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-rw-r--r--Master/texmf-dist/doc/context/sources/general/manuals/luatex/luatex-math.tex30
1 files changed, 29 insertions, 1 deletions
diff --git a/Master/texmf-dist/doc/context/sources/general/manuals/luatex/luatex-math.tex b/Master/texmf-dist/doc/context/sources/general/manuals/luatex/luatex-math.tex
index 4623ce706d7..89c0836ba76 100644
--- a/Master/texmf-dist/doc/context/sources/general/manuals/luatex/luatex-math.tex
+++ b/Master/texmf-dist/doc/context/sources/general/manuals/luatex/luatex-math.tex
@@ -1242,6 +1242,31 @@ $\Uhextensible width 1pt middle 0 "2194$
font metrics are involved we have a different code path for traditional fonts end
\OPENTYPE\ fonts.
+Sometimes you might want to act upon the size of a delimiter, something that is
+not really possible because of the fact that they are calculated {\em after} most
+has been typeset already. In the following example the all|-|zero specification
+is the trigger to make a fake box with the last delimiter dimensions and shift.
+It's an ugly hack but its relative simple and not intrusive implementation has no
+side effects. Any other heuristic solution would not satisfy possible demands
+anyway. Here is a rather low level example:
+
+\startbuffer
+\startformula
+\Uleft \Udelimiter 5 0 "222B
+\frac{\frac{a}{b}}{\frac{c}{d}}
+\Uright \Udelimiter 5 0 "222B
+\kern-2\fontcharwd\textfont0 "222B
+\mathlimop{\Uvextensible \Udelimiter 0 0 0}_1^2 x
+\stopformula
+\stopbuffer
+
+\typebuffer
+
+The last line, by passing zero values, results in a fake operator that has the
+dimensions of the previous delimiter. We can then backtrack over the (presumed)
+width and the two numbers become limit operators. As said, it's not pretty but it
+works.
+
\subsection{Fractions}
\topicindex {math+fractions}
@@ -1306,6 +1331,9 @@ For Latin Modern the result looks as follows:
\stoptabulate
\stop
+The keyword \type {norule} will hide the rule with the above variants while
+keeping the rule related spacing.
+
\subsection {Delimiters: \type{\Uleft}, \prm {Umiddle} and \prm {Uright}}
\topicindex {math+delimiters}
@@ -1454,7 +1482,7 @@ $
$
\stopbuffer
-\typebuffer
+\typebuffer[script]
results in \inlinebuffer[script].