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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>
<span class="muData">container</span> screen [
num-rows:number
num-columns:number
cursor-row:number
cursor-column:number
data:address:array:screen-cell
]
<span class="muData">container</span> screen-cell [
contents:character
color:number
]
<span class="muRecipe">def</span> new-fake-screen w:number, h:number<span class="muRecipe"> -> </span>result:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result<span class="Special"> <- </span>new <span class="Constant">screen:type</span>
bufsize:number<span class="Special"> <- </span>multiply w, h
data:address:array:screen-cell<span class="Special"> <- </span>new <span class="Constant">screen-cell:type</span>, bufsize
*result<span class="Special"> <- </span>merge h/num-rows, w/num-columns, <span class="Constant">0/cursor-row</span>, <span class="Constant">0/cursor-column</span>, data
result<span class="Special"> <- </span>clear-screen result
]
<span class="muRecipe">def</span> clear-screen screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="Comment"># clear fake screen</span>
buf:address:array:screen-cell<span class="Special"> <- </span>get *screen, <span class="Constant">data:offset</span>
max:number<span class="Special"> <- </span>length *buf
i:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal i, max
<span class="muControl">break-if</span> done?
curr:screen-cell<span class="Special"> <- </span>merge <span class="Constant">0/empty</span>, <span class="Constant">7/white</span>
*buf<span class="Special"> <- </span>put-index *buf, i, curr
i<span class="Special"> <- </span>add i, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># reset cursor</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-row:offset</span>, <span class="Constant">0</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-column:offset</span>, <span class="Constant">0</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
clear-display
]
<span class="muRecipe">def</span> sync-screen screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> screen
sync-display
<span class="Delimiter">}</span>
<span class="Comment"># do nothing for fake screens</span>
]
<span class="muRecipe">def</span> fake-screen-is-empty? screen:address:screen<span class="muRecipe"> -> </span>result:boolean [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="muControl">return-unless</span> screen, <span class="Constant">1/true</span>
buf:address:array:screen-cell<span class="Special"> <- </span>get *screen, <span class="Constant">data:offset</span>
i:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
len:number<span class="Special"> <- </span>length *buf
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal i, len
<span class="muControl">break-if</span> done?
curr:screen-cell<span class="Special"> <- </span>index *buf, i
curr-contents:character<span class="Special"> <- </span>get curr, <span class="Constant">contents:offset</span>
i<span class="Special"> <- </span>add i, <span class="Constant">1</span>
<span class="muControl">loop-unless</span> curr-contents
<span class="Comment"># not 0</span>
<span class="muControl">return</span> <span class="Constant">0/false</span>
<span class="Delimiter">}</span>
<span class="muControl">return</span> <span class="Constant">1/true</span>
]
<span class="muRecipe">def</span> print screen:address:screen, c:character<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</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?
color<span class="Special"> <- </span>copy <span class="Constant">7/white</span>
<span class="Delimiter">}</span>
bg-color:number, bg-color-found?:boolean<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="Comment"># default bg-color to black</span>
<span class="muControl">break-if</span> bg-color-found?
bg-color<span class="Special"> <- </span>copy <span class="Constant">0/black</span>
<span class="Delimiter">}</span>
trace <span class="Constant">90</span>, <span class="Constant">[print-character]</span>, c
<span class="Delimiter">{</span>
<span class="Comment"># if x exists</span>
<span class="Comment"># (handle special cases exactly like in the real screen)</span>
<span class="muControl">break-unless</span> screen
width:number<span class="Special"> <- </span>get *screen, <span class="Constant">num-columns:offset</span>
height:number<span class="Special"> <- </span>get *screen, <span class="Constant">num-rows:offset</span>
<span class="Comment"># if cursor is out of bounds, silently exit</span>
row:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-row:offset</span>
legal?:boolean<span class="Special"> <- </span>greater-or-equal row, <span class="Constant">0</span>
<span class="muControl">return-unless</span> legal?
legal?<span class="Special"> <- </span>lesser-than row, height
<span class="muControl">return-unless</span> legal?
column:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-column:offset</span>
legal?<span class="Special"> <- </span>greater-or-equal column, <span class="Constant">0</span>
<span class="muControl">return-unless</span> legal?
legal?<span class="Special"> <- </span>lesser-than column, width
<span class="muControl">return-unless</span> legal?
<span class="CommentedCode">#? $print [print-character (], row, [, ], column, [): ], c, 10/newline</span>
<span class="Comment"># special-case: newline</span>
<span class="Delimiter">{</span>
newline?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">10/newline</span>
<span class="muControl">break-unless</span> newline?
<span class="Delimiter">{</span>
<span class="Comment"># unless cursor is already at bottom</span>
bottom:number<span class="Special"> <- </span>subtract height, <span class="Constant">1</span>
at-bottom?:boolean<span class="Special"> <- </span>greater-or-equal row, bottom
<span class="muControl">break-if</span> at-bottom?
<span class="Comment"># move it to the next row</span>
column<span class="Special"> <- </span>copy <span class="Constant">0</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-column:offset</span>, column
row<span class="Special"> <- </span>add row, <span class="Constant">1</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-row:offset</span>, row
<span class="Delimiter">}</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># save character in fake screen</span>
index:number<span class="Special"> <- </span>multiply row, width
index<span class="Special"> <- </span>add index, column
buf:address:array:screen-cell<span class="Special"> <- </span>get *screen, <span class="Constant">data:offset</span>
len:number<span class="Special"> <- </span>length *buf
<span class="Comment"># special-case: backspace</span>
<span class="Delimiter">{</span>
backspace?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">8</span>
<span class="muControl">break-unless</span> backspace?
<span class="Delimiter">{</span>
<span class="Comment"># unless cursor is already at left margin</span>
at-left?:boolean<span class="Special"> <- </span>lesser-or-equal column, <span class="Constant">0</span>
<span class="muControl">break-if</span> at-left?
<span class="Comment"># clear previous location</span>
column<span class="Special"> <- </span>subtract column, <span class="Constant">1</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-column:offset</span>, column
index<span class="Special"> <- </span>subtract index, <span class="Constant">1</span>
cursor:screen-cell<span class="Special"> <- </span>merge <span class="Constant">32/space</span>, <span class="Constant">7/white</span>
*buf<span class="Special"> <- </span>put-index *buf, index, cursor
<span class="Delimiter">}</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
cursor:screen-cell<span class="Special"> <- </span>merge c, color
*buf<span class="Special"> <- </span>put-index *buf, index, cursor
<span class="Comment"># increment column unless it's already all the way to the right</span>
<span class="Delimiter">{</span>
right:number<span class="Special"> <- </span>subtract width, <span class="Constant">1</span>
at-right?:boolean<span class="Special"> <- </span>greater-or-equal column, right
<span class="muControl">break-if</span> at-right?
column<span class="Special"> <- </span>add column, <span class="Constant">1</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-column:offset</span>, column
<span class="Delimiter">}</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
print-character-to-display c, color, bg-color
]
<span class="muScenario">scenario</span> print-character-at-top-left [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span class="Constant">11</span>:character<span class="Special"> <- </span>copy <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">11</span>:character/a
<span class="Constant">2</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">3</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">2</span>:address:array:screen-cell
]
memory-should-contain [
<span class="Constant">3</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># width*height</span>
<span class="Constant">4</span><span class="Special"> <- </span><span class="Constant">97</span> <span class="Comment"># 'a'</span>
<span class="Constant">5</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">6</span><span class="Special"> <- </span><span class="Constant">0</span>
]
]
<span class="muScenario">scenario</span> print-character-in-color [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span class="Constant">11</span>:character<span class="Special"> <- </span>copy <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">11</span>:character/a, <span class="Constant">1/red</span>
<span class="Constant">2</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">3</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">2</span>:address:array:screen-cell
]
memory-should-contain [
<span class="Constant">3</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># width*height</span>
<span class="Constant">4</span><span class="Special"> <- </span><span class="Constant">97</span> <span class="Comment"># 'a'</span>
<span class="Constant">5</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># red</span>
<span class="Constant">6</span><span class="Special"> <- </span><span class="Constant">0</span>
]
]
<span class="muScenario">scenario</span> print-backspace-character [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span class="Constant">11</span>:character<span class="Special"> <- </span>copy <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">11</span>:character/a
<span class="Constant">12</span>:character<span class="Special"> <- </span>copy <span class="Constant">8/backspace</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">12</span>:character/backspace
<span class="Constant">2</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-column:offset</span>
<span class="Constant">3</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">4</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">3</span>:address:array:screen-cell
]
memory-should-contain [
<span class="Constant">2</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># cursor column</span>
<span class="Constant">4</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># width*height</span>
<span class="Constant">5</span><span class="Special"> <- </span><span class="Constant">32</span> <span class="Comment"># space, not 'a'</span>
<span class="Constant">6</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">7</span><span class="Special"> <- </span><span class="Constant">0</span>
]
]
<span class="muScenario">scenario</span> print-extra-backspace-character [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span class="Constant">11</span>:character<span class="Special"> <- </span>copy <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">11</span>:character/a
<span class="Constant">12</span>:character<span class="Special"> <- </span>copy <span class="Constant">8/backspace</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">12</span>:character/backspace
<span class="Constant">12</span>:character<span class="Special"> <- </span>copy <span class="Constant">8/backspace</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">12</span>:character/backspace
<span class="Constant">2</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-column:offset</span>
<span class="Constant">3</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">4</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">3</span>:address:array:screen-cell
]
memory-should-contain [
<span class="Constant">2</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># cursor column</span>
<span class="Constant">4</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># width*height</span>
<span class="Constant">5</span><span class="Special"> <- </span><span class="Constant">32</span> <span class="Comment"># space, not 'a'</span>
<span class="Constant">6</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">7</span><span class="Special"> <- </span><span class="Constant">0</span>
]
]
<span class="muScenario">scenario</span> print-character-at-right-margin [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">2/width</span>, <span class="Constant">2/height</span>
<span class="Constant">11</span>:character<span class="Special"> <- </span>copy <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">11</span>:character/a
<span class="Constant">12</span>:character<span class="Special"> <- </span>copy <span class="Constant">98/b</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">12</span>:character/b
<span class="Constant">13</span>:character<span class="Special"> <- </span>copy <span class="Constant">99/b</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">13</span>:character/c
<span class="Constant">2</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-column:offset</span>
<span class="Constant">3</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">4</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">3</span>:address:array:screen-cell
]
memory-should-contain [
<span class="Constant">2</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># cursor column</span>
<span class="Constant">4</span><span class="Special"> <- </span><span class="Constant">4</span> <span class="Comment"># width*height</span>
<span class="Constant">5</span><span class="Special"> <- </span><span class="Constant">97</span> <span class="Comment"># 'a'</span>
<span class="Constant">6</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">7</span><span class="Special"> <- </span><span class="Constant">99</span> <span class="Comment"># 'c' over 'b'</span>
<span class="Constant">8</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">9</span><span class="Special"> <- </span><span class="Constant">0</span>
]
]
<span class="muScenario">scenario</span> print-newline-character [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span class="Constant">10</span>:character<span class="Special"> <- </span>copy <span class="Constant">10/newline</span>
<span class="Constant">11</span>:character<span class="Special"> <- </span>copy <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">11</span>:character/a
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">10</span>:character/newline
<span class="Constant">2</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-row:offset</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-column:offset</span>
<span class="Constant">4</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">5</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">4</span>:address:array:screen-cell
]
memory-should-contain [
<span class="Constant">2</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># cursor row</span>
<span class="Constant">3</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># cursor column</span>
<span class="Constant">5</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># width*height</span>
<span class="Constant">6</span><span class="Special"> <- </span><span class="Constant">97</span> <span class="Comment"># 'a'</span>
<span class="Constant">7</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">8</span><span class="Special"> <- </span><span class="Constant">0</span>
]
]
<span class="muScenario">scenario</span> print-newline-at-bottom-line [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span class="Constant">10</span>:character<span class="Special"> <- </span>copy <span class="Constant">10/newline</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">10</span>:character/newline
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">10</span>:character/newline
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">10</span>:character/newline
<span class="Constant">2</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-row:offset</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-column:offset</span>
]
memory-should-contain [
<span class="Constant">2</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># cursor row</span>
<span class="Constant">3</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># cursor column</span>
]
]
<span class="muScenario">scenario</span> print-character-at-bottom-right [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">2/width</span>, <span class="Constant">2/height</span>
<span class="Constant">10</span>:character<span class="Special"> <- </span>copy <span class="Constant">10/newline</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">10</span>:character/newline
<span class="Constant">11</span>:character<span class="Special"> <- </span>copy <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">11</span>:character/a
<span class="Constant">12</span>:character<span class="Special"> <- </span>copy <span class="Constant">98/b</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">12</span>:character/b
<span class="Constant">13</span>:character<span class="Special"> <- </span>copy <span class="Constant">99/c</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">13</span>:character/c
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">10</span>:character/newline
<span class="Constant">14</span>:character<span class="Special"> <- </span>copy <span class="Constant">100/d</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">14</span>:character/d
<span class="Constant">2</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-row:offset</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">cursor-column:offset</span>
<span class="Constant">4</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">20</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">4</span>:address:array:screen-cell
]
memory-should-contain [
<span class="Constant">2</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># cursor row</span>
<span class="Constant">3</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># cursor column</span>
<span class="Constant">20</span><span class="Special"> <- </span><span class="Constant">4</span> <span class="Comment"># width*height</span>
<span class="Constant">21</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># unused</span>
<span class="Constant">22</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">23</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># unused</span>
<span class="Constant">24</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">25</span><span class="Special"> <- </span><span class="Constant">97</span> <span class="Comment"># 'a'</span>
<span class="Constant">26</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">27</span><span class="Special"> <- </span><span class="Constant">100</span> <span class="Comment"># 'd' over 'b' and 'c' and newline</span>
<span class="Constant">28</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">29</span><span class="Special"> <- </span><span class="Constant">0</span>
]
]
<span class="muRecipe">def</span> clear-line screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
space:character<span class="Special"> <- </span>copy <span class="Constant">0/nul</span>
<span class="Comment"># if x exists, clear line in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
width:number<span class="Special"> <- </span>get *screen, <span class="Constant">num-columns:offset</span>
column:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-column:offset</span>
original-column:number<span class="Special"> <- </span>copy column
<span class="Comment"># space over the entire line</span>
<span class="Delimiter">{</span>
right:number<span class="Special"> <- </span>subtract width, <span class="Constant">1</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal column, right
<span class="muControl">break-if</span> done?
print screen, space
column<span class="Special"> <- </span>add column, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># now back to where the cursor was</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-column:offset</span>, original-column
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
clear-line-on-display
]
<span class="muRecipe">def</span> cursor-position screen:address:screen<span class="muRecipe"> -> </span>row:number, column:number [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists, lookup cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
row:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-row:offset</span>
column:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-column:offset</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
row, column<span class="Special"> <- </span>cursor-position-on-display
]
<span class="muRecipe">def</span> move-cursor screen:address:screen, new-row:number, new-column:number<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-row:offset</span>, new-row
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-column:offset</span>, new-column
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-on-display new-row, new-column
]
<span class="muScenario">scenario</span> clear-line-erases-printed-characters [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span class="Comment"># print a character</span>
<span class="Constant">10</span>:character<span class="Special"> <- </span>copy <span class="Constant">97/a</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">10</span>:character/a
<span class="Comment"># move cursor to start of line</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>move-cursor <span class="Constant">1</span>:address:screen, <span class="Constant">0/row</span>, <span class="Constant">0/column</span>
<span class="Comment"># clear line</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>clear-line <span class="Constant">1</span>:address:screen
<span class="Constant">2</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">20</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">2</span>:address:array:screen-cell
]
<span class="Comment"># screen should be blank</span>
memory-should-contain [
<span class="Constant">20</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># width*height</span>
<span class="Constant">21</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">22</span><span class="Special"> <- </span><span class="Constant">7</span>
<span class="Constant">23</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">24</span><span class="Special"> <- </span><span class="Constant">7</span>
<span class="Constant">25</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">26</span><span class="Special"> <- </span><span class="Constant">7</span>
<span class="Constant">27</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">28</span><span class="Special"> <- </span><span class="Constant">7</span>
<span class="Constant">29</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">30</span><span class="Special"> <- </span><span class="Constant">7</span>
<span class="Constant">31</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">32</span><span class="Special"> <- </span><span class="Constant">7</span>
]
]
<span class="muRecipe">def</span> cursor-down screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="Delimiter">{</span>
<span class="Comment"># increment row unless it's already all the way down</span>
height:number<span class="Special"> <- </span>get *screen, <span class="Constant">num-rows:offset</span>
row:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-row:offset</span>
max:number<span class="Special"> <- </span>subtract height, <span class="Constant">1</span>
at-bottom?:boolean<span class="Special"> <- </span>greater-or-equal row, max
<span class="muControl">break-if</span> at-bottom?
row<span class="Special"> <- </span>add row, <span class="Constant">1</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-row:offset</span>, row
<span class="Delimiter">}</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-down-on-display
]
<span class="muRecipe">def</span> cursor-up screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="Delimiter">{</span>
<span class="Comment"># decrement row unless it's already all the way up</span>
row:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-row:offset</span>
at-top?:boolean<span class="Special"> <- </span>lesser-or-equal row, <span class="Constant">0</span>
<span class="muControl">break-if</span> at-top?
row<span class="Special"> <- </span>subtract row, <span class="Constant">1</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-row:offset</span>, row
<span class="Delimiter">}</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-up-on-display
]
<span class="muRecipe">def</span> cursor-right screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="Delimiter">{</span>
<span class="Comment"># increment column unless it's already all the way to the right</span>
width:number<span class="Special"> <- </span>get *screen, <span class="Constant">num-columns:offset</span>
column:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-column:offset</span>
max:number<span class="Special"> <- </span>subtract width, <span class="Constant">1</span>
at-bottom?:boolean<span class="Special"> <- </span>greater-or-equal column, max
<span class="muControl">break-if</span> at-bottom?
column<span class="Special"> <- </span>add column, <span class="Constant">1</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-column:offset</span>, column
<span class="Delimiter">}</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-right-on-display
]
<span class="muRecipe">def</span> cursor-left screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="Delimiter">{</span>
<span class="Comment"># decrement column unless it's already all the way to the left</span>
column:number<span class="Special"> <- </span>get *screen, <span class="Constant">cursor-column:offset</span>
at-top?:boolean<span class="Special"> <- </span>lesser-or-equal column, <span class="Constant">0</span>
<span class="muControl">break-if</span> at-top?
column<span class="Special"> <- </span>subtract column, <span class="Constant">1</span>
*screen<span class="Special"> <- </span>put *screen, <span class="Constant">cursor-column:offset</span>, column
<span class="Delimiter">}</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
move-cursor-left-on-display
]
<span class="muRecipe">def</span> cursor-to-start-of-line screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
row:number<span class="Special"> <- </span>cursor-position screen
column:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
screen<span class="Special"> <- </span>move-cursor screen, row, column
]
<span class="muRecipe">def</span> cursor-to-next-line screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
screen<span class="Special"> <- </span>cursor-down screen
screen<span class="Special"> <- </span>cursor-to-start-of-line screen
]
<span class="muRecipe">def</span> screen-width screen:address:screen<span class="muRecipe"> -> </span>width:number [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
width<span class="Special"> <- </span>get *screen, <span class="Constant">num-columns:offset</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
width<span class="Special"> <- </span>display-width
]
<span class="muRecipe">def</span> screen-height screen:address:screen<span class="muRecipe"> -> </span>height:number [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists, move cursor in fake screen</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
height<span class="Special"> <- </span>get *screen, <span class="Constant">num-rows:offset</span>
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
height<span class="Special"> <- </span>display-height
]
<span class="muRecipe">def</span> hide-cursor screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists (not real display), do nothing</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
hide-cursor-on-display
]
<span class="muRecipe">def</span> show-cursor screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists (not real display), do nothing</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
show-cursor-on-display
]
<span class="muRecipe">def</span> hide-screen screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists (not real display), do nothing</span>
<span class="Comment"># todo: help test this</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
hide-display
]
<span class="muRecipe">def</span> show-screen screen:address:screen<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if x exists (not real display), do nothing</span>
<span class="Comment"># todo: help test this</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> screen
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># otherwise, real screen</span>
show-display
]
<span class="muRecipe">def</span> print screen:address:screen, s:address:array:character<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</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?
color<span class="Special"> <- </span>copy <span class="Constant">7/white</span>
<span class="Delimiter">}</span>
bg-color:number, bg-color-found?:boolean<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="Comment"># default bg-color to black</span>
<span class="muControl">break-if</span> bg-color-found?
bg-color<span class="Special"> <- </span>copy <span class="Constant">0/black</span>
<span class="Delimiter">}</span>
len:number<span class="Special"> <- </span>length *s
i:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal i, len
<span class="muControl">break-if</span> done?
c:character<span class="Special"> <- </span>index *s, i
print screen, c, color, bg-color
i<span class="Special"> <- </span>add i, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muScenario">scenario</span> print-text-stops-at-right-margin [
run [
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>new-fake-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span class="Constant">2</span>:address:array:character<span class="Special"> <- </span>new <span class="Constant">[abcd]</span>
<span class="Constant">1</span>:address:screen<span class="Special"> <- </span>print <span class="Constant">1</span>:address:screen, <span class="Constant">2</span>:address:array:character
<span class="Constant">3</span>:address:array:screen-cell<span class="Special"> <- </span>get *<span class="Constant">1</span>:address:screen, <span class="Constant">data:offset</span>
<span class="Constant">4</span>:array:screen-cell<span class="Special"> <- </span>copy *<span class="Constant">3</span>:address:array:screen-cell
]
memory-should-contain [
<span class="Constant">4</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># width*height</span>
<span class="Constant">5</span><span class="Special"> <- </span><span class="Constant">97</span> <span class="Comment"># 'a'</span>
<span class="Constant">6</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">7</span><span class="Special"> <- </span><span class="Constant">98</span> <span class="Comment"># 'b'</span>
<span class="Constant">8</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">9</span><span class="Special"> <- </span><span class="Constant">100</span> <span class="Comment"># 'd' overwrites 'c'</span>
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">7</span> <span class="Comment"># white</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># unused</span>
]
]
<span class="muRecipe">def</span> print-integer screen:address:screen, n:number<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</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?
color<span class="Special"> <- </span>copy <span class="Constant">7/white</span>
<span class="Delimiter">}</span>
bg-color:number, bg-color-found?:boolean<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="Comment"># default bg-color to black</span>
<span class="muControl">break-if</span> bg-color-found?
bg-color<span class="Special"> <- </span>copy <span class="Constant">0/black</span>
<span class="Delimiter">}</span>
<span class="Comment"># todo: other bases besides decimal</span>
s:address:array:character<span class="Special"> <- </span>to-text n
screen<span class="Special"> <- </span>print screen, s, color, bg-color
]
<span class="Comment"># for now, we can only print integers</span>
<span class="muRecipe">def</span> print screen:address:screen, n:number<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</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?
color<span class="Special"> <- </span>copy <span class="Constant">7/white</span>
<span class="Delimiter">}</span>
bg-color:number, bg-color-found?:boolean<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="Comment"># default bg-color to black</span>
<span class="muControl">break-if</span> bg-color-found?
bg-color<span class="Special"> <- </span>copy <span class="Constant">0/black</span>
<span class="Delimiter">}</span>
screen<span class="Special"> <- </span>print-integer screen, n, color, bg-color
]
<span class="Comment"># addresses</span>
<span class="muRecipe">def</span> print screen:address:screen, n:address:_elem<span class="muRecipe"> -> </span>screen:address:screen [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</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?
color<span class="Special"> <- </span>copy <span class="Constant">7/white</span>
<span class="Delimiter">}</span>
bg-color:number, bg-color-found?:boolean<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="Comment"># default bg-color to black</span>
<span class="muControl">break-if</span> bg-color-found?
bg-color<span class="Special"> <- </span>copy <span class="Constant">0/black</span>
<span class="Delimiter">}</span>
n2:number<span class="Special"> <- </span>copy n
screen<span class="Special"> <- </span>print-integer screen, n2, color, bg-color
]
</pre>
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