Use Rf_isCharASCII for IS_ASCII instead of testing LEVELS on R >= 4.5 #6422
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Since data.table now depends on R >= 3.3, the backports are no longer needed. Moreover, MAYBE_SHARED is currently a function, while MAYBE_REFERENCED expands to !NO_REFERENCES (which is a function). In debugging output, show MAYBE_REFERENCED (NAMED > 0) instead of NAMED.
getCharCE appeared in R-2.7, making it possible to check for strings _marked_ as UTF-8 or Latin-1. There is no marking as ASCII, so fixing IS_ASCII will have to wait for R >= 4.5.
There's no explicit encoding code for ASCII, so use charIsASCII()
("eapi", expected to appear in R-4.5.0).
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Generated via commit b409a40 Download link for the artifact containing the test results: ↓ atime-results.zip Time taken to finish the standard R installation steps: 11 minutes and 31 seconds Time taken to run |
Don't mind that, we maintainers will take care of it :) |
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set #6420 as the target of this PR to make the chain clearer |
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Good catch! It's a bit worse: LEVELS(x) & 64 returns 0 or 64.
Here are the only users of IS_ASCII:
data.table.h:
#define NEED2UTF8(s) !(IS_ASCII(s) || (s)==NA_STRING || IS_UTF8(s))
fwriteR.c:
#define TO_NATIVE(s) (native && (s)!=NA_STRING && !IS_ASCII(s))
forder.c:
if (!anynotutf8 && /*...*/ !IS_ASCII(s)) {
They all use the result of the macro in boolean context (if / || / &&),
so any non-zero result is interpreted as true.
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This part is split from #6420 (but includes #6420; can rebase if needed) because the R version containing
Rf_isCharASCIIis not currently released. The overall issue is #6180. Not yet sure how to changeNEWS.mdin case we're expectingdata.tablereleases in the meantime.