Module: FakeFS::Globber

Extended by:
Globber
Included in:
Globber
Defined in:
lib/fakefs/globber.rb

Overview

Handles globbing for FakeFS.

Instance Method Summary collapse

Instance Method Details

#expand(pattern) ⇒ Object


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# File 'lib/fakefs/globber.rb', line 6

def expand(pattern)
  pattern = pattern.to_s

  return [pattern] if pattern[0] != '{' || pattern[-1] != '}'

  part = ''
  result = []

  each_char_with_levels pattern, '{', '}' do |chr, level|
    case level
    when 0
      case chr
      when '{'
        # noop
      else
        part << chr
      end
    when 1
      case chr
      when ','
        result << part
        part = ''
      when '}'
        # noop
      else
        part << chr
      end
    else
      part << chr
    end
  end

  result << part

  result
end

#path_components(pattern) ⇒ Object


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# File 'lib/fakefs/globber.rb', line 43

def path_components(pattern)
  pattern = pattern.to_s

  part = ''
  result = []

  each_char_with_levels pattern, '{', '}' do |chr, level|
    if level == 0 && chr == File::SEPARATOR
      result << part
      part = ''
    else
      part << chr
    end
  end

  result << part

  drop_root(result).reject(&:empty?)
end

#regexp(pattern) ⇒ Object


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# File 'lib/fakefs/globber.rb', line 63

def regexp(pattern)
  pattern = pattern.to_s

  regex_body = pattern.gsub('.', '\.')
                      .gsub('+') { '\+' }
                      .gsub('?', '.')
                      .gsub('*', '.*')
                      .gsub('(', '\(')
                      .gsub(')', '\)')
                      .gsub('$', '\$')

  # This matches nested braces and attempts to do something correct most of the time
  # There are known issues (i.e. {,*,*/*}) that cannot be resolved with out a total
  # refactoring
  loop do
    break unless regex_body.gsub!(/(?<re>\{(?:(?>[^{}]+)|\g<re>)*\})/) do
      "(#{Regexp.last_match[1][1..-2].gsub(',', '|')})"
    end
  end

  regex_body = regex_body.gsub(/\A\./, '(?!\.).')

  /\A#{regex_body}\Z/
end