Class: PropertyList::AsciiParser

Inherits:
Object
  • Object
show all
Defined in:
lib/property-list/ascii_parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(src) ⇒ AsciiParser

Returns a new instance of AsciiParser.



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# File 'lib/property-list/ascii_parser.rb', line 7

def initialize src
  @lexer = StringScanner.new src.strip
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 11

def parse
  res = parse_object
  skip_space_and_comment
  if !@lexer.eos? or res.nil?
    syntax_error "Unrecognized token"
  end
  res
end

#parse_array ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 90

def parse_array
  @lexer.pos += 1
  array = []
  while (skip_space_and_comment; @lexer.peek(1) != ')')
    obj = parse_object
    if obj.nil?
      syntax_error "Failed to parse array element"
    end
    array << obj
    skip_space_and_comment
    @lexer.scan(/,/)
  end
  if @lexer.getch != ')'
    syntax_error "Unclosed array"
  end
  array
end

#parse_data ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 200

def parse_data
  if (h = @lexer.scan /[0-9a-f\s]*\>/i)
    h = h.gsub /[\s\>]/, ''
    data = [h].pack 'H*'
    StringIO.new data
  else
    syntax_error "Expect hex value"
  end
end

#parse_dict ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 48

def parse_dict
  @lexer.pos += 1
  hash = {}
  while (skip_space_and_comment; @lexer.peek(1) != '}')
    k = \
      case @lexer.peek(1)
      when '"'
        parse_string '"'
      when "'"
        parse_string "'"
      when /\w/
        parse_unquoted_string
      end
    if !k
      syntax_error "Expect dictionary key"
    end

    skip_space_and_comment
    if !@lexer.scan(/=/)
      syntax_error "Expect '=' after dictionary key"
    end
    skip_space_and_comment

    v = parse_object
    if v.nil?
      syntax_error "Expect dictionary value"
    end

    skip_space_and_comment
    if !@lexer.scan(/;/)
      syntax_error "Expect ';' after dictionary value"
    end
    skip_space_and_comment

    hash[k] = v
  end
  if @lexer.getch != '}'
    syntax_error "Unclosed hash"
  end
  hash
end

#parse_extension_value ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 156

def parse_extension_value
  @lexer.pos += 1

  case @lexer.peek(2)
  when '*D' # date
    @lexer.pos += 2
    if (d = @lexer.scan /\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2} [+\-]\d{4}\>/)
      Date.strptime d.chop, "%Y-%m-%d %H:%M:%S %z"
    else
      syntax_error "Expect date value"
    end

  when '*I' # integer
    @lexer.pos += 2
    if (i = @lexer.scan /[\+\-]?\d+\>/)
      i.chop.to_i
    else
      syntax_error "Expect integer value"
    end

  when '*R' # real
    @lexer.pos += 2
    if (r = @lexer.scan /[\+\-]?\d+(\.\d+)?([eE][\+\-]?\d+)?\>/)
      r.chop.to_f
    else
      syntax_error "Expect real value"
    end

  when '*B' # boolean
    @lexer.pos += 2
    case @lexer.scan(/[YN]\>/)
    when 'Y>'
      true
    when 'N>'
      false
    else
      syntax_error "Expect boolean value"
    end

  else
    parse_data
  end
end

#parse_object ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 30

def parse_object
  skip_space_and_comment
  case @lexer.peek(1)
  when '{'
    parse_dict
  when '('
    parse_array
  when '"'
    parse_string '"'
  when "'"
    parse_string "'" # NOTE: not in GNU extension
  when '<'
    parse_extension_value
  when /[\w\.\/]/
    parse_unquoted_string
  end
end

#parse_string(delim) ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 108

def parse_string delim
  @lexer.pos += 1

  # TODO (TextMate only, xcode cannot parse it) when delim is ', '' is the escape

  chars = []
  while (ch = @lexer.getch) != delim
    case ch
    when '\\'
      case @lexer.getch
      when '\\'
        chars << '\\'
      when '"'
        chars << '"'
      when "'"
        chars << "'"
      when 'b'
        chars << "\b"
      when 'n'
        chars << "\n"
      when 'r'
        chars << "\r"
      when 't'
        chars << "\t"
      when 'U'
        if (hex = @lexer.scan /[0-9a-h]{4}/i)
          chars << [hex].pack('U')
        else
          syntax_error "Expect 4 digit hex code"
        end
      else
        if (oct = @lexer.scan /[0-7]{3}/)
          chars << [oct.to_i(8)].pack('U')
        else
          syntax_error "Expect 3 digit oct code"
        end
      end
    else
      chars << ch
    end
  end
  chars.join
end

#parse_unquoted_string ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 152

def parse_unquoted_string
  @lexer.scan /[\w\.\/]+/
end

#skip_space_and_comment ⇒ Object 



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# File 'lib/property-list/ascii_parser.rb', line 20

def skip_space_and_comment
  @lexer.skip(%r{(?:
    [\x0A\x0D\u2028\u2029\x09\x0B\x0C\x20]+ # newline and space
    |
    //[^\x0A\x0D\u2028\u2029]* # one-line comment
    |
    /\*(?:.*?)\*/ # multi-line comment
  )+}mx)
end

#syntax_error(msg) ⇒ Object

Raises:



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# File 'lib/property-list/ascii_parser.rb', line 210

def syntax_error msg
  pre = @lexer.string[0...@lexer.pos]
  line = pre.count("\n") + 1
  col = pre.size - pre.rindex("\n")
  raise SyntaxError, msg + " at line: #{line} col: #{col} #{@lexer.inspect}", caller
end