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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \langlist {Initialization of hypenation patterns <2020-03-10>} % preloaded in format
\_doc -----------------------------
The <iso-code> means a shortcut of language name (mostly by ISO 639-1).
The following control sequences are used for language switching:
\begitems
* `\_lan:<number>` expands to `<iso-code>` of the language.
The number is internal number of languages used as a value of
`\language` register.
* `\_ulan:<long-lang>` expands to `<iso-code>` too. This is transformation
from long name of language (lowercase letters) to <iso-code>.
* `\_<iso-code>Patt` (for example `\_csPatt`) is the language `<number>` declared by `\chardef`.
* `\<iso-code>lang`
(for example \`\enlang`, \`\cslang`, \`\sklang`, \`\delang`, \`\pllang`)
is language selector. It exists in two states
\begitems
* Initialization state: when `\<iso-code>lang` is used first then it
must load the patterns into memory using Lua code. If it is done then
the `\<iso-code>lang` re-defines itself to processing state.
* Processing state: it only sets `\language=\_<iso-code>Patt`, i.e it
selects the hyphenation patterns. It does a little more
language-dependent work, as mentioned below.
\enditems
* `\_langspecific:<isocode>` is processed by `\<iso-code>lang` and it
should include language-specific macros declared by user or macro designer.
\enditems
The USenglish patters are preloaded first:
\_cod -----------------------------
\_chardef\_enPatt=0
\_def\_pattlist{\_enPatt=0}
\_def\_langlist{en(USenglish)}
\_sdef{_lan:0}{en}
\_sdef{_ulan:usenglish}{en}
\_def\_enlang{\_uselang{en}\_enPatt23} % \lefthyph=2 \righthyph=3
\_def\enlang{\_enlang}
\_sdef{_langspecific:en}{\_nonfrenchspacing}
\_lefthyphenmin=2 \_righthyphenmin=3 % disallow x- or -xx breaks
\_input hyphen % en(USenglish) patterns from TeX82
\_doc -----------------------------
\`\_preplang` `<iso-code> <long-lang> <hyph-file-spec> <number> <pre-hyph><post-hyph>`
prepares the\nl `\<iso-code>lang` to its initialization state. Roughly
speaking, it does:
\begtt \catcode`\<=13
\chardef\_<iso-code>Patt = <number>
\def\_lan:<number> {<iso-code>}
\def\_ulan:<long-lang> {<iso-code>}
\def\_<iso-code>lang {%
\_loadpattrs <hyph-file-spec> <number> <long-lang> % loads patterns using Lua code
\gdef\_<iso-code>lang {\_uselang{<iso-code>}\_<iso-code>Patt <pre-hyph><post-hyph>}
\_<iso-code>lang % runs itself in processing state
}
\def\<iso-code>lang {\_<iso-code>lang} % public version \<iso-code>lang
\endtt
You can see that `\<iso-code>lang` runs \^`\_loadpattrs` and
\^`\_uselang` first (in initialization state) and it runs
only \^`\_uselang` when it is called again (in processing state).
\_cod -----------------------------
\_def\_preplang #1 #2 #3 #4 #5 {%
\_ea\_chardef \_csname _#1Patt\_endcsname=#4
\_sdef{_lan:#4}{#1}\_lowercase{\_sdef{_ulan:#2}}{#1}%
\_def\_next{\_ea\_noexpand\_csname _#1lang\_endcsname}%
\_ea\_edef \_csname _#1lang\_endcsname {%
\_noexpand\_loadpattrs #3 #4 #2 % loads patterns
\_gdef\_next{\_noexpand\_uselang{#1}\_csname _#1Patt\_endcsname #5}% re-defines itself
\_next % runs itself in processing state
}
\_addto\_langlist{ #1(#2)}%
\_sdef{#1lang\_ea}\_ea{\_csname _#1lang\_endcsname}% unprefixed \<isocode>lang
}
\_doc -----------------------------
\`\_loadpattrs` `<hyph-file-spec> <number> <long-lang>`
loads hyphenation patterns and hyphenation exceptions for given language
and registers them as `\language=<number>`.
The <hyph-file-spec> is a part of full file name wich is read:
`hyph-<hyph-file-spec>.tex`. The patterns and hyphenation exceptions
are saved here in UTF-8 encoding.
The <hyph-file-spec> should be a list of individual <hyph-file-spec>'s
separated by comma, see the language Serbian below for example.
\_cod -----------------------------
\_def\_loadpattrs#1 #2 #3 {%
\_wlog{Loading hyphenation #3: (#1) \_string\language=#2}%
\_begingroup\_setbox0=\_vbox{% we don't want spaces in horizontal mode
\_language=#2\_def\\{#3}%
\_let\patterns=\_patterns \_let\hyphenation=\_hyphenation \_def\message##1{}%
\_loadpattrsA #1,,%
}\_endgroup
}
\_def\_loadpattrsA #1,{\_ifx,#1,\_else
\_isfile {hyph-#1}\_iftrue \_opinput{hyph-#1}%
\_else \_opwarning{Hyph. patterns #1 for \\ not loaded, probably missing package}%
\_def\_opwarning##1{}\_fi
\_ea \_loadpattrsA \_fi
}
\_doc -----------------------------
\`\_uselang``{<iso-code>}\_<iso-code>Patt <pre-hyph><post-hyph>`\nl
sets `\language`, `\lefthyphenmin`, `\righthyphenmin` and runs
`\frenchspacing`. This default language-dependent settings
should be re-declared by `\_langspecific:<iso-code>` which is run
finally (it is `\relax` by default, only `\_langspecific:en` runs
\^`\nonfrenchspacing`).
\_cod -----------------------------
\_def\_uselang#1#2#3#4{\_language=#2\_lefthyphenmin=#3\_righthyphenmin=#4\_relax
\_frenchspacing % \nonfrenchspacing can be set in \cs{_langspecific:lan}
\_cs{_langspecific:#1}%
}
\_doc -----------------------------
The \`\uselanguage` `{<long-lang>}` is defined here
(for compatibility with e-plain users).
\_cod -----------------------------
\_def\_uselanguage#1{\_lowercase{\_cs{_\_cs{_ulan:#1}lang}}}
\_public \uselanguage ;
\_doc -----------------------------
The numbers for languages are declared as fixed constants (no
auto-generated). This concept is inspired from CSplain.
There are typical numbers of languages in CSplain: 5=Czech in IL2,
15=Czech in T1 and 115=Czech in Unicode. We keep these constants
but we load only Unicode patterns (greater than 100), of course.
\_cod -----------------------------
\_preplang enus USenglishmax en-us 100 23
\_preplang engb UKenglish en-gb 101 23
\_preplang it Italian it 102 22
\_preplang ia Interlingua ia 103 22
\_preplang id Indonesian id 104 22
\_preplang cs Czech cs 115 23
\_preplang sk Slovak sk 116 23
\_preplang de nGerman de-1996 121 22
\_preplang fr French fr 122 22
\_preplang pl Polish pl 123 22
\_preplang cy Welsh cy 124 23
\_preplang da Danish da 125 22
\_preplang es Spanish es 126 22
\_preplang sl Slovenian sl 128 22
\_preplang fi Finnish fi 129 22
\_preplang hu Hungarian hu 130 22
\_preplang tr Turkish tr 131 22
\_preplang et Estonian et 132 23
\_preplang eu Basque eu 133 22
\_preplang ga Irish ga 134 23
\_preplang nb Bokmal nb 135 22
\_preplang nn Nynorsk nn 136 22
\_preplang nl Dutch nl 137 22
\_preplang pt Portuguese pt 138 23
\_preplang ro Romanian ro 139 22
\_preplang hr Croatian hr 140 22
\_preplang zh Pinyin zh-latn-pinyin 141 11
\_preplang is Icelandic is 142 22
\_preplang hsb Uppersorbian hsb 143 22
\_preplang af Afrikaans af 144 12
\_preplang gl Galician gl 145 22
\_preplang kmr Kurmanji kmr 146 22
\_preplang tk Turkmen tk 147 22
\_preplang la Latin la 148 22
\_preplang lac classicLatin la-x-classic 149 22
\_preplang lal liturgicalLatin la-x-liturgic 150 22
\_preplang elm monoGreek el-monoton 201 11
\_preplang elp Greek el-polyton 202 11
\_preplang grc ancientGreek grc 203 11
\_preplang ca Catalan ca 204 22
\_preplang cop Coptic cop 205 11
\_preplang mn Mongolian mn-cyrl 206 22
\_preplang sa Sanskrit sa 207 13
\_preplang ru Russian ru 208 22
\_preplang uk Ukrainian uk 209 22
\_preplang hy Armenian hy 210 12
\_preplang as Assamese as 211 11
\_preplang hi Hindi hi 212 11
\_preplang kn Kannada kn 213 11
\_preplang lv Latvian lv 215 22
\_preplang lt Lithuanian lt 216 22
\_preplang ml Malayalam ml 217 11
\_preplang mr Marathi mr 218 11
\_preplang or Oriya or 219 11
\_preplang pa Panjabi pa 220 11
\_preplang ta Tamil ta 221 11
\_preplang te Telugu te 222 11
\_preplang be Belarusian be 223 22
\_preplang bg Bulgarian bg 224 22
\_preplang bn Bengali bn 225 11
\_preplang cu churchslavonic cu 226 12
\_preplang deo oldGerman de-1901 227 22
\_preplang gsw swissGerman de-ch-1901 228 22
\_preplang eo Esperanto eo 229 22
\_preplang fur Friulan fur 230 22
\_preplang gu Gujarati gu 231 11
\_preplang ka Georgian ka 232 12
\_preplang mk Macedonian mk 233 22
\_preplang oc Occitan oc 234 22
\_preplang pi Pali pi 235 12
\_preplang pms Piedmontese pms 236 22
\_preplang rm Romansh rm 237 22
\_preplang sr Serbian sh-cyrl,sh-latn 238 22
\_preplang sv Swedish sv 239 22
\_preplang th Thai th 240 23
\_preplang ethi Ethiopic mul-ethi 241 11
\_doc -----------------------------
The \`\langlist` includes names of all languages which are ready to load
and use their hyphenation patterns. This list is printed to terminal and
to log at ini\TeX/ state here. It can be used when processing document too.
\_cod -----------------------------
\_message{Language hyph.patterns ready to load: \_langlist.
Use \_string\<shortname>lang to initialize language,
\_string\cslang\_space for example}
\_public \langlist ;
\_endcode % ---------------------------------------------
Maybe, you need to do more language specific actions than just switching
hyphenation patterns. For example you need to load a specific font with a
specific script used in selected language, you can define a macros for
quotation marks depending on the language etc.
The example shows how to declare such language specific things.
\begtt
\def\langset #1 #2{\sdef{_langspecific:#1}{#2}}
\langset fr {... declare French quotation marks}
\langset de {... declare German quotation marks}
\langset gr {... switch to Greek fonts family}
... etc.
\endtt
Note that you need not to set language specific phrases (like `\today`)
by this code. Another concept is used for such tasks. See the
section~\ref[langphrases] for more details.
|
