sass:selector

Compatibility:
Dart Sass
since (unreleased)
LibSass
Ruby Sass

Only Dart Sass currently supports loading built-in modules with @use. Users of other implementations must call functions using their global names instead.

Selector Values

The functions in this module inspect and manipulate selectors. Whenever they return a selector, it’s always a comma-separated list (the selector list) that contains space-separated lists (the complex selectors) that contain unquoted strings (the compound selectors). For example, the selector .main aside:hover, .sidebar p would be returned as:

@debug ((unquote(".main") unquote("aside:hover")),
        (unquote(".sidebar") unquote("p")));
// .main aside:hover, .sidebar p

Selector arguments to these functions may be in the same format, but they can also just be normal strings (quoted or unquoted), or a combination. For example, ".main aside:hover, .sidebar p" is a valid selector argument.

selector.is-superselector($super, $sub)
is-superselector($super, $sub) //=> boolean 

Returns whether the selector $super matches all the elements that the selector $sub matches.

Still returns true even if $super matches more elements than $sub.

The $super and $sub selectors may contain placeholder selectors, but not parent selectors.

SCSS Syntax

@debug selector.is-superselector("a", "a.disabled"); // true
@debug selector.is-superselector("a.disabled", "a"); // false
@debug selector.is-superselector("a", "sidebar a"); // true
@debug selector.is-superselector("sidebar a", "a"); // false
@debug selector.is-superselector("a", "a"); // true

Sass Syntax

@debug selector.is-superselector("a", "a.disabled")  // true
@debug selector.is-superselector("a.disabled", "a")  // false
@debug selector.is-superselector("a", "sidebar a")  // true
@debug selector.is-superselector("sidebar a", "a")  // false
@debug selector.is-superselector("a", "a")  // true
selector.append($selectors...)
selector-append($selectors...) //=> selector 

Combines $selectors without descendant combinators—that is, without whitespace between them.

If any selector in $selectors is a selector list, each complex selector is combined separately.

The $selectors may contain placeholder selectors, but not parent selectors.

See also selector.nest().

SCSS Syntax

@debug selector.append("a", ".disabled"); // a.disabled
@debug selector.append(".accordion", "__copy"); // .accordion__copy
@debug selector.append(".accordion", "__copy, __image");
// .accordion__copy, .accordion__image

Sass Syntax

@debug selector.append("a", ".disabled")  // a.disabled
@debug selector.append(".accordion", "__copy")  // .accordion__copy
@debug selector.append(".accordion", "__copy, __image")
// .accordion__copy, .accordion__image
selector.extend($selector, $extendee, $extender)
selector-extend($selector, $extendee, $extender) //=> selector 

Extends $selector as with the @extend rule.

Returns a copy of $selector modified with the following @extend rule:

#{$extender} {
  @extend #{$extendee};
}

In other words, replaces all instances of $extendee in $selector with $extendee, $extender. If $selector doesn’t contain $extendee, returns it as-is.

The $selector, $extendee, and $extender selectors may contain placeholder selectors, but not parent selectors.

See also selector.replace().

SCSS Syntax

@debug selector.extend("a.disabled", "a", ".link"); // a.disabled, .link.disabled
@debug selector.extend("a.disabled", "h1", "h2"); // a.disabled
@debug selector.extend(".guide .info", ".info", ".content nav.sidebar");
// .guide .info, .guide .content nav.sidebar, .content .guide nav.sidebar

Sass Syntax

@debug selector.extend("a.disabled", "a", ".link")  // a.disabled, .link.disabled
@debug selector.extend("a.disabled", "h1", "h2")  // a.disabled
@debug selector.extend(".guide .info", ".info", ".content nav.sidebar")
// .guide .info, .guide .content nav.sidebar, .content .guide nav.sidebar
selector.nest($selectors...)
selector-nest($selectors...) //=> selector 

Combines $selectors as though they were nested within one another in the stylesheet.

The $selectors may contain placeholder selectors. Unlike other selector functions, all of them except the first may also contain parent selectors.

See also selector.append().

SCSS Syntax

@debug selector.nest("ul", "li"); // ul li
@debug selector.nest(".alert, .warning", "p"); // .alert p, .warning p
@debug selector.nest(".alert", "&:hover"); // .alert:hover
@debug selector.nest(".accordion", "&__copy"); // .accordion__copy

Sass Syntax

@debug selector.nest("ul", "li")  // ul li
@debug selector.nest(".alert, .warning", "p")  // .alert p, .warning p
@debug selector.nest(".alert", "&:hover")  // .alert:hover
@debug selector.nest(".accordion", "&__copy")  // .accordion__copy
selector.parse($selector)
selector-parse($selector) //=> selector 

Returns $selector in the selector value format.

SCSS Syntax

@debug selector.parse(".main aside:hover, .sidebar p");
// ((unquote(".main") unquote("aside:hover")),
//  (unquote(".sidebar") unquote("p")))

Sass Syntax

@debug selector.parse(".main aside:hover, .sidebar p")
// ((unquote(".main") unquote("aside:hover")),
//  (unquote(".sidebar") unquote("p")))
selector.replace($selector, $original, $replacement)
selector-replace($selector, $original, $replacement) //=> selector 

Returns a copy of $selector with all instances of $original replaced by $replacement.

This uses the @extend rule’s intelligent unification to make sure $replacement is seamlessly integrated into $selector. If $selector doesn’t contain $original, returns it as-is.

The $selector, $original, and $replacement selectors may contain placeholder selectors, but not parent selectors.

See also selector.extend().

SCSS Syntax

@debug selector.replace("a.disabled", "a", ".link"); // .link.disabled
@debug selector.replace("a.disabled", "h1", "h2"); // a.disabled
@debug selector.replace(".guide .info", ".info", ".content nav.sidebar");
// .guide .content nav.sidebar, .content .guide nav.sidebar

Sass Syntax

@debug selector.replace("a.disabled", "a", ".link")  // .link.disabled
@debug selector.replace("a.disabled", "h1", "h2")  // a.disabled
@debug selector.replace(".guide .info", ".info", ".content nav.sidebar")
// .guide .content nav.sidebar, .content .guide nav.sidebar
selector.unify($selector1, $selector2)
selector.unify($selector1, $selector2) //=> selector | null 

Returns a selector that matches only elements matched by both $selector1 and $selector2.

Returns null if $selector1 and $selector2 don’t match any of the same elements, or if there’s no selector that can express their overlap.

Like selectors generated by the @extend rule, the returned selector isn’t guaranteed to match all the elements matched by both $selector1 and $selector2 if they’re both complex selectors.

SCSS Syntax

@debug selector.unify("a", ".disabled"); // a.disabled
@debug selector.unify("a.disabled", "a.outgoing"); // a.disabled.outgoing
@debug selector.unify("a", "h1"); // null
@debug selector.unify(".warning a", "main a"); // .warning main a, main .warning a

Sass Syntax

@debug selector.unify("a", ".disabled")  // a.disabled
@debug selector.unify("a.disabled", "a.outgoing")  // a.disabled.outgoing
@debug selector.unify("a", "h1")  // null
@debug selector.unify(".warning a", "main a")  // .warning main a, main .warning a
selector.simple-selectors($selector)
simple-selectors($selector) //=> list 

Returns a list of simple selectors in $selector.

The $selector must be a single string that contains a compound selector. This means it may not contains combinators (including spaces) or commas.

The returned list is comma-separated, and the simple selectors are unquoted strings.

SCSS Syntax

@debug selector.compound-selectors("a.disabled"); // a, .disabled
@debug selector.compound-selectors("main.blog:after"); // main, .blog, :after

Sass Syntax

@debug selector.compound-selectors("a.disabled")  // a, .disabled
@debug selector.compound-selectors("main.blog:after")  // main, .blog, :after