The history of luaTEX 2006–2009 / v 0.50 - Pragma ADE

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If an acrhive is not a real TEX tree, you can access les anywhere in the tree by using wildcards \input */blabla.tex \input */somepath/blabla.tex These mechanisms evolve over time and it may take a while before they stabelize. For instance, the syntax for the zip inclusion has been adapted more than a year after this chapter was written (which is why this section is added). 18 How Lua ts in
III Initialization revised Initializing LuaTEX in such a way that it does what you want it to do your way can be tricky. This has to do with the fact that if we want to overload certain features (using callbacks) we need to do that before the orginals start doing their work. For instance, if we want to install our own le handling, we must make sure that the built--in le searching does not get initialized. This is particularly important when the built in search engine is based on the kpse library. In that case the rst serious le access will result in loading the ls-R lename databases, which will take an amount of time more or less linear with the size of the TEX trees. Among the reasons why we want to replace kpse are the facts that we want to access zip les, do more specic le searches, use http, ftp and whatever comes around, integrate ConTEXt specic methods, etc. Although modern operating systems will cache les in memory, creating the internal data structures (hashes) from the rather dumb les take some time. On the machine where I was developing the rst experimental LuaTEX code, we're talking about 0.3 seconds for pdfTEX. One would expect a Lua based alternative to be slower, but it is not. This may be due to the different implementation, but for sure the more efcient le cache plays a role as well. So, by completely disabling kpse, we can have more advanced io related features (like reading from zip les) at about the same speed (or even faster). In due time we will also support progname (and format) specic caches, which speeds up loading. In case one wonders why we bother about a mere few hundreds of milliseconds: imagine frequent runs from an editor or sub--runs during a job. In such situation every speed up matters. So, back to initialization: how do we initialize LuaTEX. The method described here is developed for ConTEXt but is not limited to this macro package; when one tells TEXexec to generate formats using the --luatex directive, it will generate the ConTEXt formats as well as mptopdf using this engine. For practical reasons, the Lua based io handler is kpse compliant. This means that the normal texmf.cnf and ls-R les can be used. However, their content is converted in a more Lua friendly way. Although this can be done at runtime, it makes more sense to to this in advance using luatools. The les involved are: input raw input runtime input runtime fallback ls-R files.luc files.lua texmf.lua temxf.cnf configuration.luc configuration.lua In due time luatools will generate the directory listing itself (for this some extra libraries need to be linked in). The conguration le(s) eventually will move to a Lua table format, and when a texmf.lua le is present, that one will be used. Initialization revised 19
Page 1: MKII CONTEXT CONTEXT The history of
Page 4 and 5: XXI The luacation of TEX and ConTEX
Page 6 and 7: 4 Introduction
Page 8 and 9: Keep in mind that the functionality
Page 10 and 11: tricky part of this conversion is t
Page 12 and 13: prologues := 1 ; mpprocset := 1 ; W
Page 14 and 15: code. However, the signicantly larg
Page 16 and 17: \input zip:///somezipfile.zip?name=
Page 18 and 19: ecause we could move all kind of po
Page 22 and 23: luatools --generate This command wi
Page 24 and 25: I know that it sounds a bit messy,
Page 26 and 27: By combining Lua with TEX, we can d
Page 28 and 29: 26 An example: CalcMath
Page 30 and 31: collapser was written. In the (pre)
Page 32 and 33: 30 Going utf
Page 34 and 35: In practice we prefer a more abstra
Page 36 and 37: of making that table accessible for
Page 38 and 39: Therefore, it will be no surprise t
Page 40 and 41: {"special","pdf: 1 0 0 rg"}, {"font
Page 42 and 43: some neat feature of \TeX, once you
Page 44 and 45: OPENTYPE 144 17.571.732 ENC 268 782
Page 46 and 47: The font denition callback intercep
Page 48 and 49: When processing a not so large le b
Page 50 and 51: letter 105 i spacer 32 letter 116 t
Page 52 and 53: egister 2 3190 dimen other_char 50
Page 54 and 55: This example uses an active charact
Page 56 and 57: function tex.printlist(data) callba
Page 58 and 59: 56 Token speak
Page 60 and 61: Interesting is that upto now I didn
Page 62 and 63: do end local function nextbyte(f) r
Page 64 and 65: \ctxlua{collectgarbage("setstepmul"
Page 66 and 67: Collecting tokens can take place in
Page 68 and 69: where TEX has to convert to and fro
Page 70 and 71:
When experimenting with the new imp
Page 72 and 73:
It will be clear that here we colle
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72 Nodes and attributes t={ attr={
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Let's end with an observation. Attr
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end end tex.sprint("\\setbox0=\\hbo
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78 Dirty tricks
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Those who read the previous chapter
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In a similar way support for xml wi
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Undoubtely this will have a huge im
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86 Going beta
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We like testing LuaTEX's open type
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k a el--rie am, ld p n th re, l ak
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his or her font). As said, it also
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["tag"]="calt", } }, ["name"]="ks_l
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When testing the implementation we
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Mr. rmn p Of course we have to test
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ه‎ مَ‏ ه‎ لِ‏ دْ‏
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لاۤئِهٰٖا لاۤئِه
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َ غْتَرِفٌُم عْتَر
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وَْر وةَ،‏ ٰ ي كَ‏
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white black t-green a=1.000 t=0.500
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Palets work with names: \definepale
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• support mechanism are under con
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So, effectively we set a box, and e
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116 Colors redone
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• Spaces at the end of the line (
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兡也包因沘氓侷柵苗
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〉 + 々 = 〉々〉々〉々
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124 Chinese, Japanese and Korean, a
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for k, v in pairs(_G) do print(k, v
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} [4] = 200 I mistakingly assumed t
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130 Optimization
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xetex metapost We can also
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\startluacode xml.sprint(xml.first(
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a[position()=5] maybe a[first()] ma
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Now we have: okay okay okay Repla
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\startxmlsetups xml:mysetups \xmlse
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c1d1 c2d2 d3 d4 d5 Here com
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c2 d3 b/c[1] c1 c2 a/c[1] d3 a/c[-1
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The code in traditional TEX that de
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and this is where MkIV hooks in ist
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con-text == [c][o](pre=n-,post=,rep
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luastate_bytes min:37009927, max:87
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dyn_used min:478158, max:554800, pa
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str_ptr min:2131299, max:2136226, p
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if_stack min:0, max:13, pages:326 k
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pdf_refximage min:0, max:7, pages:3
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162 Collecting garbage
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\definefontfeature[coward] [kern=ye
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We do our tests of a variant of Con
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--make or --ini --run or --fmt= --l
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mtxrun --script font --list --patte
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Opening up TEX started with rewriti
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One can question if a properly work
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ound to fonts (instead of being com
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• TEX primitives Access to and co
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• Open an instance using mplib.ne
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is dened in the les whose names sta
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}, }, ["pen"]={ { ["left_x"]=2.4548
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local tx, ty = p.x_coord, p.y_coord
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\startreusableMPgraphic{test} fill
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vardef textext(expr str) = image (
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local factor = 65536*(7200/7227) fu
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end return t This is a typical exam
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The user interface is downward comp
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key concept. There are few accessib
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\directlua 0 { for i=1,10 do tex.pr
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} end And still it's not okay, sinc
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eason why such code normally is not
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Of course we can discuss until eter
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some text some more When using Co
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and the document itself is processe
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setups and functions are assigned n
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using some kind of api and history
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In LuaTEX with ConTEXt MkIV support
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• Designers (or programmers) may
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228 OpenType: too open?
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cannot be grabbed and they make the
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232 It works!
Page 236 and 237:
when writing the result to le, TEX
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236 Virtual Reality
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\start \textdir TLT one \bidilro tw
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240 Getting lost
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using a few arabic fonts, some chin
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The core data structure that we nee
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table can contain information about
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The ConTEXt cross reference mechani
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of them. Each lookup has a detailed
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otf.replacements otf.sequences otf.
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features: analyze=yes, calt=yes, cc
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feature mark, lookup ml_arab_l_16_s
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للِ‏ ه‎ ِ feature init, lo
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features: analyze=yes, calt=yes, cc
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esult: ۝ 1: [+TRT] U+6DD:۝ [-TRT]
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2: [+TRT] U+F01DD:۝ [-TRT] ۝ The
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Pro. Dr. Donld E. Knuth feature cal
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268 Tracking
Page 272 and 273:
The order in which this happens now
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normalizers characters words fonts
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local function hyphenation(head,tai
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276 The order of things
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of LuaTEX Taco and I worked in para
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Next we see (scaled) Latin Modern:
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As you can see, it is possible to a
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next: U+FF008 { => U+FF06E { => U+F
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end } commands = { { "slot", 1, bas
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(a,b) = (1.20,3.40) So we don't nee
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} description = "SOLIDUS", directio
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⎧ ⎪ ⎪ ⎪ ⎨ ⎪ ⎪ ⎪ ⎩
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840 italic 60 top_accent (0,1020) f
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296 Unicode math
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tex.print("access") else tex.print(
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300 User code
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namespace with code not coming from
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• The code denes a few global tab
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ut this now refers to an index in a
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On the agenda is xing some ‘hyphe
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We also use the opportunity to slow
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Math. Because the TEX Gyre math pro
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Tracing on Taco's machine has shown
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node list callback tasks - 4 unique
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pdftex 1.28 (23) 2.07 (144) 6.96 (2
Page 322 and 323:
July 19, 2009 - The number of files
Page 324 and 325:
July 19, 2009 - The relative number
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The history of luaTEX 2006–2009 / v 0.50 - Pragma ADE

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