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

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Mr. rmn p Of course we have to test another famous name: D Do Don Dona Donal Donald K Kn Knu Knut Knuth \par Don Knuth Donald Knuth Donald E. Knuth DEK \par Prof. Dr. Donald E. Knuth \par D Do D a Dn onl Kn nuth Dn ald old E. nuth EK o. Dr. old E. nuth Unfortunately the Lua and TEX logos don't come out that well: L Lu Lua l lu lua t te tex TeX luatex luaTeX LuaTeX L L a l a tx X ux luTX aTeX This font has quite some ornaments and there is an ornm feature that can be applied. We're still not sure about its usage, but when one keys in text in lowercase, hermann comes out as follows: As said in the beginning, dirty implementation details will be kept away from the reader. Also, you should not be surprised if the current code had some bugs or does some things wrong. Also, if spacing looks a bit weird to you, keep in mind that we're still in the middle of sorting things out. Ta ewer & agn 98 Zapng fonts
ٖ ٌ َ هّٰ‏ ِ انَِ‏ سِ‏ لِ‏ هِ‏ دْ‏ ارَِ‏ حِ‏ تْ‏ هِ‏ دْ‏ مَ‏ حِ‏ تْ‏ دْ‏ مَ‏ هّٰ‏ لِ‏ دْ‏ مَ‏ حْ‏ ٖ ِ ٌ َ ‏ّهٰ‏ قَ‏ لَ‏ يِ‏ ذَّ‏ هِ‏ هِ‏ دْ‏ لَ‏ يِ‏ اشِرَ‏ هِ‏ الَ‏ انَِ‏ رْ‏ اَ‏ ‏ّنَ‏ رَّ‏ يْ‏ َ َ َ انَ.َ‏ رْ‏ كِّ‏ امَ‏ سْ‏ رَ‏ كُّ‏ رَّ‏ َّ XIII Arabic Let's start with admitting that I don't speak or read Arabic, and the sample texts used here are part of what we use in the Oriental TEX project for exploring advanced Arabic typesetting. This chapter will not discuss arab typesetting in much detail, but should be seen as complementing the ‘Onthology on Arabic Typesetting’ written by Idris. Here I will only show what the consequences are of applying features. Because we see glyphs but often still deal with characters when analyzing what to do, we will use these terms mixed. The font that we use here is the ‘arabtype’ font by MicroSoft. This font covers Latin scripts and Arabic and has a rich set of features. It's also a rather big font, so it is a nice torture test for LuaTEX. First we show what MkIV does with a sequence of characters when no features are enabled by the user. We have turn on color tracing. This gives us some feedback about the how the analyze worked out. Analyzing for Arabic boils down to marking the initial, mid, nal and isolated forms. We don't need to explicitly enable analyzing, it's on by default. The mode ag is set to node because we cannot use TEX's default mechanism. When LuaTEX and MkIV are beyond beta stage, we will use that mode by default. analyze=yes, features=yes, language=dflt, mode=node, script=arab لِل ،ٖ الَ‏ وَالنِّسْيَانَ.َوالنَّفْعَ‏ وَالضَّرَّ،‏ وَالسُّكُوْنَ‏ وَالْحَرَكَةَ،‏ وَالْأَرْوَاحَ‏ وَالْأَجْسَامَ،‏ وَالذِّكْرَ‏ وَلِحُسْنَِشاكِرًا،‏ معُ‏ حِ‏ لُ‏ نَاشِرًا؛ٰالاۤئِهٖ‏ رَ‏ فِ‏ بٍ‏ الَ‏ ‏ْحَمْد لُ‏ ‏ِل ‏ْد مُعتْ‏ ‏َرِف بٍ‏ شاكَ‏ ‏ِرًا،‏ وَلِحُسْنِ‏ اٰلائۤ‏ نٖ‏ والنَّفْعَ‏ ‏َالض و،‏ ‏َالس الَ‏ مغُ‏ خْ‏ ‏ِح ‏َمدْ‏ مُغتْ‏ ‏ًا؛ اَلّذَ‏ خْ‏ ‏ُونْ‏ وَ‏ ‏َالحْ‏ ‏َكَةَ‏ رَ‏ فِ‏ منِ‏ بْ‏ مجَ‏ ب،‏ الثَّنَاۤءِ‏ الْمَوْتَ‏ وَالْحَيٰوةَ،‏ وَالْخَيْرَ‏ وَالشَّرَّ،‏ ‏َرفِ‏ مِن بْ‏ ‏ِحَار مجَ‏ ‏َق الْمَوْت ‏َالْحَيٰوةَ‏ و،‏ ‏َالْأرَ‏ ‏ْوَاح ‏َالْأجَ‏ و،‏ ب،‏ و،‏ ‏ِلسِ‏ ‏ْخيَ‏ ‏َالذ الث ‏ۤءِ‏ ‏َالش ‏َالنّسِ‏ َ و ،َّ َ و َ و َ و ِ حمَ‏ ،ٖ َ و Once these forms are identied, the init, medi, fina and isol features can be applied since they need this information. As you can see, different shapes show up. The vowels (marks in OpenType speak) are not affected. It may not be entirely clear here, but these vowels don't have width. Arabic 99
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MKII CONTEXT CONTEXT The history of
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XXI The luacation of TEX and ConTEX
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4 Introduction
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Keep in mind that the functionality
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tricky part of this conversion is t
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prologues := 1 ; mpprocset := 1 ; W
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code. However, the signicantly larg
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\input zip:///somezipfile.zip?name=
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ecause we could move all kind of po
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If an acrhive is not a real TEX tre
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luatools --generate This command wi
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I know that it sounds a bit messy,
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By combining Lua with TEX, we can d
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26 An example: CalcMath
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collapser was written. In the (pre)
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30 Going utf
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In practice we prefer a more abstra
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of making that table accessible for
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Therefore, it will be no surprise t
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{"special","pdf: 1 0 0 rg"}, {"font
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some neat feature of \TeX, once you
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OPENTYPE 144 17.571.732 ENC 268 782
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The font denition callback intercep
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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
Page 74 and 75: 72 Nodes and attributes t={ attr={
Page 76 and 77: Let's end with an observation. Attr
Page 78 and 79: end end tex.sprint("\\setbox0=\\hbo
Page 80 and 81: 78 Dirty tricks
Page 82 and 83: Those who read the previous chapter
Page 84 and 85: In a similar way support for xml wi
Page 86 and 87: Undoubtely this will have a huge im
Page 88 and 89: 86 Going beta
Page 90 and 91: We like testing LuaTEX's open type
Page 92 and 93: k a el--rie am, ld p n th re, l ak
Page 94 and 95: his or her font). As said, it also
Page 96 and 97: ["tag"]="calt", } }, ["name"]="ks_l
Page 98 and 99: When testing the implementation we
Page 102 and 103: ه‎ مَ‏ ه‎ لِ‏ دْ‏
Page 104 and 105: لاۤئِهٰٖا لاۤئِه
Page 106 and 107: َ غْتَرِفٌُم عْتَر
Page 108 and 109: وَْر وةَ،‏ ٰ ي كَ‏
Page 110 and 111: white black t-green a=1.000 t=0.500
Page 112 and 113: Palets work with names: \definepale
Page 114 and 115: • support mechanism are under con
Page 116 and 117: So, effectively we set a box, and e
Page 118 and 119: 116 Colors redone
Page 120 and 121: • Spaces at the end of the line (
Page 122 and 123: 兡也包因沘氓侷柵苗
Page 124 and 125: 〉 + 々 = 〉々〉々〉々
Page 126 and 127: 124 Chinese, Japanese and Korean, a
Page 128 and 129: for k, v in pairs(_G) do print(k, v
Page 130 and 131: } [4] = 200 I mistakingly assumed t
Page 132 and 133: 130 Optimization
Page 134 and 135: xetex metapost We can also
Page 136 and 137: \startluacode xml.sprint(xml.first(
Page 138 and 139: a[position()=5] maybe a[first()] ma
Page 140 and 141: Now we have: okay okay okay Repla
Page 142 and 143: \startxmlsetups xml:mysetups \xmlse
Page 144 and 145: c1d1 c2d2 d3 d4 d5 Here com
Page 146 and 147: c2 d3 b/c[1] c1 c2 a/c[1] d3 a/c[-1
Page 148 and 149: 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!
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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
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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
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July 19, 2009 - The number of files
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July 19, 2009 - The relative number
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