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libexpr: experimental pipe operators

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This commit is contained in:
Ryan Hendrickson 2024-07-24 13:17:28 -04:00
parent 874c1bdbbf
commit e086d5d899
10 changed files with 174 additions and 9 deletions
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3
tests/unit/libexpr/main.cc
View file

@ -34,6 +34,9 @@ int main (int argc, char **argv) {
setEnv("_NIX_TEST_NO_SANDBOX", "1");
#endif
// For pipe operator tests in trivial.cc
experimentalFeatureSettings.set("experimental-features", "pipe-operators");
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}

54
tests/unit/libexpr/trivial.cc
View file

@ -182,6 +182,60 @@ namespace nix {
ASSERT_THAT(v, IsIntEq(15));
}
TEST_F(TrivialExpressionTest, forwardPipe) {
auto v = eval("1 |> builtins.add 2 |> builtins.mul 3");
ASSERT_THAT(v, IsIntEq(9));
}
TEST_F(TrivialExpressionTest, backwardPipe) {
auto v = eval("builtins.add 1 <| builtins.mul 2 <| 3");
ASSERT_THAT(v, IsIntEq(7));
}
TEST_F(TrivialExpressionTest, forwardPipeEvaluationOrder) {
auto v = eval("1 |> null |> (x: 2)");
ASSERT_THAT(v, IsIntEq(2));
}
TEST_F(TrivialExpressionTest, backwardPipeEvaluationOrder) {
auto v = eval("(x: 1) <| null <| 2");
ASSERT_THAT(v, IsIntEq(1));
}
TEST_F(TrivialExpressionTest, differentPipeOperatorsDoNotAssociate) {
ASSERT_THROW(eval("(x: 1) <| 2 |> (x: 3)"), ParseError);
}
TEST_F(TrivialExpressionTest, differentPipeOperatorsParensLeft) {
auto v = eval("((x: 1) <| 2) |> (x: 3)");
ASSERT_THAT(v, IsIntEq(3));
}
TEST_F(TrivialExpressionTest, differentPipeOperatorsParensRight) {
auto v = eval("(x: 1) <| (2 |> (x: 3))");
ASSERT_THAT(v, IsIntEq(1));
}
TEST_F(TrivialExpressionTest, forwardPipeLowestPrecedence) {
auto v = eval("false -> true |> (x: !x)");
ASSERT_THAT(v, IsFalse());
}
TEST_F(TrivialExpressionTest, backwardPipeLowestPrecedence) {
auto v = eval("(x: !x) <| false -> true");
ASSERT_THAT(v, IsFalse());
}
TEST_F(TrivialExpressionTest, forwardPipeStrongerThanElse) {
auto v = eval("if true then 1 else 2 |> 3");
ASSERT_THAT(v, IsIntEq(1));
}
TEST_F(TrivialExpressionTest, backwardPipeStrongerThanElse) {
auto v = eval("if true then 1 else 2 <| 3");
ASSERT_THAT(v, IsIntEq(1));
}
TEST_F(TrivialExpressionTest, bindOr) {
auto v = eval("{ or = 1; }");
ASSERT_THAT(v, IsAttrsOfSize(1));