<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <head> <title>Penlight Documentation</title> <link rel="stylesheet" href="../ldoc_fixed.css" type="text/css" /> </head> <body> <div id="container"> <div id="product"> <div id="product_logo"></div> <div id="product_name"><big><b></b></big></div> <div id="product_description"></div> </div> <!-- id="product" --> <div id="main"> <!-- Menu --> <div id="navigation"> <br/> <h1>Penlight</h1> <ul> <li><a href="../index.html">Index</a></li> </ul> <h2>Examples</h2> <ul class="$(kind=='Topics' and '' or 'nowrap'"> <li><a href="../examples/seesubst.lua.html">seesubst.lua</a></li> <li><a href="../examples/sipscan.lua.html">sipscan.lua</a></li> <li><a href="../examples/symbols.lua.html">symbols.lua</a></li> <li><a href="../examples/test-cmp.lua.html">test-cmp.lua</a></li> <li><a href="../examples/test-data.lua.html">test-data.lua</a></li> <li><a href="../examples/test-listcallbacks.lua.html">test-listcallbacks.lua</a></li> <li><a href="../examples/test-pretty.lua.html">test-pretty.lua</a></li> <li><strong>test-symbols.lua</strong></li> <li><a href="../examples/testapp.lua.html">testapp.lua</a></li> <li><a href="../examples/testclone.lua.html">testclone.lua</a></li> <li><a href="../examples/testconfig.lua.html">testconfig.lua</a></li> <li><a href="../examples/testglobal.lua.html">testglobal.lua</a></li> <li><a href="../examples/testinputfields.lua.html">testinputfields.lua</a></li> <li><a href="../examples/testinputfields2.lua.html">testinputfields2.lua</a></li> <li><a href="../examples/testxml.lua.html">testxml.lua</a></li> <li><a href="../examples/which.lua.html">which.lua</a></li> </ul> <h2>Libraries</h2> <ul class="$(kind=='Topics' and '' or 'nowrap'"> <li><a href="../libraries/pl.html">pl</a></li> <li><a href="../libraries/pl.Set.html">pl.Set</a></li> <li><a href="../libraries/pl.app.html">pl.app</a></li> <li><a href="../libraries/pl.array2d.html">pl.array2d</a></li> <li><a href="../libraries/pl.class.html">pl.class</a></li> <li><a href="../libraries/pl.compat.html">pl.compat</a></li> <li><a href="../libraries/pl.comprehension.html">pl.comprehension</a></li> <li><a href="../libraries/pl.config.html">pl.config</a></li> <li><a href="../libraries/pl.data.html">pl.data</a></li> <li><a href="../libraries/pl.dir.html">pl.dir</a></li> <li><a href="../libraries/pl.file.html">pl.file</a></li> <li><a href="../libraries/pl.func.html">pl.func</a></li> <li><a href="../libraries/pl.import_into.html">pl.import_into</a></li> <li><a href="../libraries/pl.input.html">pl.input</a></li> <li><a href="../libraries/pl.lapp.html">pl.lapp</a></li> <li><a href="../libraries/pl.lexer.html">pl.lexer</a></li> <li><a href="../libraries/pl.luabalanced.html">pl.luabalanced</a></li> <li><a href="../libraries/pl.operator.html">pl.operator</a></li> <li><a href="../libraries/pl.path.html">pl.path</a></li> <li><a href="../libraries/pl.permute.html">pl.permute</a></li> <li><a href="../libraries/pl.pretty.html">pl.pretty</a></li> <li><a href="../libraries/pl.seq.html">pl.seq</a></li> <li><a href="../libraries/pl.sip.html">pl.sip</a></li> <li><a href="../libraries/pl.strict.html">pl.strict</a></li> <li><a href="../libraries/pl.stringio.html">pl.stringio</a></li> <li><a href="../libraries/pl.stringx.html">pl.stringx</a></li> <li><a href="../libraries/pl.tablex.html">pl.tablex</a></li> <li><a href="../libraries/pl.template.html">pl.template</a></li> <li><a href="../libraries/pl.test.html">pl.test</a></li> <li><a href="../libraries/pl.text.html">pl.text</a></li> <li><a href="../libraries/pl.types.html">pl.types</a></li> <li><a href="../libraries/pl.url.html">pl.url</a></li> <li><a href="../libraries/pl.utils.html">pl.utils</a></li> <li><a href="../libraries/pl.xml.html">pl.xml</a></li> </ul> <h2>Classes</h2> <ul class="$(kind=='Topics' and '' or 'nowrap'"> <li><a href="../classes/pl.Date.html">pl.Date</a></li> <li><a href="../classes/pl.List.html">pl.List</a></li> <li><a href="../classes/pl.Map.html">pl.Map</a></li> <li><a href="../classes/pl.MultiMap.html">pl.MultiMap</a></li> <li><a href="../classes/pl.OrderedMap.html">pl.OrderedMap</a></li> </ul> <h2>Manual</h2> <ul class="$(kind=='Topics' and '' or 'nowrap'"> <li><a href="../manual/01-introduction.md.html">Introduction</a></li> <li><a href="../manual/02-arrays.md.html">Tables and Arrays</a></li> <li><a href="../manual/03-strings.md.html">Strings. Higher-level operations on strings.</a></li> <li><a href="../manual/04-paths.md.html">Paths and Directories</a></li> <li><a href="../manual/05-dates.md.html">Date and Time</a></li> <li><a href="../manual/06-data.md.html">Data</a></li> <li><a href="../manual/07-functional.md.html">Functional Programming</a></li> <li><a href="../manual/08-additional.md.html">Additional Libraries</a></li> <li><a href="../manual/09-discussion.md.html">Technical Choices</a></li> </ul> </div> <div id="content"> <h2>test-symbols.lua</h2> <pre> <span class="global">require</span> <span class="string">'pl'</span> <span class="comment">-- force us to look in the script's directory when requiring... </span>app.require_here() <span class="global">require</span> <span class="string">'symbols'</span> <span class="keyword">local</span> MT = <span class="global">getmetatable</span>(_1) add = MT.__add mul = MT.__mul pow = MT.__pow <span class="keyword">function</span> testeq (e1,e2) <span class="keyword">if</span> <span class="keyword">not</span> equals(e1,e2) <span class="keyword">then</span> <span class="global">print</span> (<span class="string">'Not equal'</span>,repr(e1),repr(e2)) <span class="keyword">end</span> <span class="keyword">end</span> sin = register(<span class="global">math</span>.sin,<span class="string">'sin'</span>) f = register(<span class="keyword">function</span>(x,y,z) <span class="keyword">end</span>) <span class="comment">--[[ testeq (_1,_1) testeq (_1+_2,_1+_2) testeq (_1 + 3*_2,_1 + 3*_2) testeq (_2+_1,_1+_2) testeq (sin(_1),sin(_1)) testeq (1+f(10,20,'ok'),f(10,20,'ok')+1) --]]</span> <span class="keyword">function</span> testexpand (e) <span class="global">print</span>(repr(fold(expand(e)))) <span class="comment">--fold </span><span class="keyword">end</span> <span class="comment">--[[ testexpand (a*(a+1)) testexpand ((x+2)*(b+1)) ]]</span><span class="comment">-- </span> <span class="keyword">function</span> testfold (e) <span class="global">print</span>(repr(fold(e))) <span class="keyword">end</span> a,b,c,x,y = Var <span class="string">'a,b,c,x,y'</span> <span class="comment">--~ testfold(_1 + _2) </span><span class="comment">--~ testfold(add(10,20)) </span><span class="comment">--~ testfold(add(mul(2,_1),mul(3,_2))) </span><span class="comment">--[[ testfold(sin(a)) e = a^(b+2) testfold(e) bindval(b,1) testfold(e) bindval(a,2) testfold(e) bindval(a) bindval(b) ]]</span> <span class="keyword">function</span> testdiff (e) balance(e) e = diff(e,x) balance(e) <span class="global">print</span>(<span class="string">'+ '</span>,e) e = fold(e) <span class="global">print</span>(<span class="string">'- '</span>,e) <span class="keyword">end</span> testdiff(x^<span class="number">2</span>+<span class="number">1</span>) testdiff(<span class="number">3</span>*x^<span class="number">2</span>) testdiff(x^<span class="number">2</span> + <span class="number">2</span>*x^<span class="number">3</span>) testdiff(x^<span class="number">2</span> + <span class="number">2</span>*a*x^<span class="number">3</span> + x^<span class="number">4</span>) testdiff(<span class="number">2</span>*a*x^<span class="number">3</span>) testdiff(x*x*x)</pre> </div> <!-- id="content" --> </div> <!-- id="main" --> <div id="about"> <i>generated by <a href="http://github.com/stevedonovan/LDoc">LDoc 1.4.3</a></i> <i style="float:right;">Last updated 2015-03-21 18:49:03 </i> </div> <!-- id="about" --> </div> <!-- id="container" --> </body> </html>