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<a href='https://github.com/akkartik/mu/blob/master/411string.mu'>https://github.com/akkartik/mu/blob/master/411string.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># read up to 'len' graphemes after skipping the first 'start' ones</span>
<span id="L2" class="LineNr"> 2 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='411string.mu.html#L2'>substring</a></span> in: (addr array byte), start: int, len: int, out-ah: (addr handle array byte) <span class="Delimiter">{</span>
<span id="L3" class="LineNr"> 3 </span> <span class="PreProc">var</span> in-stream: (stream byte <span class="Constant">0x100</span>)
<span id="L4" class="LineNr"> 4 </span> <span class="PreProc">var</span> in-stream-addr/<span class="Constant">esi</span>: (addr stream byte) <span class="SpecialChar"><-</span> address in-stream
<span id="L5" class="LineNr"> 5 </span> <a href='108write.subx.html#L24'>write</a> in-stream-addr, in
<span id="L6" class="LineNr"> 6 </span> <span class="PreProc">var</span> out-stream: (stream byte <span class="Constant">0x100</span>)
<span id="L7" class="LineNr"> 7 </span> <span class="PreProc">var</span> out-stream-addr/<span class="Constant">edi</span>: (addr stream byte) <span class="SpecialChar"><-</span> address out-stream
<span id="L8" class="LineNr"> 8 </span> $substring:core: <span class="Delimiter">{</span>
<span id="L9" class="LineNr"> 9 </span> <span class="muComment"># skip 'start' graphemes</span>
<span id="L10" class="LineNr"> 10 </span> <span class="PreProc">var</span> i/<span class="Constant">eax</span>: int <span class="SpecialChar"><-</span> copy <span class="Constant">0</span>
<span id="L11" class="LineNr"> 11 </span> <span class="Delimiter">{</span>
<span id="L12" class="LineNr"> 12 </span> compare i, start
<span id="L13" class="LineNr"> 13 </span> <span class="PreProc">break-if->=</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Delimiter">{</span>
<span id="L15" class="LineNr"> 15 </span> <span class="PreProc">var</span> dummy/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> in-stream-addr
<span id="L16" class="LineNr"> 16 </span> compare dummy, <span class="Constant">0xffffffff</span> <span class="muComment"># end-of-file</span>
<span id="L17" class="LineNr"> 17 </span> <span class="PreProc">break-if-=</span> $substring:core
<span id="L18" class="LineNr"> 18 </span> <span class="Delimiter">}</span>
<span id="L19" class="LineNr"> 19 </span> i <span class="SpecialChar"><-</span> increment
<span id="L20" class="LineNr"> 20 </span> <span class="PreProc">loop</span>
<span id="L21" class="LineNr"> 21 </span> <span class="Delimiter">}</span>
<span id="L22" class="LineNr"> 22 </span> <span class="muComment"># copy 'len' graphemes</span>
<span id="L23" class="LineNr"> 23 </span> i <span class="SpecialChar"><-</span> copy <span class="Constant">0</span>
<span id="L24" class="LineNr"> 24 </span> <span class="Delimiter">{</span>
<span id="L25" class="LineNr"> 25 </span> compare i, len
<span id="L26" class="LineNr"> 26 </span> <span class="PreProc">break-if->=</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Delimiter">{</span>
<span id="L28" class="LineNr"> 28 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> in-stream-addr
<span id="L29" class="LineNr"> 29 </span> compare g, <span class="Constant">0xffffffff</span> <span class="muComment"># end-of-file</span>
<span id="L30" class="LineNr"> 30 </span> <span class="PreProc">break-if-=</span> $substring:core
<span id="L31" class="LineNr"> 31 </span> <a href='403unicode.mu.html#L379'>write-grapheme</a> out-stream-addr, g
<span id="L32" class="LineNr"> 32 </span> <span class="Delimiter">}</span>
<span id="L33" class="LineNr"> 33 </span> i <span class="SpecialChar"><-</span> increment
<span id="L34" class="LineNr"> 34 </span> <span class="PreProc">loop</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Delimiter">}</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Delimiter">}</span>
<span id="L37" class="LineNr"> 37 </span> <a href='310copy-bytes.subx.html#L59'>stream-to-array</a> out-stream-addr, out-ah
<span id="L38" class="LineNr"> 38 </span><span class="Delimiter">}</span>
<span id="L39" class="LineNr"> 39 </span>
<span id="L40" class="LineNr"> 40 </span><span class="PreProc">fn</span> <span class="muTest"><a href='411string.mu.html#L40'>test-substring</a></span> <span class="Delimiter">{</span>
<span id="L41" class="LineNr"> 41 </span> <span class="PreProc">var</span> out-h: (handle array byte)
<span id="L42" class="LineNr"> 42 </span> <span class="PreProc">var</span> out-ah/<span class="Constant">edi</span>: (addr handle array byte) <span class="SpecialChar"><-</span> address out-h
<span id="L43" class="LineNr"> 43 </span> <span class="muComment"># prefix substrings</span>
<span id="L44" class="LineNr"> 44 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">0</span>, <span class="Constant">0</span>, <span class="Constant">3</span>, out-ah
<span id="L45" class="LineNr"> 45 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L46" class="LineNr"> 46 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">""</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/null"</span>
<span id="L47" class="LineNr"> 47 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">""</span>, <span class="Constant">0</span>, <span class="Constant">3</span>, out-ah
<span id="L48" class="LineNr"> 48 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L49" class="LineNr"> 49 </span><span class="CommentedCode">#? print-string-to-real-screen out</span>
<span id="L50" class="LineNr"> 50 </span><span class="CommentedCode">#? print-string-to-real-screen "\n"</span>
<span id="L51" class="LineNr"> 51 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">""</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/empty"</span>
<span id="L52" class="LineNr"> 52 </span> <span class="muComment">#</span>
<span id="L53" class="LineNr"> 53 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">"abcde"</span>, <span class="Constant">0</span>, <span class="Constant">3</span>, out-ah
<span id="L54" class="LineNr"> 54 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L55" class="LineNr"> 55 </span><span class="CommentedCode">#? print-string-to-real-screen out</span>
<span id="L56" class="LineNr"> 56 </span><span class="CommentedCode">#? print-string-to-real-screen "\n"</span>
<span id="L57" class="LineNr"> 57 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">"abc"</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/truncate"</span>
<span id="L58" class="LineNr"> 58 </span> <span class="muComment">#</span>
<span id="L59" class="LineNr"> 59 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">"abcde"</span>, <span class="Constant">0</span>, <span class="Constant">5</span>, out-ah
<span id="L60" class="LineNr"> 60 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L61" class="LineNr"> 61 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">"abcde"</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/all"</span>
<span id="L62" class="LineNr"> 62 </span> <span class="muComment">#</span>
<span id="L63" class="LineNr"> 63 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">"abcde"</span>, <span class="Constant">0</span>, <span class="Constant">7</span>, out-ah
<span id="L64" class="LineNr"> 64 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L65" class="LineNr"> 65 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">"abcde"</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/too-small"</span>
<span id="L66" class="LineNr"> 66 </span> <span class="muComment"># substrings outside string</span>
<span id="L67" class="LineNr"> 67 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">"abcde"</span>, <span class="Constant">6</span>, <span class="Constant">1</span>, out-ah
<span id="L68" class="LineNr"> 68 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L69" class="LineNr"> 69 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">""</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/start-too-large"</span>
<span id="L70" class="LineNr"> 70 </span> <span class="muComment"># trim prefix</span>
<span id="L71" class="LineNr"> 71 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">""</span>, <span class="Constant">2</span>, <span class="Constant">3</span>, out-ah
<span id="L72" class="LineNr"> 72 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L73" class="LineNr"> 73 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">""</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/middle-empty"</span>
<span id="L74" class="LineNr"> 74 </span> <span class="muComment">#</span>
<span id="L75" class="LineNr"> 75 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">"abcde"</span>, <span class="Constant">1</span>, <span class="Constant">2</span>, out-ah
<span id="L76" class="LineNr"> 76 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L77" class="LineNr"> 77 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">"bc"</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/middle-truncate"</span>
<span id="L78" class="LineNr"> 78 </span> <span class="muComment">#</span>
<span id="L79" class="LineNr"> 79 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">"abcde"</span>, <span class="Constant">1</span>, <span class="Constant">4</span>, out-ah
<span id="L80" class="LineNr"> 80 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L81" class="LineNr"> 81 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">"bcde"</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/middle-all"</span>
<span id="L82" class="LineNr"> 82 </span> <span class="muComment">#</span>
<span id="L83" class="LineNr"> 83 </span> <a href='411string.mu.html#L2'>substring</a> <span class="Constant">"abcde"</span>, <span class="Constant">1</span>, <span class="Constant">5</span>, out-ah
<span id="L84" class="LineNr"> 84 </span> <span class="PreProc">var</span> out/<span class="Constant">eax</span>: (addr array byte) <span class="SpecialChar"><-</span> <a href='120allocate.subx.html#L256'>lookup</a> *out-ah
<span id="L85" class="LineNr"> 85 </span> <a href='105string-equal.subx.html#L220'>check-strings-equal</a> out, <span class="Constant">"bcde"</span>, <span class="Constant">"F - <a href='411string.mu.html#L40'>test-substring</a>/middle-too-small"</span>
<span id="L86" class="LineNr"> 86 </span><span class="Delimiter">}</span>
<span id="L87" class="LineNr"> 87 </span>
<span id="L88" class="LineNr"> 88 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='411string.mu.html#L88'>split-string</a></span> in: (addr array byte), delim: grapheme, out: (addr handle array (handle array byte)) <span class="Delimiter">{</span>
<span id="L89" class="LineNr"> 89 </span> <span class="PreProc">var</span> in-stream: (stream byte <span class="Constant">0x100</span>)
<span id="L90" class="LineNr"> 90 </span> <span class="PreProc">var</span> in-stream-addr/<span class="Constant">esi</span>: (addr stream byte) <span class="SpecialChar"><-</span> address in-stream
<span id="L91" class="LineNr"> 91 </span> <a href='108write.subx.html#L24'>write</a> in-stream-addr, in
<span id="L92" class="LineNr"> 92 </span> <span class="PreProc">var</span> tokens-stream: (stream (handle array byte) <span class="Constant">0x100</span>)
<span id="L93" class="LineNr"> 93 </span> <span class="PreProc">var</span> tokens-stream-addr/<span class="Constant">edi</span>: (addr stream (handle array byte)) <span class="SpecialChar"><-</span> address tokens-stream
<span id="L94" class="LineNr"> 94 </span> <span class="PreProc">var</span> curr-stream: (stream byte <span class="Constant">0x100</span>)
<span id="L95" class="LineNr"> 95 </span> <span class="PreProc">var</span> curr-stream-addr/<span class="Constant">ecx</span>: (addr stream byte) <span class="SpecialChar"><-</span> address curr-stream
<span id="L96" class="LineNr"> 96 </span> $split-string:core: <span class="Delimiter">{</span>
<span id="L97" class="LineNr"> 97 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> <a href='403unicode.mu.html#L158'>read-grapheme</a> in-stream-addr
<span id="L98" class="LineNr"> 98 </span> compare g, <span class="Constant">0xffffffff</span>
<span id="L99" class="LineNr"> 99 </span> <span class="PreProc">break-if-=</span>
<span id="L100" class="LineNr">100 </span><span class="CommentedCode">#? print-grapheme-to-real-screen g</span>
<span id="L101" class="LineNr">101 </span><span class="CommentedCode">#? print-string-to-real-screen "\n"</span>
<span id="L102" class="LineNr">102 </span> compare g, delim
<span id="L103" class="LineNr">103 </span> <span class="Delimiter">{</span>
<span id="L104" class="LineNr">104 </span> <span class="PreProc">break-if-!=</span>
<span id="L105" class="LineNr">105 </span> <span class="muComment"># token complete; flush</span>
<span id="L106" class="LineNr">106 </span> <span class="PreProc">var</span> token: (handle array byte)
<span id="L107" class="LineNr">107 </span> <span class="PreProc">var</span> token-ah/<span class="Constant">eax</span>: (addr handle array byte) <span class="SpecialChar"><-</span> address token
<span id="L108" class="LineNr">108 </span> <a href='310copy-bytes.subx.html#L59'>stream-to-array</a> curr-stream-addr, token-ah
<span id="L109" class="LineNr">109 </span> <a href='309stream.subx.html#L54'>write-to-stream</a> tokens-stream-addr, token-ah
<span id="L110" class="LineNr">110 </span> <a href='106stream.subx.html#L17'>clear-stream</a> curr-stream-addr
<span id="L111" class="LineNr">111 </span> <span class="PreProc">loop</span> $split-string:core
<span id="L112" class="LineNr">112 </span> <span class="Delimiter">}</span>
<span id="L113" class="LineNr">113 </span> <a href='403unicode.mu.html#L379'>write-grapheme</a> curr-stream-addr, g
<span id="L114" class="LineNr">114 </span> <span class="PreProc">loop</span>
<span id="L115" class="LineNr">115 </span> <span class="Delimiter">}</span>
<span id="L116" class="LineNr">116 </span> <a href='310copy-bytes.subx.html#L59'>stream-to-array</a> tokens-stream-addr, out
<span id="L117" class="LineNr">117 </span><span class="Delimiter">}</span>
<span id="L118" class="LineNr">118 </span>
<span id="L119" class="LineNr">119 </span><span class="PreProc">fn</span> <span class="muTest"><a href='411string.mu.html#L119'>test-split-string</a></span> <span class="Delimiter">{</span>
<span id="L120" class="LineNr">120 </span> <span class="PreProc">var</span> out-h: (handle array (handle array byte))
<span id="L121" class="LineNr">121 </span> <span class="PreProc">var</span> out-ah/<span class="Constant">edi</span>: (addr handle array (handle array byte)) <span class="SpecialChar"><-</span> address out-h
<span id="L122" class="LineNr">122 </span> <span class="muComment"># prefix substrings</span>
<span id="L123" class="LineNr">123 </span> <a href='411string.mu.html#L88'>split-string</a> <span class="Constant">"bab"</span>, <span class="Constant">0x61</span>, out-ah
<span id="L124" class="LineNr">124 </span> <span class="muComment"># no crash</span>
<span id="L125" class="LineNr">125 </span><span class="Delimiter">}</span>
</pre>
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