Class: Rox::Core::TokenizedExpression

Inherits:
Object
  • Object
show all
Defined in:
lib/rox/core/roxx/tokenized_expression.rb

Constant Summary collapse

DICT_START_DELIMITER = 
'{'.freeze
DICT_END_DELIMITER = 
'}'.freeze
ARRAY_START_DELIMITER = 
'['.freeze
ARRAY_END_DELIMITER = 
']'.freeze
TOKEN_DELIMITERS = 
"{}[]():, \t\r\n\"".freeze
PRE_POST_STRING_CHAR = 
''.freeze
STRING_DELIMITER = 
'"'.freeze
ESCAPED_QUOTE = 
'\\"'.freeze
ESCAPED_QUOTE_PLACEHOLDER = 
'\\RO_Q'.freeze

Instance Method Summary collapse

Constructor Details

#initialize(expression, operators) ⇒ TokenizedExpression

Returns a new instance of TokenizedExpression.



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# File 'lib/rox/core/roxx/tokenized_expression.rb', line 19

def initialize(expression, operators)
  @expression = expression
  @operators = operators
  @result_list = nil
  @array_accumulator = nil
  @dict_accumulator = nil
  @dict_key = nil
end

Instance Method Details

#node_from_array(items) ⇒ Object 



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# File 'lib/rox/core/roxx/tokenized_expression.rb', line 91

def node_from_array(items)
  Node.new(NodeTypes::RAND, items)
end

#node_from_dict(items) ⇒ Object 



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# File 'lib/rox/core/roxx/tokenized_expression.rb', line 95

def node_from_dict(items)
  Node.new(NodeTypes::RAND, items)
end

#node_from_token(token) ⇒ Object 



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# File 'lib/rox/core/roxx/tokenized_expression.rb', line 99

def node_from_token(token)
  return Node.new(NodeTypes::RATOR, token) if @operators.include?(token)
  return Node.new(NodeTypes::RAND, true) if token == Symbols::ROXX_TRUE
  return Node.new(NodeTypes::RAND, false) if token == Symbols::ROXX_FALSE
  return Node.new(NodeTypes::RAND, TokenType::UNDEFINED) if token == Symbols::ROXX_UNDEFINED

  token_type = TokenType.from_token(token)
  return Node.new(NodeTypes::RAND, token[1...-2]) if token_type == TokenType::STRING

  if token_type == TokenType::NUMBER
    begin
      return Node.new(NodeTypes::RAND, Integer(token))
    rescue ArgumentError
      begin
        return Node.new(NodeTypes::RAND, Float(token))
      rescue ArgumentError => e
        raise ArgumentError, "Excepted Number, got '#{token}' (#{token_type}): #{e}"
      end
    end
  end
  Node.new(NodeTypes::UNKNOWN, nil)
end

#push_node(node) ⇒ Object 



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# File 'lib/rox/core/roxx/tokenized_expression.rb', line 32

def push_node(node)
  if !@dict_accumulator.nil? && @dict_key.nil?
    @dict_key = node.value.to_s
  elsif !@dict_accumulator.nil? && !@dict_key.nil?
    @dict_accumulator[@dict_key] = node.value
    @dict_key = nil
  elsif !@array_accumulator.nil?
    @array_accumulator << node.value
  else
    @result_list << node
  end
end

#tokenize(expression) ⇒ Object 



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# File 'lib/rox/core/roxx/tokenized_expression.rb', line 45

def tokenize(expression)
  @result_list = []
  @array_accumulator = nil
  @dict_accumulator = nil
  @dict_key = nil

  delimiters_to_use = TokenizedExpression::TOKEN_DELIMITERS
  normalized_expression = expression.gsub(TokenizedExpression::ESCAPED_QUOTE,
                                          TokenizedExpression::ESCAPED_QUOTE_PLACEHOLDER)
  tokenizer = StringTokenizer.new(normalized_expression, delimiters_to_use, true)

  token = nil
  while tokenizer.more_tokens?
    prev_token = token
    token = tokenizer.next_token(delimiters_to_use)
    in_string = delimiters_to_use == TokenizedExpression::STRING_DELIMITER

    if !in_string && token == TokenizedExpression::DICT_START_DELIMITER
      @dict_accumulator = {}
    elsif !in_string && token == TokenizedExpression::DICT_END_DELIMITER
      dict_result = @dict_accumulator
      @dict_accumulator = nil
      push_node(node_from_dict(dict_result))
    elsif !in_string && token == TokenizedExpression::ARRAY_START_DELIMITER
      @array_accumulator = []
    elsif !in_string && token == TokenizedExpression::ARRAY_END_DELIMITER
      array_result = @array_accumulator
      @array_accumulator = nil
      push_node(node_from_array(array_result))
    elsif token == TokenizedExpression::STRING_DELIMITER
      if prev_token == TokenizedExpression::STRING_DELIMITER
        push_node(node_from_token(Symbols::ROXX_EMPTY_STRING))
      end
      delimiters_to_use = in_string ? TokenizedExpression::TOKEN_DELIMITERS : TokenizedExpression::STRING_DELIMITER
    elsif delimiters_to_use == TokenizedExpression::STRING_DELIMITER
      push_node(Node.new(NodeTypes::RAND,
                         token.gsub(TokenizedExpression::ESCAPED_QUOTE_PLACEHOLDER,
                                    TokenizedExpression::ESCAPED_QUOTE)))
    elsif !TokenizedExpression::TOKEN_DELIMITERS.include?(token) && token != TokenizedExpression::PRE_POST_STRING_CHAR
      push_node(node_from_token(token))
    end
  end

  @result_list
end

#tokens ⇒ Object 



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# File 'lib/rox/core/roxx/tokenized_expression.rb', line 28

def tokens
  tokenize(@expression)
end