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<pre id='vimCodeElement'>
<span class="Comment"># Wrappers around print primitives that take a 'screen' object and are thus</span>
<span class="Comment"># easier to test.</span>
container screen <span class="Delimiter">[</span>
num-rows:integer
num-columns:integer
cursor-row:integer
cursor-column:integer
data:address:array:character
<span class="Delimiter">]</span>
recipe init-fake-screen <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal/capacity
result:address:screen<span class="Special"> <- </span>new screen:type
width:address:integer<span class="Special"> <- </span>get-address result:address:screen/deref, num-columns:offset
width:address:integer/deref<span class="Special"> <- </span>next-ingredient
height:address:integer<span class="Special"> <- </span>get-address result:address:screen/deref, num-rows:offset
height:address:integer/deref<span class="Special"> <- </span>next-ingredient
row:address:integer<span class="Special"> <- </span>get-address result:address:screen/deref, cursor-row:offset
row:address:integer/deref<span class="Special"> <- </span>copy 0:literal
column:address:integer<span class="Special"> <- </span>get-address result:address:screen/deref, cursor-column:offset
column:address:integer/deref<span class="Special"> <- </span>copy 0:literal
bufsize:integer<span class="Special"> <- </span>multiply width:address:integer/deref, height:address:integer/deref
buf:address:address:array:character<span class="Special"> <- </span>get-address result:address:screen/deref, data:offset
buf:address:address:array:character/deref<span class="Special"> <- </span>new character:literal, bufsize:integer
clear-screen result:address:screen
<span class="Identifier">reply</span> result:address:screen
<span class="Delimiter">]</span>
recipe clear-screen <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
<span class="Comment"># if x exists</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:screen
<span class="Comment"># clear fake screen</span>
buf:address:array:character<span class="Special"> <- </span>get x:address:screen/deref, data:offset
max:integer<span class="Special"> <- </span>length buf:address:array:character/deref
i:integer<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal i:integer, max:integer
<span class="Identifier">break-if</span> done?:boolean
c:address:character<span class="Special"> <- </span>index-address buf:address:array:character/deref, i:integer
c:address:character/deref<span class="Special"> <- </span>copy <span class="Delimiter">[</span> <span class="Delimiter">]</span>
i:integer<span class="Special"> <- </span>add i:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
clear-display
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">]</span>
recipe print-character <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
c:character<span class="Special"> <- </span>next-ingredient
<span class="CommentedCode">#? $print x:address:character #? 1</span>
<span class="CommentedCode">#? $print [ print-character #? 1</span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Delimiter">{</span>
<span class="Comment"># if x exists</span>
<span class="Identifier">break-unless</span> x:address:screen
<span class="CommentedCode">#? $print [print-character2 #? 1</span>
<span class="CommentedCode">#? ] #? 1</span>
<span class="Comment"># save character in fake screen</span>
row:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref, cursor-row:offset
column:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref, cursor-column:offset
width:integer<span class="Special"> <- </span>get x:address:screen/deref, num-columns:offset
index:integer<span class="Special"> <- </span>multiply row:address:integer/deref, width:integer
index:integer<span class="Special"> <- </span>add index:integer, column:address:integer/deref
buf:address:array:character<span class="Special"> <- </span>get x:address:screen/deref, data:offset
cursor:address:character<span class="Special"> <- </span>index-address buf:address:array:character/deref, index:integer
<span class="CommentedCode">#? $print cursor:address:character #? 1</span>
<span class="CommentedCode">#? $print [ #? 1</span>
<span class="CommentedCode">#? ] #? 1</span>
cursor:address:character/deref<span class="Special"> <- </span>copy c:character <span class="Comment"># todo: newline, etc.</span>
<span class="Comment"># increment column unless it's already all the way to the right</span>
<span class="Delimiter">{</span>
at-right?:boolean<span class="Special"> <- </span>equal column:address:integer/deref, width:integer
<span class="Identifier">break-if</span> at-right?:boolean
column:address:integer/deref<span class="Special"> <- </span>add column:address:integer/deref, 1:literal
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
print-character-to-display c:character
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">]</span>
scenario print-character-at-top-left <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
<span class="CommentedCode">#? $start-tracing #? 3</span>
1:address:screen<span class="Special"> <- </span>init-fake-screen 3:literal/width, 2:literal/height
1:address:screen<span class="Special"> <- </span>print-character 1:address:screen, 97:literal <span class="Comment"># 'a'</span>
2:address:array:character<span class="Special"> <- </span>get 1:address:screen/deref, data:offset
3:array:character<span class="Special"> <- </span>copy 2:address:array:character/deref
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
3<span class="Special"> <- </span>6 <span class="Comment"># width*height</span>
4<span class="Special"> <- </span>97 <span class="Comment"># 'a'</span>
5<span class="Special"> <- </span>0
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
recipe clear-line <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
<span class="Comment"># if x exists, clear line in fake screen</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:screen
n:integer<span class="Special"> <- </span>get x:address:screen/deref, num-columns:offset
column:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref, cursor-column:offset
original-column:integer<span class="Special"> <- </span>copy column:address:integer/deref
<span class="Comment"># space over the entire line</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal column:address:integer/deref, n:integer
<span class="Identifier">break-if</span> done?:boolean
print-character x:address:screen, <span class="Delimiter">[</span> <span class="Delimiter">]</span> <span class="Comment"># implicitly updates 'column'</span>
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># now back to where the cursor was</span>
column:address:integer/deref<span class="Special"> <- </span>copy original-column:integer
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
clear-line-on-display
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">]</span>
recipe cursor-position <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
<span class="Comment"># if x exists, lookup cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:screen
row:integer<span class="Special"> <- </span>get x:address:screen/deref, cursor-row:offset
column:integer<span class="Special"> <- </span>get x:address:screen/deref, cursor-column:offset
<span class="Identifier">reply</span> row:integer, column:integer
<span class="Delimiter">}</span>
row:integer, column:integer<span class="Special"> <- </span>cursor-position-on-display
<span class="Identifier">reply</span> row:integer, column:integer
<span class="Delimiter">]</span>
recipe move-cursor <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
new-row:integer<span class="Special"> <- </span>next-ingredient
new-column:integer<span class="Special"> <- </span>next-ingredient
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:screen
row:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref cursor-row:offset
row:address:integer/deref<span class="Special"> <- </span>copy new-row:integer
column:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref cursor-column:offset
column:address:integer/deref<span class="Special"> <- </span>copy new-column:integer
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-on-display new-row:integer, new-column:integer
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">]</span>
scenario clear-line-erases-printed-characters <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
<span class="CommentedCode">#? $start-tracing #? 3</span>
1:address:screen<span class="Special"> <- </span>init-fake-screen 3:literal/width, 2:literal/height
<span class="Comment"># print a character</span>
1:address:screen<span class="Special"> <- </span>print-character 1:address:screen, 97:literal <span class="Comment"># 'a'</span>
<span class="Comment"># move cursor to start of line</span>
1:address:screen<span class="Special"> <- </span>move-cursor 1:address:screen, 0:literal/row, 0:literal/column
<span class="Comment"># clear line</span>
1:address:screen<span class="Special"> <- </span>clear-line 1:address:screen
2:address:array:character<span class="Special"> <- </span>get 1:address:screen/deref, data:offset
3:array:character<span class="Special"> <- </span>copy 2:address:array:character/deref
<span class="Delimiter">]</span>
<span class="Comment"># screen should be blank</span>
memory-should-contain <span class="Delimiter">[</span>
3<span class="Special"> <- </span>6 <span class="Comment"># width*height</span>
4<span class="Special"> <- </span>0
5<span class="Special"> <- </span>0
6<span class="Special"> <- </span>0
7<span class="Special"> <- </span>0
8<span class="Special"> <- </span>0
9<span class="Special"> <- </span>0
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
recipe cursor-down <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:screen
<span class="Delimiter">{</span>
<span class="Comment"># if row < height</span>
height:integer<span class="Special"> <- </span>get x:address:screen/deref, num-rows:offset
row:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref cursor-row:offset
at-bottom?:boolean<span class="Special"> <- </span>greater-or-equal row:address:integer/deref, height:integer
<span class="Identifier">break-if</span> at-bottom?:boolean
<span class="Comment"># row = row+1</span>
row:address:integer/deref<span class="Special"> <- </span>add row:address:integer, 1:literal
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-down-on-display
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">]</span>
recipe cursor-up <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:screen
<span class="Delimiter">{</span>
<span class="Comment"># if row >= 0</span>
row:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref cursor-row:offset
at-top?:boolean<span class="Special"> <- </span>lesser-than row:address:integer/deref, 0:literal
<span class="Identifier">break-if</span> at-top?:boolean
<span class="Comment"># row = row-1</span>
row:address:integer/deref<span class="Special"> <- </span>subtract row:address:integer, 1:literal
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-up-on-display
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">]</span>
recipe cursor-right <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:screen
<span class="Delimiter">{</span>
<span class="Comment"># if column < width</span>
width:integer<span class="Special"> <- </span>get x:address:screen/deref, num-columns:offset
column:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref cursor-column:offset
at-bottom?:boolean<span class="Special"> <- </span>greater-or-equal column:address:integer/deref, width:integer
<span class="Identifier">break-if</span> at-bottom?:boolean
<span class="Comment"># column = column+1</span>
column:address:integer/deref<span class="Special"> <- </span>add column:address:integer, 1:literal
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-right-on-display
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">]</span>
recipe cursor-left <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:screen<span class="Special"> <- </span>next-ingredient
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:screen
<span class="Delimiter">{</span>
<span class="Comment"># if column >= 0</span>
column:address:integer<span class="Special"> <- </span>get-address x:address:screen/deref cursor-column:offset
at-top?:boolean<span class="Special"> <- </span>lesser-than column:address:integer/deref, 0:literal
<span class="Identifier">break-if</span> at-top?:boolean
<span class="Comment"># column = column-1</span>
column:address:integer/deref<span class="Special"> <- </span>subtract column:address:integer, 1:literal
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-left-on-display
<span class="Identifier">reply</span> x:address:screen/same-as-ingredient:0
<span class="Delimiter">]</span>
</pre>
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