diff options
| author | Kartik Agaram <vc@akkartik.com> | 2019-07-27 16:01:55 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-07-27 17:47:59 -0700 |
| commit | 6e1eeeebfb453fa7c871869c19375ce60fbd7413 (patch) | |
| tree | 539c4a3fdf1756ae79770d5c4aaf6366f1d1525e /html/exception2.mu.html | |
| parent | 8846a7f85cc04b77b2fe8a67b6d317723437b00c (diff) | |
| download | mu-6e1eeeebfb453fa7c871869c19375ce60fbd7413.tar.gz | |
5485 - promote SubX to top-level
Diffstat (limited to 'html/exception2.mu.html')
| -rw-r--r-- | html/exception2.mu.html | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/html/exception2.mu.html b/html/exception2.mu.html deleted file mode 100644 index ffec315b..00000000 --- a/html/exception2.mu.html +++ /dev/null @@ -1,125 +0,0 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> -<html> -<head> -<meta http-equiv="content-type" content="text/html; charset=UTF-8"> -<title>Mu - exception2.mu</title> -<meta name="Generator" content="Vim/8.0"> -<meta name="plugin-version" content="vim7.4_v2"> -<meta name="syntax" content="none"> -<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> -<meta name="colorscheme" content="minimal-light"> -<style type="text/css"> -<!-- -pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; } -body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; } -a { color:inherit; } -* { font-size:12pt; font-size: 1em; } -.muControl { color: #804000; } -.muRecipe { color: #ff8700; } -.LineNr { } -.muData { color: #ffff00; } -.Delimiter { color: #c000c0; } -.Constant { color: #008787; } -.Special { color: #ff6060; } -.Comment { color: #005faf; } ---> -</style> - -<script type='text/javascript'> -<!-- - -/* function to open any folds containing a jumped-to line before jumping to it */ -function JumpToLine() -{ - var lineNum; - lineNum = window.location.hash; - lineNum = lineNum.substr(1); /* strip off '#' */ - - if (lineNum.indexOf('L') == -1) { - lineNum = 'L'+lineNum; - } - lineElem = document.getElementById(lineNum); - /* Always jump to new location even if the line was hidden inside a fold, or - * we corrected the raw number to a line ID. - */ - if (lineElem) { - lineElem.scrollIntoView(true); - } - return true; -} -if ('onhashchange' in window) { - window.onhashchange = JumpToLine; -} - ---> -</script> -</head> -<body onload='JumpToLine();'> -<a href='https://github.com/akkartik/mu/blob/master/exception2.mu'>https://github.com/akkartik/mu/blob/master/exception2.mu</a> -<pre id='vimCodeElement'> -<span id="L1" class="LineNr"> 1 </span><span class="Comment"># Example program showing exceptions built out of delimited continuations.</span> -<span id="L2" class="LineNr"> 2 </span><span class="Comment"># Slightly less klunky than exception1.mu.</span> -<span id="L3" class="LineNr"> 3 </span> -<span id="L4" class="LineNr"> 4 </span><span class="Comment"># Since Mu is statically typed, we can't build an all-purpose higher-order</span> -<span id="L5" class="LineNr"> 5 </span><span class="Comment"># function called 'try'; it wouldn't know how many arguments the function</span> -<span id="L6" class="LineNr"> 6 </span><span class="Comment"># passed to it needs to take, what their types are, etc. Instead, until Mu</span> -<span id="L7" class="LineNr"> 7 </span><span class="Comment"># gets macros we'll directly use the continuation primitives.</span> -<span id="L8" class="LineNr"> 8 </span> -<span id="L9" class="LineNr"> 9 </span><span class="muData">exclusive-container</span> <a href='exception2.mu.html#L9'>error-or</a>:_elem [ -<span id="L10" class="LineNr">10 </span> error:text -<span id="L11" class="LineNr">11 </span> value:_elem -<span id="L12" class="LineNr">12 </span>] -<span id="L13" class="LineNr">13 </span> -<span id="L14" class="LineNr">14 </span><span class="muRecipe">def</span> <a href='exception2.mu.html#L14'>main</a> [ -<span id="L15" class="LineNr">15 </span> <span class="Constant">local-scope</span> -<span id="L16" class="LineNr">16 </span> <a href='exception2.mu.html#L21'>foo</a><span class="Constant"> false/no-exception</span> -<span id="L17" class="LineNr">17 </span> <a href='exception2.mu.html#L21'>foo</a><span class="Constant"> true/raise-exception</span> -<span id="L18" class="LineNr">18 </span>] -<span id="L19" class="LineNr">19 </span> -<span id="L20" class="LineNr">20 </span><span class="Comment"># example showing exception handling</span> -<span id="L21" class="LineNr">21 </span><span class="muRecipe">def</span> <a href='exception2.mu.html#L21'>foo</a> raise-exception?:bool [ -<span id="L22" class="LineNr">22 </span> <span class="Constant">local-scope</span> -<span id="L23" class="LineNr">23 </span> <span class="Constant">load-inputs</span> -<span id="L24" class="LineNr">24 </span> <span class="Comment"># To run an instruction of the form:</span> -<span id="L25" class="LineNr">25 </span> <span class="Comment"># try f ...</span> -<span id="L26" class="LineNr">26 </span> <span class="Comment"># write this:</span> -<span id="L27" class="LineNr">27 </span> <span class="Comment"># call-with-continuation-mark 999/exception-tag, f, ...</span> -<span id="L28" class="LineNr">28 </span> <span class="Comment"># By convention we reserve tag 999 for exceptions.</span> -<span id="L29" class="LineNr">29 </span> <span class="Comment">#</span> -<span id="L30" class="LineNr">30 </span> <span class="Comment"># The other inputs and outputs to 'call-with-continuation-mark' depend on</span> -<span id="L31" class="LineNr">31 </span> <span class="Comment"># the function it is called with.</span> -<span id="L32" class="LineNr">32 </span> _, result:<a href='exception2.mu.html#L9'>error-or</a>:num <span class="Special"><-</span> <span class="muControl">call-with-continuation-mark</span> <span class="Constant">999/exception-tag</span>, <a href='exception2.mu.html#L47'>f</a>, raise-exception? -<span id="L33" class="LineNr">33 </span> <span class="Delimiter">{</span> -<span id="L34" class="LineNr">34 </span> val:num, normal-exit?:bool <span class="Special"><-</span> maybe-convert result, <span class="Constant">value:variant</span> -<span id="L35" class="LineNr">35 </span> <span class="muControl">break-unless</span> normal-exit? -<span id="L36" class="LineNr">36 </span> $print <span class="Constant">[normal exit; result ]</span> val <span class="Constant">10/newline</span> -<span id="L37" class="LineNr">37 </span> <span class="Delimiter">}</span> -<span id="L38" class="LineNr">38 </span> <span class="Delimiter">{</span> -<span id="L39" class="LineNr">39 </span> err:text, error-exit?:bool <span class="Special"><-</span> maybe-convert result, <span class="Constant">error:variant</span> -<span id="L40" class="LineNr">40 </span> <span class="muControl">break-unless</span> error-exit? -<span id="L41" class="LineNr">41 </span> $print <span class="Constant">[error caught: ]</span> err <span class="Constant">10/newline</span> -<span id="L42" class="LineNr">42 </span> <span class="Delimiter">}</span> -<span id="L43" class="LineNr">43 </span>] -<span id="L44" class="LineNr">44 </span> -<span id="L45" class="LineNr">45 </span><span class="Comment"># Callee function that we catch exceptions in must always return using a</span> -<span id="L46" class="LineNr">46 </span><span class="Comment"># continuation.</span> -<span id="L47" class="LineNr">47 </span><span class="muRecipe">def</span> <a href='exception2.mu.html#L47'>f</a> raise-exception?:bool<span class="muRecipe"> -> </span>result:<a href='exception2.mu.html#L9'>error-or</a>:num [ -<span id="L48" class="LineNr">48 </span> <span class="Constant">local-scope</span> -<span id="L49" class="LineNr">49 </span> <span class="Constant">load-inputs</span> -<span id="L50" class="LineNr">50 </span> <span class="Delimiter">{</span> -<span id="L51" class="LineNr">51 </span> <span class="muControl">break-unless</span> raise-exception? -<span id="L52" class="LineNr">52 </span> <span class="Comment"># throw/raise</span> -<span id="L53" class="LineNr">53 </span> result <span class="Special"><-</span> merge <span class="Constant">0/error</span>, <span class="Constant">[error will robinson!]</span> -<span id="L54" class="LineNr">54 </span> <span class="muControl">return-continuation-until-mark</span> <span class="Constant">999/exception-tag</span>, result -<span id="L55" class="LineNr">55 </span> <span class="Delimiter">}</span> -<span id="L56" class="LineNr">56 </span> <span class="Comment"># 'normal' return; still uses the continuation mark</span> -<span id="L57" class="LineNr">57 </span> result <span class="Special"><-</span> merge <span class="Constant">1/value</span>,<span class="Constant"> 34</span> -<span id="L58" class="LineNr">58 </span> <span class="muControl">return-continuation-until-mark</span> <span class="Constant">999/exception-tag</span>, result -<span id="L59" class="LineNr">59 </span> <span class="Comment"># dead code just to avoid errors</span> -<span id="L60" class="LineNr">60 </span> result <span class="Special"><-</span> merge <span class="Constant">1/value</span>,<span class="Constant"> 0</span> -<span id="L61" class="LineNr">61 </span> <span class="muControl"> return</span> result -<span id="L62" class="LineNr">62 </span>] -</pre> -</body> -</html> -<!-- vim: set foldmethod=manual : --> |