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

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\definefontfeature[coward] [kern=yes,ligatures=yes] \definefontfeature[cowgirl][kern=yes,ligatures=yes,compose=yes] \definefontsynonym [cows] [koeieletters.afm*coward] \definefontsynonym [herd] [koeieletters.afm*cowgirl] \blank[3*medium] \dontleavehmode\hbox{\definedfont[cows sa 5](č)(š)(ž)} \blank[3*medium] \dontleavehmode\hbox{\definedfont[herd sa 5](č)(š)(ž)} \blank[3*medium] \dontleavehmode\hbox{\definedfont[herd sa 5](\v{c})(\v{s})(\v{z})} As expected (at least by me) the rst line has no compose characters. ()()() (č)(š)(ž) (č)(š)(ž) 164 Nice to know
XXI The luacation of TEX and ConTEXt introduction Here I will present the current stage of LuaTEX around beta stage 2, and discuss the impact so far on ConTEXt MkIV that we use as our testbed. I'm writing this at the end of February 2008 as part of the series of regular updates on LuaTEX. As such, this report is part of our more or less standard test document (mk.tex). More technical details can be found in the reference manual that comes with LuaTEX. More information on MkIV is available in the ConTEXt mailing lists, Wiki, and mk.pdf. For those who never heard of LuaTEX: this is a new variant of TEX where several long pending wishes are fullled: • combine the best of all TEX engines • add scripting capabilities • open up the internals to the scripting engine • enhance font support to OpenType • move on to Unicode • integrate MetaPost There are a few more wishes, like converting the code base to C but these are long term goals. The project started a few years ago and is conducted by Taco Hoekwater (Pascal and C coding, code base management, reference manual), Hartmut Henkel (pdf backend, experimental features) and Hans Hagen (general overview, Lua and TEX coding, website). The code development got a boost by a grant of the Oriental TEX project (project lead: Idris Samawi Hamid) and funding via the tug. The related mplib project by the same team is also sponsored by several user groups. The very much needed OpenType fonts are also a user group funded effort: the Latin Modern and TEX Gyre projects (project leads: Jerzy Ludwichowski, Volker RW Schaa and Hans Hagen), with development (the real work) by: Bogusław Jackowski and Janusz Nowacki. One of our leading principles is that we focus on opening up. This means that we don't implement solutions (which also saves us many unpleasant and everlasting discussions). Implementing solutions is up to the user, or more precisely: the macro package writer, and since there are many solutions possible, each can do it his or her way. In that sense we follow the footsteps of Don Knuth: we make an extensible tool, you are free to like it or not, you can take it and extend it where needed, and there is no need to bother us (unless of course you nd bugs or weird side effects). So far this has worked out quite well and we're condent that we can keep our schedule. The luacation of TEX and ConTEXt 165
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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
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letter 105 i spacer 32 letter 116 t
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egister 2 3190 dimen other_char 50
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This example uses an active charact
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function tex.printlist(data) callba
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56 Token speak
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Interesting is that upto now I didn
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do end local function nextbyte(f) r
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\ctxlua{collectgarbage("setstepmul"
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Collecting tokens can take place in
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where TEX has to convert to and fro
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When experimenting with the new imp
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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
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
Page 150 and 151: and this is where MkIV hooks in ist
Page 152 and 153: con-text == [c][o](pre=n-,post=,rep
Page 154 and 155: luastate_bytes min:37009927, max:87
Page 156 and 157: dyn_used min:478158, max:554800, pa
Page 158 and 159: str_ptr min:2131299, max:2136226, p
Page 160 and 161: if_stack min:0, max:13, pages:326 k
Page 162 and 163: pdf_refximage min:0, max:7, pages:3
Page 164 and 165: 162 Collecting garbage
Page 168 and 169: We do our tests of a variant of Con
Page 170 and 171: --make or --ini --run or --fmt= --l
Page 172 and 173: mtxrun --script font --list --patte
Page 174 and 175: Opening up TEX started with rewriti
Page 176 and 177: One can question if a properly work
Page 178 and 179: ound to fonts (instead of being com
Page 180 and 181: • TEX primitives Access to and co
Page 182 and 183: • Open an instance using mplib.ne
Page 184 and 185: is dened in the les whose names sta
Page 186 and 187: }, }, ["pen"]={ { ["left_x"]=2.4548
Page 188 and 189: local tx, ty = p.x_coord, p.y_coord
Page 190 and 191: \startreusableMPgraphic{test} fill
Page 192 and 193: vardef textext(expr str) = image (
Page 194 and 195: local factor = 65536*(7200/7227) fu
Page 196 and 197: end return t This is a typical exam
Page 198 and 199: The user interface is downward comp
Page 200 and 201: key concept. There are few accessib
Page 202 and 203: \directlua 0 { for i=1,10 do tex.pr
Page 204 and 205: } end And still it's not okay, sinc
Page 206 and 207: eason why such code normally is not
Page 208 and 209: Of course we can discuss until eter
Page 210 and 211: some text some more When using Co
Page 212 and 213: and the document itself is processe
Page 214 and 215: 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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The history of luaTEX 2006–2009 / v 0.50 - Pragma ADE

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