module IRB::MagicFile - Documentation for Ruby 3.2

# module IRB::MagicFile

### Constants

ENCODING_SPEC_RE

  see parser_magic_comment in parse.y

### Public Class Methods

open(path) { |io)| ... } click to toggle source

    # File lib/irb/magic-file.rb, line 7
    def open(path)
      io = File.open(path, 'rb')
      line = io.gets
      line = io.gets if line[0,2] == "#!"
      encoding = detect_encoding(line)
      internal_encoding = encoding
      encoding ||= IRB.default_src_encoding
      io.rewind
      io.set_encoding(encoding, internal_encoding)

      if block_given?
        begin
          return (yield io)
        ensure
          io.close
        end
      else
        return io
      end
    end

### Private Class Methods

detect_encoding(line) click to toggle source

    # File lib/irb/magic-file.rb, line 29
    def detect_encoding(line)
      return unless line[0] == ?#
      line = line[1..-1]
      line = $1 if line[/-\*-\s*(.*?)\s*-*-$/]
      return nil unless ENCODING_SPEC_RE =~ line
      encoding = $1
      return encoding.sub(/-(?:mac|dos|unix)/i, '')
    end