Perform interpolation of #{var_name} in the expressions `[:slim, :interpolate, string]`.
@api private
Handle interpolate expression `[:slim, :interpolate, string]`
@param [String] string Static interpolate @return [Array] Compiled temple expression
# File lib/slim/interpolation.rb, line 11 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 %r\A\\#\{/ # Escaped interpolation # Use [:slim, :output] because this is used by InterpolateTiltEngine # to filter out protected strings (Issue #141). block << [:slim, :output, false, '\#{\', [:multi]] string = $' when %r\A#\{/ # Interpolation string, code = parse_expression($') escape = code !~ %r\A\{.*\}\Z/ block << [:slim, :output, escape, escape ? code : code[1..-2], [:multi]] when %r\A([#\\]|[^#\\]*)/ # Static text block << [:static, $&] string = $' end end until string.empty? block end
# File lib/slim/interpolation.rb, line 39 def parse_expression(string) count, i = 1, 0 while i < string.size && count != 0 if string[i] == {{ count += 1 elsif string[i] == }} count -= 1 end i += 1 end raise "Text interpolation: Expected closing }" if count != 0 return string[i..-1], string[0, i-1] end