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139 lines
4.1 KiB
Plaintext
139 lines
4.1 KiB
Plaintext
---
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title: "Breaking Change: Slash as Division"
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introduction: >
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Sass currently treats `/` as a division operation in some contexts and a
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separator in others. This makes it difficult for Sass users to tell what any
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given `/` will mean, and makes it hard to work with new CSS features that use
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`/` as a separator.
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---
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<% impl_status dart: :partial, libsass: false, ruby: false %>
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Today, Sass uses [complex heuristics][] to figure out whether a `/` should be
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treated as division or a separator. Even then, as a separator it just produces
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an unquoted string that's difficult to inspect from within Sass. As more and
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more CSS features like [CSS Grid][] and the [new `rgb()` and `hsl()` syntax][]
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use `/` as a separator, this is becoming more and more painful to Sass users.
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[complex heuristics]: ../operators/numeric#slash-separated-values
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[CSS Grid]: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-row
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[new `rgb()` and `hsl()` syntax]: https://drafts.csswg.org/css-color/#rgb-functions
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Because Sass is a CSS superset, we're matching CSS's syntax by redefining `/` to
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be *only* a separator. `/` will be treated as a new type of list separator,
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similar to how `,` works today. Division will instead be written using the new
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`math.div()` function. This function will behave exactly the same as `/` does
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today.
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This deprecation does not affect uses of `/` inside `calc()` expressions.
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<% example do %>
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@use "sass:math";
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// Future Sass, doesn't work yet!
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.item3 {
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$row: span math.div(6, 2) / 7; // A two-element slash-separated list.
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grid-row: $row;
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}
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===
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@use "sass:math"
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// Future Sass, doesn't work yet!
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.item3
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$row: span math.div(6, 2) / 7 // A two-element slash-separated list.
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grid-row: $row
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===
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.item3 {
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grid-row: span 3 / 7;
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}
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<% end %>
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## Transition Period
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<% impl_status dart: "1.33.0", libsass: false, ruby: false,
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feature: "math.div() and list.slash()" %>
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To ease the transition, we've begun by adding the `math.div()` function. The `/`
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operator still does division for now, but it also prints a deprecation warning
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when it does so. Users should switch all division to use `math.div()` instead.
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<%= partial '../snippets/silence-deprecations' %>
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<% example(autogen_css: false) do %>
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@use "sass:math";
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// WRONG, will not work in future Sass versions.
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@debug (12px/4px); // 3
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// RIGHT, will work in future Sass versions.
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@debug math.div(12px, 4px); // 3
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===
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@use "sass:math"
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// WRONG, will not work in future Sass versions.
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@debug (12px/4px) // 3
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// RIGHT, will work in future Sass versions.
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@debug math.div(12px, 4px) // 3
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<% end %>
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Slash-separated lists will also be available in the transition period. Because
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they can't be created with `/` yet, the `list.slash()` function will be added to
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create them. You will also be able to pass `"slash"` as the `$separator` to the
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[`list.join()` function][] and the [`list.append()` function][].
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[`list.join()` function]: ../modules/list#join
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[`list.append()` function]: ../modules/list#append
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<% example do %>
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@use "sass:list";
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@use "sass:math";
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.item3 {
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$row: list.slash(span math.div(6, 2), 7);
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grid-row: $row;
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}
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===
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@use "sass:list"
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@use "sass:math"
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.item3
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$row: list.slash(span math.div(6, 2), 7)
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grid-row: $row
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===
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.item3 {
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grid-row: span 3 / 7;
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}
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<% end %>
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<% impl_status dart: "1.40.0", libsass: false, ruby: false, feature: "First-class calc" %>
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Alternatively, users can wrap division operations inside a `calc()` expression,
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which Sass will simplify to a single number.
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<% example(autogen_css: false) do %>
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// WRONG, will not work in future Sass versions.
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@debug (12px/4px); // 3
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// RIGHT, will work in future Sass versions.
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@debug calc(12px / 4px); // 3
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===
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// WRONG, will not work in future Sass versions.
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@debug (12px/4px) // 3
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// RIGHT, will work in future Sass versions.
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@debug calc(12px / 4px) // 3
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<% end %>
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## Automatic Migration
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You can use [the Sass migrator][] to automatically update your stylesheets to
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use `math.div()` and `list.slash()`.
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[the Sass migrator]: https://github.com/sass/migrator#readme
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```shellsession
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$ npm install -g sass-migrator
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$ sass-migrator division **/*.scss
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```
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