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-rw-r--r--Master/texmf-dist/tex/context/base/mkiv/syst-lua.mkiv36
1 files changed, 36 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/mkiv/syst-lua.mkiv b/Master/texmf-dist/tex/context/base/mkiv/syst-lua.mkiv
index ca5f9679ff8..3600dac3460 100644
--- a/Master/texmf-dist/tex/context/base/mkiv/syst-lua.mkiv
+++ b/Master/texmf-dist/tex/context/base/mkiv/syst-lua.mkiv
@@ -19,6 +19,42 @@
\def\expdoif #1#2{\clf_doifsame {#1}{#2}}
\def\expdoifnot #1#2{\clf_doifnotsame {#1}{#2}}
+%D Here is variant using a brainwave of the 12\high{+} hour \quotation {Long Road
+%D Out of Eden}\footnote {Eden being Backo\TeX\ 2018, where the virtues of the \type
+%D {\expanded} primitive were mentioned in talks.} trip. For now I don't really see
+%D other useful applications.
+
+\ifdefined\immediateassignment
+
+ \def\expandeddoif#1#2%
+ {\immediateassignment\edef\m_syst_string_one{#1}%
+ \immediateassignment\edef\m_syst_string_two{#2}%
+ \ifx\m_syst_string_one\m_syst_string_two
+ \expandafter\firstofoneargument
+ \else
+ \expandafter\gobbleoneargument
+ \fi}
+
+ \def\expandeddoifnot#1#2%
+ {\immediateassignment\edef\m_syst_string_one{#1}%
+ \immediateassignment\edef\m_syst_string_two{#2}%
+ \ifx\m_syst_string_one\m_syst_string_two
+ \expandafter\gobbleoneargument
+ \else
+ \expandafter\firstofoneargument
+ \fi}
+
+ \def\expandeddoifelse#1#2%
+ {\immediateassignment\edef\m_syst_string_one{#1}%
+ \immediateassignment\edef\m_syst_string_two{#2}%
+ \ifx\m_syst_string_one\m_syst_string_two
+ \expandafter\firstoftwoarguments
+ \else
+ \expandafter\secondoftwoarguments
+ \fi}
+
+\fi
+
% \testfeatureonce{100000}{\doifelse{hello world}{here i am}{}} % 0.3
% \testfeatureonce{100000}{\expandabledoifelse{hello world}{here i am}{}} % 1.5