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<a href='https://github.com/akkartik/mu/blob/main/apps/ex15.mu'>https://github.com/akkartik/mu/blob/main/apps/ex15.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Demo of combining-character support in Mu, which can be summarized as, "the</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment"># old typewriter-based approach of backing up one character and adding the</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># accent or _matra_ in."</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># <a href="https://en.wikipedia.org/wiki/Combining_character">https://en.wikipedia.org/wiki/Combining_character</a></span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment">#</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># Mu uses this approach for both accents in Latin languages and vowel</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># diacritics in Abugida scripts.</span>
<span id="L8" class="LineNr"> 8 </span><span class="muComment"># <a href="https://en.wikipedia.org/wiki/Diacritic">https://en.wikipedia.org/wiki/Diacritic</a></span>
<span id="L9" class="LineNr"> 9 </span><span class="muComment"># <a href="https://en.wikipedia.org/wiki/Abugida">https://en.wikipedia.org/wiki/Abugida</a></span>
<span id="L10" class="LineNr">10 </span><span class="muComment">#</span>
<span id="L11" class="LineNr">11 </span><span class="muComment"># Steps for trying it out:</span>
<span id="L12" class="LineNr">12 </span><span class="muComment"># 1. Translate this example into a disk image code.img.</span>
<span id="L13" class="LineNr">13 </span><span class="muComment"># ./translate apps/ex15.mu</span>
<span id="L14" class="LineNr">14 </span><span class="muComment"># 2. Run:</span>
<span id="L15" class="LineNr">15 </span><span class="muComment"># qemu-system-i386 -hda code.img -hdb data.img</span>
<span id="L16" class="LineNr">16 </span><span class="muComment">#</span>
<span id="L17" class="LineNr">17 </span><span class="muComment"># Expected output: 'à' in green in a few places near the top-left corner of</span>
<span id="L18" class="LineNr">18 </span><span class="muComment"># screen, showing off what this approach can and cannot do.</span>
<span id="L19" class="LineNr">19 </span>
<span id="L20" class="LineNr">20 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex15.mu.html#L20'>main</a></span> <a href='../500fake-screen.mu.html#L14'>screen</a>: (addr <a href='../500fake-screen.mu.html#L14'>screen</a>), keyboard: (addr keyboard), data-disk: (addr disk) <span class="Delimiter">{</span>
<span id="L21" class="LineNr">21 </span> <span class="muComment"># at the top of screen, the accent is almost cropped</span>
<span id="L22" class="LineNr">22 </span> <span class="PreProc">var</span> dummy/eax: int <span class="Special"><-</span> <a href='../103glyph.subx.html#L19'>draw-code-point-on-real-screen</a> <span class="Constant">0x61</span>/a, <span class="Constant">0</span>/x <span class="Constant">0</span>/y, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L23" class="LineNr">23 </span> <span class="PreProc">var</span> dummy/eax: int <span class="Special"><-</span> <a href='../103glyph.subx.html#L31'>overlay-code-point-on-real-screen</a> <span class="Constant">0x0300</span>/combining-grave-accent, <span class="Constant">0</span>/x <span class="Constant">0</span>/y, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L24" class="LineNr">24 </span>
<span id="L25" class="LineNr">25 </span> <span class="muComment"># below a grapheme with a descender, the accent uglily overlaps</span>
<span id="L26" class="LineNr">26 </span> <span class="muComment"># <a href="https://en.wikipedia.org/wiki/Descender">https://en.wikipedia.org/wiki/Descender</a></span>
<span id="L27" class="LineNr">27 </span> <span class="PreProc">var</span> dummy/eax: int <span class="Special"><-</span> <a href='../103glyph.subx.html#L19'>draw-code-point-on-real-screen</a> <span class="Constant">0x67</span>/g, <span class="Constant">4</span>/x <span class="Constant">3</span>/y, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L28" class="LineNr">28 </span> <span class="PreProc">var</span> dummy/eax: int <span class="Special"><-</span> <a href='../103glyph.subx.html#L19'>draw-code-point-on-real-screen</a> <span class="Constant">0x61</span>/a, <span class="Constant">4</span>/x <span class="Constant">4</span>/y, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L29" class="LineNr">29 </span> <span class="PreProc">var</span> dummy/eax: int <span class="Special"><-</span> <a href='../103glyph.subx.html#L31'>overlay-code-point-on-real-screen</a> <span class="Constant">0x0300</span>/combining-grave-accent, <span class="Constant">4</span>/x <span class="Constant">4</span>/y, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L30" class="LineNr">30 </span>
<span id="L31" class="LineNr">31 </span> <span class="muComment"># beside a grapheme with a descender, it becomes more obvious that monowidth fonts can't make baselines line up</span>
<span id="L32" class="LineNr">32 </span> <span class="muComment"># <a href="https://en.wikipedia.org/wiki/Baseline_(typography)">https://en.wikipedia.org/wiki/Baseline_(typography)</a></span>
<span id="L33" class="LineNr">33 </span> <span class="PreProc">var</span> dummy/eax: int <span class="Special"><-</span> <a href='../103glyph.subx.html#L19'>draw-code-point-on-real-screen</a> <span class="Constant">0x67</span>/g, <span class="Constant">8</span>/x <span class="Constant">3</span>/y, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L34" class="LineNr">34 </span> <span class="PreProc">var</span> dummy/eax: int <span class="Special"><-</span> <a href='../103glyph.subx.html#L19'>draw-code-point-on-real-screen</a> <span class="Constant">0x61</span>/a, <span class="Constant">9</span>/x <span class="Constant">3</span>/y, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L35" class="LineNr">35 </span> <span class="PreProc">var</span> dummy/eax: int <span class="Special"><-</span> <a href='../103glyph.subx.html#L31'>overlay-code-point-on-real-screen</a> <span class="Constant">0x0300</span>/combining-grave-accent, <span class="Constant">9</span>/x <span class="Constant">3</span>/y, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L36" class="LineNr">36 </span><span class="Delimiter">}</span>
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