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<title>Mu - 403code-point.mu</title>
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<a href='https://github.com/akkartik/mu/blob/master/403code-point.mu'>https://github.com/akkartik/mu/blob/master/403code-point.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="Comment"># Helpers for Unicode &quot;code points&quot;.</span>
<span id="L2" class="LineNr">  2 </span><span class="Comment"># <a href="https://en.wikipedia.org/wiki/Code_point">https://en.wikipedia.org/wiki/Code_point</a></span>
<span id="L3" class="LineNr">  3 </span><span class="Comment">#</span>
<span id="L4" class="LineNr">  4 </span><span class="Comment"># Mu has no characters, only code points and graphemes.</span>
<span id="L5" class="LineNr">  5 </span><span class="Comment"># Code points are the indivisible atoms of text streams.</span>
<span id="L6" class="LineNr">  6 </span><span class="Comment"># Graphemes are the smallest self-contained unit of text.</span>
<span id="L7" class="LineNr">  7 </span><span class="Comment"># Graphemes may consist of multiple code points.</span>
<span id="L8" class="LineNr">  8 </span><span class="Comment">#</span>
<span id="L9" class="LineNr">  9 </span><span class="Comment"># Mu graphemes are always represented in utf-8, and they are required to fit</span>
<span id="L10" class="LineNr"> 10 </span><span class="Comment"># in 4 bytes.</span>
<span id="L11" class="LineNr"> 11 </span><span class="Comment">#</span>
<span id="L12" class="LineNr"> 12 </span><span class="Comment"># Mu doesn't currently support combining code points, or graphemes made of</span>
<span id="L13" class="LineNr"> 13 </span><span class="Comment"># multiple code points. One day we will.</span>
<span id="L14" class="LineNr"> 14 </span>
<span id="L15" class="LineNr"> 15 </span><span class="Comment"># transliterated from tb_utf8_unicode_to_char in <a href="https://github.com/nsf/termbox">https://github.com/nsf/termbox</a></span>
<span id="L16" class="LineNr"> 16 </span><span class="Comment"># <a href="https://wiki.tcl-lang.org/page/UTF%2D8+bit+by+bit">https://wiki.tcl-lang.org/page/UTF%2D8+bit+by+bit</a> explains the algorithm</span>
<span id="L17" class="LineNr"> 17 </span><span class="Comment">#</span>
<span id="L18" class="LineNr"> 18 </span><span class="Comment"># The day we want to support combining characters, this function will need to</span>
<span id="L19" class="LineNr"> 19 </span><span class="Comment"># take multiple code points. Or something.</span>
<span id="L20" class="LineNr"> 20 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403code-point.mu.html#L20'>to-grapheme</a></span> in: code-point<span class="PreProc"> -&gt; </span>out/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
<span id="L21" class="LineNr"> 21 </span>$to-grapheme:body: <span class="Delimiter">{</span>
<span id="L22" class="LineNr"> 22 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy in
<span id="L23" class="LineNr"> 23 </span>  <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L24" class="LineNr"> 24 </span>  <span class="PreProc">var</span> first/<span class="Constant">edx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L25" class="LineNr"> 25 </span>  $to-grapheme:compute-length: <span class="Delimiter">{</span>
<span id="L26" class="LineNr"> 26 </span>    <span class="Comment"># single byte: just return it</span>
<span id="L27" class="LineNr"> 27 </span>    compare c, <span class="Constant">0x7f</span>
<span id="L28" class="LineNr"> 28 </span>    <span class="Delimiter">{</span>
<span id="L29" class="LineNr"> 29 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L30" class="LineNr"> 30 </span>      out <span class="SpecialChar">&lt;-</span> copy c
<span id="L31" class="LineNr"> 31 </span>      <span class="PreProc">break</span> $to-grapheme:body
<span id="L32" class="LineNr"> 32 </span>    <span class="Delimiter">}</span>
<span id="L33" class="LineNr"> 33 </span>    <span class="Comment"># 2 bytes</span>
<span id="L34" class="LineNr"> 34 </span>    compare c, <span class="Constant">0x7ff</span>
<span id="L35" class="LineNr"> 35 </span>    <span class="Delimiter">{</span>
<span id="L36" class="LineNr"> 36 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L37" class="LineNr"> 37 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L38" class="LineNr"> 38 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xc0</span>
<span id="L39" class="LineNr"> 39 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L40" class="LineNr"> 40 </span>    <span class="Delimiter">}</span>
<span id="L41" class="LineNr"> 41 </span>    <span class="Comment"># 3 bytes</span>
<span id="L42" class="LineNr"> 42 </span>    compare c, <span class="Constant">0xffff</span>
<span id="L43" class="LineNr"> 43 </span>    <span class="Delimiter">{</span>
<span id="L44" class="LineNr"> 44 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L45" class="LineNr"> 45 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">2</span>
<span id="L46" class="LineNr"> 46 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xe0</span>
<span id="L47" class="LineNr"> 47 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L48" class="LineNr"> 48 </span>    <span class="Delimiter">}</span>
<span id="L49" class="LineNr"> 49 </span>    <span class="Comment"># 4 bytes</span>
<span id="L50" class="LineNr"> 50 </span>    compare c, <span class="Constant">0x1fffff</span>
<span id="L51" class="LineNr"> 51 </span>    <span class="Delimiter">{</span>
<span id="L52" class="LineNr"> 52 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L53" class="LineNr"> 53 </span>      num-trailers <span class="SpecialChar">&lt;-</span> copy <span class="Constant">3</span>
<span id="L54" class="LineNr"> 54 </span>      first <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xf0</span>
<span id="L55" class="LineNr"> 55 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L56" class="LineNr"> 56 </span>    <span class="Delimiter">}</span>
<span id="L57" class="LineNr"> 57 </span>    <span class="Comment"># more than 4 bytes: unsupported</span>
<span id="L58" class="LineNr"> 58 </span>    compare c, <span class="Constant">0x1fffff</span>
<span id="L59" class="LineNr"> 59 </span>    <span class="Delimiter">{</span>
<span id="L60" class="LineNr"> 60 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L61" class="LineNr"> 61 </span>      <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">&quot;unsupported code point &quot;</span>
<span id="L62" class="LineNr"> 62 </span>      <a href='304screen.subx.html#L200'>print-int32-hex-to-real-screen</a> c
<span id="L63" class="LineNr"> 63 </span>      <a href='304screen.subx.html#L122'>print-string-to-real-screen</a> <span class="Constant">&quot;\n&quot;</span>
<span id="L64" class="LineNr"> 64 </span>      <span class="PreProc">var</span> exit-status/<span class="Constant">ebx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">1</span>
<span id="L65" class="LineNr"> 65 </span>      syscall_exit
<span id="L66" class="LineNr"> 66 </span>    <span class="Delimiter">}</span>
<span id="L67" class="LineNr"> 67 </span>  <span class="Delimiter">}</span>
<span id="L68" class="LineNr"> 68 </span>  <span class="Comment"># emit trailer bytes, 6 bits from 'in', first two bits '10'</span>
<span id="L69" class="LineNr"> 69 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L70" class="LineNr"> 70 </span>  <span class="Delimiter">{</span>
<span id="L71" class="LineNr"> 71 </span>    compare num-trailers, <span class="Constant">0</span>
<span id="L72" class="LineNr"> 72 </span>    <span class="PreProc">break-if-&lt;=</span>
<span id="L73" class="LineNr"> 73 </span>    <span class="PreProc">var</span> tmp/<span class="Constant">esi</span>: int <span class="SpecialChar">&lt;-</span> copy c
<span id="L74" class="LineNr"> 74 </span>    tmp <span class="SpecialChar">&lt;-</span> and <span class="Constant">0x3f</span>
<span id="L75" class="LineNr"> 75 </span>    tmp <span class="SpecialChar">&lt;-</span> or <span class="Constant">0x80</span>
<span id="L76" class="LineNr"> 76 </span>    result <span class="SpecialChar">&lt;-</span> shift-left <span class="Constant">8</span>
<span id="L77" class="LineNr"> 77 </span>    result <span class="SpecialChar">&lt;-</span> or tmp
<span id="L78" class="LineNr"> 78 </span>    <span class="Comment"># update loop state</span>
<span id="L79" class="LineNr"> 79 </span>    c <span class="SpecialChar">&lt;-</span> shift-right <span class="Constant">6</span>
<span id="L80" class="LineNr"> 80 </span>    num-trailers <span class="SpecialChar">&lt;-</span> decrement
<span id="L81" class="LineNr"> 81 </span>    <span class="PreProc">loop</span>
<span id="L82" class="LineNr"> 82 </span>  <span class="Delimiter">}</span>
<span id="L83" class="LineNr"> 83 </span>  <span class="Comment"># emit engine</span>
<span id="L84" class="LineNr"> 84 </span>  result <span class="SpecialChar">&lt;-</span> shift-left <span class="Constant">8</span>
<span id="L85" class="LineNr"> 85 </span>  result <span class="SpecialChar">&lt;-</span> or c
<span id="L86" class="LineNr"> 86 </span>  result <span class="SpecialChar">&lt;-</span> or first
<span id="L87" class="LineNr"> 87 </span>  <span class="Comment">#</span>
<span id="L88" class="LineNr"> 88 </span>  out <span class="SpecialChar">&lt;-</span> copy result
<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">}</span>
<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">}</span>
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="Comment"># single-byte code point have identical graphemes</span>
<span id="L93" class="LineNr"> 93 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L93'>test-to-grapheme-single-byte</a></span> <span class="Delimiter">{</span>
<span id="L94" class="LineNr"> 94 </span>  <span class="PreProc">var</span> in-int/<span class="Constant">ecx</span>: int <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0</span>
<span id="L95" class="LineNr"> 95 </span>  <span class="Delimiter">{</span>
<span id="L96" class="LineNr"> 96 </span>    compare in-int, <span class="Constant">0x7f</span>
<span id="L97" class="LineNr"> 97 </span>    <span class="PreProc">break-if-&gt;</span>
<span id="L98" class="LineNr"> 98 </span>    <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy in-int
<span id="L99" class="LineNr"> 99 </span>    <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in
<span id="L100" class="LineNr">100 </span>    <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L101" class="LineNr">101 </span>    <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, in-int, <span class="Constant">&quot;F - test-to-grapheme-single-byte&quot;</span>
<span id="L102" class="LineNr">102 </span>    in-int <span class="SpecialChar">&lt;-</span> increment
<span id="L103" class="LineNr">103 </span>    <span class="PreProc">loop</span>
<span id="L104" class="LineNr">104 </span>  <span class="Delimiter">}</span>
<span id="L105" class="LineNr">105 </span><span class="Delimiter">}</span>
<span id="L106" class="LineNr">106 </span>
<span id="L107" class="LineNr">107 </span>                                                              <span class="Comment"># byte       | byte      | byte      | byte</span>
<span id="L108" class="LineNr">108 </span><span class="Comment"># smallest 2-byte utf-8</span>
<span id="L109" class="LineNr">109 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L109'>test-to-grapheme-two-bytes-min</a></span> <span class="Delimiter">{</span>
<span id="L110" class="LineNr">110 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x80</span>                         <span class="Comment">#                                 10     00-0000</span>
<span id="L111" class="LineNr">111 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in
<span id="L112" class="LineNr">112 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L113" class="LineNr">113 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x80c2</span>, <span class="Constant">&quot;F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/2a&quot;</span>      <span class="Comment">#                         110 0-0010  10 00-0000</span>
<span id="L114" class="LineNr">114 </span><span class="Delimiter">}</span>
<span id="L115" class="LineNr">115 </span>
<span id="L116" class="LineNr">116 </span><span class="Comment"># largest 2-byte utf-8</span>
<span id="L117" class="LineNr">117 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L117'>test-to-grapheme-two-bytes-max</a></span> <span class="Delimiter">{</span>
<span id="L118" class="LineNr">118 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x7ff</span>                        <span class="Comment">#                             1-1111     11-1111</span>
<span id="L119" class="LineNr">119 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in
<span id="L120" class="LineNr">120 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L121" class="LineNr">121 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfdf</span>, <span class="Constant">&quot;F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/2b&quot;</span>      <span class="Comment">#                         110 1-1111  10 11-1111</span>
<span id="L122" class="LineNr">122 </span><span class="Delimiter">}</span>
<span id="L123" class="LineNr">123 </span>
<span id="L124" class="LineNr">124 </span><span class="Comment"># smallest 3-byte utf-8</span>
<span id="L125" class="LineNr">125 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L125'>test-to-grapheme-three-bytes-min</a></span> <span class="Delimiter">{</span>
<span id="L126" class="LineNr">126 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x800</span>                        <span class="Comment">#                            10-0000     00-0000</span>
<span id="L127" class="LineNr">127 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in
<span id="L128" class="LineNr">128 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L129" class="LineNr">129 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x80a0e0</span>, <span class="Constant">&quot;F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/3a&quot;</span>    <span class="Comment">#              1110 0000  10 10-0000  10 00-0000</span>
<span id="L130" class="LineNr">130 </span><span class="Delimiter">}</span>
<span id="L131" class="LineNr">131 </span>
<span id="L132" class="LineNr">132 </span><span class="Comment"># largest 3-byte utf-8</span>
<span id="L133" class="LineNr">133 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L133'>test-to-grapheme-three-bytes-max</a></span> <span class="Delimiter">{</span>
<span id="L134" class="LineNr">134 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0xffff</span>                       <span class="Comment">#                   1111     11-1111     11-1111</span>
<span id="L135" class="LineNr">135 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in
<span id="L136" class="LineNr">136 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L137" class="LineNr">137 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfbfef</span>, <span class="Constant">&quot;F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/3b&quot;</span>    <span class="Comment">#              1110 1111  10 11-1111  10 11-1111</span>
<span id="L138" class="LineNr">138 </span><span class="Delimiter">}</span>
<span id="L139" class="LineNr">139 </span>
<span id="L140" class="LineNr">140 </span><span class="Comment"># smallest 4-byte utf-8</span>
<span id="L141" class="LineNr">141 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L141'>test-to-grapheme-four-bytes-min</a></span> <span class="Delimiter">{</span>
<span id="L142" class="LineNr">142 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x10000</span>                      <span class="Comment">#                 1-0000     00-0000     00-0000</span>
<span id="L143" class="LineNr">143 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in
<span id="L144" class="LineNr">144 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L145" class="LineNr">145 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0x808090f0</span>, <span class="Constant">&quot;F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/4a&quot;</span>  <span class="Comment"># 1111-0 000  10 01-0000  10 00-0000  10 00-0000</span>
<span id="L146" class="LineNr">146 </span><span class="Delimiter">}</span>
<span id="L147" class="LineNr">147 </span>
<span id="L148" class="LineNr">148 </span><span class="Comment"># largest 4-byte utf-8</span>
<span id="L149" class="LineNr">149 </span><span class="PreProc">fn</span> <span class="muTest"><a href='403code-point.mu.html#L149'>test-to-grapheme-four-bytes-max</a></span> <span class="Delimiter">{</span>
<span id="L150" class="LineNr">150 </span>  <span class="PreProc">var</span> in/<span class="Constant">eax</span>: code-point <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x1fffff</span>                     <span class="Comment">#        111     11-1111     11-1111     11-1111</span>
<span id="L151" class="LineNr">151 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> <a href='403code-point.mu.html#L20'>to-grapheme</a> in
<span id="L152" class="LineNr">152 </span>  <span class="PreProc">var</span> out-int/<span class="Constant">eax</span>: int <span class="SpecialChar">&lt;-</span> copy out
<span id="L153" class="LineNr">153 </span>  <a href='102test.subx.html#L23'>check-ints-equal</a> out-int, <span class="Constant">0xbfbfbff7</span>, <span class="Constant">&quot;F - <a href='403code-point.mu.html#L20'>to-grapheme</a>/4b&quot;</span>  <span class="Comment"># 1111-0 111  10 11-1111  10 11-1111  10 11-1111</span>
<span id="L154" class="LineNr">154 </span><span class="Delimiter">}</span>
<span id="L155" class="LineNr">155 </span>
<span id="L156" class="LineNr">156 </span><span class="Comment"># To run all tests, uncomment this and run:</span>
<span id="L157" class="LineNr">157 </span><span class="Comment">#   $ ./translate_mu ''  &amp;&amp;  ./a.elf</span>
<span id="L158" class="LineNr">158 </span><span class="CommentedCode">#? fn main -&gt; r/ebx: int {</span>
<span id="L159" class="LineNr">159 </span><span class="CommentedCode">#?   run-tests</span>
<span id="L160" class="LineNr">160 </span><span class="CommentedCode">#?   r &lt;- copy 0</span>
<span id="L161" class="LineNr">161 </span><span class="CommentedCode">#? }</span>
</pre>
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