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SassMeister-input.scss

// ----
// libsass (v3.2.4)
// ----

//     _            _           _                           _ _       
//    (_)          | |         | |                         | (_)      
//     _ _ __   ___| |_   _  __| | ___   _ __ ___   ___  __| |_  __ _ 
//    | | '_ \ / __| | | | |/ _` |/ _ \ | '_ ` _ \ / _ \/ _` | |/ _` |
//    | | | | | (__| | |_| | (_| |  __/ | | | | | |  __/ (_| | | (_| |
//    |_|_| |_|\___|_|\__,_|\__,_|\___| |_| |_| |_|\___|\__,_|_|\__,_|
//
//      Simple, elegant and maintainable media queries in Sass
//
//             http://include-media.com
//
//         Author: Eduardo Boucas <mail@eduardoboucas.com>
//


////
/// include-media library public configuration
/// @author Eduardo Boucas
/// @access public
////


///
/// Creates a list of global breakpoints
///
/// @example scss - Creates a single breakpoint with the label `phone`
///  $breakpoints: ('phone': 320px);
///
$breakpoints: (
  'phone': 320px,
  'tablet': 768px,
  'desktop': 1024px
) !default;


///
/// Creates a list of static expressions or media types
///
/// @example scss - Creates a single media type (screen)
///  $media-expressions: ('screen': 'screen');
///
/// @example scss - Creates a static expression with logical disjunction (OR operator)
///  $media-expressions: (
///    'retina2x': (
///      '(-webkit-min-device-pixel-ratio: 2)',
///      '(min-resolution: 192dpi)'
///    )
///  );
///
$media-expressions: (
  'screen': 'screen',
  'print': 'print',
  'handheld': 'handheld',
  'landscape': '(orientation: landscape)',
  'portrait': '(orientation: portrait)',
  'retina2x': (
    '(-webkit-min-device-pixel-ratio: 2)',
    '(min-resolution: 192dpi)'
  ), 
  'retina3x': (
    '(-webkit-min-device-pixel-ratio: 3)',
    '(min-resolution: 350dpi)'
  )
) !default;


///
/// Defines a number to be added or subtracted from each unit when declaring breakpoints with exclusive intervals
///
/// @example scss - Interval for pixels is defined as `1` by default
///  @include media(">128px") {}
///
///   /* Generates: */
///   @media (min-width: 129px) {}
///
/// @example scss - Interval for ems is defined as `0.01` by default
///  @include media(">20em") {}
///
///   /* Generates: */
///   @media (min-width: 20.01em) {}
///
/// @example scss - Interval for rems is defined as `0.1` by default, to be used with `font-size: 62.5%;`
///  @include media(">2.0rem") {}
///
///   /* Generates: */
///   @media (min-width: 2.1rem) {}
///
$unit-intervals: (
  'px': 1,
  'em': 0.01,
  'rem': 0.1
) !default;

////
/// Cross-engine logging engine
/// @author Hugo Giraudel
/// @access private
////


///
/// Log a message either with `@error` if supported 
/// else with `@warn`, using `function-exists('at-error')`
/// to detect support.
/// 
/// @param {String} $message - Message to log
///
@function log($message) {
  @if function-exists('at-error') {
    @error $message;
  } @else {
    @warn $message;
    $_: noop();
  }

  @return $message;
}


/// 
/// Wrapper mixin for the log function so it can be used with a more friendly
/// API than `@if log('..') {}` or `$_: log('..')`. Basically, use the function
/// within functions because it is not possible to include a mixin in a function
/// and use the mixin everywhere else because it's much more elegant.
///
/// @param {String} $message - Message to log
///
@mixin log($message) {
  @if log($message) {}
}


///
/// Function with no `@return` called next to `@warn` in Sass 3.3
/// to trigger a compiling error and stop the process.
///
@function noop() {}

////
/// Parsing engine
/// @author Hugo Giraudel
/// @access private
////


///
/// Get operator of an expression
///
/// @param {String} $expression - Expression to extract operator from
///
/// @return {String} - Any of `>=`, `>`, `<=`, `<`, `≥`, `≤`
///
@function get-expression-operator($expression) {
  @each $operator in ('>=', '>', '<=', '<', '≥', '≤') {
    @if str-index($expression, $operator) {
      @return $operator;
    }
  }

  // It is not possible to include a mixin inside a function, so we have to
  // rely on the `log(..)` function rather than the `log(..)` mixin. Because
  // functions cannot be called anywhere in Sass, we need to hack the call in
  // a dummy variable, such as `$_`. If anybody ever raise a scoping issue with
  // Sass 3.3, change this line in `@if log(..) {}` instead.
  $_: log('No operator found in `#{$expression}`.');
}


///
/// Get dimension of an expression, based on a found operator
///
/// @param {String} $expression - Expression to extract dimension from
/// @param {String} $operator - Operator from `$expression`
///
/// @return {String} - `width` or `height` (or potentially anything else)
///
@function get-expression-dimension($expression, $operator) {
  $operator-index: str-index($expression, $operator);
  $parsed-dimension: str-slice($expression, 0, $operator-index - 1);
  $dimension: 'width';

  @if str-length($parsed-dimension) > 0 {
    $dimension: $parsed-dimension;
  }

  @return $dimension;
}


///
/// Get dimension prefix based on an operator
///
/// @param {String} $operator - Operator
///
/// @return {String} - `min` or `max`
///
@function get-expression-prefix($operator) {
  @return if(index(('<', '<=', '≤'), $operator), 'max', 'min');
}


///
/// Get value of an expression, based on a found operator
///
/// @param {String} $expression - Expression to extract value from
/// @param {String} $operator - Operator from `$expression`
///
/// @return {Number} - A numeric value 
///
@function get-expression-value($expression, $operator) {
  $operator-index: str-index($expression, $operator);
  $value: str-slice($expression, $operator-index + str-length($operator));

  @if map-has-key($breakpoints, $value) {
    $value: map-get($breakpoints, $value);
  } @else {
    $value: to-number($value);
  }

  $interval: map-get($unit-intervals, unit($value));

  @if not $interval {
    // It is not possible to include a mixin inside a function, so we have to
    // rely on the `log(..)` function rather than the `log(..)` mixin. Because
    // functions cannot be called anywhere in Sass, we need to hack the call in
    // a dummy variable, such as `$_`. If anybody ever raise a scoping issue with
    // Sass 3.3, change this line in `@if log(..) {}` instead.
    $_: log('Unknown unit `#{unit($value)}`.');
  }

  @if $operator == '>' {
    $value: $value + $interval;
  } @else if $operator == '<' {
    $value: $value - $interval;
  }

  @return $value;
}


///
/// Parse an expression to return a valid media-query expression
///
/// @param {String} $expression - Expression to parse
///
/// @return {String} - Valid media query
///
@function parse-expression($expression) {
  // If it is part of $media-expressions, it has no operator
  // then there is no need to go any further, just return the value
  @if map-has-key($media-expressions, $expression) {
    @return map-get($media-expressions, $expression);
  }

  $operator: get-expression-operator($expression);
  $dimension: get-expression-dimension($expression, $operator);
  $prefix: get-expression-prefix($operator);
  $value: get-expression-value($expression, $operator);

  @return '(#{$prefix}-#{$dimension}: #{$value})';
}

///
/// Slice `$list` between `$start` and `$end` indexes
///
/// @access private
///
/// @param {List} $list - List to slice
/// @param {Number} $start [1] - Start index
/// @param {Number} $end [length($list)] - End index
///
/// @return {List} Sliced list
///
@function slice($list, $start: 1, $end: length($list)) {
  @if length($list) < 1 or $start > $end {
    @return ();
  }

  $result: ();

  @for $i from $start through $end {
    $result: append($result, nth($list, $i));
  }

  @return $result;
}

////
/// String to number converter
/// @author Hugo Giraudel
/// @access private
////


///
/// Casts a string into a number
///
/// @param {String | Number} $value - Value to be parsed
///
/// @return {Number}
///
@function to-number($value) {
  @if type-of($value) == 'number' {
    @return $value;
  } @else if type-of($value) != 'string' {
    $_: log('Value for `to-number` should be a number or a string.');
  }
  
  $result: 0;
  $digits: 0;
  $minus: str-slice($value, 1, 1) == '-';
  $numbers: ('0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9);
  
  @for $i from if($minus, 2, 1) through str-length($value) {
    $character: str-slice($value, $i, $i);
    
    @if not (index(map-keys($numbers), $character) or $character == '.') {
      @return to-length(if($minus, -$result, $result), str-slice($value, $i))
    }
    
    @if $character == '.' {
      $digits: 1; 
    } @else if $digits == 0 {
      $result: $result * 10 + map-get($numbers, $character);  
    } @else {
      $digits: $digits * 10;
      $result: $result + map-get($numbers, $character) / $digits;
    }
  }
  
  @return if($minus, -$result, $result);;
}


///
/// Add `$unit` to `$value`
///
/// @param {Number} $value - Value to add unit to
/// @param {String} $unit - String representation of the unit
///
/// @return {Number} - `$value` expressed in `$unit`
///
@function to-length($value, $unit) {
  $units: ('px': 1px, 'cm': 1cm, 'mm': 1mm, '%': 1%, 'ch': 1ch, 'pc': 1pc, 'in': 1in, 'em': 1em, 'rem': 1rem, 'pt': 1pt, 'ex': 1ex, 'vw': 1vw, 'vh': 1vh, 'vmin': 1vmin, 'vmax': 1vmax);
  
  @if not index(map-keys($units), $unit) {
    $_: log('Invalid unit `#{$unit}`.');
  }
  
  @return $value * map-get($units, $unit);
}

////
/// include-media public exposed API
/// @author Eduardo Boucas
/// @access public
////


///
/// Generates a media query based on a list of conditions
///
/// @param {Arglist}   $conditions  - Media query conditions
///
/// @example scss - With a single set breakpoint
///  @include media(">phone") { }
///
/// @example scss - With two set breakpoints
///  @include media(">phone", "<=tablet") { } 
///
/// @example scss - With custom values
///  @include media(">=358px", "<850px") { } 
///
/// @example scss - With set breakpoints with custom values
///  @include media(">desktop", "<=1350px") { } 
///
/// @example scss - With a static expression
///  @include media("retina2x") { } 
///
/// @example scss - Mixing everything
///  @include media(">=350px", "<tablet", "retina3x") { } 
///
@mixin media($conditions...) {
  @if length($conditions) == 0 {
    @content;
  } @else {
    @media #{unquote(parse-expression(nth($conditions, 1)))} {
      // Recursive call
      @include media(slice($conditions, 2)...) {
        @content;
      }
    }
  }
}

@include media('>=tablet', '<desktop', 'retina3x') {
  color: blue;
}

SassMeister-output.css

@media (min-width: 768px) and (max-width: 1023px) and (-webkit-min-device-pixel-ratio: 3) {
  color: blue;
}