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<title>Mu - 515parse-float.mu</title>
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<a href='https://github.com/akkartik/mu/blob/main/515parse-float.mu'>https://github.com/akkartik/mu/blob/main/515parse-float.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># no support for scientific notation yet</span>
<span id="L2" class="LineNr"> 2 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='515parse-float.mu.html#L2'>parse-float-decimal</a></span> in: (addr stream byte)<span class="PreProc"> -> </span>_/<span class="Constant">xmm1</span>: float <span class="Delimiter">{</span>
<span id="L3" class="LineNr"> 3 </span> <span class="PreProc">var</span> zero: float
<span id="L4" class="LineNr"> 4 </span> <span class="PreProc">var</span> result/<span class="Constant">xmm1</span>: float <span class="Special"><-</span> copy zero
<span id="L5" class="LineNr"> 5 </span> <span class="PreProc">var</span> first-iter?/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> copy <span class="Constant">1</span>/true
<span id="L6" class="LineNr"> 6 </span> <a href='106stream.subx.html#L59'>rewind-stream</a> in
<span id="L7" class="LineNr"> 7 </span> <span class="PreProc">var</span> negative?/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>/false
<span id="L8" class="LineNr"> 8 </span> <span class="muComment"># first loop: integer part</span>
<span id="L9" class="LineNr"> 9 </span> <span class="PreProc">var</span> ten/eax: int <span class="Special"><-</span> copy <span class="Constant">0xa</span>
<span id="L10" class="LineNr"> 10 </span> <span class="PreProc">var</span> ten-f/<span class="Constant">xmm2</span>: float <span class="Special"><-</span> convert ten
<span id="L11" class="LineNr"> 11 </span> <span class="Delimiter">{</span>
<span id="L12" class="LineNr"> 12 </span> <span class="PreProc">var</span> done?/eax: boolean <span class="Special"><-</span> <a href='309stream.subx.html#L6'>stream-empty?</a> in
<span id="L13" class="LineNr"> 13 </span> compare done?, <span class="Constant">0</span>/false
<span id="L14" class="LineNr"> 14 </span> <span class="PreProc">break-if-!=</span>
<span id="L15" class="LineNr"> 15 </span> <span class="PreProc">var</span> key/eax: byte <span class="Special"><-</span> <a href='112read-byte.subx.html#L13'>read-byte</a> in
<span id="L16" class="LineNr"> 16 </span> compare key, <span class="Constant">0x2e</span>/decimal-point
<span id="L17" class="LineNr"> 17 </span> <span class="PreProc">break-if-=</span>
<span id="L18" class="LineNr"> 18 </span> $parse-float-decimal:body: <span class="Delimiter">{</span>
<span id="L19" class="LineNr"> 19 </span> compare key, <span class="Constant">0x2d</span>/-
<span id="L20" class="LineNr"> 20 </span> <span class="Delimiter">{</span>
<span id="L21" class="LineNr"> 21 </span> <span class="PreProc">break-if-!=</span>
<span id="L22" class="LineNr"> 22 </span> compare first-iter?, <span class="Constant">0</span>/false
<span id="L23" class="LineNr"> 23 </span> <span class="Delimiter">{</span>
<span id="L24" class="LineNr"> 24 </span> <span class="PreProc">break-if-!=</span>
<span id="L25" class="LineNr"> 25 </span> <a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"parse-float-decimal: '-' only allowed in first position"</span>
<span id="L26" class="LineNr"> 26 </span> <span class="Delimiter">}</span>
<span id="L27" class="LineNr"> 27 </span> negative? <span class="Special"><-</span> copy <span class="Constant">1</span>/true
<span id="L28" class="LineNr"> 28 </span> <span class="PreProc">break</span> $parse-float-decimal:body
<span id="L29" class="LineNr"> 29 </span> <span class="Delimiter">}</span>
<span id="L30" class="LineNr"> 30 </span> compare key, <span class="Constant">0x30</span>/<span class="Constant">0</span>
<span id="L31" class="LineNr"> 31 </span> <span class="Delimiter">{</span>
<span id="L32" class="LineNr"> 32 </span> <span class="PreProc">break-if->=</span>
<span id="L33" class="LineNr"> 33 </span> <a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"parse-float-decimal: invalid character < '0'"</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Delimiter">}</span>
<span id="L35" class="LineNr"> 35 </span> compare key, <span class="Constant">0x39</span>/<span class="Constant">9</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Delimiter">{</span>
<span id="L37" class="LineNr"> 37 </span> <span class="PreProc">break-if-<=</span>
<span id="L38" class="LineNr"> 38 </span> <a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"parse-float-decimal: invalid character > '9'"</span>
<span id="L39" class="LineNr"> 39 </span> <span class="Delimiter">}</span>
<span id="L40" class="LineNr"> 40 </span> <span class="muComment"># key is now a digit</span>
<span id="L41" class="LineNr"> 41 </span> <span class="PreProc">var</span> digit-value/eax: int <span class="Special"><-</span> copy key
<span id="L42" class="LineNr"> 42 </span> digit-value <span class="Special"><-</span> subtract <span class="Constant">0x30</span>
<span id="L43" class="LineNr"> 43 </span> <span class="PreProc">var</span> digit-value-f/<span class="Constant">xmm3</span>: float <span class="Special"><-</span> convert digit-value
<span id="L44" class="LineNr"> 44 </span> result <span class="Special"><-</span> multiply ten-f
<span id="L45" class="LineNr"> 45 </span> result <span class="Special"><-</span> add digit-value-f
<span id="L46" class="LineNr"> 46 </span> <span class="Delimiter">}</span>
<span id="L47" class="LineNr"> 47 </span> first-iter? <span class="Special"><-</span> copy <span class="Constant">0</span>/false
<span id="L48" class="LineNr"> 48 </span> <span class="PreProc">loop</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Delimiter">}</span>
<span id="L50" class="LineNr"> 50 </span> <span class="muComment"># second loop: fraction</span>
<span id="L51" class="LineNr"> 51 </span> <span class="PreProc">var</span> current-position/<span class="Constant">xmm0</span>: float <span class="Special"><-</span> <a href='408float.mu.html#L18'>rational</a> <span class="Constant">1</span>, <span class="Constant">0xa</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Delimiter">{</span>
<span id="L53" class="LineNr"> 53 </span> <span class="PreProc">var</span> done?/eax: boolean <span class="Special"><-</span> <a href='309stream.subx.html#L6'>stream-empty?</a> in
<span id="L54" class="LineNr"> 54 </span> compare done?, <span class="Constant">0</span>/false
<span id="L55" class="LineNr"> 55 </span> <span class="PreProc">break-if-!=</span>
<span id="L56" class="LineNr"> 56 </span> <span class="PreProc">var</span> key/eax: byte <span class="Special"><-</span> <a href='112read-byte.subx.html#L13'>read-byte</a> in
<span id="L57" class="LineNr"> 57 </span> compare key, <span class="Constant">0x30</span>/<span class="Constant">0</span>
<span id="L58" class="LineNr"> 58 </span> <span class="Delimiter">{</span>
<span id="L59" class="LineNr"> 59 </span> <span class="PreProc">break-if->=</span>
<span id="L60" class="LineNr"> 60 </span> <a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"parse-float-decimal: invalid fraction character < '0'"</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Delimiter">}</span>
<span id="L62" class="LineNr"> 62 </span> compare key, <span class="Constant">0x39</span>/<span class="Constant">9</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Delimiter">{</span>
<span id="L64" class="LineNr"> 64 </span> <span class="PreProc">break-if-<=</span>
<span id="L65" class="LineNr"> 65 </span> <a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"parse-float-decimal: invalid fraction character > '9'"</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Delimiter">}</span>
<span id="L67" class="LineNr"> 67 </span> <span class="muComment"># key is now a digit</span>
<span id="L68" class="LineNr"> 68 </span> <span class="PreProc">var</span> digit-value/eax: int <span class="Special"><-</span> copy key
<span id="L69" class="LineNr"> 69 </span> digit-value <span class="Special"><-</span> subtract <span class="Constant">0x30</span>
<span id="L70" class="LineNr"> 70 </span> <span class="PreProc">var</span> digit-value-f/<span class="Constant">xmm3</span>: float <span class="Special"><-</span> convert digit-value
<span id="L71" class="LineNr"> 71 </span> digit-value-f <span class="Special"><-</span> multiply current-position
<span id="L72" class="LineNr"> 72 </span> result <span class="Special"><-</span> add digit-value-f
<span id="L73" class="LineNr"> 73 </span> current-position <span class="Special"><-</span> divide ten-f
<span id="L74" class="LineNr"> 74 </span> <span class="muComment">#</span>
<span id="L75" class="LineNr"> 75 </span> first-iter? <span class="Special"><-</span> copy <span class="Constant">0</span>/false
<span id="L76" class="LineNr"> 76 </span> <span class="PreProc">loop</span>
<span id="L77" class="LineNr"> 77 </span> <span class="Delimiter">}</span>
<span id="L78" class="LineNr"> 78 </span> <span class="muComment"># finally, the sign</span>
<span id="L79" class="LineNr"> 79 </span> compare negative?, <span class="Constant">0</span>/false
<span id="L80" class="LineNr"> 80 </span> <span class="Delimiter">{</span>
<span id="L81" class="LineNr"> 81 </span> <span class="PreProc">break-if-=</span>
<span id="L82" class="LineNr"> 82 </span> <span class="PreProc">var</span> minus-one/eax: int <span class="Special"><-</span> copy <span class="Constant">-1</span>
<span id="L83" class="LineNr"> 83 </span> <span class="PreProc">var</span> minus-one-f/<span class="Constant">xmm2</span>: float <span class="Special"><-</span> convert minus-one
<span id="L84" class="LineNr"> 84 </span> result <span class="Special"><-</span> multiply minus-one-f
<span id="L85" class="LineNr"> 85 </span> <span class="Delimiter">}</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="PreProc">fn</span> <span class="muTest"><a href='515parse-float.mu.html#L89'>test-parse-float-decimal-zero</a></span> <span class="Delimiter">{</span>
<span id="L90" class="LineNr"> 90 </span> <span class="PreProc">var</span> s-storage: (stream byte <span class="Constant">0x10</span>)
<span id="L91" class="LineNr"> 91 </span> <span class="PreProc">var</span> s/<span class="muRegEsi">esi</span>: (addr stream byte) <span class="Special"><-</span> address s-storage
<span id="L92" class="LineNr"> 92 </span> <a href='108write.subx.html#L11'>write</a> s, <span class="Constant">"00"</span>
<span id="L93" class="LineNr"> 93 </span> <span class="PreProc">var</span> x/<span class="Constant">xmm1</span>: float <span class="Special"><-</span> <a href='515parse-float.mu.html#L2'>parse-float-decimal</a> s
<span id="L94" class="LineNr"> 94 </span> <span class="PreProc">var</span> expected/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L95" class="LineNr"> 95 </span> <span class="PreProc">var</span> expected-f/<span class="Constant">xmm0</span>: float <span class="Special"><-</span> convert expected
<span id="L96" class="LineNr"> 96 </span> compare x, expected-f
<span id="L97" class="LineNr"> 97 </span> <span class="Delimiter">{</span>
<span id="L98" class="LineNr"> 98 </span> <span class="PreProc">break-if-=</span>
<span id="L99" class="LineNr"> 99 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"F - test-parse-float-decimal-zero"</span>, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L100" class="LineNr">100 </span> <a href='501draw-text.mu.html#L65'>move-cursor-to-left-margin-of-next-line</a> <span class="Constant">0</span>/screen
<span id="L101" class="LineNr">101 </span> <a href='104test.subx.html#L5'>count-test-failure</a>
<span id="L102" class="LineNr">102 </span> <span class="Delimiter">}</span>
<span id="L103" class="LineNr">103 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"."</span>, <span class="Constant">3</span>/fg=cyan, <span class="Constant">0</span>/bg
<span id="L104" class="LineNr">104 </span><span class="Delimiter">}</span>
<span id="L105" class="LineNr">105 </span>
<span id="L106" class="LineNr">106 </span><span class="PreProc">fn</span> <span class="muTest"><a href='515parse-float.mu.html#L106'>test-parse-float-decimal-integer</a></span> <span class="Delimiter">{</span>
<span id="L107" class="LineNr">107 </span> <span class="PreProc">var</span> s-storage: (stream byte <span class="Constant">0x10</span>)
<span id="L108" class="LineNr">108 </span> <span class="PreProc">var</span> s/<span class="muRegEsi">esi</span>: (addr stream byte) <span class="Special"><-</span> address s-storage
<span id="L109" class="LineNr">109 </span> <a href='108write.subx.html#L11'>write</a> s, <span class="Constant">"34"</span>
<span id="L110" class="LineNr">110 </span> <span class="PreProc">var</span> x/<span class="Constant">xmm1</span>: float <span class="Special"><-</span> <a href='515parse-float.mu.html#L2'>parse-float-decimal</a> s
<span id="L111" class="LineNr">111 </span> <span class="PreProc">var</span> expected/eax: int <span class="Special"><-</span> copy <span class="Constant">0x22</span>/<span class="Constant">34</span>
<span id="L112" class="LineNr">112 </span> <span class="PreProc">var</span> expected-f/<span class="Constant">xmm0</span>: float <span class="Special"><-</span> convert expected
<span id="L113" class="LineNr">113 </span> compare x, expected-f
<span id="L114" class="LineNr">114 </span> <span class="Delimiter">{</span>
<span id="L115" class="LineNr">115 </span> <span class="PreProc">break-if-=</span>
<span id="L116" class="LineNr">116 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"F - test-parse-float-decimal-integer"</span>, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L117" class="LineNr">117 </span> <a href='501draw-text.mu.html#L65'>move-cursor-to-left-margin-of-next-line</a> <span class="Constant">0</span>/screen
<span id="L118" class="LineNr">118 </span> <a href='104test.subx.html#L5'>count-test-failure</a>
<span id="L119" class="LineNr">119 </span> <span class="Delimiter">}</span>
<span id="L120" class="LineNr">120 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"."</span>, <span class="Constant">3</span>/fg=cyan, <span class="Constant">0</span>/bg
<span id="L121" class="LineNr">121 </span><span class="Delimiter">}</span>
<span id="L122" class="LineNr">122 </span>
<span id="L123" class="LineNr">123 </span><span class="PreProc">fn</span> <span class="muTest"><a href='515parse-float.mu.html#L123'>test-parse-float-decimal-negative-integer</a></span> <span class="Delimiter">{</span>
<span id="L124" class="LineNr">124 </span> <span class="PreProc">var</span> s-storage: (stream byte <span class="Constant">0x10</span>)
<span id="L125" class="LineNr">125 </span> <span class="PreProc">var</span> s/<span class="muRegEsi">esi</span>: (addr stream byte) <span class="Special"><-</span> address s-storage
<span id="L126" class="LineNr">126 </span> <a href='108write.subx.html#L11'>write</a> s, <span class="Constant">"-34"</span>
<span id="L127" class="LineNr">127 </span> <span class="PreProc">var</span> x/<span class="Constant">xmm1</span>: float <span class="Special"><-</span> <a href='515parse-float.mu.html#L2'>parse-float-decimal</a> s
<span id="L128" class="LineNr">128 </span> <span class="PreProc">var</span> expected/eax: int <span class="Special"><-</span> copy <span class="Constant">-0x22</span>/<span class="Constant">-34</span>
<span id="L129" class="LineNr">129 </span> <span class="PreProc">var</span> expected-f/<span class="Constant">xmm0</span>: float <span class="Special"><-</span> convert expected
<span id="L130" class="LineNr">130 </span> compare x, expected-f
<span id="L131" class="LineNr">131 </span> <span class="Delimiter">{</span>
<span id="L132" class="LineNr">132 </span> <span class="PreProc">break-if-=</span>
<span id="L133" class="LineNr">133 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"F - test-parse-float-decimal-negative-integer"</span>, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L134" class="LineNr">134 </span> <a href='501draw-text.mu.html#L65'>move-cursor-to-left-margin-of-next-line</a> <span class="Constant">0</span>/screen
<span id="L135" class="LineNr">135 </span> <a href='104test.subx.html#L5'>count-test-failure</a>
<span id="L136" class="LineNr">136 </span> <span class="Delimiter">}</span>
<span id="L137" class="LineNr">137 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"."</span>, <span class="Constant">3</span>/fg=cyan, <span class="Constant">0</span>/bg
<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="PreProc">fn</span> <span class="muTest"><a href='515parse-float.mu.html#L140'>test-parse-float-decimal-fraction</a></span> <span class="Delimiter">{</span>
<span id="L141" class="LineNr">141 </span> <span class="PreProc">var</span> s-storage: (stream byte <span class="Constant">0x10</span>)
<span id="L142" class="LineNr">142 </span> <span class="PreProc">var</span> s/<span class="muRegEsi">esi</span>: (addr stream byte) <span class="Special"><-</span> address s-storage
<span id="L143" class="LineNr">143 </span> <a href='108write.subx.html#L11'>write</a> s, <span class="Constant">"3.4"</span>
<span id="L144" class="LineNr">144 </span> <span class="PreProc">var</span> x/<span class="Constant">xmm1</span>: float <span class="Special"><-</span> <a href='515parse-float.mu.html#L2'>parse-float-decimal</a> s
<span id="L145" class="LineNr">145 </span> <span class="PreProc">var</span> expected-f/<span class="Constant">xmm0</span>: float <span class="Special"><-</span> <a href='408float.mu.html#L18'>rational</a> <span class="Constant">0x22</span>/<span class="Constant">34</span>, <span class="Constant">0xa</span>/<span class="Constant">10</span>
<span id="L146" class="LineNr">146 </span> compare x, expected-f
<span id="L147" class="LineNr">147 </span> <span class="Delimiter">{</span>
<span id="L148" class="LineNr">148 </span> <span class="PreProc">break-if-=</span>
<span id="L149" class="LineNr">149 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"F - test-parse-float-decimal-fraction"</span>, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L150" class="LineNr">150 </span> <a href='501draw-text.mu.html#L65'>move-cursor-to-left-margin-of-next-line</a> <span class="Constant">0</span>/screen
<span id="L151" class="LineNr">151 </span> <a href='104test.subx.html#L5'>count-test-failure</a>
<span id="L152" class="LineNr">152 </span> <span class="Delimiter">}</span>
<span id="L153" class="LineNr">153 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"."</span>, <span class="Constant">3</span>/fg=cyan, <span class="Constant">0</span>/bg
<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="PreProc">fn</span> <span class="muTest"><a href='515parse-float.mu.html#L156'>test-parse-float-decimal-negative-fraction</a></span> <span class="Delimiter">{</span>
<span id="L157" class="LineNr">157 </span> <span class="PreProc">var</span> s-storage: (stream byte <span class="Constant">0x10</span>)
<span id="L158" class="LineNr">158 </span> <span class="PreProc">var</span> s/<span class="muRegEsi">esi</span>: (addr stream byte) <span class="Special"><-</span> address s-storage
<span id="L159" class="LineNr">159 </span> <a href='108write.subx.html#L11'>write</a> s, <span class="Constant">"-3.4"</span>
<span id="L160" class="LineNr">160 </span> <span class="PreProc">var</span> x/<span class="Constant">xmm1</span>: float <span class="Special"><-</span> <a href='515parse-float.mu.html#L2'>parse-float-decimal</a> s
<span id="L161" class="LineNr">161 </span> <span class="PreProc">var</span> expected-f/<span class="Constant">xmm0</span>: float <span class="Special"><-</span> <a href='408float.mu.html#L18'>rational</a> <span class="Constant">-0x22</span>/<span class="Constant">-34</span>, <span class="Constant">0xa</span>/<span class="Constant">10</span>
<span id="L162" class="LineNr">162 </span> compare x, expected-f
<span id="L163" class="LineNr">163 </span> <span class="Delimiter">{</span>
<span id="L164" class="LineNr">164 </span> <span class="PreProc">break-if-=</span>
<span id="L165" class="LineNr">165 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"F - test-parse-float-decimal-negative-fraction"</span>, <span class="Constant">3</span>/fg <span class="Constant">0</span>/bg
<span id="L166" class="LineNr">166 </span> <a href='501draw-text.mu.html#L65'>move-cursor-to-left-margin-of-next-line</a> <span class="Constant">0</span>/screen
<span id="L167" class="LineNr">167 </span> <a href='104test.subx.html#L5'>count-test-failure</a>
<span id="L168" class="LineNr">168 </span> <span class="Delimiter">}</span>
<span id="L169" class="LineNr">169 </span> <a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> <span class="Constant">0</span>/screen, <span class="Constant">"."</span>, <span class="Constant">3</span>/fg=cyan, <span class="Constant">0</span>/bg
<span id="L170" class="LineNr">170 </span><span class="Delimiter">}</span>
</pre>
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