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<h1>Penlight</h1>
<ul>
<li><a href="../index.html">Index</a></li>
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<h2>Examples</h2>
<ul>
<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><a href="../examples/test-symbols.lua.html">test-symbols.lua</a></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><strong>testglobal.lua</strong></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>
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<h2>Modules</h2>
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<li><a href="../modules/config.html">config</a></li>
<li><a href="../modules/pl.html">pl</a></li>
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<li><a href="../modules/pl.Map.html">pl.Map</a></li>
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<li><a href="../modules/pl.lapp.html">pl.lapp</a></li>
<li><a href="../modules/pl.lexer.html">pl.lexer</a></li>
<li><a href="../modules/pl.luabalanced.html">pl.luabalanced</a></li>
<li><a href="../modules/pl.operator.html">pl.operator</a></li>
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<li><a href="../modules/pl.permute.html">pl.permute</a></li>
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<li><a href="../modules/pl.seq.html">pl.seq</a></li>
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<li><a href="../modules/pl.utils.html">pl.utils</a></li>
<li><a href="../modules/pl.xml.html">pl.xml</a></li>
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<h2>Topics</h2>
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<li><a href="../topics/01-introduction.md.html">01-introduction.md</a></li>
<li><a href="../topics/02-arrays.md.html">02-arrays.md</a></li>
<li><a href="../topics/03-strings.md.html">03-strings.md</a></li>
<li><a href="../topics/04-paths.md.html">04-paths.md</a></li>
<li><a href="../topics/05-dates.md.html">05-dates.md</a></li>
<li><a href="../topics/06-data.md.html">06-data.md</a></li>
<li><a href="../topics/07-functional.md.html">07-functional.md</a></li>
<li><a href="../topics/08-additional.md.html">08-additional.md</a></li>
<li><a href="../topics/09-discussion.md.html">09-discussion.md</a></li>
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<h1>Example <code>testglobal.lua</code></h1>
<pre>
<span class="comment">-- very simple lexer program which looks at all identifiers in a Lua
</span><span class="comment">-- file and checks whether they're in the global namespace.
</span><span class="comment">-- At the end, we dump out the result of count_map, which will give us
</span><span class="comment">-- unique identifiers with their usage count.
</span><span class="comment">-- (an example of a program which itself needs to be careful about what
</span><span class="comment">-- goes into the global namespace)
</span>
<span class="keyword">local</span> utils = <span class="global">require</span> <span class="string">'pl.utils'</span>
<span class="keyword">local</span> file = <span class="global">require</span> <span class="string">'pl.file'</span>
<span class="keyword">local</span> lexer = <span class="global">require</span> <span class="string">'pl.lexer'</span>
<span class="keyword">local</span> List = <span class="global">require</span> <span class="string">'pl.List'</span>
<span class="keyword">local</span> pretty = <span class="global">require</span> <span class="string">'pl.pretty'</span>
<span class="keyword">local</span> seq = <span class="global">require</span> <span class="string">'pl.seq'</span>
utils.on_error <span class="string">'quit'</span>
<span class="keyword">local</span> txt,err = file.read(arg[<span class="number">1</span>] <span class="keyword">or</span> <span class="string">'testglobal.lua'</span>)
<span class="keyword">local</span> globals = List()
<span class="keyword">for</span> t,v <span class="keyword">in</span> lexer.lua(txt) <span class="keyword">do</span>
<span class="keyword">if</span> t == <span class="string">'iden'</span> <span class="keyword">and</span> <span class="global">rawget</span>(_G,v) <span class="keyword">then</span>
globals:append(v)
<span class="keyword">end</span>
<span class="keyword">end</span>
pretty.dump(seq.count_map(globals))</pre>
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