Module: Recls::Ximpl::Util

Defined in:
lib/recls/ximpl/util.rb

Class Method Summary collapse

Class Method Details

.append_trailing_slash(p, slash = nil) ⇒ Object

appends trailing slash to a path if not already present

dependencies: none



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# File 'lib/recls/ximpl/util.rb', line 86

def self.append_trailing_slash(p, slash = nil)

  return p if not p or p.empty?

  return p if self.is_path_name_separator(p[-1])

  slash = '/' if not slash

  "#{p}#{slash}"
end

.canonicalise_parts(parts, basename = nil) ⇒ Object

Returns a tuple consisting of:

f1. The canonicalised array of parts f2. A boolean indicating whether to ‘consume’ the basename

dependencies: OS.is_root_dir_, OS.get_number_of_dots_dir_,



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# File 'lib/recls/ximpl/util.rb', line 252

def self.canonicalise_parts(parts, basename = nil)

  newParts = []

  trailing_slash = parts.empty? ? nil : self.get_trailing_slash(parts[-1])

  lastSingleDots = nil

  path_is_rooted = nil

  index = -1
  parts.each do |part|

    index += 1

    next if not part
    next if part.empty?

    if path_is_rooted.nil?
      path_is_rooted = self.is_path_name_separator(part[0])
    end

    if ?. == part[0]
      if self.is_path_name_separator(part[1])
        # single dots, so ...

        # ... remember the last instance, and ...
        lastSingleDots = part

        # ... skip to leave this out of the result
        next
      elsif ?. == part[1]
        if self.is_path_name_separator(part[2])
          # double dots, so ...
          # ... skip this and pop prior from the new list iff:
          #
          # 1. there is a prior elements in the new list (size > 1); AND
          # 2. the last element in the new list is not the root directory; AND
          # 3. the last element in the list is not a dots directory
          if not newParts.empty? # 1.
            priorPart = newParts[-1]
            if 1 == newParts.size and OS.is_root_dir_(priorPart)
              # 2.
              next
            else
              dirtype = OS.get_number_of_dots_dir_(priorPart)
              if 0 == dirtype # 3.
                if newParts.pop
                  next
                end
              end
            end
          end
        else
          # it's a ..X part
        end
      else
        # it's a .X part
      end
    else
      # it's a non-dots part
    end

    newParts << part
  end

  consume_basename = false

  if basename
    if ?. == basename[0]
      if 1 == basename.size
        # single dots
        if newParts.empty?
          lastSingleDots = false
        else
          consume_basename = true
        end
      elsif ?. == basename[1] and 2 == basename.size
        # double dots, so ...
        #
        # ... pop unless we already have some outstanding double dots
        if newParts.empty?
          newParts << '..'
          consume_basename = true
        elsif 1 == newParts.size && 1 == newParts[0].size && Util.is_path_name_separator(newParts[0][0])
          consume_basename = true
        else
          if 2 != OS.get_number_of_dots_dir_(newParts[-1])
            newParts.pop
            consume_basename = true
          end
        end
      end
    end
  end

  # push lastSingleDots (which may contain a trailing slash) if
  # exists and newParts is empty
  newParts << lastSingleDots if lastSingleDots and newParts.empty?

  if not newParts.empty?
    if 2 == OS.get_number_of_dots_dir_(newParts[-1])
      # the last element is the double-dots directory, but
      # need to determine whether to ensure/remote a
      # trailing slash
      if basename and not basename.empty?
        if not consume_basename
          # leave as is
        else
          # 
          newParts[-1] = '..'
        end
      end
    end
  else
    # handle case where all (double)-dots have eliminated
    # all regular directories
    if not basename or basename.empty? or consume_basename
      newParts << '.'
    end
  end

  [ newParts.join(''), consume_basename ]
end

.get_trailing_slash(p, args = {}) ⇒ Object

returns the trailing slash, or nil if none present

dependencies: none



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# File 'lib/recls/ximpl/util.rb', line 74

def self.get_trailing_slash(p, args = {})

  return nil if p.nil?
  return nil if p.empty?

  return self.is_path_name_separator(p[-1]) ? p[-1] : nil
end

.get_windows_root(p) ⇒ Object

From path p, returns a tuple containing either:

[ nil, p ] if p does not contain a Windows root, or

[ wroot, remainder ] if p does contain a Windows root, or

[ nil, nil ] if p is nil

dependencies: none



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# File 'lib/recls/ximpl/util.rb', line 119

def self.get_windows_root(p)

  return [ nil, nil ] if not p

  if Recls::Ximpl::OS::OS_IS_WINDOWS

    # Windows local drive (e.g. 'H:')
    #
    # NOTE: this works for both rooted and unrooted paths
    if p =~ /^([a-zA-Z]:)/
      return [ $1, $' ]
    end

    # UNC network drive
    #
    # NOTE: there are several permutations ...
    if p =~ /^(\\\\[^\\\/:*?<>|]+\\[^\\\/:*?<>|]+)([\\\/].*)$/
      # \\server\share{\{... rest of path}}
      return [ $1, $2 ]
    end
    if p =~ /^(\\\\[^\\\/:*?<>|]+\\[^\\\/:*?<>|]+)$/
      # \\server\share
      return [ $1, nil ]
    end
    if p =~ /^(\\\\[^\\\/:*?<>|]+\\)$/
      # \\server       return [ $1, nil ]
    end
    if p =~ /^(\\\\[^\\\/:*?<>|]+)$/
      # \\server
      return [ $1, nil ]
    end
  end

  return [ nil, p ]
end

.has_trailing_slash(p) ⇒ Object

Indicates whether a trailing slash is on the given path

dependencies: none



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# File 'lib/recls/ximpl/util.rb', line 64

def self.has_trailing_slash(p)

  return p if p.nil? or p.empty?

  return self.is_path_name_separator(p[-1])
end

.is_path_name_separator(c) ⇒ Object 



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# File 'lib/recls/ximpl/util.rb', line 50

def self.is_path_name_separator(c)

  return true if ?/ == c

  if Recls::Ximpl::OS::OS_IS_WINDOWS
    return true if ?\\ == c
  end

  return false
end

.path_parts(path) ⇒ Object

obtains the parts from a path, including any Windows root and the file basename



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# File 'lib/recls/ximpl/util.rb', line 158

def self.path_parts(path)

  return nil if path.nil?
  return [] if path.empty?

  parts = []

  wr, rem =  self.get_windows_root(path)

  parts << wr if wr

  until rem.nil? || rem.empty?
    if rem =~ /^([^\\\/]*[\\\/])/
      parts << $1
      rem = $'
    else
      parts << rem
      rem = ''
    end
  end

  parts
end

.split_path(p) ⇒ Object

Returns a tuple consisting of the following elements (or nil, for any element that is not) present

f1. Windows root, or nil f2. directory, or nil f3. basename, or nil f4. basename-minus-extension, or nil f5. extension, or nil f6. array of directory path parts, which may be empty (not nil) f7. array of all path parts, which may be empty (not nil)

dependencies: Util.path_parts, Util.get_windows_root



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# File 'lib/recls/ximpl/util.rb', line 195

def self.split_path(p)

  f1_windows_root, remainder = self.get_windows_root p
  f1_windows_root = nil if not f1_windows_root or f1_windows_root.empty?
  remainder = nil if not remainder or remainder.empty?

  if not remainder or remainder.empty?
    f2_directory = nil
    f3_basename = nil
    f4_nameonly = nil
    f5_extension = nil
  else
    if remainder =~ /^(.*[\\\/])([^\\\/]*)$/
      f2_directory = $1
      f3_basename = $2
    else
      f2_directory = nil
      f3_basename = remainder
      f4_nameonly = nil
      f5_extension = nil
    end

    f2_directory = nil if not f2_directory or f2_directory.empty?
    f3_basename = nil if not f3_basename or f3_basename.empty?

    if f3_basename
      # special case: treat '.' and '..' as file-name only
      if '.' == f3_basename or '..' == f3_basename
        f4_nameonly = f3_basename
        f5_extension = nil
      elsif f3_basename =~ /^(.*)(\.[^.]*)$/
        f4_nameonly = $1
        f5_extension = $2
      else
        f4_nameonly = f3_basename
        f5_extension = nil
      end
    else
      f4_nameonly = nil
      f5_extension = nil
    end
  end

  f4_nameonly = nil if not f4_nameonly or f4_nameonly.empty?
  f5_extension = nil if not f5_extension or f5_extension.empty?
  f6_directory_parts = self.path_parts(f2_directory)
  f7_path_parts = self.path_parts(p)

  return [ f1_windows_root, f2_directory, f3_basename, f4_nameonly, f5_extension, f6_directory_parts, f7_path_parts ]
end

.trim_trailing_slash(p) ⇒ Object

trims trailing slash from a path, unless it is the root

dependencies: none



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# File 'lib/recls/ximpl/util.rb', line 101

def self.trim_trailing_slash(p)

  return p if not p or p.empty?

  p = p[0 ... -1] if self.is_path_name_separator(p[-1])

  return p
end