Module: Scrolls::Parser

Extended by:
Parser
Included in:
Parser
Defined in:
lib/scrolls/parser.rb

Instance Method Summary collapse

Instance Method Details

#parse(data) ⇒ Object 



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# File 'lib/scrolls/parser.rb', line 39

def parse(data)
  vals = {}
  str = data.dup if data.is_a?(String)

  patterns = [
    /([^= ]+)="((?:\\.|[^"\\])*)"/, # key="\"literal\" escaped val"
    /([^= ]+)='((?:\\.|[^'\\])*)'/, # key='\'literal\' escaped val'
    /([^= ]+)=([^ =]+)/             # key=value
  ]

  patterns.each do |pattern|
    str.scan(pattern) do |match|
      v = match[1]
      v.gsub!(/\\"/, '"')                # unescape \"
      v.gsub!(/\\\\/, "\\")              # unescape \\

      if v.to_i.to_s == v                # cast value to int or float
        v = v.to_i
      elsif format("%.3f", v.to_f) == v
        v = v.to_f
      elsif v == "false"
        v = false
      elsif v == "true"
        v = true
      else
        begin
          v = Time.iso8601(v)
        rescue ArgumentError
        end
      end

      vals[match[0]] = v
    end
    # sub value, leaving keys in order
    str.gsub!(pattern, "\\1")
  end

  # rebuild in-order key: value hash
  str.split.inject({}) do |h,k|
    h[k.to_sym] = vals[k]
    h
  end
end

#unparse(data, escape_keys = false) ⇒ Object 



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# File 'lib/scrolls/parser.rb', line 7

def unparse(data, escape_keys=false)
  data.map do |(k,v)|
    k = Scrolls::Utils.escape_chars(k) if escape_keys

    if (v == true)
      "#{k}=true"
    elsif (v == false)
      "#{k}=false"
    elsif v.is_a?(Float)
      "#{k}=#{format("%.3f", v)}"
    elsif v.nil?
      "#{k}=nil"
    elsif v.is_a?(Time)
      "#{k}=\"#{v.iso8601}\""
    else
      v = v.to_s
      has_single_quote = v.index("'")
      has_double_quote = v.index('"')
      if v =~ /[ =:,]/
        if has_single_quote && has_double_quote
          v = '"' + v.gsub(/\\|"/) { |c| "\\#{c}" } + '"'
        elsif has_double_quote
          v = "'" + v.gsub('\\', '\\\\\\') + "'"
        else
          v = '"' + v.gsub('\\', '\\\\\\') + '"'
        end
      end
      "#{k}=#{v}"
    end
  end.compact.join(" ")
end