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Edit File : yaml_serializer.rb \| Size : 2.42 KB
# frozen_string_literal: true module Gem # A stub yaml serializer that can handle only hashes and strings (as of now). module YAMLSerializer module_function def dump(hash) yaml = String.new("---") yaml << dump_hash(hash) end def dump_hash(hash) yaml = String.new("\n") hash.each do \|k, v\| yaml << k << ":" if v.is_a?(Hash) yaml << dump_hash(v).gsub(/^(?!$)/, " ") # indent all non-empty lines elsif v.is_a?(Array) # Expected to be array of strings if v.empty? yaml << " []\n" else yaml << "\n- " << v.map {\|s\| s.to_s.gsub(/\s+/, " ").inspect }.join("\n- ") << "\n" end else yaml << " " << v.to_s.gsub(/\s+/, " ").inspect << "\n" end end yaml end ARRAY_REGEX = / ^ (?:[ ]-[ ]) # '- ' before array items (['"]?) # optional opening quote (.) # value \1 # matching closing quote $ /xo HASH_REGEX = / ^ ([ ]) # indentations ([^#]+) # key excludes comment char '#' (?::(?=(?:\s\|$))) # : (without the lookahead the #key includes this when : is present in value) [ ]? (['"]?) # optional opening quote (.) # value \3 # matching closing quote $ /xo def load(str) res = {} stack = [res] last_hash = nil last_empty_key = nil str.split(/\r?\n/) do \|line\| if match = HASH_REGEX.match(line) indent, key, quote, val = match.captures val = strip_comment(val) depth = indent.size / 2 if quote.empty? && val.empty? new_hash = {} stack[depth][key] = new_hash stack[depth + 1] = new_hash last_empty_key = key last_hash = stack[depth] else val = [] if val == "[]" # empty array stack[depth][key] = val end elsif match = ARRAY_REGEX.match(line) _, val = match.captures val = strip_comment(val) last_hash[last_empty_key] = [] unless last_hash[last_empty_key].is_a?(Array) last_hash[last_empty_key].push(val) end end res end def strip_comment(val) if val.include?("#") && !val.start_with?("#") val.split("#", 2).first.strip else val end end class << self private :dump_hash end end end Back

Edit File : yaml_serializer.rb | Size : 2.42 KB

# frozen_string_literal: true

module Gem
  # A stub yaml serializer that can handle only hashes and strings (as of now).
  module YAMLSerializer
    module_function

def dump(hash)
      yaml = String.new("---")
      yaml << dump_hash(hash)
    end

def dump_hash(hash)
      yaml = String.new("\n")
      hash.each do |k, v|
        yaml << k << ":"
        if v.is_a?(Hash)
          yaml << dump_hash(v).gsub(/^(?!$)/, "  ") # indent all non-empty lines
        elsif v.is_a?(Array) # Expected to be array of strings
          if v.empty?
            yaml << " []\n"
          else
            yaml << "\n- " << v.map {|s| s.to_s.gsub(/\s+/, " ").inspect }.join("\n- ") << "\n"
          end
        else
          yaml << " " << v.to_s.gsub(/\s+/, " ").inspect << "\n"
        end
      end
      yaml
    end

ARRAY_REGEX = /
      ^
      (?:[ ]*-[ ]) # '- ' before array items
      (['"]?) # optional opening quote
      (.*) # value
      \1 # matching closing quote
      $
    /xo

HASH_REGEX = /
      ^
      ([ ]*) # indentations
      ([^#]+) # key excludes comment char '#'
      (?::(?=(?:\s|$))) # :  (without the lookahead the #key includes this when : is present in value)
      [ ]?
      (['"]?) # optional opening quote
      (.*) # value
      \3 # matching closing quote
      $
    /xo

def load(str)
      res = {}
      stack = [res]
      last_hash = nil
      last_empty_key = nil
      str.split(/\r?\n/) do |line|
        if match = HASH_REGEX.match(line)
          indent, key, quote, val = match.captures
          val = strip_comment(val)

depth = indent.size / 2
          if quote.empty? && val.empty?
            new_hash = {}
            stack[depth][key] = new_hash
            stack[depth + 1] = new_hash
            last_empty_key = key
            last_hash = stack[depth]
          else
            val = [] if val == "[]" # empty array
            stack[depth][key] = val
          end
        elsif match = ARRAY_REGEX.match(line)
          _, val = match.captures
          val = strip_comment(val)

last_hash[last_empty_key] = [] unless last_hash[last_empty_key].is_a?(Array)

last_hash[last_empty_key].push(val)
        end
      end
      res
    end

def strip_comment(val)
      if val.include?("#") && !val.start_with?("#")
        val.split("#", 2).first.strip
      else
        val
      end
    end

class << self
      private :dump_hash
    end
  end
end

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