Class: EPUB::Parser::CFI

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
lib/epub/parser/cfi.rb

Constant Summary collapse

UNICODE_CHARACTER_EXCLUDING_SPECIAL_CHARS_AND_SPACE_AND_DOT_AND_COLON_AND_TILDE_AND_ATMARK_AND_SOLIDUS_AND_EXCLAMATION_MARK_PATTERN =

excluding special chars and space(u0020) and dot(u002E) and colon(u003A) and tilde(u007E) and atmark(u0040) and solidus(u002F) and exclamation mark(u0021)

/\u0009|\u000A|\u000D|[\u0022-\u0027]|[\u002A-\u002B]|\u002D|[\u0030-\u0039]|\u003C|[\u003E-\u0040]|[\u0041-\u005A]|\u005C|[\u005F-\u007D]|[\u007F-\uD7FF]|[\uE000-\uFFFD]|[\u10000-\u10FFFF]/
UNICODE_CHARACTER_PATTERN = 
Regexp.union(UNICODE_CHARACTER_EXCLUDING_SPECIAL_CHARS_AND_SPACE_AND_DOT_AND_COLON_AND_TILDE_AND_ATMARK_AND_SOLIDUS_AND_EXCLAMATION_MARK_PATTERN, Regexp.new(Regexp.escape(EPUB::CFI::SPECIAL_CHARS), / \.:~@!/))

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(debug: false) ⇒ CFI

Returns a new instance of CFI.



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# File 'lib/epub/parser/cfi.rb', line 19

def initialize(debug: false)
  @yydebug = debug
  super()
end

Class Method Details

.parse(string, debug: false) ⇒ Object 



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# File 'lib/epub/parser/cfi.rb', line 14

def parse(string, debug: false)
  new(debug: debug).parse(string)
end

Instance Method Details

#next_token ⇒ Object 



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# File 'lib/epub/parser/cfi.rb', line 77

def next_token
  @q.shift
end

#parse(string) ⇒ Object 



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# File 'lib/epub/parser/cfi.rb', line 24

def parse(string)
  if string.start_with? 'epubcfi('
    string = string['epubcfi('.length .. -2]
  end
  @scanner = StringScanner.new(string, true)
  @q = []
  until @scanner.eos?
    case
    when @scanner.scan(/[1-9]/)
      @q << [:DIGIT_NON_ZERO, @scanner[0]]
    when @scanner.scan(/0/)
      @q << [:ZERO, @scanner[0]]
    when @scanner.scan(/ /)
      @q << [:SPACE, @scanner[0]]
    when @scanner.scan(/\^/)
      @q << [:CIRCUMFLEX, @scanner[0]]
    when @scanner.scan(/\[/)
      @q << [:OPENING_SQUARE_BRACKET, @scanner[0]]
    when @scanner.scan(/\]/)
      @q << [:CLOSING_SQUARE_BRACKET, @scanner[0]]
    when @scanner.scan(/\(/)
      @q << [:OPENING_PARENTHESIS, @scanner[0]]
    when @scanner.scan(/\)/)
      @q << [:CLOSING_PARENTHESIS, @scanner[0]]
    when @scanner.scan(/,/)
      @q << [:COMMA, @scanner[0]]
    when @scanner.scan(/;/)
      @q << [:SEMICOLON, @scanner[0]]
    when @scanner.scan(/=/)
      @q << [:EQUAL, @scanner[0]]
    when @scanner.scan(/\./)
      @q << [:DOT, @scanner[0]]
    when @scanner.scan(/:/)
      @q << [:COLON, @scanner[0]]
    when @scanner.scan(/~/)
      @q << [:TILDE, @scanner[0]]
    when @scanner.scan(/@/)
      @q << [:ATMARK, @scanner[0]]
    when @scanner.scan(/\//)
      @q << [:SOLIDUS, @scanner[0]]
    when @scanner.scan(/!/)
      @q << [:EXCLAMATION_MARK, @scanner[0]]
    when @scanner.scan(UNICODE_CHARACTER_EXCLUDING_SPECIAL_CHARS_AND_SPACE_AND_DOT_AND_COLON_AND_TILDE_AND_ATMARK_AND_SOLIDUS_AND_EXCLAMATION_MARK_PATTERN)
      @q << [:UNICODE_CHARACTER_EXCLUDING_SPECIAL_CHARS_AND_SPACE_AND_DOT_AND_COLON_AND_TILDE_AND_ATMARK_AND_SOLIDUS_AND_EXCLAMATION_MARK, @scanner[0]]
    else
      raise 'unexpected character'
    end
  end
  @q << [false, false]

  do_parse
end