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

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I know that it sounds a bit messy, but till we have a more clear picture of where LuaTEX is heading this is the way to proceed. The average ConTEXt user won't notice those details, because TEXexec will take care of things. Currently we follow the tds and web2c conventions, but in the future we may follow different or additional approaches. This may as well be driven by more complex io models. For the moment extensions still t in. For instance, in order to support access to remote resources and related caching, we have added to the conguration le the variable: TEXMFCACHE = $TMP;$TEMP;$TMPDIR;$HOME;$TEXMFVAR;$VARTEXMF;. 22 Initialization revised
IV An example: CalcMath introduction For a long time TEX's way of coding math has dominated the typesetting world. However, this kind of coding is not that well suited for non academics, like schoolkids. Often kids do know how to key in math because they use advanced calculators. So, when a couple of years ago we were implementing a workow where kids could ll in their math workbooks (with exercises) on--line, it made sense to support so called Texas Instruments math input. Because we had to parse the form data anyway, we could use a [[ and ]] as math delimiters instead of $. The conversion too place right after the form was received by the web server. sin(x) + x^2 + x^(1+x) + 1/x^2 sin(x) + x 2 + x 1+x + 1 x 2 mean(x+mean(y)) x + y ∫ int(a,b,c) a b c (1+x)/(1+x) + (1+x)/(1+(1+x)/(1+x)) 1+x 1+x + 1+x 1+ 1+x 1+x 10E-2 10 × 10 −2 (1+x)/x 1+x x (1+x)/12 1+x 12 (1+x)/-12 1+x −12 1/-12 1 −12 12x/(1+x) exp(x+exp(x+1)) abs(x+abs(x+1)) + pi + inf Dx Dy D(x+D(y)) Df(x) g(x) sqrt(sin^2(x)+cos^2(x)) 12x 1+x e x+ex+1 |x + |x + 1|| + π + inf dx dy dx dx d dx (x + d dx (y)) f ′ (x) g(x) √ sin 2 (x) + cos 2 (x) An example: CalcMath 23
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 20 and 21: If an acrhive is not a real TEX tre
Page 22 and 23: luatools --generate This command wi
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
Page 84 and 85:
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
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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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