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Deprecate math.random() when $limit has units #1779

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Aug 18, 2022
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6 changes: 5 additions & 1 deletion CHANGELOG.md
Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,10 @@
* Properly consider `b > c` to be a superselector of `a > b > c`, and similarly
for other combinators.

* Deprecate use of `random()` when `$limit` has units to make it explicit that
`random()` currently ignores units. A future version will no longer ignore
units.

## 1.54.4

* Improve error messages when passing incorrect units that are also
Expand Down Expand Up @@ -38,7 +42,7 @@
* Add partial support for new media query syntax from Media Queries Level 4. The
only exception are logical operations nested within parentheses, as these were
previously interpreted differently as SassScript expressions.

A parenthesized media condition that begins with `not` or an opening
parenthesis now produces a deprecation warning. In a future release, these
will be interpreted as plain CSS instead.
Expand Down
23 changes: 20 additions & 3 deletions lib/src/functions/math.dart
Original file line number Diff line number Diff line change
Expand Up @@ -289,11 +289,28 @@ final _random = math.Random();

final _randomFunction = _function("random", r"$limit: null", (arguments) {
if (arguments[0] == sassNull) return SassNumber(_random.nextDouble());
var limit = arguments[0].assertNumber("limit").assertInt("limit");
if (limit < 1) {
var limit = arguments[0].assertNumber("limit");

if (limit.hasUnits) {
warn(
"math.random() will no longer ignore \$limit units ($limit) in a "
"future release.\n"
"\n"
"Recommendation: "
"math.random(math.div(\$limit, 1${limit.unitString})) * 1${limit.unitString}\n"
"\n"
"To preserve current behavior: "
"math.random(math.div(\$limit, 1${limit.unitString}))\n"
"\n"
"More info: https://sass-lang.com/d/random-with-units",
);
}

var limitScalar = limit.assertInt("limit");
if (limitScalar < 1) {
throw SassScriptException("\$limit: Must be greater than 0, was $limit.");
}
return SassNumber(_random.nextInt(limit) + 1);
return SassNumber(_random.nextInt(limitScalar) + 1);
});

final _div = _function("div", r"$number1, $number2", (arguments) {
Expand Down