Thomas A. Schmitz schrieb am 06.01.19 um 18:53:
Hi everybody,
best wishes for (the still new) 2019! My question is not strictly a
ConTeXt problem, but about the way luatex (and pure Lua) can handle utf8
in lpeg. Here is my Lua example:
mystring = "abcdeφὴὰabcde"
local replace_table = {
a = "y",
c = "z",
ὴ = "ή",
ὰ = "ά",
}
function replace(s)
local patt = (lpeg.Cs(1)) / replace_table
local parser = lpeg.Cs((patt + 1)^0)
t = parser:match(s)
return t
end
newstring = replace(mystring)
print(newstring)
This will successfully replace "a" and "c," but not "ὴ" or "ὰ" because
lpeg.Cs(1) sees only the first byte of these multibyte characters. Pure
Lua complains with an error message; luatex runs, but does not do the
replacement. What would be a good way to work around this limitation?
Below is a modified version of the example on page 103 of the ConTeXt
Lua Documents (cld-mkiv.pdf) manual.
\starttext
\startluacode
print("abcdeφὴὰabcde")
local remap = utf.remapper { a = "y", c = "z", ὴ = "ή", ὰ = "ά" }
print(remap("abcdeφὴὰabcde"))
\stopluacode
\stoptext
Wolfgang
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