></span>
go-render? <span class="Special"><-</span> copy <span class="Constant">1/true</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">def</span> insert-new-line-and-indent editor:&:editor, screen:&:screen<span class="muRecipe"> -> </span>editor:&:editor, screen:&:screen, go-render?:bool [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
cursor-row:num <span class="Special"><-</span> get *editor, <span class="Constant">cursor-row:offset</span>
cursor-column:num <span class="Special"><-</span> get *editor, <span class="Constant">cursor-column:offset</span>
before-cursor:&:duplex-list:char <span class="Special"><-</span> get *editor, <span class="Constant">before-cursor:offset</span>
left:num <span class="Special"><-</span> get *editor, <span class="Constant">left:offset</span>
right:num <span class="Special"><-</span> get *editor, <span class="Constant">right:offset</span>
screen-height:num <span class="Special"><-</span> screen-height screen
<span class="Comment"># insert newline</span>
insert <span class="Constant">10/newline</span>, before-cursor
before-cursor <span class="Special"><-</span> next before-cursor
*editor <span class="Special"><-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
cursor-row <span class="Special"><-</span> add cursor-row,<span class="Constant"> 1</span>
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
cursor-column <span class="Special"><-</span> copy left
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
<span class="Comment"># maybe scroll</span>
<span class="Delimiter">{</span>
below-screen?:bool <span class="Special"><-</span> greater-or-equal cursor-row, screen-height <span class="Comment"># must be equal, never greater</span>
<span class="muControl">break-unless</span> below-screen?
<span class="Constant"> <scroll-down></span>
go-render? <span class="Special"><-</span> copy <span class="Constant">1/true</span>
cursor-row <span class="Special"><-</span> subtract cursor-row,<span class="Constant"> 1</span> <span class="Comment"># bring back into screen range</span>
*editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
<span class="Delimiter">}</span>
<span class="Comment"># indent if necessary</span>
indent?:bool <span class="Special"><-</span> get *editor, <span class="Constant">indent?:offset</span>
<span class="muControl">return-unless</span> indent?
d:&:duplex-list:char <span class="Special"><-</span> get *editor, <span class="Constant">data:offset</span>
end-of-previous-line:&:duplex-list:char <span class="Special"><-</span> prev before-cursor
indent:num <span class="Special"><-</span> line-indent end-of-previous-line, d
i:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span class="Delimiter">{</span>
indent-done?:bool <span class="Special"><-</span> greater-or-equal i, indent
<span class="muControl">break-if</span> indent-done?
editor, screen, go-render?:bool <span class="Special"><-</span> insert-at-cursor editor, <span class="Constant">32/space</span>, screen
i <span class="Special"><-</span> add i,<span class="Constant"> 1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="Comment"># takes a pointer 'curr' into the doubly-linked list and its sentinel, counts</span>
<span class="Comment"># the number of spaces at the start of the line containing 'curr'.</span>
<span class="muRecipe">def</span> line-indent curr:&:duplex-list:char, start:&:duplex-list:char<span class="muRecipe"> -> </span>result:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span class="muControl">return-unless</span> curr
at-start?:bool <span class="Special"><-</span> equal curr, start
<span class="muControl">return-if</span> at-start?
<span class="Delimiter">{</span>
curr <span class="Special"><-</span> prev curr
<span class="muControl">break-unless</span> curr
at-start?:bool <span class="Special"><-</span> equal curr, start
<span class="muControl">break-if</span> at-start?
c:char <span class="Special"><-</span> get *curr, <span class="Constant">value:offset</span>
at-newline?:bool <span class="Special"><-</span> equal c, <span class="Constant">10/newline</span>
<span class="muControl">break-if</span> at-newline?
<span class="Comment"># if c is a space, increment result</span>
is-space?:bool <span class="Special"><-</span> equal c, <span class="Constant">32/space</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> is-space?
result <span class="Special"><-</span> add result,<span class="Constant"> 1</span>
<span class="Delimiter">}</span>
<span class="Comment"># if c is not a space, reset result</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> is-space?
result <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span class="Delimiter">}</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muScenario">scenario</span> editor-moves-cursor-down-after-inserting-newline-2 [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">1/left</span>, <span class="Constant">10/right</span>
assume-console [
type <span class="Constant">[0</span>
<span class="Constant">1]</span>
]
run [
editor-event-loop screen, console, e
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> . 0 .</span>
<span class="Constant"> . 1abc .</span>
<span class="Constant"> . ╌╌╌╌╌╌╌╌╌.</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-clears-previous-line-completely-after-inserting-newline [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
e:&:editor <span class="Special"><-</span> new-editor <span class="Constant">[abcde]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
assume-console [
press enter
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abcd↩ .</span>
<span class="Constant"> .e .</span>
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
]
run [
editor-event-loop screen, console, e
]
<span class="Comment"># line should be fully cleared</span>
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
<span class="Constant"> .abcd↩ .</span>
<span class="Constant"> .e .</span>
<span class="Constant"> .╌╌╌╌╌ .</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-indent-after-newline [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">10/height</span>
s:text <span class="Special"><-</span> new <span class="Constant">[ab</span>
<span class="Constant"> cd</span>
<span class="Constant">ef]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
<span class="Comment"># position cursor after 'cd' and hit 'newline'</span>
assume-console [
left-click<span class="Constant"> 2</span>,<span class="Constant"> 8</span>
type [
]
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
<span class="Comment"># cursor should be below start of previous line</span>
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 3</span> <span class="Comment"># cursor row</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 2</span> <span class="Comment"># cursor column (indented)</span>
]
]
<span class="muScenario">scenario</span> editor-skips-indent-around-paste [
<span class="Constant">local-scope</span>
assume-screen <span class="Constant">10/width</span>, <span class="Constant">10/height</span>
s:text <span class="Special"><-</span> new <span class="Constant">[ab</span>
<span class="Constant"> cd</span>
<span class="Constant">ef]</span>
e:&:editor <span class="Special"><-</span> new-editor s, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
<span class="Comment"># position cursor after 'cd' and hit 'newline' surrounded by paste markers</span>
assume-console [
left-click<span class="Constant"> 2</span>,<span class="Constant"> 8</span>
press<span class="Constant"> 65507</span> <span class="Comment"># start paste</span>
press enter
press<span class="Constant"> 65506</span> <span class="Comment"># end paste</span>
]
run [
editor-event-loop screen, console, e
3:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-row:offset</span>
4:num/<span class="Special">raw</span> <span class="Special"><-</span> get *e, <span class="Constant">cursor-column:offset</span>
]
<span class="Comment"># cursor should be below start of previous line</span>
memory-should-contain [
<span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 3</span> <span class="Comment"># cursor row</span>
<span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># cursor column (not indented)</span>
]
]
<span class="muRecipe">after</span> <span class="Constant"><handle-special-key></span> [
<span class="Delimiter">{</span>
paste-start?:bool <span class="Special"><-</span> equal k, <span class="Constant">65507/paste-start</span>
<span class="muControl">break-unless</span> paste-start?
*editor <span class="Special"><-</span> put *editor, <span class="Constant">indent?:offset</span>, <span class="Constant">0/false</span>
go-render? <span class="Special"><-</span> copy <span class="Constant">1/true</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">after</span> <span class="Constant"><handle-special-key></span> [
<span class="Delimiter">{</span>
paste-end?:bool <span class="Special"><-</span> equal k, <span class="Constant">65506/paste-end</span>
<span class="muControl">break-unless</span> paste-end?
*editor <span class="Special"><-</span> put *editor, <span class="Constant">indent?:offset</span>, <span class="Constant">1/true</span>
go-render? <span class="Special"><-</span> copy <span class="Constant">1/true</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
]
<span class="SalientComment">## helpers</span>
<span class="muRecipe">def</span> draw-horizontal screen:&:screen, row:num, x:num, right:num<span class="muRecipe"> -> </span>screen:&:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
style:char, style-found?:bool <span class="Special"><-</span> <span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> style-found?
style <span class="Special"><-</span> copy <span class="Constant">9472/horizontal</span>
<span class="Delimiter">}</span>
color:num, color-found?:bool <span class="Special"><-</span> <span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="Comment"># default color to white</span>
<span class="muControl">break-if</span> color-found?
color <span class="Special"><-</span> copy <span class="Constant">245/grey</span>
<span class="Delimiter">}</span>
bg-color:num, bg-color-found?:bool <span class="Special"><-</span> <span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> bg-color-found?
bg-color <span class="Special"><-</span> copy <span class="Constant">0/black</span>
<span class="Delimiter">}</span>
screen <span class="Special"><-</span> move-cursor screen, row, x
<span class="Delimiter">{</span>
continue?:bool <span class="Special"><-</span> lesser-or-equal x, right <span class="Comment"># right is inclusive, to match editor semantics</span>
<span class="muControl">break-unless</span> continue?
print screen, style, color, bg-color
x <span class="Special"><-</span> add x,<span class="Constant"> 1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
</pre>
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