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Contents
require 'ndr_support/utf8_encoding'
module NdrImport
module Xml
# A class to remove control characters, and XML entities representing them
class ControlCharEscaper
include UTF8Encoding
# Matches XML character reference entities
CHARACTER_REFERENCES = /&#(?:(?<decimal>\d+)|x(?<hex>\h+));/.freeze
attr_reader :data
def initialize(data)
@data = data
end
def escape!
unescape_control_char_references!(data)
escape_control_chars!(data)
end
private
def unescape_control_char_references!(data)
data.gsub!(CHARACTER_REFERENCES) do |reference|
char = try_to_extract_char_from(Regexp.last_match)
if char&.match?(CONTROL_CHARACTERS)
escape_control_chars!(char)
else
reference
end
end
end
def try_to_extract_char_from(match)
if match.nil?
nil
elsif match[:decimal]
match[:decimal].to_i(10).chr
elsif match[:hex]
match[:hex].to_i(16).chr
end
rescue RangeError
# Return everything if the match was against junk:
match.to_s
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems