def on_slim_interpolate(string)
      # Interpolate variables in text (#{variable}).
      # Split the text into multiple dynamic and static parts.
      block = [:multi]
      begin
        case string
        when /\A\\#\{/
          # Escaped interpolation
          block << [:static, '#{']
          string = $'
        when /\A#\{((?>[^{}]|(\{(?>[^{}]|\g<1>)*\}))*)\}/
          # Interpolation
          string, code = $', $1
          escape = code !~ /\A\{.*\}\Z/
          block << [:slim, :output, escape, escape ? code : code[1..-2], [:multi]]
        when /\A([#\\]?[^#\\]*([#\\][^\\#\{][^#\\]*)*)/
          # Static text
          block << [:static, $&]
          string = $'
        end
      end until string.empty?
      block
    end
def on_slim_interpolate(string)
      # Interpolate variables in text (#{variable}).
      # Split the text into multiple dynamic and static parts.
      block = [:multi]
      begin
        case string
        when /\A\\#\{/
          # Escaped interpolation
          block << [:static, '#{']
          string = $'
        when /\A#\{((?>[^{}]|(\{(?>[^{}]|\g<1>)*\}))*)\}/
          # Interpolation
          string, code = $', $1
          escape = code !~ /\A\{.*\}\Z/
          block << [:slim, :output, escape, escape ? code : code[1..-2], [:multi]]
        when /\A([#\\]?[^#\\]*([#\\][^\\#\{][^#\\]*)*)/
          # Static text
          block << [:static, $&]
          string = $'
        end
      end until string.empty?
      block
    end
Handle interpolate expression `[:slim, :interpolate, string]`

 @param [String] string Static interpolate
 @return [Array] Compiled temple expression