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1
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# frozen_string_literal: true
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2
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3
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5
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require 'forwardable'
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4
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5
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5
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module Roadie
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6
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# @api private
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7
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# A style block is the combination of a {Selector} and a list of {StyleProperty}.
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8
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5
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class StyleBlock
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9
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extend Forwardable
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10
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5
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attr_reader :selector, :properties, :media
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11
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12
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# @param [Selector] selector
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13
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# @param [Array<StyleProperty>] properties
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14
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# @param [Array<String>] media Array of media types, e.g.
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15
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# @media screen, print and (max-width 800px) will become
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16
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# ['screen', 'print and (max-width 800px)']
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17
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def initialize(selector, properties, media)
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18
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@selector = selector
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19
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@properties = properties
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20
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@media = media.map(&:to_s)
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21
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end
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22
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23
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# @!method specificity
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24
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# @see Selector#specificity
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25
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5
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def_delegators :selector, :specificity
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26
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# @!method selector_string
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27
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# @see Selector#to_s
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28
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def_delegator :selector, :to_s, :selector_string
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29
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30
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# Checks whether the media query can be inlined
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31
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# @see inlineable_media
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32
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# @return {Boolean}
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33
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5
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def inlinable?
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34
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5
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inlinable_media? && selector.inlinable?
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35
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end
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36
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37
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# String representation of the style block. This is valid CSS and can be
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38
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# used in the DOM.
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39
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# @return {String}
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40
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5
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def to_s
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41
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# NB - leave off redundant final semicolon - see https://www.w3.org/TR/CSS2/syndata.html#declaration
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42
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5
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"#{selector}{#{properties.map(&:to_s).join(';')}}"
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43
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end
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44
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45
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5
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private
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46
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47
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# A media query cannot be inlined if it contains any advanced rules
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48
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# e.g. @media only screen {...} is ok to inline but
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49
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# @media only screen and (max-width: 600px) {...} cannot be inlined
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50
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# @return {Boolean}
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51
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5
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def inlinable_media?
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52
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5
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@media.none? { |media_query| media_query.include? '(' }
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53
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end
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54
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end
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55
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end
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kovalevsky