Difference between revisions of "Traversing TeX nodes"
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| − | + | == 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) | ||
Revision as of 10:12, 28 December 2010
Traversing TeX nodes
Put this code at the beginning of any TeX file:
\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
)
}
It will display a list of all nodes on the terminal and in the log file. For example, for the document
\font\x=omlgc \x bl? bla bla bla
which contains a Greek letter (in UTF-8), you will get:
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] )
Be aware of the fact that the nodes will be created only if the glyph requested indeed exists in the font.
Yannis.Haralambous 02:52, 4 July 2007 (EDT)
