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expr: support arbitrary precision integers (#2271)

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* expr: support arbitrary precision integers

Instead of i64s we now use BigInts for integer operations. This means
that no result or input can be out of range.
The representation of integer flags was changed from i64 to u8 to make
their intention clearer.

* expr: allow big numbers as arguments as well

Also adds some tests

* expr: use num-traits to check bigints for 0 and 1

* expr: remove obsolete refs

match ergonomics made these avoidable.

* formatting

Co-authored-by: Sylvestre Ledru <sylvestre@debian.org>
This commit is contained in:
Michael Debertol 2021-05-29 23:25:23 +02:00 • committed by GitHub
parent 6e1a68ce9a
commit d821719c67
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 128 additions and 84 deletions
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78
tests/by-util/test_expr.rs
View file

@ -2,55 +2,95 @@ use crate::common::util::*;
#[test]
fn test_simple_arithmetic() {
new_ucmd!().args(&["1", "+", "1"]).run().stdout_is("2\n");
new_ucmd!()
.args(&["1", "+", "1"])
.succeeds()
.stdout_only("2\n");
new_ucmd!().args(&["1", "-", "1"]).run().stdout_is("0\n");
new_ucmd!()
.args(&["1", "-", "1"])
.fails()
.status_code(1)
.stdout_only("0\n");
new_ucmd!().args(&["3", "*", "2"]).run().stdout_is("6\n");
new_ucmd!()
.args(&["3", "*", "2"])
.succeeds()
.stdout_only("6\n");
new_ucmd!().args(&["4", "/", "2"]).run().stdout_is("2\n");
new_ucmd!()
.args(&["4", "/", "2"])
.succeeds()
.stdout_only("2\n");
}
#[test]
fn test_complex_arithmetic() {
let run = new_ucmd!()
new_ucmd!()
.args(&["9223372036854775807", "+", "9223372036854775807"])
.run();
run.stdout_is("");
run.stderr_is("expr: +: Numerical result out of range");
.succeeds()
.stdout_only("18446744073709551614\n");
let run = new_ucmd!().args(&["9", "/", "0"]).run();
run.stdout_is("");
run.stderr_is("expr: division by zero");
new_ucmd!()
.args(&[
"92233720368547758076549841651981984981498415651",
"%",
"922337203685",
])
.succeeds()
.stdout_only("533691697086\n");
new_ucmd!()
.args(&[
"92233720368547758076549841651981984981498415651",
"*",
"922337203685",
])
.succeeds()
.stdout_only("85070591730190566808700855121818604965830915152801178873935\n");
new_ucmd!()
.args(&[
"92233720368547758076549841651981984981498415651",
"-",
"922337203685",
])
.succeeds()
.stdout_only("92233720368547758076549841651981984059161211966\n");
new_ucmd!()
.args(&["9", "/", "0"])
.fails()
.stderr_only("expr: division by zero\n");
}
#[test]
fn test_parenthesis() {
new_ucmd!()
.args(&["(", "1", "+", "1", ")", "*", "2"])
.run()
.stdout_is("4\n");
.succeeds()
.stdout_only("4\n");
}
#[test]
fn test_or() {
new_ucmd!()
.args(&["0", "|", "foo"])
.run()
.stdout_is("foo\n");
.succeeds()
.stdout_only("foo\n");
new_ucmd!()
.args(&["foo", "|", "bar"])
.run()
.stdout_is("foo\n");
.succeeds()
.stdout_only("foo\n");
}
#[test]
fn test_and() {
new_ucmd!()
.args(&["foo", "&", "1"])
.run()
.stdout_is("foo\n");
.succeeds()
.stdout_only("foo\n");
new_ucmd!().args(&["", "&", "1"]).run().stdout_is("0\n");
}