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

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function tex.printlist(data) callback.register('token_filter', function () callback.register('token_filter', nil) return data end) end Another example of usage is: callback.register('token_filter', function () local t = token.get_next local cmd, chr, id = t[1], t[2], t[3] -- do something with cmd, chr, id return { cmd, chr, id } end) There is a whole repertoire of related functions, one is token.create, which can be used as: tex.printlist{ token.create("hbox"), token.create(utf.byte("{"), 1), token.create(utf.byte("?"), 12), token.create(utf.byte("}"), 2), } This results in: ? While playing with this we made a few auxiliary functions which permit things like: tex.printlist ( table.unnest ( { tokens.hbox, tokens.bgroup, tokens.letters("12345"), tokens.egroup, } ) ) Unnesting is needed because the result of the letters call is a table, and the printlist function wants a attened table. The result looks like: 12345 cmd chr id name make_box 131 1568 hbox left_brace 123 54 Token speak
letter 49 1 letter 50 2 letter 51 3 letter 52 4 letter 53 5 right_brace 125 In practice, manipulating tokens or constructing lists of tokens this way is rather cumbersome, but at least we now have some kind of access, if only for illustrative purposes. \hbox{12345\hbox{54321}} can also be done by saying: tex.sprint("\\hbox{12345\\hbox{54321}}") or under ConTEXt's basic catcode regime: tex.sprint(tex.ctxcatcodes, "\\hbox{12345\\hbox{54321}}") If you like it the hard way: tex.printlist ( table.unnest ( { tokens.hbox, tokens.bgroup, tokens.letters("12345"), tokens.hbox, tokens.bgroup, tokens.letters(string.reverse("12345")), tokens.egroup, tokens.egroup } ) ) This method may attract those who dislike the traditional TEX syntax for doing the same thing. Okay, a carefull reader will notice that reversing the string in TEX takes a bit more trickery, so . . . Token speak 55
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MKII CONTEXT CONTEXT The history of
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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 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 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 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
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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!
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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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