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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Mu - edit.mu</title>
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<meta name="plugin-version" content="vim7.4_v1">
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<pre id='vimCodeElement'>
<span class="Comment"># Editor widget: takes a string and screen coordinates, modifying them in place.</span>
<span class="muRecipe">recipe</span> main [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
open-console
width:number<span class="Special"> <- </span>display-width
height:number<span class="Special"> <- </span>display-height
<span class="Comment"># draw a line</span>
divider:number, _<span class="Special"> <- </span>divide-with-remainder width:number, <span class="Constant">2:literal</span>
draw-vertical <span class="Constant">0:literal/screen</span>, divider:number, <span class="Constant">0:literal/top</span>, height:number
<span class="Comment"># editor on the left</span>
left:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcde]</span>
left-editor:address:editor-data<span class="Special"> <- </span>new-editor left:address:array:character, <span class="Constant">0:literal/screen</span>, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span> <span class="Comment">#divider:number/right</span>
<span class="Comment"># editor on the right</span>
right:address:array:character<span class="Special"> <- </span>new <span class="Constant">[def]</span>
new-left:number<span class="Special"> <- </span>add divider:number/right, <span class="Constant">1:literal</span>
right-editor:address:editor-data<span class="Special"> <- </span>new-editor right:address:array:character, <span class="Constant">0:literal/screen</span>, <span class="Constant">0:literal/top</span>, new-left:number, width:number
<span class="Comment"># chain</span>
x:address:address:editor-data<span class="Special"> <- </span>get-address left-editor:address:editor-data/deref, next-editor:offset
x:address:address:editor-data/deref<span class="Special"> <- </span>copy right-editor:address:editor-data
<span class="Comment"># initialize focus</span>
reset-focus left-editor:address:editor-data
cursor-row:number<span class="Special"> <- </span>get left-editor:address:editor-data/deref, cursor-row:offset
cursor-column:number<span class="Special"> <- </span>get left-editor:address:editor-data/deref, cursor-column:offset
move-cursor <span class="Constant">0:literal/screen</span>, cursor-row:number, cursor-column:number
<span class="Comment"># and we're off!</span>
event-loop <span class="Constant">0:literal/screen</span>, <span class="Constant">0:literal/events</span>, left-editor:address:editor-data
close-console
]
<span class="muScenario">scenario</span> editor-initially-prints-string-to-screen [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
run [
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> . .</span>
]
]
<span class="SalientComment">## In which we introduce the editor data structure, and show how it displays</span>
<span class="SalientComment">## text to the screen.</span>
container editor-data [
<span class="Comment"># doubly linked list of characters (head contains a special sentinel)</span>
data:address:duplex-list
<span class="Comment"># location of top-left of screen inside data (scrolling)</span>
top-of-screen:address:duplex-list
<span class="Comment"># location before cursor inside data</span>
before-cursor:address:duplex-list
screen:address:screen
<span class="Comment"># raw bounds of display area on screen</span>
top:number
left:number
bottom:number
right:number
<span class="Comment"># raw screen coordinates of cursor</span>
cursor-row:number
cursor-column:number
<span class="Comment"># pointer to another editor, responsible for a different area of screen.</span>
<span class="Comment"># helps organize editors in a 'chain'.</span>
next-editor:address:editor-data
in-focus?:boolean <span class="Comment"># set for the one editor in this chain currently being edited</span>
]
<span class="Comment"># editor:address, screen:address <- new-editor s:address:array:character, screen:address, top:number, left:number, bottom:number</span>
<span class="Comment"># creates a new editor widget and renders its initial appearance to screen.</span>
<span class="Comment"># top/left/right constrain the screen area available to the new editor.</span>
<span class="Comment"># right is exclusive.</span>
<span class="muRecipe">recipe</span> new-editor [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
s:address:array:character<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Comment"># no clipping of bounds</span>
top:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
left:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
right:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
right:number<span class="Special"> <- </span>subtract right:number, <span class="Constant">1:literal</span>
result:address:editor-data<span class="Special"> <- </span>new editor-data:type
<span class="Comment"># initialize screen-related fields</span>
sc:address:address:screen<span class="Special"> <- </span>get-address result:address:editor-data/deref, screen:offset
sc:address:address:screen/deref<span class="Special"> <- </span>copy screen:address
x:address:number<span class="Special"> <- </span>get-address result:address:editor-data/deref, top:offset
x:address:number/deref<span class="Special"> <- </span>copy top:number
x:address:number<span class="Special"> <- </span>get-address result:address:editor-data/deref, left:offset
x:address:number/deref<span class="Special"> <- </span>copy left:number
x:address:number<span class="Special"> <- </span>get-address result:address:editor-data/deref, right:offset
x:address:number/deref<span class="Special"> <- </span>copy right:number
<span class="Comment"># bottom = top (in case of early exit)</span>
x:address:number<span class="Special"> <- </span>get-address result:address:editor-data/deref, bottom:offset
x:address:number/deref<span class="Special"> <- </span>copy top:number
<span class="Comment"># initialize cursor</span>
x:address:number<span class="Special"> <- </span>get-address result:address:editor-data/deref, cursor-row:offset
x:address:number/deref<span class="Special"> <- </span>copy top:number
x:address:number<span class="Special"> <- </span>get-address result:address:editor-data/deref, cursor-column:offset
<span class="CommentedCode">#? $print left:number, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
x:address:number/deref<span class="Special"> <- </span>copy left:number
d:address:address:duplex-list<span class="Special"> <- </span>get-address result:address:editor-data/deref, data:offset
d:address:address:duplex-list/deref<span class="Special"> <- </span>push-duplex <span class="Constant">167:literal/§</span>, <span class="Constant">0:literal/tail</span>
y:address:address:duplex-list<span class="Special"> <- </span>get-address result:address:editor-data/deref, before-cursor:offset
y:address:address:duplex-list/deref<span class="Special"> <- </span>copy d:address:address:duplex-list/deref
init:address:address:duplex-list<span class="Special"> <- </span>get-address result:address:editor-data/deref, top-of-screen:offset
init:address:address:duplex-list/deref<span class="Special"> <- </span>copy d:address:address:duplex-list/deref
<span class="Comment"># set focus</span>
<span class="Comment"># if using multiple editors, must call reset-focus after chaining them all</span>
b:address:boolean<span class="Special"> <- </span>get-address result:address:editor-data/deref, in-focus?:offset
b:address:boolean/deref<span class="Special"> <- </span>copy <span class="Constant">1:literal/true</span>
<span class="CommentedCode">#? $print d:address:address:duplex-list/deref, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Comment"># early exit if s is empty</span>
<span class="muControl">reply-unless</span> s:address:array:character, result:address:editor-data
len:number<span class="Special"> <- </span>length s:address:array:character/deref
<span class="muControl">reply-unless</span> len:number, result:address:editor-data
idx:number<span class="Special"> <- </span>copy <span class="Constant">0:literal</span>
<span class="Comment"># now we can start appending the rest, character by character</span>
curr:address:duplex-list<span class="Special"> <- </span>copy init:address:address:duplex-list/deref
<span class="Delimiter">{</span>
<span class="CommentedCode">#? $print idx:number, [ vs ], len:number, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="CommentedCode">#? $print [append to ], curr:address:duplex-list, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal idx:number, len:number
<span class="muControl">break-if</span> done?:boolean
c:character<span class="Special"> <- </span>index s:address:array:character/deref, idx:number
<span class="CommentedCode">#? $print [aa: ], c:character, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
insert-duplex c:character, curr:address:duplex-list
<span class="Comment"># next iter</span>
curr:address:duplex-list<span class="Special"> <- </span>next-duplex curr:address:duplex-list
idx:number<span class="Special"> <- </span>add idx:number, <span class="Constant">1:literal</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># initialize cursor to top of screen</span>
y:address:address:duplex-list<span class="Special"> <- </span>get-address result:address:editor-data/deref, before-cursor:offset
y:address:address:duplex-list/deref<span class="Special"> <- </span>copy init:address:address:duplex-list/deref
<span class="Comment"># perform initial rendering to screen</span>
bottom:address:number<span class="Special"> <- </span>get-address result:address:editor-data/deref, bottom:offset
result:address:editor-data<span class="Special"> <- </span>render result:address:editor-data
<span class="muControl">reply</span> result:address:editor-data
]
<span class="muScenario">scenario</span> editor-initializes-without-data [
assume-screen <span class="Constant">5:literal/width</span>, <span class="Constant">3:literal/height</span>
run [
1:address:editor-data<span class="Special"> <- </span>new-editor <span class="Constant">0:literal/data</span>, screen:address, <span class="Constant">1:literal/top</span>, <span class="Constant">2:literal/left</span>, <span class="Constant">5:literal/right</span>
2:editor-data<span class="Special"> <- </span>copy 1:address:editor-data/deref
]
memory-should-contain [
<span class="Comment"># 2 <- just the § sentinel</span>
<span class="Comment"># 3 (top of screen) <- the § sentinel</span>
<span class="Comment"># 4 (before cursor) <- the § sentinel</span>
<span class="Comment"># 5 <- screen</span>
6<span class="Special"> <- </span>1 <span class="Comment"># top</span>
7<span class="Special"> <- </span>2 <span class="Comment"># left</span>
8<span class="Special"> <- </span>1 <span class="Comment"># bottom</span>
9<span class="Special"> <- </span>4 <span class="Comment"># right (inclusive)</span>
10<span class="Special"> <- </span>1 <span class="Comment"># cursor row</span>
11<span class="Special"> <- </span>2 <span class="Comment"># cursor column</span>
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
]
]
<span class="muRecipe">recipe</span> render [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">40:literal</span>
editor:address:editor-data<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="CommentedCode">#? $print [=== render</span>
<span class="CommentedCode">#? ] #? 2</span>
screen:address<span class="Special"> <- </span>get editor:address:editor-data/deref, screen:offset
top:number<span class="Special"> <- </span>get editor:address:editor-data/deref, top:offset
left:number<span class="Special"> <- </span>get editor:address:editor-data/deref, left:offset
screen-height:number<span class="Special"> <- </span>screen-height screen:address
right:number<span class="Special"> <- </span>get editor:address:editor-data/deref, right:offset
hide-screen screen:address
<span class="Comment"># traversing editor</span>
curr:address:duplex-list<span class="Special"> <- </span>get editor:address:editor-data/deref, top-of-screen:offset
prev:address:duplex-list<span class="Special"> <- </span>copy curr:address:duplex-list
curr:address:duplex-list<span class="Special"> <- </span>next-duplex curr:address:duplex-list
<span class="Comment"># traversing screen</span>
row:number<span class="Special"> <- </span>copy top:number
column:number<span class="Special"> <- </span>copy left:number
cursor-row:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-row:offset
cursor-column:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-column:offset
before-cursor:address:address:duplex-list<span class="Special"> <- </span>get-address editor:address:editor-data/deref, before-cursor:offset
move-cursor screen:address, row:number, column:number
<span class="Delimiter">{</span>
<span class="Constant"> +next-character</span>
<span class="CommentedCode">#? $print curr:address:duplex-list, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="muControl">break-unless</span> curr:address:duplex-list
off-screen?:boolean<span class="Special"> <- </span>greater-or-equal row:number, screen-height:number
<span class="muControl">break-if</span> off-screen?:boolean
<span class="Comment"># update editor-data.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?:boolean<span class="Special"> <- </span>equal row:number, cursor-row:address:number/deref
<span class="muControl">break-unless</span> at-cursor-row?:boolean
at-cursor?:boolean<span class="Special"> <- </span>equal column:number, cursor-column:address:number/deref
<span class="muControl">break-unless</span> at-cursor?:boolean
before-cursor:address:address:duplex-list/deref<span class="Special"> <- </span>prev-duplex curr:address:duplex-list
<span class="CommentedCode">#? new-prev:character <- get before-cursor:address:address:duplex-list/deref/deref, value:offset #? 1</span>
<span class="CommentedCode">#? $print [render 0: cursor adjusted to after ], new-prev:character, [(], cursor-row:address:number/deref, [, ], cursor-column:address:number/deref, [)</span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Delimiter">}</span>
c:character<span class="Special"> <- </span>get curr:address:duplex-list/deref, value:offset
<span class="CommentedCode">#? $print [rendering ], c:character, [ </span>
<span class="CommentedCode">#? ] #? 2</span>
<span class="Delimiter">{</span>
<span class="Comment"># newline? move to left rather than 0</span>
newline?:boolean<span class="Special"> <- </span>equal c:character, <span class="Constant">10:literal/newline</span>
<span class="muControl">break-unless</span> newline?:boolean
<span class="Comment"># adjust cursor if necessary</span>
<span class="Delimiter">{</span>
at-cursor-row?:boolean<span class="Special"> <- </span>equal row:number, cursor-row:address:number/deref
<span class="muControl">break-unless</span> at-cursor-row?:boolean
left-of-cursor?:boolean<span class="Special"> <- </span>lesser-than column:number, cursor-column:address:number/deref
<span class="muControl">break-unless</span> left-of-cursor?:boolean
cursor-column:address:number/deref<span class="Special"> <- </span>copy column:number
before-cursor:address:address:duplex-list/deref<span class="Special"> <- </span>prev-duplex curr:address:duplex-list
<span class="CommentedCode">#? new-prev:character <- get before-cursor:address:address:duplex-list/deref/deref, value:offset #? 1</span>
<span class="CommentedCode">#? $print [render 1: cursor adjusted to after ], new-prev:character, [(], cursor-row:address:number/deref, [, ], cursor-column:address:number/deref, [)</span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Delimiter">}</span>
<span class="Comment"># clear rest of line in this window</span>
<span class="CommentedCode">#? $print row:number, [ ], column:number, [ ], right:number, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-than column:number, right:number
<span class="muControl">break-if</span> done?:boolean
print-character screen:address, <span class="Constant">32:literal/space</span>
column:number<span class="Special"> <- </span>add column:number, <span class="Constant">1:literal</span>
<span class="CommentedCode">#? $print column:number, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># skip to next line</span>
row:number<span class="Special"> <- </span>add row:number, <span class="Constant">1:literal</span>
column:number<span class="Special"> <- </span>copy left:number
move-cursor screen:address, row:number, column:number
curr:address:duplex-list<span class="Special"> <- </span>next-duplex curr:address:duplex-list
prev:address:duplex-list<span class="Special"> <- </span>next-duplex prev:address:duplex-list
<span class="muControl">loop</span> <span class="Constant">+next-character:label</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
<span class="Comment"># at right? more than one letter left in the line? wrap</span>
at-right?:boolean<span class="Special"> <- </span>equal column:number, right:number
<span class="muControl">break-unless</span> at-right?:boolean
next-node:address:duplex-list<span class="Special"> <- </span>next-duplex curr:address:duplex-list
<span class="muControl">break-unless</span> next-node:address:duplex-list
next:character<span class="Special"> <- </span>get next-node:address:duplex-list/deref, value:offset
next-character-is-newline?:boolean<span class="Special"> <- </span>equal next:character, <span class="Constant">10:literal/newline</span>
<span class="muControl">break-if</span> next-character-is-newline?:boolean
<span class="Comment"># wrap</span>
print-character screen:address, <span class="Constant">8617:literal/loop-back-to-left</span>, <span class="Constant">245:literal/grey</span>
column:number<span class="Special"> <- </span>copy left:number
row:number<span class="Special"> <- </span>add row:number, <span class="Constant">1:literal</span>
move-cursor screen:address, row:number, column:number
<span class="Comment"># don't increment curr</span>
<span class="muControl">loop</span> <span class="Constant">+next-character:label</span>
<span class="Delimiter">}</span>
print-character screen:address, c:character
curr:address:duplex-list<span class="Special"> <- </span>next-duplex curr:address:duplex-list
prev:address:duplex-list<span class="Special"> <- </span>next-duplex prev:address:duplex-list
column:number<span class="Special"> <- </span>add column:number, <span class="Constant">1:literal</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># bottom = row</span>
bottom:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, bottom:offset
bottom:address:number/deref<span class="Special"> <- </span>copy row:number
<span class="Comment"># is cursor to the right of the last line? move to end</span>
<span class="Delimiter">{</span>
at-cursor-row?:boolean<span class="Special"> <- </span>equal row:number, cursor-row:address:number/deref
cursor-outside-line?:boolean<span class="Special"> <- </span>lesser-or-equal column:number, cursor-column:address:number/deref
before-cursor-on-same-line?:boolean<span class="Special"> <- </span>and at-cursor-row?:boolean, cursor-outside-line?:boolean
above-cursor-row?:boolean<span class="Special"> <- </span>lesser-than row:number, cursor-row:address:number/deref
before-cursor?:boolean<span class="Special"> <- </span>or before-cursor-on-same-line?:boolean, above-cursor-row?:boolean
<span class="muControl">break-unless</span> before-cursor?:boolean
<span class="CommentedCode">#? $print [pointed after all text</span>
<span class="CommentedCode">#? ] #? 1</span>
cursor-row:address:number/deref<span class="Special"> <- </span>copy row:number
cursor-column:address:number/deref<span class="Special"> <- </span>copy column:number
<span class="CommentedCode">#? $print [render: cursor moved to ], cursor-row:address:number/deref, [, ], cursor-column:address:number/deref, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Comment"># line not wrapped but cursor outside bounds? wrap cursor</span>
<span class="Delimiter">{</span>
too-far-right?:boolean<span class="Special"> <- </span>greater-than cursor-column:address:number/deref, right:number
<span class="muControl">break-unless</span> too-far-right?:boolean
cursor-column:address:number/deref<span class="Special"> <- </span>copy left:number
cursor-row:address:number/deref<span class="Special"> <- </span>add cursor-row:address:number/deref, <span class="Constant">1:literal</span>
above-screen-bottom?:boolean<span class="Special"> <- </span>lesser-than cursor-row:address:number/deref, screen-height:number
assert above-screen-bottom?:boolean, <span class="Constant">[unimplemented: wrapping cursor past bottom of screen]</span>
<span class="Delimiter">}</span>
<span class="CommentedCode">#? $print [now ], cursor-row:address:number/deref, [, ], cursor-column:address:number/deref, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
before-cursor:address:address:duplex-list/deref<span class="Special"> <- </span>copy prev:address:duplex-list
<span class="CommentedCode">#? new-prev:character <- get before-cursor:address:address:duplex-list/deref/deref, value:offset #? 1</span>
<span class="CommentedCode">#? $print [render Ω: cursor adjusted to after ], new-prev:character, [(], cursor-row:address:number/deref, [, ], cursor-column:address:number/deref, [)</span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Delimiter">}</span>
<span class="CommentedCode">#? $print [clearing ], row:number, [ ], column:number, [ ], right:number, [ </span>
<span class="CommentedCode">#? ] #? 2</span>
<span class="Delimiter">{</span>
<span class="Comment"># clear rest of current line</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal row:number, screen-height:number
<span class="muControl">break-if</span> done?:boolean
<span class="Delimiter">{</span>
line-done?:boolean<span class="Special"> <- </span>greater-than column:number, right:number
<span class="muControl">break-if</span> line-done?:boolean
print-character screen:address, <span class="Constant">32:literal/space</span>
column:number<span class="Special"> <- </span>add column:number, <span class="Constant">1:literal</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># clear one more line just in case we just backspaced out of it</span>
row:number<span class="Special"> <- </span>add row:number, <span class="Constant">1:literal</span>
column:number<span class="Special"> <- </span>copy left:number
done?:boolean<span class="Special"> <- </span>greater-or-equal row:number, screen-height:number
<span class="muControl">break-if</span> done?:boolean
move-cursor screen:address, row:number, column:number
<span class="Delimiter">{</span>
line-done?:boolean<span class="Special"> <- </span>greater-or-equal column:number, right:number
<span class="muControl">break-if</span> line-done?:boolean
print-character screen:address, <span class="Constant">32:literal/space</span>
column:number<span class="Special"> <- </span>add column:number, <span class="Constant">1:literal</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment"># update cursor</span>
<span class="Delimiter">{</span>
in-focus?:boolean<span class="Special"> <- </span>get editor:address:editor-data/deref, in-focus?:offset
<span class="muControl">break-unless</span> in-focus?:boolean
cursor-inside-right-margin?:boolean<span class="Special"> <- </span>lesser-or-equal cursor-column:address:number/deref, right:number
assert cursor-inside-right-margin?:boolean, <span class="Constant">[cursor outside right margin]</span>
cursor-inside-left-margin?:boolean<span class="Special"> <- </span>greater-or-equal cursor-column:address:number/deref, left:number
assert cursor-inside-left-margin?:boolean, <span class="Constant">[cursor outside left margin]</span>
move-cursor screen:address, cursor-row:address:number/deref, cursor-column:address:number/deref
<span class="Delimiter">}</span>
show-screen screen:address
<span class="muControl">reply</span> editor:address:editor-data/same-as-ingredient:0
]
<span class="muScenario">scenario</span> editor-initially-prints-multiple-lines [
assume-screen <span class="Constant">5:literal/width</span>, <span class="Constant">3:literal/height</span>
run [
s:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">def]</span>
new-editor s:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> .def .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-initially-handles-offsets [
assume-screen <span class="Constant">5:literal/width</span>, <span class="Constant">3:literal/height</span>
run [
s:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
new-editor s:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">1:literal/left</span>, <span class="Constant">5:literal/right</span>
]
screen-should-contain [
<span class="Constant"> . abc .</span>
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-initially-prints-multiple-lines-at-offset [
assume-screen <span class="Constant">5:literal/width</span>, <span class="Constant">3:literal/height</span>
run [
s:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">def]</span>
new-editor s:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">1:literal/left</span>, <span class="Constant">5:literal/right</span>
]
screen-should-contain [
<span class="Constant"> . abc .</span>
<span class="Constant"> . def .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-initially-wraps-long-lines [
assume-screen <span class="Constant">5:literal/width</span>, <span class="Constant">3:literal/height</span>
run [
s:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc def]</span>
new-editor s:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
]
screen-should-contain [
<span class="Constant"> .abc ↩.</span>
<span class="Constant"> .def .</span>
<span class="Constant"> . .</span>
]
screen-should-contain-in-color, <span class="Constant">245:literal/grey</span> [
<span class="Constant"> . ↩.</span>
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-initializes-empty-text [
assume-screen <span class="Constant">5:literal/width</span>, <span class="Constant">3:literal/height</span>
run [
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
3<span class="Special"> <- </span>0 <span class="Comment"># cursor row</span>
4<span class="Special"> <- </span>0 <span class="Comment"># cursor column</span>
]
]
<span class="SalientComment">## handling events from the keyboard, mouse, touch screen, ...</span>
<span class="Comment"># Takes a chain of editors (chained using editor-data.next-editor), sends each</span>
<span class="Comment"># event from the console to each editor.</span>
<span class="muRecipe">recipe</span> event-loop [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
console:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
editor:address:editor-data<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="Comment"># send each event to each editor</span>
e:event, console:address, found?:boolean, quit?:boolean<span class="Special"> <- </span>read-event console:address
<span class="muControl">loop-unless</span> found?:boolean
<span class="muControl">break-if</span> quit?:boolean <span class="Comment"># only in tests</span>
trace <span class="Constant">[app]</span>, <span class="Constant">[next-event]</span>
<span class="CommentedCode">#? $print [--- new event</span>
<span class="CommentedCode">#? ] #? 1</span>
curr:address:editor-data<span class="Special"> <- </span>copy editor:address:editor-data
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> curr:address:editor-data
handle-event screen:address, console:address, curr:address:editor-data, e:event
curr:address:editor-data<span class="Special"> <- </span>get curr:address:editor-data/deref, next-editor:offset
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># after each non-trivial event, render all editors</span>
curr:address:editor-data<span class="Special"> <- </span>copy editor:address:editor-data
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> curr:address:editor-data
render curr:address:editor-data
curr:address:editor-data<span class="Special"> <- </span>get curr:address:editor-data/deref, next-editor:offset
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># ..and position the cursor</span>
curr:address:editor-data<span class="Special"> <- </span>copy editor:address:editor-data
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> curr:address:editor-data
<span class="Delimiter">{</span>
in-focus?:boolean<span class="Special"> <- </span>get curr:address:editor-data/deref, in-focus?:offset
<span class="muControl">break-unless</span> in-focus?:boolean
cursor-row:number<span class="Special"> <- </span>get curr:address:editor-data/deref, cursor-row:offset
cursor-column:number<span class="Special"> <- </span>get curr:address:editor-data/deref, cursor-column:offset
move-cursor screen:address, cursor-row:number, cursor-column:number
<span class="Delimiter">}</span>
curr:address:editor-data<span class="Special"> <- </span>get curr:address:editor-data/deref, next-editor:offset
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">recipe</span> handle-event [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">50:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
console:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
editor:address:editor-data<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
e:event<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Comment"># 'touch' event</span>
<span class="Delimiter">{</span>
t:address:touch-event<span class="Special"> <- </span>maybe-convert e:event, touch:variant
<span class="muControl">break-unless</span> t:address:touch-event
move-cursor-in-editor editor:address:editor-data, t:address:touch-event/deref
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># other events trigger only if this editor is in focus</span>
<span class="CommentedCode">#? $print [checking ], editor:address:editor-data, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="CommentedCode">#? x:address:boolean <- get-address editor:address:editor-data/deref, in-focus?:offset #? 1</span>
<span class="CommentedCode">#? $print [address of focus: ], x:address:boolean, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
in-focus?:address:boolean<span class="Special"> <- </span>get-address editor:address:editor-data/deref, in-focus?:offset
<span class="CommentedCode">#? $print [ at ], in-focus?:address:boolean, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="muControl">reply-unless</span> in-focus?:address:boolean/deref
<span class="CommentedCode">#? $print [in focus: ], editor:address:editor-data, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Comment"># typing a character</span>
<span class="Delimiter">{</span>
c:address:character<span class="Special"> <- </span>maybe-convert e:event, text:variant
<span class="muControl">break-unless</span> c:address:character
<span class="Comment"># unless it's a backspace</span>
<span class="Delimiter">{</span>
backspace?:boolean<span class="Special"> <- </span>equal c:address:character/deref, <span class="Constant">8:literal/backspace</span>
<span class="muControl">break-unless</span> backspace?:boolean
delete-before-cursor editor:address:editor-data
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
insert-at-cursor editor:address:editor-data, c:address:character/deref
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise it's a special key to control the editor</span>
k:address:number<span class="Special"> <- </span>maybe-convert e:event, keycode:variant
assert k:address:number, <span class="Constant">[event was of unknown type; neither keyboard nor mouse]</span>
d:address:duplex-list<span class="Special"> <- </span>get editor:address:editor-data/deref, data:offset
before-cursor:address:address:duplex-list<span class="Special"> <- </span>get-address editor:address:editor-data/deref, before-cursor:offset
cursor-row:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-row:offset
cursor-column:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-column:offset
screen-height:number<span class="Special"> <- </span>screen-height screen:address
top:number<span class="Special"> <- </span>get editor:address:editor-data/deref, top:offset
<span class="Comment"># arrows; update cursor-row and cursor-column, leave before-cursor to 'render'.</span>
<span class="Comment"># right arrow</span>
<span class="Delimiter">{</span>
move-to-next-character?:boolean<span class="Special"> <- </span>equal k:address:number/deref, <span class="Constant">65514:literal/right-arrow</span>
<span class="muControl">break-unless</span> move-to-next-character?:boolean
<span class="Comment"># if not at end of text</span>
old-cursor:address:duplex-list<span class="Special"> <- </span>next-duplex before-cursor:address:address:duplex-list/deref
<span class="muControl">break-unless</span> old-cursor:address:duplex-list
<span class="Comment"># scan to next character</span>
before-cursor:address:address:duplex-list/deref<span class="Special"> <- </span>copy old-cursor:address:duplex-list
<span class="Comment"># if crossed a newline, move cursor to start of next row</span>
<span class="Delimiter">{</span>
old-cursor-character:character<span class="Special"> <- </span>get before-cursor:address:address:duplex-list/deref/deref, value:offset
was-at-newline?:boolean<span class="Special"> <- </span>equal old-cursor-character:character, <span class="Constant">10:literal/newline</span>
<span class="muControl">break-unless</span> was-at-newline?:boolean
cursor-row:address:number/deref<span class="Special"> <- </span>add cursor-row:address:number/deref, <span class="Constant">1:literal</span>
cursor-column:address:number/deref<span class="Special"> <- </span>copy <span class="Constant">0:literal</span>
<span class="Comment"># todo: what happens when cursor is too far down?</span>
screen-height:number<span class="Special"> <- </span>screen-height screen:address
above-screen-bottom?:boolean<span class="Special"> <- </span>lesser-than cursor-row:address:number/deref, screen-height:number
assert above-screen-bottom?:boolean, <span class="Constant">[unimplemented: moving past bottom of screen]</span>
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># if the line wraps, move cursor to start of next row</span>
<span class="Delimiter">{</span>
<span class="Comment"># if we're at the column just before the wrap indicator</span>
right:number<span class="Special"> <- </span>get editor:address:editor-data/deref, right:offset
wrap-column:number<span class="Special"> <- </span>subtract right:number, <span class="Constant">1:literal</span>
at-wrap?:boolean<span class="Special"> <- </span>equal cursor-column:address:number/deref, wrap-column:number
<span class="muControl">break-unless</span> at-wrap?:boolean
<span class="Comment"># and if character after next isn't newline</span>
<span class="CommentedCode">#? $print [aaa] #? 1</span>
new-cursor:address:duplex-list<span class="Special"> <- </span>next-duplex old-cursor:address:duplex-list
<span class="muControl">break-unless</span> new-cursor:address:duplex-list
next:address:duplex-list<span class="Special"> <- </span>next-duplex new-cursor:address:duplex-list
<span class="muControl">break-unless</span> next:address:duplex-list
next-character:character<span class="Special"> <- </span>get next:address:duplex-list/deref, value:offset
newline?:boolean<span class="Special"> <- </span>equal next-character:character, <span class="Constant">10:literal/newline</span>
<span class="muControl">break-if</span> newline?:boolean
cursor-row:address:number/deref<span class="Special"> <- </span>add cursor-row:address:number/deref, <span class="Constant">1:literal</span>
cursor-column:address:number/deref<span class="Special"> <- </span>copy <span class="Constant">0:literal</span>
<span class="Comment"># todo: what happens when cursor is too far down?</span>
above-screen-bottom?:boolean<span class="Special"> <- </span>lesser-than cursor-row:address:number/deref, screen-height:number
assert above-screen-bottom?:boolean, <span class="Constant">[unimplemented: moving past bottom of screen]</span>
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise move cursor one character right</span>
cursor-column:address:number/deref<span class="Special"> <- </span>add cursor-column:address:number/deref, <span class="Constant">1:literal</span>
<span class="Delimiter">}</span>
<span class="Comment"># left arrow</span>
<span class="Delimiter">{</span>
move-to-previous-character?:boolean<span class="Special"> <- </span>equal k:address:number/deref, <span class="Constant">65515:literal/left-arrow</span>
<span class="muControl">break-unless</span> move-to-previous-character?:boolean
<span class="Comment"># if not at start of text (before-cursor at § sentinel)</span>
prev:address:duplex-list<span class="Special"> <- </span>prev-duplex before-cursor:address:address:duplex-list/deref
<span class="muControl">break-unless</span> prev:address:duplex-list
<span class="Comment"># if cursor not at left margin, move one character left</span>
<span class="Delimiter">{</span>
at-left-margin?:boolean<span class="Special"> <- </span>equal cursor-column:address:number/deref, <span class="Constant">0:literal</span>
<span class="muControl">break-if</span> at-left-margin?:boolean
cursor-column:address:number/deref<span class="Special"> <- </span>subtract cursor-column:address:number/deref, <span class="Constant">1:literal</span>
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># if at left margin, there's guaranteed to be a previous line, since we're</span>
<span class="Comment"># not at start of text</span>
<span class="Delimiter">{</span>
<span class="Comment"># if before-cursor is at newline, figure out how long the previous line is</span>
prevc:character<span class="Special"> <- </span>get before-cursor:address:address:duplex-list/deref/deref, value:offset
previous-character-is-newline?:boolean<span class="Special"> <- </span>equal prevc:character, <span class="Constant">10:literal/newline</span>
<span class="muControl">break-unless</span> previous-character-is-newline?:boolean
<span class="Comment"># compute length of previous line</span>
end-of-line:number<span class="Special"> <- </span>previous-line-length before-cursor:address:address:duplex-list/deref, d:address:duplex-list
cursor-row:address:number/deref<span class="Special"> <- </span>subtract cursor-row:address:number/deref, <span class="Constant">1:literal</span>
cursor-column:address:number/deref<span class="Special"> <- </span>copy end-of-line:number
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># if before-cursor is not at newline, we're just at a wrapped line</span>
assert cursor-row:address:number/deref, <span class="Constant">[unimplemented: moving cursor above top of screen]</span>
cursor-row:address:number/deref<span class="Special"> <- </span>subtract cursor-row:address:number/deref, <span class="Constant">1:literal</span>
right:number<span class="Special"> <- </span>get editor:address:editor-data/deref, right:offset
cursor-column:address:number/deref<span class="Special"> <- </span>subtract right:number, <span class="Constant">1:literal</span> <span class="Comment"># leave room for wrap icon</span>
<span class="Delimiter">}</span>
<span class="Comment"># down arrow</span>
<span class="Delimiter">{</span>
move-to-next-line?:boolean<span class="Special"> <- </span>equal k:address:number/deref, <span class="Constant">65516:literal/down-arrow</span>
<span class="muControl">break-unless</span> move-to-next-line?:boolean
<span class="Comment"># todo: support scrolling</span>
already-at-bottom?:boolean<span class="Special"> <- </span>greater-or-equal cursor-row:address:number/deref, screen-height:number
<span class="muControl">break-if</span> already-at-bottom?:boolean
<span class="CommentedCode">#? $print [moving down</span>
<span class="CommentedCode">#? ] #? 1</span>
cursor-row:address:number/deref<span class="Special"> <- </span>add cursor-row:address:number/deref, <span class="Constant">1:literal</span>
<span class="Comment"># that's it; render will adjust cursor-column as necessary</span>
<span class="Delimiter">}</span>
<span class="Comment"># up arrow</span>
<span class="Delimiter">{</span>
move-to-previous-line?:boolean<span class="Special"> <- </span>equal k:address:number/deref, <span class="Constant">65517:literal/up-arrow</span>
<span class="muControl">break-unless</span> move-to-previous-line?:boolean
<span class="Comment"># todo: support scrolling</span>
already-at-top?:boolean<span class="Special"> <- </span>lesser-or-equal cursor-row:address:number/deref, top:number
<span class="muControl">break-if</span> already-at-top?:boolean
<span class="CommentedCode">#? $print [moving up</span>
<span class="CommentedCode">#? ] #? 1</span>
cursor-row:address:number/deref<span class="Special"> <- </span>subtract cursor-row:address:number/deref, <span class="Constant">1:literal</span>
<span class="Comment"># that's it; render will adjust cursor-column as necessary</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">recipe</span> move-cursor-in-editor [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
editor:address:editor-data<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
t:touch-event<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Comment"># always reset focus to start</span>
in-focus?:address:boolean<span class="Special"> <- </span>get-address editor:address:editor-data/deref, in-focus?:offset
in-focus?:address:boolean/deref<span class="Special"> <- </span>copy <span class="Constant">0:literal/true</span>
click-column:number<span class="Special"> <- </span>get t:touch-event, column:offset
left:number<span class="Special"> <- </span>get editor:address:editor-data/deref, left:offset
too-far-left?:boolean<span class="Special"> <- </span>lesser-than click-column:number, left:number
<span class="muControl">reply-if</span> too-far-left?:boolean
right:number<span class="Special"> <- </span>get editor:address:editor-data/deref, right:offset
too-far-right?:boolean<span class="Special"> <- </span>greater-than click-column:number, right:number
<span class="muControl">reply-if</span> too-far-right?:boolean
<span class="CommentedCode">#? $print [focus now at ], editor:address:editor-data, [ </span>
<span class="CommentedCode">#? ] #? 2</span>
<span class="Comment"># click on this window; gain focus</span>
in-focus?:address:boolean/deref<span class="Special"> <- </span>copy <span class="Constant">1:literal/true</span>
<span class="Comment"># update cursor</span>
cursor-row:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-row:offset
cursor-row:address:number/deref<span class="Special"> <- </span>get t:touch-event, row:offset
cursor-column:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-column:offset
cursor-column:address:number/deref<span class="Special"> <- </span>get t:touch-event, column:offset
<span class="CommentedCode">#? $print [column is at: ], cursor-column:address:number, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
]
<span class="muRecipe">recipe</span> insert-at-cursor [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
editor:address:editor-data<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
c:character<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="CommentedCode">#? $print [insert ], c:character, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
before-cursor:address:address:duplex-list<span class="Special"> <- </span>get-address editor:address:editor-data/deref, before-cursor:offset
d:address:duplex-list<span class="Special"> <- </span>get editor:address:editor-data/deref, data:offset
insert-duplex c:character, before-cursor:address:address:duplex-list/deref
screen:address<span class="Special"> <- </span>get editor:address:editor-data/deref, screen:offset
cursor-row:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-row:offset
cursor-column:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-column:offset
<span class="Comment"># update cursor: if newline, move cursor to start of next line</span>
<span class="Comment"># todo: bottom of screen</span>
<span class="Delimiter">{</span>
newline?:boolean<span class="Special"> <- </span>equal c:character, <span class="Constant">10:literal/newline</span>
<span class="muControl">break-unless</span> newline?:boolean
cursor-row:address:number/deref<span class="Special"> <- </span>add cursor-row:address:number/deref, <span class="Constant">1:literal</span>
cursor-column:address:number/deref<span class="Special"> <- </span>copy <span class="Constant">0:literal</span>
<span class="muControl">reply</span>
<span class="Delimiter">}</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 we're at the column just before the wrap indicator</span>
right:number<span class="Special"> <- </span>get editor:address:editor-data/deref, right:offset
wrap-column:number<span class="Special"> <- </span>subtract right:number, <span class="Constant">1:literal</span>
<span class="CommentedCode">#? $print [wrap? ], cursor-column:address:number/deref, [ vs ], wrap-column:number, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
at-wrap?:boolean<span class="Special"> <- </span>greater-or-equal cursor-column:address:number/deref, wrap-column:number
<span class="muControl">break-unless</span> at-wrap?:boolean
<span class="CommentedCode">#? $print [wrap!</span>
<span class="CommentedCode">#? ] #? 1</span>
cursor-column:address:number/deref<span class="Special"> <- </span>subtract cursor-column:address:number/deref, wrap-column:number
cursor-row:address:number/deref<span class="Special"> <- </span>add cursor-row:address:number/deref, <span class="Constant">1:literal</span>
<span class="Comment"># todo: what happens when cursor is too far down?</span>
screen-height:number<span class="Special"> <- </span>screen-height screen:address
above-screen-bottom?:boolean<span class="Special"> <- </span>lesser-than cursor-row:address:number/deref, screen-height:number
assert above-screen-bottom?:boolean, <span class="Constant">[unimplemented: typing past bottom of screen]</span>
<span class="CommentedCode">#? $print [return</span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise move cursor right</span>
cursor-column:address:number/deref<span class="Special"> <- </span>add cursor-column:address:number/deref, <span class="Constant">1:literal</span>
]
<span class="muRecipe">recipe</span> delete-before-cursor [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
editor:address:editor-data<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
before-cursor:address:address:duplex-list<span class="Special"> <- </span>get-address editor:address:editor-data/deref, before-cursor:offset
d:address:duplex-list<span class="Special"> <- </span>get editor:address:editor-data/deref, data:offset
<span class="Comment"># unless already at start</span>
at-start?:boolean<span class="Special"> <- </span>equal before-cursor:address:address:duplex-list/deref, d:address:duplex-list
<span class="muControl">reply-if</span> at-start?:boolean
<span class="Comment"># delete character</span>
prev:address:duplex-list<span class="Special"> <- </span>prev-duplex before-cursor:address:address:duplex-list/deref
remove-duplex before-cursor:address:address:duplex-list/deref
<span class="Comment"># update cursor</span>
before-cursor:address:address:duplex-list/deref<span class="Special"> <- </span>copy prev:address:duplex-list
cursor-column:address:number<span class="Special"> <- </span>get-address editor:address:editor-data/deref, cursor-column:offset
cursor-column:address:number/deref<span class="Special"> <- </span>subtract cursor-column:address:number/deref, <span class="Constant">1:literal</span>
<span class="CommentedCode">#? $print [delete-before-cursor: ], cursor-column:address:number/deref, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
]
<span class="Comment"># takes a pointer 'curr' into the doubly-linked list and its sentinel, counts</span>
<span class="Comment"># the length of the previous line before the 'curr' pointer.</span>
<span class="muRecipe">recipe</span> previous-line-length [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
curr:address:duplex-list<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
start:address:duplex-list<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
result:number<span class="Special"> <- </span>copy <span class="Constant">0:literal</span>
<span class="muControl">reply-unless</span> curr:address:duplex-list, result:number
at-start?:boolean<span class="Special"> <- </span>equal curr:address:duplex-list, start:address:duplex-list
<span class="muControl">reply-if</span> at-start?:boolean, result:number
<span class="Delimiter">{</span>
curr:address:duplex-list<span class="Special"> <- </span>prev-duplex curr:address:duplex-list
<span class="muControl">break-unless</span> curr:address:duplex-list
at-start?:boolean<span class="Special"> <- </span>equal curr:address:duplex-list, start:address:duplex-list
<span class="muControl">break-if</span> at-start?:boolean
c:character<span class="Special"> <- </span>get curr:address:duplex-list/deref, value:offset
at-newline?:boolean<span class="Special"> <- </span>equal c:character <span class="Constant">10:literal/newline</span>
<span class="muControl">break-if</span> at-newline?:boolean
result:number<span class="Special"> <- </span>add result:number, <span class="Constant">1:literal</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="muControl">reply</span> result:number
]
<span class="muScenario">scenario</span> editor-handles-empty-event-queue [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="CommentedCode">#? 3:number <- get screen:address/deref, num-rows:offset #? 1</span>
<span class="CommentedCode">#? $print [0: ], screen:address, [: ], 3:number, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
<span class="CommentedCode">#? $print [1: ], screen:address, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console <span class="Constant">[]</span>
<span class="CommentedCode">#? $print [8: ], screen:address, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
run [
event-loop screen:address, console:address, 2:address:editor-data
]
<span class="CommentedCode">#? $print [9: ], screen:address, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 0, 1 <span class="Comment"># on the 'b'</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
3<span class="Special"> <- </span>0 <span class="Comment"># cursor is at row 0..</span>
4<span class="Special"> <- </span>1 <span class="Comment"># ..and column 1</span>
]
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 0, 7 <span class="Comment"># last line, to the right of text</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>0 <span class="Comment"># cursor row</span>
4<span class="Special"> <- </span>3 <span class="Comment"># cursor column</span>
]
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text-2 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">def]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 0, 7 <span class="Comment"># interior line, to the right of text</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>0 <span class="Comment"># cursor row</span>
4<span class="Special"> <- </span>3 <span class="Comment"># cursor column</span>
]
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text-3 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">def]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 2, 7 <span class="Comment"># below text</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>1 <span class="Comment"># cursor row</span>
4<span class="Special"> <- </span>3 <span class="Comment"># cursor column</span>
]
]
<span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-column [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
<span class="Comment"># editor occupies only left half of screen</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
<span class="Comment"># click on right half of screen</span>
left-click 3, 8
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
3<span class="Special"> <- </span>0 <span class="Comment"># no change to cursor row</span>
4<span class="Special"> <- </span>0 <span class="Comment"># ..or column</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-characters-into-empty-editor [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
type <span class="Constant">[abc]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
type <span class="Constant">[0]</span>
left-click 0, 2
type <span class="Constant">[d]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .0adbc .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-2 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 0, 5 <span class="Comment"># right of last line</span>
type <span class="Constant">[d]</span> <span class="Comment"># should append</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abcd .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-3 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 3, 5 <span class="Comment"># below all text</span>
type <span class="Constant">[d]</span> <span class="Comment"># should append</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abcd .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-4 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 3, 5 <span class="Comment"># below all text</span>
type <span class="Constant">[e]</span> <span class="Comment"># should append</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> .de .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-5 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 3, 5 <span class="Comment"># below all text</span>
type <span class="Constant">[ef]</span> <span class="Comment"># should append multiple characters in order</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> .def .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-6 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># text fills line</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcde]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
<span class="Comment"># position cursor at end</span>
assume-console [
left-click 3, 0
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
<span class="Comment"># text shouldn't wrap</span>
screen-should-contain [
<span class="Constant"> .abcde .</span>
<span class="Constant"> . .</span>
]
<span class="Comment"># cursor should wrap</span>
memory-should-contain [
3<span class="Special"> <- </span>1
4<span class="Special"> <- </span>0
]
]
<span class="muScenario">scenario</span> editor-wraps-line-on-insert [
assume-screen <span class="Constant">5:literal/width</span>, <span class="Constant">3:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcd]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
<span class="Comment"># type a letter</span>
assume-console [
type <span class="Constant">[e]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
<span class="Comment"># no wrap yet</span>
screen-should-contain [
<span class="Constant"> .eabcd.</span>
<span class="Constant"> . .</span>
]
<span class="Comment"># type a second letter</span>
assume-console [
type <span class="Constant">[f]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
<span class="Comment"># now wrap</span>
screen-should-contain [
<span class="Constant"> .efab↩.</span>
<span class="Constant"> .cd .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-after-inserting-characters [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
type <span class="Constant">[01]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .01abc .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-wraps-cursor-after-inserting-characters [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcde]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
left-click 0, 4 <span class="Comment"># line is full; no wrap icon yet</span>
type <span class="Constant">[f]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
screen-should-contain [
<span class="Constant"> .abcd↩ .</span>
<span class="Constant"> .fe .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
3<span class="Special"> <- </span>1 <span class="Comment"># cursor row</span>
4<span class="Special"> <- </span>1 <span class="Comment"># cursor column</span>
]
]
<span class="muScenario">scenario</span> editor-wraps-cursor-after-inserting-characters-2 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcde]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
left-click 0, 3 <span class="Comment"># right before the wrap icon</span>
type <span class="Constant">[f]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
screen-should-contain [
<span class="Constant"> .abcf↩ .</span>
<span class="Constant"> .de .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
3<span class="Special"> <- </span>1 <span class="Comment"># cursor row</span>
4<span class="Special"> <- </span>0 <span class="Comment"># cursor column</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-down-after-inserting-newline [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
type <span class="Constant">[0</span>
<span class="Constant">1]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .0 .</span>
<span class="Constant"> .1abc .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-clears-previous-line-completely-after-inserting-newline [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcde]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
<span class="Comment"># press just a 'newline'</span>
assume-console [
type [
]
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
<span class="Comment"># line should be fully cleared</span>
screen-should-contain [
<span class="Constant"> . .</span>
<span class="Constant"> .abcde .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-handles-backspace-key [
<span class="CommentedCode">#? $print [=== new test</span>
<span class="CommentedCode">#? ] #? 1</span>
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
<span class="CommentedCode">#? $print [editor: ], 2:address:editor-data, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
assume-console [
left-click 0, 1
type <span class="Constant">[«]</span>
]
3:event/backspace<span class="Special"> <- </span>merge <span class="Constant">0:literal/text</span>, <span class="Constant">8:literal/backspace</span>, <span class="Constant">0:literal/dummy</span>, <span class="Constant">0:literal/dummy</span>
replace-in-console <span class="Constant">171:literal/«</span>, 3:event/backspace
run [
event-loop screen:address, console:address, 2:address:editor-data
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
5:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
screen-should-contain [
<span class="Constant"> .bc .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
4<span class="Special"> <- </span>0
5<span class="Special"> <- </span>0
]
]
<span class="muScenario">scenario</span> editor-clears-last-line-on-backspace [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># just one character in final line</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
left-click 1, 0 <span class="Comment"># cursor at only character in final line</span>
type <span class="Constant">[«]</span>
]
3:event/backspace<span class="Special"> <- </span>merge <span class="Constant">0:literal/text</span>, <span class="Constant">8:literal/backspace</span>, <span class="Constant">0:literal/dummy</span>, <span class="Constant">0:literal/dummy</span>
replace-in-console <span class="Constant">171:literal/«</span>, 3:event/backspace
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abcd .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-handles-backspace-key-at-right-margin [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># fill a line with text</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcde]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
<span class="Comment"># position cursor at end</span>
assume-console [
left-click 1, 3 <span class="Comment"># at end of text</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
<span class="Comment"># check that cursor wraps to next line</span>
memory-should-contain [
3<span class="Special"> <- </span>1
4<span class="Special"> <- </span>0
]
<span class="Comment"># now hit a backspace key</span>
assume-console [
type <span class="Constant">[«]</span>
]
5:event/backspace<span class="Special"> <- </span>merge <span class="Constant">0:literal/text</span>, <span class="Constant">8:literal/backspace</span>, <span class="Constant">0:literal/dummy</span>, <span class="Constant">0:literal/dummy</span>
replace-in-console <span class="Constant">171:literal/«</span>, 5:event/backspace
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
<span class="Comment"># cursor unwraps</span>
memory-should-contain [
3<span class="Special"> <- </span>0
4<span class="Special"> <- </span>4
]
screen-should-contain [
<span class="Constant"> .abcd .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-right-with-key [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
press 65514 <span class="Comment"># right arrow</span>
type <span class="Constant">[0]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .a0bc .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-to-next-line-with-right-arrow [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
press 65514 <span class="Comment"># right arrow</span>
press 65514 <span class="Comment"># right arrow</span>
press 65514 <span class="Comment"># right arrow</span>
press 65514 <span class="Comment"># right arrow - next line</span>
type <span class="Constant">[0]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> .0d .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-to-next-wrapped-line-with-right-arrow [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcdef]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
left-click 0, 3
press 65514 <span class="Comment"># right arrow</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
screen-should-contain [
<span class="Constant"> .abcd↩ .</span>
<span class="Constant"> .ef .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
3<span class="Special"> <- </span>1
4<span class="Special"> <- </span>0
]
]
<span class="muScenario">scenario</span> editor-does-not-wrap-cursor-when-line-does-not-wrap [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcde]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
left-click 0, 3 <span class="Comment"># one before right, in the last line</span>
press 65514 <span class="Comment"># right arrow</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>0
4<span class="Special"> <- </span>4
]
]
<span class="muScenario">scenario</span> editor-does-not-wrap-cursor-when-line-does-not-wrap-2 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcde</span>
<span class="Constant">f]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
assume-console [
left-click 0, 3 <span class="Comment"># one before right, not the last line</span>
press 65514 <span class="Comment"># right arrow</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>0
4<span class="Special"> <- </span>4
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-to-next-line-with-right-arrow-at-end-of-line [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 0, 3
press 65514 <span class="Comment"># right arrow - next line</span>
type <span class="Constant">[0]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> .0d .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-left-with-key [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 0, 2
press 65515 <span class="Comment"># left arrow</span>
type <span class="Constant">[0]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .a0bc .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-to-previous-line-with-left-arrow-at-start-of-line [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># initialize editor with two lines</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">d]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
<span class="Comment"># position cursor at start of second line (so there's no previous newline)</span>
assume-console [
left-click 1, 0
press 65515 <span class="Comment"># left arrow</span>
type <span class="Constant">[0]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abc0 .</span>
<span class="Constant"> .d .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-to-previous-line-with-left-arrow-at-start-of-line-2 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># initialize editor with three lines</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">def</span>
<span class="Constant">g]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
<span class="Comment"># position cursor further down (so there's a newline before the character at</span>
<span class="Comment"># the cursor)</span>
assume-console [
left-click 2, 0
press 65515 <span class="Comment"># left arrow</span>
type <span class="Constant">[0]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> .def0 .</span>
<span class="Constant"> .g .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-to-previous-line-with-left-arrow-at-start-of-line-3 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">def</span>
<span class="Constant">g]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
<span class="Comment"># position cursor at start of text</span>
assume-console [
left-click 0, 0
press 65515 <span class="Comment"># left arrow should have no effect</span>
type <span class="Constant">[0]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .0abc .</span>
<span class="Constant"> .def .</span>
<span class="Constant"> .g .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-cursor-to-previous-line-with-left-arrow-at-start-of-line-4 [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># initialize editor with text containing an empty line</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
d]
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
<span class="Comment"># position cursor right after empty line</span>
assume-console [
left-click 2, 0
press 65515 <span class="Comment"># left arrow</span>
type <span class="Constant">[0]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
]
screen-should-contain [
<span class="Constant"> .abc .</span>
<span class="Constant"> .0 .</span>
<span class="Constant"> .d .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> editor-moves-across-screen-lines-across-wrap-with-left-arrow [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># initialize editor with text containing an empty line</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcdef]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
screen-should-contain [
<span class="Constant"> .abcd↩ .</span>
<span class="Constant"> .ef .</span>
<span class="Constant"> . .</span>
]
<span class="Comment"># position cursor right after empty line</span>
assume-console [
left-click 1, 0
press 65515 <span class="Comment"># left arrow</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>0 <span class="Comment"># previous row</span>
4<span class="Special"> <- </span>3 <span class="Comment"># end of wrapped line</span>
]
]
<span class="muScenario">scenario</span> editor-moves-to-previous-line-with-up-arrow [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">def]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 1, 1
press 65517 <span class="Comment"># up arrow</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>0
4<span class="Special"> <- </span>1
]
]
<span class="muScenario">scenario</span> editor-moves-to-next-line-with-down-arrow [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">def]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
<span class="Comment"># cursor starts out at (0, 0)</span>
assume-console [
press 65516 <span class="Comment"># down arrow</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
<span class="Comment"># ..and ends at (1, 0)</span>
memory-should-contain [
3<span class="Special"> <- </span>1
4<span class="Special"> <- </span>0
]
]
<span class="muScenario">scenario</span> editor-adjusts-column-at-previous-line [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[ab</span>
<span class="Constant">def]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 1, 3
press 65517 <span class="Comment"># up arrow</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>0
4<span class="Special"> <- </span>2
]
]
<span class="muScenario">scenario</span> editor-adjusts-column-at-next-line [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc</span>
<span class="Constant">de]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">10:literal/right</span>
assume-console [
left-click 0, 3
press 65516 <span class="Comment"># down arrow</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
3:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
4:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
]
memory-should-contain [
3<span class="Special"> <- </span>1
4<span class="Special"> <- </span>2
]
]
<span class="muScenario">scenario</span> point-at-multiple-editors [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># initialize an editor covering left half of screen</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
3:address:array:character<span class="Special"> <- </span>new <span class="Constant">[def]</span>
<span class="Comment"># chain new editor to it, covering the right half of the screen</span>
4:address:address:editor-data<span class="Special"> <- </span>get-address 2:address:editor-data/deref, next-editor:offset
4:address:address:editor-data/deref<span class="Special"> <- </span>new-editor 3:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">5:literal/left</span>, <span class="Constant">10:literal/right</span>
<span class="Comment"># type one letter in each of them</span>
assume-console [
left-click 0, 1
left-click 0, 8
]
run [
event-loop screen:address, console:address, 2:address:editor-data
5:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
6:number<span class="Special"> <- </span>get 4:address:address:editor-data/deref/deref, cursor-column:offset
]
memory-should-contain [
5<span class="Special"> <- </span>1
6<span class="Special"> <- </span>8
]
]
<span class="muScenario">scenario</span> editors-chain-to-cover-multiple-columns [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># initialize an editor covering left half of screen</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
3:address:array:character<span class="Special"> <- </span>new <span class="Constant">[def]</span>
<span class="Comment"># chain new editor to it, covering the right half of the screen</span>
4:address:address:editor-data<span class="Special"> <- </span>get-address 2:address:editor-data/deref, next-editor:offset
4:address:address:editor-data/deref<span class="Special"> <- </span>new-editor 3:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">5:literal/left</span>, <span class="Constant">10:literal/right</span>
reset-focus 2:address:editor-data
<span class="Comment"># type one letter in each of them</span>
assume-console [
left-click 0, 1
type <span class="Constant">[0]</span>
left-click 0, 6
type <span class="Constant">[1]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
5:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
6:number<span class="Special"> <- </span>get 4:address:address:editor-data/deref/deref, cursor-column:offset
]
screen-should-contain [
<span class="Constant"> .a0bc d1ef .</span>
<span class="Constant"> . .</span>
]
memory-should-contain [
5<span class="Special"> <- </span>2
6<span class="Special"> <- </span>7
]
<span class="Comment"># show the cursor at the right window</span>
run [
screen:address<span class="Special"> <- </span>print-character screen:address, <span class="Constant">9251:literal/␣</span>
]
screen-should-contain [
<span class="Constant"> .a0bc d1␣f .</span>
<span class="Constant"> . .</span>
]
]
<span class="muScenario">scenario</span> multiple-editors-cover-only-their-own-areas [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
run [
<span class="Comment"># draw a divider</span>
draw-vertical screen:address, <span class="Constant">5:literal/divider</span>, <span class="Constant">0:literal/top</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># initialize editors on both sides of it and chain the two</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
3:address:array:character<span class="Special"> <- </span>new <span class="Constant">[def]</span>
4:address:address:editor-data<span class="Special"> <- </span>get-address 2:address:editor-data/deref, next-editor:offset
4:address:address:editor-data/deref<span class="Special"> <- </span>new-editor 3:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">6:literal/left</span>, <span class="Constant">10:literal/right</span>
]
<span class="Comment"># divider isn't messed up</span>
screen-should-contain [
<span class="Constant"> .abc │def .</span>
<span class="Constant"> . │ .</span>
<span class="Constant"> . │ .</span>
<span class="Constant"> . │ .</span>
<span class="Constant"> . │ .</span>
]
]
<span class="muScenario">scenario</span> editor-in-focus-keeps-cursor [
assume-screen <span class="Constant">10:literal/width</span>, <span class="Constant">5:literal/height</span>
<span class="Comment"># initialize an editor covering left half of screen</span>
1:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
2:address:editor-data<span class="Special"> <- </span>new-editor 1:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">0:literal/left</span>, <span class="Constant">5:literal/right</span>
3:address:array:character<span class="Special"> <- </span>new <span class="Constant">[def]</span>
<span class="Comment"># chain new editor to it, covering the right half of the screen</span>
4:address:address:editor-data<span class="Special"> <- </span>get-address 2:address:editor-data/deref, next-editor:offset
4:address:address:editor-data/deref<span class="Special"> <- </span>new-editor 3:address:array:character, screen:address, <span class="Constant">0:literal/top</span>, <span class="Constant">5:literal/left</span>, <span class="Constant">10:literal/right</span>
<span class="Comment"># initialize cursor</span>
run [
reset-focus 2:address:editor-data
5:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-row:offset
6:number<span class="Special"> <- </span>get 2:address:editor-data/deref, cursor-column:offset
move-cursor screen:address, 5:number, 6:number
screen:address<span class="Special"> <- </span>print-character screen:address, <span class="Constant">9251:literal/␣</span>
]
<span class="Comment"># is it at the right place?</span>
screen-should-contain [
<span class="Constant"> .␣bc def .</span>
<span class="Constant"> . .</span>
]
<span class="Comment"># now try typing a letter</span>
assume-console [
type <span class="Constant">[z]</span>
]
run [
event-loop screen:address, console:address, 2:address:editor-data
screen:address<span class="Special"> <- </span>print-character screen:address, <span class="Constant">9251:literal/␣</span>
]
<span class="Comment"># cursor should still be right</span>
screen-should-contain [
<span class="Constant"> .z␣bc def .</span>
<span class="Constant"> . .</span>
]
]
<span class="Comment"># set focus to first editor, reset it in later ones</span>
<span class="muRecipe">recipe</span> reset-focus [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
editor:address:editor-data<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
in-focus:address:boolean<span class="Special"> <- </span>get-address editor:address:editor-data/deref, in-focus?:offset
in-focus:address:boolean/deref<span class="Special"> <- </span>copy <span class="Constant">1:literal/true</span>
e:address:editor-data<span class="Special"> <- </span>get editor:address:editor-data/deref, next-editor:offset
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> e:address:editor-data
<span class="CommentedCode">#? $print [resetting focus in ], e:address:editor-data, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
x:address:boolean<span class="Special"> <- </span>get-address e:address:editor-data/deref, in-focus?:offset
<span class="CommentedCode">#? $print [ at ], x:address:boolean, [ </span>
<span class="CommentedCode">#? ] #? 1</span>
x:address:boolean/deref<span class="Special"> <- </span>copy <span class="Constant">0:literal/false</span>
e:address:editor-data<span class="Special"> <- </span>get e:address:editor-data/deref, next-editor:offset
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="SalientComment">## helpers for drawing editor borders</span>
<span class="muRecipe">recipe</span> draw-box [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
top:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
left:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
bottom:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
right:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
color:number, color-found?:boolean<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?:boolean
color:number<span class="Special"> <- </span>copy <span class="Constant">245:literal/grey</span>
<span class="Delimiter">}</span>
<span class="Comment"># top border</span>
draw-horizontal screen:address, top:number, left:number, right:number, color:number
draw-horizontal screen:address, bottom:number, left:number, right:number, color:number
draw-vertical screen:address, left:number, top:number, bottom:number, color:number
draw-vertical screen:address, right:number, top:number, bottom:number, color:number
draw-top-left screen:address, top:number, left:number, color:number
draw-top-right screen:address, top:number, right:number, color:number
draw-bottom-left screen:address, bottom:number, left:number, color:number
draw-bottom-right screen:address, bottom:number, right:number, color:number
<span class="Comment"># position cursor inside box</span>
move-cursor screen:address, top:number, left:number
cursor-down screen:address
cursor-right screen:address
]
<span class="muRecipe">recipe</span> draw-horizontal [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
row:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
x:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
right:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
color:number, color-found?:boolean<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?:boolean
color:number<span class="Special"> <- </span>copy <span class="Constant">245:literal/grey</span>
<span class="Delimiter">}</span>
move-cursor screen:address, row:number, x:number
<span class="Delimiter">{</span>
continue?:boolean<span class="Special"> <- </span>lesser-than x:number, right:number
<span class="muControl">break-unless</span> continue?:boolean
print-character screen:address, <span class="Constant">9472:literal/horizontal</span>, color:number
x:number<span class="Special"> <- </span>add x:number, <span class="Constant">1:literal</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">recipe</span> draw-vertical [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
col:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
x:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
bottom:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
color:number, color-found?:boolean<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?:boolean
color:number<span class="Special"> <- </span>copy <span class="Constant">245:literal/grey</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
continue?:boolean<span class="Special"> <- </span>lesser-than x:number, bottom:number
<span class="muControl">break-unless</span> continue?:boolean
move-cursor screen:address, x:number, col:number
print-character screen:address, <span class="Constant">9474:literal/vertical</span>, color:number
x:number<span class="Special"> <- </span>add x:number, <span class="Constant">1:literal</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">recipe</span> draw-top-left [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
top:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
left:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
color:number, color-found?:boolean<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?:boolean
color:number<span class="Special"> <- </span>copy <span class="Constant">245:literal/grey</span>
<span class="Delimiter">}</span>
move-cursor screen:address, top:number, left:number
print-character screen:address, <span class="Constant">9484:literal/down-right</span>, color:number
]
<span class="muRecipe">recipe</span> draw-top-right [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
top:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
right:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
color:number, color-found?:boolean<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?:boolean
color:number<span class="Special"> <- </span>copy <span class="Constant">245:literal/grey</span>
<span class="Delimiter">}</span>
move-cursor screen:address, top:number, right:number
print-character screen:address, <span class="Constant">9488:literal/down-left</span>, color:number
]
<span class="muRecipe">recipe</span> draw-bottom-left [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
bottom:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
left:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
color:number, color-found?:boolean<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?:boolean
color:number<span class="Special"> <- </span>copy <span class="Constant">245:literal/grey</span>
<span class="Delimiter">}</span>
move-cursor screen:address, bottom:number, left:number
print-character screen:address, <span class="Constant">9492:literal/up-right</span>, color:number
]
<span class="muRecipe">recipe</span> draw-bottom-right [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
screen:address<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
bottom:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
right:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
color:number, color-found?:boolean<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?:boolean
color:number<span class="Special"> <- </span>copy <span class="Constant">245:literal/grey</span>
<span class="Delimiter">}</span>
move-cursor screen:address, bottom:number, right:number
print-character screen:address, <span class="Constant">9496:literal/up-left</span>, color:number
]
</pre>
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