offset_source_tokens

# File actionview/lib/action_view/template/handlers/erb.rb, line 153
        def offset_source_tokens(source_tokens)
          source_offset = 0
          with_offset = source_tokens.filter_map do |(name, str)|
            result = [name, str, source_offset] if name == :CODE || name == :TEXT
            source_offset += str.bytesize
            result
          end
          with_offset << [:EOS, nil, source_offset]
        end