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

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72 Nodes and attributes t={ attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, }, }, }, }, width=1742797, depth=3670, height=346817, dir="TLT", list={ id=37, subtype=256, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, }, }, }, }, char=229, font=103, lang=2, left=2, right=3, uchyph=1, next={ id=37, subtype=256, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, }, }, }, }, char=49, font=103, lang=2, left=2, right=3, uchyph=1, next={ id=10, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, }, }, }, }, spec={ id=47, width=100925, stretch=50463, shrink=33642, }, next={ id=37, subtype=256, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, }, }, }, }, char=84, font=103, lang=2, left=2, right=3, uchyph=1, next={ id=11, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, }, }, }, }, kern=-44040, next={ id=37, subtype=256, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, next={ id=46, number=257, value=3, }, }, }, }, }, char=229, font=103, lang=2, left=2, right=3, uchyph=1, next={ id=37, subtype=256, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, next={ id=46, number=257, value=3, }, }, }, }, }, char=50, font=103, lang=2, left=2, right=3, uchyph=1, next={ id=10, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, next={ id=46, number=257, value=3, }, }, }, }, }, spec={ id=47, width=100925, stretch=50463, shrink=33642, }, next={ id=37, subtype=256, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, next={ id=46, number=257, value=3, }, }, }, }, }, char=69, font=103, lang=2, left=2, right=3, uchyph=1, next={ id=37, subtype=256, attr={ id=48, next={ id=46, next={ id=46, number=137, value=3, next={ id=46, number=138, value=1, }, }, }, }, char=88, font=103, lang=2, left=2, right=3, uchyph=1, }, }, }, }, }, }, }, }, }, }, } Figure IX.1 \hbox {\aa 1 T{\ab 3\aa 2 E}X}
if has_attribute(n,200) then total = total + 1 end n = n.next end texio.write_nl(string.format( "attribute 200 has been seen % times", total )) When implementing nodes and attributes we did rather extensive tests and one of the test documents implemented some preliminary color mechanism based on attributes. When handling the colors the previous function was called some 300.000 times and the total node processing time (which also involved font handling) was some 2.9 seconds. Implementing this function as a helper brought down node processing time to 2.4 seconds. Of course the gain depends on the complexity of the list (nesting) and the number of attributes that are set (upto 5 per node in this test). A few more helper functions are available, some are for convenience, some gain us some speed. The nice thing about attributes is that they obey grouping. This means that in the following sequence: x {\aa1 x \ab2 x} x the attributes are assigned like: x x(201=1) x(201=1,202=2) x Internally LuaTEX does some optimizations with respect to assigning a sequence of similar attributes, but you should keep in mind that in practice the memory usage will be larger when using many attributes. We played with color and other properties, hyphenation based on word lists (and tracking languages with attributes) and or special algorithms (url hyphenation), spell checking (marking words as being spelled wrongly), and a few more things. This involved handling attributes in several callbacks resulting in the insertion or deletion of nodes. When using attributes for color support, we have to insert pdfliteral whatsit nodes at some point depending on the current color. This also means that the time spent with color support at the TEX end will be compensated by time spent at the Lua side. It also means that because housekeeping to do with colors spanning pages and columns is gone because from now on color information travels with the nodes. This saves quite some ugly code. Because most of the things that we want to do with attributes (and we have quite an agenda) are already nicely isolated in ConTEXt, attributes will nd their way rather soon in ConTEXt MkIV. Nodes and attributes 73
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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
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
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 100 and 101: Mr. rmn p Of course we have to test
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
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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!
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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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