Traversing TeX nodes - Revision history

Arthur: Restoring character with garbled encoding

2013-05-19T12:02:33Z

Restoring character with garbled encoding

Taco: Reverted edits by 193.212.103.173 (talk) to last revision by Patrick

2010-12-28T08:12:31Z

Reverted edits by 193.212.103.173 (talk) to last revision by Patrick

193.212.103.173: /* Traversing TeX nodes */

2010-12-28T05:20:00Z

‎Traversing TeX nodes

Patrick: Copied from the old bluwiki.com luatex wiki (is also licensed under the terms of the GNU FDL)

2010-12-07T21:04:43Z

Copied from the old bluwiki.com luatex wiki (is also licensed under the terms of the GNU FDL)

New page

== Traversing TeX nodes ==

Put this code at the beginning of any TeX file:

<pre>
\directlua{
local glyph = node.id('glyph')
local hlist = node.id('hlist')
local vlist = node.id('vlist')

function gothru(h,prof)
for t in node.traverse(h) do
texio.write_nl(string.rep("...",prof) .. 'NODE type=' .. node.type(t.id) .. ' subtype=' .. t.subtype )
if t.id == hlist or t.id == vlist then
texio.write(' w=' .. t.width .. ' h=' .. t.height .. ' d=' .. t.depth .. ' s=' .. t.shift )
gothru(t.list,prof+1)
end
if t.id == glyph then
texio.write(' font=' .. t.font .. ' char=' .. t.char .. ' width=' .. font.fonts[t.font].characters[t.char]['width'])
end
end
end

callback.register('pre_linebreak_filter',
function(h)
gothru(h,0)
return true
end
)
}
</pre>

It will display a list of all nodes on the terminal and in the log file. For example, for the document

<pre>
\font\x=omlgc
\x bl? bla bla bla
</pre>

which contains a Greek letter (in UTF-8), you will get:

<pre>
This is luaTeX, Version 3.141592-snapshot-2007062922 (Web2C 7.5.6)
(
NODE type=whatsit subtype=6
NODE type=hlist subtype=0
NODE type=glyph subtype=0 font=51 char=98
NODE type=glyph subtype=0 font=51 char=108
NODE type=glyph subtype=0 font=51 char=941
NODE type=glue subtype=0
NODE type=glyph subtype=0 font=51 char=98
NODE type=glyph subtype=0 font=51 char=108
NODE type=glyph subtype=0 font=51 char=97
NODE type=glue subtype=0
NODE type=glyph subtype=0 font=51 char=98
NODE type=glyph subtype=0 font=51 char=108
NODE type=glyph subtype=0 font=51 char=97
NODE type=glue subtype=0
NODE type=glyph subtype=0 font=51 char=98
NODE type=glyph subtype=0 font=51 char=108
NODE type=glyph subtype=0 font=51 char=97
NODE type=glue subtype=0
Underfull \hbox (badness 10000) in paragraph at lines 14--15

[1] )
</pre>

Be aware of the fact that the nodes will be created only if the glyph requested indeed exists in the font.

[[User:Yannis.Haralambous|Yannis.Haralambous]] 02:52, 4 July 2007 (EDT)

← Older revision		Revision as of 05:20, 28 December 2010
Line 1:		Line 1:
−	~~== Traversing TeX nodes ==~~	+	D6ZnzD <a href="http://lippdztrobdy.com/">lippdztrobdy</a>, [url=http://lpynykdfzzuy.com/]lpynykdfzzuy[/url], [link=http://chynmakugbbj.com/]chynmakugbbj[/link], http://lhapzbrslbcu.com/
−
−	~~Put this code at the beginning of any TeX file:~~
−
−	<~~pre>~~
−	~~\directlua{~~
−	~~local glyph = node.id('glyph')~~
−	~~local hlist = node.id('hlist')~~
−	~~local vlist~~ = ~~node.id('vlist')~~
−
−	~~function gothru(h,prof)~~
−	~~for t in node.traverse(h) do~~
−	~~texio.write_nl(string.rep(~~"..."~~,prof) .. 'NODE type=' .. node.type(t.id) .. ' subtype=' .. t.subtype )~~
−	~~if t.id == hlist or t.id == vlist then~~
−	~~texio.write(' w=' .. t.width .. ' h=' .. t.height .. ' d=' .. t.depth .. ' s=' .. t.shift )~~
−	~~gothru(t.list,prof+1)~~
−	~~end~~
−	~~if t.id == glyph then~~
−	~~texio.write(' font=' .. t.font .. ' char=' .. t.char .. ' width=' .. font.fonts[t.font].characters[t.char]['width'])~~
−	~~end~~
−	~~end~~
−	~~end~~
−
−	~~callback.register('pre_linebreak_filter',~~
−	~~function(h)~~
−	~~gothru(h,0)~~
−	~~return true~~
−	~~end~~
−	)
−	}
−	~~</pre~~>
−
−	~~It will display a list of all nodes on the terminal and in the log file. For example, for the document~~
−
−	~~<pre>~~
−	~~\font\x=omlgc~~
−	~~\x bl? bla bla bla~~
−	</~~pre>~~
−
−	~~which contains~~ a ~~Greek letter (in UTF-8), you will get:~~
−
−	~~<pre~~>
−	~~This is luaTeX~~, ~~Version 3.141592-snapshot-2007062922 (Web2C 7.5.6)~~
−	(
−	~~NODE type~~=~~whatsit subtype=6~~
−	~~NODE type=hlist subtype=0~~
−	~~NODE type=glyph subtype=0 font=51 char=98~~
−	~~NODE type=glyph subtype=0 font=51 char=108~~
−	~~NODE type=glyph subtype=0 font=51 char=941~~
−	~~NODE type=glue subtype=0~~
−	~~NODE type=glyph subtype=0 font=51 char=98~~
−	~~NODE type=glyph subtype=0 font=51 char=108~~
−	~~NODE type=glyph subtype=0 font=51 char=97~~
−	~~NODE type=glue subtype=0~~
−	~~NODE type=glyph subtype=0 font=51 char=98~~
−	~~NODE type=glyph subtype=0 font=51 char=108~~
−	~~NODE type=glyph subtype=0 font=51 char=97~~
−	~~NODE type=glue subtype=0~~
−	~~NODE type=glyph subtype=0 font=51 char=98~~
−	~~NODE type=glyph subtype=0 font=51 char=108~~
−	~~NODE type=glyph subtype=0 font=51 char=97~~
−	~~NODE type=glue subtype=0~~
−	~~Underfull \hbox (badness 10000) in paragraph at lines 14--15~~
−
−	~~[1] )~~
−	</~~pre>~~
−
−	~~Be aware of the fact that the nodes will be created only if the glyph requested indeed exists in the font~~.
−
−	[[~~User~~:~~Yannis~~.~~Haralambous\|Yannis.Haralambous~~]] 02:~~52, 4 July 2007 (EDT)~~

@@ Line 35: / Line 35: @@
 <pre>
 \font\x=omlgc
-\x bl? bla bla bla
+\x blε bla bla bla
 </pre>

← Older revision		Revision as of 08:12, 28 December 2010
Line 1:		Line 1:
−	~~D6ZnzD~~ ~~<a href~~="~~http:~~/~~/lippdztrobdy~~.~~com/"~~>~~lippdztrobdy~~</a>, [~~url=http:~~/~~/lpynykdfzzuy~~.~~com/]lpynykdfzzuy~~[~~/url],~~ [~~link=http~~:~~//chynmakugbbj~~.~~com/~~]~~chynmakugbbj[/link~~], ~~http://lhapzbrslbcu.com/~~	+	== Traversing TeX nodes ==
		+
		+	Put this code at the beginning of any TeX file:
		+
		+	<pre>
		+	\directlua{
		+	local glyph = node.id('glyph')
		+	local hlist = node.id('hlist')
		+	local vlist = node.id('vlist')
		+
		+	function gothru(h,prof)
		+	for t in node.traverse(h) do
		+	texio.write_nl(string.rep("...",prof) .. 'NODE type=' .. node.type(t.id) .. ' subtype=' .. t.subtype )
		+	if t.id == hlist or t.id == vlist then
		+	texio.write(' w=' .. t.width .. ' h=' .. t.height .. ' d=' .. t.depth .. ' s=' .. t.shift )
		+	gothru(t.list,prof+1)
		+	end
		+	if t.id == glyph then
		+	texio.write(' font=' .. t.font .. ' char=' .. t.char .. ' width=' .. font.fonts[t.font].characters[t.char]['width'])
		+	end
		+	end
		+	end
		+
		+	callback.register('pre_linebreak_filter',
		+	function(h)
		+	gothru(h,0)
		+	return true
		+	end
		+	)
		+	}
		+	</pre>
		+
		+	It will display a list of all nodes on the terminal and in the log file. For example, for the document
		+
		+	<pre>
		+	\font\x=omlgc
		+	\x bl? bla bla bla
		+	</pre>
		+
		+	which contains a Greek letter (in UTF-8), you will get:
		+
		+	<pre>
		+	This is luaTeX, Version 3.141592-snapshot-2007062922 (Web2C 7.5.6)
		+	(
		+	NODE type=whatsit subtype=6
		+	NODE type=hlist subtype=0
		+	NODE type=glyph subtype=0 font=51 char=98
		+	NODE type=glyph subtype=0 font=51 char=108
		+	NODE type=glyph subtype=0 font=51 char=941
		+	NODE type=glue subtype=0
		+	NODE type=glyph subtype=0 font=51 char=98
		+	NODE type=glyph subtype=0 font=51 char=108
		+	NODE type=glyph subtype=0 font=51 char=97
		+	NODE type=glue subtype=0
		+	NODE type=glyph subtype=0 font=51 char=98
		+	NODE type=glyph subtype=0 font=51 char=108
		+	NODE type=glyph subtype=0 font=51 char=97
		+	NODE type=glue subtype=0
		+	NODE type=glyph subtype=0 font=51 char=98
		+	NODE type=glyph subtype=0 font=51 char=108
		+	NODE type=glyph subtype=0 font=51 char=97
		+	NODE type=glue subtype=0
		+	Underfull \hbox (badness 10000) in paragraph at lines 14--15
		+
		+	[1] )
		+	</pre>
		+
		+	Be aware of the fact that the nodes will be created only if the glyph requested indeed exists in the font.
		+
		+	[[User:Yannis.Haralambous\|Yannis.Haralambous]] 02:52, 4 July 2007 (EDT)