$n
count of errors received
$errors
list of error information
$verbose
boolean that determines of errors are printed when received
$has_no_errors()
helper method to determine if there are no errors
$has_any_errors()
helper method to determine if there are any errors
$get_sub_source(loc)
helper method to display a subsection of source text given Location information
$add(rule_code, ...)
add a new error according to the rule_code
provided. Remaining arguments are passed directly to paste(..., sep = "")
with extra error rule information
$.format(...)
formats the error list into user friendly text. Remaining arguments are ignored
$print(...)
prints the error list by calling self$format(...)