Class: PrisonParser::Utils::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/prison_parser/utils/parser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/prison_parser/utils/parser.rb', line 7

def initialize
  @tokens = []
end

Instance Attribute Details

#tokens ⇒ Object (readonly)

Returns the value of attribute tokens.



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# File 'lib/prison_parser/utils/parser.rb', line 5

def tokens
  @tokens
end

Instance Method Details

#load(filepath) ⇒ Object 



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# File 'lib/prison_parser/utils/parser.rb', line 11

def load(filepath)
  line_num = 0
  nodes = []
  @tokens = []
  currentNode = Prison.new

  file = File.open(filepath, "r")

  while !file.eof? do
    line = file.readline.strip
    line_num += 1
    tokenize(line)

    next if tokens.size == 0

    # start a new node
    if "BEGIN" == tokens[0]
      nodes.push(currentNode)

      label = tokens[1]
      currentNode = currentNode.create_node(label)

      if tokens.size > 2
        # inline node
        if tokens.size % 2 != 1
          raise "Unexpected number of tokens in an inline node definition on line #{line_num}"
        end

        unless "END" == tokens[tokens.size - 1]
          raise "Unexpected end of inline node definition on line #{line_num}"
        end
        
        tokens.each_slice(2) do |parts|
          # the first one is bogus :/
          currentNode.add_property(parts[0], parts[1])
        end
        
        upperNode = nodes.pop
        upperNode.finished_reading_node(currentNode)
        currentNode = upperNode
      else
        currentNode.allow_inline = false
      end
    elsif "END" == tokens[0]
      # end of multi-line section
      upperNode = nodes.pop
      upperNode.finished_reading_node(currentNode)
      currentNode = upperNode
    else
      # inside a multi-line section
      currentNode.add_property(tokens[0], tokens[1])
    end
  end

  if nodes.size != 0
    raise "Unexpected end of file!"
  end

  currentNode
end

#tokenize(line) ⇒ Object

Splits a line into a series of tokens



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# File 'lib/prison_parser/utils/parser.rb', line 73

def tokenize(line)
  return if line.size == 0
  
  @tokens.clear
  
  token_start = 0
  i = 0
  chars = line.chars

  while i < line.size do
    c = chars[i]
    if c == ' '
      # eat the spaces!
      if token_start != i
        @tokens << line[token_start, i - token_start]
      end
      token_start = i + 1
    elsif c == '"'
      # skip ahead to the next quote
      end_quotes = line.index('"', i + 1)

      end_quotes = -1 if end_quotes.nil?

      @tokens << line[i + 1, end_quotes - i - 1]
      i = end_quotes
      token_start = i + 1
    else
      # skip ahead to the next space
      next_space = line.index(' ', i)
      next_space = -1 if next_space.nil?
      i = next_space - 1
      break if (i < 0)
    end
    i += 1
  end
  
  if token_start < line.size
    # append the remainder of the string, after we ran out of spaces
    @tokens << line[token_start, line.size - token_start]
  end

  return @tokens
end