Class: String

Inherits:
Object show all
Defined in:
lib/openc3/core_ext/string.rb,
lib/openc3/io/json_rpc.rb

Overview

OpenC3 specific additions to the Ruby String class

Constant Summary collapse

NON_ASCII_PRINTABLE = 
/[^\x21-\x7e\s]/
NON_UTF8_PRINTABLE = 
/[\x00-\x08\x0E-\x1F\x7F]/
PRINTABLE_RANGE =

The printable range of ASCII characters

32..126
NON_PRINTABLE_REGEX =

Regular expression to identify a character that is not in the printable range

/[^\s!-~]/
FLOAT_CHECK_REGEX =

Regular expression to identify a String as a floating point number

/\A\s*[-+]?\d*\.\d+\s*\z/
SCIENTIFIC_CHECK_REGEX =

Regular expression to identify a String as a floating point number in scientific notation

/\A\s*[-+]?(\d+((\.\d+)?)|(\.\d+))[eE][-+]?\d+\s*\z/
INT_CHECK_REGEX =

Regular expression to identify a String as an integer

/\A\s*[-+]?\d+\s*\z/
HEX_CHECK_REGEX =

Regular expression to identify a String as an integer in hexadecimal format

/\A\s*0[xX][\dabcdefABCDEF]+\s*\z/
ARRAY_CHECK_REGEX =

Regular expression to identify a String as an Array of numbers

/\A\s*\[.*\]\s*\z/
OBJECT_CHECK_REGEX =

Regular expression to identify a String containing object notation

/\A\s*\{.*\}\s*\z/

Instance Method Summary collapse

Instance Method Details

#as_json(_options = nil) ⇒ Object 



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# File 'lib/openc3/io/json_rpc.rb', line 61

def as_json(_options = nil)
  # If string is ASCII-8BIT (binary) and has non-ASCII bytes (> 127), encode as binary
  # This handles data from hex_to_byte_string and other binary sources
  if self.encoding == Encoding::ASCII_8BIT && self.bytes.any? { |b| b > 127 }
    return self.to_json_raw_object
  end

  as_utf8 = self.dup.force_encoding('UTF-8')
  if as_utf8.valid_encoding?
    if as_utf8 =~ NON_UTF8_PRINTABLE
      return self.to_json_raw_object
    else
      return as_utf8
    end
  else
    return self.to_json_raw_object
  end
end

#class_name_to_filename(include_extension = true) ⇒ String

Converts a String representing a class (i.e. “MyGreatClass”) to a Ruby filename which implements the class (i.e. “my_great_class.rb”).



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# File 'lib/openc3/core_ext/string.rb', line 298

def class_name_to_filename(include_extension = true)
  string = self.split("::")[-1] # Remove any namespacing
  filename = ''
  length = string.length
  length.times do |index|
    filename << '_' if index != 0 and string[index..index] == string[index..index].upcase
    filename << string[index..index].downcase
  end
  filename << '.rb' if include_extension
  filename
end

#comment_erb ⇒ Object 



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# File 'lib/openc3/core_ext/string.rb', line 400

def comment_erb
  output = self.lines.collect! do |line|
    # If we have a commented out line that starts with #
    # but not followed by % (allows for disabling ERB comments),
    # which contains an ERB statement (<% ...)
    # then comment out the ERB statement (<%# ...).
    # We explicitly don't comment out trailing ERB statements
    # as that is not typical and is difficult to regex
    if line =~ /^\s*#[^%]*<%/
      line.gsub!('<%', '<%#')
    end
    line
  end
  return output.join("")
end

#convert_to_value ⇒ Object

depending on what the String represents. It can successfully convert floating point numbers in both fixed and scientific notation, integers in hexadecimal notation, and Arrays. If it can’t be converted into any of the above then the original String is returned.



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# File 'lib/openc3/core_ext/string.rb', line 230

def convert_to_value
  return_value = self
  begin
    upcase_self = self.upcase
    if upcase_self == 'INFINITY'.freeze
      return_value = Float::INFINITY
    elsif upcase_self == '-INFINITY'.freeze
      return_value = -Float::INFINITY
    elsif upcase_self == 'NAN'.freeze
      return_value = Float::NAN
    elsif self.is_float?
      # Floating Point in normal or scientific notation
      return_value = self.to_f
    elsif self.is_int?
      # Integer
      return_value = self.to_i
    elsif self.is_hex?
      # Hex
      return_value = Integer(self)
    elsif self.is_array? or self.is_object?
      # Array or Object
      return_value = YAML.safe_load(self)
    end
  rescue Exception
    # Something went wrong so just return the string as is
  end
  return return_value
end

#filename_to_class_name ⇒ String

Converts a String representing a filename (i.e. “my_great_class.rb”) to a Ruby class name (i.e. “MyGreatClass”).



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# File 'lib/openc3/core_ext/string.rb', line 314

def filename_to_class_name
  filename = File.basename(self)
  class_name = ''
  length = filename.length
  upcase_next = true
  length.times do |index|
    break if filename[index..index] == '.'

    if filename[index..index] == '_'
      upcase_next = true
    elsif upcase_next
      class_name << filename[index..index].upcase
      upcase_next = false
    else
      class_name << filename[index..index].downcase
    end
  end
  class_name
end

#formatted(word_size = 1, words_per_line = 16, word_separator = ' ', indent = 0, show_address = true, address_separator = ': ', show_ascii = true, ascii_separator = ' ', unprintable_character = ' ', line_separator = "\n") ⇒ Object

Displays a String containing binary data in a human readable format by converting each byte to the hex representation.



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# File 'lib/openc3/core_ext/string.rb', line 70

def formatted(
  word_size = 1,
  words_per_line = 16,
  word_separator = ' ',
  indent = 0,
  show_address = true,
  address_separator = ': ',
  show_ascii = true,
  ascii_separator = '  ',
  unprintable_character = ' ',
  line_separator = "\n"
)
  string = ''
  byte_offset = 0
  bytes_per_line = word_size * words_per_line
  indent_string = ' ' * indent
  ascii_line = ''

  self.each_byte do |byte|
    if byte_offset % bytes_per_line == 0
      # Create the indentation at the beginning of each line
      string << indent_string

      # Add the address if requested
      string << sprintf("%08X%s", byte_offset, address_separator) if show_address
    end

    # Add the byte
    string << sprintf("%02X", byte)

    # Create the ASCII representation if requested
    if show_ascii
      if PRINTABLE_RANGE.include?(byte)
        ascii_line << [byte].pack('C')
      else
        ascii_line << unprintable_character
      end
    end

    # Move to next byte
    byte_offset += 1

    # If we're at the end of the line we output the ascii if requested
    if byte_offset % bytes_per_line == 0
      if show_ascii
        string << "#{ascii_separator}#{ascii_line}"
        ascii_line = ''
      end
      string << line_separator

    # If we're at a word junction then output the word_separator
    elsif (byte_offset % word_size == 0) and byte_offset != self.length
      string << word_separator
    end
  end

  # We're done printing all the bytes. Now check to see if we ended in the
  # middle of a line. If so we have to print out the final ASCII if
  # requested.
  if byte_offset % bytes_per_line != 0
    if show_ascii
      num_word_separators = ((byte_offset % bytes_per_line) - 1) / word_size
      existing_length = (num_word_separators * word_separator.length) + ((byte_offset % bytes_per_line) * 2)
      full_line_length = (bytes_per_line * 2) + ((words_per_line - 1) * word_separator.length)
      filler = ' ' * (full_line_length - existing_length)
      ascii_filler = ' ' * (bytes_per_line - ascii_line.length)
      string << "#{filler}#{ascii_separator}#{ascii_line}#{ascii_filler}"
      ascii_line = ''
    end
    string << line_separator
  end
  string
end

#hex_to_byte_string ⇒ String

Converts the String representing a hexadecimal number (i.e. “0xABCD”) to a binary String with the same data (i.e “xABxCD”)



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# File 'lib/openc3/core_ext/string.rb', line 263

def hex_to_byte_string
  string = self.dup

  # Remove leading 0x or 0X
  if string[0..1] == '0x' or string[0..1] == '0X'
    string = string[2..-1]
  end

  length = string.length
  length += 1 unless (length % 2) == 0

  array = []
  (length / 2).times do
    # Grab last two characters
    if string.length >= 2
      last_two_characters = string[-2..-1]
      string = string[0..-3]
    else
      last_two_characters = string[0..0]
      string = ''
    end

    int_value = Integer('0x' + last_two_characters)

    array.unshift(int_value)
  end

  array.pack("C*")
end

#is_array? ⇒ Boolean 



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# File 'lib/openc3/core_ext/string.rb', line 211

def is_array?
  if ARRAY_CHECK_REGEX.match?(self) then true else false end
end

#is_float? ⇒ Boolean 



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# File 'lib/openc3/core_ext/string.rb', line 196

def is_float?
  if self =~ FLOAT_CHECK_REGEX or self =~ SCIENTIFIC_CHECK_REGEX then true else false end
end

#is_hex? ⇒ Boolean 



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# File 'lib/openc3/core_ext/string.rb', line 206

def is_hex?
  if HEX_CHECK_REGEX.match?(self) then true else false end
end

#is_int? ⇒ Boolean 



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# File 'lib/openc3/core_ext/string.rb', line 201

def is_int?
  if INT_CHECK_REGEX.match?(self) then true else false end
end

#is_object? ⇒ Boolean 



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# File 'lib/openc3/core_ext/string.rb', line 216

def is_object?
  if OBJECT_CHECK_REGEX.match?(self) then true else false end
end

#is_printable? ⇒ Boolean 



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# File 'lib/openc3/core_ext/string.rb', line 221

def is_printable?
  if NON_PRINTABLE_REGEX.match?(self) then false else true end
end

#num_lines ⇒ Integer 



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# File 'lib/openc3/core_ext/string.rb', line 174

def num_lines
  value = self.count("\n")
  value += 1 if self[-1..-1] and self[-1..-1] != "\n"
  value
end

#quote_if_necessary(quote_char = '"') ⇒ String

Adds quotes if the string contains whitespace



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# File 'lib/openc3/core_ext/string.rb', line 366

def quote_if_necessary(quote_char = '"')
  if /\s/.match?(self)
    return quote_char + self + quote_char
  else
    return self
  end
end

#remove_line(line_number, separator = $/) ⇒ String

Uses the String each_line method to iterate through the lines and removes the line specified.



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# File 'lib/openc3/core_ext/string.rb', line 162

def remove_line(line_number, separator = $/)
  new_string = ''
  index = 1
  self.each_line(separator) do |line|
    new_string << line unless index == line_number
    index += 1
  end
  new_string
end

#remove_quotes ⇒ Object

Removes quotes from the given string if present.

"'quoted string'".remove_quotes #=> "quoted string"



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# File 'lib/openc3/core_ext/string.rb', line 182

def remove_quotes
  return self if self.length < 2

  first_char = self[0]
  return self if (first_char != '"') && (first_char != "'")

  last_char = self[-1]
  return self if first_char != last_char

  return self[1..-2]
end

#simple_formatted ⇒ Object

Displays a String containing binary data in a human readable format by converting each byte to the hex representation. Simply formatted as a single string of bytes



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# File 'lib/openc3/core_ext/string.rb', line 147

def simple_formatted
  string = ''
  self.each_byte do |byte|
    string << sprintf("%02X", byte)
  end
  string
end

#to_class ⇒ Class

Converts a String representing a class (i.e. “MyGreatClass”) to the actual class that has been required and is present in the Ruby runtime.



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# File 'lib/openc3/core_ext/string.rb', line 338

def to_class
  klass = nil
  split_self = self.split('::')
  if split_self.length > 1
    split_self.each do |class_name|
      if klass
        klass = klass.const_get(class_name)
      else
        klass = Object.const_get(class_name)
      end
    end
  else
    begin
      klass = OpenC3.const_get(self)
    rescue
      begin
        klass = Object.const_get(self)
      rescue
      end
    end
  end
  klass
end

#to_utf8 ⇒ String

Converts a string to UTF-8 and returns a new string Assumes the string is Windows-1252 encoded if marked ASCII-8BIT and not UTF-8 compatible



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# File 'lib/openc3/core_ext/string.rb', line 378

def to_utf8
  self.dup.to_utf8!
end

#to_utf8! ⇒ String

Converts a string to UTF-8 in place Assumes the string is Windows-1252 encoded if marked ASCII-8BIT and not UTF-8 compatible



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# File 'lib/openc3/core_ext/string.rb', line 386

def to_utf8!
  if self.encoding == Encoding::ASCII_8BIT
    if self.force_encoding('UTF-8').valid_encoding?
      return self
    else
      # Note: this will replace any characters without a valid conversion with space (shouldn't be possible from Windows-1252)
      return self.force_encoding('Windows-1252').encode!('UTF-8', invalid: :replace, undef: :replace, replace: ' ')
    end
  else
    # Note: this will replace any characters without a valid conversion with space
    self.encode!('UTF-8', invalid: :replace, undef: :replace, replace: ' ')
  end
end