https://wiki.luatex.org/api.php?action=feedcontributions&feedformat=atom&user=Arthur 2026-04-22T12:51:28Z User contributions MediaWiki 1.31.1 https://wiki.luatex.org/index.php?title=Traversing_TeX_nodes&diff=171 2013-05-19T12:02:33Z

<p>Arthur: Restoring character with garbled encoding</p> <hr /> <div>== Traversing TeX nodes ==<br /> <br /> Put this code at the beginning of any TeX file:<br /> <br /> &lt;pre&gt;<br /> \directlua{<br /> local glyph = node.id(&#039;glyph&#039;)<br /> local hlist = node.id(&#039;hlist&#039;)<br /> local vlist = node.id(&#039;vlist&#039;)<br /> <br /> function gothru(h,prof)<br /> for t in node.traverse(h) do<br /> texio.write_nl(string.rep(&quot;...&quot;,prof) .. &#039;NODE type=&#039; .. node.type(t.id) .. &#039; subtype=&#039; .. t.subtype )<br /> if t.id == hlist or t.id == vlist then<br /> texio.write(&#039; w=&#039; .. t.width .. &#039; h=&#039; .. t.height .. &#039; d=&#039; .. t.depth .. &#039; s=&#039; .. t.shift )<br /> gothru(t.list,prof+1)<br /> end<br /> if t.id == glyph then<br /> texio.write(&#039; font=&#039; .. t.font .. &#039; char=&#039; .. t.char .. &#039; width=&#039; .. font.fonts[t.font].characters[t.char][&#039;width&#039;])<br /> end<br /> end<br /> end<br /> <br /> callback.register(&#039;pre_linebreak_filter&#039;,<br /> function(h)<br /> gothru(h,0) <br /> return true <br /> end<br /> )<br /> }<br /> &lt;/pre&gt;<br /> <br /> It will display a list of all nodes on the terminal and in the log file. For example, for the document<br /> <br /> &lt;pre&gt;<br /> \font\x=omlgc<br /> \x blε bla bla bla<br /> &lt;/pre&gt;<br /> <br /> which contains a Greek letter (in UTF-8), you will get:<br /> <br /> &lt;pre&gt;<br /> This is luaTeX, Version 3.141592-snapshot-2007062922 (Web2C 7.5.6)<br /> (<br /> NODE type=whatsit subtype=6<br /> NODE type=hlist subtype=0<br /> NODE type=glyph subtype=0 font=51 char=98<br /> NODE type=glyph subtype=0 font=51 char=108<br /> NODE type=glyph subtype=0 font=51 char=941<br /> NODE type=glue subtype=0<br /> NODE type=glyph subtype=0 font=51 char=98<br /> NODE type=glyph subtype=0 font=51 char=108<br /> NODE type=glyph subtype=0 font=51 char=97<br /> NODE type=glue subtype=0<br /> NODE type=glyph subtype=0 font=51 char=98<br /> NODE type=glyph subtype=0 font=51 char=108<br /> NODE type=glyph subtype=0 font=51 char=97<br /> NODE type=glue subtype=0<br /> NODE type=glyph subtype=0 font=51 char=98<br /> NODE type=glyph subtype=0 font=51 char=108<br /> NODE type=glyph subtype=0 font=51 char=97<br /> NODE type=glue subtype=0<br /> Underfull \hbox (badness 10000) in paragraph at lines 14--15<br /> <br /> [1] )<br /> &lt;/pre&gt;<br /> <br /> Be aware of the fact that the nodes will be created only if the glyph requested indeed exists in the font.<br /> <br /> [[User:Yannis.Haralambous|Yannis.Haralambous]] 02:52, 4 July 2007 (EDT)</div>

Arthur