67 lines
1.8 KiB
Ruby
67 lines
1.8 KiB
Ruby
# frozen_string_literal: true
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module Packages
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module Debian
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# Parse String as Debian RFC822 control data format
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# https://manpages.debian.org/unstable/dpkg-dev/deb822.5
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class ParseDebian822Service
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InvalidDebian822Error = Class.new(StandardError)
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def initialize(input)
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@input = input
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end
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def execute
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output = {}
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@input.each_line('', chomp: true) do |block|
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section = {}
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section_name, field = nil
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block.each_line(chomp: true) do |line|
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next if comment_line?(line)
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if continuation_line?(line)
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raise InvalidDebian822Error, "Parse error. Unexpected continuation line" if field.nil?
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section[field] += "\n"
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section[field] += line[1..] unless paragraph_separator?(line)
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elsif match = match_section_line(line)
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section_name = match[:name] if section_name.nil?
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field = match[:field]
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raise InvalidDebian822Error, "Duplicate field '#{field}' in section '#{section_name}'" if section.include?(field)
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section[field] = match[:value]
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else
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raise InvalidDebian822Error, "Parse error on line #{line}"
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end
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end
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raise InvalidDebian822Error, "Duplicate section '#{section_name}'" if output[section_name]
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output[section_name] = section
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end
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output
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end
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private
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def comment_line?(line)
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line.match?(/^#/)
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end
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def continuation_line?(line)
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line.match?(/^ /)
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end
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def paragraph_separator?(line)
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line == ' .'
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end
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def match_section_line(line)
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line.match(/(?<name>(?<field>^\S+):\s*(?<value>.*))/)
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end
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end
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end
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end
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