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

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By combining Lua with TEX, we can do the conversion from calculator math to TEX immediately, without auxiliary programs or complex parsing using TEX macros. tex In a ConTEXt source one can use the \calcmath command, as in: The strange formula \calcmath {sqrt(sin^2(x)+cos^2(x))} boils down to ... One needs to load the module rst, using: \usemodule[calcmath] Because the amount of code involved is rather small, eventually we may decide to add this support to the MkIV kernel. xml Coding math in TEX is rather efcient. In xml one needs way more code. Presentation MathML provides a few basic constructs and boils down to combining those building blocks. Content MathML is better, especially from the perspective of applications that need to do interpret the formulas. It permits for instance the ConTEXt content MathML handler to adapt the rendering to cultural driven needs. The OpenMath way of coding is like content MathML, but more verbose with less tags. Calculator math is more restrictive than TEX math and less verbose than any of the xml variants. It looks like: sqrt(sin^2(x)+cos^2(x)) test And in display mode: sqrt(sin^2(x)+cos^2(x)) test speed This script (which you can nd in the ConTEXt distribution as soon as the MkIV code variants are added) is the rst real TEX related Lua code that I wrote; so far I had only written some wrapping and spell checking code for the SciTE editor. It also made a nice demo for a couple of talks that I held at usergroup meetings. The script has a lot of expressions. These convert one string into another. They are less powerful than regular expressions, but pretty fast and adequate. The feature I miss most is alternation like (l|st)uck but it's a small price to pay. As the Lua manual explains: adding a posix compliant regexp parser would take more lines of code than Lua currently does. 24 An example: CalcMath
On my machine, running this rst version took 3.5 seconds for 2500 times typesetting the previously shown square root of sine and cosine. Of this, 2.1 seconds were spent on typesetting and 1.4 seconds on converting. After optimizing the code, 0.8 seconds were used for conversion. A stand alone Lua takes .65 seconds, which includes loading the interpreter. On a test of 25.000 sample conversions, we could gain some 20% conversion time using the LuaJIT just in time compiler. An example: CalcMath 25
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 24 and 25: I know that it sounds a bit messy,
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 74 and 75: 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
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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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