mirror of
https://github.com/danog/sass-site.git
synced 2024-12-15 02:47:36 +01:00
261 lines
10 KiB
Plaintext
261 lines
10 KiB
Plaintext
---
|
|
title: sass:selector
|
|
---
|
|
|
|
<%= partial '../snippets/built-in-module-status' %>
|
|
|
|
## 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:
|
|
|
|
[list]: ../values/lists
|
|
[unquoted strings]: ../values/strings#unquoted
|
|
|
|
```scss
|
|
@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.
|
|
|
|
|
|
<% function 'selector.is-superselector($super, $sub)',
|
|
'is-superselector($super, $sub)',
|
|
returns: 'boolean' do %>
|
|
Returns whether the selector `$super` matches all the elements that the
|
|
selector `$sub` matches.
|
|
|
|
Still returns true even if `$super` matches *more* elements than `$sub`.
|
|
|
|
The `$super` and `$sub` selectors may contain [placeholder selectors][], but
|
|
not [parent selectors][].
|
|
|
|
[placeholder selectors]: ../style-rules/placeholder-selectors
|
|
[parent selectors]: ../style-rules/parent-selector
|
|
|
|
<% example(autogen_css: false) do %>
|
|
@debug selector.is-superselector("a", "a.disabled"); // true
|
|
@debug selector.is-superselector("a.disabled", "a"); // false
|
|
@debug selector.is-superselector("a", "sidebar a"); // true
|
|
@debug selector.is-superselector("sidebar a", "a"); // false
|
|
@debug selector.is-superselector("a", "a"); // true
|
|
===
|
|
@debug selector.is-superselector("a", "a.disabled") // true
|
|
@debug selector.is-superselector("a.disabled", "a") // false
|
|
@debug selector.is-superselector("a", "sidebar a") // true
|
|
@debug selector.is-superselector("sidebar a", "a") // false
|
|
@debug selector.is-superselector("a", "a") // true
|
|
<% end %>
|
|
<% end %>
|
|
|
|
|
|
<% function 'selector.append($selectors...)',
|
|
'selector-append($selectors...)',
|
|
returns: 'selector' do %>
|
|
Combines `$selectors` without [descendant combinators][]—that is, without
|
|
whitespace between them.
|
|
|
|
[descendant combinators]: https://developer.mozilla.org/en-US/docs/Web/CSS/Descendant_selectors
|
|
|
|
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][].
|
|
|
|
[placeholder selectors]: ../style-rules/placeholder-selectors
|
|
[parent selectors]: ../style-rules/parent-selector
|
|
|
|
See also [`selector.nest()`](#nest).
|
|
|
|
<% example(autogen_css: false) do %>
|
|
@debug selector.append("a", ".disabled"); // a.disabled
|
|
@debug selector.append(".accordion", "__copy"); // .accordion__copy
|
|
@debug selector.append(".accordion", "__copy, __image");
|
|
// .accordion__copy, .accordion__image
|
|
===
|
|
@debug selector.append("a", ".disabled") // a.disabled
|
|
@debug selector.append(".accordion", "__copy") // .accordion__copy
|
|
@debug selector.append(".accordion", "__copy, __image")
|
|
// .accordion__copy, .accordion__image
|
|
<% end %>
|
|
<% end %>
|
|
|
|
|
|
<% function 'selector.extend($selector, $extendee, $extender)',
|
|
'selector-extend($selector, $extendee, $extender)',
|
|
returns: 'selector' do %>
|
|
Extends `$selector` as with the [`@extend` rule][].
|
|
|
|
[`@extend` rule]: ../at-rules/extend
|
|
|
|
Returns a copy of `$selector` modified with the following `@extend` rule:
|
|
|
|
```scss
|
|
#{$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][].
|
|
|
|
[placeholder selectors]: ../style-rules/placeholder-selectors
|
|
[parent selectors]: ../style-rules/parent-selector
|
|
|
|
See also [`selector.replace()`](#replace).
|
|
|
|
<% example(autogen_css: false) do %>
|
|
@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
|
|
===
|
|
@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
|
|
<% end %>
|
|
<% end %>
|
|
|
|
|
|
<% function 'selector.nest($selectors...)',
|
|
'selector-nest($selectors...)',
|
|
returns: 'selector' do %>
|
|
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][].
|
|
|
|
[placeholder selectors]: ../style-rules/placeholder-selectors
|
|
[parent selectors]: ../style-rules/parent-selector
|
|
|
|
See also [`selector.append()`](#append).
|
|
|
|
<% example(autogen_css: false) do %>
|
|
@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
|
|
===
|
|
@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
|
|
<% end %>
|
|
<% end %>
|
|
|
|
|
|
<% function 'selector.parse($selector)',
|
|
'selector-parse($selector)',
|
|
returns: 'selector' do %>
|
|
Returns `$selector` in the [selector value](#selector-values) format.
|
|
|
|
<% example(autogen_css: false) do %>
|
|
@debug selector.parse(".main aside:hover, .sidebar p");
|
|
// ((unquote(".main") unquote("aside:hover")),
|
|
// (unquote(".sidebar") unquote("p")))
|
|
===
|
|
@debug selector.parse(".main aside:hover, .sidebar p")
|
|
// ((unquote(".main") unquote("aside:hover")),
|
|
// (unquote(".sidebar") unquote("p")))
|
|
<% end %>
|
|
<% end %>
|
|
|
|
|
|
<% function 'selector.replace($selector, $original, $replacement)',
|
|
'selector-replace($selector, $original, $replacement)',
|
|
returns: 'selector' do %>
|
|
Returns a copy of `$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.
|
|
|
|
[`@extend` rule]: ../at-rules/extend
|
|
[intelligent unification]: ../at-rules/extend#how-it-works
|
|
|
|
The `$selector`, `$original`, and `$replacement` selectors may contain
|
|
[placeholder selectors][], but not [parent selectors][].
|
|
|
|
[placeholder selectors]: ../style-rules/placeholder-selectors
|
|
[parent selectors]: ../style-rules/parent-selector
|
|
|
|
See also [`selector.extend()`](#extend).
|
|
|
|
<% example(autogen_css: false) do %>
|
|
@debug selector.replace("a.disabled", "a", ".link"); // .link.disabled
|
|
@debug selector.replace("a.disabled", "h1", "h2"); // a.disabled
|
|
@debug selector.replace(".guide .info", ".info", ".content nav.sidebar");
|
|
// .guide .content nav.sidebar, .content .guide nav.sidebar
|
|
===
|
|
@debug selector.replace("a.disabled", "a", ".link") // .link.disabled
|
|
@debug selector.replace("a.disabled", "h1", "h2") // a.disabled
|
|
@debug selector.replace(".guide .info", ".info", ".content nav.sidebar")
|
|
// .guide .content nav.sidebar, .content .guide nav.sidebar
|
|
<% end %>
|
|
<% end %>
|
|
|
|
|
|
<% function 'selector.unify($selector1, $selector2)',
|
|
'selector-unify($selector1, $selector2)',
|
|
returns: 'selector | null' do %>
|
|
Returns a selector that matches only elements matched by *both* `$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
|
|
`$selector2` if they're both complex selectors.
|
|
|
|
[`@extend` rule]: ../at-rules/extend#html-heuristics
|
|
|
|
<% example(autogen_css: false) do %>
|
|
@debug selector.unify("a", ".disabled"); // a.disabled
|
|
@debug selector.unify("a.disabled", "a.outgoing"); // a.disabled.outgoing
|
|
@debug selector.unify("a", "h1"); // null
|
|
@debug selector.unify(".warning a", "main a"); // .warning main a, main .warning a
|
|
===
|
|
@debug selector.unify("a", ".disabled") // a.disabled
|
|
@debug selector.unify("a.disabled", "a.outgoing") // a.disabled.outgoing
|
|
@debug selector.unify("a", "h1") // null
|
|
@debug selector.unify(".warning a", "main a") // .warning main a, main .warning a
|
|
<% end %>
|
|
<% end %>
|
|
|
|
|
|
<% function 'selector.simple-selectors($selector)',
|
|
'simple-selectors($selector)',
|
|
returns: 'list' do %>
|
|
Returns a list of simple selectors in `$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.
|
|
|
|
<% example(autogen_css: false) do %>
|
|
@debug selector.simple-selectors("a.disabled"); // a, .disabled
|
|
@debug selector.simple-selectors("main.blog:after"); // main, .blog, :after
|
|
===
|
|
@debug selector.simple-selectors("a.disabled") // a, .disabled
|
|
@debug selector.simple-selectors("main.blog:after") // main, .blog, :after
|
|
<% end %>
|
|
<% end %>
|