Module: RDF::Tabular::UAX35

Included in:
Datatype
Defined in:
lib/rdf/tabular/uax35.rb

Overview

Utilities for parsing UAX35 dates and numbers.

See Also:

Defined Under Namespace

Classes: ParseError

Instance Method Summary collapse

Instance Method Details

#build_number_re(pattern, groupChar, decimalChar) ⇒ Regexp

Build a regular expression from the provided pattern to match value, after suitable modifications

Parameters:

  • pattern (String)
  • groupChar (String)
  • decimalChar (String)

Returns:

  • (Regexp) —

    Regular expression matching value

Raises:

  • (ArgumentError) —

    if pattern is not valid



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# File 'lib/rdf/tabular/uax35.rb', line 262

def build_number_re(pattern, groupChar, decimalChar)
  # pattern must be composed of only 0, #, decimalChar, groupChar, E, %, and ‰

  ge = Regexp.escape groupChar
  de = Regexp.escape decimalChar

  default_pattern = /^
    ([+-]?
     [\d#{ge}]+
     (#{de}[\d#{ge}]+
      ([Ee][+-]?\d+)?
     )?[%‰]?
    |NAN|INF|-INF)
  $/x

  return default_pattern if pattern.nil?
  numeric_pattern = /
    # Mantissa
    (\#|#{ge})*
    (0|#{ge})*
    # Fractional
    (?:#{de}
      (0|#{ge})*
      (\#|#{ge})*
      # Exponent
      (E
        [+-]?
        (?:\#|#{ge})*
        (?:0|#{ge})*
      )?
    )?
  /x

  legal_number_pattern = /^(?<prefix>[^\#0]*)(?<numeric_part>#{numeric_pattern})(?<suffix>.*)$/x

  match = legal_number_pattern.match(pattern)
  raise ArgumentError, "unrecognized number pattern #{pattern}" if match["numeric_part"].empty?

  prefix, numeric_part, suffix = match["prefix"], match["numeric_part"], match["suffix"]
  prefix = Regexp.escape prefix unless prefix.empty?
  prefix += "[+-]?" unless prefix =~ /[+-]/
  suffix = Regexp.escape suffix unless suffix.empty?

  # Split on decimalChar and E
  parts = numeric_part.split("E")
  mantissa_part, exponent_part = parts[0], (parts[1] || '')

  mantissa_parts = mantissa_part.split(decimalChar)
  raise ArgumentError, "Multiple decimal separators in #{pattern}" if mantissa_parts.length > 2
  integer_part, fractional_part = mantissa_parts[0], mantissa_parts[1] || ''

  min_integer_digits = integer_part.gsub(groupChar, '').gsub('#', '').length
  all_integer_digits = integer_part.gsub(groupChar, '').length
  all_integer_digits += 1 if all_integer_digits == min_integer_digits
  min_fractional_digits = fractional_part.gsub(groupChar, '').gsub('#', '').length
  max_fractional_digits = fractional_part.gsub(groupChar, '').length
  exponent_sign = exponent_part[0] if exponent_part =~ /^[+-]/
  min_exponent_digits = exponent_part.sub(/[+-]/, '').gsub("#", "").length
  max_exponent_digits = exponent_part.sub(/[+-]/, '').length

  integer_parts = integer_part.split(groupChar)[1..-1]
  primary_grouping_size = integer_parts[-1].to_s.length
  secondary_grouping_size = integer_parts.length <= 1 ? primary_grouping_size : integer_parts[-2].length

  fractional_parts = fractional_part.split(groupChar)[0..-2]
  fractional_grouping_size = fractional_parts[0].to_s.length

  # Construct regular expression for integer part
  integer_str = if primary_grouping_size == 0
    "\\d{#{min_integer_digits},}"
  else
    # These number of groupings must be there
    integer_parts = []
    integer_rem = 0
    while min_integer_digits > 0
      sz = [primary_grouping_size, min_integer_digits].min
      integer_rem = primary_grouping_size - sz
      integer_parts << "\\d{#{sz}}"
      min_integer_digits -= sz
      all_integer_digits -= sz
      primary_grouping_size = secondary_grouping_size
    end
    required_digits = integer_parts.reverse.join(ge)

    if all_integer_digits > 0
      # Add digits up to end of group creating
      # (?:(?:\d)?)\d)? ...
      integer_parts = []
      while integer_rem > 0
        integer_parts << '\d'
        integer_rem -= 1
      end

      # If secondary_grouping_size is not primary_grouping_size, add digits up to secondary_grouping_size
      if secondary_grouping_size != primary_grouping_size
        primary_grouping_size = secondary_grouping_size
        integer_rem = primary_grouping_size - 1
        integer_parts << '\d' + ge

        while integer_rem > 0
          integer_parts << '\d'
          integer_rem -= 1
        end
      end

      # Allow repeated separated groups
      if integer_parts.empty?
        opt_digits = "(?:\\d{1,#{primary_grouping_size}}#{ge})?(?:\\d{#{primary_grouping_size}}#{ge})*"
      else
        integer_parts[-1] = "(?:\\d{1,#{primary_grouping_size}}#{ge})?(?:\\d{#{primary_grouping_size}}#{ge})*#{integer_parts[-1]}"
        opt_digits = integer_parts.reverse.inject("") {|memo, part| "(?:#{memo}#{part})?"}
      end

      opt_digits + required_digits
    else
      required_digits
    end
  end

  # Construct regular expression for fractional part
  fractional_str = if max_fractional_digits > 0
    if fractional_grouping_size == 0
      min_fractional_digits == max_fractional_digits ? "\\d{#{max_fractional_digits}}" : "\\d{#{min_fractional_digits},#{max_fractional_digits}}"
    else
      # These number of groupings must be there
      fractional_parts = []
      fractional_rem = 0
      while min_fractional_digits > 0
        sz = [fractional_grouping_size, min_fractional_digits].min
        fractional_rem = fractional_grouping_size - sz
        fractional_parts << "\\d{#{sz}}"
        max_fractional_digits -= sz
        min_fractional_digits -= sz
      end
      required_digits = fractional_parts.join(ge)

      # If max digits fill within existing group
      fractional_parts = []
      while max_fractional_digits > 0
        fractional_parts << (fractional_rem == 0 ? ge + '\d' : '\d')
        max_fractional_digits -= 1
        fractional_rem = (fractional_rem - 1) % fractional_grouping_size
      end

      opt_digits = fractional_parts.reverse.inject("") {|memo, part| "(?:#{part}#{memo})?"}
      required_digits + opt_digits
    end
  end.to_s
  fractional_str = de + fractional_str unless fractional_str.empty?
  fractional_str = "(?:#{fractional_str})?" if max_fractional_digits > 0 && min_fractional_digits == 0

  # Exponent pattern
  exponent_str = case
  when max_exponent_digits > 0 && max_exponent_digits == min_exponent_digits
    "E#{exponent_sign ? Regexp.escape(exponent_sign) : '[+-]?'}\\d{#{max_exponent_digits}}"
  when max_exponent_digits > 0
    "E#{exponent_sign ? Regexp.escape(exponent_sign) : '[+-]?'}\\d{#{min_exponent_digits},#{max_exponent_digits}}"
  when min_exponent_digits > 0
    "E#{exponent_sign ? Regexp.escape(exponent_sign) : '[+-]?'}\\d{#{min_exponent_digits},#{max_exponent_digits}}"
  end

  Regexp.new("^(?<prefix>#{prefix})(?<numeric_part>#{integer_str}#{fractional_str}#{exponent_str})(?<suffix>#{suffix})$")
end

#parse_uax35_date(pattern, value) ⇒ String

Parse the date pattern (if provided), and match against the value (if provided) Otherwise, validate pattern and raise an error.

Supported patterns are:

  • yyyy-MM-dd

  • yyyyMMdd

  • dd-MM-yyyy

  • d-M-yyyy

  • d-M-yy

  • d-M-y

  • MM-dd-yyyy

  • M-d-yyyy

  • M-d-yy

  • M-d-y

  • dd/MM/yyyy

  • d/M/yyyy

  • d/M/yy

  • d/M/y

  • MM/dd/yyyy

  • M/d/yyyy

  • M/d/yy

  • M/d/y

  • dd.MM.yyyy

  • d.M.yyyy

  • d.M.yy

  • d.M.y

  • MM.dd.yyyy

  • M.d.yyyy

  • M.d.yy

  • M.d.y

  • yyyy-MM-ddTHH:mm

  • yyyy-MM-ddTHH:mm:ss

  • yyyy-MM-ddTHH:mm:ss.S+

Year comonents less than four digits are normalized to 1900 or 2000 based on if the value is <= 99 or >= 70, it is considered to be in the 1900 range, otherwise, based on 2000.

Parameters:

  • pattern (String)
  • value (String)

Returns:

  • (String) —

    XMLSchema version of value

Raises:

  • (ArgumentError) —

    if pattern is not valid, or nil

  • (ParseError) —

    if value does not match



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# File 'lib/rdf/tabular/uax35.rb', line 52

def parse_uax35_date(pattern, value)
  date_pattern, time_pattern = nil, nil
  return value unless pattern
  orig_value = value ||= ""
  orig_pattern = pattern

  # Extract tz info
  if md = pattern.match(/^(.*[dyms])+(\s*[xX]+)$/)
    pattern, tz_pattern = md[1], md[2]
  end

  date_pattern, time_pattern = pattern.split(' ')
  # Snuff out if this is a Time pattern
  date_pattern, time_pattern = nil, date_pattern if time_pattern.nil? && !date_pattern.match(/[TyMd]/)

  # Extract date, of specified
  date_part = case date_pattern
  when 'yyyy-MM-dd' then value.match(/^(?<yr>\d{4})-(?<mo>\d{2})-(?<da>\d{2})/)
  when 'yyyyMMdd'   then value.match(/^(?<yr>\d{4})(?<mo>\d{2})(?<da>\d{2})/)
  when 'dd-MM-yyyy' then value.match(/^(?<da>\d{2})-(?<mo>\d{2})-(?<yr>\d{4})/)
  when 'd-M-yyyy'   then value.match(/^(?<da>\d{1,2})-(?<mo>\d{1,2})-(?<yr>\d{4})/)
  when 'd-M-yy'     then value.match(/^(?<da>\d{1,2})-(?<mo>\d{1,2})-(?<yr>\d{2})/)
  when 'd-M-y'      then value.match(/^(?<da>\d{1,2})-(?<mo>\d{1,2})-(?<yr>\d{1,4})/)
  when 'MM-dd-yyyy' then value.match(/^(?<mo>\d{2})-(?<da>\d{2})-(?<yr>\d{4})/)
  when 'M-d-yyyy'   then value.match(/^(?<mo>\d{1,2})-(?<da>\d{1,2})-(?<yr>\d{4})/)
  when 'M-d-yy'     then value.match(/^(?<mo>\d{1,2})-(?<da>\d{1,2})-(?<yr>\d{2})/)
  when 'M-d-y'      then value.match(/^(?<mo>\d{1,2})-(?<da>\d{1,2})-(?<yr>\d{1,4})/)
  when 'dd/MM/yyyy' then value.match(/^(?<da>\d{2})\/(?<mo>\d{2})\/(?<yr>\d{1,4})/)
  when 'd/M/yyyy'   then value.match(/^(?<da>\d{1,2})\/(?<mo>\d{1,2})\/(?<yr>\d{4})/)
  when 'd/M/yy'     then value.match(/^(?<da>\d{1,2})\/(?<mo>\d{1,2})\/(?<yr>\d{2})/)
  when 'd/M/y'      then value.match(/^(?<da>\d{1,2})\/(?<mo>\d{1,2})\/(?<yr>\d{1,4})/)
  when 'MM/dd/yyyy' then value.match(/^(?<mo>\d{2})\/(?<da>\d{2})\/(?<yr>\d{1,4})/)
  when 'M/d/yyyy'   then value.match(/^(?<mo>\d{1,2})\/(?<da>\d{1,2})\/(?<yr>\d{4})/)
  when 'M/d/yy'     then value.match(/^(?<mo>\d{1,2})\/(?<da>\d{1,2})\/(?<yr>\d{2})/)
  when 'M/d/y'      then value.match(/^(?<mo>\d{1,2})\/(?<da>\d{1,2})\/(?<yr>\d{1,4})/)
  when 'dd.MM.yyyy' then value.match(/^(?<da>\d{2})\.(?<mo>\d{2})\.(?<yr>\d{4})/)
  when 'd.M.yyyy'   then value.match(/^(?<da>\d{1,2})\.(?<mo>\d{1,2})\.(?<yr>\d{4})/)
  when 'd.M.yy'     then value.match(/^(?<da>\d{1,2})\.(?<mo>\d{1,2})\.(?<yr>\d{2})/)
  when 'd.M.y'      then value.match(/^(?<da>\d{1,2})\.(?<mo>\d{1,2})\.(?<yr>\d{1,4})/)
  when 'MM.dd.yyyy' then value.match(/^(?<mo>\d{2})\.(?<da>\d{2})\.(?<yr>\d{4})/)
  when 'M.d.yyyy'   then value.match(/^(?<mo>\d{1,2})\.(?<da>\d{1,2})\.(?<yr>\d{4})/)
  when 'M.d.yy'     then value.match(/^(?<mo>\d{1,2})\.(?<da>\d{1,2})\.(?<yr>\d{2})/)
  when 'M.d.y'      then value.match(/^(?<mo>\d{1,2})\.(?<da>\d{1,2})\.(?<yr>\d{1,4})/)
  when 'yyyy-MM-ddTHH:mm' then value.match(/^(?<yr>\d{4})-(?<mo>\d{2})-(?<da>\d{2})T(?<hr>\d{2}):(?<mi>\d{2})(?<se>(?<ms>))/)
  when 'yyyy-MM-ddTHH:mm:ss' then value.match(/^(?<yr>\d{4})-(?<mo>\d{2})-(?<da>\d{2})T(?<hr>\d{2}):(?<mi>\d{2}):(?<se>\d{2})(?<ms>)/)
  when /yyyy-MM-ddTHH:mm:ss\.S+/
    md = value.match(/^(?<yr>\d{4})-(?<mo>\d{2})-(?<da>\d{2})T(?<hr>\d{2}):(?<mi>\d{2}):(?<se>\d{2})\.(?<ms>\d+)/)
    num_ms = date_pattern.match(/S+/).to_s.length
    md if md && md[:ms].length <= num_ms
  else
    raise ArgumentError, "unrecognized date/time pattern #{date_pattern}" if date_pattern
    nil
  end

  # Forward past date part
  if date_part
    value = value[date_part.to_s.length..-1]
    value = value.lstrip if date_part && value.start_with?(' ')
  end

  # Extract time, of specified
  time_part = case time_pattern
  when 'HH:mm:ss' then value.match(/^(?<hr>\d{2}):(?<mi>\d{2}):(?<se>\d{2})(?<ms>)/)
  when 'HHmmss'   then value.match(/^(?<hr>\d{2})(?<mi>\d{2})(?<se>\d{2})(?<ms>)/)
  when 'HH:mm'    then value.match(/^(?<hr>\d{2}):(?<mi>\d{2})(?<se>)(?<ms>)/)
  when 'HHmm'     then value.match(/^(?<hr>\d{2})(?<mi>\d{2})(?<se>)(?<ms>)/)
  when /HH:mm:ss\.S+/
    md = value.match(/^(?<hr>\d{2}):(?<mi>\d{2}):(?<se>\d{2})\.(?<ms>\d+)/)
    num_ms = time_pattern.match(/S+/).to_s.length
    md if md && md[:ms].length <= num_ms
  else
    raise ArgumentError, "unrecognized date/time pattern #{pattern}" if time_pattern
    nil
  end

  # If there's a date_pattern but no date_part, match fails
  raise ParseError, "#{orig_value} does not match pattern #{orig_pattern}" if !orig_value.empty? && date_pattern && date_part.nil?

  # If there's a time_pattern but no time_part, match fails
  raise ParseError, "#{orig_value} does not match pattern #{orig_pattern}" if !orig_value.empty? && time_pattern && time_part.nil?

  # Forward past time part
  value = value[time_part.to_s.length..-1] if time_part

  # Use datetime match for time
  time_part = date_part if date_part && date_part.names.include?("hr")

  # If there's a timezone, it may optionally start with whitespace
  value = value.lstrip if tz_pattern.to_s.start_with?(' ')
  tz_part = case tz_pattern.to_s.lstrip
  when 'x'    then value.match(/^(?:(?<hr>[+-]\d{2})(?<mi>\d{2})?)$/)
  when 'X'    then value.match(/^(?:(?:(?<hr>[+-]\d{2})(?<mi>\d{2})?)|(?<z>Z))$/)
  when 'xx'   then value.match(/^(?:(?<hr>[+-]\d{2})(?<mi>\d{2}))|$/)
  when 'XX'   then value.match(/^(?:(?:(?<hr>[+-]\d{2})(?<mi>\d{2}))|(?<z>Z))$/)
  when 'xxx'  then value.match(/^(?:(?<hr>[+-]\d{2}):(?<mi>\d{2}))$/)
  when 'XXX'  then value.match(/^(?:(?:(?<hr>[+-]\d{2}):(?<mi>\d{2}))|(?<z>Z))$/)
  else
    raise ArgumentError, "unrecognized timezone pattern #{tz_pattern.to_s.lstrip}" if tz_pattern
    nil
  end

  # If there's a tz_pattern but no time_part, match fails
  raise ParseError, "#{orig_value} does not match pattern #{orig_pattern}" if !orig_value.empty? && tz_pattern && tz_part.nil?

  # Compose normalized value
  vd = if date_part
    yr, mo, da = [date_part[:yr], date_part[:mo], date_part[:da]].map(&:to_i)

    if date_part[:yr].length < 4
      # Make sure that yr makes sense, if given
      yr = case yr
      when 0..69    then yr + 2000
      when 100..999 then yr + 2000
      when 70..99   then yr + 1900
      else               yr
      end
    end

    ("%04d-%02d-%02d" % [yr, mo, da])
  end

  vt = ("%02d:%02d:%02d" % [time_part[:hr].to_i, time_part[:mi].to_i, time_part[:se].to_i]) if time_part

  # Add milliseconds, if matched
  vt += ".#{time_part[:ms]}" if time_part && !time_part[:ms].empty?

  value = [vd, vt].compact.join('T')
  value += tz_part[:z] ? "Z" : ("%s:%02d" % [tz_part[:hr], tz_part[:mi].to_i]) if tz_part
  value
end

#parse_uax35_number(pattern, value, groupChar = ",", decimalChar = ".") ⇒ String

Parse the date pattern (if provided), and match against the value (if provided) Otherwise, validate pattern and raise an error

Parameters:

  • pattern (String)
  • value (String)
  • groupChar (String) (defaults to: ",")
  • decimalChar (String) (defaults to: ".")

Returns:

  • (String) —

    XMLSchema version of value or nil, if value does not match

Raises:

  • (ArgumentError) —

    if pattern is not valid



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# File 'lib/rdf/tabular/uax35.rb', line 193

def parse_uax35_number(pattern, value, groupChar=",", decimalChar=".")
  value ||= ""

  re = build_number_re(pattern, groupChar, decimalChar)

  raise ParseError, "#{value} has repeating #{groupChar.inspect}" if groupChar.length == 1 && value.include?(groupChar*2)

  # Upcase value and remove internal spaces
  value = value.upcase

  if value =~ re
    # Upcase value and remove internal spaces
    value = value.
      gsub(/\s+/, '').
      gsub(groupChar, '').
      gsub(decimalChar, '.')

    # result re-assembles parts removed from value
    value
  elsif !value.empty?
    # no match
    raise ParseError, "#{value.inspect} does not match #{pattern.inspect}"
  end

  # Extract percent or per-mille sign
  case value
  when /%/
    value = value.sub('%', '')
    lhs, rhs = value.split('.')

    # Shift decimal
    value = case lhs.length
    when 0 then "0.00#{rhs}".sub('E', 'e')
    when 1 then "0.0#{lhs}#{rhs}".sub('E', 'e')
    when 2 then "0.#{lhs}#{rhs}".sub('E', 'e')
    else
      ll, lr = lhs[0..lhs.length-3], lhs[-2..-1]
      ll = ll + "0" unless ll =~ /\d+/
      "#{ll}.#{lr}#{rhs}".sub('E', 'e')
    end
  when /‰/
    value = value.sub('‰', '')
    lhs, rhs = value.split('.')

    # Shift decimal
    value = case lhs.length
    when 0 then "0.000#{rhs}".sub('E', 'e')
    when 1 then "0.00#{lhs}#{rhs}".sub('E', 'e')
    when 2 then "0.0#{lhs}#{rhs}".sub('E', 'e')
    when 3 then "0.#{lhs}#{rhs}".sub('E', 'e')
    else
      ll, lr = lhs[0..lhs.length-4], lhs[-3..-1]
      ll = ll + "0" unless ll =~ /\d+/
      "#{ll}.#{lr}#{rhs}".sub('E', 'e')
    end
  when /NAN/ then value.sub('NAN', 'NaN')
  when /E/ then value.sub('E', 'e')
  else
    value
  end
end