Module: Parsr::Rules::Hash

Defined in:
lib/parsr/rules/hash.rb

Defined Under Namespace

Classes: MissingSeparator, MissingValue, Unterminated

Class Method Summary collapse

Class Method Details

.match(scanner, &block) ⇒ Object 



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# File 'lib/parsr/rules/hash.rb', line 17

def match(scanner, &block)
  if scanner.scan(/\{\s*/)
    hash = []
    while pair = parse_pair(scanner, &block)
      hash << pair
      break unless scanner.scan(/\s*\,\s*/)
    end
    raise Unterminated.new(scanner) unless scanner.scan(/\s*\}\s*/)
    Parsr::Token.new(Hash[hash])
  end
end

.parse_pair(scanner, key = nil) ⇒ Object

Raises:



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# File 'lib/parsr/rules/hash.rb', line 29

def parse_pair(scanner, key=nil)
  unless key.is_a?(Parsr::Token)
    if scanner.scan(/[a-zA-Z_][0-9a-zA-Z_]*\:/)
      key = Parsr::Token.new(scanner.matched.chomp(':').to_sym)
    elsif key = yield and key.is_a?(Parsr::Token)
      raise MissingSeparator.new(scanner) unless scanner.scan(/\s*=>\s*/)
    else
      return false
    end
  end
  value = yield
  raise MissingValue.new(scanner) unless value && value.is_a?(Parsr::Token)
  [key, value].map(&:value)
end