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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Mu - 403unicode.mu</title>
<meta name="Generator" content="Vim/8.1">
<meta name="plugin-version" content="vim8.1_v1">
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<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
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a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.PreProc { color: #c000c0; }
.Special { color: #ff6060; }
.LineNr { }
.Delimiter { color: #c000c0; }
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<a href='https://github.com/akkartik/mu/blob/main/403unicode.mu'>https://github.com/akkartik/mu/blob/main/403unicode.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="muComment"># Helpers for Unicode.</span>
<span id="L2" class="LineNr">  2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr">  3 </span><span class="muComment"># Mu has no characters, only code points and graphemes.</span>
<span id="L4" class="LineNr">  4 </span><span class="muComment"># Code points are the indivisible atoms of text streams.</span>
<span id="L5" class="LineNr">  5 </span><span class="muComment">#   <a href="https://en.wikipedia.org/wiki/Code_point">https://en.wikipedia.org/wiki/Code_point</a></span>
<span id="L6" class="LineNr">  6 </span><span class="muComment"># Graphemes are the smallest self-contained unit of text.</span>
<span id="L7" class="LineNr">  7 </span><span class="muComment"># Graphemes may consist of multiple code points.</span>
<span id="L8" class="LineNr">  8 </span><span class="muComment">#</span>
<span id="L9" class="LineNr">  9 </span><span class="muComment"># Mu graphemes are always represented in utf-8, and they are required to fit</span>
<span id="L10" class="LineNr"> 10 </span><span class="muComment"># in 4 bytes.</span>
<span id="L11" class="LineNr"> 11 </span><span class="muComment">#</span>
<span id="L12" class="LineNr"> 12 </span><span class="muComment"># Mu doesn't currently support combining code points, or graphemes made of</span>
<span id="L13" class="LineNr"> 13 </span><span class="muComment"># multiple code points. One day we will.</span>
<span id="L14" class="LineNr"> 14 </span><span class="muComment"># We also don't currently support code points that translate into multiple</span>
<span id="L15" class="LineNr"> 15 </span><span class="muComment"># or wide graphemes. (In particular, Tab will never be supported.)</span>
<span id="L16" class="LineNr"> 16 </span>
<span id="L17" class="LineNr"> 17 </span><span class="muComment"># transliterated from tb_utf8_unicode_to_char in <a href="https://github.com/nsf/termbox">https://github.com/nsf/termbox</a></span>
<span id="L18" class="LineNr"> 18 </span><span class="muComment"># <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="L19" class="LineNr"> 19 </span><span class="muComment">#</span>
<span id="L20" class="LineNr"> 20 </span><span class="muComment"># The day we want to support combining characters, this function will need to</span>
<span id="L21" class="LineNr"> 21 </span><span class="muComment"># take multiple code points. Or something.</span>
<span id="L22" class="LineNr"> 22 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L22'>to-grapheme</a></span> in: code-point<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
<span id="L23" class="LineNr"> 23 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: int <span class="Special">&lt;-</span> copy in
<span id="L24" class="LineNr"> 24 </span>  <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
<span id="L25" class="LineNr"> 25 </span>  <span class="PreProc">var</span> first/<span class="Constant">edx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
<span id="L26" class="LineNr"> 26 </span>  $to-grapheme:compute-length: <span class="Delimiter">{</span>
<span id="L27" class="LineNr"> 27 </span>    <span class="muComment"># single byte: just return it</span>
<span id="L28" class="LineNr"> 28 </span>    compare c, <span class="Constant">0x7f</span>
<span id="L29" class="LineNr"> 29 </span>    <span class="Delimiter">{</span>
<span id="L30" class="LineNr"> 30 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L31" class="LineNr"> 31 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="Special">&lt;-</span> copy c
<span id="L32" class="LineNr"> 32 </span>      <span class="PreProc">return</span> g
<span id="L33" class="LineNr"> 33 </span>    <span class="Delimiter">}</span>
<span id="L34" class="LineNr"> 34 </span>    <span class="muComment"># 2 bytes</span>
<span id="L35" class="LineNr"> 35 </span>    compare c, <span class="Constant">0x7ff</span>
<span id="L36" class="LineNr"> 36 </span>    <span class="Delimiter">{</span>
<span id="L37" class="LineNr"> 37 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L38" class="LineNr"> 38 </span>      num-trailers <span class="Special">&lt;-</span> copy <span class="Constant">1</span>
<span id="L39" class="LineNr"> 39 </span>      first <span class="Special">&lt;-</span> copy <span class="Constant">0xc0</span>
<span id="L40" class="LineNr"> 40 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L41" class="LineNr"> 41 </span>    <span class="Delimiter">}</span>
<span id="L42" class="LineNr"> 42 </span>    <span class="muComment"># 3 bytes</span>
<span id="L43" class="LineNr"> 43 </span>    compare c, <span class="Constant">0xffff</span>
<span id="L44" class="LineNr"> 44 </span>    <span class="Delimiter">{</span>
<span id="L45" class="LineNr"> 45 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L46" class="LineNr"> 46 </span>      num-trailers <span class="Special">&lt;-</span> copy <span class="Constant">2</span>
<span id="L47" class="LineNr"> 47 </span>      first <span class="Special">&lt;-</span> copy <span class="Constant">0xe0</span>
<span id="L48" class="LineNr"> 48 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L49" class="LineNr"> 49 </span>    <span class="Delimiter">}</span>
<span id="L50" class="LineNr"> 50 </span>    <span class="muComment"># 4 bytes</span>
<span id="L51" class="LineNr"> 51 </span>    compare c, <span class="Constant">0x1fffff</span>
<span id="L52" class="LineNr"> 52 </span>    <span class="Delimiter">{</span>
<span id="L53" class="LineNr"> 53 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L54" class="LineNr"> 54 </span>      num-trailers <span class="Special">&lt;-</span> copy <span class="Constant">3</span>
<span id="L55" class="LineNr"> 55 </span>      first <span class="Special">&lt;-</span> copy <span class="Constant">0xf0</span>
<span id="L56" class="LineNr"> 56 </span>      <span class="PreProc">break</span> $to-grapheme:compute-length
<span id="L57" class="LineNr"> 57 </span>    <span class="Delimiter">}</span>
<span id="L58" class="LineNr"> 58 </span>    <span class="muComment"># more than 4 bytes: unsupported</span>
<span id="L59" class="LineNr"> 59 </span>    <span class="muComment"># TODO: print error message to stderr</span>
<span id="L60" class="LineNr"> 60 </span>    compare c, <span class="Constant">0x1fffff</span>
<span id="L61" class="LineNr"> 61 </span>    <span class="Delimiter">{</span>
<span id="L62" class="LineNr"> 62 </span>      <span class="PreProc">break-if-&gt;</span>
<span id="L63" class="LineNr"> 63 </span>      <span class="PreProc">return</span> <span class="Constant">0</span>
<span id="L64" class="LineNr"> 64 </span>    <span class="Delimiter">}</span>
<span id="L65" class="LineNr"> 65 </span>  <span class="Delimiter">}</span>
<span id="L66" class="LineNr"> 66 </span>  <span class="muComment"># emit trailer bytes, 6 bits from 'in', first two bits '10'</span>
<span id="L67" class="LineNr"> 67 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: grapheme <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
<span id="L68" class="LineNr"> 68 </span>  <span class="Delimiter">{</span>
<span id="L69" class="LineNr"> 69 </span>    compare num-trailers, <span class="Constant">0</span>
<span id="L70" class="LineNr"> 70 </span>    <span class="PreProc">break-if-&lt;=</span>
<span id="L71" class="LineNr"> 71 </span>    <span class="PreProc">var</span> tmp/<span class="Constant">esi</span>: int <span class="Special">&lt;-</span> copy c
<span id="L72" class="LineNr"> 72 </span>    tmp <span class="Special">&lt;-</span> and <span class="Constant">0x3f</span>
<span id="L73" class="LineNr"> 73 </span>    tmp <span class="Special">&lt;-</span> or <span class="Constant">0x80</span>
<span id="L74" class="LineNr"> 74 </span>    result <span class="Special">&lt;-</span> shift-left <span class="Constant">8</span>
<span id="L75" class="LineNr"> 75 </span>    result <span class="Special">&lt;-</span> or tmp
<span id="L76" class="LineNr"> 76 </span>    <span class="muComment"># update loop state</span>
<span id="L77" class="LineNr"> 77 </span>    c <span class="Special">&lt;-</span> shift-right <span class="Constant">6</span>
<span id="L78" class="LineNr"> 78 </span>    num-trailers <span class="Special">&lt;-</span> decrement
<span id="L79" class="LineNr"> 79 </span>    <span class="PreProc">loop</span>
<span id="L80" class="LineNr"> 80 </span>  <span class="Delimiter">}</span>
<span id="L81" class="LineNr"> 81 </span>  <span class="muComment"># emit engine</span>
<span id="L82" class="LineNr"> 82 </span>  result <span class="Special">&lt;-</span> shift-left <span class="Constant">8</span>
<span id="L83" class="LineNr"> 83 </span>  result <span class="Special">&lt;-</span> or c
<span id="L84" class="LineNr"> 84 </span>  result <span class="Special">&lt;-</span> or first
<span id="L85" class="LineNr"> 85 </span>  <span class="muComment">#</span>
<span id="L86" class="LineNr"> 86 </span>  <span class="PreProc">return</span> result
<span id="L87" class="LineNr"> 87 </span><span class="Delimiter">}</span>
<span id="L88" class="LineNr"> 88 </span>
<span id="L89" class="LineNr"> 89 </span><span class="muComment"># TODO: bring in tests once we have check-ints-equal</span>
<span id="L90" class="LineNr"> 90 </span>
<span id="L91" class="LineNr"> 91 </span><span class="muComment"># read the next grapheme from a stream of bytes</span>
<span id="L92" class="LineNr"> 92 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L92'>read-grapheme</a></span> in: (addr stream byte)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: grapheme <span class="Delimiter">{</span>
<span id="L93" class="LineNr"> 93 </span>  <span class="muComment"># if at eof, return EOF</span>
<span id="L94" class="LineNr"> 94 </span>  <span class="Delimiter">{</span>
<span id="L95" class="LineNr"> 95 </span>    <span class="PreProc">var</span> eof?/<span class="Constant">eax</span>: boolean <span class="Special">&lt;-</span> <a href='309stream.subx.html#L6'>stream-empty?</a> in
<span id="L96" class="LineNr"> 96 </span>    compare eof?, <span class="Constant">0</span>/false
<span id="L97" class="LineNr"> 97 </span>    <span class="PreProc">break-if-=</span>
<span id="L98" class="LineNr"> 98 </span>    <span class="PreProc">return</span> <span class="Constant">0xffffffff</span>
<span id="L99" class="LineNr"> 99 </span>  <span class="Delimiter">}</span>
<span id="L100" class="LineNr">100 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: byte <span class="Special">&lt;-</span> <a href='112read-byte.subx.html#L13'>read-byte</a> in
<span id="L101" class="LineNr">101 </span>  <span class="PreProc">var</span> num-trailers/<span class="Constant">ecx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
<span id="L102" class="LineNr">102 </span>  $read-grapheme:compute-length: <span class="Delimiter">{</span>
<span id="L103" class="LineNr">103 </span>    <span class="muComment"># single byte: just return it</span>
<span id="L104" class="LineNr">104 </span>    compare c, <span class="Constant">0xc0</span>
<span id="L105" class="LineNr">105 </span>    <span class="Delimiter">{</span>
<span id="L106" class="LineNr">106 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L107" class="LineNr">107 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="Special">&lt;-</span> copy c
<span id="L108" class="LineNr">108 </span>      <span class="PreProc">return</span> g
<span id="L109" class="LineNr">109 </span>    <span class="Delimiter">}</span>
<span id="L110" class="LineNr">110 </span>    compare c, <span class="Constant">0xfe</span>
<span id="L111" class="LineNr">111 </span>    <span class="Delimiter">{</span>
<span id="L112" class="LineNr">112 </span>      <span class="PreProc">break-if-&lt;</span>
<span id="L113" class="LineNr">113 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="Special">&lt;-</span> copy c
<span id="L114" class="LineNr">114 </span>      <span class="PreProc">return</span> g
<span id="L115" class="LineNr">115 </span>    <span class="Delimiter">}</span>
<span id="L116" class="LineNr">116 </span>    <span class="muComment"># 2 bytes</span>
<span id="L117" class="LineNr">117 </span>    compare c, <span class="Constant">0xe0</span>
<span id="L118" class="LineNr">118 </span>    <span class="Delimiter">{</span>
<span id="L119" class="LineNr">119 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L120" class="LineNr">120 </span>      num-trailers <span class="Special">&lt;-</span> copy <span class="Constant">1</span>
<span id="L121" class="LineNr">121 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
<span id="L122" class="LineNr">122 </span>    <span class="Delimiter">}</span>
<span id="L123" class="LineNr">123 </span>    <span class="muComment"># 3 bytes</span>
<span id="L124" class="LineNr">124 </span>    compare c, <span class="Constant">0xf0</span>
<span id="L125" class="LineNr">125 </span>    <span class="Delimiter">{</span>
<span id="L126" class="LineNr">126 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L127" class="LineNr">127 </span>      num-trailers <span class="Special">&lt;-</span> copy <span class="Constant">2</span>
<span id="L128" class="LineNr">128 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
<span id="L129" class="LineNr">129 </span>    <span class="Delimiter">}</span>
<span id="L130" class="LineNr">130 </span>    <span class="muComment"># 4 bytes</span>
<span id="L131" class="LineNr">131 </span>    compare c, <span class="Constant">0xf8</span>
<span id="L132" class="LineNr">132 </span>    <span class="Delimiter">{</span>
<span id="L133" class="LineNr">133 </span>      <span class="PreProc">break-if-&gt;=</span>
<span id="L134" class="LineNr">134 </span>      num-trailers <span class="Special">&lt;-</span> copy <span class="Constant">3</span>
<span id="L135" class="LineNr">135 </span>      <span class="PreProc">break</span> $read-grapheme:compute-length
<span id="L136" class="LineNr">136 </span>    <span class="Delimiter">}</span>
<span id="L137" class="LineNr">137 </span>    <span class="muComment"># TODO: print error message</span>
<span id="L138" class="LineNr">138 </span>    <span class="PreProc">return</span> <span class="Constant">0</span>
<span id="L139" class="LineNr">139 </span>  <span class="Delimiter">}</span>
<span id="L140" class="LineNr">140 </span>  <span class="muComment"># prepend trailer bytes</span>
<span id="L141" class="LineNr">141 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: grapheme <span class="Special">&lt;-</span> copy c
<span id="L142" class="LineNr">142 </span>  <span class="PreProc">var</span> num-byte-shifts/<span class="Constant">edx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">1</span>
<span id="L143" class="LineNr">143 </span>  <span class="Delimiter">{</span>
<span id="L144" class="LineNr">144 </span>    compare num-trailers, <span class="Constant">0</span>
<span id="L145" class="LineNr">145 </span>    <span class="PreProc">break-if-&lt;=</span>
<span id="L146" class="LineNr">146 </span>    <span class="PreProc">var</span> tmp/<span class="Constant">eax</span>: byte <span class="Special">&lt;-</span> <a href='112read-byte.subx.html#L13'>read-byte</a> in
<span id="L147" class="LineNr">147 </span>    <span class="PreProc">var</span> tmp2/<span class="Constant">eax</span>: int <span class="Special">&lt;-</span> copy tmp
<span id="L148" class="LineNr">148 </span>    tmp2 <span class="Special">&lt;-</span> <a href='403unicode.mu.html#L159'>shift-left-bytes</a> tmp2, num-byte-shifts
<span id="L149" class="LineNr">149 </span>    result <span class="Special">&lt;-</span> or tmp2
<span id="L150" class="LineNr">150 </span>    <span class="muComment"># update loop state</span>
<span id="L151" class="LineNr">151 </span>    num-byte-shifts <span class="Special">&lt;-</span> increment
<span id="L152" class="LineNr">152 </span>    num-trailers <span class="Special">&lt;-</span> decrement
<span id="L153" class="LineNr">153 </span>    <span class="PreProc">loop</span>
<span id="L154" class="LineNr">154 </span>  <span class="Delimiter">}</span>
<span id="L155" class="LineNr">155 </span>  <span class="PreProc">return</span> result
<span id="L156" class="LineNr">156 </span><span class="Delimiter">}</span>
<span id="L157" class="LineNr">157 </span>
<span id="L158" class="LineNr">158 </span><span class="muComment"># needed because available primitives only shift by a literal/constant number of bits</span>
<span id="L159" class="LineNr">159 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L159'>shift-left-bytes</a></span> n: int, k: int<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
<span id="L160" class="LineNr">160 </span>  <span class="PreProc">var</span> i/<span class="Constant">ecx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
<span id="L161" class="LineNr">161 </span>  <span class="PreProc">var</span> result/<span class="Constant">eax</span>: int <span class="Special">&lt;-</span> copy n
<span id="L162" class="LineNr">162 </span>  <span class="Delimiter">{</span>
<span id="L163" class="LineNr">163 </span>    compare i, k
<span id="L164" class="LineNr">164 </span>    <span class="PreProc">break-if-&gt;=</span>
<span id="L165" class="LineNr">165 </span>    compare i, <span class="Constant">4</span>  <span class="muComment"># only 4 bytes in 32 bits</span>
<span id="L166" class="LineNr">166 </span>    <span class="PreProc">break-if-&gt;=</span>
<span id="L167" class="LineNr">167 </span>    result <span class="Special">&lt;-</span> shift-left <span class="Constant">8</span>
<span id="L168" class="LineNr">168 </span>    i <span class="Special">&lt;-</span> increment
<span id="L169" class="LineNr">169 </span>    <span class="PreProc">loop</span>
<span id="L170" class="LineNr">170 </span>  <span class="Delimiter">}</span>
<span id="L171" class="LineNr">171 </span>  <span class="PreProc">return</span> result
<span id="L172" class="LineNr">172 </span><span class="Delimiter">}</span>
<span id="L173" class="LineNr">173 </span>
<span id="L174" class="LineNr">174 </span><span class="muComment"># write a grapheme to a stream of bytes</span>
<span id="L175" class="LineNr">175 </span><span class="muComment"># this is like write-to-stream, except we skip leading 0 bytes</span>
<span id="L176" class="LineNr">176 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='403unicode.mu.html#L176'>write-grapheme</a></span> out: (addr stream byte), g: grapheme <span class="Delimiter">{</span>
<span id="L177" class="LineNr">177 </span>$write-grapheme:body: <span class="Delimiter">{</span>
<span id="L178" class="LineNr">178 </span>  <span class="PreProc">var</span> c/<span class="Constant">eax</span>: int <span class="Special">&lt;-</span> copy g
<span id="L179" class="LineNr">179 </span>  <a href='115write-byte.subx.html#L12'>append-byte</a> out, c  <span class="muComment"># first byte is always written</span>
<span id="L180" class="LineNr">180 </span>  c <span class="Special">&lt;-</span> shift-right <span class="Constant">8</span>
<span id="L181" class="LineNr">181 </span>  compare c, <span class="Constant">0</span>
<span id="L182" class="LineNr">182 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
<span id="L183" class="LineNr">183 </span>  <a href='115write-byte.subx.html#L12'>append-byte</a> out, c
<span id="L184" class="LineNr">184 </span>  c <span class="Special">&lt;-</span> shift-right <span class="Constant">8</span>
<span id="L185" class="LineNr">185 </span>  compare c, <span class="Constant">0</span>
<span id="L186" class="LineNr">186 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
<span id="L187" class="LineNr">187 </span>  <a href='115write-byte.subx.html#L12'>append-byte</a> out, c
<span id="L188" class="LineNr">188 </span>  c <span class="Special">&lt;-</span> shift-right <span class="Constant">8</span>
<span id="L189" class="LineNr">189 </span>  compare c, <span class="Constant">0</span>
<span id="L190" class="LineNr">190 </span>  <span class="PreProc">break-if-=</span> $write-grapheme:body
<span id="L191" class="LineNr">191 </span>  <a href='115write-byte.subx.html#L12'>append-byte</a> out, c
<span id="L192" class="LineNr">192 </span><span class="Delimiter">}</span>
<span id="L193" class="LineNr">193 </span><span class="Delimiter">}</span>
</pre>
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