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<h1>Example <code>testxml.lua</code></h1>
<pre>
<span class="comment">-- an example showing 'pl.lexer' doing some serious work.
</span><span class="comment">-- The resulting Lua table is in the same LOM format used by luaexpat.
</span><span class="comment">-- This is (clearly) not a professional XML parser, so don't use it
</span><span class="comment">-- on your homework!
</span>
<span class="global">require</span> <span class="string">'pl'</span>
<span class="keyword">local</span> append = <span class="global">table</span>.insert
<span class="keyword">local</span> skipws,expecting = lexer.skipws,lexer.expecting
<span class="keyword">function</span> parse_element (tok,tag)
<span class="keyword">local</span> tbl,t,v,attrib
tbl = {}
tbl.tag = tag <span class="comment">-- LOM 'tag' is the element tag
</span> t,v = skipws(tok)
<span class="keyword">while</span> v ~= <span class="string">'/'</span> <span class="keyword">and</span> v ~= <span class="string">'&gt;'</span> <span class="keyword">do</span>
<span class="keyword">if</span> t ~= <span class="string">'iden'</span> <span class="keyword">then</span> error(<span class="string">'expecting attribute identifier'</span>) <span class="keyword">end</span>
attrib = v
expecting(tok,<span class="string">'='</span>)
v = expecting(tok,<span class="string">'string'</span>)
<span class="comment">-- LOM: 'attr' subtable contains attrib/value pairs and an ordered list of attribs
</span> <span class="keyword">if</span> <span class="keyword">not</span> tbl.attr <span class="keyword">then</span> tbl.attr = {} <span class="keyword">end</span>
tbl.attr[attrib] = v
append(tbl.attr,attrib)
t,v = skipws(tok)
<span class="keyword">end</span>
<span class="keyword">if</span> v == <span class="string">'/'</span> <span class="keyword">then</span>
expecting(tok,<span class="string">'&gt;'</span>)
<span class="keyword">return</span> tbl
<span class="keyword">end</span>
<span class="comment">-- pick up element data
</span> t,v = tok()
<span class="keyword">while</span> <span class="keyword">true</span> <span class="keyword">do</span>
<span class="keyword">if</span> t == <span class="string">'&lt;'</span> <span class="keyword">then</span>
t,v = skipws(tok)
<span class="keyword">if</span> t == <span class="string">'/'</span> <span class="keyword">then</span> <span class="comment">-- element end tag
</span> t,v = tok()
<span class="keyword">if</span> t == <span class="string">'&gt;'</span> <span class="keyword">then</span> <span class="keyword">return</span> tbl <span class="keyword">end</span>
<span class="keyword">if</span> t == <span class="string">'iden'</span> <span class="keyword">and</span> v == tag <span class="keyword">then</span>
<span class="keyword">if</span> tok() == <span class="string">'&gt;'</span> <span class="keyword">then</span> <span class="keyword">return</span> tbl <span class="keyword">end</span>
<span class="keyword">end</span>
error(<span class="string">'expecting end tag '</span>..tag)
<span class="keyword">else</span>
append(tbl,parse_element(tok,v)) <span class="comment">-- LOM: child elements added to table
</span> t,v = skipws(tok)
<span class="keyword">end</span>
<span class="keyword">else</span>
append(tbl,v) <span class="comment">-- LOM: text added to table
</span> t,v = skipws(tok)
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="keyword">function</span> parse_xml (tok)
<span class="keyword">local</span> t,v = skipws(tok)
<span class="keyword">while</span> t == <span class="string">'&lt;'</span> <span class="keyword">do</span>
t,v = tok()
<span class="keyword">if</span> t == <span class="string">'?'</span> <span class="keyword">or</span> t == <span class="string">'!'</span> <span class="keyword">then</span>
<span class="comment">-- skip meta stuff and commentary
</span> <span class="keyword">repeat</span> t = tok() <span class="keyword">until</span> t == <span class="string">'&gt;'</span>
t,v = expecting(tok,<span class="string">'&lt;'</span>)
<span class="keyword">else</span>
<span class="keyword">return</span> parse_element(tok,v)
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="keyword">end</span>
s = <span class="string">[[
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;sensor name="closure-meter-2" id="7D7D0600006F0D00" loc="100,100,0" device="closure-meter" init="true"&gt;
&lt;detector name="closure-meter" phenomenon="closure" units="mm" id="1"
vmin="0" vmax="5000" device="closure-meter" calib="0,0;5000,5000"
sampling_interval="25000" measurement_interval="600000"
/&gt;
&lt;/sensor&gt;
]]</span>
<span class="keyword">local</span> tok = lexer.scan(s,<span class="keyword">nil</span>,{space=<span class="keyword">false</span>},{<span class="global">string</span>=<span class="keyword">true</span>})
<span class="keyword">local</span> res = parse_xml(tok)
<span class="global">print</span>(pretty.write(res))
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