Class: Yast::PunycodeClass

Inherits:
Module
  • Object
show all
Defined in:
library/types/src/modules/Punycode.rb

Constant Summary collapse

NOT_CACHED_REGEXP =

string, matching this regexp, is not cached

/^[0123456789.]*$/.freeze

Instance Method Summary collapse

Instance Method Details

#ConvertBackAndForth(strings_in, to_punycode) ⇒ Object

Function takes the list of strings and returns them in the converted format. Unicode to Punycode or Punycode to Unicode (param to_punycode). It uses a cache of already-converted strings.


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# File 'library/types/src/modules/Punycode.rb', line 178

def ConvertBackAndForth(strings_in, to_punycode)
  # Some (or maybe all) strings needn't be cached
  not_cached = []

  # Check the cache for already entered strings
  test_cached = strings_in.each_with_object({}) do |string_in, all|
    # Numbers, IPs and empty strings are not converted
    string_out =
      if NOT_CACHED_REGEXP.match?(string_in)
        string_in
      elsif to_punycode
        GetEncodedCachedString(string_in)
      else
        GetDecodedCachedString(string_in)
      end

    not_cached << string_in if string_out.nil?
    all[string_in] = string_out
  end

  converted_not_cached = []

  # There is something not cached, converting them at once
  if !not_cached.empty?
    meth = to_punycode ? :to_ascii : :to_unicode
    converted_not_cached = not_cached.map { |v| SimpleIDN.public_send(meth, v) }
  end

  # Listing through the given list and adjusting the return list
  found_index = -1
  strings_in.each_with_object([]) do |string_in, all|
    # Already cached string
    if test_cached[string_in]
      all << test_cached[string_in]
    else # Recently converted strings
      found_index += 1
      all << converted_not_cached[found_index] || ""

      # Adding converted strings to cache
      if to_punycode
        CreateNewCacheRecord(string_in, converted_not_cached[found_index] || "")
      else
        CreateNewCacheRecord(converted_not_cached[found_index] || "", string_in)
      end
    end
  end
end

#CreateNewCacheRecord(decoded, encoded) ⇒ Object

Adds new cache records for encoded and decoded strings.


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# File 'library/types/src/modules/Punycode.rb', line 88

def CreateNewCacheRecord(decoded, encoded)
  # Erroneous cache record
  return if decoded.nil? || encoded.nil?

  # Already cached
  return if Builtins.contains(@cache_decoded, decoded)

  decoded_size = Builtins.size(decoded)
  encoded_size = Builtins.size(encoded)

  # Do not store this record if the cache would exceed maximum
  if Ops.greater_than(
    Ops.add(Ops.add(@current_cache_size, decoded_size), encoded_size),
    @maximum_cache_size
  )
    return
  end

  @current_cache_size = Ops.add(
    Ops.add(@current_cache_size, decoded_size),
    encoded_size
  )
  Ops.set(@cache_decoded, @current_cache_index, decoded)
  Ops.set(@cache_encoded, @current_cache_index, encoded)
  @current_cache_index = Ops.add(@current_cache_index, 1)

  nil
end

#DecodeDomainName(encoded_domain_name) ⇒ String

Decodes the domain name (relative or FQDN) from the Punycode.

Examples:

DecodeDomainName("xn--ala-qma83eb.xn--jlinka-3mb.go.home")
  -> "žížala.jůlinka.go.home"

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# File 'library/types/src/modules/Punycode.rb', line 269

def DecodeDomainName(encoded_domain_name)
  Builtins.mergestring(
    DecodePunycodes(Builtins.splitstring(encoded_domain_name, ".")),
    "."
  )
end

#DecodePunycodes(punycode_strings) ⇒ Array<String>

Converts list of Punycode strings into their UTF-8 representation.


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# File 'library/types/src/modules/Punycode.rb', line 241

def DecodePunycodes(punycode_strings)
  punycode_strings = deep_copy(punycode_strings)
  ConvertBackAndForth(punycode_strings, false)
end

#DocodeDomainNames(encoded_domain_names) ⇒ Array<String>

Decodes the list of domain names to their Unicode representation. This function is similar to DecodePunycodes but it works with every string as a domain name (that means every domain name is parsed by dots and separately evaluated).

Examples:

DocodeDomainNames(["mx1.example.org", "xp3.example.org.", "xn--ala-qma83eb.org.example."])
 -> ["mx1.example.org", "xp3.example.org.", "žížala.org.example."]

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# File 'library/types/src/modules/Punycode.rb', line 287

def DocodeDomainNames(encoded_domain_names)
  encoded_domain_names = deep_copy(encoded_domain_names)
  decoded_domain_names = []
  strings_to_decode = []

  # $[0 : [0, 2], 1 : [3, 5]]
  backward_map_of_conversion = {}

  current_domain_index = -1
  current_domain_item = 0

  # parsing all domain names one by one
  Builtins.foreach(encoded_domain_names) do |one_domain_name|
    current_domain_index = Ops.add(current_domain_index, 1)
    start = current_domain_item    # parsing the domain name by dots

    Builtins.foreach(Builtins.splitstring(one_domain_name, ".")) do |domain_item|
      Ops.set(strings_to_decode, current_domain_item, domain_item)
      current_domain_item = Ops.add(current_domain_item, 1)
    end    # creating backward index

    Ops.set(
      backward_map_of_conversion,
      current_domain_index,
      [start, Ops.subtract(current_domain_item, 1)]
    )
  end

  # Transformating strings to the decoded format
  strings_to_decode = DecodePunycodes(strings_to_decode)

  current_domain_index = -1
  Builtins.foreach(encoded_domain_names) do |one_encoded|
    current_domain_index = Ops.add(current_domain_index, 1)    # Where the current string starts and ends

    current = Ops.get(backward_map_of_conversion, [current_domain_index, 0])
    end_ = Ops.get(backward_map_of_conversion, [current_domain_index, 1])    # error?

    if current.nil? || end_.nil?
      Builtins.y2error(
        "Cannot find start/end for %1 in %2",
        one_encoded,
        Ops.get(backward_map_of_conversion, current_domain_index)
      )
      Ops.set(decoded_domain_names, current_domain_index, one_encoded)
    else
      # create a list of items of the current domain (translated)
      decoded_domain = []
      while Ops.less_or_equal(current, end_)
        decoded_domain = Builtins.add(
          decoded_domain,
          Ops.get(strings_to_decode, current, "")
        )
        current = Ops.add(current, 1)
      end      # create a domain name from these strings

      Ops.set(
        decoded_domain_names,
        current_domain_index,
        Builtins.mergestring(decoded_domain, ".")
      )
    end
  end

  deep_copy(decoded_domain_names)
end

#EncodeDomainName(decoded_domain_name) ⇒ String

Encodes the domain name (relative or FQDN) to the Punycode.

Examples:

EncodeDomainName("žížala.jůlinka.go.home")
  -> "xn--ala-qma83eb.xn--jlinka-3mb.go.home"

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# File 'library/types/src/modules/Punycode.rb', line 254

def EncodeDomainName(decoded_domain_name)
  Builtins.mergestring(
    EncodePunycodes(Builtins.splitstring(decoded_domain_name, ".")),
    "."
  )
end

#EncodePunycodes(punycode_strings) ⇒ Array<String>

Converts list of UTF-8 strings into their Punycode ASCII repserentation.


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# File 'library/types/src/modules/Punycode.rb', line 231

def EncodePunycodes(punycode_strings)
  punycode_strings = deep_copy(punycode_strings)
  ConvertBackAndForth(punycode_strings, true)
end

#GetDecodedCachedString(encoded_string) ⇒ String

Returns string encoded in Punycode if it has been already cached. Returns nil if not found.


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# File 'library/types/src/modules/Punycode.rb', line 147

def GetDecodedCachedString(encoded_string)
  ret = nil

  # numbers and empty strings are not converted
  return encoded_string if NOT_CACHED_REGEXP.match?(encoded_string)

  counter = -1  # searching through encoded strings to find the index

  Builtins.foreach(@cache_encoded) do |cached_string|
    counter = Ops.add(counter, 1)
    if cached_string == encoded_string      # returning decoded representation

      ret = Ops.get(@cache_decoded, counter)
      raise Break
    end
  end

  ret
end

#GetEncodedCachedString(decoded_string) ⇒ String

Returns string encoded in Punycode if it has been already cached. Returns nil if not found.


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# File 'library/types/src/modules/Punycode.rb', line 122

def GetEncodedCachedString(decoded_string)
  ret = nil

  # numbers and empty strings are not converted
  return decoded_string if NOT_CACHED_REGEXP.match?(decoded_string)

  counter = -1  # searching through decoded strings to find the index

  Builtins.foreach(@cache_decoded) do |cached_string|
    counter = Ops.add(counter, 1)
    if cached_string == decoded_string      # returning encoded representation

      ret = Ops.get(@cache_encoded, counter)
      raise Break
    end
  end

  ret
end

#GetMaximumCacheSize ⇒ Fixnum

Returns the maximum cache size (sum of already converted strings).

See Also:

  • #SetMaximumCacheSize()

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# File 'library/types/src/modules/Punycode.rb', line 65

def GetMaximumCacheSize
  @maximum_cache_size
end

#GetTmpDirectory ⇒ Object

Returns the current temporary directory. Lazy loading for the initialization is used.


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# File 'library/types/src/modules/Punycode.rb', line 169

def GetTmpDirectory
  @tmp_dir = Convert.to_string(SCR.Read(path(".target.tmpdir"))) if @tmp_dir.nil?

  @tmp_dir
end

#main ⇒ Object 


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# File 'library/types/src/modules/Punycode.rb', line 38

def main
  textdomain "base"

  @tmp_dir = nil

  #
  # Encoded string in cache has the same index
  # as its Decoded format in the second list.
  #

  # list of encoded strings to be cached (Punycode or Unicode)
  @cache_encoded = []  # list of decoded strings to be cached (Unicode or Punycode)

  @cache_decoded = []

  @current_cache_index = 0

  # cached amount of data should be controled
  @current_cache_size = 0
  @maximum_cache_size = 32_768
end

#SetMaximumCacheSize(new_max_size) ⇒ Object

Offers to set the maximum cache size (sum of already converted strings).

See Also:

  • #GetMaximumCacheSize()

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# File 'library/types/src/modules/Punycode.rb', line 74

def SetMaximumCacheSize(new_max_size)
  if !new_max_size.nil?
    @maximum_cache_size = new_max_size
  else
    Builtins.y2error("Cannot set MaximumCacheSize to nil!")
  end

  nil
end