mirror of
https://github.com/nushell/nushell.git
synced 2024-11-25 09:53:43 +01:00
5bfec20244
## description this pr adds [match guards](https://doc.rust-lang.org/reference/expressions/match-expr.html#match-guards) to match patterns ```nushell match $x { _ if $x starts-with 'nu' => {}, $x => {} } ``` these work pretty much like rust's match guards, with few limitations: 1. multiple matches using the `|` are not (yet?) supported ```nushell match $num { 0 | _ if (is-odd $num) => {}, _ => {} } ``` 2. blocks cannot be used as guards, (yet?) ```nushell match $num { $x if { $x ** $x == inf } => {}, _ => {} } ``` ## checklist - [x] syntax - [x] syntax highlighting[^1] - [x] semantics - [x] tests - [x] clean up [^1]: defered for another pr
251 lines
7.0 KiB
Rust
251 lines
7.0 KiB
Rust
use nu_test_support::nu;
|
|
|
|
#[test]
|
|
fn match_for_range() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match 3 { 1..10 => { print "success" } }"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_for_range_unmatched() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match 11 { 1..10 => { print "failure" }, _ => { print "success" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_for_record() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match {a: 11} { {a: $b} => { print $b }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "11");
|
|
}
|
|
|
|
#[test]
|
|
fn match_for_record_shorthand() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match {a: 12} { {$a} => { print $a }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "12");
|
|
}
|
|
|
|
#[test]
|
|
fn match_list() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match [1, 2] { [$a] => { print $"single: ($a)" }, [$b, $c] => {print $"double: ($b) ($c)"}}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "double: 1 2");
|
|
}
|
|
|
|
#[test]
|
|
fn match_list_rest_ignore() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match [1, 2] { [$a, ..] => { print $"single: ($a)" }, [$b, $c] => {print $"double: ($b) ($c)"}}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "single: 1");
|
|
}
|
|
|
|
#[test]
|
|
fn match_list_rest() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match [1, 2, 3] { [$a, ..$remainder] => { print $"single: ($a) ($remainder | math sum)" }, [$b, $c] => {print $"double: ($b) ($c)"}}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "single: 1 5");
|
|
}
|
|
|
|
#[test]
|
|
fn match_constant_1() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match 2 { 1 => { print "failure"}, 2 => { print "success" }, 3 => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_constant_2() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match 2.3 { 1.4 => { print "failure"}, 2.3 => { print "success" }, 3 => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_constant_3() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match true { false => { print "failure"}, true => { print "success" }, 3 => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_constant_4() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match "def" { "abc" => { print "failure"}, "def" => { print "success" }, "ghi" => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_constant_5() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match 2019-08-23 { 2010-01-01 => { print "failure"}, 2019-08-23 => { print "success" }, 2020-02-02 => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_constant_6() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match 6sec { 2sec => { print "failure"}, 6sec => { print "success" }, 1min => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_constant_7() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match 1kib { 1kb => { print "failure"}, 1kib => { print "success" }, 2kb => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success");
|
|
}
|
|
|
|
#[test]
|
|
fn match_or_pattern() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match {b: 7} { {a: $a} | {b: $b} => { print $"success: ($b)" }, _ => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success: 7");
|
|
}
|
|
|
|
#[test]
|
|
fn match_or_pattern_overlap_1() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match {a: 7} { {a: $b} | {b: $b} => { print $"success: ($b)" }, _ => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success: 7");
|
|
}
|
|
|
|
#[test]
|
|
fn match_or_pattern_overlap_2() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"match {b: 7} { {a: $b} | {b: $b} => { print $"success: ($b)" }, _ => { print "failure" }}"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "success: 7");
|
|
}
|
|
|
|
#[test]
|
|
fn match_doesnt_overwrite_variable() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
r#"let b = 100; match 55 { $b => {} }; print $b"#
|
|
);
|
|
// Make sure we don't see any of these values in the output
|
|
// As we do not auto-print loops anymore
|
|
assert_eq!(actual.out, "100");
|
|
}
|
|
|
|
#[test]
|
|
fn match_with_guard() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
"match [1 2 3] { [$x, ..] if $x mod 2 == 0 => { $x }, $x => { 2 } }"
|
|
);
|
|
|
|
assert_eq!(actual.out, "2");
|
|
}
|
|
|
|
#[test]
|
|
fn match_with_guard_block_as_guard() {
|
|
// this should work?
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
"match 4 { $x if { $x + 20 > 25 } => { 'good num' }, _ => { 'terrible num' } }"
|
|
);
|
|
|
|
assert!(actual.err.contains("Match guard not bool"));
|
|
}
|
|
|
|
#[test]
|
|
fn match_with_guard_parens_expr_as_guard() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
"match 4 { $x if ($x + 20 > 25) => { 'good num' }, _ => { 'terrible num' } }"
|
|
);
|
|
|
|
assert_eq!(actual.out, "terrible num");
|
|
}
|
|
|
|
#[test]
|
|
fn match_with_guard_not_bool() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
"match 4 { $x if $x + 1 => { 'err!()' }, _ => { 'unreachable!()' } }"
|
|
);
|
|
|
|
assert!(actual.err.contains("Match guard not bool"));
|
|
}
|
|
|
|
#[test]
|
|
fn match_with_guard_no_expr_after_if() {
|
|
let actual = nu!(
|
|
cwd: ".",
|
|
"match 4 { $x if => { 'err!()' }, _ => { 'unreachable!()' } }"
|
|
);
|
|
|
|
assert!(actual.err.contains("Match guard without an expression"));
|
|
}
|