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- lib/compass/sass_extensions/functions/selectors.rb

### Methods

- #append_selector
- #headers
- #headings
- #nest

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# Compass::SassExtensions::Functions::Selectors

### Constants

COMMA_SEPARATOR

### Public Instance Methods

append_selector(selector, to_append) click to toggle source

Permute two selectors, the first may be comma delimited. The end result is a new selector that is the equivalent of nesting the second selector under the first one in a sass file and preceding it with an &. To illustrate, the following mixins are equivalent:

# mixin-a(!selector, !to_append)

    #{!selector}
      &#{!to_append}
        width: 2px

# mixin-b(!selector, !to_append)

    #{append_selector(!selector, !to_append)}
      width: 2px

    # File lib/compass/sass_extensions/functions/selectors.rb, line 35
    def append_selector(selector, to_append)
      ancestors = selector.value.split(COMMA_SEPARATOR)
      descendants = to_append.value.split(COMMA_SEPARATOR)
      nested = ancestors.map{|a| descendants.map{|d| "#{a}#{d}"}.join(", ")}.join(", ")
      Sass::Script::String.new(nested)
    end

headers(from = nil, to = nil) click to toggle source

Return the header selectors for the levels indicated Defaults to all headers h1 through h6 For example: headers(all) => h1, h2, h3, h4, h5, h6 headers(4) => h1, h2, h3, h4 headers(2,4) => h2, h3, h4

    # File lib/compass/sass_extensions/functions/selectors.rb, line 48
    def headers(from = nil, to = nil)
      if from && !to
        if from.is_a?(Sass::Script::String) && from.value == "all"
          from = Sass::Script::Number.new(1)
          to = Sass::Script::Number.new(6)
        else
          to = from
          from = Sass::Script::Number.new(1)
        end
      else
        from ||= Sass::Script::Number.new(1)
        to ||= Sass::Script::Number.new(6)
      end
      Sass::Script::String.new((from.value..to.value).map{|n| "h#{n}"}.join(", "))
    end

Also aliased as: headings
headings(from = nil, to = nil) click to toggle source
Alias for: headers
nest(*arguments) click to toggle source

Permute multiple selectors each of which may be comma delimited, the end result is a new selector that is the equivalent of nesting each under the previous selector. To illustrate, the following mixins are equivalent:

# mixin-a(!selector1, !selector2, !selector3)

    #{!selector1}
      #{selector2}
        #{selector3}
          width: 2px

# mixin-b(!selector1, !selector2)

    #{nest(!selector, !selector2, !selector3)}
      width: 2px

    # File lib/compass/sass_extensions/functions/selectors.rb, line 15
    def nest(*arguments)
      nested = arguments.map{|a| a.value}.inject do |memo,arg|
        ancestors = memo.split(COMMA_SEPARATOR)
        descendants = arg.split(COMMA_SEPARATOR)
        ancestors.map{|a| descendants.map{|d| "#{a} #{d}"}.join(", ")}.join(", ")
      end
      Sass::Script::String.new(nested)
    end

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