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* 6397Kartik Agaram2020-05-241-0/+362
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<pre id='vimCodeElement'>
<span class="SalientComment">## running code from the editor and creating sandboxes</span>
<span class="Comment">#</span>
<span class="Comment"># Running code in the sandbox editor prepends its contents to a list of</span>
<span class="Comment"># (non-editable) sandboxes below the editor, showing the result and a maybe</span>
<span class="Comment"># few other things.</span>

<span class="muRecipe">recipe!</span> main [
  <span class="Constant">local-scope</span>
  open-console
  initial-recipe:address:array:character<span class="Special"> &lt;- </span>restore <span class="Constant">[recipes.mu]</span>
  initial-sandbox:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
  hide-screen <span class="Constant">0/screen</span>
  env:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment <span class="Constant">0/screen</span>, initial-recipe, initial-sandbox
  env<span class="Special"> &lt;- </span>restore-sandboxes env
  render-all <span class="Constant">0/screen</span>, env
  event-loop <span class="Constant">0/screen</span>, <span class="Constant">0/console</span>, env
  <span class="Comment"># never gets here</span>
]

<span class="muData">container</span> programming-environment-data [
  sandbox:address:sandbox-data  <span class="Comment"># list of sandboxes, from top to bottom</span>
]

<span class="muData">container</span> sandbox-data [
  data:address:array:character
  response:address:array:character
  expected-response:address:array:character
  <span class="Comment"># coordinates to track clicks</span>
  starting-row-on-screen:number
  code-ending-row-on-screen:number  <span class="Comment"># past end of code</span>
  response-starting-row-on-screen:number
  screen:address:screen  <span class="Comment"># prints in the sandbox go here</span>
  next-sandbox:address:sandbox-data
]

<span class="muScenario">scenario</span> run-and-show-results [
  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
  <span class="Comment"># recipe editor is empty</span>
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
  <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[divide-with-remainder 11, 3]</span>
  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
  <span class="Comment"># run the code in the editors</span>
  assume-console [
    press F4
  ]
  run [
    event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
  ]
  <span class="Comment"># check that screen prints the results</span>
  screen-should-contain [
   <span class="Constant"> .                                                                                 run (F4)           .</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
<span class="Constant">    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                x.</span>
   <span class="Constant"> .                                                  ┊divide-with-remainder 11, 3                      .</span>
   <span class="Constant"> .                                                  ┊3                                                .</span>
   <span class="Constant"> .                                                  ┊2                                                .</span>
   <span class="Constant"> .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
  ]
  screen-should-contain-in-color <span class="Constant">7/white</span>, [
   <span class="Constant"> .                                                                                                    .</span>
   <span class="Constant"> .                                                                                                    .</span>
   <span class="Constant"> .                                                                                                    .</span>
   <span class="Constant"> .                                                                                                    .</span>
   <span class="Constant"> .                                                   divide-with-remainder 11, 3                      .</span>
   <span class="Constant"> .                                                                                                    .</span>
   <span class="Constant"> .                                                                                                    .</span>
   <span class="Constant"> .                                                                                                    .</span>
   <span class="Constant"> .                                                                                                    .</span>
  ]
  screen-should-contain-in-color <span class="Constant">245/grey</span>, [
   <span class="Constant"> .                                                                                                    .</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
<span class="Constant">    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                x.</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
   <span class="Constant"> .                                                  ┊3                                                .</span>
   <span class="Constant"> .                                                  ┊2                                                .</span>
   <span class="Constant"> .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
  ]
  <span class="Comment"># run another command</span>
  assume-console [
    left-click <span class="Constant">1</span>, <span class="Constant">80</span>
    type <span class="Constant">[add 2, 2]</span>
    press F4
  ]
  run [
    event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
  ]
  <span class="Comment"># check that screen prints the results</span>
  screen-should-contain [
   <span class="Constant"> .                                                                                 run (F4)           .</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
<span class="Constant">    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                x.</span>
   <span class="Constant"> .                                                  ┊add 2, 2                                         .</span>
   <span class="Constant"> .                                                  ┊4                                                .</span>
   <span class="Constant"> .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                x.</span>
   <span class="Constant"> .                                                  ┊divide-with-remainder 11, 3                      .</span>
   <span class="Constant"> .                                                  ┊3                                                .</span>
   <span class="Constant"> .                                                  ┊2                                                .</span>
   <span class="Constant"> .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
  ]
]

<span class="muRecipe">after</span> <span class="Constant">&lt;global-keypress&gt;</span> [
  <span class="Comment"># F4? load all code and run all sandboxes.</span>
  <span class="Delimiter">{</span>
    do-run?:boolean<span class="Special"> &lt;- </span>equal *k, <span class="Constant">65532/F4</span>
    <span class="muControl">break-unless</span> do-run?
<span class="CommentedCode">#?     $log [F4 pressed]</span>
    status:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[running...  ]</span>
    screen<span class="Special"> &lt;- </span>update-status screen, status, <span class="Constant">245/grey</span>
    error?:boolean, env, screen<span class="Special"> &lt;- </span>run-sandboxes env, screen
    <span class="Comment"># F4 might update warnings and results on both sides</span>
    screen<span class="Special"> &lt;- </span>render-all screen, env
    <span class="Delimiter">{</span>
      <span class="muControl">break-if</span> error?
      status:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[            ]</span>
      screen<span class="Special"> &lt;- </span>update-status screen, status, <span class="Constant">245/grey</span>
    <span class="Delimiter">}</span>
    screen<span class="Special"> &lt;- </span>update-cursor screen, recipes, current-sandbox, *sandbox-in-focus?
    <span class="muControl">loop</span> <span class="Constant">+next-event:label</span>
  <span class="Delimiter">}</span>
]

<span class="muRecipe">recipe</span> run-sandboxes env:address:programming-environment-data, screen:address:screen<span class="muRecipe"> -&gt; </span>errors-found?:boolean, env:address:programming-environment-data, screen:address:screen [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  errors-found?:boolean, env, screen<span class="Special"> &lt;- </span>update-recipes env, screen
  <span class="muControl">reply-if</span> errors-found?
  <span class="Comment"># check contents of right editor (sandbox)</span>
  current-sandbox:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
  <span class="Delimiter">{</span>
    sandbox-contents:address:array:character<span class="Special"> &lt;- </span>editor-contents current-sandbox
    <span class="muControl">break-unless</span> sandbox-contents
    <span class="Comment"># if contents exist, first save them</span>
    <span class="Comment"># run them and turn them into a new sandbox-data</span>
    new-sandbox:address:sandbox-data<span class="Special"> &lt;- </span>new <span class="Constant">sandbox-data:type</span>
    data:address:address:array:character<span class="Special"> &lt;- </span>get-address *new-sandbox, <span class="Constant">data:offset</span>
    *data<span class="Special"> &lt;- </span>copy sandbox-contents
    <span class="Comment"># push to head of sandbox list</span>
    dest:address:address:sandbox-data<span class="Special"> &lt;- </span>get-address *env, <span class="Constant">sandbox:offset</span>
    next:address:address:sandbox-data<span class="Special"> &lt;- </span>get-address *new-sandbox, <span class="Constant">next-sandbox:offset</span>
    *next<span class="Special"> &lt;- </span>copy *dest
    *dest<span class="Special"> &lt;- </span>copy new-sandbox
    <span class="Comment"># clear sandbox editor</span>
    init:address:address:duplex-list:character<span class="Special"> &lt;- </span>get-address *current-sandbox, <span class="Constant">data:offset</span>
    *init<span class="Special"> &lt;- </span>push <span class="Constant">167/§</span>, <span class="Constant">0/tail</span>
    top-of-screen:address:address:duplex-list:character<span class="Special"> &lt;- </span>get-address *current-sandbox, <span class="Constant">top-of-screen:offset</span>
    *top-of-screen<span class="Special"> &lt;- </span>copy *init
  <span class="Delimiter">}</span>
  <span class="Comment"># save all sandboxes before running, just in case we die when running</span>
  save-sandboxes env
  <span class="Comment"># run all sandboxes</span>
  curr:address:sandbox-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> curr
    curr<span class="Special"> &lt;- </span>update-sandbox curr
    curr<span class="Special"> &lt;- </span>get *curr, <span class="Constant">next-sandbox:offset</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  errors-found?<span class="Special"> &lt;- </span>copy <span class="Constant">0/false</span>
]

<span class="Comment"># copy code from recipe editor, persist, load into mu</span>
<span class="Comment"># replaced in a later layer (whereupon errors-found? will actually be set)</span>
<span class="muRecipe">recipe</span> update-recipes env:address:programming-environment-data, screen:address:screen<span class="muRecipe"> -&gt; </span>errors-found?:boolean, env:address:programming-environment-data, screen:address:screen [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  recipes:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipes:offset</span>
  in:address:array:character<span class="Special"> &lt;- </span>editor-contents recipes
  save <span class="Constant">[recipes.mu]</span>, in  <span class="Comment"># newlayer: persistence</span>
  reload in
  errors-found?<span class="Special"> &lt;- </span>copy <span class="Constant">0/false</span>
]

<span class="Comment"># replaced in a later layer</span>
<span class="muRecipe">recipe</span> update-sandbox sandbox:address:sandbox-data<span class="muRecipe"> -&gt; </span>sandbox:address:sandbox-data [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  data:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
  response:address:address:array:character<span class="Special"> &lt;- </span>get-address *sandbox, <span class="Constant">response:offset</span>
  fake-screen:address:address:screen<span class="Special"> &lt;- </span>get-address *sandbox, <span class="Constant">screen:offset</span>
  *response, _, *fake-screen<span class="Special"> &lt;- </span>run-interactive data
]

<span class="muRecipe">recipe</span> update-status screen:address:screen, msg:address:array:character, color:number<span class="muRecipe"> -&gt; </span>screen:address:screen [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  screen<span class="Special"> &lt;- </span>move-cursor screen, <span class="Constant">0</span>, <span class="Constant">2</span>
  screen<span class="Special"> &lt;- </span>print screen, msg, color, <span class="Constant">238/grey/background</span>
]

<span class="muRecipe">recipe</span> save-sandboxes env:address:programming-environment-data [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  current-sandbox:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
  <span class="Comment"># first clear previous versions, in case we deleted some sandbox</span>
  $system <span class="Constant">[rm lesson/[0-9]</span>* &gt;/dev/null <span class="Constant">2</span>&gt;/dev/null]  <span class="Comment"># some shells can't handle '&gt;&amp;'</span>
  curr:address:sandbox-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
  suffix:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[.out]</span>
  idx:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> curr
    data:address:array:character<span class="Special"> &lt;- </span>get *curr, <span class="Constant">data:offset</span>
    filename:address:array:character<span class="Special"> &lt;- </span>to-text idx
    save filename, data
    <span class="Delimiter">{</span>
      expected-response:address:array:character<span class="Special"> &lt;- </span>get *curr, <span class="Constant">expected-response:offset</span>
      <span class="muControl">break-unless</span> expected-response
      filename<span class="Special"> &lt;- </span>append filename, suffix
      save filename, expected-response
    <span class="Delimiter">}</span>
    idx<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
    curr<span class="Special"> &lt;- </span>get *curr, <span class="Constant">next-sandbox:offset</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muRecipe">recipe!</span> render-sandbox-side screen:address:screen, env:address:programming-environment-data<span class="muRecipe"> -&gt; </span>screen:address:screen [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
<span class="CommentedCode">#?   $log [render sandbox side]</span>
  trace <span class="Constant">11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render sandbox side]</span>
  current-sandbox:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
  left:number<span class="Special"> &lt;- </span>get *current-sandbox, <span class="Constant">left:offset</span>
  right:number<span class="Special"> &lt;- </span>get *current-sandbox, <span class="Constant">right:offset</span>
  row:number, column:number, screen, current-sandbox<span class="Special"> &lt;- </span>render screen, current-sandbox
  clear-screen-from screen, row, column, left, right
  row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
  draw-horizontal screen, row, left, right, <span class="Constant">9473/horizontal-double</span>
  sandbox:address:sandbox-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
  row, screen<span class="Special"> &lt;- </span>render-sandboxes screen, sandbox, left, right, row
  clear-rest-of-screen screen, row, left, left, right
]

<span class="muRecipe">recipe</span> render-sandboxes screen:address:screen, sandbox:address:sandbox-data, left:number, right:number, row:number<span class="muRecipe"> -&gt; </span>row:number, screen:address:screen, sandbox:address:sandbox-data [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
<span class="CommentedCode">#?   $log [render sandbox]</span>
  <span class="muControl">reply-unless</span> sandbox
  screen-height:number<span class="Special"> &lt;- </span>screen-height screen
  at-bottom?:boolean<span class="Special"> &lt;- </span>greater-or-equal row, screen-height
  <span class="muControl">reply-if</span> at-bottom?:boolean
  <span class="Comment"># render sandbox menu</span>
  row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
  screen<span class="Special"> &lt;- </span>move-cursor screen, row, left
  clear-line-delimited screen, left, right
  print screen, <span class="Constant">120/x</span>, <span class="Constant">245/grey</span>
  <span class="Comment"># save menu row so we can detect clicks to it later</span>
  starting-row:address:number<span class="Special"> &lt;- </span>get-address *sandbox, <span class="Constant">starting-row-on-screen:offset</span>
  *starting-row<span class="Special"> &lt;- </span>copy row
  <span class="Comment"># render sandbox contents</span>
  row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
  screen<span class="Special"> &lt;- </span>move-cursor screen, row, left
  sandbox-data:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
  row, screen<span class="Special"> &lt;- </span>render-code screen, sandbox-data, left, right, row
  code-ending-row:address:number<span class="Special"> &lt;- </span>get-address *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>
  *code-ending-row<span class="Special"> &lt;- </span>copy row
  <span class="Comment"># render sandbox warnings, screen or response, in that order</span>
  response-starting-row:address:number<span class="Special"> &lt;- </span>get-address *sandbox, <span class="Constant">response-starting-row-on-screen:offset</span>
  sandbox-response:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">response:offset</span>
<span class="Constant">  &lt;render-sandbox-results&gt;</span>
  <span class="Delimiter">{</span>
    sandbox-screen:address:screen<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">screen:offset</span>
    empty-screen?:boolean<span class="Special"> &lt;- </span>fake-screen-is-empty? sandbox-screen
    <span class="muControl">break-if</span> empty-screen?
    row, screen<span class="Special"> &lt;- </span>render-screen screen, sandbox-screen, left, right, row
  <span class="Delimiter">}</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> empty-screen?
    *response-starting-row<span class="Special"> &lt;- </span>copy row
<span class="Constant">    &lt;render-sandbox-response&gt;</span>
    row, screen<span class="Special"> &lt;- </span>render screen, sandbox-response, left, right, <span class="Constant">245/grey</span>, row
  <span class="Delimiter">}</span>
<span class="Constant">  +render-sandbox-end</span>
  at-bottom?:boolean<span class="Special"> &lt;- </span>greater-or-equal row, screen-height
  <span class="muControl">reply-if</span> at-bottom?
  <span class="Comment"># draw solid line after sandbox</span>
  draw-horizontal screen, row, left, right, <span class="Constant">9473/horizontal-double</span>
  <span class="Comment"># draw next sandbox</span>
  next-sandbox:address:sandbox-data<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">next-sandbox:offset</span>
  row, screen<span class="Special"> &lt;- </span>render-sandboxes screen, next-sandbox, left, right, row
]

<span class="Comment"># assumes programming environment has no sandboxes; restores them from previous session</span>
<span class="muRecipe">recipe</span> restore-sandboxes env:address:programming-environment-data<span class="muRecipe"> -&gt; </span>env:address:programming-environment-data [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Comment"># read all scenarios, pushing them to end of a list of scenarios</span>
  suffix:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[.out]</span>
  idx:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  curr:address:address:sandbox-data<span class="Special"> &lt;- </span>get-address *env, <span class="Constant">sandbox:offset</span>
  <span class="Delimiter">{</span>
    filename:address:array:character<span class="Special"> &lt;- </span>to-text idx
    contents:address:array:character<span class="Special"> &lt;- </span>restore filename
    <span class="muControl">break-unless</span> contents  <span class="Comment"># stop at first error; assuming file didn't exist</span>
    <span class="Comment"># create new sandbox for file</span>
    *curr<span class="Special"> &lt;- </span>new <span class="Constant">sandbox-data:type</span>
    data:address:address:array:character<span class="Special"> &lt;- </span>get-address **curr, <span class="Constant">data:offset</span>
    *data<span class="Special"> &lt;- </span>copy contents
    <span class="Comment"># restore expected output for sandbox if it exists</span>
    <span class="Delimiter">{</span>
      filename<span class="Special"> &lt;- </span>append filename, suffix
      contents<span class="Special"> &lt;- </span>restore filename
      <span class="muControl">break-unless</span> contents
      expected-response:address:address:array:character<span class="Special"> &lt;- </span>get-address **curr, <span class="Constant">expected-response:offset</span>
      *expected-response<span class="Special"> &lt;- </span>copy contents
    <span class="Delimiter">}</span>
<span class="Constant">    +continue</span>
    idx<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
    curr<span class="Special"> &lt;- </span>get-address **curr, <span class="Constant">next-sandbox:offset</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="Comment"># print the fake sandbox screen to 'screen' with appropriate delimiters</span>
<span class="Comment"># leave cursor at start of next line</span>
<span class="muRecipe">recipe</span> render-screen screen:address:screen, sandbox-screen:address:screen, left:number, right:number, row:number<span class="muRecipe"> -&gt; </span>row:number, screen:address:screen [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="muControl">reply-unless</span> sandbox-screen
  <span class="Comment"># print 'screen:'</span>
  header:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[screen:]</span>
  row<span class="Special"> &lt;- </span>render screen, header, left, right, <span class="Constant">245/grey</span>, row
  screen<span class="Special"> &lt;- </span>move-cursor screen, row, left
  <span class="Comment"># start printing sandbox-screen</span>
  column:number<span class="Special"> &lt;- </span>copy left
  s-width:number<span class="Special"> &lt;- </span>screen-width sandbox-screen
  s-height:number<span class="Special"> &lt;- </span>screen-height sandbox-screen
  buf:address:array:screen-cell<span class="Special"> &lt;- </span>get *sandbox-screen, <span class="Constant">data:offset</span>
  stop-printing:number<span class="Special"> &lt;- </span>add left, s-width, <span class="Constant">3</span>
  max-column:number<span class="Special"> &lt;- </span>min stop-printing, right
  i:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  len:number<span class="Special"> &lt;- </span>length *buf
  screen-height:number<span class="Special"> &lt;- </span>screen-height screen
  <span class="Delimiter">{</span>
    done?:boolean<span class="Special"> &lt;- </span>greater-or-equal i, len
    <span class="muControl">break-if</span> done?
    done?<span class="Special"> &lt;- </span>greater-or-equal row, screen-height
    <span class="muControl">break-if</span> done?
    column<span class="Special"> &lt;- </span>copy left
    screen<span class="Special"> &lt;- </span>move-cursor screen, row, column
    <span class="Comment"># initial leader for each row: two spaces and a '.'</span>
    print screen, <span class="Constant">32/space</span>, <span class="Constant">245/grey</span>
    print screen, <span class="Constant">32/space</span>, <span class="Constant">245/grey</span>
    print screen, <span class="Constant">46/full-stop</span>, <span class="Constant">245/grey</span>
    column<span class="Special"> &lt;- </span>add left, <span class="Constant">3</span>
    <span class="Delimiter">{</span>
      <span class="Comment"># print row</span>
      row-done?:boolean<span class="Special"> &lt;- </span>greater-or-equal column, max-column
      <span class="muControl">break-if</span> row-done?
      curr:screen-cell<span class="Special"> &lt;- </span>index *buf, i
      c:character<span class="Special"> &lt;- </span>get curr, <span class="Constant">contents:offset</span>
      color:number<span class="Special"> &lt;- </span>get curr, <span class="Constant">color:offset</span>
      <span class="Delimiter">{</span>
        <span class="Comment"># damp whites down to grey</span>
        white?:boolean<span class="Special"> &lt;- </span>equal color, <span class="Constant">7/white</span>
        <span class="muControl">break-unless</span> white?
        color<span class="Special"> &lt;- </span>copy <span class="Constant">245/grey</span>
      <span class="Delimiter">}</span>
      print screen, c, color
      column<span class="Special"> &lt;- </span>add column, <span class="Constant">1</span>
      i<span class="Special"> &lt;- </span>add i, <span class="Constant">1</span>
      <span class="muControl">loop</span>
    <span class="Delimiter">}</span>
    <span class="Comment"># print final '.'</span>
    print screen, <span class="Constant">46/full-stop</span>, <span class="Constant">245/grey</span>
    column<span class="Special"> &lt;- </span>add column, <span class="Constant">1</span>
    <span class="Delimiter">{</span>
      <span class="Comment"># clear rest of current line</span>
      line-done?:boolean<span class="Special"> &lt;- </span>greater-than column, right
      <span class="muControl">break-if</span> line-done?
      print screen, <span class="Constant">32/space</span>
      column<span class="Special"> &lt;- </span>add column, <span class="Constant">1</span>
      <span class="muControl">loop</span>
    <span class="Delimiter">}</span>
    row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muScenario">scenario</span> run-updates-results [
  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
  assume-screen <span class="Constant">100/width</span>, <span class="Constant">12/height</span>
  <span class="Comment"># define a recipe (no indent for the 'add' line below so column numbers are more obvious)</span>
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
<span class="Constant">recipe foo [</span>
<span class="Constant">z:number &lt;- add 2, 2</span>
<span class="Constant">reply z</span>
<span class="Constant">]</span>]
  <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
  <span class="Comment"># run the code in the editors</span>
  assume-console [
    press F4
  ]
  event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
  screen-should-contain [
   <span class="Constant"> .                                                                                 run (F4)           .</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
   <span class="Constant"> .recipe foo [                                      ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .z:number &lt;- add 2, 2                              ┊                                                x.</span>
   <span class="Constant"> .reply z                                           ┊foo                                              .</span>
   <span class="Constant"> .]                                                 ┊4                                                .</span>
<span class="Constant">    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
  ]
  <span class="Comment"># make a change (incrementing one of the args to 'add'), then rerun</span>
  assume-console [
    left-click <span class="Constant">3</span>, <span class="Constant">28</span>  <span class="Comment"># one past the value of the second arg</span>
    press backspace
    type <span class="Constant">[3]</span>
    press F4
  ]
  run [
    event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
  ]
  <span class="Comment"># check that screen updates the result on the right</span>
  screen-should-contain [
   <span class="Constant"> .                                                                                 run (F4)           .</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
   <span class="Constant"> .recipe foo [                                      ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .z:number &lt;- add 2, 3                              ┊                                                x.</span>
   <span class="Constant"> .reply z                                           ┊foo                                              .</span>
   <span class="Constant"> .]                                                 ┊5                                                .</span>
<span class="Constant">    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
  ]
]

<span class="muScenario">scenario</span> run-instruction-manages-screen-per-sandbox [
  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
  assume-screen <span class="Constant">100/width</span>, <span class="Constant">20/height</span>
  <span class="Comment"># left editor is empty</span>
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
  <span class="Comment"># right editor contains an instruction</span>
  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[print-integer screen, 4]</span>
  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
  <span class="Comment"># run the code in the editor</span>
  assume-console [
    press F4
  ]
  run [
    event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
  ]
  <span class="Comment"># check that it prints a little toy screen</span>
  screen-should-contain [
   <span class="Constant"> .                                                                                 run (F4)           .</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
<span class="Constant">    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                x.</span>
   <span class="Constant"> .                                                  ┊print-integer screen, 4                          .</span>
   <span class="Constant"> .                                                  ┊screen:                                          .</span>
   <span class="Constant"> .                                                  ┊  .4                             .               .</span>
   <span class="Constant"> .                                                  ┊  .                              .               .</span>
   <span class="Constant"> .                                                  ┊  .                              .               .</span>
   <span class="Constant"> .                                                  ┊  .                              .               .</span>
   <span class="Constant"> .                                                  ┊  .                              .               .</span>
   <span class="Constant"> .                                                  ┊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━.</span>
   <span class="Constant"> .                                                  ┊                                                 .</span>
  ]
]

<span class="muRecipe">recipe</span> editor-contents editor:address:editor-data<span class="muRecipe"> -&gt; </span>result:address:array:character [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  buf:address:buffer<span class="Special"> &lt;- </span>new-buffer <span class="Constant">80</span>
  curr:address:duplex-list:character<span class="Special"> &lt;- </span>get *editor, <span class="Constant">data:offset</span>
  <span class="Comment"># skip § sentinel</span>
  assert curr, <span class="Constant">[editor without data is illegal; must have at least a sentinel]</span>
  curr<span class="Special"> &lt;- </span>next curr
  <span class="muControl">reply-unless</span> curr, <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> curr
    c:character<span class="Special"> &lt;- </span>get *curr, <span class="Constant">value:offset</span>
    buf<span class="Special"> &lt;- </span>append buf, c
    curr<span class="Special"> &lt;- </span>next curr
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  result<span class="Special"> &lt;- </span>buffer-to-array buf
]

<span class="muScenario">scenario</span> editor-provides-edited-contents [
  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
  assume-console [
    left-click <span class="Constant">1</span>, <span class="Constant">2</span>
    type <span class="Constant">[def]</span>
  ]
  run [
    editor-event-loop screen:address:screen, console:address:console, <span class="Constant">2</span>:address:editor-data
    <span class="Constant">3</span>:address:array:character<span class="Special"> &lt;- </span>editor-contents <span class="Constant">2</span>:address:editor-data
    <span class="Constant">4</span>:array:character<span class="Special"> &lt;- </span>copy *<span class="Constant">3</span>:address:array:character
  ]
  memory-should-contain [
    <span class="Constant">4</span>:array:character<span class="Special"> &lt;- </span><span class="Constant">[abdefc]</span>
  ]
]
</pre>
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<!-- vim: set foldmethod=manual : -->
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