# frozen_string_literal: true

# The MIT License (MIT)
#
# Copyright (c) 2019 NUM Technology Ltd
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

module MODL
  module Parser
    # Escape-sequence replacements for MODL files.
    class Substitutions

      @@subs = [
          ['~\\', '\\'],
          ['\\\\', '\\'],
          ['~~', '~'],
          ['\\~', '~'],
          ['~(', '('],
          ['\\(', '('],
          ['~)', ')'],
          ['\\)', ')'],
          ['~[', '['],
          ['\\[', '['],
          ['~]', ']'],
          ['\\]', ']'],
          ['~{', '{'],
          ['\\{', '{'],
          ['~}', '}'],
          ['\\}', '}'],
          ['~;', ';'],
          ['\\;', ';'],
          ['~:', ':'],
          ['\\:', ':'],
          ['~`', '`'],
          ['\\`', '`'],
          ['~"', '"'],
          ['\\"', '"'],
          ['~=', '='],
          ['\\=', '='],
          ['~/', '/'],
          ['\\/', '/'],
          ['<', '<'],
          ['\\<', '<'],
          ['~>', '>'],
          ['\\>', '>'],
          ['~&', '&'],
          ['\\&', '&'],
          ['!', '!'],
          ['\\!', '!'],
          ['~|', '|'],
          ['\\|', '|'],
          ['\\t', "\t"],
          ['\\n', "\n"],
          ['\\b', "\b"],
          ['\\f', "\f"],
          ['\\r', "\r"]
      ]

      # Replace all escape sequences in the supplied string and return the new value.
      def self.process(str)
        return str unless str.is_a? String
        @@subs.each do |s|
          loop do
            prev = str
            str = str.sub(s[0], s[1])
            break unless str && str != prev
          end
        end
        str
      end
    end
  end
end