Class: Pubid::Iso::UrnParser

Inherits:
Object
  • Object
show all
Defined in:
lib/pubid/iso/urn_parser.rb

Overview

Parses RFC 5141-bis compliant URNs into ISO identifiers

URN format: urn:iso:std:publisher:type:number:year:supplements

Examples:

  • urn:iso:std:iso:9001:2019

  • urn:iso:std:iso:tr:9001:2019

  • urn:iso:std:iso:9001:2019:stage-40.00

  • urn:iso:std:iso:9001:2019:amd:1:2020

  • urn:iso:std:iso-iec:27001:2013

Constant Summary collapse

TYPED_STAGE_REVERSE_MAP =

Reverse mappings from URN format to PubID components

{
  "WD" => :wd,
  "WDS" => :wds,
  "CD" => :cd,
  "CDV" => :cdv,
  "DIS" => :dis,
  "FDIS" => :fdis,
  "PDAM" => :pdam,
  "DAM" => :dam,
  "FDAM" => :fdamd,
  "DCOR" => :dcor,
  "FDCOR" => :fdcor,
  "CDTS" => :cdts,
  "DTS" => :dts,
  "FDTS" => :fdts,
}.freeze
SUPPLEMENT_TYPE_MAP = 
{
  "amd" => :amd,
  "cor" => :cor,
  "sup" => :sup,
  "add" => :add,
}.freeze
TYPE_CODE_REVERSE_MAP = 
{
  "tr" => :tr,
  "ts" => :ts,
  "pas" => :pas,
  "guide" => :guide,
  "dir" => :dir,
  "dir-sup" => :dir_sup,
  "iwa-sup" => :iwa_sup,
  "isp" => :isp,
  "iwa" => :iwa,
  "r" => :r,
  "data" => :data,
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.parse(urn) ⇒ Identifier

Parse ISO URN string

Parameters:

  • urn (String) —

    URN string to parse

Returns:



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# File 'lib/pubid/iso/urn_parser.rb', line 58

def self.parse(urn)
  new.parse_urn(urn)
end

Instance Method Details

#parse_urn(urn) ⇒ Identifier

Parse URN string into identifier

Parameters:

  • urn (String) —

    URN string

Returns:



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# File 'lib/pubid/iso/urn_parser.rb', line 65

def parse_urn(urn)
  # Remove urn:iso:std: prefix
  unless urn.start_with?("urn:iso:std:")
    raise ArgumentError,
          "Invalid ISO URN: #{urn}"
  end

  parts = urn.sub("urn:iso:std:", "").split(":")

  # Parse publisher(s) - first part
  publishers = parse_publisher(parts.shift)

  # Parse type - optional (defaults to IS)
  type_code = nil
  type_code = parse_type(parts.first) if parts.first && TYPE_CODE_REVERSE_MAP.key?(parts.first.downcase)
  parts.shift if type_code

  # Parse number
  number_part = parts.shift
  number, part, subpart = parse_number_part(number_part)

  # Parse year if present (4-digit year)
  year = nil
  if parts.first&.match(/^\d{4}$/)
    year = parts.shift
  end

  # Handle URN-style part notation (:-22, :-5-1-1, etc.)
  # These can come before or after year/edition in URN format
  # Note: The parts are split by ':', so :-22 becomes two parts: "10164" and "-22"
  if parts.first&.start_with?("-")
    part_str = parts.shift
    # Re-parse the number part with the URN-style part
    number, part, subpart = parse_number_part("#{number}#{part_str}")
  end

  # Parse year if present (4-digit year) - may come after part
  if year.nil? && parts.first&.match(/^\d{4}$/)
    year = parts.shift
  end

  # Parse edition if present (ed-N format) - comes after year in URN
  edition = nil
  if parts.first&.start_with?("ed-")
    edition = parts.shift.sub("ed-", "").to_i
  end

  # Parse language if present (2-letter codes like "en" or comma-separated)
  languages = nil
  if parts.first && !parts.first.match(/^\d+$/) &&
      !parts.first.match?(/^(amd|cor|sup|add|v\d+|stage-|ed-)/i) &&
      !TYPED_STAGE_REVERSE_MAP.key?(parts.first.upcase) &&
      !parts.first.match?(/^[A-Z]+\.\d+$/i)
    languages = parse_languages(parts.shift)
  end

  # Check for stage (stage-XX.XX or typed stage like WD, CD, etc.)
  # IMPORTANT: This must come AFTER edition/part/language parsing but BEFORE supplements parsing
  stage_code = nil
  stage_iteration = nil
  harmonized_stage_code = nil # Track full harmonized code for lookup
  stage_from_abbr = nil # Track stage code from typed abbreviation
  if parts.first&.start_with?("stage-")
    stage_str = parts.shift
    stage_code, stage_iteration = parse_stage_code(stage_str)
    # Set harmonized_stage_code AFTER parse_stage_code has stripped .vX suffix
    harmonized_stage_code = stage_str.sub("stage-", "").sub(/\.v\d+$/i,
                                                            "")
  elsif TYPED_STAGE_REVERSE_MAP.key?(parts.first&.upcase) ||
      (parts.first&.match?(/^[A-Za-z]+\.\d+$/) &&
       TYPED_STAGE_REVERSE_MAP.key?(parts.first.upcase.split(".").first))
    stage_abbr = parts.shift.upcase
    # Check for iteration (WD.2 format)
    if stage_abbr.include?(".")
      abbr_part, iteration_part = stage_abbr.split(".")
      stage_code = TYPED_STAGE_REVERSE_MAP[abbr_part]
      stage_from_abbr = stage_code
      stage_iteration = iteration_part.to_i
    else
      stage_code = TYPED_STAGE_REVERSE_MAP[stage_abbr]
      stage_from_abbr = stage_code
    end
  end

  # Check for supplements (amd, cor, sup, add)
  supplements = []
  while parts.any?
    supp_type = nil
    supp_number = nil
    supp_year = nil
    supp_stage = nil

    # Check for supplement stage
    if parts.first&.start_with?("stage-")
      supp_stage_data = parts.shift
      supp_stage, = parse_stage_code(supp_stage_data)
    elsif TYPED_STAGE_REVERSE_MAP.key?(parts.first&.upcase)
      supp_stage_abbr = parts.shift.upcase
      supp_stage = TYPED_STAGE_REVERSE_MAP[supp_stage_abbr]
    end

    # Check for supplement type (amd, cor, sup, add)
    if SUPPLEMENT_TYPE_MAP.key?(parts.first&.downcase)
      supp_type = SUPPLEMENT_TYPE_MAP[parts.shift.downcase]
    end

    # Check for year or supplement number
    if parts.first&.match(/^\d+$/)
      if parts.first&.match(/^\d{4}$/)
        # 4 digits = year
        supp_year = parts.shift
      else
        # 1-3 digits = supplement number
        supp_number = parts.shift.to_i
      end
    end

    # Check for version (v1, v2, etc.) after year or number
    if parts.first&.start_with?("v")
      version_str = parts.shift
      supp_number = version_str.sub("v", "").to_i
      # Handle version with iteration (v1.2)
      if supp_number.to_s.include?(".")
        supp_number, = supp_number.to_s.split(".")
        supp_number = supp_number.to_i
      end
    end

    # Next part might be year if not already set
    if supp_year.nil? && parts.first&.match(/^\d{4}$/)
      supp_year = parts.shift
    end

    # Check for language after supplement
    supp_languages = nil
    if parts.first && !parts.first.match(/^\d+$/) && !parts.first.match?(/^(amd|cor|sup|add|v\d+|stage-)/i)
      supp_languages = parse_languages(parts.shift)
    end

    supplements << {
      type: supp_type,
      number: supp_number,
      year: supp_year,
      stage: supp_stage,
      languages: supp_languages,
    }
  end

  # Build the identifier hash
  build_identifier(publishers, number, part, subpart, type_code, stage_code, stage_iteration,
                   harmonized_stage_code, stage_from_abbr, year, edition, languages, supplements)
end