# frozen_string_literal: true # :markup: markdown require "stringio" module Prism class ParseResult < Result # An object to represent the set of errors on a parse result. This object # can be used to format the errors in a human-readable way. class Errors # The parse result that contains the errors. attr_reader :parse_result # Initialize a new set of errors from the given parse result. def initialize(parse_result) @parse_result = parse_result end # Formats the errors in a human-readable way and return them as a string. def format error_lines = {} #: Hash[Integer, Array[ParseError]] parse_result.errors.each do |error| location = error.location (location.start_line..location.end_line).each do |line| error_lines[line] ||= [] error_lines[line] << error end end source_lines = parse_result.source.source.lines source_lines << "" if error_lines.key?(source_lines.size + 1) io = StringIO.new source_lines.each.with_index(1) do |line, line_number| io.puts(line) (error_lines.delete(line_number) || []).each do |error| location = error.location case line_number when location.start_line io.print(" " * location.start_column + "^") if location.start_line == location.end_line if location.start_column != location.end_column io.print("~" * (location.end_column - location.start_column - 1)) end io.puts(" " + error.message) else io.puts("~" * (line.bytesize - location.start_column)) end when location.end_line io.puts("~" * location.end_column + " " + error.message) else io.puts("~" * line.bytesize) end end end io.puts io.string end end end end