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encoded using two bytes, and thus lpeg.S will look for one of those two bytes when matching, not the combination of the two. The same is true for lpeg.R, although the latter will display an error message if used with characters above code point 127: I. e. lpeg.R('aä') results in the message bad argument #1 to 'R' (range must have two characters), since to lpeg, ä is two 'characters' (bytes), so aä totals three. • lzlib, by Tiago Dionizio, http://luaforge.net/projects/lzlib/. (version 0.2) • md5, by Roberto Ierusalimschy http://www.inf.puc-rio.br/~roberto/md5/md5-5/md5.html. • luasocket, by Diego Nehab http://w3.impa.br/~diego/software/luasocket/ (version 2.0.2). Note: the .lua support modules from luasocket are also preloaded inside the executable, there are no external file dependencies. 30 Lua general
4 LUATEX LUA Libraries The interfacing between TEX and Lua is facilitated by a set of library modules. The Lua libraries in this chapter are all defined and initialized by the LuaTEX executable. Together, they allow Lua scripts to query and change a number of TEX's internal variables, run various internal TEX functions, and set up LuaTEX's hooks to execute Lua code. The following sections are in alphabetical order. 4.1 The callback library This library has functions that register, find and list callbacks. A quick note on what callbacks are (thanks, Paul!): Callbacks are entry points to LuaTEX's internal operations, which can be interspersed with additional Lua code, and even replaced altogether. In the first case, TEX is simply augmented with new operations (for instance, a manipulation of the nodes resulting from the paragraph builder); in the second case, its hard-coded behavior (for instance, the paragraph builder itself) is ignored and processing relies on user code only. More precisely, the code to be inserted at a given callback is a function (an anonymous function or the name of a function variable); it will receive the arguments associated with the callback, if any, and must frequently return some other arguments for TEX to resume its operations. The first task is registering a callback: id, error = callback.register ( callback_name, func) id, error = callback.register ( callback_name, nil) id, error = callback.register ( callback_name, false) where the callback_name is a predefined callback name, see below. The function returns the internal id of the callback or nil, if the callback could not be registered. In the latter case, error contains an error message, otherwise it is nil. LuaTEX internalizes the callback function in such a way that it does not matter if you redefine a function accidentally. Callback assignments are always global. You can use the special value nil instead of a function for clearing the callback. For some minor speed gain, you can assign the boolean false to the non-file related callbacks, doing so will prevent LuaTEX from executing whatever it would execute by default (when no callback function is registered at all). Be warned: this may cause all sorts of grief unless you know exactly what you are doing! This functionality is present since version 0.38. Currently, callbacks are not dumped into the format file. LuaTEX Lua Libraries 31
Page 1: LuaTEX Reference beta 0.70.1
Page 5 and 6: Contents 1 Introduction 11 2 Basic
Page 7 and 8: 4.1.6 PDF-related callbacks 43 4.1.
Page 9 and 10: 4.9.6.2 Colors 89 4.9.6.3 Transform
Page 11 and 12: 4.13.11.4 tex.definefont 118 4.13.1
Page 13 and 14: 8.1.3.3.5 radical nodes 174 8.1.3.3
Page 15 and 16: 1 Introduction This book will event
Page 17 and 18: 2 Basic TEX enhancements 2.1 Introd
Page 19 and 20: \count \dimen \skip \muskip \marks
Page 21 and 22: \begingroup \endlinechar=10 \direct
Page 23 and 24: 2.7.3 \formatname \formatname's syn
Page 25 and 26: 2.7.9 \suppressifcsnameerror (0.36)
Page 27 and 28: 3 LUA general 3.1 Initialization 3.
Page 29 and 30: Without the --lua option, command l
Page 31 and 32: One level up (a lib directory paral
Page 33: • os.gettimeofday() Returns the c
Page 37 and 38: The asked_name is an otf or tfm fon
Page 39 and 40: env = function ( file_name) Argumen
Page 41 and 42: 4.1.3.2 process_output_buffer (0.43
Page 43 and 44: local_box \localleftbox or \localri
Page 45 and 46: 4.1.4.8 hyphenate function( head,
Page 47 and 48: 4.1.5.5 stop_page_number function()
Page 49 and 50: is requested (e. g., a Dict item by
Page 51 and 52: = :isOK() = :getKind() = :getKind
Page 53 and 54: = :getCropWidth() = :getCropHeight
Page 55 and 56: 4.3 The font library The font libra
Page 57 and 58: font.current( i) This gets or sets
Page 59 and 60: • The font is automatically re-en
Page 61 and 62: For instance: local fields = fontlo
Page 63 and 64: 4.4.5.1.2 Glyph items The glyphs is
Page 65 and 66: key type explanation x number x loc
Page 67 and 68: winascent_add number windescent_add
Page 69 and 70: idontknow preffamilyname prefmodifi
Page 71 and 72: 4.4.5.1.12 sm table key type explan
Page 73 and 74: SubscriptShiftDown SubscriptTopMax
Page 75 and 76: The features points to an array of
Page 77 and 78: A class table is: key type explanat
Page 79 and 80: width number the image width for Lu
Page 81 and 82: appear on the page, or reference it
Page 83 and 84: the name of the file you want to fi
Page 85 and 86:
= kpse.expand_path( s) 4.6.7 expand
Page 87 and 88:
n = lang.preexhyphenchar( l) lang.p
Page 89 and 90:
print_line number line length in ps
Page 91 and 92:
copy_objects function returns a dee
Page 93 and 94:
4.9.6 Subsidiary table formats 4.9.
Page 95 and 96:
Each node has at least the three fi
Page 97 and 98:
This function returns a boolean tha
Page 99 and 100:
The second return value is the badn
Page 101 and 102:
i = node.length( n, m) Returns the
Page 103 and 104:
4.10.1.33 node.unprotect_glyphs nod
Page 105 and 106:
4.11.2 pdf.catalog, pdf.info, pdf.n
Page 107 and 108:
The second mode accepts a single ar
Page 109 and 110:
nest_size nesting stack size param_
Page 111 and 112:
tex.pdfinclusionerrorlevel tex.pdfm
Page 113 and 114:
tex.pagedepth tex.pagefilllstretch
Page 115 and 116:
tex.count.scratchcounter = 0 enormo
Page 117 and 118:
for function-based access. In the f
Page 119 and 120:
The known fields are: key type mode
Page 121 and 122:
This function is basically a shortc
Page 123 and 124:
But if it is, then it will construc
Page 125 and 126:
showtokens splitbotmarks splitdisca
Page 127 and 128:
This helper function is useful duri
Page 129 and 130:
pairs. (only ever unset this if you
Page 131 and 132:
4.16.2 token.is_expandable b = tok
Page 133 and 134:
5 Math The handling of mathematics
Page 135 and 136:
New primitives that are compatible
Page 137 and 138:
\Umathfractiondelsize minimum delim
Page 139 and 140:
\Umathsupbottommin -- SuperscriptBo
Page 141 and 142:
\Umathordordspacing \Umathordopspac
Page 143 and 144:
\Uradical \Uroot The placeme
Page 145 and 146:
• Pre-scripts. • Multi-story st
Page 147 and 148:
6 Languages and characters, fonts a
Page 149 and 150:
Third, the Aleph-derived commands \
Page 151 and 152:
6.4 Applying hyphenation The intern
Page 153 and 154:
with discretionaries in the post-br
Page 155 and 156:
7 Font structure All TEX fonts are
Page 157 and 158:
1 LL 9 TL 2 LB 10 TB 3 LR 11 TR 4 R
Page 159 and 160:
kerns no yes yes table kerning info
Page 161 and 162:
value description real this is a ba
Page 163 and 164:
says that the first referenced font
Page 165 and 166:
} ) end return f end \font\myfont =
Page 167 and 168:
8 Nodes 8.1 LUA node representation
Page 169 and 170:
new_window number data string ref_c
Page 171 and 172:
Note: the new field name head was i
Page 173 and 174:
14 \xspaceskip 15 \parfillskip 16 \
Page 175 and 176:
8.1.3.1 Math kernel subnodes Many o
Page 177 and 178:
7 Close 8 Punct 9 Inner 10 Under 11
Page 179 and 180:
field type explanation subtype numb
Page 181 and 182:
field type explanation attr dir st
Page 183 and 184:
objnum number the referenced pdf ob
Page 185 and 186:
8.1.4.20 late_lua nodes Valid field
Page 187 and 188:
9 Modifications Besides the expecte
Page 189 and 190:
\DefaultInputMode \noDefaultInputMo
Page 191 and 192:
10 Implementation notes 10.1 Primit
Page 193 and 194:
11 Known bugs and limitations, TODO
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