/
_functions.scss
1323 lines (1105 loc) · 31.7 KB
/
_functions.scss
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/*
========================================
Functions
----------------------------------------
*/
// The following vars need to be set
// here, before the rest of the system
// variables are set
$root-font-size: if($theme-respect-user-font-size, 100%, $theme-root-font-size);
$root-font-size-equiv: if(
$theme-respect-user-font-size,
16px,
$theme-root-font-size
);
/*
========================================
General-purpose functions
----------------------------------------
*/
/*
----------------------------------------
map-deep-get()
----------------------------------------
@author Hugo Giraudel
@access public
@param {Map} $map - Map
@param {Arglist} $keys - Key chain
@return {*} - Desired value
----------------------------------------
*/
@function map-deep-get($map, $keys...) {
@each $key in $keys {
$map: map-get($map, $key);
}
@return $map;
}
/*
----------------------------------------
strip-unit()
----------------------------------------
Remove the unit of a length
@author Hugo Giraudel
@param {Number} $number - Number to remove unit from
@return {Number} - Unitless number
----------------------------------------
*/
@function strip-unit($number) {
@if type-of($number) == "number" and not unitless($number) {
@return $number / ($number * 0 + 1);
}
@return $number;
}
/*
----------------------------------------
multi-cat()
----------------------------------------
Concatenate two lists
----------------------------------------
*/
@function multi-cat($list1, $list2) {
$this-list: ();
@each $e in $list1 {
@each $ee in $list2 {
$this-block: $e + $ee;
$this-list: join($this-list, $this-block);
}
}
@return $this-list;
}
/*
----------------------------------------
map-collect()
----------------------------------------
Collect multiple maps into a single
large map
source: https://gist.github.com/bigglesrocks/d75091700f8f2be5abfe
----------------------------------------
*/
@function map-collect($maps...) {
$collection: ();
@each $map in $maps {
$collection: map-merge($collection, $map);
}
@return $collection;
}
/*
----------------------------------------
smart-quote()
----------------------------------------
Quotes strings
Inspects `px`, `xs`, and `xl` numbers
Leaves bools as is
----------------------------------------
*/
@function smart-quote($value) {
@if type-of($value) == "string" {
@return quote($value);
}
@if type-of($value) == "number" and index(("px", "xl", "xs"), unit($value)) {
@return inspect($value);
}
@if type-of($value) == "color" {
@error 'Only use quoted color tokens in USWDS functions and mixins. '
+ 'See designsystem.digital.gov/design-tokens/color '
+ 'for more information.';
}
@return $value;
}
/*
----------------------------------------
remove()
----------------------------------------
Remove a value from a list
----------------------------------------
*/
@function remove($list, $value, $recursive: false) {
$result: ();
@for $i from 1 through length($list) {
@if type-of(nth($list, $i)) == list and $recursive {
$result: append($result, remove(nth($list, $i), $value, $recursive));
} @else if nth($list, $i) != $value {
$result: append($result, nth($list, $i));
}
}
@return $result;
}
/*
----------------------------------------
strunquote()
----------------------------------------
Unquote a string
----------------------------------------
*/
@function strunquote($value) {
@if type-of($value) == "string" {
$value: unquote($value);
}
@return $value;
}
/*
----------------------------------------
to-map()
----------------------------------------
Convert a single value to a USWDS
value map.
Candidate for deprecation if we remove
isReadable
----------------------------------------
*/
@function to-map($key, $values) {
$l: length($values);
@if $key == "noModifier" or $key == "noValue" {
$key: "";
}
@return (slug: $key, content: $values);
}
/*
----------------------------------------
base-to-map()
----------------------------------------
Convert a single base to a USWDS
value map.
Candidate for deprecation if we remove
isReadable
----------------------------------------
*/
@function base-to-map($values) {
$l: length($values);
@if $l == 1 or nth($values, $l) != isReadable {
@return (slug: $values, isReadable: true);
} @else {
$values: remove($values, isReadable);
@return (slug: unquote(nth($values, 1)), isReadable: true);
}
}
/*
----------------------------------------
ns()
----------------------------------------
Add a namesspace of $type if that
namespace is set to output
----------------------------------------
*/
@function ns($type) {
$type: smart-quote($type);
@if not map-deep-get($theme-namespace, $type, output) {
@return "";
}
@return map-deep-get($theme-namespace, $type, namespace);
}
/*
----------------------------------------
de-list()
----------------------------------------
Transform a one-element list or arglist
into that single element.
----------------------------------------
(1) => 1
((1)) => (1)
----------------------------------------
*/
@function de-list($value) {
$types: ("list", "arglist");
@if not index($types, type-of($value)) {
@return $value;
}
$output: if(length($value) == 1, nth($value, 1), $value);
@return $output;
}
/*
----------------------------------------
unpack()
----------------------------------------
Create lists of single items from lists
of lists.
----------------------------------------
(1, (2.1, 2.2), 3) -->
(1, 2.1, 2.2, 3)
----------------------------------------
*/
@function unpack($value) {
$output: ();
@if length($value) == 0 {
@return $value;
}
@each $i in $value {
@if type-of($i) == "list" {
@each $ii in $i {
$output: append($output, $ii, comma);
}
} @else {
$output: append($output, $i, comma);
}
}
@return de-list($output);
}
/*
----------------------------------------
get-last()
----------------------------------------
Return the last item of a list,
Return null if the value is null
----------------------------------------
*/
@function get-last($props) {
$length: length($props);
$last: if($length == 0, null, nth($props, -1));
@return $last;
}
/*
----------------------------------------
has-important()
----------------------------------------
Check to see if `!important` is
being passed in a mixin's props
----------------------------------------
*/
@function has-important($props) {
$props: de-list($props);
@if get-last($props) == "!important" {
@return true;
}
@return false;
}
/*
----------------------------------------
append-important()
----------------------------------------
Append `!important` to a list
----------------------------------------
*/
@function append-important($source, $destination) {
@if get-last($source) == "!important" {
@return append($destination, !important, comma);
}
@return $destination;
}
/*
----------------------------------------
spacing-multiple()
----------------------------------------
Converts a spacing unit multiple into
the desired final units (currently rem)
----------------------------------------
*/
@function spacing-multiple($unit) {
$grid-to-rem: ($system-spacing-grid-base * $unit) / $root-font-size-equiv *
1rem;
@return $grid-to-rem;
}
/*
----------------------------------------
rem-to-px()
----------------------------------------
Converts a value in rem to a value in px
----------------------------------------
*/
@function rem-to-px($value-in-rem) {
@if unit($value-in-rem) == "rem" {
$rem-to-px: ($value-in-rem / 1rem) * $root-font-size-equiv;
@return $rem-to-px;
}
@if unit($value-in-rem) != "px" {
@error 'This value must be in either px or rem';
}
@return $value-in-rem;
}
/*
----------------------------------------
rem-to-user-em()
----------------------------------------
Converts a value in rem to a value in
[user-settings] em for use in media
queries
----------------------------------------
*/
@function rem-to-user-em($grid-in-rem) {
$rem-to-user-em: ($grid-in-rem / 1rem) * 1em;
@return $rem-to-user-em;
}
/*
----------------------------------------
validate-typeface-token()
----------------------------------------
Check to see if a typeface-token exists.
Throw an error if a passed token does
not exist in the typeface-token map.
----------------------------------------
*/
@function validate-typeface-token($typeface-token) {
@if not map-has-key($all-typeface-tokens, $typeface-token) {
@error '`#{$typeface-token}` is not a valid typeface token. '
+ 'Valid tokens: #{map-keys($all-typeface-tokens)} ';
}
@return $typeface-token;
}
/*
----------------------------------------
cap-height()
----------------------------------------
Get the cap height of a valid typeface
----------------------------------------
*/
@function cap-height($typeface-token) {
@if not $typeface-token {
@return false;
}
$typeface-token: validate-typeface-token($typeface-token);
$token-data: map-get($all-typeface-tokens, $typeface-token);
@return map-get($token-data, "cap-height");
}
/*
----------------------------------------
px-to-rem()
----------------------------------------
Converts a value in px to a value in rem
----------------------------------------
*/
@function px-to-rem($pixels) {
@if not $pixels {
@return false;
}
$px-to-rem: ($pixels / $root-font-size-equiv) * 1rem;
$px-to-rem: round($px-to-rem * 100) / 100;
@return $px-to-rem;
}
/*
----------------------------------------
normalize-type-scale()
----------------------------------------
Normalizes a specific face's optical size
to a set target
----------------------------------------
*/
@function normalize-type-scale($cap-height, $scale) {
@if not $cap-height {
@return false;
}
$this-scale: $system-base-cap-height * strip-unit($scale) / $cap-height * 1px;
@return px-to-rem($this-scale);
}
/*
----------------------------------------
utility-font()
----------------------------------------
Get a normalized font-size in rem from
a family and a type size in either
system scale or project scale
----------------------------------------
Not the public-facing function.
Used for building the utilities and
withholds certain errors.
----------------------------------------
*/
@function utility-font($family, $scale) {
@if not map-has-key($project-cap-heights, $family) {
@error '#{$family} is not a valid font family token. '
+ 'Valid tokens: #{map-keys($project-cap-heights)}';
}
$quote-scale: smart-quote($scale);
@if not map-get($all-type-scale, $quote-scale) {
@error '`#{$scale}` is not a valid font scale token. '
+ 'Valid tokens: #{map-keys($all-type-scale)}';
}
$this-cap: map-get($project-cap-heights, $family);
$this-scale: map-get($all-type-scale, $quote-scale);
@if not $this-scale and $this-cap {
@return false;
}
@return normalize-type-scale($this-cap, $this-scale);
}
/*
----------------------------------------
line-height()
lh()
----------------------------------------
Get a normalized line-height from
a family and a line-height scale unit
----------------------------------------
*/
@function lh($props...) {
$props: unpack($props);
@if not length($props) == 2 {
@error 'lh() needs both a valid face and line height token '
+ 'in the format `lh(FACE, HEIGHT)`.';
}
$family: smart-quote(nth($props, 1));
$scale: smart-quote(nth($props, 2));
@if not map-has-key($project-cap-heights, $family) {
@error '#{$family} is not a valid font family token. '
+ 'Valid tokens: #{map-keys($project-cap-heights)}';
}
@if not map-get($system-line-height, $scale) {
@error '`#{$scale}` is not a valid line-height token. '
+ 'Valid tokens: #{map-keys($system-line-height)}';
}
@if not map-get($project-cap-heights, $family) {
@return false;
}
$this-cap: map-get($project-cap-heights, $family);
$this-line-height: map-get($system-line-height, $scale);
$normalized-line-height: $this-line-height /
($system-base-cap-height / $this-cap);
$normalized-line-height: round($normalized-line-height * 10) / 10;
@return $normalized-line-height;
}
@function line-height($props...) {
@return lh($props...);
}
/*
----------------------------------------
convert-to-font-type()
----------------------------------------
Converts a font-role token into a
font-type token. Leaves font-type tokens
unchanged.
----------------------------------------
*/
@function convert-to-font-type($token) {
@if map-has-key($project-font-role-tokens, $token) {
@return map-get($project-font-role-tokens, $token);
}
@return $token;
}
/*
----------------------------------------
get-font-stack()
----------------------------------------
Get a font stack from a style- or
role-based font token.
----------------------------------------
*/
@function get-font-stack($token) {
// Start by converting to a type token (sans, serif, etc)
$type-token: convert-to-font-type($token);
$output-display-name: true;
$this-stack: null;
// Get the font type metadata
$this-font-map: map-get($project-font-type-tokens, $type-token);
// Only output if the font type has an assigned typeface token
@if map-get($this-font-map, "typeface-token") {
$this-font-token: map-get($this-font-map, "typeface-token");
// Get the typeface metadata
$this-typeface-data: map-get($all-typeface-tokens, $this-font-token);
$this-name: map-get($this-typeface-data, "display-name");
// If it's a system typeface, don't output the display name
@if map-has-key($this-typeface-data, "system-font") {
$output-display-name: false;
}
// If there's a custom stack, use it and output the display name
@if map-get($this-font-map, "custom-stack") {
$this-stack: map-get($this-font-map, "custom-stack");
$output-display-name: true;
}
// Otherwise, just get the token's default stack
@else {
$this-stack: map-deep-get(
$all-typeface-tokens,
$this-font-token,
"stack"
);
}
// If the typeface has no display name (system fonts), don't output the display name
@if map-get($this-typeface-data, "display-name") == null {
$output-display-name: false;
}
@if not $output-display-name {
@return #{$this-stack};
}
@return #{$this-name}, #{$this-stack};
}
@return false;
}
/*
----------------------------------------
get-typeface-token()
----------------------------------------
Get a typeface token from a font-type or
font-role token.
----------------------------------------
*/
@function get-typeface-token($font-token) {
$this-token: $font-token;
@if map-has-key($project-font-role-tokens, $font-token) {
$this-token: map-get($project-font-role-tokens, $font-token);
}
@return map-deep-get(
$project-font-type-tokens,
$this-token,
"typeface-token"
);
}
/*
----------------------------------------
get-system-color()
----------------------------------------
Derive a system color from its
family, value, and vivid or a passed
variable that is, itself, a list
----------------------------------------
*/
@function get-system-color(
$color-family: false,
$color-grade: false,
$color-variant: false
) {
// If the arg being passed to the fn
// is a variable defined as a list,
// $color-family will contain this
// entire list, and needs to be
// unpacked.
// ex:
// in settings:
// $theme-color-primary.'dark': 'blue', 70
// in the theme colors map:
// $color-primary-dark: get-system-color($theme-color-primary.'dark'),
@if type-of($color-family) == "list" {
@if length($color-family) > 2 {
$color-variant: nth($color-family, 3);
}
$color-grade: nth($color-family, 2);
$color-family: nth($color-family, 1);
}
$color-family: smart-quote($color-family);
$color-variant: smart-quote($color-variant);
// If the arg being passed to the fn
// is false, it should output as `false`
// to preserve a false value in the
// target map
// ex:
// in settings:
// $theme-color-primary.'darkest': false;
// in the theme colors map:
// 'darkest': get-system-color($theme-color-primary.'darkest'),
// 'darkest': false, // is the desired outcome
// TODO: should a false-pass color function be a separate fn?
@if not $color-family {
@return false;
}
@if $color-variant {
$output: map-deep-get(
$system-colors,
$color-family,
$color-variant,
$color-grade
);
@return $output;
}
$output: map-deep-get($system-colors, $color-family, $color-grade);
@return $output;
}
/*
----------------------------------------
system-type-scale()
----------------------------------------
Get a value from the system type scale
----------------------------------------
*/
@function system-type-scale($scale) {
$scale: smart-quote($scale);
@if not $scale {
@return false;
}
@if not map-has-key($system-type-scale, $scale) {
@error '`#{$scale}` is not a valid type scale token. '
+ 'Valid tokens: #{map-keys($system-type-scale)}';
}
@return map-get($system-type-scale, $scale);
}
/*
----------------------------------------
calc-gap-offset()
----------------------------------------
Calculate a valid uswds unit that is
half the width of a given unit, for
calculating gap offset in the layout
grid.
----------------------------------------
*/
@function calc-gap-offset($gap-size) {
$gap-size: smart-quote($gap-size);
@if not map-has-key($spacing-to-value, $gap-size) {
@error '`#{$gap-size}` is not a valid USWDS gap size token.';
}
$numeric-eq: map-get($spacing-to-value, $gap-size);
$numeric-eq-half: inspect($numeric-eq / 2);
@if not map-has-key($spacing-to-token, $numeric-eq-half) {
@error '`#{$gap-size}` is not a valid USWDS gap size token. '
+ 'Column gaps need to have a standard size half their width.';
}
@return map-get($spacing-to-token, $numeric-eq-half);
}
/*
----------------------------------------
get-standard-values()
----------------------------------------
Gets a map of USWDS standard values
for a property
----------------------------------------
*/
@function get-standard-values($property) {
@return map-deep-get($system-properties, $property, standard);
}
/*
----------------------------------------
number-to-token()
----------------------------------------
Converts an integer or numeric value
into a system value
Ex: 0.5 --> '05'
-1px --> 'neg-1px'
----------------------------------------
*/
@function number-to-token($number) {
$number: inspect($number);
@if not map-has-key($number-to-value, $number) {
@return false;
}
@return map-get($number-to-value, $number);
}
/*
----------------------------------------
columns()
----------------------------------------
outputs a grid-col number based on
the number of desired columns in the
12-column grid
Ex: columns(2) --> 6
grid-col(columns(2))
----------------------------------------
*/
@function columns($number) {
$options: "auto", "fill";
$number: smart-quote($number);
@if index($options, $number) {
@return $number;
}
@if 12 % $number != 0 {
@error '`#{$number}` must be a divisor of 12.';
}
$columns: 12 / $number;
@return $columns;
}
/*
----------------------------------------
get-uswds-value()
----------------------------------------
Finds and outputs a value from the
USWDS standard values.
Used to build other standard utility
functions and mixins.
----------------------------------------
*/
@function get-uswds-value($property, $value...) {
@if type-of($value) == "arglist" and nth($value, 1) == override {
@return nth($value, 2);
}
$value: nth($value, 1);
$converted: number-to-token($value);
$quoted-value: if(
$converted,
smart-quote($converted),
smart-quote(nth($value, 1))
);
$our-standard-values: map-deep-get($system-properties, $property, standard);
$our-extended-values: map-deep-get($system-properties, $property, extended);
@if map-has-key($our-standard-values, $quoted-value) {
$output: map-get($our-standard-values, $quoted-value);
@if not $output {
@if $theme-show-compile-warnings {
@error '`#{$value}` is set as a `false` value '
+ 'for the #{$property} property in your project settings '
+ 'and will not output properly. '
+ 'Set the value of `#{$value}` in project settings.';
}
}
@return $output;
}
@if map-has-key($our-extended-values, $quoted-value) {
@if $theme-show-compile-warnings {
@warn '`#{$value}` is an extended USWDS `#{$property}` token. '
+ 'This is OK, but only components built with standard tokens can be accepted back into the system. '
+ 'Standard `#{$property}` values: #{map-keys($our-standard-values)}';
}
@return map-get($our-extended-values, $quoted-value);
}
// TODO: what are these last two cases? Evaluate.
@if not(type-of($value) == "number" and not unitless($value)) {
@error '`#{$value}` is not a valid `#{$property}` token. '
+ 'You should correct this. Standard `#{$property}` tokens: '
+ ' #{map-keys($our-standard-values)}';
}
@if $theme-show-compile-warnings {
@warn '`#{$value}` is not a USWDS `#{$property}` token. '
+ 'This is OK, but only components built with standard '
+ 'tokens can be accepted back into the system. '
+ 'Standard `#{$property}` values: #{map-keys($our-standard-values)}';
}
@return $value;
}
/*
----------------------------------------
color()
----------------------------------------
Derive a color from a color shortcode
----------------------------------------
*/
@function color($value, $flags...) {
$value: unpack($value);
// Non-token colors may be passed with specific flags
@if type-of($value) == color {
// override or set-theme will allow any color
@if index($flags, override) or index($flags, set-theme) {
// override + no-warn will skip warnings
@if index($flags, no-warn) {
@return $value;
}
@if $theme-show-compile-warnings {
@warn 'Override: `#{$value}` is not a USWDS color token.';
}
@return $value;
}
}
// False values may be passed through when setting theme colors
@if $value == false {
@if index($flags, set-theme) {
@return $value;
}
}
// Now, any value should be evaluated as a token
$value: smart-quote($value);
@if map-has-key($system-color-shortcodes, $value) {
$our-color: map-get($system-color-shortcodes, $value);
@if $our-color == false {
@error '`#{$value}` is a color that does not exist '
+ 'or is set to false.';
}
@return $our-color;
}
// If we're using the theme flag, $project-color-shortcodes has not yet been set
@if not index($flags, set-theme) {
@if map-has-key($project-color-shortcodes, $value) {
$our-color: (map-get($project-color-shortcodes, $value));
@if $our-color == false {
@error '`#{$value}` is a color that does not exist '
+ 'or is set to false.';
}
@return $our-color;
}
}
@error '`#{$value}` is not a valid USWDS color token. '
+ 'See designsystem.digital.gov/design-tokens/color '
+ 'for more information.';
}
/*
----------------------------------------
advanced-color()
----------------------------------------
Derive a color from a color triplet:
[family], [grade], [variant]
----------------------------------------
*/
// color() can have a 1, 2, or 3 arguments passed to it:
//
// [family]
// ex: color('primary')
// - the default in a theme palette family
//
// [family], [grade]
// ex: color('red', 50)
// - a standard system color
// ex: color('accent-warm', 'light')
// - a standard theme color
// ex: color('primary', 'vivid')
// - in theme colors, 'vivid' is considered a grade
//
// [family], [grade], [vivid]
// ex: color('red', 50, 'vivid')
// - a vivid system color
// - only system colors required three arguments
@function advanced-color(
$color-family: false,
$color-grade: false,
$color-variant: false
) {
// Convert any arglists into lists
$color-family: if(
type-of($color-family) == "arglist",
unpack($color-family),
$color-family
);
// If $color-family is a list, color() had a variable