Module: CSS::MediaQueries::Evaluator

Extended by:

Evaluator

Included in:

Evaluator

Defined in:

lib/css/media_queries/evaluator.rb

Overview

Evaluates a MediaQueryList against a Context, returning true if at least one media-query in the list matches.

Constant Summary

EM_PX =

Length conversion to CSS px assumes 1em = 1rem = 16px. Per Media Queries Level 4 §1.3 this is the conventional fallback when the font-size of the root is unknown.

16.0

LENGTH_UNITS_PX =

{
  'px'  => 1.0,
  'em'  => EM_PX,
  'rem' => EM_PX,
  'ex'  => EM_PX * 0.5,
  'ch'  => EM_PX * 0.5,
  'pt'  => 96.0 / 72,
  'pc'  => 16.0,
  'in'  => 96.0,
  'cm'  => 96.0 / 2.54,
  'mm'  => 96.0 / 25.4,
  'q'   => 96.0 / 25.4 / 4
}.freeze

RESOLUTION_UNITS_DPPX =

{
  'dppx' => 1.0,
  'x'    => 1.0,
  'dpi'  => 1.0 / 96,
  'dpcm' => 2.54 / 96
}.freeze

RESOLUTION_FEATURES =

%w[resolution].freeze

INVERSE_OP =

{lt: :gt, le: :ge, gt: :lt, ge: :le, eq: :eq}.freeze

PREFIX_OP =

{min: :ge, max: :le}.freeze

Instance Method Summary

• #evaluate(query_list, context) ⇒ Object

Instance Method Details

#evaluate(query_list, context) ⇒ Object

# File 'lib/css/media_queries/evaluator.rb', line 40

def evaluate(query_list, context)
  query_list.queries.any? { evaluate_query(it, context) }
end