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this is added for completeness' sake since all the other possible
`builtins.typeOf` results have a corresponding `builtins.is<Type>`
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A partner of builtins.getContext, useful for the same reasons.
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This can be very helpful when debugging, as well as enabling complex
black magic like surgically removing a single dependency from a
string's context.
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Fixes #2361.
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This is primarily useful for processing Cargo.lock files.
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Fixes #1374.
Closes #2129.
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Nix prints the floating point number 4.0 as "4".
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git://github.com/ryantrinkle/nix
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Currently e.g. `builtins.unsafeGetAttrPos "abort" builtins` will
eventually segfault because pos->file is an unset Symbol.
Found by afl-fuzz.
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Flex's regexes have an annoying feature: the dot matches everything
except a newline. This causes problems for expressions like:
"${0}\
"
where the backslash-newline combination matches this rule instead of the
intended one mentioned in the comment:
<STRING>\$|\\|\$\\ {
/* This can only occur when we reach EOF, otherwise the above
(...|\$[^\{\"\\]|\\.|\$\\.)+ would have triggered.
This is technically invalid, but we leave the problem to the
parser who fails with exact location. */
return STR;
}
However, the parser actually accepts the resulting token sequence
('"' DOLLAR_CURLY 0 '}' STR '"'), which is a problem because the lexer
rule didn't assign anything to yylval. Ultimately this leads to a crash
when dereferencing a NULL pointer in ExprConcatStrings::bindVars().
The fix does change the syntax of the language in some corner cases
but I think it's only turning previously invalid (or crashing) syntax
to valid syntax. E.g.
"a\
b"
and
''a''\
b''
were previously syntax errors but now both result in "a\nb".
Found by afl-fuzz.
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Otherwise, running e.g.
nix-instantiate --eval -E --strict 'builtins.replaceStrings [""] ["X"] "abc"'
would just hang in an infinite loop.
Found by afl-fuzz.
First attempt of this was reverted in e2d71bd1862cdda because it caused
another infinite loop, which is fixed now and a test added.
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This reverts commit 4ea9707591beceacf9988b3c185faf50da238403.
It causes an infinite loop in Nixpkgs evaluation,
e.g. "nix-instantiate -A hello" hung.
PR #1886.
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Otherwise, running e.g.
nix-instantiate --eval -E --strict 'builtins.replaceStrings [""] ["X"] "abc"'
would just hang in an infinite loop.
Found by afl-fuzz.
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Fixes #1868.
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builtins.path allows specifying the name of a path (which makes paths
with store-illegal names now addable), allows adding paths with flat
instead of recursive hashes, allows specifying a filter (so is a
generalization of filterSource), and allows specifying an expected
hash (enabling safe path adding in pure mode).
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This reverts commit f90f660b243866b8860eeb24cc4a345d32cc7ce7.
This broke Hydra's release.nix, which contained
preCheck = ''export LOGNAME=${LOGNAME:-foo}'';
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URIs now have to contain "://" or start with "channel:".
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The function 'builtins.split' takes a POSIX extended regular expression
and an arbitrary string. It returns a list of non-matching substring
interleaved by lists of matched groups of the regular expression.
```nix
with builtins;
assert split "(a)b" "abc" == [ "" [ "a" ] "c" ];
assert split "([ac])" "abc" == [ "" [ "a" ] "b" [ "c" ] "" ];
assert split "(a)|(c)" "abc" == [ "" [ "a" null ] "b" [ null "c" ] "" ];
assert split "([[:upper:]]+)" " FOO "
== [ " " [ "FOO" ] " " ];
```
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Fixed the parsing of multiline strings ending with an even number of
stars, like /** this **/.
Added test cases for comments.
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The implementation of "partition" in Nixpkgs is O(n^2) (because of the
use of ++), and for some reason was causing stack overflows in
multi-threaded evaluation (not sure why).
This reduces "nix-env -qa --drv-path" runtime by 0.197s and memory
usage by 298 MiB (in non-Boehm mode).
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The call to tmp_number.append had its arguments mixed up. Also, JSON
does not allow a trailing "," after array/object members.
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Implement floats
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"tests/lang.sh" can handle this.
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Fixes #679.
Note: on x86_64, SHA-512 is considerably faster than SHA-256 (198 MB/s
versus 131 MB/s).
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This can be used to implement functions like ‘imap’ (or for that
matter, ‘map’) without the quadratic complexity incurred by calling
‘++’ repeatedly.
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This is a generalisation of replaceChars in Nixpkgs.
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This fixes the quadratic behaviour of concatStrings/concatStringsSep
in Nixpkgs.
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These are used thousands of times during NixOS evaluation, so it's
useful to speed them up.
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baseNameOf: Don't copy paths to the store first
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The function ‘builtins.match’ takes a POSIX extended regular
expression and an arbitrary string. It returns ‘null’ if the string
does not match the regular expression. Otherwise, it returns a list
containing substring matches corresponding to parenthesis groups in
the regex. The regex must match the entire string (i.e. there is an
implied "^<pat>$" around the regex). For example:
match "foo" "foobar" => null
match "foo" "foo" => []
match "f(o+)(.*)" "foooobar" => ["oooo" "bar"]
match "(.*/)?([^/]*)" "/dir/file.nix" => ["/dir/" "file.nix"]
match "(.*/)?([^/]*)" "file.nix" => [null "file.nix"]
The following example finds all regular files with extension .nix or
.patch underneath the current directory:
let
findFiles = pat: dir: concatLists (mapAttrsToList (name: type:
if type == "directory" then
findFiles pat (dir + "/" + name)
else if type == "regular" && match pat name != null then
[(dir + "/" + name)]
else []) (readDir dir));
in findFiles ".*\\.(nix|patch)" (toString ./.)
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With this, attribute sets with a `__functor` attribute can be applied
just like normal functions. This can be used to attach arbitrary
metadata to a function without callers needing to treat it specially.
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