diff options
Diffstat (limited to 'doc/context/sources/general/manuals/onandon/onandon-execute.tex')
| -rw-r--r-- | doc/context/sources/general/manuals/onandon/onandon-execute.tex | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/doc/context/sources/general/manuals/onandon/onandon-execute.tex b/doc/context/sources/general/manuals/onandon/onandon-execute.tex index abb3b4d8a..bd11dfa73 100644 --- a/doc/context/sources/general/manuals/onandon/onandon-execute.tex +++ b/doc/context/sources/general/manuals/onandon/onandon-execute.tex @@ -134,14 +134,17 @@ which can also be achieved by \directlua{print("Hi there!")} \stoptyping -which sometimes can be more convenient. Anyway, a function call is what we can -use for our purpose as it doesn't involve interpretation and effectively behaves -like a tail call. The following snippet shows what we have in mind: +which sometimes can be more convenient. Don't overestimate the gain in speed +because \type {directlua} is quite efficient too, and on an average run a user +doesn't call it that often (millions of times that is). Anyway, a function call +is what we can use for our purpose as it doesn't involve interpretation and +effectively behaves like a tail call. The following snippet shows what we have in +mind: \startbuffer[code] local stepper = nil local stack = { } -local fid = 0xFFFFFF +local fid = 2 -- make sure to take a frees slot local goback = "\\luafunction" .. fid .. "\\relax" function tex.resume() @@ -166,6 +169,14 @@ function tex.routine(f) stepper = coroutine.create(f) tex.sprint(goback) end + +-- Because we protect against abuse and overload of functions, in ConTeXt we +-- need to do the following: + +if context then + fid = context.functions.register(tex.resume) + goback = "\\luafunction" .. fid .. "\\relax" +end \stopbuffer \ctxluabuffer[code] @@ -238,7 +249,7 @@ course figuring it out took a while): \startbuffer[code] local stepper = nil local stack = { } -local fid = 0xFFFFFF +local fid = 3 -- make sure to take a frees slot local goback = "\\luafunction" .. fid .. "\\relax" function tex.resume() @@ -270,6 +281,13 @@ function tex.routine(f) stepper = coroutine.create(f) tex.sprint(goback) end + +-- Again we need to do it as follows in ConTeXt: + +if context then + fid = context.functions.register(tex.resume) + goback = "\\luafunction" .. fid .. "\\relax" +end \stopbuffer \ctxluabuffer[code] |