Module: ZergXcode::Lexer

Defined in:
lib/zerg_xcode/file_format/lexer.rb

Class Method Summary collapse

Class Method Details

.tokenize(string) ⇒ Object 



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# File 'lib/zerg_xcode/file_format/lexer.rb', line 2

def self.tokenize(string)
  
  encoding_match = string.match(/^\/\/ \!\$\*(.*?)\*\$\!/)
  raise "No encoding - #{string[0, 20]}" unless encoding_match
  
  i = encoding_match[0].length
  tokens = [[:encoding, encoding_match[1]]]
  while i < string.length
    # skip comments
    if string[i, 2] == '/*'
      i += 2
      i += 1 while string[i, 2] != '*/'
      i += 2
      next
    end
    
    case string[i, 1]
    when /\s/
      i += 1
    when '(', ')', '{', '}', '=', ';', ','
      tokens << {'(' => :begin_array, ')' => :end_array,
                 '{' => :begin_hash, '}' => :end_hash,
                 '=' => :assign, ';' => :stop, ',' => :comma}[string[i, 1]]
      i += 1
    when '"'
      # string
      i += 1
      token = ''
      while string[i, 1] != '"'
        if string[i, 1] == '\\'
          i += 1
          case string[i, 1]            
          when 'n', 'r', 't'
            token << { 'n' => "\n", 't' => "\t", 'r' => "\r" }[string[i, 1]]
            i += 1 
          when '"', "'", '\\'
            token << string[i]
            i += 1
          else
            raise "Uknown escape sequence \\#{string[i, 20]}"
          end
        else
          token << string[i]
          i += 1
        end
      end
      tokens << [:string, token]
      i += 1
    else
      # something
      len = 0
      len += 1 while /[^\s\t\r\n\f(){}=;,]/ =~ string[i + len, 1]
      tokens << [:symbol, string[i, len]]
      i += len
    end
  end
  return tokens
end