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-rw-r--r--doc/luaotfload-main.tex34
1 files changed, 28 insertions, 6 deletions
diff --git a/doc/luaotfload-main.tex b/doc/luaotfload-main.tex
index c418991..92a4c01 100644
--- a/doc/luaotfload-main.tex
+++ b/doc/luaotfload-main.tex
@@ -188,9 +188,30 @@ for a more formal description see figure \ref{font-syntax}.
<specification> ::= <prefixed spec>, [ <subfont no> ], \{ <modifier> \}
\alt <anon lookup>, \{ <modifier> \} ;
- <prefixed spec> ::= `file:', <file lookup>
+ <prefixed spec> ::= `combo:', <combo list>
+ \alt `file:', <file lookup>
\alt `name:', <name lookup> ;
+ <combo list> ::= <combo def 1>, \{ `;', <combo def> \} ;
+
+ <combo def 1> ::= <combo id>, `->', <combo id> ;
+
+ <combo def> ::= <combo id>, `->', <combo id chars> ;
+
+ <combo id> ::= (`(', \{ {\sc digit} \}, `)' | \{ {\sc digit} \} ) ;
+
+ <combo id chars> ::= (`(', \{ {\sc digit} \}, `,', <combo chars>, `)'
+ \alt \{ {\sc digit} \} ) ;
+
+ <combo chars> ::= `fallback'
+ \alt \{ <combo range>, \{ `*', <combo range> \} \} ;
+
+ <combo range> ::= <combo num>, [ `-', <combo num> ] ;
+
+ <combo num> ::= `0x', \{ {\sc hexdigit} \}
+ \alt `U+', \{ {\sc digit} \}
+ \alt \{ {\sc digit} \} ;
+
<file lookup> ::= \{ <name character> \} ;
<name lookup> ::= \{ <name character> \} ;
@@ -227,12 +248,11 @@ requires a \emphasis{prefix}:
\endnarrower
%
where \meta{prefix} is either \inlinecode{file:} or \inlinecode {name:}.\footnote{%
- The development version also knows two further prefixes,
- \inlinecode {kpse:} and \inlinecode {my:}.
+ \identifier{Luaotfload} also knows two further prefixes, \inlinecode {kpse:}
+ and \inlinecode {my:}.
%
A \inlinecode {kpse} lookup is restricted to files that can be found by
- \identifier{kpathsea} and
- will not attempt to locate system fonts.
+ \identifier{kpathsea} and will not attempt to locate system fonts.
%
This behavior can be of value when an extra degree of encapsulation is
needed, for instance when supplying a customized tex distribution.
@@ -373,7 +393,7 @@ have no meaning in \LUATEX.
\beginsubsubsection{Loading by File Name}
-For example, conventional \abbrev{type1} font can be loaded with a
+For example, conventional \TeX\ font can be loaded with a
\inlinecode {file:} request like so:
\beginlisting
@@ -784,6 +804,8 @@ advance as well as a special \emphasis{request syntax}. Furthermore, this
allows to define \emphasis{fallback fonts} to supplement fonts that may lack
certain required glyphs.
+Combinations are created by defining a font using the \luaident{combo:} prefix.
+
\beginsubsection {Fallbacks}
For example, the \identifier{Latin Modern} family of fonts does, as indicated