nix/tests/functional/lang/eval-okay-replacestrings.nix

with builtins;

[ (replaceStrings ["o"] ["a"] "foobar")
  (replaceStrings ["o"] [""] "foobar")
  (replaceStrings ["oo"] ["u"] "foobar")
  (replaceStrings ["oo" "a"] ["a" "oo"] "foobar")
  (replaceStrings ["oo" "oo"] ["u" "i"] "foobar")
  (replaceStrings [""] ["X"] "abc")
  (replaceStrings [""] ["X"] "")
  (replaceStrings ["-"] ["_"] "a-b")
  (replaceStrings ["oo" "XX"] ["u" (throw "unreachable")] "foobar")
]
Add replaceStrings primop This is a generalisation of replaceChars in Nixpkgs. 2015-07-24 13:32:24 +00:00			`with builtins;`

			`[ (replaceStrings ["o"] ["a"] "foobar")`
			`(replaceStrings ["o"] [""] "foobar")`
			`(replaceStrings ["oo"] ["u"] "foobar")`
			`(replaceStrings ["oo" "a"] ["a" "oo"] "foobar")`
			`(replaceStrings ["oo" "oo"] ["u" "i"] "foobar")`
libexpr: Fix prim_replaceStrings() to work on an empty source string 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. 2018-02-19 15:52:33 +00:00			`(replaceStrings [""] ["X"] "abc")`
			`(replaceStrings [""] ["X"] "")`
			`(replaceStrings ["-"] ["_"] "a-b")`
primops: lazy evaluation of replaceStrings replacements The primop `builtins.replaceStrings` currently always strictly evaluates the replacement strings, however time and space are wasted for their computation if the corresponding pattern do not occur in the input string. This commit makes the evaluation of the replacement strings lazy by deferring their evaluation to when the corresponding pattern are matched and memoize the result for efficient retrieval on subsequent matches. The testcases for replaceStrings was updated to check for lazy evaluation of the replacements. A note was also added in the release notes to document the behavior change. 2023-05-25 04:37:00 +00:00			`(replaceStrings ["oo" "XX"] ["u" (throw "unreachable")] "foobar")`
Add replaceStrings primop This is a generalisation of replaceChars in Nixpkgs. 2015-07-24 13:32:24 +00:00			`]`