def tabs
line = self
@tabs ||= precompiler.instance_eval do
break 0 if line.text.empty? || !(whitespace = line.full[/^\s+/])
if @indentation.nil?
@indentation = whitespace
if @indentation.include?(?\s) && @indentation.include?(?\t)
raise SyntaxError.new("Indentation can't use both tabs and spaces.", line.index)
end
@flat_spaces = @indentation * @template_tabs if flat?
break 1
end
tabs = whitespace.length / @indentation.length
break tabs if whitespace == @indentation * tabs
break @template_tabs if flat? && whitespace =~ /^#{@indentation * @template_tabs}/
raise SyntaxError.new("Inconsistent indentation: \#{Haml::Shared.human_indentation whitespace, true} used for indentation,\nbut the rest of the document was indented using \#{Haml::Shared.human_indentation @indentation}.\n".strip.gsub("\n", ' '), line.index)
end
end