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<span class="Comment">//: Clean syntax to manipulate and check the screen in scenarios.</span>
<span class="Comment">//: Instructions 'assume-screen' and 'screen-should-contain' implicitly create</span>
<span class="Comment">//: a variable called 'screen' that is accessible to later instructions in the</span>
<span class="Comment">//: scenario. 'screen-should-contain' can check unicode characters in the fake</span>
<span class="Comment">//: screen</span>

<span class="Comment">//: first make sure we don't mangle these functions in other transforms</span>
<span class="Delimiter">:(before &quot;End initialize_transform_rewrite_literal_string_to_text()&quot;)</span>
recipes_taking_literal_strings<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><span class="Constant">&quot;screen-should-contain&quot;</span><span class="Delimiter">);</span>
recipes_taking_literal_strings<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><span class="Constant">&quot;screen-should-contain-in-color&quot;</span><span class="Delimiter">);</span>

<span class="Delimiter">:(scenarios run_mu_scenario)</span>
<span class="Delimiter">:(scenario screen_in_scenario)</span>
<span class="muScenario">scenario</span> screen-in-scenario [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
  ]
  screen-should-contain [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>a    <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="Comment"># checks are inside scenario</span>

<span class="Delimiter">:(scenario screen_in_scenario_unicode)</span>
<span class="Comment"># screen-should-contain can check unicode characters in the fake screen</span>
<span class="muScenario">scenario</span> screen-in-scenario-unicode [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">lambda</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">955</span>/greek-small-lambda
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> lambda
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
  ]
  screen-should-contain [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>λa   <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="Comment"># checks are inside scenario</span>

<span class="Delimiter">:(scenario screen_in_scenario_color)</span>
<span class="muScenario">scenario</span> screen-in-scenario-color [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">lambda</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">955</span>/greek-small-lambda
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> lambda<span class="Delimiter">,</span> <span class="Constant">1</span>/red
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a<span class="Delimiter">,</span> <span class="Constant">7</span>/white
  ]
  <span class="Comment"># screen-should-contain shows everything</span>
  screen-should-contain [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>λa   <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
  <span class="Comment"># screen-should-contain-in-color filters out everything except the given</span>
  <span class="Comment"># color, all you see is the 'a' in white.</span>
  screen-should-contain-in-color <span class="Constant">7</span>/white<span class="Delimiter">,</span> [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span> a   <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
  <span class="Comment"># ..and the λ in red.</span>
  screen-should-contain-in-color <span class="Constant">1</span>/red<span class="Delimiter">,</span> [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>λ    <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="Comment"># checks are inside scenario</span>

<span class="Delimiter">:(scenario screen_in_scenario_error)</span>
<span class="Special">% Scenario_testing_scenario = true;</span>
<span class="Special">% Hide_errors = true;</span>
<span class="muScenario">scenario</span> screen-in-scenario-error [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
  ]
  screen-should-contain [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>b    <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="traceContains">+error: expected screen location (0, 0) to contain 98 ('b') instead of 97 ('a')</span>

<span class="Delimiter">:(scenario screen_in_scenario_color_error)</span>
<span class="Special">% Scenario_testing_scenario = true;</span>
<span class="Special">% Hide_errors = true;</span>
<span class="Comment"># screen-should-contain can check unicode characters in the fake screen</span>
<span class="muScenario">scenario</span> screen-in-scenario-color-error [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a<span class="Delimiter">,</span> <span class="Constant">1</span>/red
  ]
  screen-should-contain-in-color <span class="Constant">2</span>/green<span class="Delimiter">,</span> [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>a    <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="traceContains">+error: expected screen location (0, 0) to be in color 2 instead of 1</span>

<span class="Delimiter">:(scenarios run)</span>
<span class="Delimiter">:(scenario convert_names_does_not_fail_when_mixing_special_names_and_numeric_locations)</span>
<span class="Special">% Scenario_testing_scenario = true;</span>
<span class="muRecipe">def</span> main [
  <span class="Normal">screen</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:num
]
<span class="traceAbsent">-error: mixing variable names and numeric addresses in main</span>
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenarios run_mu_scenario)</span>

<span class="Comment">//: It's easier to implement assume-screen and other similar scenario-only</span>
<span class="Comment">//: primitives if they always write to a fixed location. So we'll assign a</span>
<span class="Comment">//: single fixed location for the per-scenario screen, keyboard, file system,</span>
<span class="Comment">//: etc. Carve space for these fixed locations out of the reserved-for-test</span>
<span class="Comment">//: locations.</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span class="Normal">extern</span> <span class="Normal">const</span> <span class="Normal">int</span> Max_variables_in_scenarios = Reserved_for_tests-<span class="Constant">100</span><span class="Delimiter">;</span>
<span class="Normal">int</span> Next_predefined_global_for_scenarios = Max_variables_in_scenarios<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Setup&quot;)</span>
assert<span class="Delimiter">(</span>Next_predefined_global_for_scenarios &lt; Reserved_for_tests<span class="Delimiter">);</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span class="Comment">// Scenario Globals.</span>
<span class="Normal">extern</span> <span class="Normal">const</span> <span class="Normal">int</span> SCREEN = Next_predefined_global_for_scenarios++<span class="Delimiter">;</span>
<span class="Comment">// End Scenario Globals.</span>

<span class="Comment">//: give 'screen' a fixed location in scenarios</span>
<span class="Delimiter">:(before &quot;End Special Scenario Variable Names(r)&quot;)</span>
Name[r][<span class="Constant">&quot;screen&quot;</span>] = SCREEN<span class="Delimiter">;</span>
<span class="Comment">//: make 'screen' always a raw location in scenarios</span>
<span class="Delimiter">:(before &quot;End is_special_name Cases&quot;)</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>

<span class="Delimiter">:(before &quot;End Rewrite Instruction(curr, recipe result)&quot;)</span>
<span class="Comment">// rewrite `assume-screen width, height` to</span>
<span class="Comment">// `screen:&amp;:screen &lt;- new-fake-screen width, height`</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;assume-screen&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  curr<span class="Delimiter">.</span>name = <span class="Constant">&quot;new-fake-screen&quot;</span><span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    raise &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: 'assume-screen' has no products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!starts_with<span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;scenario_&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: 'assume-screen' can't be called here, only in scenarios</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  <span class="Normal">else</span> <span class="Delimiter">{</span>
    assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
    curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;screen:&amp;:screen/raw&quot;</span><span class="Delimiter">));</span>
    curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>set_value<span class="Delimiter">(</span>SCREEN<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario assume_screen_shows_up_in_errors)</span>
<span class="Special">% Hide_errors = true;</span>
<span class="muScenario">scenario</span> assume-screen-shows-up-in-errors [
  assume-screen width<span class="Delimiter">,</span> <span class="Constant">5</span>
]
<span class="traceContains">+error: scenario_assume-screen-shows-up-in-errors: missing type for 'width' in 'assume-screen width, 5'</span>

<span class="Comment">//: screen-should-contain is a regular instruction</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
SCREEN_SHOULD_CONTAIN<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen-should-contain&quot;</span><span class="Delimiter">,</span> SCREEN_SHOULD_CONTAIN<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> SCREEN_SHOULD_CONTAIN: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'screen-should-contain' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'screen-should-contain' should be a literal string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> SCREEN_SHOULD_CONTAIN: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!Passed<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
  check_screen<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> -<span class="Constant">1</span><span class="Delimiter">);</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
SCREEN_SHOULD_CONTAIN_IN_COLOR<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen-should-contain-in-color&quot;</span><span class="Delimiter">,</span> SCREEN_SHOULD_CONTAIN_IN_COLOR<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> SCREEN_SHOULD_CONTAIN_IN_COLOR: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'screen-should-contain-in-color' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'screen-should-contain-in-color' should be a number (color code), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'screen-should-contain-in-color' should be a literal string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> SCREEN_SHOULD_CONTAIN_IN_COLOR: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!Passed<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
  check_screen<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span class="Comment">// scan an array of characters in a unicode-aware, bounds-checked manner</span>
<span class="Normal">struct</span> raw_string_stream <span class="Delimiter">{</span>
  <span class="Normal">int</span> index<span class="Delimiter">;</span>
  <span class="Normal">const</span> <span class="Normal">int</span> max<span class="Delimiter">;</span>
  <span class="Normal">const</span> <span class="Normal">char</span>* buf<span class="Delimiter">;</span>

  raw_string_stream<span class="Delimiter">(</span><span class="Normal">const</span> string&amp;<span class="Delimiter">);</span>
  <span class="Normal">uint32_t</span> get<span class="Delimiter">();</span>  <span class="Comment">// unicode codepoint</span>
  <span class="Normal">uint32_t</span> peek<span class="Delimiter">();</span>  <span class="Comment">// unicode codepoint</span>
  <span class="Normal">bool</span> at_end<span class="Delimiter">()</span> <span class="Normal">const</span><span class="Delimiter">;</span>
  <span class="Normal">void</span> skip_whitespace_and_comments<span class="Delimiter">();</span>
<span class="Delimiter">};</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> check_screen<span class="Delimiter">(</span><span class="Normal">const</span> string&amp; expected_contents<span class="Delimiter">,</span> <span class="Normal">const</span> <span class="Normal">int</span> color<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">int</span> screen_location = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> SCREEN<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> data_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;data&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>data_offset &gt;= <span class="Constant">0</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_data_location = screen_location+data_offset<span class="Delimiter">;</span>  <span class="Comment">// type: address:array:character</span>
  <span class="Normal">int</span> screen_data_start = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_data_location<span class="Delimiter">)</span> + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// type: array:character</span>
  <span class="Normal">int</span> width_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;num-columns&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_width = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_location+width_offset<span class="Delimiter">);</span>
  <span class="Normal">int</span> height_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;num-rows&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_height = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_location+height_offset<span class="Delimiter">);</span>
  raw_string_stream cursor<span class="Delimiter">(</span>expected_contents<span class="Delimiter">);</span>
  <span class="Comment">// todo: too-long expected_contents should fail</span>
  <span class="Normal">int</span> addr = screen_data_start+<span class="Comment">/*</span><span class="Comment">skip length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> row = <span class="Constant">0</span><span class="Delimiter">;</span>  row &lt; screen_height<span class="Delimiter">;</span>  ++row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    cursor<span class="Delimiter">.</span>skip_whitespace_and_comments<span class="Delimiter">();</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>at_end<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'.'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      raise &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: each row of the expected screen should start with a '.'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
      <span class="Identifier">return</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> column = <span class="Constant">0</span><span class="Delimiter">;</span>  column &lt; screen_width<span class="Delimiter">;</span>  ++column<span class="Delimiter">,</span> addr+= <span class="Comment">/*</span><span class="Comment">size of screen-cell</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Normal">const</span> <span class="Normal">int</span> cell_color_offset = <span class="Constant">1</span><span class="Delimiter">;</span>
      <span class="Normal">uint32_t</span> curr = cursor<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> == <span class="Constant">0</span> &amp;&amp; isspace<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>curr == <span class="Constant">' '</span> &amp;&amp; color != -<span class="Constant">1</span> &amp;&amp; color != get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
        <span class="Comment">// filter out other colors</span>
        <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> != <span class="Constant">0</span> &amp;&amp; get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> == curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        <span class="Normal">if</span> <span class="Delimiter">(</span>color == -<span class="Constant">1</span> || color == get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
        <span class="Comment">// contents match but color is off</span>
        <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
          <span class="Comment">// genuine test in a .mu file</span>
          raise &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;, address &quot;</span> &lt;&lt; addr &lt;&lt; <span class="Constant">&quot;, value &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;) to be in color &quot;</span> &lt;&lt; color &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
          dump_screen<span class="Delimiter">();</span>
        <span class="Delimiter">}</span>
        <span class="Normal">else</span> <span class="Delimiter">{</span>
          <span class="Comment">// just testing check_screen</span>
          raise &lt;&lt; <span class="Constant">&quot;expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to be in color &quot;</span> &lt;&lt; color &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
        <span class="Delimiter">}</span>
        <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
        <span class="Identifier">return</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>

      <span class="Comment">// really a mismatch</span>
      <span class="Comment">// can't print multi-byte unicode characters in errors just yet. not very useful for debugging anyway.</span>
      <span class="Normal">char</span> expected_pretty[<span class="Constant">10</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>curr &lt; <span class="Constant">256</span> &amp;&amp; !iscntrl<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
        <span class="Comment">// &quot; ('&lt;curr&gt;')&quot;</span>
        expected_pretty[<span class="Constant">0</span>] = <span class="Constant">' '</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">1</span>] = <span class="Constant">'('</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">2</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">3</span>] = <span class="Normal">static_cast</span>&lt;<span class="Normal">unsigned</span> <span class="Normal">char</span>&gt;<span class="Delimiter">(</span>curr<span class="Delimiter">),</span> expected_pretty[<span class="Constant">4</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">5</span>] = <span class="Constant">')'</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">6</span>] = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
      <span class="Normal">char</span> actual_pretty[<span class="Constant">10</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> &lt; <span class="Constant">256</span> &amp;&amp; !iscntrl<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
        <span class="Comment">// &quot; ('&lt;curr&gt;')&quot;</span>
        actual_pretty[<span class="Constant">0</span>] = <span class="Constant">' '</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">1</span>] = <span class="Constant">'('</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">2</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">3</span>] = <span class="Normal">static_cast</span>&lt;<span class="Normal">unsigned</span> <span class="Normal">char</span>&gt;<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)),</span> actual_pretty[<span class="Constant">4</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">5</span>] = <span class="Constant">')'</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">6</span>] = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>

      ostringstream color_phrase<span class="Delimiter">;</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>color != -<span class="Constant">1</span><span class="Delimiter">)</span> color_phrase &lt;&lt; <span class="Constant">&quot; in color &quot;</span> &lt;&lt; color<span class="Delimiter">;</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        <span class="Comment">// genuine test in a .mu file</span>
        raise &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to contain &quot;</span> &lt;&lt; curr &lt;&lt; expected_pretty &lt;&lt; color_phrase<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; actual_pretty &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
        dump_screen<span class="Delimiter">();</span>
      <span class="Delimiter">}</span>
      <span class="Normal">else</span> <span class="Delimiter">{</span>
        <span class="Comment">// just testing check_screen</span>
        raise &lt;&lt; <span class="Constant">&quot;expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to contain &quot;</span> &lt;&lt; curr &lt;&lt; expected_pretty &lt;&lt; color_phrase<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; actual_pretty &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Delimiter">}</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
      <span class="Identifier">return</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'.'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      raise &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: row &quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot; of the expected screen is too long</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
      <span class="Identifier">return</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  cursor<span class="Delimiter">.</span>skip_whitespace_and_comments<span class="Delimiter">();</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!cursor<span class="Delimiter">.</span>at_end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    raise &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen has too many rows</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

raw_string_stream::raw_string_stream<span class="Delimiter">(</span><span class="Normal">const</span> string&amp; backing<span class="Delimiter">)</span> :index<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> max<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>backing<span class="Delimiter">)),</span> buf<span class="Delimiter">(</span>backing<span class="Delimiter">.</span>c_str<span class="Delimiter">())</span> <span class="Delimiter">{}</span>

<span class="Normal">bool</span> raw_string_stream::at_end<span class="Delimiter">()</span> <span class="Normal">const</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>index &gt;= max<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>tb_utf8_char_length<span class="Delimiter">(</span>buf[index]<span class="Delimiter">)</span> &gt; max-index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;unicode string seems corrupted at index &quot;</span>&lt;&lt; index &lt;&lt; <span class="Constant">&quot; character &quot;</span> &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span>buf[index]<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">uint32_t</span> raw_string_stream::get<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>index &lt; max<span class="Delimiter">);</span>  <span class="Comment">// caller must check bounds before calling 'get'</span>
  <span class="Normal">uint32_t</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> length = tb_utf8_char_to_unicode<span class="Delimiter">(</span>&amp;result<span class="Delimiter">,</span> &amp;buf[index]<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>length != TB_EOF<span class="Delimiter">);</span>
  index += length<span class="Delimiter">;</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">uint32_t</span> raw_string_stream::peek<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>index &lt; max<span class="Delimiter">);</span>  <span class="Comment">// caller must check bounds before calling 'get'</span>
  <span class="Normal">uint32_t</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> length = tb_utf8_char_to_unicode<span class="Delimiter">(</span>&amp;result<span class="Delimiter">,</span> &amp;buf[index]<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>length != TB_EOF<span class="Delimiter">);</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">void</span> raw_string_stream::skip_whitespace_and_comments<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Normal">while</span> <span class="Delimiter">(</span>!at_end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>peek<span class="Delimiter">()))</span> get<span class="Delimiter">();</span>
    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Comment">// skip comment</span>
      get<span class="Delimiter">();</span>
      <span class="Normal">while</span> <span class="Delimiter">(</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> get<span class="Delimiter">();</span>  <span class="Comment">// implicitly also handles CRLF</span>
    <span class="Delimiter">}</span>
    <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
_DUMP_SCREEN<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;$dump-screen&quot;</span><span class="Delimiter">,</span> _DUMP_SCREEN<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> _DUMP_SCREEN: <span class="Delimiter">{</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> _DUMP_SCREEN: <span class="Delimiter">{</span>
  dump_screen<span class="Delimiter">();</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> dump_screen<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Normal">int</span> screen_location = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> SCREEN<span class="Delimiter">)</span> + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> width_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;num-columns&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_width = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_location+width_offset<span class="Delimiter">);</span>
  <span class="Normal">int</span> height_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;num-rows&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_height = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_location+height_offset<span class="Delimiter">);</span>
  <span class="Normal">int</span> data_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;data&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>data_offset &gt;= <span class="Constant">0</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_data_location = screen_location+data_offset<span class="Delimiter">;</span>  <span class="Comment">// type: address:array:character</span>
  <span class="Normal">int</span> screen_data_start = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_data_location<span class="Delimiter">)</span> + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// type: array:character</span>
  assert<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_data_start<span class="Delimiter">)</span> == screen_width*screen_height<span class="Delimiter">);</span>
  <span class="Normal">int</span> curr = screen_data_start+<span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// skip length</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> row = <span class="Constant">0</span><span class="Delimiter">;</span>  row &lt; screen_height<span class="Delimiter">;</span>  ++row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    cerr &lt;&lt; <span class="Constant">'.'</span><span class="Delimiter">;</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> col = <span class="Constant">0</span><span class="Delimiter">;</span>  col &lt; screen_width<span class="Delimiter">;</span>  ++col<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">))</span>
        cerr &lt;&lt; to_unicode<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)));</span>
      <span class="Normal">else</span>
        cerr &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
      curr += <span class="Comment">/*</span><span class="Comment">size of screen-cell</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    cerr &lt;&lt; <span class="Constant">&quot;.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>
</pre>
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<span class="Comment">//: Clean syntax to manipulate and check the screen in scenarios.</span>
<span class="Comment">//: Instructions 'assume-screen' and 'screen-should-contain' implicitly create</span>
<span class="Comment">//: a variable called 'screen' that is accessible to later instructions in the</span>
<span class="Comment">//: scenario. 'screen-should-contain' can check unicode characters in the fake</span>
<span class="Comment">//: screen</span>

<span class="Comment">//: first make sure we don't mangle these functions in other transforms</span>
<span class="Delimiter">:(before &quot;End initialize_transform_rewrite_literal_string_to_text()&quot;)</span>
recipes_taking_literal_strings<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><span class="Constant">&quot;screen-should-contain&quot;</span><span class="Delimiter">);</span>
recipes_taking_literal_strings<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><span class="Constant">&quot;screen-should-contain-in-color&quot;</span><span class="Delimiter">);</span>

<span class="Delimiter">:(scenarios run_mu_scenario)</span>
<span class="Delimiter">:(scenario screen_in_scenario)</span>
<span class="muScenario">scenario</span> screen-in-scenario [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
  ]
  screen-should-contain [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>a    <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="Comment"># checks are inside scenario</span>

<span class="Delimiter">:(scenario screen_in_scenario_unicode)</span>
<span class="Comment"># screen-should-contain can check unicode characters in the fake screen</span>
<span class="muScenario">scenario</span> screen-in-scenario-unicode [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">lambda</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">955</span>/greek-small-lambda
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> lambda
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
  ]
  screen-should-contain [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>λa   <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="Comment"># checks are inside scenario</span>

<span class="Delimiter">:(scenario screen_in_scenario_color)</span>
<span class="muScenario">scenario</span> screen-in-scenario-color [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">lambda</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">955</span>/greek-small-lambda
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> lambda<span class="Delimiter">,</span> <span class="Constant">1</span>/red
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a<span class="Delimiter">,</span> <span class="Constant">7</span>/white
  ]
  <span class="Comment"># screen-should-contain shows everything</span>
  screen-should-contain [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>λa   <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
  <span class="Comment"># screen-should-contain-in-color filters out everything except the given</span>
  <span class="Comment"># color, all you see is the 'a' in white.</span>
  screen-should-contain-in-color <span class="Constant">7</span>/white<span class="Delimiter">,</span> [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span> a   <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
  <span class="Comment"># ..and the λ in red.</span>
  screen-should-contain-in-color <span class="Constant">1</span>/red<span class="Delimiter">,</span> [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>λ    <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="Comment"># checks are inside scenario</span>

<span class="Delimiter">:(scenario screen_in_scenario_error)</span>
<span class="Special">% Scenario_testing_scenario = true;</span>
<span class="Special">% Hide_errors = true;</span>
<span class="muScenario">scenario</span> screen-in-scenario-error [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
  ]
  screen-should-contain [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>b    <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="traceContains">+error: expected screen location (0, 0) to contain 98 ('b') instead of 97 ('a')</span>

<span class="Delimiter">:(scenario screen_in_scenario_color_error)</span>
<span class="Special">% Scenario_testing_scenario = true;</span>
<span class="Special">% Hide_errors = true;</span>
<span class="Comment"># screen-should-contain can check unicode characters in the fake screen</span>
<span class="muScenario">scenario</span> screen-in-scenario-color-error [
  local-scope
  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
  run [
    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a<span class="Delimiter">,</span> <span class="Constant">1</span>/red
  ]
  screen-should-contain-in-color <span class="Constant">2</span>/green<span class="Delimiter">,</span> [
  <span class="Comment">#  01234</span>
    <span class="Delimiter">.</span>a    <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
  ]
]
<span class="traceContains">+error: expected screen location (0, 0) to be in color 2 instead of 1</span>

<span class="Delimiter">:(scenarios run)</span>
<span class="Delimiter">:(scenario convert_names_does_not_fail_when_mixing_special_names_and_numeric_locations)</span>
<span class="Special">% Scenario_testing_scenario = true;</span>
<span class="muRecipe">def</span> main [
  <span class="Normal">screen</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:num
]
<span class="traceAbsent">-error: mixing variable names and numeric addresses in main</span>
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenarios run_mu_scenario)</span>

<span class="Comment">//: It's easier to implement assume-screen and other similar scenario-only</span>
<span class="Comment">//: primitives if they always write to a fixed location. So we'll assign a</span>
<span class="Comment">//: single fixed location for the per-scenario screen, keyboard, file system,</span>
<span class="Comment">//: etc. Carve space for these fixed locations out of the reserved-for-test</span>
<span class="Comment">//: locations.</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span class="Normal">extern</span> <span class="Normal">const</span> <span class="Normal">int</span> Max_variables_in_scenarios = Reserved_for_tests-<span class="Constant">100</span><span class="Delimiter">;</span>
<span class="Normal">int</span> Next_predefined_global_for_scenarios = Max_variables_in_scenarios<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Setup&quot;)</span>
assert<span class="Delimiter">(</span>Next_predefined_global_for_scenarios &lt; Reserved_for_tests<span class="Delimiter">);</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span class="Comment">// Scenario Globals.</span>
<span class="Normal">extern</span> <span class="Normal">const</span> <span class="Normal">int</span> SCREEN = Next_predefined_global_for_scenarios++<span class="Delimiter">;</span>
<span class="Comment">// End Scenario Globals.</span>

<span class="Comment">//: give 'screen' a fixed location in scenarios</span>
<span class="Delimiter">:(before &quot;End Special Scenario Variable Names(r)&quot;)</span>
Name[r][<span class="Constant">&quot;screen&quot;</span>] = SCREEN<span class="Delimiter">;</span>
<span class="Comment">//: make 'screen' always a raw location in scenarios</span>
<span class="Delimiter">:(before &quot;End is_special_name Cases&quot;)</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>

<span class="Delimiter">:(before &quot;End Rewrite Instruction(curr, recipe result)&quot;)</span>
<span class="Comment">// rewrite `assume-screen width, height` to</span>
<span class="Comment">// `screen:&amp;:screen &lt;- new-fake-screen width, height`</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;assume-screen&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  curr<span class="Delimiter">.</span>name = <span class="Constant">&quot;new-fake-screen&quot;</span><span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    raise &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: 'assume-screen' has no products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!starts_with<span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;scenario_&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: 'assume-screen' can't be called here, only in scenarios</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  <span class="Normal">else</span> <span class="Delimiter">{</span>
    assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
    curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;screen:&amp;:screen/raw&quot;</span><span class="Delimiter">));</span>
    curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>set_value<span class="Delimiter">(</span>SCREEN<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario assume_screen_shows_up_in_errors)</span>
<span class="Special">% Hide_errors = true;</span>
<span class="muScenario">scenario</span> assume-screen-shows-up-in-errors [
  assume-screen width<span class="Delimiter">,</span> <span class="Constant">5</span>
]
<span class="traceContains">+error: scenario_assume-screen-shows-up-in-errors: missing type for 'width' in 'assume-screen width, 5'</span>

<span class="Comment">//: screen-should-contain is a regular instruction</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
SCREEN_SHOULD_CONTAIN<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen-should-contain&quot;</span><span class="Delimiter">,</span> SCREEN_SHOULD_CONTAIN<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> SCREEN_SHOULD_CONTAIN: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'screen-should-contain' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'screen-should-contain' should be a literal string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> SCREEN_SHOULD_CONTAIN: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!Passed<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
  check_screen<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> -<span class="Constant">1</span><span class="Delimiter">);</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
SCREEN_SHOULD_CONTAIN_IN_COLOR<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen-should-contain-in-color&quot;</span><span class="Delimiter">,</span> SCREEN_SHOULD_CONTAIN_IN_COLOR<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> SCREEN_SHOULD_CONTAIN_IN_COLOR: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'screen-should-contain-in-color' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'screen-should-contain-in-color' should be a number (color code), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'screen-should-contain-in-color' should be a literal string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> SCREEN_SHOULD_CONTAIN_IN_COLOR: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!Passed<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
  check_screen<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span class="Comment">// scan an array of characters in a unicode-aware, bounds-checked manner</span>
<span class="Normal">struct</span> raw_string_stream <span class="Delimiter">{</span>
  <span class="Normal">int</span> index<span class="Delimiter">;</span>
  <span class="Normal">const</span> <span class="Normal">int</span> max<span class="Delimiter">;</span>
  <span class="Normal">const</span> <span class="Normal">char</span>* buf<span class="Delimiter">;</span>

  raw_string_stream<span class="Delimiter">(</span><span class="Normal">const</span> string&amp;<span class="Delimiter">);</span>
  <span class="Normal">uint32_t</span> get<span class="Delimiter">();</span>  <span class="Comment">// unicode codepoint</span>
  <span class="Normal">uint32_t</span> peek<span class="Delimiter">();</span>  <span class="Comment">// unicode codepoint</span>
  <span class="Normal">bool</span> at_end<span class="Delimiter">()</span> <span class="Normal">const</span><span class="Delimiter">;</span>
  <span class="Normal">void</span> skip_whitespace_and_comments<span class="Delimiter">();</span>
<span class="Delimiter">};</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> check_screen<span class="Delimiter">(</span><span class="Normal">const</span> string&amp; expected_contents<span class="Delimiter">,</span> <span class="Normal">const</span> <span class="Normal">int</span> color<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">int</span> screen_location = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> SCREEN<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> data_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;data&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>data_offset &gt;= <span class="Constant">0</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_data_location = screen_location+data_offset<span class="Delimiter">;</span>  <span class="Comment">// type: address:array:character</span>
  <span class="Normal">int</span> screen_data_start = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_data_location<span class="Delimiter">)</span> + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// type: array:character</span>
  <span class="Normal">int</span> width_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;num-columns&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_width = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_location+width_offset<span class="Delimiter">);</span>
  <span class="Normal">int</span> height_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;num-rows&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_height = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_location+height_offset<span class="Delimiter">);</span>
  raw_string_stream cursor<span class="Delimiter">(</span>expected_contents<span class="Delimiter">);</span>
  <span class="Comment">// todo: too-long expected_contents should fail</span>
  <span class="Normal">int</span> addr = screen_data_start+<span class="Comment">/*</span><span class="Comment">skip length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> row = <span class="Constant">0</span><span class="Delimiter">;</span>  row &lt; screen_height<span class="Delimiter">;</span>  ++row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    cursor<span class="Delimiter">.</span>skip_whitespace_and_comments<span class="Delimiter">();</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>at_end<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'.'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      raise &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: each row of the expected screen should start with a '.'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
      <span class="Identifier">return</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> column = <span class="Constant">0</span><span class="Delimiter">;</span>  column &lt; screen_width<span class="Delimiter">;</span>  ++column<span class="Delimiter">,</span> addr+= <span class="Comment">/*</span><span class="Comment">size of screen-cell</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Normal">const</span> <span class="Normal">int</span> cell_color_offset = <span class="Constant">1</span><span class="Delimiter">;</span>
      <span class="Normal">uint32_t</span> curr = cursor<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> == <span class="Constant">0</span> &amp;&amp; isspace<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>curr == <span class="Constant">' '</span> &amp;&amp; color != -<span class="Constant">1</span> &amp;&amp; color != get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
        <span class="Comment">// filter out other colors</span>
        <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> != <span class="Constant">0</span> &amp;&amp; get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> == curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        <span class="Normal">if</span> <span class="Delimiter">(</span>color == -<span class="Constant">1</span> || color == get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
        <span class="Comment">// contents match but color is off</span>
        <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
          <span class="Comment">// genuine test in a .mu file</span>
          raise &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;, address &quot;</span> &lt;&lt; addr &lt;&lt; <span class="Constant">&quot;, value &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;) to be in color &quot;</span> &lt;&lt; color &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
          dump_screen<span class="Delimiter">();</span>
        <span class="Delimiter">}</span>
        <span class="Normal">else</span> <span class="Delimiter">{</span>
          <span class="Comment">// just testing check_screen</span>
          raise &lt;&lt; <span class="Constant">&quot;expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to be in color &quot;</span> &lt;&lt; color &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
        <span class="Delimiter">}</span>
        <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
        <span class="Identifier">return</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>

      <span class="Comment">// really a mismatch</span>
      <span class="Comment">// can't print multi-byte unicode characters in errors just yet. not very useful for debugging anyway.</span>
      <span class="Normal">char</span> expected_pretty[<span class="Constant">10</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>curr &lt; <span class="Constant">256</span> &amp;&amp; !iscntrl<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
        <span class="Comment">// &quot; ('&lt;curr&gt;')&quot;</span>
        expected_pretty[<span class="Constant">0</span>] = <span class="Constant">' '</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">1</span>] = <span class="Constant">'('</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">2</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">3</span>] = <span class="Normal">static_cast</span>&lt;<span class="Normal">unsigned</span> <span class="Normal">char</span>&gt;<span class="Delimiter">(</span>curr<span class="Delimiter">),</span> expected_pretty[<span class="Constant">4</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">5</span>] = <span class="Constant">')'</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">6</span>] = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
      <span class="Normal">char</span> actual_pretty[<span class="Constant">10</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> &lt; <span class="Constant">256</span> &amp;&amp; !iscntrl<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
        <span class="Comment">// &quot; ('&lt;curr&gt;')&quot;</span>
        actual_pretty[<span class="Constant">0</span>] = <span class="Constant">' '</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">1</span>] = <span class="Constant">'('</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">2</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">3</span>] = <span class="Normal">static_cast</span>&lt;<span class="Normal">unsigned</span> <span class="Normal">char</span>&gt;<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)),</span> actual_pretty[<span class="Constant">4</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">5</span>] = <span class="Constant">')'</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">6</span>] = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>

      ostringstream color_phrase<span class="Delimiter">;</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>color != -<span class="Constant">1</span><span class="Delimiter">)</span> color_phrase &lt;&lt; <span class="Constant">&quot; in color &quot;</span> &lt;&lt; color<span class="Delimiter">;</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        <span class="Comment">// genuine test in a .mu file</span>
        raise &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to contain &quot;</span> &lt;&lt; curr &lt;&lt; expected_pretty &lt;&lt; color_phrase<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; actual_pretty &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
        dump_screen<span class="Delimiter">();</span>
      <span class="Delimiter">}</span>
      <span class="Normal">else</span> <span class="Delimiter">{</span>
        <span class="Comment">// just testing check_screen</span>
        raise &lt;&lt; <span class="Constant">&quot;expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to contain &quot;</span> &lt;&lt; curr &lt;&lt; expected_pretty &lt;&lt; color_phrase<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; actual_pretty &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Delimiter">}</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
      <span class="Identifier">return</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'.'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      raise &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: row &quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot; of the expected screen is too long</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
      <span class="Identifier">return</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  cursor<span class="Delimiter">.</span>skip_whitespace_and_comments<span class="Delimiter">();</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!cursor<span class="Delimiter">.</span>at_end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    raise &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen has too many rows</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

raw_string_stream::raw_string_stream<span class="Delimiter">(</span><span class="Normal">const</span> string&amp; backing<span class="Delimiter">)</span> :index<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> max<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>backing<span class="Delimiter">)),</span> buf<span class="Delimiter">(</span>backing<span class="Delimiter">.</span>c_str<span class="Delimiter">())</span> <span class="Delimiter">{}</span>

<span class="Normal">bool</span> raw_string_stream::at_end<span class="Delimiter">()</span> <span class="Normal">const</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>index &gt;= max<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>tb_utf8_char_length<span class="Delimiter">(</span>buf[index]<span class="Delimiter">)</span> &gt; max-index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;unicode string seems corrupted at index &quot;</span>&lt;&lt; index &lt;&lt; <span class="Constant">&quot; character &quot;</span> &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span>buf[index]<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">uint32_t</span> raw_string_stream::get<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>index &lt; max<span class="Delimiter">);</span>  <span class="Comment">// caller must check bounds before calling 'get'</span>
  <span class="Normal">uint32_t</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> length = tb_utf8_char_to_unicode<span class="Delimiter">(</span>&amp;result<span class="Delimiter">,</span> &amp;buf[index]<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>length != TB_EOF<span class="Delimiter">);</span>
  index += length<span class="Delimiter">;</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">uint32_t</span> raw_string_stream::peek<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>index &lt; max<span class="Delimiter">);</span>  <span class="Comment">// caller must check bounds before calling 'get'</span>
  <span class="Normal">uint32_t</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> length = tb_utf8_char_to_unicode<span class="Delimiter">(</span>&amp;result<span class="Delimiter">,</span> &amp;buf[index]<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>length != TB_EOF<span class="Delimiter">);</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">void</span> raw_string_stream::skip_whitespace_and_comments<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Normal">while</span> <span class="Delimiter">(</span>!at_end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>peek<span class="Delimiter">()))</span> get<span class="Delimiter">();</span>
    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Comment">// skip comment</span>
      get<span class="Delimiter">();</span>
      <span class="Normal">while</span> <span class="Delimiter">(</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> get<span class="Delimiter">();</span>  <span class="Comment">// implicitly also handles CRLF</span>
    <span class="Delimiter">}</span>
    <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
_DUMP_SCREEN<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;$dump-screen&quot;</span><span class="Delimiter">,</span> _DUMP_SCREEN<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> _DUMP_SCREEN: <span class="Delimiter">{</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> _DUMP_SCREEN: <span class="Delimiter">{</span>
  dump_screen<span class="Delimiter">();</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> dump_screen<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Normal">int</span> screen_location = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> SCREEN<span class="Delimiter">)</span> + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> width_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;num-columns&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_width = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_location+width_offset<span class="Delimiter">);</span>
  <span class="Normal">int</span> height_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;num-rows&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_height = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_location+height_offset<span class="Delimiter">);</span>
  <span class="Normal">int</span> data_offset = find_element_name<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;screen&quot;</span><span class="Delimiter">),</span> <span class="Constant">&quot;data&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>data_offset &gt;= <span class="Constant">0</span><span class="Delimiter">);</span>
  <span class="Normal">int</span> screen_data_location = screen_location+data_offset<span class="Delimiter">;</span>  <span class="Comment">// type: address:array:character</span>
  <span class="Normal">int</span> screen_data_start = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_data_location<span class="Delimiter">)</span> + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// type: array:character</span>
  assert<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_data_start<span class="Delimiter">)</span> == screen_width*screen_height<span class="Delimiter">);</span>
  <span class="Normal">int</span> curr = screen_data_start+<span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// skip length</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> row = <span class="Constant">0</span><span class="Delimiter">;</span>  row &lt; screen_height<span class="Delimiter">;</span>  ++row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    cerr &lt;&lt; <span class="Constant">'.'</span><span class="Delimiter">;</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> col = <span class="Constant">0</span><span class="Delimiter">;</span>  col &lt; screen_width<span class="Delimiter">;</span>  ++col<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">))</span>
        cerr &lt;&lt; to_unicode<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)));</span>
      <span class="Normal">else</span>
        cerr &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
      curr += <span class="Comment">/*</span><span class="Comment">size of screen-cell</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    cerr &lt;&lt; <span class="Constant">&quot;.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>
</pre>
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