module FakeFS::Globber

Handles globbing for FakeFS.

Public Instance Methods

expand(pattern) click to toggle source
# 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) click to toggle source
# 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) click to toggle source
# 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

Private Instance Methods

drop_root(path_parts) click to toggle source
# File lib/fakefs/globber.rb, line 105
def drop_root(path_parts)
  # we need to remove parts from root dir at least for windows and jruby
  return path_parts if path_parts.nil? || path_parts.empty?
  root = RealFile.expand_path('/').split(File::SEPARATOR).first
  path_parts.shift if path_parts.first == root
  path_parts
end
each_char_with_levels(string, level_start, level_end) { |chr, level| ... } click to toggle source
# File lib/fakefs/globber.rb, line 90
def each_char_with_levels(string, level_start, level_end)
  level = 0

  string.each_char do |chr|
    yield chr, level

    case chr
    when level_start
      level += 1
    when level_end
      level -= 1
    end
  end
end