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Diffstat (limited to 'doc/context/sources/general/manuals/luatex/luatex-languages.tex')
| -rw-r--r-- | doc/context/sources/general/manuals/luatex/luatex-languages.tex | 62 |
1 files changed, 51 insertions, 11 deletions
diff --git a/doc/context/sources/general/manuals/luatex/luatex-languages.tex b/doc/context/sources/general/manuals/luatex/luatex-languages.tex index f0fc98813..c469c9944 100644 --- a/doc/context/sources/general/manuals/luatex/luatex-languages.tex +++ b/doc/context/sources/general/manuals/luatex/luatex-languages.tex @@ -1,7 +1,6 @@ % language=uk \environment luatex-style -\environment luatex-logos \startcomponent luatex-languages @@ -108,10 +107,10 @@ immediately, not at the end of the current partial paragraph. Typeset boxes now always have their language information embedded in the nodes themselves, so there is no longer a possible dependency on the surrounding -language settings. In \TEX82, a mid-paragraph statement like \type {\unhbox0} would -process the box using the current paragraph language unless there was a -\type {\setlanguage} issued inside the box. In \LUATEX, all language variables are -already frozen. +language settings. In \TEX82, a mid|-|paragraph statement like \type {\unhbox0} +would process the box using the current paragraph language unless there was a +\type {\setlanguage} issued inside the box. In \LUATEX, all language variables +are already frozen. In traditional \TEX\ the process of hyphenation is driven by \type {lccode}s. In \LUATEX\ we made this dependency less strong. There are several strategies @@ -195,6 +194,7 @@ indicate a start or end. You can omit the last set from the test by setting \type {\hyphenationbounds} to a non|-|zero value: \starttabulate[|l|l|] +\DB value \BC behaviour \NC \NR \NC \type{0} \NC not strict \NC \NR \NC \type{1} \NC strict start \NC \NR \NC \type{2} \NC strict end \NC \NR @@ -204,6 +204,7 @@ indicate a start or end. You can omit the last set from the test by setting The word start is determined as follows: \starttabulate[|l|l|] +\DB node \BC behaviour \NC \NR \BC boundary \NC yes when wordboundary \NC \NR \BC hlist \NC when hyphenationbounds 1 or 3 \NC \NR \BC vlist \NC when hyphenationbounds 1 or 3 \NC \NR @@ -219,6 +220,7 @@ The word start is determined as follows: The word end is determined as follows: \starttabulate[|l|l|] +\DB node \BC behaviour \NC \NR \BC boundary \NC yes \NC \NR \BC glyph \NC yes when different language \NC \NR \BC glue \NC yes \NC \NR @@ -487,8 +489,7 @@ The first parameter has the following consequences for automatic discs (the ones resulting from an \type {\exhyphenchar}: \starttabulate[|c|l|l|] -\BC mode \BC automatic disc \type{-} \BC explicit disc \type{\-} \NC \NR -\HL +\DB mode \BC automatic disc \type{-} \BC explicit disc \type{\-} \NC \NR \NC \type{0} \NC \type {\exhyphenpenalty} \NC \type {\exhyphenpenalty} \NC \NR \NC \type{1} \NC \type {\hyphenpenalty} \NC \type {\hyphenpenalty} \NC \NR \NC \type{2} \NC \type {\exhyphenpenalty} \NC \type {\hyphenpenalty} \NC \NR @@ -535,14 +536,14 @@ provided: \stopitem \stopitemize -The expanded argument is first converted back to a space-separated string while +The expanded argument is first converted back to a space|-|separated string while dropping the internal command names. This string is then converted into a dictionary by a routine that creates key|-|value pairs by converting the other listed items. It is important to note that the keys in an exception dictionary can always be generated from the values. Here are a few examples: \starttabulate[|l|l|l|] -\BC value \BC implied key (input) \NC effect \NC\NR +\DB value \BC implied key (input) \BC effect \NC\NR \NC \type {ta-ble} \NC table \NC \type {ta\-ble} ($=$ \type {ta\discretionary{-}{}{}ble}) \NC\NR \NC \type {ba{k-}{}{c}ken} \NC backen \NC \type {ba\discretionary{k-}{}{c}ken} \NC\NR \stoptabulate @@ -574,6 +575,45 @@ hyphenation heavily depended on font encodings. This is no longer true in have \type {hjcode}, the case relate codes can be used exclusively for \type {\uppercase} and \type {\lowercase}. +The three curly brace pair pattern in an exception can be somewhat unexpected so +we will try to explain it by example. The pattern \type {foo{}{}{x}bar} pattern +creates a lookup \type {fooxbar} and the pattern \type {foo{}{}{}bar} creates +\type {foobar}. Then, when a hit happens there is a replacement text (\type {x}) +or none. Because we introduced penalties in discretionary nodes, the exception +syntax now also can take a penalty specification. The value between square brackets +is a multiplier for \type {\exceptionpenalty}. Here we have set it to 10000 so +effectively we get 30000 in the example. + +\def\ShowSample#1#2% + {\startlinecorrection[blank] + \hyphenation{#1}% + \exceptionpenalty=10000 + \bTABLE[foregroundstyle=type] + \bTR + \bTD[align=middle,nx=4] \type{#1} \eTD + \eTR + \bTR + \bTD[align=middle] \type{10em} \eTD + \bTD[align=middle] \type {3em} \eTD + \bTD[align=middle] \type {0em} \eTD + \bTD[align=middle] \type {6em} \eTD + \eTR + \bTR + \bTD[width=10em]\vtop{\hsize 10em 123 #2 123\par}\eTD + \bTD[width=10em]\vtop{\hsize 3em 123 #2 123\par}\eTD + \bTD[width=10em]\vtop{\hsize 0em 123 #2 123\par}\eTD + \bTD[width=10em]\vtop{\setupalign[verytolerant,stretch]\rmtf\hsize 6em 123 #2 #2 #2 #2 123\par}\eTD + \eTR + \eTABLE + \stoplinecorrection} + +\ShowSample{x{a-}{-b}{}x{a-}{-b}{}x{a-}{-b}{}x{a-}{-b}{}xx}{xxxxxx} +\ShowSample{x{a-}{-b}{}x{a-}{-b}{}[3]x{a-}{-b}{}[1]x{a-}{-b}{}xx}{xxxxxx} + +\ShowSample{z{a-}{-b}{z}{a-}{-b}{z}{a-}{-b}{z}{a-}{-b}{z}z}{zzzzzz} +\ShowSample{z{a-}{-b}{z}{a-}{-b}{z}[3]{a-}{-b}{z}[1]{a-}{-b}{z}z}{zzzzzz} + + \section{Applying hyphenation} The internal structures \LUATEX\ uses for the insertion of discretionaries in @@ -735,7 +775,7 @@ the top-level discretionary that resulted from the first hyphenation point. Here is that nested solution again, in a different representation: \starttabulate[|l|c|c|c|c|c|c|] -\NC \BC pre \BC \BC post \BC \BC replace \BC \NC \NR +\DB \BC pre \BC \BC post \BC \BC replace \BC \NC \NR \NC topdisc \NC \type {f-} \NC (1) \NC \NC sub 1 \NC \NC sub 2 \NC \NR \NC sub 1 \NC \type {f-} \NC (2) \NC \type {i} \NC (3) \NC \type {<fi>} \NC (4) \NC \NR \NC sub 2 \NC \type {<ff>-} \NC (5) \NC \type {i} \NC (6) \NC \type {<ffi>} \NC (7) \NC \NR @@ -771,7 +811,7 @@ The mapping of the seven list fields to the six fields in this discretionary nod pair is as follows: \starttabulate[|l|c|c|] -\BC field \BC description \NC \NC \NR +\DB field \BC description \NC \NC \NR \NC \type {disc1.pre} \NC \type {f-} \NC (1) \NC \NR \NC \type {disc1.post} \NC \type {<fi>} \NC (4) \NC \NR \NC \type {disc1.replace} \NC \type {<ffi>} \NC (7) \NC \NR |